aufs: remove support, we need a maintainer for this external patch, anyone?

6 files changed, 0 insertions, 35618 deletions

diff --git a/package/aufs-util/Makefile b/package/aufs-util/Makefile
deleted file mode 100644
index a31562175..000000000
--- a/package/aufs-util/Makefile
+++ /dev/null
@@ -1,45 +0,0 @@
-# This file is part of the OpenADK project. OpenADK is copyrighted
-# material, please see the LICENCE file in the top-level directory.
-
-include $(ADK_TOPDIR)/rules.mk
-
-PKG_NAME:=		aufs-util
-# branch aufs4.0
-PKG_VERSION:=		5e0c348bd8b1898beb1e043b026bcb0e0c7b0d54
-PKG_GIT:=		hash
-PKG_RELEASE:=		1
-PKG_DESCR:=		aufs utilities (version 3 and above)
-PKG_SECTION:=		sys/fs
-PKG_URL:=		http://aufs.sf.net/
-PKG_SITES:=		git://git.code.sf.net/p/aufs/aufs-util
-
-PKG_SUBPKGS:=		AUFS_UTIL LIBAU
-PKGSD_LIBAU:=		aufs userspace library
-PKGSC_LIBAU:=		libs/misc
-
-include $(ADK_TOPDIR)/mk/package.mk
-
-$(eval $(call PKG_template,AUFS_UTIL,$(PKG_NAME),$(PKG_VERSION)-$(PKG_RELEASE),$(PKG_DEPENDS),$(PKG_DESCR),$(PKG_SECTION)))
-$(eval $(call PKG_template,LIBAU,libau,$(PKG_VERSION)-$(PKG_RELEASE),$(PKG_DEPENDS),$(PKGSD_LIBAU),$(PKGSC_LIBAU)))
-
-CONFIG_STYLE:=		manual
-XAKE_FLAGS+=		Install=install \
-			HOSTCC="$(HOST_CC)" \
-			CPPFLAGS_FOR_BUILD="-I$(STAGING_TARGET_DIR)/usr/include -I./libau"
-
-aufs-util-install:
-	$(INSTALL_DIR) $(IDIR_AUFS_UTIL)/sbin
-	$(INSTALL_BIN) $(WRKINST)/sbin/{{u,}mount.aufs,auplink} \
-		$(IDIR_AUFS_UTIL)/sbin
-	$(INSTALL_DIR) $(IDIR_AUFS_UTIL)/usr/bin
-	$(INSTALL_BIN) $(WRKINST)/usr/bin/au{brsync,chk} \
-		$(IDIR_AUFS_UTIL)/usr/bin
-	$(INSTALL_DIR) $(IDIR_AUFS_UTIL)/etc/default
-	$(INSTALL_DATA) $(WRKINST)/etc/default/aufs \
-		$(IDIR_AUFS_UTIL)/etc/default
-
-libau-install:
-	$(INSTALL_DIR) $(IDIR_LIBAU)/usr/lib
-	$(CP) $(WRKINST)/usr/lib/libau* $(IDIR_LIBAU)/usr/lib
-
-include $(ADK_TOPDIR)/mk/pkg-bottom.mk
diff --git a/package/aufs-util/patches/patch-Makefile b/package/aufs-util/patches/patch-Makefile
deleted file mode 100644
index 0253076f1..000000000
--- a/package/aufs-util/patches/patch-Makefile
+++ /dev/null
@@ -1,23 +0,0 @@
-	- Ensure correct (HOST-)FLAGS when compiling the intermediates
-	- Drop version test, this cant work anyway since there is no aufs3.12 branch anywhere
---- w-aufs-util-3.x-rcN-050614-1.orig/Makefile	2014-05-06 15:36:53.000000000 +0200
-+++ w-aufs-util-3.x-rcN-050614-1/Makefile	2014-06-05 14:32:53.496611173 +0200
-@@ -49,7 +49,7 @@ LibUtilObj = perror.o proc_mnt.o br.o pl
- LibUtilHdr = au_util.h
- export
- 
--all: ver_test ${Man} ${Bin} ${Etc}
-+all: ${Man} ${Bin} ${Etc}
- 	${MAKE} -C libau $@
- 	ln -sf ./libau/libau*.so .
- 
-@@ -85,6 +85,9 @@ aufs.5: aufs.in.5 c2tmac
- 	chmod a-w $@
- 
- c2sh c2tmac ver: CC = ${HOSTCC}
-+c2sh c2tmac ver: CFLAGS = ${CFLAGS_FOR_BUILD}
-+c2sh c2tmac ver: LDFLAGS = ${LDFLAGS_FOR_BUILD}
-+c2sh c2tmac ver: CPPFLAGS = ${CPPFLAGS_FOR_BUILD}
- .INTERMEDIATE: c2sh c2tmac ver
- 
- Install = install -o root -g root -p
diff --git a/target/linux/config/Config.in.aufs b/target/linux/config/Config.in.aufs
deleted file mode 100644
index 9c65d37f4..000000000
--- a/target/linux/config/Config.in.aufs
+++ /dev/null
@@ -1,96 +0,0 @@
-# This file is part of the OpenADK project. OpenADK is copyrighted
-# material, please see the LICENCE file in the top-level directory.
-
-menu "Overlay filesystems"
-
-config ADK_KERNEL_AUFS_FS
-	bool "Aufs (Advanced multi layered unification filesystem) support"
-	help
-	  Aufs is a stackable unification filesystem such as Unionfs,
-	  which unifies several directories and provides a merged single
-	  directory.
-	  In the early days, aufs was entirely re-designed and
-	  re-implemented Unionfs Version 1.x series. Introducing many
-	  original ideas, approaches and improvements, it becomes totally
-	  different from Unionfs while keeping the basic features.
-
-if ADK_KERNEL_AUFS_FS
-
-choice 
-	bool "Maximum number of branches"
-	default ADK_KERNEL_AUFS_BRANCH_MAX_127
-	help
-	  Specifies the maximum number of branches (or member directories)
-	  in a single aufs. The larger value consumes more system
-	  resources and has a minor impact to performance.
-
-config ADK_KERNEL_AUFS_BRANCH_MAX_127
-	bool "127"
-
-config ADK_KERNEL_AUFS_BRANCH_MAX_511
-	bool "511"
-
-config ADK_KERNEL_AUFS_BRANCH_MAX_1023
-	bool "1023"
-
-config ADK_KERNEL_AUFS_BRANCH_MAX_32767
-	bool "32767"
-
-endchoice
-
-config ADK_KERNEL_AUFS_HINOTIFY
-	bool "Use inotify to detect actions on a branch"
-	help
-	 If you want to modify files on branches directly, eg. bypassing aufs,
-	 and want aufs to detect the changes of them fully, then enable this
-	 option and use 'udba=inotify' mount option.
-	 It will have a negative impact to the performance.
-	 See detail in aufs.5.
-
-config ADK_KERNEL_AUFS_EXPORT
-	bool "NFS-exportable aufs"
-	select ADK_KERNEL_EXPORTFS
-	help
-	  If you want to export your mounted aufs via NFS, then enable this
-	  option. There are several requirements for this configuration.
-	  See detail in aufs.5.
-
-config ADK_KERNEL_AUFS_SHWH
-	bool "Show whiteouts"
-	help
-	  If you want to make the whiteouts in aufs visible, then enable
-	  this option and specify 'shwh' mount option. Although it may
-	  sounds like philosophy or something, but in technically it
-	  simply shows the name of whiteout with keeping its behaviour.
-
-config ADK_KERNEL_AUFS_BR_RAMFS
-	bool "Ramfs (initramfs/rootfs) as an aufs branch"
-	help
-	  If you want to use ramfs as an aufs branch fs, then enable this
-	  Generally tmpfs is recommended.
-	  hibited them to be a branch fs by default, because
-	  s becomes unusable after switch_root or something
-	  y. If you sets initramfs as an aufs branch and boot your
-	  y switch_root, you will meet a problem easily since the
-	   initramfs may be inaccessible.
-	  ou are going to use ramfs as an aufs branch fs without
-	  oot or something, leave it N.
-
-config ADK_KERNEL_AUFS_BR_FUSE
-	bool "Fuse fs as an aufs branch"
-	select ADK_KERNEL_AUFS_POLL
-	select ADK_KERNEL_FUSE_FS
-	help
-	  If you want to use fuse-based userspace filesystem as an aufs
-	  branch fs, then enable this option.
-	  It implements the internal poll(2) operation which is
-	  implemented by fuse only (curretnly).
-
-#config ADK_KERNEL_AUFS_DEBUG
-#	bool "Debug aufs"
-#	help
-#	  Enable this to compile aufs internal debug code.
-#	  It will have a negative impact to the performance.
-
-endif
-endmenu
diff --git a/target/linux/config/Config.in.fs b/target/linux/config/Config.in.fs
index 71b6ce7fb..622a65363 100644
--- a/target/linux/config/Config.in.fs
+++ b/target/linux/config/Config.in.fs
@@ -263,6 +263,5 @@ endmenu
 source target/linux/config/Config.in.part
 source target/linux/config/Config.in.fsnet
 source target/linux/config/Config.in.nls
-source target/linux/config/Config.in.aufs
 
 endmenu
diff --git a/target/linux/patches/3.4.112/aufs2.patch b/target/linux/patches/3.4.112/aufs2.patch
deleted file mode 100644
index d40c9a3fe..000000000
--- a/target/linux/patches/3.4.112/aufs2.patch
+++ /dev/null
@@ -1,238 +0,0 @@
-diff -Nur linux-3.1.4.orig/include/linux/Kbuild linux-3.1.4/include/linux/Kbuild
---- linux-3.1.4.orig/include/linux/Kbuild	2011-11-28 23:48:14.000000000 +0100
-+++ linux-3.1.4/include/linux/Kbuild	2011-12-01 12:44:17.000000000 +0100
-@@ -65,6 +65,7 @@
- header-y += atmsap.h
- header-y += atmsvc.h
- header-y += audit.h
-+header-y += aufs_type.h
- header-y += auto_fs.h
- header-y += auto_fs4.h
- header-y += auxvec.h
-diff -Nur linux-3.1.4.orig/include/linux/aufs_type.h linux-3.1.4/include/linux/aufs_type.h
---- linux-3.1.4.orig/include/linux/aufs_type.h	1970-01-01 01:00:00.000000000 +0100
-+++ linux-3.1.4/include/linux/aufs_type.h	2011-12-01 12:44:17.000000000 +0100
-@@ -0,0 +1,197 @@
-+/*
-+ * Copyright (C) 2005-2011 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program; if not, write to the Free Software
-+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
-+ */
-+
-+#ifndef __AUFS_TYPE_H__
-+#define __AUFS_TYPE_H__
-+
-+#include <linux/ioctl.h>
-+#include <linux/kernel.h>
-+#include <linux/limits.h>
-+#include <linux/types.h>
-+
-+#define AUFS_VERSION	"2.1-standalone.tree-36-20110110"
-+
-+/* todo? move this to linux-2.6.19/include/magic.h */
-+#define AUFS_SUPER_MAGIC	('a' << 24 | 'u' << 16 | 'f' << 8 | 's')
-+
-+/* ---------------------------------------------------------------------- */
-+
-+#ifdef CONFIG_AUFS_BRANCH_MAX_127
-+typedef __s8 aufs_bindex_t;
-+#define AUFS_BRANCH_MAX 127
-+#else
-+typedef __s16 aufs_bindex_t;
-+#ifdef CONFIG_AUFS_BRANCH_MAX_511
-+#define AUFS_BRANCH_MAX 511
-+#elif defined(CONFIG_AUFS_BRANCH_MAX_1023)
-+#define AUFS_BRANCH_MAX 1023
-+#elif defined(CONFIG_AUFS_BRANCH_MAX_32767)
-+#define AUFS_BRANCH_MAX 32767
-+#endif
-+#endif
-+
-+#ifdef __KERNEL__
-+#ifndef AUFS_BRANCH_MAX
-+#error unknown CONFIG_AUFS_BRANCH_MAX value
-+#endif
-+#endif /* __KERNEL__ */
-+
-+/* ---------------------------------------------------------------------- */
-+
-+#define AUFS_NAME		"aufs"
-+#define AUFS_FSTYPE		AUFS_NAME
-+
-+#define AUFS_ROOT_INO		2
-+#define AUFS_FIRST_INO		11
-+
-+#define AUFS_WH_PFX		".wh."
-+#define AUFS_WH_PFX_LEN		((int)sizeof(AUFS_WH_PFX) - 1)
-+#define AUFS_WH_TMP_LEN		4
-+/* a limit for rmdir/rename a dir */
-+#define AUFS_MAX_NAMELEN	(NAME_MAX \
-+				- AUFS_WH_PFX_LEN * 2	/* doubly whiteouted */\
-+				- 1			/* dot */\
-+				- AUFS_WH_TMP_LEN)	/* hex */
-+#define AUFS_XINO_FNAME		"." AUFS_NAME ".xino"
-+#define AUFS_XINO_DEFPATH	"/tmp/" AUFS_XINO_FNAME
-+#define AUFS_XINO_TRUNC_INIT	64 /* blocks */
-+#define AUFS_XINO_TRUNC_STEP	4  /* blocks */
-+#define AUFS_DIRWH_DEF		3
-+#define AUFS_RDCACHE_DEF	10 /* seconds */
-+#define AUFS_RDCACHE_MAX	3600 /* seconds */
-+#define AUFS_RDBLK_DEF		512 /* bytes */
-+#define AUFS_RDHASH_DEF		32
-+#define AUFS_WKQ_NAME		AUFS_NAME "d"
-+#define AUFS_WKQ_PRE_NAME	AUFS_WKQ_NAME "_pre"
-+#define AUFS_MFS_DEF_SEC	30 /* seconds */
-+#define AUFS_MFS_MAX_SEC	3600 /* seconds */
-+#define AUFS_PLINK_WARN		100 /* number of plinks */
-+
-+/* pseudo-link maintenace under /proc */
-+#define AUFS_PLINK_MAINT_NAME	"plink_maint"
-+#define AUFS_PLINK_MAINT_DIR	"fs/" AUFS_NAME
-+#define AUFS_PLINK_MAINT_PATH	AUFS_PLINK_MAINT_DIR "/" AUFS_PLINK_MAINT_NAME
-+
-+#define AUFS_DIROPQ_NAME	AUFS_WH_PFX ".opq" /* whiteouted doubly */
-+#define AUFS_WH_DIROPQ		AUFS_WH_PFX AUFS_DIROPQ_NAME
-+
-+#define AUFS_BASE_NAME		AUFS_WH_PFX AUFS_NAME
-+#define AUFS_PLINKDIR_NAME	AUFS_WH_PFX "plnk"
-+#define AUFS_ORPHDIR_NAME	AUFS_WH_PFX "orph"
-+
-+/* doubly whiteouted */
-+#define AUFS_WH_BASE		AUFS_WH_PFX AUFS_BASE_NAME
-+#define AUFS_WH_PLINKDIR	AUFS_WH_PFX AUFS_PLINKDIR_NAME
-+#define AUFS_WH_ORPHDIR		AUFS_WH_PFX AUFS_ORPHDIR_NAME
-+
-+/* branch permission */
-+#define AUFS_BRPERM_RW		"rw"
-+#define AUFS_BRPERM_RO		"ro"
-+#define AUFS_BRPERM_RR		"rr"
-+#define AUFS_BRPERM_WH		"wh"
-+#define AUFS_BRPERM_NLWH	"nolwh"
-+#define AUFS_BRPERM_ROWH	AUFS_BRPERM_RO "+" AUFS_BRPERM_WH
-+#define AUFS_BRPERM_RRWH	AUFS_BRPERM_RR "+" AUFS_BRPERM_WH
-+#define AUFS_BRPERM_RWNLWH	AUFS_BRPERM_RW "+" AUFS_BRPERM_NLWH
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* ioctl */
-+enum {
-+	/* readdir in userspace */
-+	AuCtl_RDU,
-+	AuCtl_RDU_INO,
-+
-+	/* pathconf wrapper */
-+	AuCtl_WBR_FD
-+};
-+
-+/* borrowed from linux/include/linux/kernel.h */
-+#ifndef ALIGN
-+#define ALIGN(x, a)		__ALIGN_MASK(x, (typeof(x))(a)-1)
-+#define __ALIGN_MASK(x, mask)	(((x)+(mask))&~(mask))
-+#endif
-+
-+/* borrowed from linux/include/linux/compiler-gcc3.h */
-+#ifndef __aligned
-+#define __aligned(x)			__attribute__((aligned(x)))
-+#define __packed			__attribute__((packed))
-+#endif
-+
-+struct au_rdu_cookie {
-+	__u64		h_pos;
-+	__s16		bindex;
-+	__u8		flags;
-+	__u8		pad;
-+	__u32		generation;
-+} __aligned(8);
-+
-+struct au_rdu_ent {
-+	__u64		ino;
-+	__s16		bindex;
-+	__u8		type;
-+	__u8		nlen;
-+	__u8		wh;
-+	char		name[0];
-+} __aligned(8);
-+
-+static inline int au_rdu_len(int nlen)
-+{
-+	/* include the terminating NULL */
-+	return ALIGN(sizeof(struct au_rdu_ent) + nlen + 1,
-+		     sizeof(__u64));
-+}
-+
-+union au_rdu_ent_ul {
-+	struct au_rdu_ent __user	*e;
-+	__u64				ul;
-+};
-+
-+enum {
-+	AufsCtlRduV_SZ,
-+	AufsCtlRduV_End
-+};
-+
-+struct aufs_rdu {
-+	/* input */
-+	union {
-+		__u64		sz;	/* AuCtl_RDU */
-+		__u64		nent;	/* AuCtl_RDU_INO */
-+	};
-+	union au_rdu_ent_ul	ent;
-+	__u16			verify[AufsCtlRduV_End];
-+
-+	/* input/output */
-+	__u32			blk;
-+
-+	/* output */
-+	union au_rdu_ent_ul	tail;
-+	/* number of entries which were added in a single call */
-+	__u64			rent;
-+	__u8			full;
-+	__u8			shwh;
-+
-+	struct au_rdu_cookie	cookie;
-+} __aligned(8);
-+
-+#define AuCtlType		'A'
-+#define AUFS_CTL_RDU		_IOWR(AuCtlType, AuCtl_RDU, struct aufs_rdu)
-+#define AUFS_CTL_RDU_INO	_IOWR(AuCtlType, AuCtl_RDU_INO, struct aufs_rdu)
-+#define AUFS_CTL_WBR_FD		_IO(AuCtlType, AuCtl_WBR_FD)
-+
-+#endif /* __AUFS_TYPE_H__ */
-diff -Nur linux-3.1.4.orig/include/linux/namei.h linux-3.1.4/include/linux/namei.h
---- linux-3.1.4.orig/include/linux/namei.h	2011-11-28 23:48:14.000000000 +0100
-+++ linux-3.1.4/include/linux/namei.h	2011-12-01 12:44:17.000000000 +0100
-@@ -85,6 +85,9 @@
- extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry,
- 		int (*open)(struct inode *, struct file *));
- 
-+extern struct dentry *lookup_hash(struct nameidata *nd);
-+extern int __lookup_one_len(const char *name, struct qstr *this,
-+			    struct dentry *base, int len);
- extern struct dentry *lookup_one_len(const char *, struct dentry *, int);
- 
- extern int follow_down_one(struct path *);
-diff -Nur linux-3.1.4.orig/include/linux/splice.h linux-3.1.4/include/linux/splice.h
---- linux-3.1.4.orig/include/linux/splice.h	2011-11-28 23:48:14.000000000 +0100
-+++ linux-3.1.4/include/linux/splice.h	2011-12-01 12:45:51.000000000 +0100
-@@ -91,4 +91,9 @@
- extern void spd_release_page(struct splice_pipe_desc *, unsigned int);
- 
- extern const struct pipe_buf_operations page_cache_pipe_buf_ops;
-+extern long do_splice_from(struct pipe_inode_info *pipe, struct file *out,
-+			   loff_t *ppos, size_t len, unsigned int flags);
-+extern long do_splice_to(struct file *in, loff_t *ppos,
-+			 struct pipe_inode_info *pipe, size_t len,
-+			 unsigned int flags);
- #endif
diff --git a/target/linux/patches/4.1.30/aufs.patch b/target/linux/patches/4.1.30/aufs.patch
deleted file mode 100644
index 749c90989..000000000
--- a/target/linux/patches/4.1.30/aufs.patch
+++ /dev/null
@@ -1,35215 +0,0 @@
-diff -Nur linux-4.1.10.orig/Documentation/ABI/testing/debugfs-aufs linux-4.1.10/Documentation/ABI/testing/debugfs-aufs
---- linux-4.1.10.orig/Documentation/ABI/testing/debugfs-aufs	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/Documentation/ABI/testing/debugfs-aufs	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,50 @@
-+What:		/debug/aufs/si_<id>/
-+Date:		March 2009
-+Contact:	J. R. Okajima <hooanon05g@gmail.com>
-+Description:
-+		Under /debug/aufs, a directory named si_<id> is created
-+		per aufs mount, where <id> is a unique id generated
-+		internally.
-+
-+What:		/debug/aufs/si_<id>/plink
-+Date:		Apr 2013
-+Contact:	J. R. Okajima <hooanon05g@gmail.com>
-+Description:
-+		It has three lines and shows the information about the
-+		pseudo-link. The first line is a single number
-+		representing a number of buckets. The second line is a
-+		number of pseudo-links per buckets (separated by a
-+		blank). The last line is a single number representing a
-+		total number of psedo-links.
-+		When the aufs mount option 'noplink' is specified, it
-+		will show "1\n0\n0\n".
-+
-+What:		/debug/aufs/si_<id>/xib
-+Date:		March 2009
-+Contact:	J. R. Okajima <hooanon05g@gmail.com>
-+Description:
-+		It shows the consumed blocks by xib (External Inode Number
-+		Bitmap), its block size and file size.
-+		When the aufs mount option 'noxino' is specified, it
-+		will be empty. About XINO files, see the aufs manual.
-+
-+What:		/debug/aufs/si_<id>/xino0, xino1 ... xinoN
-+Date:		March 2009
-+Contact:	J. R. Okajima <hooanon05g@gmail.com>
-+Description:
-+		It shows the consumed blocks by xino (External Inode Number
-+		Translation Table), its link count, block size and file
-+		size.
-+		When the aufs mount option 'noxino' is specified, it
-+		will be empty. About XINO files, see the aufs manual.
-+
-+What:		/debug/aufs/si_<id>/xigen
-+Date:		March 2009
-+Contact:	J. R. Okajima <hooanon05g@gmail.com>
-+Description:
-+		It shows the consumed blocks by xigen (External Inode
-+		Generation Table), its block size and file size.
-+		If CONFIG_AUFS_EXPORT is disabled, this entry will not
-+		be created.
-+		When the aufs mount option 'noxino' is specified, it
-+		will be empty. About XINO files, see the aufs manual.
-diff -Nur linux-4.1.10.orig/Documentation/ABI/testing/sysfs-aufs linux-4.1.10/Documentation/ABI/testing/sysfs-aufs
---- linux-4.1.10.orig/Documentation/ABI/testing/sysfs-aufs	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/Documentation/ABI/testing/sysfs-aufs	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,31 @@
-+What:		/sys/fs/aufs/si_<id>/
-+Date:		March 2009
-+Contact:	J. R. Okajima <hooanon05g@gmail.com>
-+Description:
-+		Under /sys/fs/aufs, a directory named si_<id> is created
-+		per aufs mount, where <id> is a unique id generated
-+		internally.
-+
-+What:		/sys/fs/aufs/si_<id>/br0, br1 ... brN
-+Date:		March 2009
-+Contact:	J. R. Okajima <hooanon05g@gmail.com>
-+Description:
-+		It shows the abolute path of a member directory (which
-+		is called branch) in aufs, and its permission.
-+
-+What:		/sys/fs/aufs/si_<id>/brid0, brid1 ... bridN
-+Date:		July 2013
-+Contact:	J. R. Okajima <hooanon05g@gmail.com>
-+Description:
-+		It shows the id of a member directory (which is called
-+		branch) in aufs.
-+
-+What:		/sys/fs/aufs/si_<id>/xi_path
-+Date:		March 2009
-+Contact:	J. R. Okajima <hooanon05g@gmail.com>
-+Description:
-+		It shows the abolute path of XINO (External Inode Number
-+		Bitmap, Translation Table and Generation Table) file
-+		even if it is the default path.
-+		When the aufs mount option 'noxino' is specified, it
-+		will be empty. About XINO files, see the aufs manual.
-diff -Nur linux-4.1.10.orig/Documentation/filesystems/aufs/design/01intro.txt linux-4.1.10/Documentation/filesystems/aufs/design/01intro.txt
---- linux-4.1.10.orig/Documentation/filesystems/aufs/design/01intro.txt	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/Documentation/filesystems/aufs/design/01intro.txt	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,170 @@
-+
-+# Copyright (C) 2005-2015 Junjiro R. Okajima
-+# 
-+# This program is free software; you can redistribute it and/or modify
-+# it under the terms of the GNU General Public License as published by
-+# the Free Software Foundation; either version 2 of the License, or
-+# (at your option) any later version.
-+# 
-+# This program is distributed in the hope that it will be useful,
-+# but WITHOUT ANY WARRANTY; without even the implied warranty of
-+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+# GNU General Public License for more details.
-+# 
-+# You should have received a copy of the GNU General Public License
-+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+
-+Introduction
-+----------------------------------------
-+
-+aufs [ei ju: ef es] | [a u f s]
-+1. abbrev. for "advanced multi-layered unification filesystem".
-+2. abbrev. for "another unionfs".
-+3. abbrev. for "auf das" in German which means "on the" in English.
-+   Ex. "Butter aufs Brot"(G) means "butter onto bread"(E).
-+   But "Filesystem aufs Filesystem" is hard to understand.
-+
-+AUFS is a filesystem with features:
-+- multi layered stackable unification filesystem, the member directory
-+  is called as a branch.
-+- branch permission and attribute, 'readonly', 'real-readonly',
-+  'readwrite', 'whiteout-able', 'link-able whiteout', etc. and their
-+  combination.
-+- internal "file copy-on-write".
-+- logical deletion, whiteout.
-+- dynamic branch manipulation, adding, deleting and changing permission.
-+- allow bypassing aufs, user's direct branch access.
-+- external inode number translation table and bitmap which maintains the
-+  persistent aufs inode number.
-+- seekable directory, including NFS readdir.
-+- file mapping, mmap and sharing pages.
-+- pseudo-link, hardlink over branches.
-+- loopback mounted filesystem as a branch.
-+- several policies to select one among multiple writable branches.
-+- revert a single systemcall when an error occurs in aufs.
-+- and more...
-+
-+
-+Multi Layered Stackable Unification Filesystem
-+----------------------------------------------------------------------
-+Most people already knows what it is.
-+It is a filesystem which unifies several directories and provides a
-+merged single directory. When users access a file, the access will be
-+passed/re-directed/converted (sorry, I am not sure which English word is
-+correct) to the real file on the member filesystem. The member
-+filesystem is called 'lower filesystem' or 'branch' and has a mode
-+'readonly' and 'readwrite.' And the deletion for a file on the lower
-+readonly branch is handled by creating 'whiteout' on the upper writable
-+branch.
-+
-+On LKML, there have been discussions about UnionMount (Jan Blunck,
-+Bharata B Rao and Valerie Aurora) and Unionfs (Erez Zadok). They took
-+different approaches to implement the merged-view.
-+The former tries putting it into VFS, and the latter implements as a
-+separate filesystem.
-+(If I misunderstand about these implementations, please let me know and
-+I shall correct it. Because it is a long time ago when I read their
-+source files last time).
-+
-+UnionMount's approach will be able to small, but may be hard to share
-+branches between several UnionMount since the whiteout in it is
-+implemented in the inode on branch filesystem and always
-+shared. According to Bharata's post, readdir does not seems to be
-+finished yet.
-+There are several missing features known in this implementations such as
-+- for users, the inode number may change silently. eg. copy-up.
-+- link(2) may break by copy-up.
-+- read(2) may get an obsoleted filedata (fstat(2) too).
-+- fcntl(F_SETLK) may be broken by copy-up.
-+- unnecessary copy-up may happen, for example mmap(MAP_PRIVATE) after
-+  open(O_RDWR).
-+
-+In linux-3.18, "overlay" filesystem (formerly known as "overlayfs") was
-+merged into mainline. This is another implementation of UnionMount as a
-+separated filesystem. All the limitations and known problems which
-+UnionMount are equally inherited to "overlay" filesystem.
-+
-+Unionfs has a longer history. When I started implementing a stackable
-+filesystem (Aug 2005), it already existed. It has virtual super_block,
-+inode, dentry and file objects and they have an array pointing lower
-+same kind objects. After contributing many patches for Unionfs, I
-+re-started my project AUFS (Jun 2006).
-+
-+In AUFS, the structure of filesystem resembles to Unionfs, but I
-+implemented my own ideas, approaches and enhancements and it became
-+totally different one.
-+
-+Comparing DM snapshot and fs based implementation
-+- the number of bytes to be copied between devices is much smaller.
-+- the type of filesystem must be one and only.
-+- the fs must be writable, no readonly fs, even for the lower original
-+  device. so the compression fs will not be usable. but if we use
-+  loopback mount, we may address this issue.
-+  for instance,
-+	mount /cdrom/squashfs.img /sq
-+	losetup /sq/ext2.img
-+	losetup /somewhere/cow
-+	dmsetup "snapshot /dev/loop0 /dev/loop1 ..."
-+- it will be difficult (or needs more operations) to extract the
-+  difference between the original device and COW.
-+- DM snapshot-merge may help a lot when users try merging. in the
-+  fs-layer union, users will use rsync(1).
-+
-+You may want to read my old paper "Filesystems in LiveCD"
-+(http://aufs.sourceforge.net/aufs2/report/sq/sq.pdf).
-+
-+
-+Several characters/aspects/persona of aufs
-+----------------------------------------------------------------------
-+
-+Aufs has several characters, aspects or persona.
-+1. a filesystem, callee of VFS helper
-+2. sub-VFS, caller of VFS helper for branches
-+3. a virtual filesystem which maintains persistent inode number
-+4. reader/writer of files on branches such like an application
-+
-+1. Callee of VFS Helper
-+As an ordinary linux filesystem, aufs is a callee of VFS. For instance,
-+unlink(2) from an application reaches sys_unlink() kernel function and
-+then vfs_unlink() is called. vfs_unlink() is one of VFS helper and it
-+calls filesystem specific unlink operation. Actually aufs implements the
-+unlink operation but it behaves like a redirector.
-+
-+2. Caller of VFS Helper for Branches
-+aufs_unlink() passes the unlink request to the branch filesystem as if
-+it were called from VFS. So the called unlink operation of the branch
-+filesystem acts as usual. As a caller of VFS helper, aufs should handle
-+every necessary pre/post operation for the branch filesystem.
-+- acquire the lock for the parent dir on a branch
-+- lookup in a branch
-+- revalidate dentry on a branch
-+- mnt_want_write() for a branch
-+- vfs_unlink() for a branch
-+- mnt_drop_write() for a branch
-+- release the lock on a branch
-+
-+3. Persistent Inode Number
-+One of the most important issue for a filesystem is to maintain inode
-+numbers. This is particularly important to support exporting a
-+filesystem via NFS. Aufs is a virtual filesystem which doesn't have a
-+backend block device for its own. But some storage is necessary to
-+keep and maintain the inode numbers. It may be a large space and may not
-+suit to keep in memory. Aufs rents some space from its first writable
-+branch filesystem (by default) and creates file(s) on it. These files
-+are created by aufs internally and removed soon (currently) keeping
-+opened.
-+Note: Because these files are removed, they are totally gone after
-+      unmounting aufs. It means the inode numbers are not persistent
-+      across unmount or reboot. I have a plan to make them really
-+      persistent which will be important for aufs on NFS server.
-+
-+4. Read/Write Files Internally (copy-on-write)
-+Because a branch can be readonly, when you write a file on it, aufs will
-+"copy-up" it to the upper writable branch internally. And then write the
-+originally requested thing to the file. Generally kernel doesn't
-+open/read/write file actively. In aufs, even a single write may cause a
-+internal "file copy". This behaviour is very similar to cp(1) command.
-+
-+Some people may think it is better to pass such work to user space
-+helper, instead of doing in kernel space. Actually I am still thinking
-+about it. But currently I have implemented it in kernel space.
-diff -Nur linux-4.1.10.orig/Documentation/filesystems/aufs/design/02struct.txt linux-4.1.10/Documentation/filesystems/aufs/design/02struct.txt
---- linux-4.1.10.orig/Documentation/filesystems/aufs/design/02struct.txt	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/Documentation/filesystems/aufs/design/02struct.txt	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,258 @@
-+
-+# Copyright (C) 2005-2015 Junjiro R. Okajima
-+# 
-+# This program is free software; you can redistribute it and/or modify
-+# it under the terms of the GNU General Public License as published by
-+# the Free Software Foundation; either version 2 of the License, or
-+# (at your option) any later version.
-+# 
-+# This program is distributed in the hope that it will be useful,
-+# but WITHOUT ANY WARRANTY; without even the implied warranty of
-+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+# GNU General Public License for more details.
-+# 
-+# You should have received a copy of the GNU General Public License
-+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+
-+Basic Aufs Internal Structure
-+
-+Superblock/Inode/Dentry/File Objects
-+----------------------------------------------------------------------
-+As like an ordinary filesystem, aufs has its own
-+superblock/inode/dentry/file objects. All these objects have a
-+dynamically allocated array and store the same kind of pointers to the
-+lower filesystem, branch.
-+For example, when you build a union with one readwrite branch and one
-+readonly, mounted /au, /rw and /ro respectively.
-+- /au = /rw + /ro
-+- /ro/fileA exists but /rw/fileA
-+
-+Aufs lookup operation finds /ro/fileA and gets dentry for that. These
-+pointers are stored in a aufs dentry. The array in aufs dentry will be,
-+- [0] = NULL (because /rw/fileA doesn't exist)
-+- [1] = /ro/fileA
-+
-+This style of an array is essentially same to the aufs
-+superblock/inode/dentry/file objects.
-+
-+Because aufs supports manipulating branches, ie. add/delete/change
-+branches dynamically, these objects has its own generation. When
-+branches are changed, the generation in aufs superblock is
-+incremented. And a generation in other object are compared when it is
-+accessed. When a generation in other objects are obsoleted, aufs
-+refreshes the internal array.
-+
-+
-+Superblock
-+----------------------------------------------------------------------
-+Additionally aufs superblock has some data for policies to select one
-+among multiple writable branches, XIB files, pseudo-links and kobject.
-+See below in detail.
-+About the policies which supports copy-down a directory, see
-+wbr_policy.txt too.
-+
-+
-+Branch and XINO(External Inode Number Translation Table)
-+----------------------------------------------------------------------
-+Every branch has its own xino (external inode number translation table)
-+file. The xino file is created and unlinked by aufs internally. When two
-+members of a union exist on the same filesystem, they share the single
-+xino file.
-+The struct of a xino file is simple, just a sequence of aufs inode
-+numbers which is indexed by the lower inode number.
-+In the above sample, assume the inode number of /ro/fileA is i111 and
-+aufs assigns the inode number i999 for fileA. Then aufs writes 999 as
-+4(8) bytes at 111 * 4(8) bytes offset in the xino file.
-+
-+When the inode numbers are not contiguous, the xino file will be sparse
-+which has a hole in it and doesn't consume as much disk space as it
-+might appear. If your branch filesystem consumes disk space for such
-+holes, then you should specify 'xino=' option at mounting aufs.
-+
-+Aufs has a mount option to free the disk blocks for such holes in XINO
-+files on tmpfs or ramdisk. But it is not so effective actually. If you
-+meet a problem of disk shortage due to XINO files, then you should try
-+"tmpfs-ino.patch" (and "vfs-ino.patch" too) in aufs4-standalone.git.
-+The patch localizes the assignment inumbers per tmpfs-mount and avoid
-+the holes in XINO files.
-+
-+Also a writable branch has three kinds of "whiteout bases". All these
-+are existed when the branch is joined to aufs, and their names are
-+whiteout-ed doubly, so that users will never see their names in aufs
-+hierarchy.
-+1. a regular file which will be hardlinked to all whiteouts.
-+2. a directory to store a pseudo-link.
-+3. a directory to store an "orphan"-ed file temporary.
-+
-+1. Whiteout Base
-+   When you remove a file on a readonly branch, aufs handles it as a
-+   logical deletion and creates a whiteout on the upper writable branch
-+   as a hardlink of this file in order not to consume inode on the
-+   writable branch.
-+2. Pseudo-link Dir
-+   See below, Pseudo-link.
-+3. Step-Parent Dir
-+   When "fileC" exists on the lower readonly branch only and it is
-+   opened and removed with its parent dir, and then user writes
-+   something into it, then aufs copies-up fileC to this
-+   directory. Because there is no other dir to store fileC. After
-+   creating a file under this dir, the file is unlinked.
-+
-+Because aufs supports manipulating branches, ie. add/delete/change
-+dynamically, a branch has its own id. When the branch order changes,
-+aufs finds the new index by searching the branch id.
-+
-+
-+Pseudo-link
-+----------------------------------------------------------------------
-+Assume "fileA" exists on the lower readonly branch only and it is
-+hardlinked to "fileB" on the branch. When you write something to fileA,
-+aufs copies-up it to the upper writable branch. Additionally aufs
-+creates a hardlink under the Pseudo-link Directory of the writable
-+branch. The inode of a pseudo-link is kept in aufs super_block as a
-+simple list. If fileB is read after unlinking fileA, aufs returns
-+filedata from the pseudo-link instead of the lower readonly
-+branch. Because the pseudo-link is based upon the inode, to keep the
-+inode number by xino (see above) is essentially necessary.
-+
-+All the hardlinks under the Pseudo-link Directory of the writable branch
-+should be restored in a proper location later. Aufs provides a utility
-+to do this. The userspace helpers executed at remounting and unmounting
-+aufs by default.
-+During this utility is running, it puts aufs into the pseudo-link
-+maintenance mode. In this mode, only the process which began the
-+maintenance mode (and its child processes) is allowed to operate in
-+aufs. Some other processes which are not related to the pseudo-link will
-+be allowed to run too, but the rest have to return an error or wait
-+until the maintenance mode ends. If a process already acquires an inode
-+mutex (in VFS), it has to return an error.
-+
-+
-+XIB(external inode number bitmap)
-+----------------------------------------------------------------------
-+Addition to the xino file per a branch, aufs has an external inode number
-+bitmap in a superblock object. It is also an internal file such like a
-+xino file.
-+It is a simple bitmap to mark whether the aufs inode number is in-use or
-+not.
-+To reduce the file I/O, aufs prepares a single memory page to cache xib.
-+
-+As well as XINO files, aufs has a feature to truncate/refresh XIB to
-+reduce the number of consumed disk blocks for these files.
-+
-+
-+Virtual or Vertical Dir, and Readdir in Userspace
-+----------------------------------------------------------------------
-+In order to support multiple layers (branches), aufs readdir operation
-+constructs a virtual dir block on memory. For readdir, aufs calls
-+vfs_readdir() internally for each dir on branches, merges their entries
-+with eliminating the whiteout-ed ones, and sets it to file (dir)
-+object. So the file object has its entry list until it is closed. The
-+entry list will be updated when the file position is zero and becomes
-+obsoleted. This decision is made in aufs automatically.
-+
-+The dynamically allocated memory block for the name of entries has a
-+unit of 512 bytes (by default) and stores the names contiguously (no
-+padding). Another block for each entry is handled by kmem_cache too.
-+During building dir blocks, aufs creates hash list and judging whether
-+the entry is whiteouted by its upper branch or already listed.
-+The merged result is cached in the corresponding inode object and
-+maintained by a customizable life-time option.
-+
-+Some people may call it can be a security hole or invite DoS attack
-+since the opened and once readdir-ed dir (file object) holds its entry
-+list and becomes a pressure for system memory. But I'd say it is similar
-+to files under /proc or /sys. The virtual files in them also holds a
-+memory page (generally) while they are opened. When an idea to reduce
-+memory for them is introduced, it will be applied to aufs too.
-+For those who really hate this situation, I've developed readdir(3)
-+library which operates this merging in userspace. You just need to set
-+LD_PRELOAD environment variable, and aufs will not consume no memory in
-+kernel space for readdir(3).
-+
-+
-+Workqueue
-+----------------------------------------------------------------------
-+Aufs sometimes requires privilege access to a branch. For instance,
-+in copy-up/down operation. When a user process is going to make changes
-+to a file which exists in the lower readonly branch only, and the mode
-+of one of ancestor directories may not be writable by a user
-+process. Here aufs copy-up the file with its ancestors and they may
-+require privilege to set its owner/group/mode/etc.
-+This is a typical case of a application character of aufs (see
-+Introduction).
-+
-+Aufs uses workqueue synchronously for this case. It creates its own
-+workqueue. The workqueue is a kernel thread and has privilege. Aufs
-+passes the request to call mkdir or write (for example), and wait for
-+its completion. This approach solves a problem of a signal handler
-+simply.
-+If aufs didn't adopt the workqueue and changed the privilege of the
-+process, then the process may receive the unexpected SIGXFSZ or other
-+signals.
-+
-+Also aufs uses the system global workqueue ("events" kernel thread) too
-+for asynchronous tasks, such like handling inotify/fsnotify, re-creating a
-+whiteout base and etc. This is unrelated to a privilege.
-+Most of aufs operation tries acquiring a rw_semaphore for aufs
-+superblock at the beginning, at the same time waits for the completion
-+of all queued asynchronous tasks.
-+
-+
-+Whiteout
-+----------------------------------------------------------------------
-+The whiteout in aufs is very similar to Unionfs's. That is represented
-+by its filename. UnionMount takes an approach of a file mode, but I am
-+afraid several utilities (find(1) or something) will have to support it.
-+
-+Basically the whiteout represents "logical deletion" which stops aufs to
-+lookup further, but also it represents "dir is opaque" which also stop
-+further lookup.
-+
-+In aufs, rmdir(2) and rename(2) for dir uses whiteout alternatively.
-+In order to make several functions in a single systemcall to be
-+revertible, aufs adopts an approach to rename a directory to a temporary
-+unique whiteouted name.
-+For example, in rename(2) dir where the target dir already existed, aufs
-+renames the target dir to a temporary unique whiteouted name before the
-+actual rename on a branch, and then handles other actions (make it opaque,
-+update the attributes, etc). If an error happens in these actions, aufs
-+simply renames the whiteouted name back and returns an error. If all are
-+succeeded, aufs registers a function to remove the whiteouted unique
-+temporary name completely and asynchronously to the system global
-+workqueue.
-+
-+
-+Copy-up
-+----------------------------------------------------------------------
-+It is a well-known feature or concept.
-+When user modifies a file on a readonly branch, aufs operate "copy-up"
-+internally and makes change to the new file on the upper writable branch.
-+When the trigger systemcall does not update the timestamps of the parent
-+dir, aufs reverts it after copy-up.
-+
-+
-+Move-down (aufs3.9 and later)
-+----------------------------------------------------------------------
-+"Copy-up" is one of the essential feature in aufs. It copies a file from
-+the lower readonly branch to the upper writable branch when a user
-+changes something about the file.
-+"Move-down" is an opposite action of copy-up. Basically this action is
-+ran manually instead of automatically and internally.
-+For desgin and implementation, aufs has to consider these issues.
-+- whiteout for the file may exist on the lower branch.
-+- ancestor directories may not exist on the lower branch.
-+- diropq for the ancestor directories may exist on the upper branch.
-+- free space on the lower branch will reduce.
-+- another access to the file may happen during moving-down, including
-+  UDBA (see "Revalidate Dentry and UDBA").
-+- the file should not be hard-linked nor pseudo-linked. they should be
-+  handled by auplink utility later.
-+
-+Sometimes users want to move-down a file from the upper writable branch
-+to the lower readonly or writable branch. For instance,
-+- the free space of the upper writable branch is going to run out.
-+- create a new intermediate branch between the upper and lower branch.
-+- etc.
-+
-+For this purpose, use "aumvdown" command in aufs-util.git.
-diff -Nur linux-4.1.10.orig/Documentation/filesystems/aufs/design/03atomic_open.txt linux-4.1.10/Documentation/filesystems/aufs/design/03atomic_open.txt
---- linux-4.1.10.orig/Documentation/filesystems/aufs/design/03atomic_open.txt	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/Documentation/filesystems/aufs/design/03atomic_open.txt	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,85 @@
-+
-+# Copyright (C) 2015 Junjiro R. Okajima
-+# 
-+# This program is free software; you can redistribute it and/or modify
-+# it under the terms of the GNU General Public License as published by
-+# the Free Software Foundation; either version 2 of the License, or
-+# (at your option) any later version.
-+# 
-+# This program is distributed in the hope that it will be useful,
-+# but WITHOUT ANY WARRANTY; without even the implied warranty of
-+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+# GNU General Public License for more details.
-+# 
-+# You should have received a copy of the GNU General Public License
-+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+
-+Support for a branch who has its ->atomic_open()
-+----------------------------------------------------------------------
-+The filesystems who implement its ->atomic_open() are not majority. For
-+example NFSv4 does, and aufs should call NFSv4 ->atomic_open,
-+particularly for open(O_CREAT|O_EXCL, 0400) case. Other than
-+->atomic_open(), NFSv4 returns an error for this open(2). While I am not
-+sure whether all filesystems who have ->atomic_open() behave like this,
-+but NFSv4 surely returns the error.
-+
-+In order to support ->atomic_open() for aufs, there are a few
-+approaches.
-+
-+A. Introduce aufs_atomic_open()
-+   - calls one of VFS:do_last(), lookup_open() or atomic_open() for
-+     branch fs.
-+B. Introduce aufs_atomic_open() calling create, open and chmod. this is
-+   an aufs user Pip Cet's approach
-+   - calls aufs_create(), VFS finish_open() and notify_change().
-+   - pass fake-mode to finish_open(), and then correct the mode by
-+     notify_change().
-+C. Extend aufs_open() to call branch fs's ->atomic_open()
-+   - no aufs_atomic_open().
-+   - aufs_lookup() registers the TID to an aufs internal object.
-+   - aufs_create() does nothing when the matching TID is registered, but
-+     registers the mode.
-+   - aufs_open() calls branch fs's ->atomic_open() when the matching
-+     TID is registered.
-+D. Extend aufs_open() to re-try branch fs's ->open() with superuser's
-+   credential
-+   - no aufs_atomic_open().
-+   - aufs_create() registers the TID to an internal object. this info
-+     represents "this process created this file just now."
-+   - when aufs gets EACCES from branch fs's ->open(), then confirm the
-+     registered TID and re-try open() with superuser's credential.
-+
-+Pros and cons for each approach.
-+
-+A.
-+   - straightforward but highly depends upon VFS internal.
-+   - the atomic behavaiour is kept.
-+   - some of parameters such as nameidata are hard to reproduce for
-+     branch fs.
-+   - large overhead.
-+B.
-+   - easy to implement.
-+   - the atomic behavaiour is lost.
-+C.
-+   - the atomic behavaiour is kept.
-+   - dirty and tricky.
-+   - VFS checks whether the file is created correctly after calling
-+     ->create(), which means this approach doesn't work.
-+D.
-+   - easy to implement.
-+   - the atomic behavaiour is lost.
-+   - to open a file with superuser's credential and give it to a user
-+     process is a bad idea, since the file object keeps the credential
-+     in it. It may affect LSM or something. This approach doesn't work
-+     either.
-+
-+The approach A is ideal, but it hard to implement. So here is a
-+variation of A, which is to be implemented.
-+
-+A-1. Introduce aufs_atomic_open()
-+     - calls branch fs ->atomic_open() if exists. otherwise calls
-+       vfs_create() and finish_open().
-+     - the demerit is that the several checks after branch fs
-+       ->atomic_open() are lost. in the ordinary case, the checks are
-+       done by VFS:do_last(), lookup_open() and atomic_open(). some can
-+       be implemented in aufs, but not all I am afraid.
-diff -Nur linux-4.1.10.orig/Documentation/filesystems/aufs/design/03lookup.txt linux-4.1.10/Documentation/filesystems/aufs/design/03lookup.txt
---- linux-4.1.10.orig/Documentation/filesystems/aufs/design/03lookup.txt	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/Documentation/filesystems/aufs/design/03lookup.txt	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,113 @@
-+
-+# Copyright (C) 2005-2015 Junjiro R. Okajima
-+# 
-+# This program is free software; you can redistribute it and/or modify
-+# it under the terms of the GNU General Public License as published by
-+# the Free Software Foundation; either version 2 of the License, or
-+# (at your option) any later version.
-+# 
-+# This program is distributed in the hope that it will be useful,
-+# but WITHOUT ANY WARRANTY; without even the implied warranty of
-+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+# GNU General Public License for more details.
-+# 
-+# You should have received a copy of the GNU General Public License
-+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+
-+Lookup in a Branch
-+----------------------------------------------------------------------
-+Since aufs has a character of sub-VFS (see Introduction), it operates
-+lookup for branches as VFS does. It may be a heavy work. But almost all
-+lookup operation in aufs is the simplest case, ie. lookup only an entry
-+directly connected to its parent. Digging down the directory hierarchy
-+is unnecessary. VFS has a function lookup_one_len() for that use, and
-+aufs calls it.
-+
-+When a branch is a remote filesystem, aufs basically relies upon its
-+->d_revalidate(), also aufs forces the hardest revalidate tests for
-+them.
-+For d_revalidate, aufs implements three levels of revalidate tests. See
-+"Revalidate Dentry and UDBA" in detail.
-+
-+
-+Test Only the Highest One for the Directory Permission (dirperm1 option)
-+----------------------------------------------------------------------
-+Let's try case study.
-+- aufs has two branches, upper readwrite and lower readonly.
-+  /au = /rw + /ro
-+- "dirA" exists under /ro, but /rw. and its mode is 0700.
-+- user invoked "chmod a+rx /au/dirA"
-+- the internal copy-up is activated and "/rw/dirA" is created and its
-+  permission bits are set to world readable.
-+- then "/au/dirA" becomes world readable?
-+
-+In this case, /ro/dirA is still 0700 since it exists in readonly branch,
-+or it may be a natively readonly filesystem. If aufs respects the lower
-+branch, it should not respond readdir request from other users. But user
-+allowed it by chmod. Should really aufs rejects showing the entries
-+under /ro/dirA?
-+
-+To be honest, I don't have a good solution for this case. So aufs
-+implements 'dirperm1' and 'nodirperm1' mount options, and leave it to
-+users.
-+When dirperm1 is specified, aufs checks only the highest one for the
-+directory permission, and shows the entries. Otherwise, as usual, checks
-+every dir existing on all branches and rejects the request.
-+
-+As a side effect, dirperm1 option improves the performance of aufs
-+because the number of permission check is reduced when the number of
-+branch is many.
-+
-+
-+Revalidate Dentry and UDBA (User's Direct Branch Access)
-+----------------------------------------------------------------------
-+Generally VFS helpers re-validate a dentry as a part of lookup.
-+0. digging down the directory hierarchy.
-+1. lock the parent dir by its i_mutex.
-+2. lookup the final (child) entry.
-+3. revalidate it.
-+4. call the actual operation (create, unlink, etc.)
-+5. unlock the parent dir
-+
-+If the filesystem implements its ->d_revalidate() (step 3), then it is
-+called. Actually aufs implements it and checks the dentry on a branch is
-+still valid.
-+But it is not enough. Because aufs has to release the lock for the
-+parent dir on a branch at the end of ->lookup() (step 2) and
-+->d_revalidate() (step 3) while the i_mutex of the aufs dir is still
-+held by VFS.
-+If the file on a branch is changed directly, eg. bypassing aufs, after
-+aufs released the lock, then the subsequent operation may cause
-+something unpleasant result.
-+
-+This situation is a result of VFS architecture, ->lookup() and
-+->d_revalidate() is separated. But I never say it is wrong. It is a good
-+design from VFS's point of view. It is just not suitable for sub-VFS
-+character in aufs.
-+
-+Aufs supports such case by three level of revalidation which is
-+selectable by user.
-+1. Simple Revalidate
-+   Addition to the native flow in VFS's, confirm the child-parent
-+   relationship on the branch just after locking the parent dir on the
-+   branch in the "actual operation" (step 4). When this validation
-+   fails, aufs returns EBUSY. ->d_revalidate() (step 3) in aufs still
-+   checks the validation of the dentry on branches.
-+2. Monitor Changes Internally by Inotify/Fsnotify
-+   Addition to above, in the "actual operation" (step 4) aufs re-lookup
-+   the dentry on the branch, and returns EBUSY if it finds different
-+   dentry.
-+   Additionally, aufs sets the inotify/fsnotify watch for every dir on branches
-+   during it is in cache. When the event is notified, aufs registers a
-+   function to kernel 'events' thread by schedule_work(). And the
-+   function sets some special status to the cached aufs dentry and inode
-+   private data. If they are not cached, then aufs has nothing to
-+   do. When the same file is accessed through aufs (step 0-3) later,
-+   aufs will detect the status and refresh all necessary data.
-+   In this mode, aufs has to ignore the event which is fired by aufs
-+   itself.
-+3. No Extra Validation
-+   This is the simplest test and doesn't add any additional revalidation
-+   test, and skip the revalidation in step 4. It is useful and improves
-+   aufs performance when system surely hide the aufs branches from user,
-+   by over-mounting something (or another method).
-diff -Nur linux-4.1.10.orig/Documentation/filesystems/aufs/design/04branch.txt linux-4.1.10/Documentation/filesystems/aufs/design/04branch.txt
---- linux-4.1.10.orig/Documentation/filesystems/aufs/design/04branch.txt	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/Documentation/filesystems/aufs/design/04branch.txt	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,74 @@
-+
-+# Copyright (C) 2005-2015 Junjiro R. Okajima
-+# 
-+# This program is free software; you can redistribute it and/or modify
-+# it under the terms of the GNU General Public License as published by
-+# the Free Software Foundation; either version 2 of the License, or
-+# (at your option) any later version.
-+# 
-+# This program is distributed in the hope that it will be useful,
-+# but WITHOUT ANY WARRANTY; without even the implied warranty of
-+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+# GNU General Public License for more details.
-+# 
-+# You should have received a copy of the GNU General Public License
-+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+
-+Branch Manipulation
-+
-+Since aufs supports dynamic branch manipulation, ie. add/remove a branch
-+and changing its permission/attribute, there are a lot of works to do.
-+
-+
-+Add a Branch
-+----------------------------------------------------------------------
-+o Confirm the adding dir exists outside of aufs, including loopback
-+  mount, and its various attributes.
-+o Initialize the xino file and whiteout bases if necessary.
-+  See struct.txt.
-+
-+o Check the owner/group/mode of the directory
-+  When the owner/group/mode of the adding directory differs from the
-+  existing branch, aufs issues a warning because it may impose a
-+  security risk.
-+  For example, when a upper writable branch has a world writable empty
-+  top directory, a malicious user can create any files on the writable
-+  branch directly, like copy-up and modify manually. If something like
-+  /etc/{passwd,shadow} exists on the lower readonly branch but the upper
-+  writable branch, and the writable branch is world-writable, then a
-+  malicious guy may create /etc/passwd on the writable branch directly
-+  and the infected file will be valid in aufs.
-+  I am afraid it can be a security issue, but aufs can do nothing except
-+  producing a warning.
-+
-+
-+Delete a Branch
-+----------------------------------------------------------------------
-+o Confirm the deleting branch is not busy
-+  To be general, there is one merit to adopt "remount" interface to
-+  manipulate branches. It is to discard caches. At deleting a branch,
-+  aufs checks the still cached (and connected) dentries and inodes. If
-+  there are any, then they are all in-use. An inode without its
-+  corresponding dentry can be alive alone (for example, inotify/fsnotify case).
-+
-+  For the cached one, aufs checks whether the same named entry exists on
-+  other branches.
-+  If the cached one is a directory, because aufs provides a merged view
-+  to users, as long as one dir is left on any branch aufs can show the
-+  dir to users. In this case, the branch can be removed from aufs.
-+  Otherwise aufs rejects deleting the branch.
-+
-+  If any file on the deleting branch is opened by aufs, then aufs
-+  rejects deleting.
-+
-+
-+Modify the Permission of a Branch
-+----------------------------------------------------------------------
-+o Re-initialize or remove the xino file and whiteout bases if necessary.
-+  See struct.txt.
-+
-+o rw --> ro: Confirm the modifying branch is not busy
-+  Aufs rejects the request if any of these conditions are true.
-+  - a file on the branch is mmap-ed.
-+  - a regular file on the branch is opened for write and there is no
-+    same named entry on the upper branch.
-diff -Nur linux-4.1.10.orig/Documentation/filesystems/aufs/design/05wbr_policy.txt linux-4.1.10/Documentation/filesystems/aufs/design/05wbr_policy.txt
---- linux-4.1.10.orig/Documentation/filesystems/aufs/design/05wbr_policy.txt	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/Documentation/filesystems/aufs/design/05wbr_policy.txt	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,64 @@
-+
-+# Copyright (C) 2005-2015 Junjiro R. Okajima
-+# 
-+# This program is free software; you can redistribute it and/or modify
-+# it under the terms of the GNU General Public License as published by
-+# the Free Software Foundation; either version 2 of the License, or
-+# (at your option) any later version.
-+# 
-+# This program is distributed in the hope that it will be useful,
-+# but WITHOUT ANY WARRANTY; without even the implied warranty of
-+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+# GNU General Public License for more details.
-+# 
-+# You should have received a copy of the GNU General Public License
-+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+
-+Policies to Select One among Multiple Writable Branches
-+----------------------------------------------------------------------
-+When the number of writable branch is more than one, aufs has to decide
-+the target branch for file creation or copy-up. By default, the highest
-+writable branch which has the parent (or ancestor) dir of the target
-+file is chosen (top-down-parent policy).
-+By user's request, aufs implements some other policies to select the
-+writable branch, for file creation several policies, round-robin,
-+most-free-space, and other policies. For copy-up, top-down-parent,
-+bottom-up-parent, bottom-up and others.
-+
-+As expected, the round-robin policy selects the branch in circular. When
-+you have two writable branches and creates 10 new files, 5 files will be
-+created for each branch. mkdir(2) systemcall is an exception. When you
-+create 10 new directories, all will be created on the same branch.
-+And the most-free-space policy selects the one which has most free
-+space among the writable branches. The amount of free space will be
-+checked by aufs internally, and users can specify its time interval.
-+
-+The policies for copy-up is more simple,
-+top-down-parent is equivalent to the same named on in create policy,
-+bottom-up-parent selects the writable branch where the parent dir
-+exists and the nearest upper one from the copyup-source,
-+bottom-up selects the nearest upper writable branch from the
-+copyup-source, regardless the existence of the parent dir.
-+
-+There are some rules or exceptions to apply these policies.
-+- If there is a readonly branch above the policy-selected branch and
-+  the parent dir is marked as opaque (a variation of whiteout), or the
-+  target (creating) file is whiteout-ed on the upper readonly branch,
-+  then the result of the policy is ignored and the target file will be
-+  created on the nearest upper writable branch than the readonly branch.
-+- If there is a writable branch above the policy-selected branch and
-+  the parent dir is marked as opaque or the target file is whiteouted
-+  on the branch, then the result of the policy is ignored and the target
-+  file will be created on the highest one among the upper writable
-+  branches who has diropq or whiteout. In case of whiteout, aufs removes
-+  it as usual.
-+- link(2) and rename(2) systemcalls are exceptions in every policy.
-+  They try selecting the branch where the source exists as possible
-+  since copyup a large file will take long time. If it can't be,
-+  ie. the branch where the source exists is readonly, then they will
-+  follow the copyup policy.
-+- There is an exception for rename(2) when the target exists.
-+  If the rename target exists, aufs compares the index of the branches
-+  where the source and the target exists and selects the higher
-+  one. If the selected branch is readonly, then aufs follows the
-+  copyup policy.
-diff -Nur linux-4.1.10.orig/Documentation/filesystems/aufs/design/06fhsm.txt linux-4.1.10/Documentation/filesystems/aufs/design/06fhsm.txt
---- linux-4.1.10.orig/Documentation/filesystems/aufs/design/06fhsm.txt	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/Documentation/filesystems/aufs/design/06fhsm.txt	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,120 @@
-+
-+# Copyright (C) 2011-2015 Junjiro R. Okajima
-+# 
-+# This program is free software; you can redistribute it and/or modify
-+# it under the terms of the GNU General Public License as published by
-+# the Free Software Foundation; either version 2 of the License, or
-+# (at your option) any later version.
-+# 
-+# This program is distributed in the hope that it will be useful,
-+# but WITHOUT ANY WARRANTY; without even the implied warranty of
-+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+# GNU General Public License for more details.
-+# 
-+# You should have received a copy of the GNU General Public License
-+# along with this program; if not, write to the Free Software
-+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
-+
-+
-+File-based Hierarchical Storage Management (FHSM)
-+----------------------------------------------------------------------
-+Hierarchical Storage Management (or HSM) is a well-known feature in the
-+storage world. Aufs provides this feature as file-based with multiple
-+writable branches, based upon the principle of "Colder, the Lower".
-+Here the word "colder" means that the less used files, and "lower" means
-+that the position in the order of the stacked branches vertically.
-+These multiple writable branches are prioritized, ie. the topmost one
-+should be the fastest drive and be used heavily.
-+
-+o Characters in aufs FHSM story
-+- aufs itself and a new branch attribute.
-+- a new ioctl interface to move-down and to establish a connection with
-+  the daemon ("move-down" is a converse of "copy-up").
-+- userspace tool and daemon.
-+
-+The userspace daemon establishes a connection with aufs and waits for
-+the notification. The notified information is very similar to struct
-+statfs containing the number of consumed blocks and inodes.
-+When the consumed blocks/inodes of a branch exceeds the user-specified
-+upper watermark, the daemon activates its move-down process until the
-+consumed blocks/inodes reaches the user-specified lower watermark.
-+
-+The actual move-down is done by aufs based upon the request from
-+user-space since we need to maintain the inode number and the internal
-+pointer arrays in aufs.
-+
-+Currently aufs FHSM handles the regular files only. Additionally they
-+must not be hard-linked nor pseudo-linked.
-+
-+
-+o Cowork of aufs and the user-space daemon
-+  During the userspace daemon established the connection, aufs sends a
-+  small notification to it whenever aufs writes something into the
-+  writable branch. But it may cost high since aufs issues statfs(2)
-+  internally. So user can specify a new option to cache the
-+  info. Actually the notification is controlled by these factors.
-+  + the specified cache time.
-+  + classified as "force" by aufs internally.
-+  Until the specified time expires, aufs doesn't send the info
-+  except the forced cases. When aufs decide forcing, the info is always
-+  notified to userspace.
-+  For example, the number of free inodes is generally large enough and
-+  the shortage of it happens rarely. So aufs doesn't force the
-+  notification when creating a new file, directory and others. This is
-+  the typical case which aufs doesn't force.
-+  When aufs writes the actual filedata and the files consumes any of new
-+  blocks, the aufs forces notifying.
-+
-+
-+o Interfaces in aufs
-+- New branch attribute.
-+  + fhsm
-+    Specifies that the branch is managed by FHSM feature. In other word,
-+    participant in the FHSM.
-+    When nofhsm is set to the branch, it will not be the source/target
-+    branch of the move-down operation. This attribute is set
-+    independently from coo and moo attributes, and if you want full
-+    FHSM, you should specify them as well.
-+- New mount option.
-+  + fhsm_sec
-+    Specifies a second to suppress many less important info to be
-+    notified.
-+- New ioctl.
-+  + AUFS_CTL_FHSM_FD
-+    create a new file descriptor which userspace can read the notification
-+    (a subset of struct statfs) from aufs.
-+- Module parameter 'brs'
-+  It has to be set to 1. Otherwise the new mount option 'fhsm' will not
-+  be set.
-+- mount helpers /sbin/mount.aufs and /sbin/umount.aufs
-+  When there are two or more branches with fhsm attributes,
-+  /sbin/mount.aufs invokes the user-space daemon and /sbin/umount.aufs
-+  terminates it. As a result of remounting and branch-manipulation, the
-+  number of branches with fhsm attribute can be one. In this case,
-+  /sbin/mount.aufs will terminate the user-space daemon.
-+
-+
-+Finally the operation is done as these steps in kernel-space.
-+- make sure that,
-+  + no one else is using the file.
-+  + the file is not hard-linked.
-+  + the file is not pseudo-linked.
-+  + the file is a regular file.
-+  + the parent dir is not opaqued.
-+- find the target writable branch.
-+- make sure the file is not whiteout-ed by the upper (than the target)
-+  branch.
-+- make the parent dir on the target branch.
-+- mutex lock the inode on the branch.
-+- unlink the whiteout on the target branch (if exists).
-+- lookup and create the whiteout-ed temporary name on the target branch.
-+- copy the file as the whiteout-ed temporary name on the target branch.
-+- rename the whiteout-ed temporary name to the original name.
-+- unlink the file on the source branch.
-+- maintain the internal pointer array and the external inode number
-+  table (XINO).
-+- maintain the timestamps and other attributes of the parent dir and the
-+  file.
-+
-+And of course, in every step, an error may happen. So the operation
-+should restore the original file state after an error happens.
-diff -Nur linux-4.1.10.orig/Documentation/filesystems/aufs/design/06mmap.txt linux-4.1.10/Documentation/filesystems/aufs/design/06mmap.txt
---- linux-4.1.10.orig/Documentation/filesystems/aufs/design/06mmap.txt	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/Documentation/filesystems/aufs/design/06mmap.txt	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,72 @@
-+
-+# Copyright (C) 2005-2015 Junjiro R. Okajima
-+# 
-+# This program is free software; you can redistribute it and/or modify
-+# it under the terms of the GNU General Public License as published by
-+# the Free Software Foundation; either version 2 of the License, or
-+# (at your option) any later version.
-+# 
-+# This program is distributed in the hope that it will be useful,
-+# but WITHOUT ANY WARRANTY; without even the implied warranty of
-+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+# GNU General Public License for more details.
-+# 
-+# You should have received a copy of the GNU General Public License
-+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+
-+mmap(2) -- File Memory Mapping
-+----------------------------------------------------------------------
-+In aufs, the file-mapped pages are handled by a branch fs directly, no
-+interaction with aufs. It means aufs_mmap() calls the branch fs's
-+->mmap().
-+This approach is simple and good, but there is one problem.
-+Under /proc, several entries show the mmapped files by its path (with
-+device and inode number), and the printed path will be the path on the
-+branch fs's instead of virtual aufs's.
-+This is not a problem in most cases, but some utilities lsof(1) (and its
-+user) may expect the path on aufs.
-+
-+To address this issue, aufs adds a new member called vm_prfile in struct
-+vm_area_struct (and struct vm_region). The original vm_file points to
-+the file on the branch fs in order to handle everything correctly as
-+usual. The new vm_prfile points to a virtual file in aufs, and the
-+show-functions in procfs refers to vm_prfile if it is set.
-+Also we need to maintain several other places where touching vm_file
-+such like
-+- fork()/clone() copies vma and the reference count of vm_file is
-+  incremented.
-+- merging vma maintains the ref count too.
-+
-+This is not a good approach. It just fakes the printed path. But it
-+leaves all behaviour around f_mapping unchanged. This is surely an
-+advantage.
-+Actually aufs had adopted another complicated approach which calls
-+generic_file_mmap() and handles struct vm_operations_struct. In this
-+approach, aufs met a hard problem and I could not solve it without
-+switching the approach.
-+
-+There may be one more another approach which is
-+- bind-mount the branch-root onto the aufs-root internally
-+- grab the new vfsmount (ie. struct mount)
-+- lazy-umount the branch-root internally
-+- in open(2) the aufs-file, open the branch-file with the hidden
-+  vfsmount (instead of the original branch's vfsmount)
-+- ideally this "bind-mount and lazy-umount" should be done atomically,
-+  but it may be possible from userspace by the mount helper.
-+
-+Adding the internal hidden vfsmount and using it in opening a file, the
-+file path under /proc will be printed correctly. This approach looks
-+smarter, but is not possible I am afraid.
-+- aufs-root may be bind-mount later. when it happens, another hidden
-+  vfsmount will be required.
-+- it is hard to get the chance to bind-mount and lazy-umount
-+  + in kernel-space, FS can have vfsmount in open(2) via
-+    file->f_path, and aufs can know its vfsmount. But several locks are
-+    already acquired, and if aufs tries to bind-mount and lazy-umount
-+    here, then it may cause a deadlock.
-+  + in user-space, bind-mount doesn't invoke the mount helper.
-+- since /proc shows dev and ino, aufs has to give vma these info. it
-+  means a new member vm_prinode will be necessary. this is essentially
-+  equivalent to vm_prfile described above.
-+
-+I have to give up this "looks-smater" approach.
-diff -Nur linux-4.1.10.orig/Documentation/filesystems/aufs/design/06xattr.txt linux-4.1.10/Documentation/filesystems/aufs/design/06xattr.txt
---- linux-4.1.10.orig/Documentation/filesystems/aufs/design/06xattr.txt	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/Documentation/filesystems/aufs/design/06xattr.txt	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,96 @@
-+
-+# Copyright (C) 2014-2015 Junjiro R. Okajima
-+#
-+# This program is free software; you can redistribute it and/or modify
-+# it under the terms of the GNU General Public License as published by
-+# the Free Software Foundation; either version 2 of the License, or
-+# (at your option) any later version.
-+#
-+# This program is distributed in the hope that it will be useful,
-+# but WITHOUT ANY WARRANTY; without even the implied warranty of
-+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+# GNU General Public License for more details.
-+#
-+# You should have received a copy of the GNU General Public License
-+# along with this program; if not, write to the Free Software
-+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
-+
-+
-+Listing XATTR/EA and getting the value
-+----------------------------------------------------------------------
-+For the inode standard attributes (owner, group, timestamps, etc.), aufs
-+shows the values from the topmost existing file. This behaviour is good
-+for the non-dir entries since the bahaviour exactly matches the shown
-+information. But for the directories, aufs considers all the same named
-+entries on the lower branches. Which means, if one of the lower entry
-+rejects readdir call, then aufs returns an error even if the topmost
-+entry allows it. This behaviour is necessary to respect the branch fs's
-+security, but can make users confused since the user-visible standard
-+attributes don't match the behaviour.
-+To address this issue, aufs has a mount option called dirperm1 which
-+checks the permission for the topmost entry only, and ignores the lower
-+entry's permission.
-+
-+A similar issue can happen around XATTR.
-+getxattr(2) and listxattr(2) families behave as if dirperm1 option is
-+always set. Otherwise these very unpleasant situation would happen.
-+- listxattr(2) may return the duplicated entries.
-+- users may not be able to remove or reset the XATTR forever,
-+
-+
-+XATTR/EA support in the internal (copy,move)-(up,down)
-+----------------------------------------------------------------------
-+Generally the extended attributes of inode are categorized as these.
-+- "security" for LSM and capability.
-+- "system" for posix ACL, 'acl' mount option is required for the branch
-+  fs generally.
-+- "trusted" for userspace, CAP_SYS_ADMIN is required.
-+- "user" for userspace, 'user_xattr' mount option is required for the
-+  branch fs generally.
-+
-+Moreover there are some other categories. Aufs handles these rather
-+unpopular categories as the ordinary ones, ie. there is no special
-+condition nor exception.
-+
-+In copy-up, the support for XATTR on the dst branch may differ from the
-+src branch. In this case, the copy-up operation will get an error and
-+the original user operation which triggered the copy-up will fail. It
-+can happen that even all copy-up will fail.
-+When both of src and dst branches support XATTR and if an error occurs
-+during copying XATTR, then the copy-up should fail obviously. That is a
-+good reason and aufs should return an error to userspace. But when only
-+the src branch support that XATTR, aufs should not return an error.
-+For example, the src branch supports ACL but the dst branch doesn't
-+because the dst branch may natively un-support it or temporary
-+un-support it due to "noacl" mount option. Of course, the dst branch fs
-+may NOT return an error even if the XATTR is not supported. It is
-+totally up to the branch fs.
-+
-+Anyway when the aufs internal copy-up gets an error from the dst branch
-+fs, then aufs tries removing the just copied entry and returns the error
-+to the userspace. The worst case of this situation will be all copy-up
-+will fail.
-+
-+For the copy-up operation, there two basic approaches.
-+- copy the specified XATTR only (by category above), and return the
-+  error unconditionally if it happens.
-+- copy all XATTR, and ignore the error on the specified category only.
-+
-+In order to support XATTR and to implement the correct behaviour, aufs
-+chooses the latter approach and introduces some new branch attributes,
-+"icexsec", "icexsys", "icextr", "icexusr", and "icexoth".
-+They correspond to the XATTR namespaces (see above). Additionally, to be
-+convenient, "icex" is also provided which means all "icex*" attributes
-+are set (here the word "icex" stands for "ignore copy-error on XATTR").
-+
-+The meaning of these attributes is to ignore the error from setting
-+XATTR on that branch.
-+Note that aufs tries copying all XATTR unconditionally, and ignores the
-+error from the dst branch according to the specified attributes.
-+
-+Some XATTR may have its default value. The default value may come from
-+the parent dir or the environment. If the default value is set at the
-+file creating-time, it will be overwritten by copy-up.
-+Some contradiction may happen I am afraid.
-+Do we need another attribute to stop copying XATTR? I am unsure. For
-+now, aufs implements the branch attributes to ignore the error.
-diff -Nur linux-4.1.10.orig/Documentation/filesystems/aufs/design/07export.txt linux-4.1.10/Documentation/filesystems/aufs/design/07export.txt
---- linux-4.1.10.orig/Documentation/filesystems/aufs/design/07export.txt	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/Documentation/filesystems/aufs/design/07export.txt	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,58 @@
-+
-+# Copyright (C) 2005-2015 Junjiro R. Okajima
-+# 
-+# This program is free software; you can redistribute it and/or modify
-+# it under the terms of the GNU General Public License as published by
-+# the Free Software Foundation; either version 2 of the License, or
-+# (at your option) any later version.
-+# 
-+# This program is distributed in the hope that it will be useful,
-+# but WITHOUT ANY WARRANTY; without even the implied warranty of
-+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+# GNU General Public License for more details.
-+# 
-+# You should have received a copy of the GNU General Public License
-+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+
-+Export Aufs via NFS
-+----------------------------------------------------------------------
-+Here is an approach.
-+- like xino/xib, add a new file 'xigen' which stores aufs inode
-+  generation.
-+- iget_locked(): initialize aufs inode generation for a new inode, and
-+  store it in xigen file.
-+- destroy_inode(): increment aufs inode generation and store it in xigen
-+  file. it is necessary even if it is not unlinked, because any data of
-+  inode may be changed by UDBA.
-+- encode_fh(): for a root dir, simply return FILEID_ROOT. otherwise
-+  build file handle by
-+  + branch id (4 bytes)
-+  + superblock generation (4 bytes)
-+  + inode number (4 or 8 bytes)
-+  + parent dir inode number (4 or 8 bytes)
-+  + inode generation (4 bytes))
-+  + return value of exportfs_encode_fh() for the parent on a branch (4
-+    bytes)
-+  + file handle for a branch (by exportfs_encode_fh())
-+- fh_to_dentry():
-+  + find the index of a branch from its id in handle, and check it is
-+    still exist in aufs.
-+  + 1st level: get the inode number from handle and search it in cache.
-+  + 2nd level: if not found in cache, get the parent inode number from
-+    the handle and search it in cache. and then open the found parent
-+    dir, find the matching inode number by vfs_readdir() and get its
-+    name, and call lookup_one_len() for the target dentry.
-+  + 3rd level: if the parent dir is not cached, call
-+    exportfs_decode_fh() for a branch and get the parent on a branch,
-+    build a pathname of it, convert it a pathname in aufs, call
-+    path_lookup(). now aufs gets a parent dir dentry, then handle it as
-+    the 2nd level.
-+  + to open the dir, aufs needs struct vfsmount. aufs keeps vfsmount
-+    for every branch, but not itself. to get this, (currently) aufs
-+    searches in current->nsproxy->mnt_ns list. it may not be a good
-+    idea, but I didn't get other approach.
-+  + test the generation of the gotten inode.
-+- every inode operation: they may get EBUSY due to UDBA. in this case,
-+  convert it into ESTALE for NFSD.
-+- readdir(): call lockdep_on/off() because filldir in NFSD calls
-+  lookup_one_len(), vfs_getattr(), encode_fh() and others.
-diff -Nur linux-4.1.10.orig/Documentation/filesystems/aufs/design/08shwh.txt linux-4.1.10/Documentation/filesystems/aufs/design/08shwh.txt
---- linux-4.1.10.orig/Documentation/filesystems/aufs/design/08shwh.txt	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/Documentation/filesystems/aufs/design/08shwh.txt	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,52 @@
-+
-+# Copyright (C) 2005-2015 Junjiro R. Okajima
-+# 
-+# This program is free software; you can redistribute it and/or modify
-+# it under the terms of the GNU General Public License as published by
-+# the Free Software Foundation; either version 2 of the License, or
-+# (at your option) any later version.
-+# 
-+# This program is distributed in the hope that it will be useful,
-+# but WITHOUT ANY WARRANTY; without even the implied warranty of
-+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+# GNU General Public License for more details.
-+# 
-+# You should have received a copy of the GNU General Public License
-+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+
-+Show Whiteout Mode (shwh)
-+----------------------------------------------------------------------
-+Generally aufs hides the name of whiteouts. But in some cases, to show
-+them is very useful for users. For instance, creating a new middle layer
-+(branch) by merging existing layers.
-+
-+(borrowing aufs1 HOW-TO from a user, Michael Towers)
-+When you have three branches,
-+- Bottom: 'system', squashfs (underlying base system), read-only
-+- Middle: 'mods', squashfs, read-only
-+- Top: 'overlay', ram (tmpfs), read-write
-+
-+The top layer is loaded at boot time and saved at shutdown, to preserve
-+the changes made to the system during the session.
-+When larger changes have been made, or smaller changes have accumulated,
-+the size of the saved top layer data grows. At this point, it would be
-+nice to be able to merge the two overlay branches ('mods' and 'overlay')
-+and rewrite the 'mods' squashfs, clearing the top layer and thus
-+restoring save and load speed.
-+
-+This merging is simplified by the use of another aufs mount, of just the
-+two overlay branches using the 'shwh' option.
-+# mount -t aufs -o ro,shwh,br:/livesys/overlay=ro+wh:/livesys/mods=rr+wh \
-+	aufs /livesys/merge_union
-+
-+A merged view of these two branches is then available at
-+/livesys/merge_union, and the new feature is that the whiteouts are
-+visible!
-+Note that in 'shwh' mode the aufs mount must be 'ro', which will disable
-+writing to all branches. Also the default mode for all branches is 'ro'.
-+It is now possible to save the combined contents of the two overlay
-+branches to a new squashfs, e.g.:
-+# mksquashfs /livesys/merge_union /path/to/newmods.squash
-+
-+This new squashfs archive can be stored on the boot device and the
-+initramfs will use it to replace the old one at the next boot.
-diff -Nur linux-4.1.10.orig/Documentation/filesystems/aufs/design/10dynop.txt linux-4.1.10/Documentation/filesystems/aufs/design/10dynop.txt
---- linux-4.1.10.orig/Documentation/filesystems/aufs/design/10dynop.txt	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/Documentation/filesystems/aufs/design/10dynop.txt	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,47 @@
-+
-+# Copyright (C) 2010-2015 Junjiro R. Okajima
-+#
-+# This program is free software; you can redistribute it and/or modify
-+# it under the terms of the GNU General Public License as published by
-+# the Free Software Foundation; either version 2 of the License, or
-+# (at your option) any later version.
-+#
-+# This program is distributed in the hope that it will be useful,
-+# but WITHOUT ANY WARRANTY; without even the implied warranty of
-+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+# GNU General Public License for more details.
-+#
-+# You should have received a copy of the GNU General Public License
-+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+
-+Dynamically customizable FS operations
-+----------------------------------------------------------------------
-+Generally FS operations (struct inode_operations, struct
-+address_space_operations, struct file_operations, etc.) are defined as
-+"static const", but it never means that FS have only one set of
-+operation. Some FS have multiple sets of them. For instance, ext2 has
-+three sets, one for XIP, for NOBH, and for normal.
-+Since aufs overrides and redirects these operations, sometimes aufs has
-+to change its behaviour according to the branch FS type. More importantly
-+VFS acts differently if a function (member in the struct) is set or
-+not. It means aufs should have several sets of operations and select one
-+among them according to the branch FS definition.
-+
-+In order to solve this problem and not to affect the behaviour of VFS,
-+aufs defines these operations dynamically. For instance, aufs defines
-+dummy direct_IO function for struct address_space_operations, but it may
-+not be set to the address_space_operations actually. When the branch FS
-+doesn't have it, aufs doesn't set it to its address_space_operations
-+while the function definition itself is still alive. So the behaviour
-+itself will not change, and it will return an error when direct_IO is
-+not set.
-+
-+The lifetime of these dynamically generated operation object is
-+maintained by aufs branch object. When the branch is removed from aufs,
-+the reference counter of the object is decremented. When it reaches
-+zero, the dynamically generated operation object will be freed.
-+
-+This approach is designed to support AIO (io_submit), Direct I/O and
-+XIP (DAX) mainly.
-+Currently this approach is applied to address_space_operations for
-+regular files only.
-diff -Nur linux-4.1.10.orig/Documentation/filesystems/aufs/README linux-4.1.10/Documentation/filesystems/aufs/README
---- linux-4.1.10.orig/Documentation/filesystems/aufs/README	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/Documentation/filesystems/aufs/README	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,383 @@
-+
-+Aufs4 -- advanced multi layered unification filesystem version 4.x
-+http://aufs.sf.net
-+Junjiro R. Okajima
-+
-+
-+0. Introduction
-+----------------------------------------
-+In the early days, aufs was entirely re-designed and re-implemented
-+Unionfs Version 1.x series. Adding many original ideas, approaches,
-+improvements and implementations, it becomes totally different from
-+Unionfs while keeping the basic features.
-+Recently, Unionfs Version 2.x series begin taking some of the same
-+approaches to aufs1's.
-+Unionfs is being developed by Professor Erez Zadok at Stony Brook
-+University and his team.
-+
-+Aufs4 supports linux-4.0 and later, and for linux-3.x series try aufs3.
-+If you want older kernel version support, try aufs2-2.6.git or
-+aufs2-standalone.git repository, aufs1 from CVS on SourceForge.
-+
-+Note: it becomes clear that "Aufs was rejected. Let's give it up."
-+      According to Christoph Hellwig, linux rejects all union-type
-+      filesystems but UnionMount.
-+<http://marc.info/?l=linux-kernel&m=123938533724484&w=2>
-+
-+PS. Al Viro seems have a plan to merge aufs as well as overlayfs and
-+    UnionMount, and he pointed out an issue around a directory mutex
-+    lock and aufs addressed it. But it is still unsure whether aufs will
-+    be merged (or any other union solution).
-+<http://marc.info/?l=linux-kernel&m=136312705029295&w=1>
-+
-+
-+1. Features
-+----------------------------------------
-+- unite several directories into a single virtual filesystem. The member
-+  directory is called as a branch.
-+- you can specify the permission flags to the branch, which are 'readonly',
-+  'readwrite' and 'whiteout-able.'
-+- by upper writable branch, internal copyup and whiteout, files/dirs on
-+  readonly branch are modifiable logically.
-+- dynamic branch manipulation, add, del.
-+- etc...
-+
-+Also there are many enhancements in aufs, such as:
-+- test only the highest one for the directory permission (dirperm1)
-+- copyup on open (coo=)
-+- 'move' policy for copy-up between two writable branches, after
-+  checking free space.
-+- xattr, acl
-+- readdir(3) in userspace.
-+- keep inode number by external inode number table
-+- keep the timestamps of file/dir in internal copyup operation
-+- seekable directory, supporting NFS readdir.
-+- whiteout is hardlinked in order to reduce the consumption of inodes
-+  on branch
-+- do not copyup, nor create a whiteout when it is unnecessary
-+- revert a single systemcall when an error occurs in aufs
-+- remount interface instead of ioctl
-+- maintain /etc/mtab by an external command, /sbin/mount.aufs.
-+- loopback mounted filesystem as a branch
-+- kernel thread for removing the dir who has a plenty of whiteouts
-+- support copyup sparse file (a file which has a 'hole' in it)
-+- default permission flags for branches
-+- selectable permission flags for ro branch, whether whiteout can
-+  exist or not
-+- export via NFS.
-+- support <sysfs>/fs/aufs and <debugfs>/aufs.
-+- support multiple writable branches, some policies to select one
-+  among multiple writable branches.
-+- a new semantics for link(2) and rename(2) to support multiple
-+  writable branches.
-+- no glibc changes are required.
-+- pseudo hardlink (hardlink over branches)
-+- allow a direct access manually to a file on branch, e.g. bypassing aufs.
-+  including NFS or remote filesystem branch.
-+- userspace wrapper for pathconf(3)/fpathconf(3) with _PC_LINK_MAX.
-+- and more...
-+
-+Currently these features are dropped temporary from aufs4.
-+See design/08plan.txt in detail.
-+- nested mount, i.e. aufs as readonly no-whiteout branch of another aufs
-+  (robr)
-+- statistics of aufs thread (/sys/fs/aufs/stat)
-+
-+Features or just an idea in the future (see also design/*.txt),
-+- reorder the branch index without del/re-add.
-+- permanent xino files for NFSD
-+- an option for refreshing the opened files after add/del branches
-+- light version, without branch manipulation. (unnecessary?)
-+- copyup in userspace
-+- inotify in userspace
-+- readv/writev
-+
-+
-+2. Download
-+----------------------------------------
-+There are three GIT trees for aufs4, aufs4-linux.git,
-+aufs4-standalone.git, and aufs-util.git. Note that there is no "4" in
-+"aufs-util.git."
-+While the aufs-util is always necessary, you need either of aufs4-linux
-+or aufs4-standalone.
-+
-+The aufs4-linux tree includes the whole linux mainline GIT tree,
-+git://git.kernel.org/.../torvalds/linux.git.
-+And you cannot select CONFIG_AUFS_FS=m for this version, eg. you cannot
-+build aufs4 as an external kernel module.
-+Several extra patches are not included in this tree. Only
-+aufs4-standalone tree contains them. They are describe in the later
-+section "Configuration and Compilation."
-+
-+On the other hand, the aufs4-standalone tree has only aufs source files
-+and necessary patches, and you can select CONFIG_AUFS_FS=m.
-+But you need to apply all aufs patches manually.
-+
-+You will find GIT branches whose name is in form of "aufs4.x" where "x"
-+represents the linux kernel version, "linux-4.x". For instance,
-+"aufs4.0" is for linux-4.0. For latest "linux-4.x-rcN", use
-+"aufs4.x-rcN" branch.
-+
-+o aufs4-linux tree
-+$ git clone --reference /your/linux/git/tree \
-+	git://github.com/sfjro/aufs4-linux.git aufs4-linux.git
-+- if you don't have linux GIT tree, then remove "--reference ..."
-+$ cd aufs4-linux.git
-+$ git checkout origin/aufs4.0
-+
-+Or You may want to directly git-pull aufs into your linux GIT tree, and
-+leave the patch-work to GIT.
-+$ cd /your/linux/git/tree
-+$ git remote add aufs4 git://github.com/sfjro/aufs4-linux.git
-+$ git fetch aufs4
-+$ git checkout -b my4.0 v4.0
-+$ (add your local change...)
-+$ git pull aufs4 aufs4.0
-+- now you have v4.0 + your_changes + aufs4.0 in you my4.0 branch.
-+- you may need to solve some conflicts between your_changes and
-+  aufs4.0. in this case, git-rerere is recommended so that you can
-+  solve the similar conflicts automatically when you upgrade to 4.1 or
-+  later in the future.
-+
-+o aufs4-standalone tree
-+$ git clone git://github.com/sfjro/aufs4-standalone.git aufs4-standalone.git
-+$ cd aufs4-standalone.git
-+$ git checkout origin/aufs4.0
-+
-+o aufs-util tree
-+$ git clone git://git.code.sf.net/p/aufs/aufs-util aufs-util.git
-+- note that the public aufs-util.git is on SourceForge instead of
-+  GitHUB.
-+$ cd aufs-util.git
-+$ git checkout origin/aufs4.0
-+
-+Note: The 4.x-rcN branch is to be used with `rc' kernel versions ONLY.
-+The minor version number, 'x' in '4.x', of aufs may not always
-+follow the minor version number of the kernel.
-+Because changes in the kernel that cause the use of a new
-+minor version number do not always require changes to aufs-util.
-+
-+Since aufs-util has its own minor version number, you may not be
-+able to find a GIT branch in aufs-util for your kernel's
-+exact minor version number.
-+In this case, you should git-checkout the branch for the
-+nearest lower number.
-+
-+For (an unreleased) example:
-+If you are using "linux-4.10" and the "aufs4.10" branch
-+does not exist in aufs-util repository, then "aufs4.9", "aufs4.8"
-+or something numerically smaller is the branch for your kernel.
-+
-+Also you can view all branches by
-+	$ git branch -a
-+
-+
-+3. Configuration and Compilation
-+----------------------------------------
-+Make sure you have git-checkout'ed the correct branch.
-+
-+For aufs4-linux tree,
-+- enable CONFIG_AUFS_FS.
-+- set other aufs configurations if necessary.
-+
-+For aufs4-standalone tree,
-+There are several ways to build.
-+
-+1.
-+- apply ./aufs4-kbuild.patch to your kernel source files.
-+- apply ./aufs4-base.patch too.
-+- apply ./aufs4-mmap.patch too.
-+- apply ./aufs4-standalone.patch too, if you have a plan to set
-+  CONFIG_AUFS_FS=m. otherwise you don't need ./aufs4-standalone.patch.
-+- copy ./{Documentation,fs,include/uapi/linux/aufs_type.h} files to your
-+  kernel source tree. Never copy $PWD/include/uapi/linux/Kbuild.
-+- enable CONFIG_AUFS_FS, you can select either
-+  =m or =y.
-+- and build your kernel as usual.
-+- install the built kernel.
-+  Note: Since linux-3.9, every filesystem module requires an alias
-+  "fs-<fsname>". You should make sure that "fs-aufs" is listed in your
-+  modules.aliases file if you set CONFIG_AUFS_FS=m.
-+- install the header files too by "make headers_install" to the
-+  directory where you specify. By default, it is $PWD/usr.
-+  "make help" shows a brief note for headers_install.
-+- and reboot your system.
-+
-+2.
-+- module only (CONFIG_AUFS_FS=m).
-+- apply ./aufs4-base.patch to your kernel source files.
-+- apply ./aufs4-mmap.patch too.
-+- apply ./aufs4-standalone.patch too.
-+- build your kernel, don't forget "make headers_install", and reboot.
-+- edit ./config.mk and set other aufs configurations if necessary.
-+  Note: You should read $PWD/fs/aufs/Kconfig carefully which describes
-+  every aufs configurations.
-+- build the module by simple "make".
-+  Note: Since linux-3.9, every filesystem module requires an alias
-+  "fs-<fsname>". You should make sure that "fs-aufs" is listed in your
-+  modules.aliases file.
-+- you can specify ${KDIR} make variable which points to your kernel
-+  source tree.
-+- install the files
-+  + run "make install" to install the aufs module, or copy the built
-+    $PWD/aufs.ko to /lib/modules/... and run depmod -a (or reboot simply).
-+  + run "make install_headers" (instead of headers_install) to install
-+    the modified aufs header file (you can specify DESTDIR which is
-+    available in aufs standalone version's Makefile only), or copy
-+    $PWD/usr/include/linux/aufs_type.h to /usr/include/linux or wherever
-+    you like manually. By default, the target directory is $PWD/usr.
-+- no need to apply aufs4-kbuild.patch, nor copying source files to your
-+  kernel source tree.
-+
-+Note: The header file aufs_type.h is necessary to build aufs-util
-+      as well as "make headers_install" in the kernel source tree.
-+      headers_install is subject to be forgotten, but it is essentially
-+      necessary, not only for building aufs-util.
-+      You may not meet problems without headers_install in some older
-+      version though.
-+
-+And then,
-+- read README in aufs-util, build and install it
-+- note that your distribution may contain an obsoleted version of
-+  aufs_type.h in /usr/include/linux or something. When you build aufs
-+  utilities, make sure that your compiler refers the correct aufs header
-+  file which is built by "make headers_install."
-+- if you want to use readdir(3) in userspace or pathconf(3) wrapper,
-+  then run "make install_ulib" too. And refer to the aufs manual in
-+  detail.
-+
-+There several other patches in aufs4-standalone.git. They are all
-+optional. When you meet some problems, they will help you.
-+- aufs4-loopback.patch
-+  Supports a nested loopback mount in a branch-fs. This patch is
-+  unnecessary until aufs produces a message like "you may want to try
-+  another patch for loopback file".
-+- vfs-ino.patch
-+  Modifies a system global kernel internal function get_next_ino() in
-+  order to stop assigning 0 for an inode-number. Not directly related to
-+  aufs, but recommended generally.
-+- tmpfs-idr.patch
-+  Keeps the tmpfs inode number as the lowest value. Effective to reduce
-+  the size of aufs XINO files for tmpfs branch. Also it prevents the
-+  duplication of inode number, which is important for backup tools and
-+  other utilities. When you find aufs XINO files for tmpfs branch
-+  growing too much, try this patch.
-+
-+
-+4. Usage
-+----------------------------------------
-+At first, make sure aufs-util are installed, and please read the aufs
-+manual, aufs.5 in aufs-util.git tree.
-+$ man -l aufs.5
-+
-+And then,
-+$ mkdir /tmp/rw /tmp/aufs
-+# mount -t aufs -o br=/tmp/rw:${HOME} none /tmp/aufs
-+
-+Here is another example. The result is equivalent.
-+# mount -t aufs -o br=/tmp/rw=rw:${HOME}=ro none /tmp/aufs
-+  Or
-+# mount -t aufs -o br:/tmp/rw none /tmp/aufs
-+# mount -o remount,append:${HOME} /tmp/aufs
-+
-+Then, you can see whole tree of your home dir through /tmp/aufs. If
-+you modify a file under /tmp/aufs, the one on your home directory is
-+not affected, instead the same named file will be newly created under
-+/tmp/rw. And all of your modification to a file will be applied to
-+the one under /tmp/rw. This is called the file based Copy on Write
-+(COW) method.
-+Aufs mount options are described in aufs.5.
-+If you run chroot or something and make your aufs as a root directory,
-+then you need to customize the shutdown script. See the aufs manual in
-+detail.
-+
-+Additionally, there are some sample usages of aufs which are a
-+diskless system with network booting, and LiveCD over NFS.
-+See sample dir in CVS tree on SourceForge.
-+
-+
-+5. Contact
-+----------------------------------------
-+When you have any problems or strange behaviour in aufs, please let me
-+know with:
-+- /proc/mounts (instead of the output of mount(8))
-+- /sys/module/aufs/*
-+- /sys/fs/aufs/* (if you have them)
-+- /debug/aufs/* (if you have them)
-+- linux kernel version
-+  if your kernel is not plain, for example modified by distributor,
-+  the url where i can download its source is necessary too.
-+- aufs version which was printed at loading the module or booting the
-+  system, instead of the date you downloaded.
-+- configuration (define/undefine CONFIG_AUFS_xxx)
-+- kernel configuration or /proc/config.gz (if you have it)
-+- behaviour which you think to be incorrect
-+- actual operation, reproducible one is better
-+- mailto: aufs-users at lists.sourceforge.net
-+
-+Usually, I don't watch the Public Areas(Bugs, Support Requests, Patches,
-+and Feature Requests) on SourceForge. Please join and write to
-+aufs-users ML.
-+
-+
-+6. Acknowledgements
-+----------------------------------------
-+Thanks to everyone who have tried and are using aufs, whoever
-+have reported a bug or any feedback.
-+
-+Especially donators:
-+Tomas Matejicek(slax.org) made a donation (much more than once).
-+	Since Apr 2010, Tomas M (the author of Slax and Linux Live
-+	scripts) is making "doubling" donations.
-+	Unfortunately I cannot list all of the donators, but I really
-+	appreciate.
-+	It ends Aug 2010, but the ordinary donation URL is still available.
-+	<http://sourceforge.net/donate/index.php?group_id=167503>
-+Dai Itasaka made a donation (2007/8).
-+Chuck Smith made a donation (2008/4, 10 and 12).
-+Henk Schoneveld made a donation (2008/9).
-+Chih-Wei Huang, ASUS, CTC donated Eee PC 4G (2008/10).
-+Francois Dupoux made a donation (2008/11).
-+Bruno Cesar Ribas and Luis Carlos Erpen de Bona, C3SL serves public
-+	aufs2 GIT tree (2009/2).
-+William Grant made a donation (2009/3).
-+Patrick Lane made a donation (2009/4).
-+The Mail Archive (mail-archive.com) made donations (2009/5).
-+Nippy Networks (Ed Wildgoose) made a donation (2009/7).
-+New Dream Network, LLC (www.dreamhost.com) made a donation (2009/11).
-+Pavel Pronskiy made a donation (2011/2).
-+Iridium and Inmarsat satellite phone retailer (www.mailasail.com), Nippy
-+	Networks (Ed Wildgoose) made a donation for hardware (2011/3).
-+Max Lekomcev (DOM-TV project) made a donation (2011/7, 12, 2012/3, 6 and
-+11).
-+Sam Liddicott made a donation (2011/9).
-+Era Scarecrow made a donation (2013/4).
-+Bor Ratajc made a donation (2013/4).
-+Alessandro Gorreta made a donation (2013/4).
-+POIRETTE Marc made a donation (2013/4).
-+Alessandro Gorreta made a donation (2013/4).
-+lauri kasvandik made a donation (2013/5).
-+"pemasu from Finland" made a donation (2013/7).
-+The Parted Magic Project made a donation (2013/9 and 11).
-+Pavel Barta made a donation (2013/10).
-+Nikolay Pertsev made a donation (2014/5).
-+James B made a donation (2014/7 and 2015/7).
-+Stefano Di Biase made a donation (2014/8).
-+Daniel Epellei made a donation (2015/1).
-+
-+Thank you very much.
-+Donations are always, including future donations, very important and
-+helpful for me to keep on developing aufs.
-+
-+
-+7.
-+----------------------------------------
-+If you are an experienced user, no explanation is needed. Aufs is
-+just a linux filesystem.
-+
-+
-+Enjoy!
-+
-+# Local variables: ;
-+# mode: text;
-+# End: ;
-diff -Nur linux-4.1.10.orig/drivers/block/loop.c linux-4.1.10/drivers/block/loop.c
---- linux-4.1.10.orig/drivers/block/loop.c	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/drivers/block/loop.c	2015-10-22 21:35:53.000000000 +0200
-@@ -538,6 +538,24 @@
- 	return i && S_ISBLK(i->i_mode) && MAJOR(i->i_rdev) == LOOP_MAJOR;
- }
- 
-+/*
-+ * for AUFS
-+ * no get/put for file.
-+ */
-+struct file *loop_backing_file(struct super_block *sb)
-+{
-+	struct file *ret;
-+	struct loop_device *l;
-+
-+	ret = NULL;
-+	if (MAJOR(sb->s_dev) == LOOP_MAJOR) {
-+		l = sb->s_bdev->bd_disk->private_data;
-+		ret = l->lo_backing_file;
-+	}
-+	return ret;
-+}
-+EXPORT_SYMBOL(loop_backing_file);
-+
- /* loop sysfs attributes */
- 
- static ssize_t loop_attr_show(struct device *dev, char *page,
-diff -Nur linux-4.1.10.orig/fs/aufs/aufs.h linux-4.1.10/fs/aufs/aufs.h
---- linux-4.1.10.orig/fs/aufs/aufs.h	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/aufs.h	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,59 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * all header files
-+ */
-+
-+#ifndef __AUFS_H__
-+#define __AUFS_H__
-+
-+#ifdef __KERNEL__
-+
-+#define AuStub(type, name, body, ...) \
-+	static inline type name(__VA_ARGS__) { body; }
-+
-+#define AuStubVoid(name, ...) \
-+	AuStub(void, name, , __VA_ARGS__)
-+#define AuStubInt0(name, ...) \
-+	AuStub(int, name, return 0, __VA_ARGS__)
-+
-+#include "debug.h"
-+
-+#include "branch.h"
-+#include "cpup.h"
-+#include "dcsub.h"
-+#include "dbgaufs.h"
-+#include "dentry.h"
-+#include "dir.h"
-+#include "dynop.h"
-+#include "file.h"
-+#include "fstype.h"
-+#include "inode.h"
-+#include "loop.h"
-+#include "module.h"
-+#include "opts.h"
-+#include "rwsem.h"
-+#include "spl.h"
-+#include "super.h"
-+#include "sysaufs.h"
-+#include "vfsub.h"
-+#include "whout.h"
-+#include "wkq.h"
-+
-+#endif /* __KERNEL__ */
-+#endif /* __AUFS_H__ */
-diff -Nur linux-4.1.10.orig/fs/aufs/branch.c linux-4.1.10/fs/aufs/branch.c
---- linux-4.1.10.orig/fs/aufs/branch.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/branch.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,1414 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * branch management
-+ */
-+
-+#include <linux/compat.h>
-+#include <linux/statfs.h>
-+#include "aufs.h"
-+
-+/*
-+ * free a single branch
-+ */
-+static void au_br_do_free(struct au_branch *br)
-+{
-+	int i;
-+	struct au_wbr *wbr;
-+	struct au_dykey **key;
-+
-+	au_hnotify_fin_br(br);
-+
-+	if (br->br_xino.xi_file)
-+		fput(br->br_xino.xi_file);
-+	mutex_destroy(&br->br_xino.xi_nondir_mtx);
-+
-+	AuDebugOn(atomic_read(&br->br_count));
-+
-+	wbr = br->br_wbr;
-+	if (wbr) {
-+		for (i = 0; i < AuBrWh_Last; i++)
-+			dput(wbr->wbr_wh[i]);
-+		AuDebugOn(atomic_read(&wbr->wbr_wh_running));
-+		AuRwDestroy(&wbr->wbr_wh_rwsem);
-+	}
-+
-+	if (br->br_fhsm) {
-+		au_br_fhsm_fin(br->br_fhsm);
-+		kfree(br->br_fhsm);
-+	}
-+
-+	key = br->br_dykey;
-+	for (i = 0; i < AuBrDynOp; i++, key++)
-+		if (*key)
-+			au_dy_put(*key);
-+		else
-+			break;
-+
-+	/* recursive lock, s_umount of branch's */
-+	lockdep_off();
-+	path_put(&br->br_path);
-+	lockdep_on();
-+	kfree(wbr);
-+	kfree(br);
-+}
-+
-+/*
-+ * frees all branches
-+ */
-+void au_br_free(struct au_sbinfo *sbinfo)
-+{
-+	aufs_bindex_t bmax;
-+	struct au_branch **br;
-+
-+	AuRwMustWriteLock(&sbinfo->si_rwsem);
-+
-+	bmax = sbinfo->si_bend + 1;
-+	br = sbinfo->si_branch;
-+	while (bmax--)
-+		au_br_do_free(*br++);
-+}
-+
-+/*
-+ * find the index of a branch which is specified by @br_id.
-+ */
-+int au_br_index(struct super_block *sb, aufs_bindex_t br_id)
-+{
-+	aufs_bindex_t bindex, bend;
-+
-+	bend = au_sbend(sb);
-+	for (bindex = 0; bindex <= bend; bindex++)
-+		if (au_sbr_id(sb, bindex) == br_id)
-+			return bindex;
-+	return -1;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/*
-+ * add a branch
-+ */
-+
-+static int test_overlap(struct super_block *sb, struct dentry *h_adding,
-+			struct dentry *h_root)
-+{
-+	if (unlikely(h_adding == h_root
-+		     || au_test_loopback_overlap(sb, h_adding)))
-+		return 1;
-+	if (h_adding->d_sb != h_root->d_sb)
-+		return 0;
-+	return au_test_subdir(h_adding, h_root)
-+		|| au_test_subdir(h_root, h_adding);
-+}
-+
-+/*
-+ * returns a newly allocated branch. @new_nbranch is a number of branches
-+ * after adding a branch.
-+ */
-+static struct au_branch *au_br_alloc(struct super_block *sb, int new_nbranch,
-+				     int perm)
-+{
-+	struct au_branch *add_branch;
-+	struct dentry *root;
-+	struct inode *inode;
-+	int err;
-+
-+	err = -ENOMEM;
-+	root = sb->s_root;
-+	add_branch = kmalloc(sizeof(*add_branch), GFP_NOFS);
-+	if (unlikely(!add_branch))
-+		goto out;
-+
-+	err = au_hnotify_init_br(add_branch, perm);
-+	if (unlikely(err))
-+		goto out_br;
-+
-+	add_branch->br_wbr = NULL;
-+	if (au_br_writable(perm)) {
-+		/* may be freed separately at changing the branch permission */
-+		add_branch->br_wbr = kmalloc(sizeof(*add_branch->br_wbr),
-+					     GFP_NOFS);
-+		if (unlikely(!add_branch->br_wbr))
-+			goto out_hnotify;
-+	}
-+
-+	add_branch->br_fhsm = NULL;
-+	if (au_br_fhsm(perm)) {
-+		err = au_fhsm_br_alloc(add_branch);
-+		if (unlikely(err))
-+			goto out_wbr;
-+	}
-+
-+	err = au_sbr_realloc(au_sbi(sb), new_nbranch);
-+	if (!err)
-+		err = au_di_realloc(au_di(root), new_nbranch);
-+	if (!err) {
-+		inode = d_inode(root);
-+		err = au_ii_realloc(au_ii(inode), new_nbranch);
-+	}
-+	if (!err)
-+		return add_branch; /* success */
-+
-+out_wbr:
-+	kfree(add_branch->br_wbr);
-+out_hnotify:
-+	au_hnotify_fin_br(add_branch);
-+out_br:
-+	kfree(add_branch);
-+out:
-+	return ERR_PTR(err);
-+}
-+
-+/*
-+ * test if the branch permission is legal or not.
-+ */
-+static int test_br(struct inode *inode, int brperm, char *path)
-+{
-+	int err;
-+
-+	err = (au_br_writable(brperm) && IS_RDONLY(inode));
-+	if (!err)
-+		goto out;
-+
-+	err = -EINVAL;
-+	pr_err("write permission for readonly mount or inode, %s\n", path);
-+
-+out:
-+	return err;
-+}
-+
-+/*
-+ * returns:
-+ * 0: success, the caller will add it
-+ * plus: success, it is already unified, the caller should ignore it
-+ * minus: error
-+ */
-+static int test_add(struct super_block *sb, struct au_opt_add *add, int remount)
-+{
-+	int err;
-+	aufs_bindex_t bend, bindex;
-+	struct dentry *root, *h_dentry;
-+	struct inode *inode, *h_inode;
-+
-+	root = sb->s_root;
-+	bend = au_sbend(sb);
-+	if (unlikely(bend >= 0
-+		     && au_find_dbindex(root, add->path.dentry) >= 0)) {
-+		err = 1;
-+		if (!remount) {
-+			err = -EINVAL;
-+			pr_err("%s duplicated\n", add->pathname);
-+		}
-+		goto out;
-+	}
-+
-+	err = -ENOSPC; /* -E2BIG; */
-+	if (unlikely(AUFS_BRANCH_MAX <= add->bindex
-+		     || AUFS_BRANCH_MAX - 1 <= bend)) {
-+		pr_err("number of branches exceeded %s\n", add->pathname);
-+		goto out;
-+	}
-+
-+	err = -EDOM;
-+	if (unlikely(add->bindex < 0 || bend + 1 < add->bindex)) {
-+		pr_err("bad index %d\n", add->bindex);
-+		goto out;
-+	}
-+
-+	inode = d_inode(add->path.dentry);
-+	err = -ENOENT;
-+	if (unlikely(!inode->i_nlink)) {
-+		pr_err("no existence %s\n", add->pathname);
-+		goto out;
-+	}
-+
-+	err = -EINVAL;
-+	if (unlikely(inode->i_sb == sb)) {
-+		pr_err("%s must be outside\n", add->pathname);
-+		goto out;
-+	}
-+
-+	if (unlikely(au_test_fs_unsuppoted(inode->i_sb))) {
-+		pr_err("unsupported filesystem, %s (%s)\n",
-+		       add->pathname, au_sbtype(inode->i_sb));
-+		goto out;
-+	}
-+
-+	if (unlikely(inode->i_sb->s_stack_depth)) {
-+		pr_err("already stacked, %s (%s)\n",
-+		       add->pathname, au_sbtype(inode->i_sb));
-+		goto out;
-+	}
-+
-+	err = test_br(d_inode(add->path.dentry), add->perm, add->pathname);
-+	if (unlikely(err))
-+		goto out;
-+
-+	if (bend < 0)
-+		return 0; /* success */
-+
-+	err = -EINVAL;
-+	for (bindex = 0; bindex <= bend; bindex++)
-+		if (unlikely(test_overlap(sb, add->path.dentry,
-+					  au_h_dptr(root, bindex)))) {
-+			pr_err("%s is overlapped\n", add->pathname);
-+			goto out;
-+		}
-+
-+	err = 0;
-+	if (au_opt_test(au_mntflags(sb), WARN_PERM)) {
-+		h_dentry = au_h_dptr(root, 0);
-+		h_inode = d_inode(h_dentry);
-+		if ((h_inode->i_mode & S_IALLUGO) != (inode->i_mode & S_IALLUGO)
-+		    || !uid_eq(h_inode->i_uid, inode->i_uid)
-+		    || !gid_eq(h_inode->i_gid, inode->i_gid))
-+			pr_warn("uid/gid/perm %s %u/%u/0%o, %u/%u/0%o\n",
-+				add->pathname,
-+				i_uid_read(inode), i_gid_read(inode),
-+				(inode->i_mode & S_IALLUGO),
-+				i_uid_read(h_inode), i_gid_read(h_inode),
-+				(h_inode->i_mode & S_IALLUGO));
-+	}
-+
-+out:
-+	return err;
-+}
-+
-+/*
-+ * initialize or clean the whiteouts for an adding branch
-+ */
-+static int au_br_init_wh(struct super_block *sb, struct au_branch *br,
-+			 int new_perm)
-+{
-+	int err, old_perm;
-+	aufs_bindex_t bindex;
-+	struct mutex *h_mtx;
-+	struct au_wbr *wbr;
-+	struct au_hinode *hdir;
-+	struct dentry *h_dentry;
-+
-+	err = vfsub_mnt_want_write(au_br_mnt(br));
-+	if (unlikely(err))
-+		goto out;
-+
-+	wbr = br->br_wbr;
-+	old_perm = br->br_perm;
-+	br->br_perm = new_perm;
-+	hdir = NULL;
-+	h_mtx = NULL;
-+	bindex = au_br_index(sb, br->br_id);
-+	if (0 <= bindex) {
-+		hdir = au_hi(d_inode(sb->s_root), bindex);
-+		au_hn_imtx_lock_nested(hdir, AuLsc_I_PARENT);
-+	} else {
-+		h_dentry = au_br_dentry(br);
-+		h_mtx = &d_inode(h_dentry)->i_mutex;
-+		mutex_lock_nested(h_mtx, AuLsc_I_PARENT);
-+	}
-+	if (!wbr)
-+		err = au_wh_init(br, sb);
-+	else {
-+		wbr_wh_write_lock(wbr);
-+		err = au_wh_init(br, sb);
-+		wbr_wh_write_unlock(wbr);
-+	}
-+	if (hdir)
-+		au_hn_imtx_unlock(hdir);
-+	else
-+		mutex_unlock(h_mtx);
-+	vfsub_mnt_drop_write(au_br_mnt(br));
-+	br->br_perm = old_perm;
-+
-+	if (!err && wbr && !au_br_writable(new_perm)) {
-+		kfree(wbr);
-+		br->br_wbr = NULL;
-+	}
-+
-+out:
-+	return err;
-+}
-+
-+static int au_wbr_init(struct au_branch *br, struct super_block *sb,
-+		       int perm)
-+{
-+	int err;
-+	struct kstatfs kst;
-+	struct au_wbr *wbr;
-+
-+	wbr = br->br_wbr;
-+	au_rw_init(&wbr->wbr_wh_rwsem);
-+	memset(wbr->wbr_wh, 0, sizeof(wbr->wbr_wh));
-+	atomic_set(&wbr->wbr_wh_running, 0);
-+	wbr->wbr_bytes = 0;
-+
-+	/*
-+	 * a limit for rmdir/rename a dir
-+	 * cf. AUFS_MAX_NAMELEN in include/uapi/linux/aufs_type.h
-+	 */
-+	err = vfs_statfs(&br->br_path, &kst);
-+	if (unlikely(err))
-+		goto out;
-+	err = -EINVAL;
-+	if (kst.f_namelen >= NAME_MAX)
-+		err = au_br_init_wh(sb, br, perm);
-+	else
-+		pr_err("%pd(%s), unsupported namelen %ld\n",
-+		       au_br_dentry(br),
-+		       au_sbtype(au_br_dentry(br)->d_sb), kst.f_namelen);
-+
-+out:
-+	return err;
-+}
-+
-+/* initialize a new branch */
-+static int au_br_init(struct au_branch *br, struct super_block *sb,
-+		      struct au_opt_add *add)
-+{
-+	int err;
-+	struct inode *h_inode;
-+
-+	err = 0;
-+	memset(&br->br_xino, 0, sizeof(br->br_xino));
-+	mutex_init(&br->br_xino.xi_nondir_mtx);
-+	br->br_perm = add->perm;
-+	br->br_path = add->path; /* set first, path_get() later */
-+	spin_lock_init(&br->br_dykey_lock);
-+	memset(br->br_dykey, 0, sizeof(br->br_dykey));
-+	atomic_set(&br->br_count, 0);
-+	atomic_set(&br->br_xino_running, 0);
-+	br->br_id = au_new_br_id(sb);
-+	AuDebugOn(br->br_id < 0);
-+
-+	if (au_br_writable(add->perm)) {
-+		err = au_wbr_init(br, sb, add->perm);
-+		if (unlikely(err))
-+			goto out_err;
-+	}
-+
-+	if (au_opt_test(au_mntflags(sb), XINO)) {
-+		h_inode = d_inode(add->path.dentry);
-+		err = au_xino_br(sb, br, h_inode->i_ino,
-+				 au_sbr(sb, 0)->br_xino.xi_file, /*do_test*/1);
-+		if (unlikely(err)) {
-+			AuDebugOn(br->br_xino.xi_file);
-+			goto out_err;
-+		}
-+	}
-+
-+	sysaufs_br_init(br);
-+	path_get(&br->br_path);
-+	goto out; /* success */
-+
-+out_err:
-+	memset(&br->br_path, 0, sizeof(br->br_path));
-+out:
-+	return err;
-+}
-+
-+static void au_br_do_add_brp(struct au_sbinfo *sbinfo, aufs_bindex_t bindex,
-+			     struct au_branch *br, aufs_bindex_t bend,
-+			     aufs_bindex_t amount)
-+{
-+	struct au_branch **brp;
-+
-+	AuRwMustWriteLock(&sbinfo->si_rwsem);
-+
-+	brp = sbinfo->si_branch + bindex;
-+	memmove(brp + 1, brp, sizeof(*brp) * amount);
-+	*brp = br;
-+	sbinfo->si_bend++;
-+	if (unlikely(bend < 0))
-+		sbinfo->si_bend = 0;
-+}
-+
-+static void au_br_do_add_hdp(struct au_dinfo *dinfo, aufs_bindex_t bindex,
-+			     aufs_bindex_t bend, aufs_bindex_t amount)
-+{
-+	struct au_hdentry *hdp;
-+
-+	AuRwMustWriteLock(&dinfo->di_rwsem);
-+
-+	hdp = dinfo->di_hdentry + bindex;
-+	memmove(hdp + 1, hdp, sizeof(*hdp) * amount);
-+	au_h_dentry_init(hdp);
-+	dinfo->di_bend++;
-+	if (unlikely(bend < 0))
-+		dinfo->di_bstart = 0;
-+}
-+
-+static void au_br_do_add_hip(struct au_iinfo *iinfo, aufs_bindex_t bindex,
-+			     aufs_bindex_t bend, aufs_bindex_t amount)
-+{
-+	struct au_hinode *hip;
-+
-+	AuRwMustWriteLock(&iinfo->ii_rwsem);
-+
-+	hip = iinfo->ii_hinode + bindex;
-+	memmove(hip + 1, hip, sizeof(*hip) * amount);
-+	hip->hi_inode = NULL;
-+	au_hn_init(hip);
-+	iinfo->ii_bend++;
-+	if (unlikely(bend < 0))
-+		iinfo->ii_bstart = 0;
-+}
-+
-+static void au_br_do_add(struct super_block *sb, struct au_branch *br,
-+			 aufs_bindex_t bindex)
-+{
-+	struct dentry *root, *h_dentry;
-+	struct inode *root_inode, *h_inode;
-+	aufs_bindex_t bend, amount;
-+
-+	root = sb->s_root;
-+	root_inode = d_inode(root);
-+	bend = au_sbend(sb);
-+	amount = bend + 1 - bindex;
-+	h_dentry = au_br_dentry(br);
-+	au_sbilist_lock();
-+	au_br_do_add_brp(au_sbi(sb), bindex, br, bend, amount);
-+	au_br_do_add_hdp(au_di(root), bindex, bend, amount);
-+	au_br_do_add_hip(au_ii(root_inode), bindex, bend, amount);
-+	au_set_h_dptr(root, bindex, dget(h_dentry));
-+	h_inode = d_inode(h_dentry);
-+	au_set_h_iptr(root_inode, bindex, au_igrab(h_inode), /*flags*/0);
-+	au_sbilist_unlock();
-+}
-+
-+int au_br_add(struct super_block *sb, struct au_opt_add *add, int remount)
-+{
-+	int err;
-+	aufs_bindex_t bend, add_bindex;
-+	struct dentry *root, *h_dentry;
-+	struct inode *root_inode;
-+	struct au_branch *add_branch;
-+
-+	root = sb->s_root;
-+	root_inode = d_inode(root);
-+	IMustLock(root_inode);
-+	err = test_add(sb, add, remount);
-+	if (unlikely(err < 0))
-+		goto out;
-+	if (err) {
-+		err = 0;
-+		goto out; /* success */
-+	}
-+
-+	bend = au_sbend(sb);
-+	add_branch = au_br_alloc(sb, bend + 2, add->perm);
-+	err = PTR_ERR(add_branch);
-+	if (IS_ERR(add_branch))
-+		goto out;
-+
-+	err = au_br_init(add_branch, sb, add);
-+	if (unlikely(err)) {
-+		au_br_do_free(add_branch);
-+		goto out;
-+	}
-+
-+	add_bindex = add->bindex;
-+	if (!remount)
-+		au_br_do_add(sb, add_branch, add_bindex);
-+	else {
-+		sysaufs_brs_del(sb, add_bindex);
-+		au_br_do_add(sb, add_branch, add_bindex);
-+		sysaufs_brs_add(sb, add_bindex);
-+	}
-+
-+	h_dentry = add->path.dentry;
-+	if (!add_bindex) {
-+		au_cpup_attr_all(root_inode, /*force*/1);
-+		sb->s_maxbytes = h_dentry->d_sb->s_maxbytes;
-+	} else
-+		au_add_nlink(root_inode, d_inode(h_dentry));
-+
-+	/*
-+	 * this test/set prevents aufs from handling unnecesary notify events
-+	 * of xino files, in case of re-adding a writable branch which was
-+	 * once detached from aufs.
-+	 */
-+	if (au_xino_brid(sb) < 0
-+	    && au_br_writable(add_branch->br_perm)
-+	    && !au_test_fs_bad_xino(h_dentry->d_sb)
-+	    && add_branch->br_xino.xi_file
-+	    && add_branch->br_xino.xi_file->f_path.dentry->d_parent == h_dentry)
-+		au_xino_brid_set(sb, add_branch->br_id);
-+
-+out:
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static unsigned long long au_farray_cb(void *a,
-+				       unsigned long long max __maybe_unused,
-+				       void *arg)
-+{
-+	unsigned long long n;
-+	struct file **p, *f;
-+	struct au_sphlhead *files;
-+	struct au_finfo *finfo;
-+	struct super_block *sb = arg;
-+
-+	n = 0;
-+	p = a;
-+	files = &au_sbi(sb)->si_files;
-+	spin_lock(&files->spin);
-+	hlist_for_each_entry(finfo, &files->head, fi_hlist) {
-+		f = finfo->fi_file;
-+		if (file_count(f)
-+		    && !special_file(file_inode(f)->i_mode)) {
-+			get_file(f);
-+			*p++ = f;
-+			n++;
-+			AuDebugOn(n > max);
-+		}
-+	}
-+	spin_unlock(&files->spin);
-+
-+	return n;
-+}
-+
-+static struct file **au_farray_alloc(struct super_block *sb,
-+				     unsigned long long *max)
-+{
-+	*max = atomic_long_read(&au_sbi(sb)->si_nfiles);
-+	return au_array_alloc(max, au_farray_cb, sb);
-+}
-+
-+static void au_farray_free(struct file **a, unsigned long long max)
-+{
-+	unsigned long long ull;
-+
-+	for (ull = 0; ull < max; ull++)
-+		if (a[ull])
-+			fput(a[ull]);
-+	au_array_free(a);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/*
-+ * delete a branch
-+ */
-+
-+/* to show the line number, do not make it inlined function */
-+#define AuVerbose(do_info, fmt, ...) do { \
-+	if (do_info) \
-+		pr_info(fmt, ##__VA_ARGS__); \
-+} while (0)
-+
-+static int au_test_ibusy(struct inode *inode, aufs_bindex_t bstart,
-+			 aufs_bindex_t bend)
-+{
-+	return (inode && !S_ISDIR(inode->i_mode)) || bstart == bend;
-+}
-+
-+static int au_test_dbusy(struct dentry *dentry, aufs_bindex_t bstart,
-+			 aufs_bindex_t bend)
-+{
-+	return au_test_ibusy(d_inode(dentry), bstart, bend);
-+}
-+
-+/*
-+ * test if the branch is deletable or not.
-+ */
-+static int test_dentry_busy(struct dentry *root, aufs_bindex_t bindex,
-+			    unsigned int sigen, const unsigned int verbose)
-+{
-+	int err, i, j, ndentry;
-+	aufs_bindex_t bstart, bend;
-+	struct au_dcsub_pages dpages;
-+	struct au_dpage *dpage;
-+	struct dentry *d;
-+
-+	err = au_dpages_init(&dpages, GFP_NOFS);
-+	if (unlikely(err))
-+		goto out;
-+	err = au_dcsub_pages(&dpages, root, NULL, NULL);
-+	if (unlikely(err))
-+		goto out_dpages;
-+
-+	for (i = 0; !err && i < dpages.ndpage; i++) {
-+		dpage = dpages.dpages + i;
-+		ndentry = dpage->ndentry;
-+		for (j = 0; !err && j < ndentry; j++) {
-+			d = dpage->dentries[j];
-+			AuDebugOn(au_dcount(d) <= 0);
-+			if (!au_digen_test(d, sigen)) {
-+				di_read_lock_child(d, AuLock_IR);
-+				if (unlikely(au_dbrange_test(d))) {
-+					di_read_unlock(d, AuLock_IR);
-+					continue;
-+				}
-+			} else {
-+				di_write_lock_child(d);
-+				if (unlikely(au_dbrange_test(d))) {
-+					di_write_unlock(d);
-+					continue;
-+				}
-+				err = au_reval_dpath(d, sigen);
-+				if (!err)
-+					di_downgrade_lock(d, AuLock_IR);
-+				else {
-+					di_write_unlock(d);
-+					break;
-+				}
-+			}
-+
-+			/* AuDbgDentry(d); */
-+			bstart = au_dbstart(d);
-+			bend = au_dbend(d);
-+			if (bstart <= bindex
-+			    && bindex <= bend
-+			    && au_h_dptr(d, bindex)
-+			    && au_test_dbusy(d, bstart, bend)) {
-+				err = -EBUSY;
-+				AuVerbose(verbose, "busy %pd\n", d);
-+				AuDbgDentry(d);
-+			}
-+			di_read_unlock(d, AuLock_IR);
-+		}
-+	}
-+
-+out_dpages:
-+	au_dpages_free(&dpages);
-+out:
-+	return err;
-+}
-+
-+static int test_inode_busy(struct super_block *sb, aufs_bindex_t bindex,
-+			   unsigned int sigen, const unsigned int verbose)
-+{
-+	int err;
-+	unsigned long long max, ull;
-+	struct inode *i, **array;
-+	aufs_bindex_t bstart, bend;
-+
-+	array = au_iarray_alloc(sb, &max);
-+	err = PTR_ERR(array);
-+	if (IS_ERR(array))
-+		goto out;
-+
-+	err = 0;
-+	AuDbg("b%d\n", bindex);
-+	for (ull = 0; !err && ull < max; ull++) {
-+		i = array[ull];
-+		if (unlikely(!i))
-+			break;
-+		if (i->i_ino == AUFS_ROOT_INO)
-+			continue;
-+
-+		/* AuDbgInode(i); */
-+		if (au_iigen(i, NULL) == sigen)
-+			ii_read_lock_child(i);
-+		else {
-+			ii_write_lock_child(i);
-+			err = au_refresh_hinode_self(i);
-+			au_iigen_dec(i);
-+			if (!err)
-+				ii_downgrade_lock(i);
-+			else {
-+				ii_write_unlock(i);
-+				break;
-+			}
-+		}
-+
-+		bstart = au_ibstart(i);
-+		bend = au_ibend(i);
-+		if (bstart <= bindex
-+		    && bindex <= bend
-+		    && au_h_iptr(i, bindex)
-+		    && au_test_ibusy(i, bstart, bend)) {
-+			err = -EBUSY;
-+			AuVerbose(verbose, "busy i%lu\n", i->i_ino);
-+			AuDbgInode(i);
-+		}
-+		ii_read_unlock(i);
-+	}
-+	au_iarray_free(array, max);
-+
-+out:
-+	return err;
-+}
-+
-+static int test_children_busy(struct dentry *root, aufs_bindex_t bindex,
-+			      const unsigned int verbose)
-+{
-+	int err;
-+	unsigned int sigen;
-+
-+	sigen = au_sigen(root->d_sb);
-+	DiMustNoWaiters(root);
-+	IiMustNoWaiters(d_inode(root));
-+	di_write_unlock(root);
-+	err = test_dentry_busy(root, bindex, sigen, verbose);
-+	if (!err)
-+		err = test_inode_busy(root->d_sb, bindex, sigen, verbose);
-+	di_write_lock_child(root); /* aufs_write_lock() calls ..._child() */
-+
-+	return err;
-+}
-+
-+static int test_dir_busy(struct file *file, aufs_bindex_t br_id,
-+			 struct file **to_free, int *idx)
-+{
-+	int err;
-+	unsigned char matched, root;
-+	aufs_bindex_t bindex, bend;
-+	struct au_fidir *fidir;
-+	struct au_hfile *hfile;
-+
-+	err = 0;
-+	root = IS_ROOT(file->f_path.dentry);
-+	if (root) {
-+		get_file(file);
-+		to_free[*idx] = file;
-+		(*idx)++;
-+		goto out;
-+	}
-+
-+	matched = 0;
-+	fidir = au_fi(file)->fi_hdir;
-+	AuDebugOn(!fidir);
-+	bend = au_fbend_dir(file);
-+	for (bindex = au_fbstart(file); bindex <= bend; bindex++) {
-+		hfile = fidir->fd_hfile + bindex;
-+		if (!hfile->hf_file)
-+			continue;
-+
-+		if (hfile->hf_br->br_id == br_id) {
-+			matched = 1;
-+			break;
-+		}
-+	}
-+	if (matched)
-+		err = -EBUSY;
-+
-+out:
-+	return err;
-+}
-+
-+static int test_file_busy(struct super_block *sb, aufs_bindex_t br_id,
-+			  struct file **to_free, int opened)
-+{
-+	int err, idx;
-+	unsigned long long ull, max;
-+	aufs_bindex_t bstart;
-+	struct file *file, **array;
-+	struct dentry *root;
-+	struct au_hfile *hfile;
-+
-+	array = au_farray_alloc(sb, &max);
-+	err = PTR_ERR(array);
-+	if (IS_ERR(array))
-+		goto out;
-+
-+	err = 0;
-+	idx = 0;
-+	root = sb->s_root;
-+	di_write_unlock(root);
-+	for (ull = 0; ull < max; ull++) {
-+		file = array[ull];
-+		if (unlikely(!file))
-+			break;
-+
-+		/* AuDbg("%pD\n", file); */
-+		fi_read_lock(file);
-+		bstart = au_fbstart(file);
-+		if (!d_is_dir(file->f_path.dentry)) {
-+			hfile = &au_fi(file)->fi_htop;
-+			if (hfile->hf_br->br_id == br_id)
-+				err = -EBUSY;
-+		} else
-+			err = test_dir_busy(file, br_id, to_free, &idx);
-+		fi_read_unlock(file);
-+		if (unlikely(err))
-+			break;
-+	}
-+	di_write_lock_child(root);
-+	au_farray_free(array, max);
-+	AuDebugOn(idx > opened);
-+
-+out:
-+	return err;
-+}
-+
-+static void br_del_file(struct file **to_free, unsigned long long opened,
-+			  aufs_bindex_t br_id)
-+{
-+	unsigned long long ull;
-+	aufs_bindex_t bindex, bstart, bend, bfound;
-+	struct file *file;
-+	struct au_fidir *fidir;
-+	struct au_hfile *hfile;
-+
-+	for (ull = 0; ull < opened; ull++) {
-+		file = to_free[ull];
-+		if (unlikely(!file))
-+			break;
-+
-+		/* AuDbg("%pD\n", file); */
-+		AuDebugOn(!d_is_dir(file->f_path.dentry));
-+		bfound = -1;
-+		fidir = au_fi(file)->fi_hdir;
-+		AuDebugOn(!fidir);
-+		fi_write_lock(file);
-+		bstart = au_fbstart(file);
-+		bend = au_fbend_dir(file);
-+		for (bindex = bstart; bindex <= bend; bindex++) {
-+			hfile = fidir->fd_hfile + bindex;
-+			if (!hfile->hf_file)
-+				continue;
-+
-+			if (hfile->hf_br->br_id == br_id) {
-+				bfound = bindex;
-+				break;
-+			}
-+		}
-+		AuDebugOn(bfound < 0);
-+		au_set_h_fptr(file, bfound, NULL);
-+		if (bfound == bstart) {
-+			for (bstart++; bstart <= bend; bstart++)
-+				if (au_hf_dir(file, bstart)) {
-+					au_set_fbstart(file, bstart);
-+					break;
-+				}
-+		}
-+		fi_write_unlock(file);
-+	}
-+}
-+
-+static void au_br_do_del_brp(struct au_sbinfo *sbinfo,
-+			     const aufs_bindex_t bindex,
-+			     const aufs_bindex_t bend)
-+{
-+	struct au_branch **brp, **p;
-+
-+	AuRwMustWriteLock(&sbinfo->si_rwsem);
-+
-+	brp = sbinfo->si_branch + bindex;
-+	if (bindex < bend)
-+		memmove(brp, brp + 1, sizeof(*brp) * (bend - bindex));
-+	sbinfo->si_branch[0 + bend] = NULL;
-+	sbinfo->si_bend--;
-+
-+	p = krealloc(sbinfo->si_branch, sizeof(*p) * bend, AuGFP_SBILIST);
-+	if (p)
-+		sbinfo->si_branch = p;
-+	/* harmless error */
-+}
-+
-+static void au_br_do_del_hdp(struct au_dinfo *dinfo, const aufs_bindex_t bindex,
-+			     const aufs_bindex_t bend)
-+{
-+	struct au_hdentry *hdp, *p;
-+
-+	AuRwMustWriteLock(&dinfo->di_rwsem);
-+
-+	hdp = dinfo->di_hdentry;
-+	if (bindex < bend)
-+		memmove(hdp + bindex, hdp + bindex + 1,
-+			sizeof(*hdp) * (bend - bindex));
-+	hdp[0 + bend].hd_dentry = NULL;
-+	dinfo->di_bend--;
-+
-+	p = krealloc(hdp, sizeof(*p) * bend, AuGFP_SBILIST);
-+	if (p)
-+		dinfo->di_hdentry = p;
-+	/* harmless error */
-+}
-+
-+static void au_br_do_del_hip(struct au_iinfo *iinfo, const aufs_bindex_t bindex,
-+			     const aufs_bindex_t bend)
-+{
-+	struct au_hinode *hip, *p;
-+
-+	AuRwMustWriteLock(&iinfo->ii_rwsem);
-+
-+	hip = iinfo->ii_hinode + bindex;
-+	if (bindex < bend)
-+		memmove(hip, hip + 1, sizeof(*hip) * (bend - bindex));
-+	iinfo->ii_hinode[0 + bend].hi_inode = NULL;
-+	au_hn_init(iinfo->ii_hinode + bend);
-+	iinfo->ii_bend--;
-+
-+	p = krealloc(iinfo->ii_hinode, sizeof(*p) * bend, AuGFP_SBILIST);
-+	if (p)
-+		iinfo->ii_hinode = p;
-+	/* harmless error */
-+}
-+
-+static void au_br_do_del(struct super_block *sb, aufs_bindex_t bindex,
-+			 struct au_branch *br)
-+{
-+	aufs_bindex_t bend;
-+	struct au_sbinfo *sbinfo;
-+	struct dentry *root, *h_root;
-+	struct inode *inode, *h_inode;
-+	struct au_hinode *hinode;
-+
-+	SiMustWriteLock(sb);
-+
-+	root = sb->s_root;
-+	inode = d_inode(root);
-+	sbinfo = au_sbi(sb);
-+	bend = sbinfo->si_bend;
-+
-+	h_root = au_h_dptr(root, bindex);
-+	hinode = au_hi(inode, bindex);
-+	h_inode = au_igrab(hinode->hi_inode);
-+	au_hiput(hinode);
-+
-+	au_sbilist_lock();
-+	au_br_do_del_brp(sbinfo, bindex, bend);
-+	au_br_do_del_hdp(au_di(root), bindex, bend);
-+	au_br_do_del_hip(au_ii(inode), bindex, bend);
-+	au_sbilist_unlock();
-+
-+	dput(h_root);
-+	iput(h_inode);
-+	au_br_do_free(br);
-+}
-+
-+static unsigned long long empty_cb(void *array, unsigned long long max,
-+				   void *arg)
-+{
-+	return max;
-+}
-+
-+int au_br_del(struct super_block *sb, struct au_opt_del *del, int remount)
-+{
-+	int err, rerr, i;
-+	unsigned long long opened;
-+	unsigned int mnt_flags;
-+	aufs_bindex_t bindex, bend, br_id;
-+	unsigned char do_wh, verbose;
-+	struct au_branch *br;
-+	struct au_wbr *wbr;
-+	struct dentry *root;
-+	struct file **to_free;
-+
-+	err = 0;
-+	opened = 0;
-+	to_free = NULL;
-+	root = sb->s_root;
-+	bindex = au_find_dbindex(root, del->h_path.dentry);
-+	if (bindex < 0) {
-+		if (remount)
-+			goto out; /* success */
-+		err = -ENOENT;
-+		pr_err("%s no such branch\n", del->pathname);
-+		goto out;
-+	}
-+	AuDbg("bindex b%d\n", bindex);
-+
-+	err = -EBUSY;
-+	mnt_flags = au_mntflags(sb);
-+	verbose = !!au_opt_test(mnt_flags, VERBOSE);
-+	bend = au_sbend(sb);
-+	if (unlikely(!bend)) {
-+		AuVerbose(verbose, "no more branches left\n");
-+		goto out;
-+	}
-+	br = au_sbr(sb, bindex);
-+	AuDebugOn(!path_equal(&br->br_path, &del->h_path));
-+
-+	br_id = br->br_id;
-+	opened = atomic_read(&br->br_count);
-+	if (unlikely(opened)) {
-+		to_free = au_array_alloc(&opened, empty_cb, NULL);
-+		err = PTR_ERR(to_free);
-+		if (IS_ERR(to_free))
-+			goto out;
-+
-+		err = test_file_busy(sb, br_id, to_free, opened);
-+		if (unlikely(err)) {
-+			AuVerbose(verbose, "%llu file(s) opened\n", opened);
-+			goto out;
-+		}
-+	}
-+
-+	wbr = br->br_wbr;
-+	do_wh = wbr && (wbr->wbr_whbase || wbr->wbr_plink || wbr->wbr_orph);
-+	if (do_wh) {
-+		/* instead of WbrWhMustWriteLock(wbr) */
-+		SiMustWriteLock(sb);
-+		for (i = 0; i < AuBrWh_Last; i++) {
-+			dput(wbr->wbr_wh[i]);
-+			wbr->wbr_wh[i] = NULL;
-+		}
-+	}
-+
-+	err = test_children_busy(root, bindex, verbose);
-+	if (unlikely(err)) {
-+		if (do_wh)
-+			goto out_wh;
-+		goto out;
-+	}
-+
-+	err = 0;
-+	if (to_free) {
-+		/*
-+		 * now we confirmed the branch is deletable.
-+		 * let's free the remaining opened dirs on the branch.
-+		 */
-+		di_write_unlock(root);
-+		br_del_file(to_free, opened, br_id);
-+		di_write_lock_child(root);
-+	}
-+
-+	if (!remount)
-+		au_br_do_del(sb, bindex, br);
-+	else {
-+		sysaufs_brs_del(sb, bindex);
-+		au_br_do_del(sb, bindex, br);
-+		sysaufs_brs_add(sb, bindex);
-+	}
-+
-+	if (!bindex) {
-+		au_cpup_attr_all(d_inode(root), /*force*/1);
-+		sb->s_maxbytes = au_sbr_sb(sb, 0)->s_maxbytes;
-+	} else
-+		au_sub_nlink(d_inode(root), d_inode(del->h_path.dentry));
-+	if (au_opt_test(mnt_flags, PLINK))
-+		au_plink_half_refresh(sb, br_id);
-+
-+	if (au_xino_brid(sb) == br_id)
-+		au_xino_brid_set(sb, -1);
-+	goto out; /* success */
-+
-+out_wh:
-+	/* revert */
-+	rerr = au_br_init_wh(sb, br, br->br_perm);
-+	if (rerr)
-+		pr_warn("failed re-creating base whiteout, %s. (%d)\n",
-+			del->pathname, rerr);
-+out:
-+	if (to_free)
-+		au_farray_free(to_free, opened);
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static int au_ibusy(struct super_block *sb, struct aufs_ibusy __user *arg)
-+{
-+	int err;
-+	aufs_bindex_t bstart, bend;
-+	struct aufs_ibusy ibusy;
-+	struct inode *inode, *h_inode;
-+
-+	err = -EPERM;
-+	if (unlikely(!capable(CAP_SYS_ADMIN)))
-+		goto out;
-+
-+	err = copy_from_user(&ibusy, arg, sizeof(ibusy));
-+	if (!err)
-+		err = !access_ok(VERIFY_WRITE, &arg->h_ino, sizeof(arg->h_ino));
-+	if (unlikely(err)) {
-+		err = -EFAULT;
-+		AuTraceErr(err);
-+		goto out;
-+	}
-+
-+	err = -EINVAL;
-+	si_read_lock(sb, AuLock_FLUSH);
-+	if (unlikely(ibusy.bindex < 0 || ibusy.bindex > au_sbend(sb)))
-+		goto out_unlock;
-+
-+	err = 0;
-+	ibusy.h_ino = 0; /* invalid */
-+	inode = ilookup(sb, ibusy.ino);
-+	if (!inode
-+	    || inode->i_ino == AUFS_ROOT_INO
-+	    || is_bad_inode(inode))
-+		goto out_unlock;
-+
-+	ii_read_lock_child(inode);
-+	bstart = au_ibstart(inode);
-+	bend = au_ibend(inode);
-+	if (bstart <= ibusy.bindex && ibusy.bindex <= bend) {
-+		h_inode = au_h_iptr(inode, ibusy.bindex);
-+		if (h_inode && au_test_ibusy(inode, bstart, bend))
-+			ibusy.h_ino = h_inode->i_ino;
-+	}
-+	ii_read_unlock(inode);
-+	iput(inode);
-+
-+out_unlock:
-+	si_read_unlock(sb);
-+	if (!err) {
-+		err = __put_user(ibusy.h_ino, &arg->h_ino);
-+		if (unlikely(err)) {
-+			err = -EFAULT;
-+			AuTraceErr(err);
-+		}
-+	}
-+out:
-+	return err;
-+}
-+
-+long au_ibusy_ioctl(struct file *file, unsigned long arg)
-+{
-+	return au_ibusy(file->f_path.dentry->d_sb, (void __user *)arg);
-+}
-+
-+#ifdef CONFIG_COMPAT
-+long au_ibusy_compat_ioctl(struct file *file, unsigned long arg)
-+{
-+	return au_ibusy(file->f_path.dentry->d_sb, compat_ptr(arg));
-+}
-+#endif
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/*
-+ * change a branch permission
-+ */
-+
-+static void au_warn_ima(void)
-+{
-+#ifdef CONFIG_IMA
-+	/* since it doesn't support mark_files_ro() */
-+	AuWarn1("RW -> RO makes IMA to produce wrong message\n");
-+#endif
-+}
-+
-+static int do_need_sigen_inc(int a, int b)
-+{
-+	return au_br_whable(a) && !au_br_whable(b);
-+}
-+
-+static int need_sigen_inc(int old, int new)
-+{
-+	return do_need_sigen_inc(old, new)
-+		|| do_need_sigen_inc(new, old);
-+}
-+
-+static int au_br_mod_files_ro(struct super_block *sb, aufs_bindex_t bindex)
-+{
-+	int err, do_warn;
-+	unsigned int mnt_flags;
-+	unsigned long long ull, max;
-+	aufs_bindex_t br_id;
-+	unsigned char verbose, writer;
-+	struct file *file, *hf, **array;
-+	struct au_hfile *hfile;
-+
-+	mnt_flags = au_mntflags(sb);
-+	verbose = !!au_opt_test(mnt_flags, VERBOSE);
-+
-+	array = au_farray_alloc(sb, &max);
-+	err = PTR_ERR(array);
-+	if (IS_ERR(array))
-+		goto out;
-+
-+	do_warn = 0;
-+	br_id = au_sbr_id(sb, bindex);
-+	for (ull = 0; ull < max; ull++) {
-+		file = array[ull];
-+		if (unlikely(!file))
-+			break;
-+
-+		/* AuDbg("%pD\n", file); */
-+		fi_read_lock(file);
-+		if (unlikely(au_test_mmapped(file))) {
-+			err = -EBUSY;
-+			AuVerbose(verbose, "mmapped %pD\n", file);
-+			AuDbgFile(file);
-+			FiMustNoWaiters(file);
-+			fi_read_unlock(file);
-+			goto out_array;
-+		}
-+
-+		hfile = &au_fi(file)->fi_htop;
-+		hf = hfile->hf_file;
-+		if (!d_is_reg(file->f_path.dentry)
-+		    || !(file->f_mode & FMODE_WRITE)
-+		    || hfile->hf_br->br_id != br_id
-+		    || !(hf->f_mode & FMODE_WRITE))
-+			array[ull] = NULL;
-+		else {
-+			do_warn = 1;
-+			get_file(file);
-+		}
-+
-+		FiMustNoWaiters(file);
-+		fi_read_unlock(file);
-+		fput(file);
-+	}
-+
-+	err = 0;
-+	if (do_warn)
-+		au_warn_ima();
-+
-+	for (ull = 0; ull < max; ull++) {
-+		file = array[ull];
-+		if (!file)
-+			continue;
-+
-+		/* todo: already flushed? */
-+		/*
-+		 * fs/super.c:mark_files_ro() is gone, but aufs keeps its
-+		 * approach which resets f_mode and calls mnt_drop_write() and
-+		 * file_release_write() for each file, because the branch
-+		 * attribute in aufs world is totally different from the native
-+		 * fs rw/ro mode.
-+		*/
-+		/* fi_read_lock(file); */
-+		hfile = &au_fi(file)->fi_htop;
-+		hf = hfile->hf_file;
-+		/* fi_read_unlock(file); */
-+		spin_lock(&hf->f_lock);
-+		writer = !!(hf->f_mode & FMODE_WRITER);
-+		hf->f_mode &= ~(FMODE_WRITE | FMODE_WRITER);
-+		spin_unlock(&hf->f_lock);
-+		if (writer) {
-+			put_write_access(file_inode(hf));
-+			__mnt_drop_write(hf->f_path.mnt);
-+		}
-+	}
-+
-+out_array:
-+	au_farray_free(array, max);
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+int au_br_mod(struct super_block *sb, struct au_opt_mod *mod, int remount,
-+	      int *do_refresh)
-+{
-+	int err, rerr;
-+	aufs_bindex_t bindex;
-+	struct dentry *root;
-+	struct au_branch *br;
-+	struct au_br_fhsm *bf;
-+
-+	root = sb->s_root;
-+	bindex = au_find_dbindex(root, mod->h_root);
-+	if (bindex < 0) {
-+		if (remount)
-+			return 0; /* success */
-+		err = -ENOENT;
-+		pr_err("%s no such branch\n", mod->path);
-+		goto out;
-+	}
-+	AuDbg("bindex b%d\n", bindex);
-+
-+	err = test_br(d_inode(mod->h_root), mod->perm, mod->path);
-+	if (unlikely(err))
-+		goto out;
-+
-+	br = au_sbr(sb, bindex);
-+	AuDebugOn(mod->h_root != au_br_dentry(br));
-+	if (br->br_perm == mod->perm)
-+		return 0; /* success */
-+
-+	/* pre-allocate for non-fhsm --> fhsm */
-+	bf = NULL;
-+	if (!au_br_fhsm(br->br_perm) && au_br_fhsm(mod->perm)) {
-+		err = au_fhsm_br_alloc(br);
-+		if (unlikely(err))
-+			goto out;
-+		bf = br->br_fhsm;
-+		br->br_fhsm = NULL;
-+	}
-+
-+	if (au_br_writable(br->br_perm)) {
-+		/* remove whiteout base */
-+		err = au_br_init_wh(sb, br, mod->perm);
-+		if (unlikely(err))
-+			goto out_bf;
-+
-+		if (!au_br_writable(mod->perm)) {
-+			/* rw --> ro, file might be mmapped */
-+			DiMustNoWaiters(root);
-+			IiMustNoWaiters(d_inode(root));
-+			di_write_unlock(root);
-+			err = au_br_mod_files_ro(sb, bindex);
-+			/* aufs_write_lock() calls ..._child() */
-+			di_write_lock_child(root);
-+
-+			if (unlikely(err)) {
-+				rerr = -ENOMEM;
-+				br->br_wbr = kmalloc(sizeof(*br->br_wbr),
-+						     GFP_NOFS);
-+				if (br->br_wbr)
-+					rerr = au_wbr_init(br, sb, br->br_perm);
-+				if (unlikely(rerr)) {
-+					AuIOErr("nested error %d (%d)\n",
-+						rerr, err);
-+					br->br_perm = mod->perm;
-+				}
-+			}
-+		}
-+	} else if (au_br_writable(mod->perm)) {
-+		/* ro --> rw */
-+		err = -ENOMEM;
-+		br->br_wbr = kmalloc(sizeof(*br->br_wbr), GFP_NOFS);
-+		if (br->br_wbr) {
-+			err = au_wbr_init(br, sb, mod->perm);
-+			if (unlikely(err)) {
-+				kfree(br->br_wbr);
-+				br->br_wbr = NULL;
-+			}
-+		}
-+	}
-+	if (unlikely(err))
-+		goto out_bf;
-+
-+	if (au_br_fhsm(br->br_perm)) {
-+		if (!au_br_fhsm(mod->perm)) {
-+			/* fhsm --> non-fhsm */
-+			au_br_fhsm_fin(br->br_fhsm);
-+			kfree(br->br_fhsm);
-+			br->br_fhsm = NULL;
-+		}
-+	} else if (au_br_fhsm(mod->perm))
-+		/* non-fhsm --> fhsm */
-+		br->br_fhsm = bf;
-+
-+	*do_refresh |= need_sigen_inc(br->br_perm, mod->perm);
-+	br->br_perm = mod->perm;
-+	goto out; /* success */
-+
-+out_bf:
-+	kfree(bf);
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+int au_br_stfs(struct au_branch *br, struct aufs_stfs *stfs)
-+{
-+	int err;
-+	struct kstatfs kstfs;
-+
-+	err = vfs_statfs(&br->br_path, &kstfs);
-+	if (!err) {
-+		stfs->f_blocks = kstfs.f_blocks;
-+		stfs->f_bavail = kstfs.f_bavail;
-+		stfs->f_files = kstfs.f_files;
-+		stfs->f_ffree = kstfs.f_ffree;
-+	}
-+
-+	return err;
-+}
-diff -Nur linux-4.1.10.orig/fs/aufs/branch.h linux-4.1.10/fs/aufs/branch.h
---- linux-4.1.10.orig/fs/aufs/branch.h	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/branch.h	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,279 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * branch filesystems and xino for them
-+ */
-+
-+#ifndef __AUFS_BRANCH_H__
-+#define __AUFS_BRANCH_H__
-+
-+#ifdef __KERNEL__
-+
-+#include <linux/mount.h>
-+#include "dynop.h"
-+#include "rwsem.h"
-+#include "super.h"
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* a xino file */
-+struct au_xino_file {
-+	struct file		*xi_file;
-+	struct mutex		xi_nondir_mtx;
-+
-+	/* todo: make xino files an array to support huge inode number */
-+
-+#ifdef CONFIG_DEBUG_FS
-+	struct dentry		 *xi_dbgaufs;
-+#endif
-+};
-+
-+/* File-based Hierarchical Storage Management */
-+struct au_br_fhsm {
-+#ifdef CONFIG_AUFS_FHSM
-+	struct mutex		bf_lock;
-+	unsigned long		bf_jiffy;
-+	struct aufs_stfs	bf_stfs;
-+	int			bf_readable;
-+#endif
-+};
-+
-+/* members for writable branch only */
-+enum {AuBrWh_BASE, AuBrWh_PLINK, AuBrWh_ORPH, AuBrWh_Last};
-+struct au_wbr {
-+	struct au_rwsem		wbr_wh_rwsem;
-+	struct dentry		*wbr_wh[AuBrWh_Last];
-+	atomic_t		wbr_wh_running;
-+#define wbr_whbase		wbr_wh[AuBrWh_BASE]	/* whiteout base */
-+#define wbr_plink		wbr_wh[AuBrWh_PLINK]	/* pseudo-link dir */
-+#define wbr_orph		wbr_wh[AuBrWh_ORPH]	/* dir for orphans */
-+
-+	/* mfs mode */
-+	unsigned long long	wbr_bytes;
-+};
-+
-+/* ext2 has 3 types of operations at least, ext3 has 4 */
-+#define AuBrDynOp (AuDyLast * 4)
-+
-+#ifdef CONFIG_AUFS_HFSNOTIFY
-+/* support for asynchronous destruction */
-+struct au_br_hfsnotify {
-+	struct fsnotify_group	*hfsn_group;
-+};
-+#endif
-+
-+/* sysfs entries */
-+struct au_brsysfs {
-+	char			name[16];
-+	struct attribute	attr;
-+};
-+
-+enum {
-+	AuBrSysfs_BR,
-+	AuBrSysfs_BRID,
-+	AuBrSysfs_Last
-+};
-+
-+/* protected by superblock rwsem */
-+struct au_branch {
-+	struct au_xino_file	br_xino;
-+
-+	aufs_bindex_t		br_id;
-+
-+	int			br_perm;
-+	struct path		br_path;
-+	spinlock_t		br_dykey_lock;
-+	struct au_dykey		*br_dykey[AuBrDynOp];
-+	atomic_t		br_count;
-+
-+	struct au_wbr		*br_wbr;
-+	struct au_br_fhsm	*br_fhsm;
-+
-+	/* xino truncation */
-+	atomic_t		br_xino_running;
-+
-+#ifdef CONFIG_AUFS_HFSNOTIFY
-+	struct au_br_hfsnotify	*br_hfsn;
-+#endif
-+
-+#ifdef CONFIG_SYSFS
-+	/* entries under sysfs per mount-point */
-+	struct au_brsysfs	br_sysfs[AuBrSysfs_Last];
-+#endif
-+};
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static inline struct vfsmount *au_br_mnt(struct au_branch *br)
-+{
-+	return br->br_path.mnt;
-+}
-+
-+static inline struct dentry *au_br_dentry(struct au_branch *br)
-+{
-+	return br->br_path.dentry;
-+}
-+
-+static inline struct super_block *au_br_sb(struct au_branch *br)
-+{
-+	return au_br_mnt(br)->mnt_sb;
-+}
-+
-+static inline int au_br_rdonly(struct au_branch *br)
-+{
-+	return ((au_br_sb(br)->s_flags & MS_RDONLY)
-+		|| !au_br_writable(br->br_perm))
-+		? -EROFS : 0;
-+}
-+
-+static inline int au_br_hnotifyable(int brperm __maybe_unused)
-+{
-+#ifdef CONFIG_AUFS_HNOTIFY
-+	return !(brperm & AuBrPerm_RR);
-+#else
-+	return 0;
-+#endif
-+}
-+
-+static inline int au_br_test_oflag(int oflag, struct au_branch *br)
-+{
-+	int err, exec_flag;
-+
-+	err = 0;
-+	exec_flag = oflag & __FMODE_EXEC;
-+	if (unlikely(exec_flag && (au_br_mnt(br)->mnt_flags & MNT_NOEXEC)))
-+		err = -EACCES;
-+
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* branch.c */
-+struct au_sbinfo;
-+void au_br_free(struct au_sbinfo *sinfo);
-+int au_br_index(struct super_block *sb, aufs_bindex_t br_id);
-+struct au_opt_add;
-+int au_br_add(struct super_block *sb, struct au_opt_add *add, int remount);
-+struct au_opt_del;
-+int au_br_del(struct super_block *sb, struct au_opt_del *del, int remount);
-+long au_ibusy_ioctl(struct file *file, unsigned long arg);
-+#ifdef CONFIG_COMPAT
-+long au_ibusy_compat_ioctl(struct file *file, unsigned long arg);
-+#endif
-+struct au_opt_mod;
-+int au_br_mod(struct super_block *sb, struct au_opt_mod *mod, int remount,
-+	      int *do_refresh);
-+struct aufs_stfs;
-+int au_br_stfs(struct au_branch *br, struct aufs_stfs *stfs);
-+
-+/* xino.c */
-+static const loff_t au_loff_max = LLONG_MAX;
-+
-+int au_xib_trunc(struct super_block *sb);
-+ssize_t xino_fread(vfs_readf_t func, struct file *file, void *buf, size_t size,
-+		   loff_t *pos);
-+ssize_t xino_fwrite(vfs_writef_t func, struct file *file, void *buf,
-+		    size_t size, loff_t *pos);
-+struct file *au_xino_create2(struct file *base_file, struct file *copy_src);
-+struct file *au_xino_create(struct super_block *sb, char *fname, int silent);
-+ino_t au_xino_new_ino(struct super_block *sb);
-+void au_xino_delete_inode(struct inode *inode, const int unlinked);
-+int au_xino_write(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
-+		  ino_t ino);
-+int au_xino_read(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
-+		 ino_t *ino);
-+int au_xino_br(struct super_block *sb, struct au_branch *br, ino_t hino,
-+	       struct file *base_file, int do_test);
-+int au_xino_trunc(struct super_block *sb, aufs_bindex_t bindex);
-+
-+struct au_opt_xino;
-+int au_xino_set(struct super_block *sb, struct au_opt_xino *xino, int remount);
-+void au_xino_clr(struct super_block *sb);
-+struct file *au_xino_def(struct super_block *sb);
-+int au_xino_path(struct seq_file *seq, struct file *file);
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* Superblock to branch */
-+static inline
-+aufs_bindex_t au_sbr_id(struct super_block *sb, aufs_bindex_t bindex)
-+{
-+	return au_sbr(sb, bindex)->br_id;
-+}
-+
-+static inline
-+struct vfsmount *au_sbr_mnt(struct super_block *sb, aufs_bindex_t bindex)
-+{
-+	return au_br_mnt(au_sbr(sb, bindex));
-+}
-+
-+static inline
-+struct super_block *au_sbr_sb(struct super_block *sb, aufs_bindex_t bindex)
-+{
-+	return au_br_sb(au_sbr(sb, bindex));
-+}
-+
-+static inline void au_sbr_put(struct super_block *sb, aufs_bindex_t bindex)
-+{
-+	atomic_dec(&au_sbr(sb, bindex)->br_count);
-+}
-+
-+static inline int au_sbr_perm(struct super_block *sb, aufs_bindex_t bindex)
-+{
-+	return au_sbr(sb, bindex)->br_perm;
-+}
-+
-+static inline int au_sbr_whable(struct super_block *sb, aufs_bindex_t bindex)
-+{
-+	return au_br_whable(au_sbr_perm(sb, bindex));
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/*
-+ * wbr_wh_read_lock, wbr_wh_write_lock
-+ * wbr_wh_read_unlock, wbr_wh_write_unlock, wbr_wh_downgrade_lock
-+ */
-+AuSimpleRwsemFuncs(wbr_wh, struct au_wbr *wbr, &wbr->wbr_wh_rwsem);
-+
-+#define WbrWhMustNoWaiters(wbr)	AuRwMustNoWaiters(&wbr->wbr_wh_rwsem)
-+#define WbrWhMustAnyLock(wbr)	AuRwMustAnyLock(&wbr->wbr_wh_rwsem)
-+#define WbrWhMustWriteLock(wbr)	AuRwMustWriteLock(&wbr->wbr_wh_rwsem)
-+
-+/* ---------------------------------------------------------------------- */
-+
-+#ifdef CONFIG_AUFS_FHSM
-+static inline void au_br_fhsm_init(struct au_br_fhsm *brfhsm)
-+{
-+	mutex_init(&brfhsm->bf_lock);
-+	brfhsm->bf_jiffy = 0;
-+	brfhsm->bf_readable = 0;
-+}
-+
-+static inline void au_br_fhsm_fin(struct au_br_fhsm *brfhsm)
-+{
-+	mutex_destroy(&brfhsm->bf_lock);
-+}
-+#else
-+AuStubVoid(au_br_fhsm_init, struct au_br_fhsm *brfhsm)
-+AuStubVoid(au_br_fhsm_fin, struct au_br_fhsm *brfhsm)
-+#endif
-+
-+#endif /* __KERNEL__ */
-+#endif /* __AUFS_BRANCH_H__ */
-diff -Nur linux-4.1.10.orig/fs/aufs/conf.mk linux-4.1.10/fs/aufs/conf.mk
---- linux-4.1.10.orig/fs/aufs/conf.mk	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/conf.mk	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,38 @@
-+
-+AuConfStr = CONFIG_AUFS_FS=${CONFIG_AUFS_FS}
-+
-+define AuConf
-+ifdef ${1}
-+AuConfStr += ${1}=${${1}}
-+endif
-+endef
-+
-+AuConfAll = BRANCH_MAX_127 BRANCH_MAX_511 BRANCH_MAX_1023 BRANCH_MAX_32767 \
-+	SBILIST \
-+	HNOTIFY HFSNOTIFY \
-+	EXPORT INO_T_64 \
-+	XATTR \
-+	FHSM \
-+	RDU \
-+	SHWH \
-+	BR_RAMFS \
-+	BR_FUSE POLL \
-+	BR_HFSPLUS \
-+	BDEV_LOOP \
-+	DEBUG MAGIC_SYSRQ
-+$(foreach i, ${AuConfAll}, \
-+	$(eval $(call AuConf,CONFIG_AUFS_${i})))
-+
-+AuConfName = ${obj}/conf.str
-+${AuConfName}.tmp: FORCE
-+	@echo ${AuConfStr} | tr ' ' '\n' | sed -e 's/^/"/' -e 's/$$/\\n"/' > $@
-+${AuConfName}: ${AuConfName}.tmp
-+	@diff -q $< $@ > /dev/null 2>&1 || { \
-+	echo '  GEN    ' $@; \
-+	cp -p $< $@; \
-+	}
-+FORCE:
-+clean-files += ${AuConfName} ${AuConfName}.tmp
-+${obj}/sysfs.o: ${AuConfName}
-+
-+-include ${srctree}/${src}/conf_priv.mk
-diff -Nur linux-4.1.10.orig/fs/aufs/cpup.c linux-4.1.10/fs/aufs/cpup.c
---- linux-4.1.10.orig/fs/aufs/cpup.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/cpup.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,1319 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * copy-up functions, see wbr_policy.c for copy-down
-+ */
-+
-+#include <linux/fs_stack.h>
-+#include <linux/mm.h>
-+#include "aufs.h"
-+
-+void au_cpup_attr_flags(struct inode *dst, unsigned int iflags)
-+{
-+	const unsigned int mask = S_DEAD | S_SWAPFILE | S_PRIVATE
-+		| S_NOATIME | S_NOCMTIME | S_AUTOMOUNT;
-+
-+	BUILD_BUG_ON(sizeof(iflags) != sizeof(dst->i_flags));
-+
-+	dst->i_flags |= iflags & ~mask;
-+	if (au_test_fs_notime(dst->i_sb))
-+		dst->i_flags |= S_NOATIME | S_NOCMTIME;
-+}
-+
-+void au_cpup_attr_timesizes(struct inode *inode)
-+{
-+	struct inode *h_inode;
-+
-+	h_inode = au_h_iptr(inode, au_ibstart(inode));
-+	fsstack_copy_attr_times(inode, h_inode);
-+	fsstack_copy_inode_size(inode, h_inode);
-+}
-+
-+void au_cpup_attr_nlink(struct inode *inode, int force)
-+{
-+	struct inode *h_inode;
-+	struct super_block *sb;
-+	aufs_bindex_t bindex, bend;
-+
-+	sb = inode->i_sb;
-+	bindex = au_ibstart(inode);
-+	h_inode = au_h_iptr(inode, bindex);
-+	if (!force
-+	    && !S_ISDIR(h_inode->i_mode)
-+	    && au_opt_test(au_mntflags(sb), PLINK)
-+	    && au_plink_test(inode))
-+		return;
-+
-+	/*
-+	 * 0 can happen in revalidating.
-+	 * h_inode->i_mutex may not be held here, but it is harmless since once
-+	 * i_nlink reaches 0, it will never become positive except O_TMPFILE
-+	 * case.
-+	 * todo: O_TMPFILE+linkat(AT_SYMLINK_FOLLOW) bypassing aufs may cause
-+	 *	 the incorrect link count.
-+	 */
-+	set_nlink(inode, h_inode->i_nlink);
-+
-+	/*
-+	 * fewer nlink makes find(1) noisy, but larger nlink doesn't.
-+	 * it may includes whplink directory.
-+	 */
-+	if (S_ISDIR(h_inode->i_mode)) {
-+		bend = au_ibend(inode);
-+		for (bindex++; bindex <= bend; bindex++) {
-+			h_inode = au_h_iptr(inode, bindex);
-+			if (h_inode)
-+				au_add_nlink(inode, h_inode);
-+		}
-+	}
-+}
-+
-+void au_cpup_attr_changeable(struct inode *inode)
-+{
-+	struct inode *h_inode;
-+
-+	h_inode = au_h_iptr(inode, au_ibstart(inode));
-+	inode->i_mode = h_inode->i_mode;
-+	inode->i_uid = h_inode->i_uid;
-+	inode->i_gid = h_inode->i_gid;
-+	au_cpup_attr_timesizes(inode);
-+	au_cpup_attr_flags(inode, h_inode->i_flags);
-+}
-+
-+void au_cpup_igen(struct inode *inode, struct inode *h_inode)
-+{
-+	struct au_iinfo *iinfo = au_ii(inode);
-+
-+	IiMustWriteLock(inode);
-+
-+	iinfo->ii_higen = h_inode->i_generation;
-+	iinfo->ii_hsb1 = h_inode->i_sb;
-+}
-+
-+void au_cpup_attr_all(struct inode *inode, int force)
-+{
-+	struct inode *h_inode;
-+
-+	h_inode = au_h_iptr(inode, au_ibstart(inode));
-+	au_cpup_attr_changeable(inode);
-+	if (inode->i_nlink > 0)
-+		au_cpup_attr_nlink(inode, force);
-+	inode->i_rdev = h_inode->i_rdev;
-+	inode->i_blkbits = h_inode->i_blkbits;
-+	au_cpup_igen(inode, h_inode);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* Note: dt_dentry and dt_h_dentry are not dget/dput-ed */
-+
-+/* keep the timestamps of the parent dir when cpup */
-+void au_dtime_store(struct au_dtime *dt, struct dentry *dentry,
-+		    struct path *h_path)
-+{
-+	struct inode *h_inode;
-+
-+	dt->dt_dentry = dentry;
-+	dt->dt_h_path = *h_path;
-+	h_inode = d_inode(h_path->dentry);
-+	dt->dt_atime = h_inode->i_atime;
-+	dt->dt_mtime = h_inode->i_mtime;
-+	/* smp_mb(); */
-+}
-+
-+void au_dtime_revert(struct au_dtime *dt)
-+{
-+	struct iattr attr;
-+	int err;
-+
-+	attr.ia_atime = dt->dt_atime;
-+	attr.ia_mtime = dt->dt_mtime;
-+	attr.ia_valid = ATTR_FORCE | ATTR_MTIME | ATTR_MTIME_SET
-+		| ATTR_ATIME | ATTR_ATIME_SET;
-+
-+	/* no delegation since this is a directory */
-+	err = vfsub_notify_change(&dt->dt_h_path, &attr, /*delegated*/NULL);
-+	if (unlikely(err))
-+		pr_warn("restoring timestamps failed(%d). ignored\n", err);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* internal use only */
-+struct au_cpup_reg_attr {
-+	int		valid;
-+	struct kstat	st;
-+	unsigned int	iflags; /* inode->i_flags */
-+};
-+
-+static noinline_for_stack
-+int cpup_iattr(struct dentry *dst, aufs_bindex_t bindex, struct dentry *h_src,
-+	       struct au_cpup_reg_attr *h_src_attr)
-+{
-+	int err, sbits, icex;
-+	unsigned int mnt_flags;
-+	unsigned char verbose;
-+	struct iattr ia;
-+	struct path h_path;
-+	struct inode *h_isrc, *h_idst;
-+	struct kstat *h_st;
-+	struct au_branch *br;
-+
-+	h_path.dentry = au_h_dptr(dst, bindex);
-+	h_idst = d_inode(h_path.dentry);
-+	br = au_sbr(dst->d_sb, bindex);
-+	h_path.mnt = au_br_mnt(br);
-+	h_isrc = d_inode(h_src);
-+	ia.ia_valid = ATTR_FORCE | ATTR_UID | ATTR_GID
-+		| ATTR_ATIME | ATTR_MTIME
-+		| ATTR_ATIME_SET | ATTR_MTIME_SET;
-+	if (h_src_attr && h_src_attr->valid) {
-+		h_st = &h_src_attr->st;
-+		ia.ia_uid = h_st->uid;
-+		ia.ia_gid = h_st->gid;
-+		ia.ia_atime = h_st->atime;
-+		ia.ia_mtime = h_st->mtime;
-+		if (h_idst->i_mode != h_st->mode
-+		    && !S_ISLNK(h_idst->i_mode)) {
-+			ia.ia_valid |= ATTR_MODE;
-+			ia.ia_mode = h_st->mode;
-+		}
-+		sbits = !!(h_st->mode & (S_ISUID | S_ISGID));
-+		au_cpup_attr_flags(h_idst, h_src_attr->iflags);
-+	} else {
-+		ia.ia_uid = h_isrc->i_uid;
-+		ia.ia_gid = h_isrc->i_gid;
-+		ia.ia_atime = h_isrc->i_atime;
-+		ia.ia_mtime = h_isrc->i_mtime;
-+		if (h_idst->i_mode != h_isrc->i_mode
-+		    && !S_ISLNK(h_idst->i_mode)) {
-+			ia.ia_valid |= ATTR_MODE;
-+			ia.ia_mode = h_isrc->i_mode;
-+		}
-+		sbits = !!(h_isrc->i_mode & (S_ISUID | S_ISGID));
-+		au_cpup_attr_flags(h_idst, h_isrc->i_flags);
-+	}
-+	/* no delegation since it is just created */
-+	err = vfsub_notify_change(&h_path, &ia, /*delegated*/NULL);
-+
-+	/* is this nfs only? */
-+	if (!err && sbits && au_test_nfs(h_path.dentry->d_sb)) {
-+		ia.ia_valid = ATTR_FORCE | ATTR_MODE;
-+		ia.ia_mode = h_isrc->i_mode;
-+		err = vfsub_notify_change(&h_path, &ia, /*delegated*/NULL);
-+	}
-+
-+	icex = br->br_perm & AuBrAttr_ICEX;
-+	if (!err) {
-+		mnt_flags = au_mntflags(dst->d_sb);
-+		verbose = !!au_opt_test(mnt_flags, VERBOSE);
-+		err = au_cpup_xattr(h_path.dentry, h_src, icex, verbose);
-+	}
-+
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static int au_do_copy_file(struct file *dst, struct file *src, loff_t len,
-+			   char *buf, unsigned long blksize)
-+{
-+	int err;
-+	size_t sz, rbytes, wbytes;
-+	unsigned char all_zero;
-+	char *p, *zp;
-+	struct mutex *h_mtx;
-+	/* reduce stack usage */
-+	struct iattr *ia;
-+
-+	zp = page_address(ZERO_PAGE(0));
-+	if (unlikely(!zp))
-+		return -ENOMEM; /* possible? */
-+
-+	err = 0;
-+	all_zero = 0;
-+	while (len) {
-+		AuDbg("len %lld\n", len);
-+		sz = blksize;
-+		if (len < blksize)
-+			sz = len;
-+
-+		rbytes = 0;
-+		/* todo: signal_pending? */
-+		while (!rbytes || err == -EAGAIN || err == -EINTR) {
-+			rbytes = vfsub_read_k(src, buf, sz, &src->f_pos);
-+			err = rbytes;
-+		}
-+		if (unlikely(err < 0))
-+			break;
-+
-+		all_zero = 0;
-+		if (len >= rbytes && rbytes == blksize)
-+			all_zero = !memcmp(buf, zp, rbytes);
-+		if (!all_zero) {
-+			wbytes = rbytes;
-+			p = buf;
-+			while (wbytes) {
-+				size_t b;
-+
-+				b = vfsub_write_k(dst, p, wbytes, &dst->f_pos);
-+				err = b;
-+				/* todo: signal_pending? */
-+				if (unlikely(err == -EAGAIN || err == -EINTR))
-+					continue;
-+				if (unlikely(err < 0))
-+					break;
-+				wbytes -= b;
-+				p += b;
-+			}
-+			if (unlikely(err < 0))
-+				break;
-+		} else {
-+			loff_t res;
-+
-+			AuLabel(hole);
-+			res = vfsub_llseek(dst, rbytes, SEEK_CUR);
-+			err = res;
-+			if (unlikely(res < 0))
-+				break;
-+		}
-+		len -= rbytes;
-+		err = 0;
-+	}
-+
-+	/* the last block may be a hole */
-+	if (!err && all_zero) {
-+		AuLabel(last hole);
-+
-+		err = 1;
-+		if (au_test_nfs(dst->f_path.dentry->d_sb)) {
-+			/* nfs requires this step to make last hole */
-+			/* is this only nfs? */
-+			do {
-+				/* todo: signal_pending? */
-+				err = vfsub_write_k(dst, "\0", 1, &dst->f_pos);
-+			} while (err == -EAGAIN || err == -EINTR);
-+			if (err == 1)
-+				dst->f_pos--;
-+		}
-+
-+		if (err == 1) {
-+			ia = (void *)buf;
-+			ia->ia_size = dst->f_pos;
-+			ia->ia_valid = ATTR_SIZE | ATTR_FILE;
-+			ia->ia_file = dst;
-+			h_mtx = &file_inode(dst)->i_mutex;
-+			mutex_lock_nested(h_mtx, AuLsc_I_CHILD2);
-+			/* no delegation since it is just created */
-+			err = vfsub_notify_change(&dst->f_path, ia,
-+						  /*delegated*/NULL);
-+			mutex_unlock(h_mtx);
-+		}
-+	}
-+
-+	return err;
-+}
-+
-+int au_copy_file(struct file *dst, struct file *src, loff_t len)
-+{
-+	int err;
-+	unsigned long blksize;
-+	unsigned char do_kfree;
-+	char *buf;
-+
-+	err = -ENOMEM;
-+	blksize = dst->f_path.dentry->d_sb->s_blocksize;
-+	if (!blksize || PAGE_SIZE < blksize)
-+		blksize = PAGE_SIZE;
-+	AuDbg("blksize %lu\n", blksize);
-+	do_kfree = (blksize != PAGE_SIZE && blksize >= sizeof(struct iattr *));
-+	if (do_kfree)
-+		buf = kmalloc(blksize, GFP_NOFS);
-+	else
-+		buf = (void *)__get_free_page(GFP_NOFS);
-+	if (unlikely(!buf))
-+		goto out;
-+
-+	if (len > (1 << 22))
-+		AuDbg("copying a large file %lld\n", (long long)len);
-+
-+	src->f_pos = 0;
-+	dst->f_pos = 0;
-+	err = au_do_copy_file(dst, src, len, buf, blksize);
-+	if (do_kfree)
-+		kfree(buf);
-+	else
-+		free_page((unsigned long)buf);
-+
-+out:
-+	return err;
-+}
-+
-+/*
-+ * to support a sparse file which is opened with O_APPEND,
-+ * we need to close the file.
-+ */
-+static int au_cp_regular(struct au_cp_generic *cpg)
-+{
-+	int err, i;
-+	enum { SRC, DST };
-+	struct {
-+		aufs_bindex_t bindex;
-+		unsigned int flags;
-+		struct dentry *dentry;
-+		int force_wr;
-+		struct file *file;
-+		void *label;
-+	} *f, file[] = {
-+		{
-+			.bindex = cpg->bsrc,
-+			.flags = O_RDONLY | O_NOATIME | O_LARGEFILE,
-+			.label = &&out
-+		},
-+		{
-+			.bindex = cpg->bdst,
-+			.flags = O_WRONLY | O_NOATIME | O_LARGEFILE,
-+			.force_wr = !!au_ftest_cpup(cpg->flags, RWDST),
-+			.label = &&out_src
-+		}
-+	};
-+	struct super_block *sb;
-+
-+	/* bsrc branch can be ro/rw. */
-+	sb = cpg->dentry->d_sb;
-+	f = file;
-+	for (i = 0; i < 2; i++, f++) {
-+		f->dentry = au_h_dptr(cpg->dentry, f->bindex);
-+		f->file = au_h_open(cpg->dentry, f->bindex, f->flags,
-+				    /*file*/NULL, f->force_wr);
-+		err = PTR_ERR(f->file);
-+		if (IS_ERR(f->file))
-+			goto *f->label;
-+	}
-+
-+	/* try stopping to update while we copyup */
-+	IMustLock(d_inode(file[SRC].dentry));
-+	err = au_copy_file(file[DST].file, file[SRC].file, cpg->len);
-+
-+	fput(file[DST].file);
-+	au_sbr_put(sb, file[DST].bindex);
-+
-+out_src:
-+	fput(file[SRC].file);
-+	au_sbr_put(sb, file[SRC].bindex);
-+out:
-+	return err;
-+}
-+
-+static int au_do_cpup_regular(struct au_cp_generic *cpg,
-+			      struct au_cpup_reg_attr *h_src_attr)
-+{
-+	int err, rerr;
-+	loff_t l;
-+	struct path h_path;
-+	struct inode *h_src_inode, *h_dst_inode;
-+
-+	err = 0;
-+	h_src_inode = au_h_iptr(d_inode(cpg->dentry), cpg->bsrc);
-+	l = i_size_read(h_src_inode);
-+	if (cpg->len == -1 || l < cpg->len)
-+		cpg->len = l;
-+	if (cpg->len) {
-+		/* try stopping to update while we are referencing */
-+		mutex_lock_nested(&h_src_inode->i_mutex, AuLsc_I_CHILD);
-+		au_pin_hdir_unlock(cpg->pin);
-+
-+		h_path.dentry = au_h_dptr(cpg->dentry, cpg->bsrc);
-+		h_path.mnt = au_sbr_mnt(cpg->dentry->d_sb, cpg->bsrc);
-+		h_src_attr->iflags = h_src_inode->i_flags;
-+		if (!au_test_nfs(h_src_inode->i_sb))
-+			err = vfs_getattr(&h_path, &h_src_attr->st);
-+		else {
-+			mutex_unlock(&h_src_inode->i_mutex);
-+			err = vfs_getattr(&h_path, &h_src_attr->st);
-+			mutex_lock_nested(&h_src_inode->i_mutex, AuLsc_I_CHILD);
-+		}
-+		if (unlikely(err)) {
-+			mutex_unlock(&h_src_inode->i_mutex);
-+			goto out;
-+		}
-+		h_src_attr->valid = 1;
-+		err = au_cp_regular(cpg);
-+		mutex_unlock(&h_src_inode->i_mutex);
-+		rerr = au_pin_hdir_relock(cpg->pin);
-+		if (!err && rerr)
-+			err = rerr;
-+	}
-+	if (!err && (h_src_inode->i_state & I_LINKABLE)) {
-+		h_path.dentry = au_h_dptr(cpg->dentry, cpg->bdst);
-+		h_dst_inode = d_inode(h_path.dentry);
-+		spin_lock(&h_dst_inode->i_lock);
-+		h_dst_inode->i_state |= I_LINKABLE;
-+		spin_unlock(&h_dst_inode->i_lock);
-+	}
-+
-+out:
-+	return err;
-+}
-+
-+static int au_do_cpup_symlink(struct path *h_path, struct dentry *h_src,
-+			      struct inode *h_dir)
-+{
-+	int err, symlen;
-+	mm_segment_t old_fs;
-+	union {
-+		char *k;
-+		char __user *u;
-+	} sym;
-+	struct inode *h_inode = d_inode(h_src);
-+	const struct inode_operations *h_iop = h_inode->i_op;
-+
-+	err = -ENOSYS;
-+	if (unlikely(!h_iop->readlink))
-+		goto out;
-+
-+	err = -ENOMEM;
-+	sym.k = (void *)__get_free_page(GFP_NOFS);
-+	if (unlikely(!sym.k))
-+		goto out;
-+
-+	/* unnecessary to support mmap_sem since symlink is not mmap-able */
-+	old_fs = get_fs();
-+	set_fs(KERNEL_DS);
-+	symlen = h_iop->readlink(h_src, sym.u, PATH_MAX);
-+	err = symlen;
-+	set_fs(old_fs);
-+
-+	if (symlen > 0) {
-+		sym.k[symlen] = 0;
-+		err = vfsub_symlink(h_dir, h_path, sym.k);
-+	}
-+	free_page((unsigned long)sym.k);
-+
-+out:
-+	return err;
-+}
-+
-+static noinline_for_stack
-+int cpup_entry(struct au_cp_generic *cpg, struct dentry *dst_parent,
-+	       struct au_cpup_reg_attr *h_src_attr)
-+{
-+	int err;
-+	umode_t mode;
-+	unsigned int mnt_flags;
-+	unsigned char isdir, isreg, force;
-+	const unsigned char do_dt = !!au_ftest_cpup(cpg->flags, DTIME);
-+	struct au_dtime dt;
-+	struct path h_path;
-+	struct dentry *h_src, *h_dst, *h_parent;
-+	struct inode *h_inode, *h_dir, *dir, *inode;
-+	struct super_block *sb;
-+
-+	/* bsrc branch can be ro/rw. */
-+	h_src = au_h_dptr(cpg->dentry, cpg->bsrc);
-+	h_inode = d_inode(h_src);
-+	AuDebugOn(h_inode != au_h_iptr(d_inode(cpg->dentry), cpg->bsrc));
-+
-+	/* try stopping to be referenced while we are creating */
-+	h_dst = au_h_dptr(cpg->dentry, cpg->bdst);
-+	if (au_ftest_cpup(cpg->flags, RENAME))
-+		AuDebugOn(strncmp(h_dst->d_name.name, AUFS_WH_PFX,
-+				  AUFS_WH_PFX_LEN));
-+	h_parent = h_dst->d_parent; /* dir inode is locked */
-+	h_dir = d_inode(h_parent);
-+	IMustLock(h_dir);
-+	AuDebugOn(h_parent != h_dst->d_parent);
-+
-+	sb = cpg->dentry->d_sb;
-+	h_path.mnt = au_sbr_mnt(sb, cpg->bdst);
-+	if (do_dt) {
-+		h_path.dentry = h_parent;
-+		au_dtime_store(&dt, dst_parent, &h_path);
-+	}
-+	h_path.dentry = h_dst;
-+
-+	isreg = 0;
-+	isdir = 0;
-+	mode = h_inode->i_mode;
-+	switch (mode & S_IFMT) {
-+	case S_IFREG:
-+		isreg = 1;
-+		err = vfsub_create(h_dir, &h_path, mode | S_IWUSR,
-+				   /*want_excl*/true);
-+		if (!err)
-+			err = au_do_cpup_regular(cpg, h_src_attr);
-+		break;
-+	case S_IFDIR:
-+		isdir = 1;
-+		err = vfsub_mkdir(h_dir, &h_path, mode);
-+		if (!err) {
-+			/*
-+			 * strange behaviour from the users view,
-+			 * particularry setattr case
-+			 */
-+			dir = d_inode(dst_parent);
-+			if (au_ibstart(dir) == cpg->bdst)
-+				au_cpup_attr_nlink(dir, /*force*/1);
-+			inode = d_inode(cpg->dentry);
-+			au_cpup_attr_nlink(inode, /*force*/1);
-+		}
-+		break;
-+	case S_IFLNK:
-+		err = au_do_cpup_symlink(&h_path, h_src, h_dir);
-+		break;
-+	case S_IFCHR:
-+	case S_IFBLK:
-+		AuDebugOn(!capable(CAP_MKNOD));
-+		/*FALLTHROUGH*/
-+	case S_IFIFO:
-+	case S_IFSOCK:
-+		err = vfsub_mknod(h_dir, &h_path, mode, h_inode->i_rdev);
-+		break;
-+	default:
-+		AuIOErr("Unknown inode type 0%o\n", mode);
-+		err = -EIO;
-+	}
-+
-+	mnt_flags = au_mntflags(sb);
-+	if (!au_opt_test(mnt_flags, UDBA_NONE)
-+	    && !isdir
-+	    && au_opt_test(mnt_flags, XINO)
-+	    && (h_inode->i_nlink == 1
-+		|| (h_inode->i_state & I_LINKABLE))
-+	    /* todo: unnecessary? */
-+	    /* && d_inode(cpg->dentry)->i_nlink == 1 */
-+	    && cpg->bdst < cpg->bsrc
-+	    && !au_ftest_cpup(cpg->flags, KEEPLINO))
-+		au_xino_write(sb, cpg->bsrc, h_inode->i_ino, /*ino*/0);
-+		/* ignore this error */
-+
-+	if (!err) {
-+		force = 0;
-+		if (isreg) {
-+			force = !!cpg->len;
-+			if (cpg->len == -1)
-+				force = !!i_size_read(h_inode);
-+		}
-+		au_fhsm_wrote(sb, cpg->bdst, force);
-+	}
-+
-+	if (do_dt)
-+		au_dtime_revert(&dt);
-+	return err;
-+}
-+
-+static int au_do_ren_after_cpup(struct au_cp_generic *cpg, struct path *h_path)
-+{
-+	int err;
-+	struct dentry *dentry, *h_dentry, *h_parent, *parent;
-+	struct inode *h_dir;
-+	aufs_bindex_t bdst;
-+
-+	dentry = cpg->dentry;
-+	bdst = cpg->bdst;
-+	h_dentry = au_h_dptr(dentry, bdst);
-+	if (!au_ftest_cpup(cpg->flags, OVERWRITE)) {
-+		dget(h_dentry);
-+		au_set_h_dptr(dentry, bdst, NULL);
-+		err = au_lkup_neg(dentry, bdst, /*wh*/0);
-+		if (!err)
-+			h_path->dentry = dget(au_h_dptr(dentry, bdst));
-+		au_set_h_dptr(dentry, bdst, h_dentry);
-+	} else {
-+		err = 0;
-+		parent = dget_parent(dentry);
-+		h_parent = au_h_dptr(parent, bdst);
-+		dput(parent);
-+		h_path->dentry = vfsub_lkup_one(&dentry->d_name, h_parent);
-+		if (IS_ERR(h_path->dentry))
-+			err = PTR_ERR(h_path->dentry);
-+	}
-+	if (unlikely(err))
-+		goto out;
-+
-+	h_parent = h_dentry->d_parent; /* dir inode is locked */
-+	h_dir = d_inode(h_parent);
-+	IMustLock(h_dir);
-+	AuDbg("%pd %pd\n", h_dentry, h_path->dentry);
-+	/* no delegation since it is just created */
-+	err = vfsub_rename(h_dir, h_dentry, h_dir, h_path, /*delegated*/NULL);
-+	dput(h_path->dentry);
-+
-+out:
-+	return err;
-+}
-+
-+/*
-+ * copyup the @dentry from @bsrc to @bdst.
-+ * the caller must set the both of lower dentries.
-+ * @len is for truncating when it is -1 copyup the entire file.
-+ * in link/rename cases, @dst_parent may be different from the real one.
-+ * basic->bsrc can be larger than basic->bdst.
-+ */
-+static int au_cpup_single(struct au_cp_generic *cpg, struct dentry *dst_parent)
-+{
-+	int err, rerr;
-+	aufs_bindex_t old_ibstart;
-+	unsigned char isdir, plink;
-+	struct dentry *h_src, *h_dst, *h_parent;
-+	struct inode *dst_inode, *h_dir, *inode, *delegated, *src_inode;
-+	struct super_block *sb;
-+	struct au_branch *br;
-+	/* to reuduce stack size */
-+	struct {
-+		struct au_dtime dt;
-+		struct path h_path;
-+		struct au_cpup_reg_attr h_src_attr;
-+	} *a;
-+
-+	err = -ENOMEM;
-+	a = kmalloc(sizeof(*a), GFP_NOFS);
-+	if (unlikely(!a))
-+		goto out;
-+	a->h_src_attr.valid = 0;
-+
-+	sb = cpg->dentry->d_sb;
-+	br = au_sbr(sb, cpg->bdst);
-+	a->h_path.mnt = au_br_mnt(br);
-+	h_dst = au_h_dptr(cpg->dentry, cpg->bdst);
-+	h_parent = h_dst->d_parent; /* dir inode is locked */
-+	h_dir = d_inode(h_parent);
-+	IMustLock(h_dir);
-+
-+	h_src = au_h_dptr(cpg->dentry, cpg->bsrc);
-+	inode = d_inode(cpg->dentry);
-+
-+	if (!dst_parent)
-+		dst_parent = dget_parent(cpg->dentry);
-+	else
-+		dget(dst_parent);
-+
-+	plink = !!au_opt_test(au_mntflags(sb), PLINK);
-+	dst_inode = au_h_iptr(inode, cpg->bdst);
-+	if (dst_inode) {
-+		if (unlikely(!plink)) {
-+			err = -EIO;
-+			AuIOErr("hi%lu(i%lu) exists on b%d "
-+				"but plink is disabled\n",
-+				dst_inode->i_ino, inode->i_ino, cpg->bdst);
-+			goto out_parent;
-+		}
-+
-+		if (dst_inode->i_nlink) {
-+			const int do_dt = au_ftest_cpup(cpg->flags, DTIME);
-+
-+			h_src = au_plink_lkup(inode, cpg->bdst);
-+			err = PTR_ERR(h_src);
-+			if (IS_ERR(h_src))
-+				goto out_parent;
-+			if (unlikely(d_is_negative(h_src))) {
-+				err = -EIO;
-+				AuIOErr("i%lu exists on a upper branch "
-+					"but not pseudo-linked\n",
-+					inode->i_ino);
-+				dput(h_src);
-+				goto out_parent;
-+			}
-+
-+			if (do_dt) {
-+				a->h_path.dentry = h_parent;
-+				au_dtime_store(&a->dt, dst_parent, &a->h_path);
-+			}
-+
-+			a->h_path.dentry = h_dst;
-+			delegated = NULL;
-+			err = vfsub_link(h_src, h_dir, &a->h_path, &delegated);
-+			if (!err && au_ftest_cpup(cpg->flags, RENAME))
-+				err = au_do_ren_after_cpup(cpg, &a->h_path);
-+			if (do_dt)
-+				au_dtime_revert(&a->dt);
-+			if (unlikely(err == -EWOULDBLOCK)) {
-+				pr_warn("cannot retry for NFSv4 delegation"
-+					" for an internal link\n");
-+				iput(delegated);
-+			}
-+			dput(h_src);
-+			goto out_parent;
-+		} else
-+			/* todo: cpup_wh_file? */
-+			/* udba work */
-+			au_update_ibrange(inode, /*do_put_zero*/1);
-+	}
-+
-+	isdir = S_ISDIR(inode->i_mode);
-+	old_ibstart = au_ibstart(inode);
-+	err = cpup_entry(cpg, dst_parent, &a->h_src_attr);
-+	if (unlikely(err))
-+		goto out_rev;
-+	dst_inode = d_inode(h_dst);
-+	mutex_lock_nested(&dst_inode->i_mutex, AuLsc_I_CHILD2);
-+	/* todo: necessary? */
-+	/* au_pin_hdir_unlock(cpg->pin); */
-+
-+	err = cpup_iattr(cpg->dentry, cpg->bdst, h_src, &a->h_src_attr);
-+	if (unlikely(err)) {
-+		/* todo: necessary? */
-+		/* au_pin_hdir_relock(cpg->pin); */ /* ignore an error */
-+		mutex_unlock(&dst_inode->i_mutex);
-+		goto out_rev;
-+	}
-+
-+	if (cpg->bdst < old_ibstart) {
-+		if (S_ISREG(inode->i_mode)) {
-+			err = au_dy_iaop(inode, cpg->bdst, dst_inode);
-+			if (unlikely(err)) {
-+				/* ignore an error */
-+				/* au_pin_hdir_relock(cpg->pin); */
-+				mutex_unlock(&dst_inode->i_mutex);
-+				goto out_rev;
-+			}
-+		}
-+		au_set_ibstart(inode, cpg->bdst);
-+	} else
-+		au_set_ibend(inode, cpg->bdst);
-+	au_set_h_iptr(inode, cpg->bdst, au_igrab(dst_inode),
-+		      au_hi_flags(inode, isdir));
-+
-+	/* todo: necessary? */
-+	/* err = au_pin_hdir_relock(cpg->pin); */
-+	mutex_unlock(&dst_inode->i_mutex);
-+	if (unlikely(err))
-+		goto out_rev;
-+
-+	src_inode = d_inode(h_src);
-+	if (!isdir
-+	    && (src_inode->i_nlink > 1
-+		|| src_inode->i_state & I_LINKABLE)
-+	    && plink)
-+		au_plink_append(inode, cpg->bdst, h_dst);
-+
-+	if (au_ftest_cpup(cpg->flags, RENAME)) {
-+		a->h_path.dentry = h_dst;
-+		err = au_do_ren_after_cpup(cpg, &a->h_path);
-+	}
-+	if (!err)
-+		goto out_parent; /* success */
-+
-+	/* revert */
-+out_rev:
-+	a->h_path.dentry = h_parent;
-+	au_dtime_store(&a->dt, dst_parent, &a->h_path);
-+	a->h_path.dentry = h_dst;
-+	rerr = 0;
-+	if (d_is_positive(h_dst)) {
-+		if (!isdir) {
-+			/* no delegation since it is just created */
-+			rerr = vfsub_unlink(h_dir, &a->h_path,
-+					    /*delegated*/NULL, /*force*/0);
-+		} else
-+			rerr = vfsub_rmdir(h_dir, &a->h_path);
-+	}
-+	au_dtime_revert(&a->dt);
-+	if (rerr) {
-+		AuIOErr("failed removing broken entry(%d, %d)\n", err, rerr);
-+		err = -EIO;
-+	}
-+out_parent:
-+	dput(dst_parent);
-+	kfree(a);
-+out:
-+	return err;
-+}
-+
-+#if 0 /* reserved */
-+struct au_cpup_single_args {
-+	int *errp;
-+	struct au_cp_generic *cpg;
-+	struct dentry *dst_parent;
-+};
-+
-+static void au_call_cpup_single(void *args)
-+{
-+	struct au_cpup_single_args *a = args;
-+
-+	au_pin_hdir_acquire_nest(a->cpg->pin);
-+	*a->errp = au_cpup_single(a->cpg, a->dst_parent);
-+	au_pin_hdir_release(a->cpg->pin);
-+}
-+#endif
-+
-+/*
-+ * prevent SIGXFSZ in copy-up.
-+ * testing CAP_MKNOD is for generic fs,
-+ * but CAP_FSETID is for xfs only, currently.
-+ */
-+static int au_cpup_sio_test(struct au_pin *pin, umode_t mode)
-+{
-+	int do_sio;
-+	struct super_block *sb;
-+	struct inode *h_dir;
-+
-+	do_sio = 0;
-+	sb = au_pinned_parent(pin)->d_sb;
-+	if (!au_wkq_test()
-+	    && (!au_sbi(sb)->si_plink_maint_pid
-+		|| au_plink_maint(sb, AuLock_NOPLM))) {
-+		switch (mode & S_IFMT) {
-+		case S_IFREG:
-+			/* no condition about RLIMIT_FSIZE and the file size */
-+			do_sio = 1;
-+			break;
-+		case S_IFCHR:
-+		case S_IFBLK:
-+			do_sio = !capable(CAP_MKNOD);
-+			break;
-+		}
-+		if (!do_sio)
-+			do_sio = ((mode & (S_ISUID | S_ISGID))
-+				  && !capable(CAP_FSETID));
-+		/* this workaround may be removed in the future */
-+		if (!do_sio) {
-+			h_dir = au_pinned_h_dir(pin);
-+			do_sio = h_dir->i_mode & S_ISVTX;
-+		}
-+	}
-+
-+	return do_sio;
-+}
-+
-+#if 0 /* reserved */
-+int au_sio_cpup_single(struct au_cp_generic *cpg, struct dentry *dst_parent)
-+{
-+	int err, wkq_err;
-+	struct dentry *h_dentry;
-+
-+	h_dentry = au_h_dptr(cpg->dentry, cpg->bsrc);
-+	if (!au_cpup_sio_test(pin, d_inode(h_dentry)->i_mode))
-+		err = au_cpup_single(cpg, dst_parent);
-+	else {
-+		struct au_cpup_single_args args = {
-+			.errp		= &err,
-+			.cpg		= cpg,
-+			.dst_parent	= dst_parent
-+		};
-+		wkq_err = au_wkq_wait(au_call_cpup_single, &args);
-+		if (unlikely(wkq_err))
-+			err = wkq_err;
-+	}
-+
-+	return err;
-+}
-+#endif
-+
-+/*
-+ * copyup the @dentry from the first active lower branch to @bdst,
-+ * using au_cpup_single().
-+ */
-+static int au_cpup_simple(struct au_cp_generic *cpg)
-+{
-+	int err;
-+	unsigned int flags_orig;
-+	struct dentry *dentry;
-+
-+	AuDebugOn(cpg->bsrc < 0);
-+
-+	dentry = cpg->dentry;
-+	DiMustWriteLock(dentry);
-+
-+	err = au_lkup_neg(dentry, cpg->bdst, /*wh*/1);
-+	if (!err) {
-+		flags_orig = cpg->flags;
-+		au_fset_cpup(cpg->flags, RENAME);
-+		err = au_cpup_single(cpg, NULL);
-+		cpg->flags = flags_orig;
-+		if (!err)
-+			return 0; /* success */
-+
-+		/* revert */
-+		au_set_h_dptr(dentry, cpg->bdst, NULL);
-+		au_set_dbstart(dentry, cpg->bsrc);
-+	}
-+
-+	return err;
-+}
-+
-+struct au_cpup_simple_args {
-+	int *errp;
-+	struct au_cp_generic *cpg;
-+};
-+
-+static void au_call_cpup_simple(void *args)
-+{
-+	struct au_cpup_simple_args *a = args;
-+
-+	au_pin_hdir_acquire_nest(a->cpg->pin);
-+	*a->errp = au_cpup_simple(a->cpg);
-+	au_pin_hdir_release(a->cpg->pin);
-+}
-+
-+static int au_do_sio_cpup_simple(struct au_cp_generic *cpg)
-+{
-+	int err, wkq_err;
-+	struct dentry *dentry, *parent;
-+	struct file *h_file;
-+	struct inode *h_dir;
-+
-+	dentry = cpg->dentry;
-+	h_file = NULL;
-+	if (au_ftest_cpup(cpg->flags, HOPEN)) {
-+		AuDebugOn(cpg->bsrc < 0);
-+		h_file = au_h_open_pre(dentry, cpg->bsrc, /*force_wr*/0);
-+		err = PTR_ERR(h_file);
-+		if (IS_ERR(h_file))
-+			goto out;
-+	}
-+
-+	parent = dget_parent(dentry);
-+	h_dir = au_h_iptr(d_inode(parent), cpg->bdst);
-+	if (!au_test_h_perm_sio(h_dir, MAY_EXEC | MAY_WRITE)
-+	    && !au_cpup_sio_test(cpg->pin, d_inode(dentry)->i_mode))
-+		err = au_cpup_simple(cpg);
-+	else {
-+		struct au_cpup_simple_args args = {
-+			.errp		= &err,
-+			.cpg		= cpg
-+		};
-+		wkq_err = au_wkq_wait(au_call_cpup_simple, &args);
-+		if (unlikely(wkq_err))
-+			err = wkq_err;
-+	}
-+
-+	dput(parent);
-+	if (h_file)
-+		au_h_open_post(dentry, cpg->bsrc, h_file);
-+
-+out:
-+	return err;
-+}
-+
-+int au_sio_cpup_simple(struct au_cp_generic *cpg)
-+{
-+	aufs_bindex_t bsrc, bend;
-+	struct dentry *dentry, *h_dentry;
-+
-+	if (cpg->bsrc < 0) {
-+		dentry = cpg->dentry;
-+		bend = au_dbend(dentry);
-+		for (bsrc = cpg->bdst + 1; bsrc <= bend; bsrc++) {
-+			h_dentry = au_h_dptr(dentry, bsrc);
-+			if (h_dentry) {
-+				AuDebugOn(d_is_negative(h_dentry));
-+				break;
-+			}
-+		}
-+		AuDebugOn(bsrc > bend);
-+		cpg->bsrc = bsrc;
-+	}
-+	AuDebugOn(cpg->bsrc <= cpg->bdst);
-+	return au_do_sio_cpup_simple(cpg);
-+}
-+
-+int au_sio_cpdown_simple(struct au_cp_generic *cpg)
-+{
-+	AuDebugOn(cpg->bdst <= cpg->bsrc);
-+	return au_do_sio_cpup_simple(cpg);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/*
-+ * copyup the deleted file for writing.
-+ */
-+static int au_do_cpup_wh(struct au_cp_generic *cpg, struct dentry *wh_dentry,
-+			 struct file *file)
-+{
-+	int err;
-+	unsigned int flags_orig;
-+	aufs_bindex_t bsrc_orig;
-+	struct dentry *h_d_dst, *h_d_start;
-+	struct au_dinfo *dinfo;
-+	struct au_hdentry *hdp;
-+
-+	dinfo = au_di(cpg->dentry);
-+	AuRwMustWriteLock(&dinfo->di_rwsem);
-+
-+	bsrc_orig = cpg->bsrc;
-+	cpg->bsrc = dinfo->di_bstart;
-+	hdp = dinfo->di_hdentry;
-+	h_d_dst = hdp[0 + cpg->bdst].hd_dentry;
-+	dinfo->di_bstart = cpg->bdst;
-+	hdp[0 + cpg->bdst].hd_dentry = wh_dentry;
-+	h_d_start = NULL;
-+	if (file) {
-+		h_d_start = hdp[0 + cpg->bsrc].hd_dentry;
-+		hdp[0 + cpg->bsrc].hd_dentry = au_hf_top(file)->f_path.dentry;
-+	}
-+	flags_orig = cpg->flags;
-+	cpg->flags = !AuCpup_DTIME;
-+	err = au_cpup_single(cpg, /*h_parent*/NULL);
-+	cpg->flags = flags_orig;
-+	if (file) {
-+		if (!err)
-+			err = au_reopen_nondir(file);
-+		hdp[0 + cpg->bsrc].hd_dentry = h_d_start;
-+	}
-+	hdp[0 + cpg->bdst].hd_dentry = h_d_dst;
-+	dinfo->di_bstart = cpg->bsrc;
-+	cpg->bsrc = bsrc_orig;
-+
-+	return err;
-+}
-+
-+static int au_cpup_wh(struct au_cp_generic *cpg, struct file *file)
-+{
-+	int err;
-+	aufs_bindex_t bdst;
-+	struct au_dtime dt;
-+	struct dentry *dentry, *parent, *h_parent, *wh_dentry;
-+	struct au_branch *br;
-+	struct path h_path;
-+
-+	dentry = cpg->dentry;
-+	bdst = cpg->bdst;
-+	br = au_sbr(dentry->d_sb, bdst);
-+	parent = dget_parent(dentry);
-+	h_parent = au_h_dptr(parent, bdst);
-+	wh_dentry = au_whtmp_lkup(h_parent, br, &dentry->d_name);
-+	err = PTR_ERR(wh_dentry);
-+	if (IS_ERR(wh_dentry))
-+		goto out;
-+
-+	h_path.dentry = h_parent;
-+	h_path.mnt = au_br_mnt(br);
-+	au_dtime_store(&dt, parent, &h_path);
-+	err = au_do_cpup_wh(cpg, wh_dentry, file);
-+	if (unlikely(err))
-+		goto out_wh;
-+
-+	dget(wh_dentry);
-+	h_path.dentry = wh_dentry;
-+	if (!d_is_dir(wh_dentry)) {
-+		/* no delegation since it is just created */
-+		err = vfsub_unlink(d_inode(h_parent), &h_path,
-+				   /*delegated*/NULL, /*force*/0);
-+	} else
-+		err = vfsub_rmdir(d_inode(h_parent), &h_path);
-+	if (unlikely(err)) {
-+		AuIOErr("failed remove copied-up tmp file %pd(%d)\n",
-+			wh_dentry, err);
-+		err = -EIO;
-+	}
-+	au_dtime_revert(&dt);
-+	au_set_hi_wh(d_inode(dentry), bdst, wh_dentry);
-+
-+out_wh:
-+	dput(wh_dentry);
-+out:
-+	dput(parent);
-+	return err;
-+}
-+
-+struct au_cpup_wh_args {
-+	int *errp;
-+	struct au_cp_generic *cpg;
-+	struct file *file;
-+};
-+
-+static void au_call_cpup_wh(void *args)
-+{
-+	struct au_cpup_wh_args *a = args;
-+
-+	au_pin_hdir_acquire_nest(a->cpg->pin);
-+	*a->errp = au_cpup_wh(a->cpg, a->file);
-+	au_pin_hdir_release(a->cpg->pin);
-+}
-+
-+int au_sio_cpup_wh(struct au_cp_generic *cpg, struct file *file)
-+{
-+	int err, wkq_err;
-+	aufs_bindex_t bdst;
-+	struct dentry *dentry, *parent, *h_orph, *h_parent;
-+	struct inode *dir, *h_dir, *h_tmpdir;
-+	struct au_wbr *wbr;
-+	struct au_pin wh_pin, *pin_orig;
-+
-+	dentry = cpg->dentry;
-+	bdst = cpg->bdst;
-+	parent = dget_parent(dentry);
-+	dir = d_inode(parent);
-+	h_orph = NULL;
-+	h_parent = NULL;
-+	h_dir = au_igrab(au_h_iptr(dir, bdst));
-+	h_tmpdir = h_dir;
-+	pin_orig = NULL;
-+	if (!h_dir->i_nlink) {
-+		wbr = au_sbr(dentry->d_sb, bdst)->br_wbr;
-+		h_orph = wbr->wbr_orph;
-+
-+		h_parent = dget(au_h_dptr(parent, bdst));
-+		au_set_h_dptr(parent, bdst, dget(h_orph));
-+		h_tmpdir = d_inode(h_orph);
-+		au_set_h_iptr(dir, bdst, au_igrab(h_tmpdir), /*flags*/0);
-+
-+		mutex_lock_nested(&h_tmpdir->i_mutex, AuLsc_I_PARENT3);
-+		/* todo: au_h_open_pre()? */
-+
-+		pin_orig = cpg->pin;
-+		au_pin_init(&wh_pin, dentry, bdst, AuLsc_DI_PARENT,
-+			    AuLsc_I_PARENT3, cpg->pin->udba, AuPin_DI_LOCKED);
-+		cpg->pin = &wh_pin;
-+	}
-+
-+	if (!au_test_h_perm_sio(h_tmpdir, MAY_EXEC | MAY_WRITE)
-+	    && !au_cpup_sio_test(cpg->pin, d_inode(dentry)->i_mode))
-+		err = au_cpup_wh(cpg, file);
-+	else {
-+		struct au_cpup_wh_args args = {
-+			.errp	= &err,
-+			.cpg	= cpg,
-+			.file	= file
-+		};
-+		wkq_err = au_wkq_wait(au_call_cpup_wh, &args);
-+		if (unlikely(wkq_err))
-+			err = wkq_err;
-+	}
-+
-+	if (h_orph) {
-+		mutex_unlock(&h_tmpdir->i_mutex);
-+		/* todo: au_h_open_post()? */
-+		au_set_h_iptr(dir, bdst, au_igrab(h_dir), /*flags*/0);
-+		au_set_h_dptr(parent, bdst, h_parent);
-+		AuDebugOn(!pin_orig);
-+		cpg->pin = pin_orig;
-+	}
-+	iput(h_dir);
-+	dput(parent);
-+
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/*
-+ * generic routine for both of copy-up and copy-down.
-+ */
-+/* cf. revalidate function in file.c */
-+int au_cp_dirs(struct dentry *dentry, aufs_bindex_t bdst,
-+	       int (*cp)(struct dentry *dentry, aufs_bindex_t bdst,
-+			 struct au_pin *pin,
-+			 struct dentry *h_parent, void *arg),
-+	       void *arg)
-+{
-+	int err;
-+	struct au_pin pin;
-+	struct dentry *d, *parent, *h_parent, *real_parent, *h_dentry;
-+
-+	err = 0;
-+	parent = dget_parent(dentry);
-+	if (IS_ROOT(parent))
-+		goto out;
-+
-+	au_pin_init(&pin, dentry, bdst, AuLsc_DI_PARENT2, AuLsc_I_PARENT2,
-+		    au_opt_udba(dentry->d_sb), AuPin_MNT_WRITE);
-+
-+	/* do not use au_dpage */
-+	real_parent = parent;
-+	while (1) {
-+		dput(parent);
-+		parent = dget_parent(dentry);
-+		h_parent = au_h_dptr(parent, bdst);
-+		if (h_parent)
-+			goto out; /* success */
-+
-+		/* find top dir which is necessary to cpup */
-+		do {
-+			d = parent;
-+			dput(parent);
-+			parent = dget_parent(d);
-+			di_read_lock_parent3(parent, !AuLock_IR);
-+			h_parent = au_h_dptr(parent, bdst);
-+			di_read_unlock(parent, !AuLock_IR);
-+		} while (!h_parent);
-+
-+		if (d != real_parent)
-+			di_write_lock_child3(d);
-+
-+		/* somebody else might create while we were sleeping */
-+		h_dentry = au_h_dptr(d, bdst);
-+		if (!h_dentry || d_is_negative(h_dentry)) {
-+			if (h_dentry)
-+				au_update_dbstart(d);
-+
-+			au_pin_set_dentry(&pin, d);
-+			err = au_do_pin(&pin);
-+			if (!err) {
-+				err = cp(d, bdst, &pin, h_parent, arg);
-+				au_unpin(&pin);
-+			}
-+		}
-+
-+		if (d != real_parent)
-+			di_write_unlock(d);
-+		if (unlikely(err))
-+			break;
-+	}
-+
-+out:
-+	dput(parent);
-+	return err;
-+}
-+
-+static int au_cpup_dir(struct dentry *dentry, aufs_bindex_t bdst,
-+		       struct au_pin *pin,
-+		       struct dentry *h_parent __maybe_unused,
-+		       void *arg __maybe_unused)
-+{
-+	struct au_cp_generic cpg = {
-+		.dentry	= dentry,
-+		.bdst	= bdst,
-+		.bsrc	= -1,
-+		.len	= 0,
-+		.pin	= pin,
-+		.flags	= AuCpup_DTIME
-+	};
-+	return au_sio_cpup_simple(&cpg);
-+}
-+
-+int au_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst)
-+{
-+	return au_cp_dirs(dentry, bdst, au_cpup_dir, NULL);
-+}
-+
-+int au_test_and_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst)
-+{
-+	int err;
-+	struct dentry *parent;
-+	struct inode *dir;
-+
-+	parent = dget_parent(dentry);
-+	dir = d_inode(parent);
-+	err = 0;
-+	if (au_h_iptr(dir, bdst))
-+		goto out;
-+
-+	di_read_unlock(parent, AuLock_IR);
-+	di_write_lock_parent(parent);
-+	/* someone else might change our inode while we were sleeping */
-+	if (!au_h_iptr(dir, bdst))
-+		err = au_cpup_dirs(dentry, bdst);
-+	di_downgrade_lock(parent, AuLock_IR);
-+
-+out:
-+	dput(parent);
-+	return err;
-+}
-diff -Nur linux-4.1.10.orig/fs/aufs/cpup.h linux-4.1.10/fs/aufs/cpup.h
---- linux-4.1.10.orig/fs/aufs/cpup.h	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/cpup.h	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,94 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * copy-up/down functions
-+ */
-+
-+#ifndef __AUFS_CPUP_H__
-+#define __AUFS_CPUP_H__
-+
-+#ifdef __KERNEL__
-+
-+#include <linux/path.h>
-+
-+struct inode;
-+struct file;
-+struct au_pin;
-+
-+void au_cpup_attr_flags(struct inode *dst, unsigned int iflags);
-+void au_cpup_attr_timesizes(struct inode *inode);
-+void au_cpup_attr_nlink(struct inode *inode, int force);
-+void au_cpup_attr_changeable(struct inode *inode);
-+void au_cpup_igen(struct inode *inode, struct inode *h_inode);
-+void au_cpup_attr_all(struct inode *inode, int force);
-+
-+/* ---------------------------------------------------------------------- */
-+
-+struct au_cp_generic {
-+	struct dentry	*dentry;
-+	aufs_bindex_t	bdst, bsrc;
-+	loff_t		len;
-+	struct au_pin	*pin;
-+	unsigned int	flags;
-+};
-+
-+/* cpup flags */
-+#define AuCpup_DTIME		1		/* do dtime_store/revert */
-+#define AuCpup_KEEPLINO		(1 << 1)	/* do not clear the lower xino,
-+						   for link(2) */
-+#define AuCpup_RENAME		(1 << 2)	/* rename after cpup */
-+#define AuCpup_HOPEN		(1 << 3)	/* call h_open_pre/post() in
-+						   cpup */
-+#define AuCpup_OVERWRITE	(1 << 4)	/* allow overwriting the
-+						   existing entry */
-+#define AuCpup_RWDST		(1 << 5)	/* force write target even if
-+						   the branch is marked as RO */
-+
-+#define au_ftest_cpup(flags, name)	((flags) & AuCpup_##name)
-+#define au_fset_cpup(flags, name) \
-+	do { (flags) |= AuCpup_##name; } while (0)
-+#define au_fclr_cpup(flags, name) \
-+	do { (flags) &= ~AuCpup_##name; } while (0)
-+
-+int au_copy_file(struct file *dst, struct file *src, loff_t len);
-+int au_sio_cpup_simple(struct au_cp_generic *cpg);
-+int au_sio_cpdown_simple(struct au_cp_generic *cpg);
-+int au_sio_cpup_wh(struct au_cp_generic *cpg, struct file *file);
-+
-+int au_cp_dirs(struct dentry *dentry, aufs_bindex_t bdst,
-+	       int (*cp)(struct dentry *dentry, aufs_bindex_t bdst,
-+			 struct au_pin *pin,
-+			 struct dentry *h_parent, void *arg),
-+	       void *arg);
-+int au_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst);
-+int au_test_and_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst);
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* keep timestamps when copyup */
-+struct au_dtime {
-+	struct dentry *dt_dentry;
-+	struct path dt_h_path;
-+	struct timespec dt_atime, dt_mtime;
-+};
-+void au_dtime_store(struct au_dtime *dt, struct dentry *dentry,
-+		    struct path *h_path);
-+void au_dtime_revert(struct au_dtime *dt);
-+
-+#endif /* __KERNEL__ */
-+#endif /* __AUFS_CPUP_H__ */
-diff -Nur linux-4.1.10.orig/fs/aufs/dbgaufs.c linux-4.1.10/fs/aufs/dbgaufs.c
---- linux-4.1.10.orig/fs/aufs/dbgaufs.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/dbgaufs.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,432 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * debugfs interface
-+ */
-+
-+#include <linux/debugfs.h>
-+#include "aufs.h"
-+
-+#ifndef CONFIG_SYSFS
-+#error DEBUG_FS depends upon SYSFS
-+#endif
-+
-+static struct dentry *dbgaufs;
-+static const mode_t dbgaufs_mode = S_IRUSR | S_IRGRP | S_IROTH;
-+
-+/* 20 is max digits length of ulong 64 */
-+struct dbgaufs_arg {
-+	int n;
-+	char a[20 * 4];
-+};
-+
-+/*
-+ * common function for all XINO files
-+ */
-+static int dbgaufs_xi_release(struct inode *inode __maybe_unused,
-+			      struct file *file)
-+{
-+	kfree(file->private_data);
-+	return 0;
-+}
-+
-+static int dbgaufs_xi_open(struct file *xf, struct file *file, int do_fcnt)
-+{
-+	int err;
-+	struct kstat st;
-+	struct dbgaufs_arg *p;
-+
-+	err = -ENOMEM;
-+	p = kmalloc(sizeof(*p), GFP_NOFS);
-+	if (unlikely(!p))
-+		goto out;
-+
-+	err = 0;
-+	p->n = 0;
-+	file->private_data = p;
-+	if (!xf)
-+		goto out;
-+
-+	err = vfs_getattr(&xf->f_path, &st);
-+	if (!err) {
-+		if (do_fcnt)
-+			p->n = snprintf
-+				(p->a, sizeof(p->a), "%ld, %llux%lu %lld\n",
-+				 (long)file_count(xf), st.blocks, st.blksize,
-+				 (long long)st.size);
-+		else
-+			p->n = snprintf(p->a, sizeof(p->a), "%llux%lu %lld\n",
-+					st.blocks, st.blksize,
-+					(long long)st.size);
-+		AuDebugOn(p->n >= sizeof(p->a));
-+	} else {
-+		p->n = snprintf(p->a, sizeof(p->a), "err %d\n", err);
-+		err = 0;
-+	}
-+
-+out:
-+	return err;
-+
-+}
-+
-+static ssize_t dbgaufs_xi_read(struct file *file, char __user *buf,
-+			       size_t count, loff_t *ppos)
-+{
-+	struct dbgaufs_arg *p;
-+
-+	p = file->private_data;
-+	return simple_read_from_buffer(buf, count, ppos, p->a, p->n);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+struct dbgaufs_plink_arg {
-+	int n;
-+	char a[];
-+};
-+
-+static int dbgaufs_plink_release(struct inode *inode __maybe_unused,
-+				 struct file *file)
-+{
-+	free_page((unsigned long)file->private_data);
-+	return 0;
-+}
-+
-+static int dbgaufs_plink_open(struct inode *inode, struct file *file)
-+{
-+	int err, i, limit;
-+	unsigned long n, sum;
-+	struct dbgaufs_plink_arg *p;
-+	struct au_sbinfo *sbinfo;
-+	struct super_block *sb;
-+	struct au_sphlhead *sphl;
-+
-+	err = -ENOMEM;
-+	p = (void *)get_zeroed_page(GFP_NOFS);
-+	if (unlikely(!p))
-+		goto out;
-+
-+	err = -EFBIG;
-+	sbinfo = inode->i_private;
-+	sb = sbinfo->si_sb;
-+	si_noflush_read_lock(sb);
-+	if (au_opt_test(au_mntflags(sb), PLINK)) {
-+		limit = PAGE_SIZE - sizeof(p->n);
-+
-+		/* the number of buckets */
-+		n = snprintf(p->a + p->n, limit, "%d\n", AuPlink_NHASH);
-+		p->n += n;
-+		limit -= n;
-+
-+		sum = 0;
-+		for (i = 0, sphl = sbinfo->si_plink;
-+		     i < AuPlink_NHASH;
-+		     i++, sphl++) {
-+			n = au_sphl_count(sphl);
-+			sum += n;
-+
-+			n = snprintf(p->a + p->n, limit, "%lu ", n);
-+			p->n += n;
-+			limit -= n;
-+			if (unlikely(limit <= 0))
-+				goto out_free;
-+		}
-+		p->a[p->n - 1] = '\n';
-+
-+		/* the sum of plinks */
-+		n = snprintf(p->a + p->n, limit, "%lu\n", sum);
-+		p->n += n;
-+		limit -= n;
-+		if (unlikely(limit <= 0))
-+			goto out_free;
-+	} else {
-+#define str "1\n0\n0\n"
-+		p->n = sizeof(str) - 1;
-+		strcpy(p->a, str);
-+#undef str
-+	}
-+	si_read_unlock(sb);
-+
-+	err = 0;
-+	file->private_data = p;
-+	goto out; /* success */
-+
-+out_free:
-+	free_page((unsigned long)p);
-+out:
-+	return err;
-+}
-+
-+static ssize_t dbgaufs_plink_read(struct file *file, char __user *buf,
-+				  size_t count, loff_t *ppos)
-+{
-+	struct dbgaufs_plink_arg *p;
-+
-+	p = file->private_data;
-+	return simple_read_from_buffer(buf, count, ppos, p->a, p->n);
-+}
-+
-+static const struct file_operations dbgaufs_plink_fop = {
-+	.owner		= THIS_MODULE,
-+	.open		= dbgaufs_plink_open,
-+	.release	= dbgaufs_plink_release,
-+	.read		= dbgaufs_plink_read
-+};
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static int dbgaufs_xib_open(struct inode *inode, struct file *file)
-+{
-+	int err;
-+	struct au_sbinfo *sbinfo;
-+	struct super_block *sb;
-+
-+	sbinfo = inode->i_private;
-+	sb = sbinfo->si_sb;
-+	si_noflush_read_lock(sb);
-+	err = dbgaufs_xi_open(sbinfo->si_xib, file, /*do_fcnt*/0);
-+	si_read_unlock(sb);
-+	return err;
-+}
-+
-+static const struct file_operations dbgaufs_xib_fop = {
-+	.owner		= THIS_MODULE,
-+	.open		= dbgaufs_xib_open,
-+	.release	= dbgaufs_xi_release,
-+	.read		= dbgaufs_xi_read
-+};
-+
-+/* ---------------------------------------------------------------------- */
-+
-+#define DbgaufsXi_PREFIX "xi"
-+
-+static int dbgaufs_xino_open(struct inode *inode, struct file *file)
-+{
-+	int err;
-+	long l;
-+	struct au_sbinfo *sbinfo;
-+	struct super_block *sb;
-+	struct file *xf;
-+	struct qstr *name;
-+
-+	err = -ENOENT;
-+	xf = NULL;
-+	name = &file->f_path.dentry->d_name;
-+	if (unlikely(name->len < sizeof(DbgaufsXi_PREFIX)
-+		     || memcmp(name->name, DbgaufsXi_PREFIX,
-+			       sizeof(DbgaufsXi_PREFIX) - 1)))
-+		goto out;
-+	err = kstrtol(name->name + sizeof(DbgaufsXi_PREFIX) - 1, 10, &l);
-+	if (unlikely(err))
-+		goto out;
-+
-+	sbinfo = inode->i_private;
-+	sb = sbinfo->si_sb;
-+	si_noflush_read_lock(sb);
-+	if (l <= au_sbend(sb)) {
-+		xf = au_sbr(sb, (aufs_bindex_t)l)->br_xino.xi_file;
-+		err = dbgaufs_xi_open(xf, file, /*do_fcnt*/1);
-+	} else
-+		err = -ENOENT;
-+	si_read_unlock(sb);
-+
-+out:
-+	return err;
-+}
-+
-+static const struct file_operations dbgaufs_xino_fop = {
-+	.owner		= THIS_MODULE,
-+	.open		= dbgaufs_xino_open,
-+	.release	= dbgaufs_xi_release,
-+	.read		= dbgaufs_xi_read
-+};
-+
-+void dbgaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex)
-+{
-+	aufs_bindex_t bend;
-+	struct au_branch *br;
-+	struct au_xino_file *xi;
-+
-+	if (!au_sbi(sb)->si_dbgaufs)
-+		return;
-+
-+	bend = au_sbend(sb);
-+	for (; bindex <= bend; bindex++) {
-+		br = au_sbr(sb, bindex);
-+		xi = &br->br_xino;
-+		debugfs_remove(xi->xi_dbgaufs);
-+		xi->xi_dbgaufs = NULL;
-+	}
-+}
-+
-+void dbgaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex)
-+{
-+	struct au_sbinfo *sbinfo;
-+	struct dentry *parent;
-+	struct au_branch *br;
-+	struct au_xino_file *xi;
-+	aufs_bindex_t bend;
-+	char name[sizeof(DbgaufsXi_PREFIX) + 5]; /* "xi" bindex NULL */
-+
-+	sbinfo = au_sbi(sb);
-+	parent = sbinfo->si_dbgaufs;
-+	if (!parent)
-+		return;
-+
-+	bend = au_sbend(sb);
-+	for (; bindex <= bend; bindex++) {
-+		snprintf(name, sizeof(name), DbgaufsXi_PREFIX "%d", bindex);
-+		br = au_sbr(sb, bindex);
-+		xi = &br->br_xino;
-+		AuDebugOn(xi->xi_dbgaufs);
-+		xi->xi_dbgaufs = debugfs_create_file(name, dbgaufs_mode, parent,
-+						     sbinfo, &dbgaufs_xino_fop);
-+		/* ignore an error */
-+		if (unlikely(!xi->xi_dbgaufs))
-+			AuWarn1("failed %s under debugfs\n", name);
-+	}
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+#ifdef CONFIG_AUFS_EXPORT
-+static int dbgaufs_xigen_open(struct inode *inode, struct file *file)
-+{
-+	int err;
-+	struct au_sbinfo *sbinfo;
-+	struct super_block *sb;
-+
-+	sbinfo = inode->i_private;
-+	sb = sbinfo->si_sb;
-+	si_noflush_read_lock(sb);
-+	err = dbgaufs_xi_open(sbinfo->si_xigen, file, /*do_fcnt*/0);
-+	si_read_unlock(sb);
-+	return err;
-+}
-+
-+static const struct file_operations dbgaufs_xigen_fop = {
-+	.owner		= THIS_MODULE,
-+	.open		= dbgaufs_xigen_open,
-+	.release	= dbgaufs_xi_release,
-+	.read		= dbgaufs_xi_read
-+};
-+
-+static int dbgaufs_xigen_init(struct au_sbinfo *sbinfo)
-+{
-+	int err;
-+
-+	/*
-+	 * This function is a dynamic '__init' function actually,
-+	 * so the tiny check for si_rwsem is unnecessary.
-+	 */
-+	/* AuRwMustWriteLock(&sbinfo->si_rwsem); */
-+
-+	err = -EIO;
-+	sbinfo->si_dbgaufs_xigen = debugfs_create_file
-+		("xigen", dbgaufs_mode, sbinfo->si_dbgaufs, sbinfo,
-+		 &dbgaufs_xigen_fop);
-+	if (sbinfo->si_dbgaufs_xigen)
-+		err = 0;
-+
-+	return err;
-+}
-+#else
-+static int dbgaufs_xigen_init(struct au_sbinfo *sbinfo)
-+{
-+	return 0;
-+}
-+#endif /* CONFIG_AUFS_EXPORT */
-+
-+/* ---------------------------------------------------------------------- */
-+
-+void dbgaufs_si_fin(struct au_sbinfo *sbinfo)
-+{
-+	/*
-+	 * This function is a dynamic '__fin' function actually,
-+	 * so the tiny check for si_rwsem is unnecessary.
-+	 */
-+	/* AuRwMustWriteLock(&sbinfo->si_rwsem); */
-+
-+	debugfs_remove_recursive(sbinfo->si_dbgaufs);
-+	sbinfo->si_dbgaufs = NULL;
-+	kobject_put(&sbinfo->si_kobj);
-+}
-+
-+int dbgaufs_si_init(struct au_sbinfo *sbinfo)
-+{
-+	int err;
-+	char name[SysaufsSiNameLen];
-+
-+	/*
-+	 * This function is a dynamic '__init' function actually,
-+	 * so the tiny check for si_rwsem is unnecessary.
-+	 */
-+	/* AuRwMustWriteLock(&sbinfo->si_rwsem); */
-+
-+	err = -ENOENT;
-+	if (!dbgaufs) {
-+		AuErr1("/debug/aufs is uninitialized\n");
-+		goto out;
-+	}
-+
-+	err = -EIO;
-+	sysaufs_name(sbinfo, name);
-+	sbinfo->si_dbgaufs = debugfs_create_dir(name, dbgaufs);
-+	if (unlikely(!sbinfo->si_dbgaufs))
-+		goto out;
-+	kobject_get(&sbinfo->si_kobj);
-+
-+	sbinfo->si_dbgaufs_xib = debugfs_create_file
-+		("xib", dbgaufs_mode, sbinfo->si_dbgaufs, sbinfo,
-+		 &dbgaufs_xib_fop);
-+	if (unlikely(!sbinfo->si_dbgaufs_xib))
-+		goto out_dir;
-+
-+	sbinfo->si_dbgaufs_plink = debugfs_create_file
-+		("plink", dbgaufs_mode, sbinfo->si_dbgaufs, sbinfo,
-+		 &dbgaufs_plink_fop);
-+	if (unlikely(!sbinfo->si_dbgaufs_plink))
-+		goto out_dir;
-+
-+	err = dbgaufs_xigen_init(sbinfo);
-+	if (!err)
-+		goto out; /* success */
-+
-+out_dir:
-+	dbgaufs_si_fin(sbinfo);
-+out:
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+void dbgaufs_fin(void)
-+{
-+	debugfs_remove(dbgaufs);
-+}
-+
-+int __init dbgaufs_init(void)
-+{
-+	int err;
-+
-+	err = -EIO;
-+	dbgaufs = debugfs_create_dir(AUFS_NAME, NULL);
-+	if (dbgaufs)
-+		err = 0;
-+	return err;
-+}
-diff -Nur linux-4.1.10.orig/fs/aufs/dbgaufs.h linux-4.1.10/fs/aufs/dbgaufs.h
---- linux-4.1.10.orig/fs/aufs/dbgaufs.h	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/dbgaufs.h	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,48 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * debugfs interface
-+ */
-+
-+#ifndef __DBGAUFS_H__
-+#define __DBGAUFS_H__
-+
-+#ifdef __KERNEL__
-+
-+struct super_block;
-+struct au_sbinfo;
-+
-+#ifdef CONFIG_DEBUG_FS
-+/* dbgaufs.c */
-+void dbgaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex);
-+void dbgaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex);
-+void dbgaufs_si_fin(struct au_sbinfo *sbinfo);
-+int dbgaufs_si_init(struct au_sbinfo *sbinfo);
-+void dbgaufs_fin(void);
-+int __init dbgaufs_init(void);
-+#else
-+AuStubVoid(dbgaufs_brs_del, struct super_block *sb, aufs_bindex_t bindex)
-+AuStubVoid(dbgaufs_brs_add, struct super_block *sb, aufs_bindex_t bindex)
-+AuStubVoid(dbgaufs_si_fin, struct au_sbinfo *sbinfo)
-+AuStubInt0(dbgaufs_si_init, struct au_sbinfo *sbinfo)
-+AuStubVoid(dbgaufs_fin, void)
-+AuStubInt0(__init dbgaufs_init, void)
-+#endif /* CONFIG_DEBUG_FS */
-+
-+#endif /* __KERNEL__ */
-+#endif /* __DBGAUFS_H__ */
-diff -Nur linux-4.1.10.orig/fs/aufs/dcsub.c linux-4.1.10/fs/aufs/dcsub.c
---- linux-4.1.10.orig/fs/aufs/dcsub.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/dcsub.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,224 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * sub-routines for dentry cache
-+ */
-+
-+#include "aufs.h"
-+
-+static void au_dpage_free(struct au_dpage *dpage)
-+{
-+	int i;
-+	struct dentry **p;
-+
-+	p = dpage->dentries;
-+	for (i = 0; i < dpage->ndentry; i++)
-+		dput(*p++);
-+	free_page((unsigned long)dpage->dentries);
-+}
-+
-+int au_dpages_init(struct au_dcsub_pages *dpages, gfp_t gfp)
-+{
-+	int err;
-+	void *p;
-+
-+	err = -ENOMEM;
-+	dpages->dpages = kmalloc(sizeof(*dpages->dpages), gfp);
-+	if (unlikely(!dpages->dpages))
-+		goto out;
-+
-+	p = (void *)__get_free_page(gfp);
-+	if (unlikely(!p))
-+		goto out_dpages;
-+
-+	dpages->dpages[0].ndentry = 0;
-+	dpages->dpages[0].dentries = p;
-+	dpages->ndpage = 1;
-+	return 0; /* success */
-+
-+out_dpages:
-+	kfree(dpages->dpages);
-+out:
-+	return err;
-+}
-+
-+void au_dpages_free(struct au_dcsub_pages *dpages)
-+{
-+	int i;
-+	struct au_dpage *p;
-+
-+	p = dpages->dpages;
-+	for (i = 0; i < dpages->ndpage; i++)
-+		au_dpage_free(p++);
-+	kfree(dpages->dpages);
-+}
-+
-+static int au_dpages_append(struct au_dcsub_pages *dpages,
-+			    struct dentry *dentry, gfp_t gfp)
-+{
-+	int err, sz;
-+	struct au_dpage *dpage;
-+	void *p;
-+
-+	dpage = dpages->dpages + dpages->ndpage - 1;
-+	sz = PAGE_SIZE / sizeof(dentry);
-+	if (unlikely(dpage->ndentry >= sz)) {
-+		AuLabel(new dpage);
-+		err = -ENOMEM;
-+		sz = dpages->ndpage * sizeof(*dpages->dpages);
-+		p = au_kzrealloc(dpages->dpages, sz,
-+				 sz + sizeof(*dpages->dpages), gfp);
-+		if (unlikely(!p))
-+			goto out;
-+
-+		dpages->dpages = p;
-+		dpage = dpages->dpages + dpages->ndpage;
-+		p = (void *)__get_free_page(gfp);
-+		if (unlikely(!p))
-+			goto out;
-+
-+		dpage->ndentry = 0;
-+		dpage->dentries = p;
-+		dpages->ndpage++;
-+	}
-+
-+	AuDebugOn(au_dcount(dentry) <= 0);
-+	dpage->dentries[dpage->ndentry++] = dget_dlock(dentry);
-+	return 0; /* success */
-+
-+out:
-+	return err;
-+}
-+
-+/* todo: BAD approach */
-+/* copied from linux/fs/dcache.c */
-+enum d_walk_ret {
-+	D_WALK_CONTINUE,
-+	D_WALK_QUIT,
-+	D_WALK_NORETRY,
-+	D_WALK_SKIP,
-+};
-+
-+extern void d_walk(struct dentry *parent, void *data,
-+		   enum d_walk_ret (*enter)(void *, struct dentry *),
-+		   void (*finish)(void *));
-+
-+struct ac_dpages_arg {
-+	int err;
-+	struct au_dcsub_pages *dpages;
-+	struct super_block *sb;
-+	au_dpages_test test;
-+	void *arg;
-+};
-+
-+static enum d_walk_ret au_call_dpages_append(void *_arg, struct dentry *dentry)
-+{
-+	enum d_walk_ret ret;
-+	struct ac_dpages_arg *arg = _arg;
-+
-+	ret = D_WALK_CONTINUE;
-+	if (dentry->d_sb == arg->sb
-+	    && !IS_ROOT(dentry)
-+	    && au_dcount(dentry) > 0
-+	    && au_di(dentry)
-+	    && (!arg->test || arg->test(dentry, arg->arg))) {
-+		arg->err = au_dpages_append(arg->dpages, dentry, GFP_ATOMIC);
-+		if (unlikely(arg->err))
-+			ret = D_WALK_QUIT;
-+	}
-+
-+	return ret;
-+}
-+
-+int au_dcsub_pages(struct au_dcsub_pages *dpages, struct dentry *root,
-+		   au_dpages_test test, void *arg)
-+{
-+	struct ac_dpages_arg args = {
-+		.err	= 0,
-+		.dpages	= dpages,
-+		.sb	= root->d_sb,
-+		.test	= test,
-+		.arg	= arg
-+	};
-+
-+	d_walk(root, &args, au_call_dpages_append, NULL);
-+
-+	return args.err;
-+}
-+
-+int au_dcsub_pages_rev(struct au_dcsub_pages *dpages, struct dentry *dentry,
-+		       int do_include, au_dpages_test test, void *arg)
-+{
-+	int err;
-+
-+	err = 0;
-+	write_seqlock(&rename_lock);
-+	spin_lock(&dentry->d_lock);
-+	if (do_include
-+	    && au_dcount(dentry) > 0
-+	    && (!test || test(dentry, arg)))
-+		err = au_dpages_append(dpages, dentry, GFP_ATOMIC);
-+	spin_unlock(&dentry->d_lock);
-+	if (unlikely(err))
-+		goto out;
-+
-+	/*
-+	 * RCU for vfsmount is unnecessary since this is a traverse in a single
-+	 * mount
-+	 */
-+	while (!IS_ROOT(dentry)) {
-+		dentry = dentry->d_parent; /* rename_lock is locked */
-+		spin_lock(&dentry->d_lock);
-+		if (au_dcount(dentry) > 0
-+		    && (!test || test(dentry, arg)))
-+			err = au_dpages_append(dpages, dentry, GFP_ATOMIC);
-+		spin_unlock(&dentry->d_lock);
-+		if (unlikely(err))
-+			break;
-+	}
-+
-+out:
-+	write_sequnlock(&rename_lock);
-+	return err;
-+}
-+
-+static inline int au_dcsub_dpages_aufs(struct dentry *dentry, void *arg)
-+{
-+	return au_di(dentry) && dentry->d_sb == arg;
-+}
-+
-+int au_dcsub_pages_rev_aufs(struct au_dcsub_pages *dpages,
-+			    struct dentry *dentry, int do_include)
-+{
-+	return au_dcsub_pages_rev(dpages, dentry, do_include,
-+				  au_dcsub_dpages_aufs, dentry->d_sb);
-+}
-+
-+int au_test_subdir(struct dentry *d1, struct dentry *d2)
-+{
-+	struct path path[2] = {
-+		{
-+			.dentry = d1
-+		},
-+		{
-+			.dentry = d2
-+		}
-+	};
-+
-+	return path_is_under(path + 0, path + 1);
-+}
-diff -Nur linux-4.1.10.orig/fs/aufs/dcsub.h linux-4.1.10/fs/aufs/dcsub.h
---- linux-4.1.10.orig/fs/aufs/dcsub.h	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/dcsub.h	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,136 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * sub-routines for dentry cache
-+ */
-+
-+#ifndef __AUFS_DCSUB_H__
-+#define __AUFS_DCSUB_H__
-+
-+#ifdef __KERNEL__
-+
-+#include <linux/dcache.h>
-+#include <linux/fs.h>
-+
-+struct au_dpage {
-+	int ndentry;
-+	struct dentry **dentries;
-+};
-+
-+struct au_dcsub_pages {
-+	int ndpage;
-+	struct au_dpage *dpages;
-+};
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* dcsub.c */
-+int au_dpages_init(struct au_dcsub_pages *dpages, gfp_t gfp);
-+void au_dpages_free(struct au_dcsub_pages *dpages);
-+typedef int (*au_dpages_test)(struct dentry *dentry, void *arg);
-+int au_dcsub_pages(struct au_dcsub_pages *dpages, struct dentry *root,
-+		   au_dpages_test test, void *arg);
-+int au_dcsub_pages_rev(struct au_dcsub_pages *dpages, struct dentry *dentry,
-+		       int do_include, au_dpages_test test, void *arg);
-+int au_dcsub_pages_rev_aufs(struct au_dcsub_pages *dpages,
-+			    struct dentry *dentry, int do_include);
-+int au_test_subdir(struct dentry *d1, struct dentry *d2);
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/*
-+ * todo: in linux-3.13, several similar (but faster) helpers are added to
-+ * include/linux/dcache.h. Try them (in the future).
-+ */
-+
-+static inline int au_d_hashed_positive(struct dentry *d)
-+{
-+	int err;
-+	struct inode *inode = d_inode(d);
-+
-+	err = 0;
-+	if (unlikely(d_unhashed(d)
-+		     || d_is_negative(d)
-+		     || !inode->i_nlink))
-+		err = -ENOENT;
-+	return err;
-+}
-+
-+static inline int au_d_linkable(struct dentry *d)
-+{
-+	int err;
-+	struct inode *inode = d_inode(d);
-+
-+	err = au_d_hashed_positive(d);
-+	if (err
-+	    && d_is_positive(d)
-+	    && (inode->i_state & I_LINKABLE))
-+		err = 0;
-+	return err;
-+}
-+
-+static inline int au_d_alive(struct dentry *d)
-+{
-+	int err;
-+	struct inode *inode;
-+
-+	err = 0;
-+	if (!IS_ROOT(d))
-+		err = au_d_hashed_positive(d);
-+	else {
-+		inode = d_inode(d);
-+		if (unlikely(d_unlinked(d)
-+			     || d_is_negative(d)
-+			     || !inode->i_nlink))
-+			err = -ENOENT;
-+	}
-+	return err;
-+}
-+
-+static inline int au_alive_dir(struct dentry *d)
-+{
-+	int err;
-+
-+	err = au_d_alive(d);
-+	if (unlikely(err || IS_DEADDIR(d_inode(d))))
-+		err = -ENOENT;
-+	return err;
-+}
-+
-+static inline int au_qstreq(struct qstr *a, struct qstr *b)
-+{
-+	return a->len == b->len
-+		&& !memcmp(a->name, b->name, a->len);
-+}
-+
-+/*
-+ * by the commit
-+ * 360f547 2015-01-25 dcache: let the dentry count go down to zero without
-+ *			taking d_lock
-+ * the type of d_lockref.count became int, but the inlined function d_count()
-+ * still returns unsigned int.
-+ * I don't know why. Maybe it is for every d_count() users?
-+ * Anyway au_dcount() lives on.
-+ */
-+static inline int au_dcount(struct dentry *d)
-+{
-+	return (int)d_count(d);
-+}
-+
-+#endif /* __KERNEL__ */
-+#endif /* __AUFS_DCSUB_H__ */
-diff -Nur linux-4.1.10.orig/fs/aufs/debug.c linux-4.1.10/fs/aufs/debug.c
---- linux-4.1.10.orig/fs/aufs/debug.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/debug.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,440 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * debug print functions
-+ */
-+
-+#include "aufs.h"
-+
-+/* Returns 0, or -errno.  arg is in kp->arg. */
-+static int param_atomic_t_set(const char *val, const struct kernel_param *kp)
-+{
-+	int err, n;
-+
-+	err = kstrtoint(val, 0, &n);
-+	if (!err) {
-+		if (n > 0)
-+			au_debug_on();
-+		else
-+			au_debug_off();
-+	}
-+	return err;
-+}
-+
-+/* Returns length written or -errno.  Buffer is 4k (ie. be short!) */
-+static int param_atomic_t_get(char *buffer, const struct kernel_param *kp)
-+{
-+	atomic_t *a;
-+
-+	a = kp->arg;
-+	return sprintf(buffer, "%d", atomic_read(a));
-+}
-+
-+static struct kernel_param_ops param_ops_atomic_t = {
-+	.set = param_atomic_t_set,
-+	.get = param_atomic_t_get
-+	/* void (*free)(void *arg) */
-+};
-+
-+atomic_t aufs_debug = ATOMIC_INIT(0);
-+MODULE_PARM_DESC(debug, "debug print");
-+module_param_named(debug, aufs_debug, atomic_t, S_IRUGO | S_IWUSR | S_IWGRP);
-+
-+DEFINE_MUTEX(au_dbg_mtx);	/* just to serialize the dbg msgs */
-+char *au_plevel = KERN_DEBUG;
-+#define dpri(fmt, ...) do {					\
-+	if ((au_plevel						\
-+	     && strcmp(au_plevel, KERN_DEBUG))			\
-+	    || au_debug_test())					\
-+		printk("%s" fmt, au_plevel, ##__VA_ARGS__);	\
-+} while (0)
-+
-+/* ---------------------------------------------------------------------- */
-+
-+void au_dpri_whlist(struct au_nhash *whlist)
-+{
-+	unsigned long ul, n;
-+	struct hlist_head *head;
-+	struct au_vdir_wh *pos;
-+
-+	n = whlist->nh_num;
-+	head = whlist->nh_head;
-+	for (ul = 0; ul < n; ul++) {
-+		hlist_for_each_entry(pos, head, wh_hash)
-+			dpri("b%d, %.*s, %d\n",
-+			     pos->wh_bindex,
-+			     pos->wh_str.len, pos->wh_str.name,
-+			     pos->wh_str.len);
-+		head++;
-+	}
-+}
-+
-+void au_dpri_vdir(struct au_vdir *vdir)
-+{
-+	unsigned long ul;
-+	union au_vdir_deblk_p p;
-+	unsigned char *o;
-+
-+	if (!vdir || IS_ERR(vdir)) {
-+		dpri("err %ld\n", PTR_ERR(vdir));
-+		return;
-+	}
-+
-+	dpri("deblk %u, nblk %lu, deblk %p, last{%lu, %p}, ver %lu\n",
-+	     vdir->vd_deblk_sz, vdir->vd_nblk, vdir->vd_deblk,
-+	     vdir->vd_last.ul, vdir->vd_last.p.deblk, vdir->vd_version);
-+	for (ul = 0; ul < vdir->vd_nblk; ul++) {
-+		p.deblk = vdir->vd_deblk[ul];
-+		o = p.deblk;
-+		dpri("[%lu]: %p\n", ul, o);
-+	}
-+}
-+
-+static int do_pri_inode(aufs_bindex_t bindex, struct inode *inode, int hn,
-+			struct dentry *wh)
-+{
-+	char *n = NULL;
-+	int l = 0;
-+
-+	if (!inode || IS_ERR(inode)) {
-+		dpri("i%d: err %ld\n", bindex, PTR_ERR(inode));
-+		return -1;
-+	}
-+
-+	/* the type of i_blocks depends upon CONFIG_LBDAF */
-+	BUILD_BUG_ON(sizeof(inode->i_blocks) != sizeof(unsigned long)
-+		     && sizeof(inode->i_blocks) != sizeof(u64));
-+	if (wh) {
-+		n = (void *)wh->d_name.name;
-+		l = wh->d_name.len;
-+	}
-+
-+	dpri("i%d: %p, i%lu, %s, cnt %d, nl %u, 0%o, sz %llu, blk %llu,"
-+	     " hn %d, ct %lld, np %lu, st 0x%lx, f 0x%x, v %llu, g %x%s%.*s\n",
-+	     bindex, inode,
-+	     inode->i_ino, inode->i_sb ? au_sbtype(inode->i_sb) : "??",
-+	     atomic_read(&inode->i_count), inode->i_nlink, inode->i_mode,
-+	     i_size_read(inode), (unsigned long long)inode->i_blocks,
-+	     hn, (long long)timespec_to_ns(&inode->i_ctime) & 0x0ffff,
-+	     inode->i_mapping ? inode->i_mapping->nrpages : 0,
-+	     inode->i_state, inode->i_flags, inode->i_version,
-+	     inode->i_generation,
-+	     l ? ", wh " : "", l, n);
-+	return 0;
-+}
-+
-+void au_dpri_inode(struct inode *inode)
-+{
-+	struct au_iinfo *iinfo;
-+	aufs_bindex_t bindex;
-+	int err, hn;
-+
-+	err = do_pri_inode(-1, inode, -1, NULL);
-+	if (err || !au_test_aufs(inode->i_sb))
-+		return;
-+
-+	iinfo = au_ii(inode);
-+	if (!iinfo)
-+		return;
-+	dpri("i-1: bstart %d, bend %d, gen %d\n",
-+	     iinfo->ii_bstart, iinfo->ii_bend, au_iigen(inode, NULL));
-+	if (iinfo->ii_bstart < 0)
-+		return;
-+	hn = 0;
-+	for (bindex = iinfo->ii_bstart; bindex <= iinfo->ii_bend; bindex++) {
-+		hn = !!au_hn(iinfo->ii_hinode + bindex);
-+		do_pri_inode(bindex, iinfo->ii_hinode[0 + bindex].hi_inode, hn,
-+			     iinfo->ii_hinode[0 + bindex].hi_whdentry);
-+	}
-+}
-+
-+void au_dpri_dalias(struct inode *inode)
-+{
-+	struct dentry *d;
-+
-+	spin_lock(&inode->i_lock);
-+	hlist_for_each_entry(d, &inode->i_dentry, d_u.d_alias)
-+		au_dpri_dentry(d);
-+	spin_unlock(&inode->i_lock);
-+}
-+
-+static int do_pri_dentry(aufs_bindex_t bindex, struct dentry *dentry)
-+{
-+	struct dentry *wh = NULL;
-+	int hn;
-+	struct au_iinfo *iinfo;
-+
-+	if (!dentry || IS_ERR(dentry)) {
-+		dpri("d%d: err %ld\n", bindex, PTR_ERR(dentry));
-+		return -1;
-+	}
-+	/* do not call dget_parent() here */
-+	/* note: access d_xxx without d_lock */
-+	dpri("d%d: %p, %pd2?, %s, cnt %d, flags 0x%x, %shashed\n",
-+	     bindex, dentry, dentry,
-+	     dentry->d_sb ? au_sbtype(dentry->d_sb) : "??",
-+	     au_dcount(dentry), dentry->d_flags,
-+	     d_unhashed(dentry) ? "un" : "");
-+	hn = -1;
-+	if (bindex >= 0
-+	    && d_is_positive(dentry)
-+	    && au_test_aufs(dentry->d_sb)) {
-+		iinfo = au_ii(d_inode(dentry));
-+		if (iinfo) {
-+			hn = !!au_hn(iinfo->ii_hinode + bindex);
-+			wh = iinfo->ii_hinode[0 + bindex].hi_whdentry;
-+		}
-+	}
-+	do_pri_inode(bindex, d_inode(dentry), hn, wh);
-+	return 0;
-+}
-+
-+void au_dpri_dentry(struct dentry *dentry)
-+{
-+	struct au_dinfo *dinfo;
-+	aufs_bindex_t bindex;
-+	int err;
-+	struct au_hdentry *hdp;
-+
-+	err = do_pri_dentry(-1, dentry);
-+	if (err || !au_test_aufs(dentry->d_sb))
-+		return;
-+
-+	dinfo = au_di(dentry);
-+	if (!dinfo)
-+		return;
-+	dpri("d-1: bstart %d, bend %d, bwh %d, bdiropq %d, gen %d, tmp %d\n",
-+	     dinfo->di_bstart, dinfo->di_bend,
-+	     dinfo->di_bwh, dinfo->di_bdiropq, au_digen(dentry),
-+	     dinfo->di_tmpfile);
-+	if (dinfo->di_bstart < 0)
-+		return;
-+	hdp = dinfo->di_hdentry;
-+	for (bindex = dinfo->di_bstart; bindex <= dinfo->di_bend; bindex++)
-+		do_pri_dentry(bindex, hdp[0 + bindex].hd_dentry);
-+}
-+
-+static int do_pri_file(aufs_bindex_t bindex, struct file *file)
-+{
-+	char a[32];
-+
-+	if (!file || IS_ERR(file)) {
-+		dpri("f%d: err %ld\n", bindex, PTR_ERR(file));
-+		return -1;
-+	}
-+	a[0] = 0;
-+	if (bindex < 0
-+	    && !IS_ERR_OR_NULL(file->f_path.dentry)
-+	    && au_test_aufs(file->f_path.dentry->d_sb)
-+	    && au_fi(file))
-+		snprintf(a, sizeof(a), ", gen %d, mmapped %d",
-+			 au_figen(file), atomic_read(&au_fi(file)->fi_mmapped));
-+	dpri("f%d: mode 0x%x, flags 0%o, cnt %ld, v %llu, pos %llu%s\n",
-+	     bindex, file->f_mode, file->f_flags, (long)file_count(file),
-+	     file->f_version, file->f_pos, a);
-+	if (!IS_ERR_OR_NULL(file->f_path.dentry))
-+		do_pri_dentry(bindex, file->f_path.dentry);
-+	return 0;
-+}
-+
-+void au_dpri_file(struct file *file)
-+{
-+	struct au_finfo *finfo;
-+	struct au_fidir *fidir;
-+	struct au_hfile *hfile;
-+	aufs_bindex_t bindex;
-+	int err;
-+
-+	err = do_pri_file(-1, file);
-+	if (err
-+	    || IS_ERR_OR_NULL(file->f_path.dentry)
-+	    || !au_test_aufs(file->f_path.dentry->d_sb))
-+		return;
-+
-+	finfo = au_fi(file);
-+	if (!finfo)
-+		return;
-+	if (finfo->fi_btop < 0)
-+		return;
-+	fidir = finfo->fi_hdir;
-+	if (!fidir)
-+		do_pri_file(finfo->fi_btop, finfo->fi_htop.hf_file);
-+	else
-+		for (bindex = finfo->fi_btop;
-+		     bindex >= 0 && bindex <= fidir->fd_bbot;
-+		     bindex++) {
-+			hfile = fidir->fd_hfile + bindex;
-+			do_pri_file(bindex, hfile ? hfile->hf_file : NULL);
-+		}
-+}
-+
-+static int do_pri_br(aufs_bindex_t bindex, struct au_branch *br)
-+{
-+	struct vfsmount *mnt;
-+	struct super_block *sb;
-+
-+	if (!br || IS_ERR(br))
-+		goto out;
-+	mnt = au_br_mnt(br);
-+	if (!mnt || IS_ERR(mnt))
-+		goto out;
-+	sb = mnt->mnt_sb;
-+	if (!sb || IS_ERR(sb))
-+		goto out;
-+
-+	dpri("s%d: {perm 0x%x, id %d, cnt %d, wbr %p}, "
-+	     "%s, dev 0x%02x%02x, flags 0x%lx, cnt %d, active %d, "
-+	     "xino %d\n",
-+	     bindex, br->br_perm, br->br_id, atomic_read(&br->br_count),
-+	     br->br_wbr, au_sbtype(sb), MAJOR(sb->s_dev), MINOR(sb->s_dev),
-+	     sb->s_flags, sb->s_count,
-+	     atomic_read(&sb->s_active), !!br->br_xino.xi_file);
-+	return 0;
-+
-+out:
-+	dpri("s%d: err %ld\n", bindex, PTR_ERR(br));
-+	return -1;
-+}
-+
-+void au_dpri_sb(struct super_block *sb)
-+{
-+	struct au_sbinfo *sbinfo;
-+	aufs_bindex_t bindex;
-+	int err;
-+	/* to reuduce stack size */
-+	struct {
-+		struct vfsmount mnt;
-+		struct au_branch fake;
-+	} *a;
-+
-+	/* this function can be called from magic sysrq */
-+	a = kzalloc(sizeof(*a), GFP_ATOMIC);
-+	if (unlikely(!a)) {
-+		dpri("no memory\n");
-+		return;
-+	}
-+
-+	a->mnt.mnt_sb = sb;
-+	a->fake.br_perm = 0;
-+	a->fake.br_path.mnt = &a->mnt;
-+	a->fake.br_xino.xi_file = NULL;
-+	atomic_set(&a->fake.br_count, 0);
-+	smp_mb(); /* atomic_set */
-+	err = do_pri_br(-1, &a->fake);
-+	kfree(a);
-+	dpri("dev 0x%x\n", sb->s_dev);
-+	if (err || !au_test_aufs(sb))
-+		return;
-+
-+	sbinfo = au_sbi(sb);
-+	if (!sbinfo)
-+		return;
-+	dpri("nw %d, gen %u, kobj %d\n",
-+	     atomic_read(&sbinfo->si_nowait.nw_len), sbinfo->si_generation,
-+	     atomic_read(&sbinfo->si_kobj.kref.refcount));
-+	for (bindex = 0; bindex <= sbinfo->si_bend; bindex++)
-+		do_pri_br(bindex, sbinfo->si_branch[0 + bindex]);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+void __au_dbg_verify_dinode(struct dentry *dentry, const char *func, int line)
-+{
-+	struct inode *h_inode, *inode = d_inode(dentry);
-+	struct dentry *h_dentry;
-+	aufs_bindex_t bindex, bend, bi;
-+
-+	if (!inode /* || au_di(dentry)->di_lsc == AuLsc_DI_TMP */)
-+		return;
-+
-+	bend = au_dbend(dentry);
-+	bi = au_ibend(inode);
-+	if (bi < bend)
-+		bend = bi;
-+	bindex = au_dbstart(dentry);
-+	bi = au_ibstart(inode);
-+	if (bi > bindex)
-+		bindex = bi;
-+
-+	for (; bindex <= bend; bindex++) {
-+		h_dentry = au_h_dptr(dentry, bindex);
-+		if (!h_dentry)
-+			continue;
-+		h_inode = au_h_iptr(inode, bindex);
-+		if (unlikely(h_inode != d_inode(h_dentry))) {
-+			au_debug_on();
-+			AuDbg("b%d, %s:%d\n", bindex, func, line);
-+			AuDbgDentry(dentry);
-+			AuDbgInode(inode);
-+			au_debug_off();
-+			BUG();
-+		}
-+	}
-+}
-+
-+void au_dbg_verify_gen(struct dentry *parent, unsigned int sigen)
-+{
-+	int err, i, j;
-+	struct au_dcsub_pages dpages;
-+	struct au_dpage *dpage;
-+	struct dentry **dentries;
-+
-+	err = au_dpages_init(&dpages, GFP_NOFS);
-+	AuDebugOn(err);
-+	err = au_dcsub_pages_rev_aufs(&dpages, parent, /*do_include*/1);
-+	AuDebugOn(err);
-+	for (i = dpages.ndpage - 1; !err && i >= 0; i--) {
-+		dpage = dpages.dpages + i;
-+		dentries = dpage->dentries;
-+		for (j = dpage->ndentry - 1; !err && j >= 0; j--)
-+			AuDebugOn(au_digen_test(dentries[j], sigen));
-+	}
-+	au_dpages_free(&dpages);
-+}
-+
-+void au_dbg_verify_kthread(void)
-+{
-+	if (au_wkq_test()) {
-+		au_dbg_blocked();
-+		/*
-+		 * It may be recursive, but udba=notify between two aufs mounts,
-+		 * where a single ro branch is shared, is not a problem.
-+		 */
-+		/* WARN_ON(1); */
-+	}
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+int __init au_debug_init(void)
-+{
-+	aufs_bindex_t bindex;
-+	struct au_vdir_destr destr;
-+
-+	bindex = -1;
-+	AuDebugOn(bindex >= 0);
-+
-+	destr.len = -1;
-+	AuDebugOn(destr.len < NAME_MAX);
-+
-+#ifdef CONFIG_4KSTACKS
-+	pr_warn("CONFIG_4KSTACKS is defined.\n");
-+#endif
-+
-+	return 0;
-+}
-diff -Nur linux-4.1.10.orig/fs/aufs/debug.h linux-4.1.10/fs/aufs/debug.h
---- linux-4.1.10.orig/fs/aufs/debug.h	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/debug.h	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,225 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * debug print functions
-+ */
-+
-+#ifndef __AUFS_DEBUG_H__
-+#define __AUFS_DEBUG_H__
-+
-+#ifdef __KERNEL__
-+
-+#include <linux/atomic.h>
-+#include <linux/module.h>
-+#include <linux/kallsyms.h>
-+#include <linux/sysrq.h>
-+
-+#ifdef CONFIG_AUFS_DEBUG
-+#define AuDebugOn(a)		BUG_ON(a)
-+
-+/* module parameter */
-+extern atomic_t aufs_debug;
-+static inline void au_debug_on(void)
-+{
-+	atomic_inc(&aufs_debug);
-+}
-+static inline void au_debug_off(void)
-+{
-+	atomic_dec_if_positive(&aufs_debug);
-+}
-+
-+static inline int au_debug_test(void)
-+{
-+	return atomic_read(&aufs_debug) > 0;
-+}
-+#else
-+#define AuDebugOn(a)		do {} while (0)
-+AuStubVoid(au_debug_on, void)
-+AuStubVoid(au_debug_off, void)
-+AuStubInt0(au_debug_test, void)
-+#endif /* CONFIG_AUFS_DEBUG */
-+
-+#define param_check_atomic_t(name, p) __param_check(name, p, atomic_t)
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* debug print */
-+
-+#define AuDbg(fmt, ...) do { \
-+	if (au_debug_test()) \
-+		pr_debug("DEBUG: " fmt, ##__VA_ARGS__); \
-+} while (0)
-+#define AuLabel(l)		AuDbg(#l "\n")
-+#define AuIOErr(fmt, ...)	pr_err("I/O Error, " fmt, ##__VA_ARGS__)
-+#define AuWarn1(fmt, ...) do { \
-+	static unsigned char _c; \
-+	if (!_c++) \
-+		pr_warn(fmt, ##__VA_ARGS__); \
-+} while (0)
-+
-+#define AuErr1(fmt, ...) do { \
-+	static unsigned char _c; \
-+	if (!_c++) \
-+		pr_err(fmt, ##__VA_ARGS__); \
-+} while (0)
-+
-+#define AuIOErr1(fmt, ...) do { \
-+	static unsigned char _c; \
-+	if (!_c++) \
-+		AuIOErr(fmt, ##__VA_ARGS__); \
-+} while (0)
-+
-+#define AuUnsupportMsg	"This operation is not supported." \
-+			" Please report this application to aufs-users ML."
-+#define AuUnsupport(fmt, ...) do { \
-+	pr_err(AuUnsupportMsg "\n" fmt, ##__VA_ARGS__); \
-+	dump_stack(); \
-+} while (0)
-+
-+#define AuTraceErr(e) do { \
-+	if (unlikely((e) < 0)) \
-+		AuDbg("err %d\n", (int)(e)); \
-+} while (0)
-+
-+#define AuTraceErrPtr(p) do { \
-+	if (IS_ERR(p)) \
-+		AuDbg("err %ld\n", PTR_ERR(p)); \
-+} while (0)
-+
-+/* dirty macros for debug print, use with "%.*s" and caution */
-+#define AuLNPair(qstr)		(qstr)->len, (qstr)->name
-+
-+/* ---------------------------------------------------------------------- */
-+
-+struct dentry;
-+#ifdef CONFIG_AUFS_DEBUG
-+extern struct mutex au_dbg_mtx;
-+extern char *au_plevel;
-+struct au_nhash;
-+void au_dpri_whlist(struct au_nhash *whlist);
-+struct au_vdir;
-+void au_dpri_vdir(struct au_vdir *vdir);
-+struct inode;
-+void au_dpri_inode(struct inode *inode);
-+void au_dpri_dalias(struct inode *inode);
-+void au_dpri_dentry(struct dentry *dentry);
-+struct file;
-+void au_dpri_file(struct file *filp);
-+struct super_block;
-+void au_dpri_sb(struct super_block *sb);
-+
-+#define au_dbg_verify_dinode(d) __au_dbg_verify_dinode(d, __func__, __LINE__)
-+void __au_dbg_verify_dinode(struct dentry *dentry, const char *func, int line);
-+void au_dbg_verify_gen(struct dentry *parent, unsigned int sigen);
-+void au_dbg_verify_kthread(void);
-+
-+int __init au_debug_init(void);
-+
-+#define AuDbgWhlist(w) do { \
-+	mutex_lock(&au_dbg_mtx); \
-+	AuDbg(#w "\n"); \
-+	au_dpri_whlist(w); \
-+	mutex_unlock(&au_dbg_mtx); \
-+} while (0)
-+
-+#define AuDbgVdir(v) do { \
-+	mutex_lock(&au_dbg_mtx); \
-+	AuDbg(#v "\n"); \
-+	au_dpri_vdir(v); \
-+	mutex_unlock(&au_dbg_mtx); \
-+} while (0)
-+
-+#define AuDbgInode(i) do { \
-+	mutex_lock(&au_dbg_mtx); \
-+	AuDbg(#i "\n"); \
-+	au_dpri_inode(i); \
-+	mutex_unlock(&au_dbg_mtx); \
-+} while (0)
-+
-+#define AuDbgDAlias(i) do { \
-+	mutex_lock(&au_dbg_mtx); \
-+	AuDbg(#i "\n"); \
-+	au_dpri_dalias(i); \
-+	mutex_unlock(&au_dbg_mtx); \
-+} while (0)
-+
-+#define AuDbgDentry(d) do { \
-+	mutex_lock(&au_dbg_mtx); \
-+	AuDbg(#d "\n"); \
-+	au_dpri_dentry(d); \
-+	mutex_unlock(&au_dbg_mtx); \
-+} while (0)
-+
-+#define AuDbgFile(f) do { \
-+	mutex_lock(&au_dbg_mtx); \
-+	AuDbg(#f "\n"); \
-+	au_dpri_file(f); \
-+	mutex_unlock(&au_dbg_mtx); \
-+} while (0)
-+
-+#define AuDbgSb(sb) do { \
-+	mutex_lock(&au_dbg_mtx); \
-+	AuDbg(#sb "\n"); \
-+	au_dpri_sb(sb); \
-+	mutex_unlock(&au_dbg_mtx); \
-+} while (0)
-+
-+#define AuDbgSym(addr) do {				\
-+	char sym[KSYM_SYMBOL_LEN];			\
-+	sprint_symbol(sym, (unsigned long)addr);	\
-+	AuDbg("%s\n", sym);				\
-+} while (0)
-+#else
-+AuStubVoid(au_dbg_verify_dinode, struct dentry *dentry)
-+AuStubVoid(au_dbg_verify_gen, struct dentry *parent, unsigned int sigen)
-+AuStubVoid(au_dbg_verify_kthread, void)
-+AuStubInt0(__init au_debug_init, void)
-+
-+#define AuDbgWhlist(w)		do {} while (0)
-+#define AuDbgVdir(v)		do {} while (0)
-+#define AuDbgInode(i)		do {} while (0)
-+#define AuDbgDAlias(i)		do {} while (0)
-+#define AuDbgDentry(d)		do {} while (0)
-+#define AuDbgFile(f)		do {} while (0)
-+#define AuDbgSb(sb)		do {} while (0)
-+#define AuDbgSym(addr)		do {} while (0)
-+#endif /* CONFIG_AUFS_DEBUG */
-+
-+/* ---------------------------------------------------------------------- */
-+
-+#ifdef CONFIG_AUFS_MAGIC_SYSRQ
-+int __init au_sysrq_init(void);
-+void au_sysrq_fin(void);
-+
-+#ifdef CONFIG_HW_CONSOLE
-+#define au_dbg_blocked() do { \
-+	WARN_ON(1); \
-+	handle_sysrq('w'); \
-+} while (0)
-+#else
-+AuStubVoid(au_dbg_blocked, void)
-+#endif
-+
-+#else
-+AuStubInt0(__init au_sysrq_init, void)
-+AuStubVoid(au_sysrq_fin, void)
-+AuStubVoid(au_dbg_blocked, void)
-+#endif /* CONFIG_AUFS_MAGIC_SYSRQ */
-+
-+#endif /* __KERNEL__ */
-+#endif /* __AUFS_DEBUG_H__ */
-diff -Nur linux-4.1.10.orig/fs/aufs/dentry.c linux-4.1.10/fs/aufs/dentry.c
---- linux-4.1.10.orig/fs/aufs/dentry.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/dentry.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,1105 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * lookup and dentry operations
-+ */
-+
-+#include <linux/namei.h>
-+#include "aufs.h"
-+
-+#define AuLkup_ALLOW_NEG	1
-+#define AuLkup_IGNORE_PERM	(1 << 1)
-+#define au_ftest_lkup(flags, name)	((flags) & AuLkup_##name)
-+#define au_fset_lkup(flags, name) \
-+	do { (flags) |= AuLkup_##name; } while (0)
-+#define au_fclr_lkup(flags, name) \
-+	do { (flags) &= ~AuLkup_##name; } while (0)
-+
-+struct au_do_lookup_args {
-+	unsigned int		flags;
-+	mode_t			type;
-+};
-+
-+/*
-+ * returns positive/negative dentry, NULL or an error.
-+ * NULL means whiteout-ed or not-found.
-+ */
-+static struct dentry*
-+au_do_lookup(struct dentry *h_parent, struct dentry *dentry,
-+	     aufs_bindex_t bindex, struct qstr *wh_name,
-+	     struct au_do_lookup_args *args)
-+{
-+	struct dentry *h_dentry;
-+	struct inode *h_inode;
-+	struct au_branch *br;
-+	int wh_found, opq;
-+	unsigned char wh_able;
-+	const unsigned char allow_neg = !!au_ftest_lkup(args->flags, ALLOW_NEG);
-+	const unsigned char ignore_perm = !!au_ftest_lkup(args->flags,
-+							  IGNORE_PERM);
-+
-+	wh_found = 0;
-+	br = au_sbr(dentry->d_sb, bindex);
-+	wh_able = !!au_br_whable(br->br_perm);
-+	if (wh_able)
-+		wh_found = au_wh_test(h_parent, wh_name, /*try_sio*/0);
-+	h_dentry = ERR_PTR(wh_found);
-+	if (!wh_found)
-+		goto real_lookup;
-+	if (unlikely(wh_found < 0))
-+		goto out;
-+
-+	/* We found a whiteout */
-+	/* au_set_dbend(dentry, bindex); */
-+	au_set_dbwh(dentry, bindex);
-+	if (!allow_neg)
-+		return NULL; /* success */
-+
-+real_lookup:
-+	if (!ignore_perm)
-+		h_dentry = vfsub_lkup_one(&dentry->d_name, h_parent);
-+	else
-+		h_dentry = au_sio_lkup_one(&dentry->d_name, h_parent);
-+	if (IS_ERR(h_dentry)) {
-+		if (PTR_ERR(h_dentry) == -ENAMETOOLONG
-+		    && !allow_neg)
-+			h_dentry = NULL;
-+		goto out;
-+	}
-+
-+	h_inode = d_inode(h_dentry);
-+	if (d_is_negative(h_dentry)) {
-+		if (!allow_neg)
-+			goto out_neg;
-+	} else if (wh_found
-+		   || (args->type && args->type != (h_inode->i_mode & S_IFMT)))
-+		goto out_neg;
-+
-+	if (au_dbend(dentry) <= bindex)
-+		au_set_dbend(dentry, bindex);
-+	if (au_dbstart(dentry) < 0 || bindex < au_dbstart(dentry))
-+		au_set_dbstart(dentry, bindex);
-+	au_set_h_dptr(dentry, bindex, h_dentry);
-+
-+	if (!d_is_dir(h_dentry)
-+	    || !wh_able
-+	    || (d_really_is_positive(dentry) && !d_is_dir(dentry)))
-+		goto out; /* success */
-+
-+	mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
-+	opq = au_diropq_test(h_dentry);
-+	mutex_unlock(&h_inode->i_mutex);
-+	if (opq > 0)
-+		au_set_dbdiropq(dentry, bindex);
-+	else if (unlikely(opq < 0)) {
-+		au_set_h_dptr(dentry, bindex, NULL);
-+		h_dentry = ERR_PTR(opq);
-+	}
-+	goto out;
-+
-+out_neg:
-+	dput(h_dentry);
-+	h_dentry = NULL;
-+out:
-+	return h_dentry;
-+}
-+
-+static int au_test_shwh(struct super_block *sb, const struct qstr *name)
-+{
-+	if (unlikely(!au_opt_test(au_mntflags(sb), SHWH)
-+		     && !strncmp(name->name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)))
-+		return -EPERM;
-+	return 0;
-+}
-+
-+/*
-+ * returns the number of lower positive dentries,
-+ * otherwise an error.
-+ * can be called at unlinking with @type is zero.
-+ */
-+int au_lkup_dentry(struct dentry *dentry, aufs_bindex_t bstart, mode_t type)
-+{
-+	int npositive, err;
-+	aufs_bindex_t bindex, btail, bdiropq;
-+	unsigned char isdir, dirperm1;
-+	struct qstr whname;
-+	struct au_do_lookup_args args = {
-+		.flags		= 0,
-+		.type		= type
-+	};
-+	const struct qstr *name = &dentry->d_name;
-+	struct dentry *parent;
-+	struct super_block *sb;
-+
-+	sb = dentry->d_sb;
-+	err = au_test_shwh(sb, name);
-+	if (unlikely(err))
-+		goto out;
-+
-+	err = au_wh_name_alloc(&whname, name);
-+	if (unlikely(err))
-+		goto out;
-+
-+	isdir = !!d_is_dir(dentry);
-+	if (!type)
-+		au_fset_lkup(args.flags, ALLOW_NEG);
-+	dirperm1 = !!au_opt_test(au_mntflags(sb), DIRPERM1);
-+
-+	npositive = 0;
-+	parent = dget_parent(dentry);
-+	btail = au_dbtaildir(parent);
-+	for (bindex = bstart; bindex <= btail; bindex++) {
-+		struct dentry *h_parent, *h_dentry;
-+		struct inode *h_inode, *h_dir;
-+
-+		h_dentry = au_h_dptr(dentry, bindex);
-+		if (h_dentry) {
-+			if (d_is_positive(h_dentry))
-+				npositive++;
-+			if (type != S_IFDIR)
-+				break;
-+			continue;
-+		}
-+		h_parent = au_h_dptr(parent, bindex);
-+		if (!h_parent || !d_is_dir(h_parent))
-+			continue;
-+
-+		h_dir = d_inode(h_parent);
-+		mutex_lock_nested(&h_dir->i_mutex, AuLsc_I_PARENT);
-+		h_dentry = au_do_lookup(h_parent, dentry, bindex, &whname,
-+					&args);
-+		mutex_unlock(&h_dir->i_mutex);
-+		err = PTR_ERR(h_dentry);
-+		if (IS_ERR(h_dentry))
-+			goto out_parent;
-+		if (h_dentry)
-+			au_fclr_lkup(args.flags, ALLOW_NEG);
-+		if (dirperm1)
-+			au_fset_lkup(args.flags, IGNORE_PERM);
-+
-+		if (au_dbwh(dentry) == bindex)
-+			break;
-+		if (!h_dentry)
-+			continue;
-+		if (d_is_negative(h_dentry))
-+			continue;
-+		h_inode = d_inode(h_dentry);
-+		npositive++;
-+		if (!args.type)
-+			args.type = h_inode->i_mode & S_IFMT;
-+		if (args.type != S_IFDIR)
-+			break;
-+		else if (isdir) {
-+			/* the type of lower may be different */
-+			bdiropq = au_dbdiropq(dentry);
-+			if (bdiropq >= 0 && bdiropq <= bindex)
-+				break;
-+		}
-+	}
-+
-+	if (npositive) {
-+		AuLabel(positive);
-+		au_update_dbstart(dentry);
-+	}
-+	err = npositive;
-+	if (unlikely(!au_opt_test(au_mntflags(sb), UDBA_NONE)
-+		     && au_dbstart(dentry) < 0)) {
-+		err = -EIO;
-+		AuIOErr("both of real entry and whiteout found, %pd, err %d\n",
-+			dentry, err);
-+	}
-+
-+out_parent:
-+	dput(parent);
-+	kfree(whname.name);
-+out:
-+	return err;
-+}
-+
-+struct dentry *au_sio_lkup_one(struct qstr *name, struct dentry *parent)
-+{
-+	struct dentry *dentry;
-+	int wkq_err;
-+
-+	if (!au_test_h_perm_sio(d_inode(parent), MAY_EXEC))
-+		dentry = vfsub_lkup_one(name, parent);
-+	else {
-+		struct vfsub_lkup_one_args args = {
-+			.errp	= &dentry,
-+			.name	= name,
-+			.parent	= parent
-+		};
-+
-+		wkq_err = au_wkq_wait(vfsub_call_lkup_one, &args);
-+		if (unlikely(wkq_err))
-+			dentry = ERR_PTR(wkq_err);
-+	}
-+
-+	return dentry;
-+}
-+
-+/*
-+ * lookup @dentry on @bindex which should be negative.
-+ */
-+int au_lkup_neg(struct dentry *dentry, aufs_bindex_t bindex, int wh)
-+{
-+	int err;
-+	struct dentry *parent, *h_parent, *h_dentry;
-+	struct au_branch *br;
-+
-+	parent = dget_parent(dentry);
-+	h_parent = au_h_dptr(parent, bindex);
-+	br = au_sbr(dentry->d_sb, bindex);
-+	if (wh)
-+		h_dentry = au_whtmp_lkup(h_parent, br, &dentry->d_name);
-+	else
-+		h_dentry = au_sio_lkup_one(&dentry->d_name, h_parent);
-+	err = PTR_ERR(h_dentry);
-+	if (IS_ERR(h_dentry))
-+		goto out;
-+	if (unlikely(d_is_positive(h_dentry))) {
-+		err = -EIO;
-+		AuIOErr("%pd should be negative on b%d.\n", h_dentry, bindex);
-+		dput(h_dentry);
-+		goto out;
-+	}
-+
-+	err = 0;
-+	if (bindex < au_dbstart(dentry))
-+		au_set_dbstart(dentry, bindex);
-+	if (au_dbend(dentry) < bindex)
-+		au_set_dbend(dentry, bindex);
-+	au_set_h_dptr(dentry, bindex, h_dentry);
-+
-+out:
-+	dput(parent);
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* subset of struct inode */
-+struct au_iattr {
-+	unsigned long		i_ino;
-+	/* unsigned int		i_nlink; */
-+	kuid_t			i_uid;
-+	kgid_t			i_gid;
-+	u64			i_version;
-+/*
-+	loff_t			i_size;
-+	blkcnt_t		i_blocks;
-+*/
-+	umode_t			i_mode;
-+};
-+
-+static void au_iattr_save(struct au_iattr *ia, struct inode *h_inode)
-+{
-+	ia->i_ino = h_inode->i_ino;
-+	/* ia->i_nlink = h_inode->i_nlink; */
-+	ia->i_uid = h_inode->i_uid;
-+	ia->i_gid = h_inode->i_gid;
-+	ia->i_version = h_inode->i_version;
-+/*
-+	ia->i_size = h_inode->i_size;
-+	ia->i_blocks = h_inode->i_blocks;
-+*/
-+	ia->i_mode = (h_inode->i_mode & S_IFMT);
-+}
-+
-+static int au_iattr_test(struct au_iattr *ia, struct inode *h_inode)
-+{
-+	return ia->i_ino != h_inode->i_ino
-+		/* || ia->i_nlink != h_inode->i_nlink */
-+		|| !uid_eq(ia->i_uid, h_inode->i_uid)
-+		|| !gid_eq(ia->i_gid, h_inode->i_gid)
-+		|| ia->i_version != h_inode->i_version
-+/*
-+		|| ia->i_size != h_inode->i_size
-+		|| ia->i_blocks != h_inode->i_blocks
-+*/
-+		|| ia->i_mode != (h_inode->i_mode & S_IFMT);
-+}
-+
-+static int au_h_verify_dentry(struct dentry *h_dentry, struct dentry *h_parent,
-+			      struct au_branch *br)
-+{
-+	int err;
-+	struct au_iattr ia;
-+	struct inode *h_inode;
-+	struct dentry *h_d;
-+	struct super_block *h_sb;
-+
-+	err = 0;
-+	memset(&ia, -1, sizeof(ia));
-+	h_sb = h_dentry->d_sb;
-+	h_inode = NULL;
-+	if (d_is_positive(h_dentry)) {
-+		h_inode = d_inode(h_dentry);
-+		au_iattr_save(&ia, h_inode);
-+	} else if (au_test_nfs(h_sb) || au_test_fuse(h_sb))
-+		/* nfs d_revalidate may return 0 for negative dentry */
-+		/* fuse d_revalidate always return 0 for negative dentry */
-+		goto out;
-+
-+	/* main purpose is namei.c:cached_lookup() and d_revalidate */
-+	h_d = vfsub_lkup_one(&h_dentry->d_name, h_parent);
-+	err = PTR_ERR(h_d);
-+	if (IS_ERR(h_d))
-+		goto out;
-+
-+	err = 0;
-+	if (unlikely(h_d != h_dentry
-+		     || d_inode(h_d) != h_inode
-+		     || (h_inode && au_iattr_test(&ia, h_inode))))
-+		err = au_busy_or_stale();
-+	dput(h_d);
-+
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+int au_h_verify(struct dentry *h_dentry, unsigned int udba, struct inode *h_dir,
-+		struct dentry *h_parent, struct au_branch *br)
-+{
-+	int err;
-+
-+	err = 0;
-+	if (udba == AuOpt_UDBA_REVAL
-+	    && !au_test_fs_remote(h_dentry->d_sb)) {
-+		IMustLock(h_dir);
-+		err = (d_inode(h_dentry->d_parent) != h_dir);
-+	} else if (udba != AuOpt_UDBA_NONE)
-+		err = au_h_verify_dentry(h_dentry, h_parent, br);
-+
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static int au_do_refresh_hdentry(struct dentry *dentry, struct dentry *parent)
-+{
-+	int err;
-+	aufs_bindex_t new_bindex, bindex, bend, bwh, bdiropq;
-+	struct au_hdentry tmp, *p, *q;
-+	struct au_dinfo *dinfo;
-+	struct super_block *sb;
-+
-+	DiMustWriteLock(dentry);
-+
-+	sb = dentry->d_sb;
-+	dinfo = au_di(dentry);
-+	bend = dinfo->di_bend;
-+	bwh = dinfo->di_bwh;
-+	bdiropq = dinfo->di_bdiropq;
-+	p = dinfo->di_hdentry + dinfo->di_bstart;
-+	for (bindex = dinfo->di_bstart; bindex <= bend; bindex++, p++) {
-+		if (!p->hd_dentry)
-+			continue;
-+
-+		new_bindex = au_br_index(sb, p->hd_id);
-+		if (new_bindex == bindex)
-+			continue;
-+
-+		if (dinfo->di_bwh == bindex)
-+			bwh = new_bindex;
-+		if (dinfo->di_bdiropq == bindex)
-+			bdiropq = new_bindex;
-+		if (new_bindex < 0) {
-+			au_hdput(p);
-+			p->hd_dentry = NULL;
-+			continue;
-+		}
-+
-+		/* swap two lower dentries, and loop again */
-+		q = dinfo->di_hdentry + new_bindex;
-+		tmp = *q;
-+		*q = *p;
-+		*p = tmp;
-+		if (tmp.hd_dentry) {
-+			bindex--;
-+			p--;
-+		}
-+	}
-+
-+	dinfo->di_bwh = -1;
-+	if (bwh >= 0 && bwh <= au_sbend(sb) && au_sbr_whable(sb, bwh))
-+		dinfo->di_bwh = bwh;
-+
-+	dinfo->di_bdiropq = -1;
-+	if (bdiropq >= 0
-+	    && bdiropq <= au_sbend(sb)
-+	    && au_sbr_whable(sb, bdiropq))
-+		dinfo->di_bdiropq = bdiropq;
-+
-+	err = -EIO;
-+	dinfo->di_bstart = -1;
-+	dinfo->di_bend = -1;
-+	bend = au_dbend(parent);
-+	p = dinfo->di_hdentry;
-+	for (bindex = 0; bindex <= bend; bindex++, p++)
-+		if (p->hd_dentry) {
-+			dinfo->di_bstart = bindex;
-+			break;
-+		}
-+
-+	if (dinfo->di_bstart >= 0) {
-+		p = dinfo->di_hdentry + bend;
-+		for (bindex = bend; bindex >= 0; bindex--, p--)
-+			if (p->hd_dentry) {
-+				dinfo->di_bend = bindex;
-+				err = 0;
-+				break;
-+			}
-+	}
-+
-+	return err;
-+}
-+
-+static void au_do_hide(struct dentry *dentry)
-+{
-+	struct inode *inode;
-+
-+	if (d_really_is_positive(dentry)) {
-+		inode = d_inode(dentry);
-+		if (!d_is_dir(dentry)) {
-+			if (inode->i_nlink && !d_unhashed(dentry))
-+				drop_nlink(inode);
-+		} else {
-+			clear_nlink(inode);
-+			/* stop next lookup */
-+			inode->i_flags |= S_DEAD;
-+		}
-+		smp_mb(); /* necessary? */
-+	}
-+	d_drop(dentry);
-+}
-+
-+static int au_hide_children(struct dentry *parent)
-+{
-+	int err, i, j, ndentry;
-+	struct au_dcsub_pages dpages;
-+	struct au_dpage *dpage;
-+	struct dentry *dentry;
-+
-+	err = au_dpages_init(&dpages, GFP_NOFS);
-+	if (unlikely(err))
-+		goto out;
-+	err = au_dcsub_pages(&dpages, parent, NULL, NULL);
-+	if (unlikely(err))
-+		goto out_dpages;
-+
-+	/* in reverse order */
-+	for (i = dpages.ndpage - 1; i >= 0; i--) {
-+		dpage = dpages.dpages + i;
-+		ndentry = dpage->ndentry;
-+		for (j = ndentry - 1; j >= 0; j--) {
-+			dentry = dpage->dentries[j];
-+			if (dentry != parent)
-+				au_do_hide(dentry);
-+		}
-+	}
-+
-+out_dpages:
-+	au_dpages_free(&dpages);
-+out:
-+	return err;
-+}
-+
-+static void au_hide(struct dentry *dentry)
-+{
-+	int err;
-+
-+	AuDbgDentry(dentry);
-+	if (d_is_dir(dentry)) {
-+		/* shrink_dcache_parent(dentry); */
-+		err = au_hide_children(dentry);
-+		if (unlikely(err))
-+			AuIOErr("%pd, failed hiding children, ignored %d\n",
-+				dentry, err);
-+	}
-+	au_do_hide(dentry);
-+}
-+
-+/*
-+ * By adding a dirty branch, a cached dentry may be affected in various ways.
-+ *
-+ * a dirty branch is added
-+ * - on the top of layers
-+ * - in the middle of layers
-+ * - to the bottom of layers
-+ *
-+ * on the added branch there exists
-+ * - a whiteout
-+ * - a diropq
-+ * - a same named entry
-+ *   + exist
-+ *     * negative --> positive
-+ *     * positive --> positive
-+ *	 - type is unchanged
-+ *	 - type is changed
-+ *   + doesn't exist
-+ *     * negative --> negative
-+ *     * positive --> negative (rejected by au_br_del() for non-dir case)
-+ * - none
-+ */
-+static int au_refresh_by_dinfo(struct dentry *dentry, struct au_dinfo *dinfo,
-+			       struct au_dinfo *tmp)
-+{
-+	int err;
-+	aufs_bindex_t bindex, bend;
-+	struct {
-+		struct dentry *dentry;
-+		struct inode *inode;
-+		mode_t mode;
-+	} orig_h, tmp_h;
-+	struct au_hdentry *hd;
-+	struct inode *inode, *h_inode;
-+	struct dentry *h_dentry;
-+
-+	err = 0;
-+	AuDebugOn(dinfo->di_bstart < 0);
-+	orig_h.mode = 0;
-+	orig_h.dentry = dinfo->di_hdentry[dinfo->di_bstart].hd_dentry;
-+	orig_h.inode = NULL;
-+	if (d_is_positive(orig_h.dentry)) {
-+		orig_h.inode = d_inode(orig_h.dentry);
-+		orig_h.mode = orig_h.inode->i_mode & S_IFMT;
-+	}
-+	memset(&tmp_h, 0, sizeof(tmp_h));
-+	if (tmp->di_bstart >= 0) {
-+		tmp_h.dentry = tmp->di_hdentry[tmp->di_bstart].hd_dentry;
-+		tmp_h.inode = NULL;
-+		if (d_is_positive(tmp_h.dentry)) {
-+			tmp_h.inode = d_inode(tmp_h.dentry);
-+			tmp_h.mode = tmp_h.inode->i_mode & S_IFMT;
-+		}
-+	}
-+
-+	inode = NULL;
-+	if (d_really_is_positive(dentry))
-+		inode = d_inode(dentry);
-+	if (!orig_h.inode) {
-+		AuDbg("nagative originally\n");
-+		if (inode) {
-+			au_hide(dentry);
-+			goto out;
-+		}
-+		AuDebugOn(inode);
-+		AuDebugOn(dinfo->di_bstart != dinfo->di_bend);
-+		AuDebugOn(dinfo->di_bdiropq != -1);
-+
-+		if (!tmp_h.inode) {
-+			AuDbg("negative --> negative\n");
-+			/* should have only one negative lower */
-+			if (tmp->di_bstart >= 0
-+			    && tmp->di_bstart < dinfo->di_bstart) {
-+				AuDebugOn(tmp->di_bstart != tmp->di_bend);
-+				AuDebugOn(dinfo->di_bstart != dinfo->di_bend);
-+				au_set_h_dptr(dentry, dinfo->di_bstart, NULL);
-+				au_di_cp(dinfo, tmp);
-+				hd = tmp->di_hdentry + tmp->di_bstart;
-+				au_set_h_dptr(dentry, tmp->di_bstart,
-+					      dget(hd->hd_dentry));
-+			}
-+			au_dbg_verify_dinode(dentry);
-+		} else {
-+			AuDbg("negative --> positive\n");
-+			/*
-+			 * similar to the behaviour of creating with bypassing
-+			 * aufs.
-+			 * unhash it in order to force an error in the
-+			 * succeeding create operation.
-+			 * we should not set S_DEAD here.
-+			 */
-+			d_drop(dentry);
-+			/* au_di_swap(tmp, dinfo); */
-+			au_dbg_verify_dinode(dentry);
-+		}
-+	} else {
-+		AuDbg("positive originally\n");
-+		/* inode may be NULL */
-+		AuDebugOn(inode && (inode->i_mode & S_IFMT) != orig_h.mode);
-+		if (!tmp_h.inode) {
-+			AuDbg("positive --> negative\n");
-+			/* or bypassing aufs */
-+			au_hide(dentry);
-+			if (tmp->di_bwh >= 0 && tmp->di_bwh <= dinfo->di_bstart)
-+				dinfo->di_bwh = tmp->di_bwh;
-+			if (inode)
-+				err = au_refresh_hinode_self(inode);
-+			au_dbg_verify_dinode(dentry);
-+		} else if (orig_h.mode == tmp_h.mode) {
-+			AuDbg("positive --> positive, same type\n");
-+			if (!S_ISDIR(orig_h.mode)
-+			    && dinfo->di_bstart > tmp->di_bstart) {
-+				/*
-+				 * similar to the behaviour of removing and
-+				 * creating.
-+				 */
-+				au_hide(dentry);
-+				if (inode)
-+					err = au_refresh_hinode_self(inode);
-+				au_dbg_verify_dinode(dentry);
-+			} else {
-+				/* fill empty slots */
-+				if (dinfo->di_bstart > tmp->di_bstart)
-+					dinfo->di_bstart = tmp->di_bstart;
-+				if (dinfo->di_bend < tmp->di_bend)
-+					dinfo->di_bend = tmp->di_bend;
-+				dinfo->di_bwh = tmp->di_bwh;
-+				dinfo->di_bdiropq = tmp->di_bdiropq;
-+				hd = tmp->di_hdentry;
-+				bend = dinfo->di_bend;
-+				for (bindex = tmp->di_bstart; bindex <= bend;
-+				     bindex++) {
-+					if (au_h_dptr(dentry, bindex))
-+						continue;
-+					h_dentry = hd[bindex].hd_dentry;
-+					if (!h_dentry)
-+						continue;
-+					AuDebugOn(d_is_negative(h_dentry));
-+					h_inode = d_inode(h_dentry);
-+					AuDebugOn(orig_h.mode
-+						  != (h_inode->i_mode
-+						      & S_IFMT));
-+					au_set_h_dptr(dentry, bindex,
-+						      dget(h_dentry));
-+				}
-+				err = au_refresh_hinode(inode, dentry);
-+				au_dbg_verify_dinode(dentry);
-+			}
-+		} else {
-+			AuDbg("positive --> positive, different type\n");
-+			/* similar to the behaviour of removing and creating */
-+			au_hide(dentry);
-+			if (inode)
-+				err = au_refresh_hinode_self(inode);
-+			au_dbg_verify_dinode(dentry);
-+		}
-+	}
-+
-+out:
-+	return err;
-+}
-+
-+int au_refresh_dentry(struct dentry *dentry, struct dentry *parent)
-+{
-+	int err, ebrange;
-+	unsigned int sigen;
-+	struct au_dinfo *dinfo, *tmp;
-+	struct super_block *sb;
-+	struct inode *inode;
-+
-+	DiMustWriteLock(dentry);
-+	AuDebugOn(IS_ROOT(dentry));
-+	AuDebugOn(d_really_is_negative(parent));
-+
-+	sb = dentry->d_sb;
-+	sigen = au_sigen(sb);
-+	err = au_digen_test(parent, sigen);
-+	if (unlikely(err))
-+		goto out;
-+
-+	dinfo = au_di(dentry);
-+	err = au_di_realloc(dinfo, au_sbend(sb) + 1);
-+	if (unlikely(err))
-+		goto out;
-+	ebrange = au_dbrange_test(dentry);
-+	if (!ebrange)
-+		ebrange = au_do_refresh_hdentry(dentry, parent);
-+
-+	if (d_unhashed(dentry) || ebrange /* || dinfo->di_tmpfile */) {
-+		AuDebugOn(au_dbstart(dentry) < 0 && au_dbend(dentry) >= 0);
-+		if (d_really_is_positive(dentry)) {
-+			inode = d_inode(dentry);
-+			err = au_refresh_hinode_self(inode);
-+		}
-+		au_dbg_verify_dinode(dentry);
-+		if (!err)
-+			goto out_dgen; /* success */
-+		goto out;
-+	}
-+
-+	/* temporary dinfo */
-+	AuDbgDentry(dentry);
-+	err = -ENOMEM;
-+	tmp = au_di_alloc(sb, AuLsc_DI_TMP);
-+	if (unlikely(!tmp))
-+		goto out;
-+	au_di_swap(tmp, dinfo);
-+	/* returns the number of positive dentries */
-+	/*
-+	 * if current working dir is removed, it returns an error.
-+	 * but the dentry is legal.
-+	 */
-+	err = au_lkup_dentry(dentry, /*bstart*/0, /*type*/0);
-+	AuDbgDentry(dentry);
-+	au_di_swap(tmp, dinfo);
-+	if (err == -ENOENT)
-+		err = 0;
-+	if (err >= 0) {
-+		/* compare/refresh by dinfo */
-+		AuDbgDentry(dentry);
-+		err = au_refresh_by_dinfo(dentry, dinfo, tmp);
-+		au_dbg_verify_dinode(dentry);
-+		AuTraceErr(err);
-+	}
-+	au_rw_write_unlock(&tmp->di_rwsem);
-+	au_di_free(tmp);
-+	if (unlikely(err))
-+		goto out;
-+
-+out_dgen:
-+	au_update_digen(dentry);
-+out:
-+	if (unlikely(err && !(dentry->d_flags & DCACHE_NFSFS_RENAMED))) {
-+		AuIOErr("failed refreshing %pd, %d\n", dentry, err);
-+		AuDbgDentry(dentry);
-+	}
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+static int au_do_h_d_reval(struct dentry *h_dentry, unsigned int flags,
-+			   struct dentry *dentry, aufs_bindex_t bindex)
-+{
-+	int err, valid;
-+
-+	err = 0;
-+	if (!(h_dentry->d_flags & DCACHE_OP_REVALIDATE))
-+		goto out;
-+
-+	AuDbg("b%d\n", bindex);
-+	/*
-+	 * gave up supporting LOOKUP_CREATE/OPEN for lower fs,
-+	 * due to whiteout and branch permission.
-+	 */
-+	flags &= ~(/*LOOKUP_PARENT |*/ LOOKUP_OPEN | LOOKUP_CREATE
-+		   | LOOKUP_FOLLOW | LOOKUP_EXCL);
-+	/* it may return tri-state */
-+	valid = h_dentry->d_op->d_revalidate(h_dentry, flags);
-+
-+	if (unlikely(valid < 0))
-+		err = valid;
-+	else if (!valid)
-+		err = -EINVAL;
-+
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+/* todo: remove this */
-+static int h_d_revalidate(struct dentry *dentry, struct inode *inode,
-+			  unsigned int flags, int do_udba)
-+{
-+	int err;
-+	umode_t mode, h_mode;
-+	aufs_bindex_t bindex, btail, bstart, ibs, ibe;
-+	unsigned char plus, unhashed, is_root, h_plus, h_nfs, tmpfile;
-+	struct inode *h_inode, *h_cached_inode;
-+	struct dentry *h_dentry;
-+	struct qstr *name, *h_name;
-+
-+	err = 0;
-+	plus = 0;
-+	mode = 0;
-+	ibs = -1;
-+	ibe = -1;
-+	unhashed = !!d_unhashed(dentry);
-+	is_root = !!IS_ROOT(dentry);
-+	name = &dentry->d_name;
-+	tmpfile = au_di(dentry)->di_tmpfile;
-+
-+	/*
-+	 * Theoretically, REVAL test should be unnecessary in case of
-+	 * {FS,I}NOTIFY.
-+	 * But {fs,i}notify doesn't fire some necessary events,
-+	 *	IN_ATTRIB for atime/nlink/pageio
-+	 * Let's do REVAL test too.
-+	 */
-+	if (do_udba && inode) {
-+		mode = (inode->i_mode & S_IFMT);
-+		plus = (inode->i_nlink > 0);
-+		ibs = au_ibstart(inode);
-+		ibe = au_ibend(inode);
-+	}
-+
-+	bstart = au_dbstart(dentry);
-+	btail = bstart;
-+	if (inode && S_ISDIR(inode->i_mode))
-+		btail = au_dbtaildir(dentry);
-+	for (bindex = bstart; bindex <= btail; bindex++) {
-+		h_dentry = au_h_dptr(dentry, bindex);
-+		if (!h_dentry)
-+			continue;
-+
-+		AuDbg("b%d, %pd\n", bindex, h_dentry);
-+		h_nfs = !!au_test_nfs(h_dentry->d_sb);
-+		spin_lock(&h_dentry->d_lock);
-+		h_name = &h_dentry->d_name;
-+		if (unlikely(do_udba
-+			     && !is_root
-+			     && ((!h_nfs
-+				  && (unhashed != !!d_unhashed(h_dentry)
-+				      || (!tmpfile
-+					  && !au_qstreq(name, h_name))
-+					  ))
-+				 || (h_nfs
-+				     && !(flags & LOOKUP_OPEN)
-+				     && (h_dentry->d_flags
-+					 & DCACHE_NFSFS_RENAMED)))
-+			    )) {
-+			int h_unhashed;
-+
-+			h_unhashed = d_unhashed(h_dentry);
-+			spin_unlock(&h_dentry->d_lock);
-+			AuDbg("unhash 0x%x 0x%x, %pd %pd\n",
-+			      unhashed, h_unhashed, dentry, h_dentry);
-+			goto err;
-+		}
-+		spin_unlock(&h_dentry->d_lock);
-+
-+		err = au_do_h_d_reval(h_dentry, flags, dentry, bindex);
-+		if (unlikely(err))
-+			/* do not goto err, to keep the errno */
-+			break;
-+
-+		/* todo: plink too? */
-+		if (!do_udba)
-+			continue;
-+
-+		/* UDBA tests */
-+		if (unlikely(!!inode != d_is_positive(h_dentry)))
-+			goto err;
-+
-+		h_inode = NULL;
-+		if (d_is_positive(h_dentry))
-+			h_inode = d_inode(h_dentry);
-+		h_plus = plus;
-+		h_mode = mode;
-+		h_cached_inode = h_inode;
-+		if (h_inode) {
-+			h_mode = (h_inode->i_mode & S_IFMT);
-+			h_plus = (h_inode->i_nlink > 0);
-+		}
-+		if (inode && ibs <= bindex && bindex <= ibe)
-+			h_cached_inode = au_h_iptr(inode, bindex);
-+
-+		if (!h_nfs) {
-+			if (unlikely(plus != h_plus && !tmpfile))
-+				goto err;
-+		} else {
-+			if (unlikely(!(h_dentry->d_flags & DCACHE_NFSFS_RENAMED)
-+				     && !is_root
-+				     && !IS_ROOT(h_dentry)
-+				     && unhashed != d_unhashed(h_dentry)))
-+				goto err;
-+		}
-+		if (unlikely(mode != h_mode
-+			     || h_cached_inode != h_inode))
-+			goto err;
-+		continue;
-+
-+err:
-+		err = -EINVAL;
-+		break;
-+	}
-+
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+/* todo: consolidate with do_refresh() and au_reval_for_attr() */
-+static int simple_reval_dpath(struct dentry *dentry, unsigned int sigen)
-+{
-+	int err;
-+	struct dentry *parent;
-+
-+	if (!au_digen_test(dentry, sigen))
-+		return 0;
-+
-+	parent = dget_parent(dentry);
-+	di_read_lock_parent(parent, AuLock_IR);
-+	AuDebugOn(au_digen_test(parent, sigen));
-+	au_dbg_verify_gen(parent, sigen);
-+	err = au_refresh_dentry(dentry, parent);
-+	di_read_unlock(parent, AuLock_IR);
-+	dput(parent);
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+int au_reval_dpath(struct dentry *dentry, unsigned int sigen)
-+{
-+	int err;
-+	struct dentry *d, *parent;
-+
-+	if (!au_ftest_si(au_sbi(dentry->d_sb), FAILED_REFRESH_DIR))
-+		return simple_reval_dpath(dentry, sigen);
-+
-+	/* slow loop, keep it simple and stupid */
-+	/* cf: au_cpup_dirs() */
-+	err = 0;
-+	parent = NULL;
-+	while (au_digen_test(dentry, sigen)) {
-+		d = dentry;
-+		while (1) {
-+			dput(parent);
-+			parent = dget_parent(d);
-+			if (!au_digen_test(parent, sigen))
-+				break;
-+			d = parent;
-+		}
-+
-+		if (d != dentry)
-+			di_write_lock_child2(d);
-+
-+		/* someone might update our dentry while we were sleeping */
-+		if (au_digen_test(d, sigen)) {
-+			/*
-+			 * todo: consolidate with simple_reval_dpath(),
-+			 * do_refresh() and au_reval_for_attr().
-+			 */
-+			di_read_lock_parent(parent, AuLock_IR);
-+			err = au_refresh_dentry(d, parent);
-+			di_read_unlock(parent, AuLock_IR);
-+		}
-+
-+		if (d != dentry)
-+			di_write_unlock(d);
-+		dput(parent);
-+		if (unlikely(err))
-+			break;
-+	}
-+
-+	return err;
-+}
-+
-+/*
-+ * if valid returns 1, otherwise 0.
-+ */
-+static int aufs_d_revalidate(struct dentry *dentry, unsigned int flags)
-+{
-+	int valid, err;
-+	unsigned int sigen;
-+	unsigned char do_udba;
-+	struct super_block *sb;
-+	struct inode *inode;
-+
-+	/* todo: support rcu-walk? */
-+	if (flags & LOOKUP_RCU)
-+		return -ECHILD;
-+
-+	valid = 0;
-+	if (unlikely(!au_di(dentry)))
-+		goto out;
-+
-+	valid = 1;
-+	sb = dentry->d_sb;
-+	/*
-+	 * todo: very ugly
-+	 * i_mutex of parent dir may be held,
-+	 * but we should not return 'invalid' due to busy.
-+	 */
-+	err = aufs_read_lock(dentry, AuLock_FLUSH | AuLock_DW | AuLock_NOPLM);
-+	if (unlikely(err)) {
-+		valid = err;
-+		AuTraceErr(err);
-+		goto out;
-+	}
-+	inode = NULL;
-+	if (d_really_is_positive(dentry))
-+		inode = d_inode(dentry);
-+	if (unlikely(inode && is_bad_inode(inode))) {
-+		err = -EINVAL;
-+		AuTraceErr(err);
-+		goto out_dgrade;
-+	}
-+	if (unlikely(au_dbrange_test(dentry))) {
-+		err = -EINVAL;
-+		AuTraceErr(err);
-+		goto out_dgrade;
-+	}
-+
-+	sigen = au_sigen(sb);
-+	if (au_digen_test(dentry, sigen)) {
-+		AuDebugOn(IS_ROOT(dentry));
-+		err = au_reval_dpath(dentry, sigen);
-+		if (unlikely(err)) {
-+			AuTraceErr(err);
-+			goto out_dgrade;
-+		}
-+	}
-+	di_downgrade_lock(dentry, AuLock_IR);
-+
-+	err = -EINVAL;
-+	if (!(flags & (LOOKUP_OPEN | LOOKUP_EMPTY))
-+	    && inode
-+	    && !(inode->i_state && I_LINKABLE)
-+	    && (IS_DEADDIR(inode) || !inode->i_nlink))
-+		goto out_inval;
-+
-+	do_udba = !au_opt_test(au_mntflags(sb), UDBA_NONE);
-+	if (do_udba && inode) {
-+		aufs_bindex_t bstart = au_ibstart(inode);
-+		struct inode *h_inode;
-+
-+		if (bstart >= 0) {
-+			h_inode = au_h_iptr(inode, bstart);
-+			if (h_inode && au_test_higen(inode, h_inode))
-+				goto out_inval;
-+		}
-+	}
-+
-+	err = h_d_revalidate(dentry, inode, flags, do_udba);
-+	if (unlikely(!err && do_udba && au_dbstart(dentry) < 0)) {
-+		err = -EIO;
-+		AuDbg("both of real entry and whiteout found, %p, err %d\n",
-+		      dentry, err);
-+	}
-+	goto out_inval;
-+
-+out_dgrade:
-+	di_downgrade_lock(dentry, AuLock_IR);
-+out_inval:
-+	aufs_read_unlock(dentry, AuLock_IR);
-+	AuTraceErr(err);
-+	valid = !err;
-+out:
-+	if (!valid) {
-+		AuDbg("%pd invalid, %d\n", dentry, valid);
-+		d_drop(dentry);
-+	}
-+	return valid;
-+}
-+
-+static void aufs_d_release(struct dentry *dentry)
-+{
-+	if (au_di(dentry)) {
-+		au_di_fin(dentry);
-+		au_hn_di_reinit(dentry);
-+	}
-+}
-+
-+const struct dentry_operations aufs_dop = {
-+	.d_revalidate		= aufs_d_revalidate,
-+	.d_weak_revalidate	= aufs_d_revalidate,
-+	.d_release		= aufs_d_release
-+};
-diff -Nur linux-4.1.10.orig/fs/aufs/dentry.h linux-4.1.10/fs/aufs/dentry.h
---- linux-4.1.10.orig/fs/aufs/dentry.h	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/dentry.h	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,233 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * lookup and dentry operations
-+ */
-+
-+#ifndef __AUFS_DENTRY_H__
-+#define __AUFS_DENTRY_H__
-+
-+#ifdef __KERNEL__
-+
-+#include <linux/dcache.h>
-+#include "rwsem.h"
-+
-+struct au_hdentry {
-+	struct dentry		*hd_dentry;
-+	aufs_bindex_t		hd_id;
-+};
-+
-+struct au_dinfo {
-+	atomic_t		di_generation;
-+
-+	struct au_rwsem		di_rwsem;
-+	aufs_bindex_t		di_bstart, di_bend, di_bwh, di_bdiropq;
-+	unsigned char		di_tmpfile; /* to allow the different name */
-+	struct au_hdentry	*di_hdentry;
-+} ____cacheline_aligned_in_smp;
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* dentry.c */
-+extern const struct dentry_operations aufs_dop;
-+struct au_branch;
-+struct dentry *au_sio_lkup_one(struct qstr *name, struct dentry *parent);
-+int au_h_verify(struct dentry *h_dentry, unsigned int udba, struct inode *h_dir,
-+		struct dentry *h_parent, struct au_branch *br);
-+
-+int au_lkup_dentry(struct dentry *dentry, aufs_bindex_t bstart, mode_t type);
-+int au_lkup_neg(struct dentry *dentry, aufs_bindex_t bindex, int wh);
-+int au_refresh_dentry(struct dentry *dentry, struct dentry *parent);
-+int au_reval_dpath(struct dentry *dentry, unsigned int sigen);
-+
-+/* dinfo.c */
-+void au_di_init_once(void *_di);
-+struct au_dinfo *au_di_alloc(struct super_block *sb, unsigned int lsc);
-+void au_di_free(struct au_dinfo *dinfo);
-+void au_di_swap(struct au_dinfo *a, struct au_dinfo *b);
-+void au_di_cp(struct au_dinfo *dst, struct au_dinfo *src);
-+int au_di_init(struct dentry *dentry);
-+void au_di_fin(struct dentry *dentry);
-+int au_di_realloc(struct au_dinfo *dinfo, int nbr);
-+
-+void di_read_lock(struct dentry *d, int flags, unsigned int lsc);
-+void di_read_unlock(struct dentry *d, int flags);
-+void di_downgrade_lock(struct dentry *d, int flags);
-+void di_write_lock(struct dentry *d, unsigned int lsc);
-+void di_write_unlock(struct dentry *d);
-+void di_write_lock2_child(struct dentry *d1, struct dentry *d2, int isdir);
-+void di_write_lock2_parent(struct dentry *d1, struct dentry *d2, int isdir);
-+void di_write_unlock2(struct dentry *d1, struct dentry *d2);
-+
-+struct dentry *au_h_dptr(struct dentry *dentry, aufs_bindex_t bindex);
-+struct dentry *au_h_d_alias(struct dentry *dentry, aufs_bindex_t bindex);
-+aufs_bindex_t au_dbtail(struct dentry *dentry);
-+aufs_bindex_t au_dbtaildir(struct dentry *dentry);
-+
-+void au_set_h_dptr(struct dentry *dentry, aufs_bindex_t bindex,
-+		   struct dentry *h_dentry);
-+int au_digen_test(struct dentry *dentry, unsigned int sigen);
-+int au_dbrange_test(struct dentry *dentry);
-+void au_update_digen(struct dentry *dentry);
-+void au_update_dbrange(struct dentry *dentry, int do_put_zero);
-+void au_update_dbstart(struct dentry *dentry);
-+void au_update_dbend(struct dentry *dentry);
-+int au_find_dbindex(struct dentry *dentry, struct dentry *h_dentry);
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static inline struct au_dinfo *au_di(struct dentry *dentry)
-+{
-+	return dentry->d_fsdata;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* lock subclass for dinfo */
-+enum {
-+	AuLsc_DI_CHILD,		/* child first */
-+	AuLsc_DI_CHILD2,	/* rename(2), link(2), and cpup at hnotify */
-+	AuLsc_DI_CHILD3,	/* copyup dirs */
-+	AuLsc_DI_PARENT,
-+	AuLsc_DI_PARENT2,
-+	AuLsc_DI_PARENT3,
-+	AuLsc_DI_TMP		/* temp for replacing dinfo */
-+};
-+
-+/*
-+ * di_read_lock_child, di_write_lock_child,
-+ * di_read_lock_child2, di_write_lock_child2,
-+ * di_read_lock_child3, di_write_lock_child3,
-+ * di_read_lock_parent, di_write_lock_parent,
-+ * di_read_lock_parent2, di_write_lock_parent2,
-+ * di_read_lock_parent3, di_write_lock_parent3,
-+ */
-+#define AuReadLockFunc(name, lsc) \
-+static inline void di_read_lock_##name(struct dentry *d, int flags) \
-+{ di_read_lock(d, flags, AuLsc_DI_##lsc); }
-+
-+#define AuWriteLockFunc(name, lsc) \
-+static inline void di_write_lock_##name(struct dentry *d) \
-+{ di_write_lock(d, AuLsc_DI_##lsc); }
-+
-+#define AuRWLockFuncs(name, lsc) \
-+	AuReadLockFunc(name, lsc) \
-+	AuWriteLockFunc(name, lsc)
-+
-+AuRWLockFuncs(child, CHILD);
-+AuRWLockFuncs(child2, CHILD2);
-+AuRWLockFuncs(child3, CHILD3);
-+AuRWLockFuncs(parent, PARENT);
-+AuRWLockFuncs(parent2, PARENT2);
-+AuRWLockFuncs(parent3, PARENT3);
-+
-+#undef AuReadLockFunc
-+#undef AuWriteLockFunc
-+#undef AuRWLockFuncs
-+
-+#define DiMustNoWaiters(d)	AuRwMustNoWaiters(&au_di(d)->di_rwsem)
-+#define DiMustAnyLock(d)	AuRwMustAnyLock(&au_di(d)->di_rwsem)
-+#define DiMustWriteLock(d)	AuRwMustWriteLock(&au_di(d)->di_rwsem)
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* todo: memory barrier? */
-+static inline unsigned int au_digen(struct dentry *d)
-+{
-+	return atomic_read(&au_di(d)->di_generation);
-+}
-+
-+static inline void au_h_dentry_init(struct au_hdentry *hdentry)
-+{
-+	hdentry->hd_dentry = NULL;
-+}
-+
-+static inline void au_hdput(struct au_hdentry *hd)
-+{
-+	if (hd)
-+		dput(hd->hd_dentry);
-+}
-+
-+static inline aufs_bindex_t au_dbstart(struct dentry *dentry)
-+{
-+	DiMustAnyLock(dentry);
-+	return au_di(dentry)->di_bstart;
-+}
-+
-+static inline aufs_bindex_t au_dbend(struct dentry *dentry)
-+{
-+	DiMustAnyLock(dentry);
-+	return au_di(dentry)->di_bend;
-+}
-+
-+static inline aufs_bindex_t au_dbwh(struct dentry *dentry)
-+{
-+	DiMustAnyLock(dentry);
-+	return au_di(dentry)->di_bwh;
-+}
-+
-+static inline aufs_bindex_t au_dbdiropq(struct dentry *dentry)
-+{
-+	DiMustAnyLock(dentry);
-+	return au_di(dentry)->di_bdiropq;
-+}
-+
-+/* todo: hard/soft set? */
-+static inline void au_set_dbstart(struct dentry *dentry, aufs_bindex_t bindex)
-+{
-+	DiMustWriteLock(dentry);
-+	au_di(dentry)->di_bstart = bindex;
-+}
-+
-+static inline void au_set_dbend(struct dentry *dentry, aufs_bindex_t bindex)
-+{
-+	DiMustWriteLock(dentry);
-+	au_di(dentry)->di_bend = bindex;
-+}
-+
-+static inline void au_set_dbwh(struct dentry *dentry, aufs_bindex_t bindex)
-+{
-+	DiMustWriteLock(dentry);
-+	/* dbwh can be outside of bstart - bend range */
-+	au_di(dentry)->di_bwh = bindex;
-+}
-+
-+static inline void au_set_dbdiropq(struct dentry *dentry, aufs_bindex_t bindex)
-+{
-+	DiMustWriteLock(dentry);
-+	au_di(dentry)->di_bdiropq = bindex;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+#ifdef CONFIG_AUFS_HNOTIFY
-+static inline void au_digen_dec(struct dentry *d)
-+{
-+	atomic_dec(&au_di(d)->di_generation);
-+}
-+
-+static inline void au_hn_di_reinit(struct dentry *dentry)
-+{
-+	dentry->d_fsdata = NULL;
-+}
-+#else
-+AuStubVoid(au_hn_di_reinit, struct dentry *dentry __maybe_unused)
-+#endif /* CONFIG_AUFS_HNOTIFY */
-+
-+#endif /* __KERNEL__ */
-+#endif /* __AUFS_DENTRY_H__ */
-diff -Nur linux-4.1.10.orig/fs/aufs/dinfo.c linux-4.1.10/fs/aufs/dinfo.c
---- linux-4.1.10.orig/fs/aufs/dinfo.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/dinfo.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,550 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * dentry private data
-+ */
-+
-+#include "aufs.h"
-+
-+void au_di_init_once(void *_dinfo)
-+{
-+	struct au_dinfo *dinfo = _dinfo;
-+	static struct lock_class_key aufs_di;
-+
-+	au_rw_init(&dinfo->di_rwsem);
-+	au_rw_class(&dinfo->di_rwsem, &aufs_di);
-+}
-+
-+struct au_dinfo *au_di_alloc(struct super_block *sb, unsigned int lsc)
-+{
-+	struct au_dinfo *dinfo;
-+	int nbr, i;
-+
-+	dinfo = au_cache_alloc_dinfo();
-+	if (unlikely(!dinfo))
-+		goto out;
-+
-+	nbr = au_sbend(sb) + 1;
-+	if (nbr <= 0)
-+		nbr = 1;
-+	dinfo->di_hdentry = kcalloc(nbr, sizeof(*dinfo->di_hdentry), GFP_NOFS);
-+	if (dinfo->di_hdentry) {
-+		au_rw_write_lock_nested(&dinfo->di_rwsem, lsc);
-+		dinfo->di_bstart = -1;
-+		dinfo->di_bend = -1;
-+		dinfo->di_bwh = -1;
-+		dinfo->di_bdiropq = -1;
-+		dinfo->di_tmpfile = 0;
-+		for (i = 0; i < nbr; i++)
-+			dinfo->di_hdentry[i].hd_id = -1;
-+		goto out;
-+	}
-+
-+	au_cache_free_dinfo(dinfo);
-+	dinfo = NULL;
-+
-+out:
-+	return dinfo;
-+}
-+
-+void au_di_free(struct au_dinfo *dinfo)
-+{
-+	struct au_hdentry *p;
-+	aufs_bindex_t bend, bindex;
-+
-+	/* dentry may not be revalidated */
-+	bindex = dinfo->di_bstart;
-+	if (bindex >= 0) {
-+		bend = dinfo->di_bend;
-+		p = dinfo->di_hdentry + bindex;
-+		while (bindex++ <= bend)
-+			au_hdput(p++);
-+	}
-+	kfree(dinfo->di_hdentry);
-+	au_cache_free_dinfo(dinfo);
-+}
-+
-+void au_di_swap(struct au_dinfo *a, struct au_dinfo *b)
-+{
-+	struct au_hdentry *p;
-+	aufs_bindex_t bi;
-+
-+	AuRwMustWriteLock(&a->di_rwsem);
-+	AuRwMustWriteLock(&b->di_rwsem);
-+
-+#define DiSwap(v, name)				\
-+	do {					\
-+		v = a->di_##name;		\
-+		a->di_##name = b->di_##name;	\
-+		b->di_##name = v;		\
-+	} while (0)
-+
-+	DiSwap(p, hdentry);
-+	DiSwap(bi, bstart);
-+	DiSwap(bi, bend);
-+	DiSwap(bi, bwh);
-+	DiSwap(bi, bdiropq);
-+	/* smp_mb(); */
-+
-+#undef DiSwap
-+}
-+
-+void au_di_cp(struct au_dinfo *dst, struct au_dinfo *src)
-+{
-+	AuRwMustWriteLock(&dst->di_rwsem);
-+	AuRwMustWriteLock(&src->di_rwsem);
-+
-+	dst->di_bstart = src->di_bstart;
-+	dst->di_bend = src->di_bend;
-+	dst->di_bwh = src->di_bwh;
-+	dst->di_bdiropq = src->di_bdiropq;
-+	/* smp_mb(); */
-+}
-+
-+int au_di_init(struct dentry *dentry)
-+{
-+	int err;
-+	struct super_block *sb;
-+	struct au_dinfo *dinfo;
-+
-+	err = 0;
-+	sb = dentry->d_sb;
-+	dinfo = au_di_alloc(sb, AuLsc_DI_CHILD);
-+	if (dinfo) {
-+		atomic_set(&dinfo->di_generation, au_sigen(sb));
-+		/* smp_mb(); */ /* atomic_set */
-+		dentry->d_fsdata = dinfo;
-+	} else
-+		err = -ENOMEM;
-+
-+	return err;
-+}
-+
-+void au_di_fin(struct dentry *dentry)
-+{
-+	struct au_dinfo *dinfo;
-+
-+	dinfo = au_di(dentry);
-+	AuRwDestroy(&dinfo->di_rwsem);
-+	au_di_free(dinfo);
-+}
-+
-+int au_di_realloc(struct au_dinfo *dinfo, int nbr)
-+{
-+	int err, sz;
-+	struct au_hdentry *hdp;
-+
-+	AuRwMustWriteLock(&dinfo->di_rwsem);
-+
-+	err = -ENOMEM;
-+	sz = sizeof(*hdp) * (dinfo->di_bend + 1);
-+	if (!sz)
-+		sz = sizeof(*hdp);
-+	hdp = au_kzrealloc(dinfo->di_hdentry, sz, sizeof(*hdp) * nbr, GFP_NOFS);
-+	if (hdp) {
-+		dinfo->di_hdentry = hdp;
-+		err = 0;
-+	}
-+
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static void do_ii_write_lock(struct inode *inode, unsigned int lsc)
-+{
-+	switch (lsc) {
-+	case AuLsc_DI_CHILD:
-+		ii_write_lock_child(inode);
-+		break;
-+	case AuLsc_DI_CHILD2:
-+		ii_write_lock_child2(inode);
-+		break;
-+	case AuLsc_DI_CHILD3:
-+		ii_write_lock_child3(inode);
-+		break;
-+	case AuLsc_DI_PARENT:
-+		ii_write_lock_parent(inode);
-+		break;
-+	case AuLsc_DI_PARENT2:
-+		ii_write_lock_parent2(inode);
-+		break;
-+	case AuLsc_DI_PARENT3:
-+		ii_write_lock_parent3(inode);
-+		break;
-+	default:
-+		BUG();
-+	}
-+}
-+
-+static void do_ii_read_lock(struct inode *inode, unsigned int lsc)
-+{
-+	switch (lsc) {
-+	case AuLsc_DI_CHILD:
-+		ii_read_lock_child(inode);
-+		break;
-+	case AuLsc_DI_CHILD2:
-+		ii_read_lock_child2(inode);
-+		break;
-+	case AuLsc_DI_CHILD3:
-+		ii_read_lock_child3(inode);
-+		break;
-+	case AuLsc_DI_PARENT:
-+		ii_read_lock_parent(inode);
-+		break;
-+	case AuLsc_DI_PARENT2:
-+		ii_read_lock_parent2(inode);
-+		break;
-+	case AuLsc_DI_PARENT3:
-+		ii_read_lock_parent3(inode);
-+		break;
-+	default:
-+		BUG();
-+	}
-+}
-+
-+void di_read_lock(struct dentry *d, int flags, unsigned int lsc)
-+{
-+	struct inode *inode;
-+
-+	au_rw_read_lock_nested(&au_di(d)->di_rwsem, lsc);
-+	if (d_really_is_positive(d)) {
-+		inode = d_inode(d);
-+		if (au_ftest_lock(flags, IW))
-+			do_ii_write_lock(inode, lsc);
-+		else if (au_ftest_lock(flags, IR))
-+			do_ii_read_lock(inode, lsc);
-+	}
-+}
-+
-+void di_read_unlock(struct dentry *d, int flags)
-+{
-+	struct inode *inode;
-+
-+	if (d_really_is_positive(d)) {
-+		inode = d_inode(d);
-+		if (au_ftest_lock(flags, IW)) {
-+			au_dbg_verify_dinode(d);
-+			ii_write_unlock(inode);
-+		} else if (au_ftest_lock(flags, IR)) {
-+			au_dbg_verify_dinode(d);
-+			ii_read_unlock(inode);
-+		}
-+	}
-+	au_rw_read_unlock(&au_di(d)->di_rwsem);
-+}
-+
-+void di_downgrade_lock(struct dentry *d, int flags)
-+{
-+	if (d_really_is_positive(d) && au_ftest_lock(flags, IR))
-+		ii_downgrade_lock(d_inode(d));
-+	au_rw_dgrade_lock(&au_di(d)->di_rwsem);
-+}
-+
-+void di_write_lock(struct dentry *d, unsigned int lsc)
-+{
-+	au_rw_write_lock_nested(&au_di(d)->di_rwsem, lsc);
-+	if (d_really_is_positive(d))
-+		do_ii_write_lock(d_inode(d), lsc);
-+}
-+
-+void di_write_unlock(struct dentry *d)
-+{
-+	au_dbg_verify_dinode(d);
-+	if (d_really_is_positive(d))
-+		ii_write_unlock(d_inode(d));
-+	au_rw_write_unlock(&au_di(d)->di_rwsem);
-+}
-+
-+void di_write_lock2_child(struct dentry *d1, struct dentry *d2, int isdir)
-+{
-+	AuDebugOn(d1 == d2
-+		  || d_inode(d1) == d_inode(d2)
-+		  || d1->d_sb != d2->d_sb);
-+
-+	if (isdir && au_test_subdir(d1, d2)) {
-+		di_write_lock_child(d1);
-+		di_write_lock_child2(d2);
-+	} else {
-+		/* there should be no races */
-+		di_write_lock_child(d2);
-+		di_write_lock_child2(d1);
-+	}
-+}
-+
-+void di_write_lock2_parent(struct dentry *d1, struct dentry *d2, int isdir)
-+{
-+	AuDebugOn(d1 == d2
-+		  || d_inode(d1) == d_inode(d2)
-+		  || d1->d_sb != d2->d_sb);
-+
-+	if (isdir && au_test_subdir(d1, d2)) {
-+		di_write_lock_parent(d1);
-+		di_write_lock_parent2(d2);
-+	} else {
-+		/* there should be no races */
-+		di_write_lock_parent(d2);
-+		di_write_lock_parent2(d1);
-+	}
-+}
-+
-+void di_write_unlock2(struct dentry *d1, struct dentry *d2)
-+{
-+	di_write_unlock(d1);
-+	if (d_inode(d1) == d_inode(d2))
-+		au_rw_write_unlock(&au_di(d2)->di_rwsem);
-+	else
-+		di_write_unlock(d2);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+struct dentry *au_h_dptr(struct dentry *dentry, aufs_bindex_t bindex)
-+{
-+	struct dentry *d;
-+
-+	DiMustAnyLock(dentry);
-+
-+	if (au_dbstart(dentry) < 0 || bindex < au_dbstart(dentry))
-+		return NULL;
-+	AuDebugOn(bindex < 0);
-+	d = au_di(dentry)->di_hdentry[0 + bindex].hd_dentry;
-+	AuDebugOn(d && au_dcount(d) <= 0);
-+	return d;
-+}
-+
-+/*
-+ * extended version of au_h_dptr().
-+ * returns a hashed and positive (or linkable) h_dentry in bindex, NULL, or
-+ * error.
-+ */
-+struct dentry *au_h_d_alias(struct dentry *dentry, aufs_bindex_t bindex)
-+{
-+	struct dentry *h_dentry;
-+	struct inode *inode, *h_inode;
-+
-+	AuDebugOn(d_really_is_negative(dentry));
-+
-+	h_dentry = NULL;
-+	if (au_dbstart(dentry) <= bindex
-+	    && bindex <= au_dbend(dentry))
-+		h_dentry = au_h_dptr(dentry, bindex);
-+	if (h_dentry && !au_d_linkable(h_dentry)) {
-+		dget(h_dentry);
-+		goto out; /* success */
-+	}
-+
-+	inode = d_inode(dentry);
-+	AuDebugOn(bindex < au_ibstart(inode));
-+	AuDebugOn(au_ibend(inode) < bindex);
-+	h_inode = au_h_iptr(inode, bindex);
-+	h_dentry = d_find_alias(h_inode);
-+	if (h_dentry) {
-+		if (!IS_ERR(h_dentry)) {
-+			if (!au_d_linkable(h_dentry))
-+				goto out; /* success */
-+			dput(h_dentry);
-+		} else
-+			goto out;
-+	}
-+
-+	if (au_opt_test(au_mntflags(dentry->d_sb), PLINK)) {
-+		h_dentry = au_plink_lkup(inode, bindex);
-+		AuDebugOn(!h_dentry);
-+		if (!IS_ERR(h_dentry)) {
-+			if (!au_d_hashed_positive(h_dentry))
-+				goto out; /* success */
-+			dput(h_dentry);
-+			h_dentry = NULL;
-+		}
-+	}
-+
-+out:
-+	AuDbgDentry(h_dentry);
-+	return h_dentry;
-+}
-+
-+aufs_bindex_t au_dbtail(struct dentry *dentry)
-+{
-+	aufs_bindex_t bend, bwh;
-+
-+	bend = au_dbend(dentry);
-+	if (0 <= bend) {
-+		bwh = au_dbwh(dentry);
-+		if (!bwh)
-+			return bwh;
-+		if (0 < bwh && bwh < bend)
-+			return bwh - 1;
-+	}
-+	return bend;
-+}
-+
-+aufs_bindex_t au_dbtaildir(struct dentry *dentry)
-+{
-+	aufs_bindex_t bend, bopq;
-+
-+	bend = au_dbtail(dentry);
-+	if (0 <= bend) {
-+		bopq = au_dbdiropq(dentry);
-+		if (0 <= bopq && bopq < bend)
-+			bend = bopq;
-+	}
-+	return bend;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+void au_set_h_dptr(struct dentry *dentry, aufs_bindex_t bindex,
-+		   struct dentry *h_dentry)
-+{
-+	struct au_hdentry *hd = au_di(dentry)->di_hdentry + bindex;
-+	struct au_branch *br;
-+
-+	DiMustWriteLock(dentry);
-+
-+	au_hdput(hd);
-+	hd->hd_dentry = h_dentry;
-+	if (h_dentry) {
-+		br = au_sbr(dentry->d_sb, bindex);
-+		hd->hd_id = br->br_id;
-+	}
-+}
-+
-+int au_dbrange_test(struct dentry *dentry)
-+{
-+	int err;
-+	aufs_bindex_t bstart, bend;
-+
-+	err = 0;
-+	bstart = au_dbstart(dentry);
-+	bend = au_dbend(dentry);
-+	if (bstart >= 0)
-+		AuDebugOn(bend < 0 && bstart > bend);
-+	else {
-+		err = -EIO;
-+		AuDebugOn(bend >= 0);
-+	}
-+
-+	return err;
-+}
-+
-+int au_digen_test(struct dentry *dentry, unsigned int sigen)
-+{
-+	int err;
-+
-+	err = 0;
-+	if (unlikely(au_digen(dentry) != sigen
-+		     || au_iigen_test(d_inode(dentry), sigen)))
-+		err = -EIO;
-+
-+	return err;
-+}
-+
-+void au_update_digen(struct dentry *dentry)
-+{
-+	atomic_set(&au_di(dentry)->di_generation, au_sigen(dentry->d_sb));
-+	/* smp_mb(); */ /* atomic_set */
-+}
-+
-+void au_update_dbrange(struct dentry *dentry, int do_put_zero)
-+{
-+	struct au_dinfo *dinfo;
-+	struct dentry *h_d;
-+	struct au_hdentry *hdp;
-+
-+	DiMustWriteLock(dentry);
-+
-+	dinfo = au_di(dentry);
-+	if (!dinfo || dinfo->di_bstart < 0)
-+		return;
-+
-+	hdp = dinfo->di_hdentry;
-+	if (do_put_zero) {
-+		aufs_bindex_t bindex, bend;
-+
-+		bend = dinfo->di_bend;
-+		for (bindex = dinfo->di_bstart; bindex <= bend; bindex++) {
-+			h_d = hdp[0 + bindex].hd_dentry;
-+			if (h_d && d_is_negative(h_d))
-+				au_set_h_dptr(dentry, bindex, NULL);
-+		}
-+	}
-+
-+	dinfo->di_bstart = -1;
-+	while (++dinfo->di_bstart <= dinfo->di_bend)
-+		if (hdp[0 + dinfo->di_bstart].hd_dentry)
-+			break;
-+	if (dinfo->di_bstart > dinfo->di_bend) {
-+		dinfo->di_bstart = -1;
-+		dinfo->di_bend = -1;
-+		return;
-+	}
-+
-+	dinfo->di_bend++;
-+	while (0 <= --dinfo->di_bend)
-+		if (hdp[0 + dinfo->di_bend].hd_dentry)
-+			break;
-+	AuDebugOn(dinfo->di_bstart > dinfo->di_bend || dinfo->di_bend < 0);
-+}
-+
-+void au_update_dbstart(struct dentry *dentry)
-+{
-+	aufs_bindex_t bindex, bend;
-+	struct dentry *h_dentry;
-+
-+	bend = au_dbend(dentry);
-+	for (bindex = au_dbstart(dentry); bindex <= bend; bindex++) {
-+		h_dentry = au_h_dptr(dentry, bindex);
-+		if (!h_dentry)
-+			continue;
-+		if (d_is_positive(h_dentry)) {
-+			au_set_dbstart(dentry, bindex);
-+			return;
-+		}
-+		au_set_h_dptr(dentry, bindex, NULL);
-+	}
-+}
-+
-+void au_update_dbend(struct dentry *dentry)
-+{
-+	aufs_bindex_t bindex, bstart;
-+	struct dentry *h_dentry;
-+
-+	bstart = au_dbstart(dentry);
-+	for (bindex = au_dbend(dentry); bindex >= bstart; bindex--) {
-+		h_dentry = au_h_dptr(dentry, bindex);
-+		if (!h_dentry)
-+			continue;
-+		if (d_is_positive(h_dentry)) {
-+			au_set_dbend(dentry, bindex);
-+			return;
-+		}
-+		au_set_h_dptr(dentry, bindex, NULL);
-+	}
-+}
-+
-+int au_find_dbindex(struct dentry *dentry, struct dentry *h_dentry)
-+{
-+	aufs_bindex_t bindex, bend;
-+
-+	bend = au_dbend(dentry);
-+	for (bindex = au_dbstart(dentry); bindex <= bend; bindex++)
-+		if (au_h_dptr(dentry, bindex) == h_dentry)
-+			return bindex;
-+	return -1;
-+}
-diff -Nur linux-4.1.10.orig/fs/aufs/dir.c linux-4.1.10/fs/aufs/dir.c
---- linux-4.1.10.orig/fs/aufs/dir.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/dir.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,753 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * directory operations
-+ */
-+
-+#include <linux/fs_stack.h>
-+#include "aufs.h"
-+
-+void au_add_nlink(struct inode *dir, struct inode *h_dir)
-+{
-+	unsigned int nlink;
-+
-+	AuDebugOn(!S_ISDIR(dir->i_mode) || !S_ISDIR(h_dir->i_mode));
-+
-+	nlink = dir->i_nlink;
-+	nlink += h_dir->i_nlink - 2;
-+	if (h_dir->i_nlink < 2)
-+		nlink += 2;
-+	smp_mb(); /* for i_nlink */
-+	/* 0 can happen in revaliding */
-+	set_nlink(dir, nlink);
-+}
-+
-+void au_sub_nlink(struct inode *dir, struct inode *h_dir)
-+{
-+	unsigned int nlink;
-+
-+	AuDebugOn(!S_ISDIR(dir->i_mode) || !S_ISDIR(h_dir->i_mode));
-+
-+	nlink = dir->i_nlink;
-+	nlink -= h_dir->i_nlink - 2;
-+	if (h_dir->i_nlink < 2)
-+		nlink -= 2;
-+	smp_mb(); /* for i_nlink */
-+	/* nlink == 0 means the branch-fs is broken */
-+	set_nlink(dir, nlink);
-+}
-+
-+loff_t au_dir_size(struct file *file, struct dentry *dentry)
-+{
-+	loff_t sz;
-+	aufs_bindex_t bindex, bend;
-+	struct file *h_file;
-+	struct dentry *h_dentry;
-+
-+	sz = 0;
-+	if (file) {
-+		AuDebugOn(!d_is_dir(file->f_path.dentry));
-+
-+		bend = au_fbend_dir(file);
-+		for (bindex = au_fbstart(file);
-+		     bindex <= bend && sz < KMALLOC_MAX_SIZE;
-+		     bindex++) {
-+			h_file = au_hf_dir(file, bindex);
-+			if (h_file && file_inode(h_file))
-+				sz += vfsub_f_size_read(h_file);
-+		}
-+	} else {
-+		AuDebugOn(!dentry);
-+		AuDebugOn(!d_is_dir(dentry));
-+
-+		bend = au_dbtaildir(dentry);
-+		for (bindex = au_dbstart(dentry);
-+		     bindex <= bend && sz < KMALLOC_MAX_SIZE;
-+		     bindex++) {
-+			h_dentry = au_h_dptr(dentry, bindex);
-+			if (h_dentry && d_is_positive(h_dentry))
-+				sz += i_size_read(d_inode(h_dentry));
-+		}
-+	}
-+	if (sz < KMALLOC_MAX_SIZE)
-+		sz = roundup_pow_of_two(sz);
-+	if (sz > KMALLOC_MAX_SIZE)
-+		sz = KMALLOC_MAX_SIZE;
-+	else if (sz < NAME_MAX) {
-+		BUILD_BUG_ON(AUFS_RDBLK_DEF < NAME_MAX);
-+		sz = AUFS_RDBLK_DEF;
-+	}
-+	return sz;
-+}
-+
-+struct au_dir_ts_arg {
-+	struct dentry *dentry;
-+	aufs_bindex_t brid;
-+};
-+
-+static void au_do_dir_ts(void *arg)
-+{
-+	struct au_dir_ts_arg *a = arg;
-+	struct au_dtime dt;
-+	struct path h_path;
-+	struct inode *dir, *h_dir;
-+	struct super_block *sb;
-+	struct au_branch *br;
-+	struct au_hinode *hdir;
-+	int err;
-+	aufs_bindex_t bstart, bindex;
-+
-+	sb = a->dentry->d_sb;
-+	if (d_really_is_negative(a->dentry))
-+		goto out;
-+	aufs_read_lock(a->dentry, AuLock_DW | AuLock_DIR); /* noflush */
-+
-+	/* no dir->i_mutex lock */
-+	dir = d_inode(a->dentry);
-+	bstart = au_ibstart(dir);
-+	bindex = au_br_index(sb, a->brid);
-+	if (bindex < bstart)
-+		goto out_unlock;
-+
-+	br = au_sbr(sb, bindex);
-+	h_path.dentry = au_h_dptr(a->dentry, bindex);
-+	if (!h_path.dentry)
-+		goto out_unlock;
-+	h_path.mnt = au_br_mnt(br);
-+	au_dtime_store(&dt, a->dentry, &h_path);
-+
-+	br = au_sbr(sb, bstart);
-+	if (!au_br_writable(br->br_perm))
-+		goto out_unlock;
-+	h_path.dentry = au_h_dptr(a->dentry, bstart);
-+	h_path.mnt = au_br_mnt(br);
-+	err = vfsub_mnt_want_write(h_path.mnt);
-+	if (err)
-+		goto out_unlock;
-+	hdir = au_hi(dir, bstart);
-+	au_hn_imtx_lock_nested(hdir, AuLsc_I_PARENT);
-+	h_dir = au_h_iptr(dir, bstart);
-+	if (h_dir->i_nlink
-+	    && timespec_compare(&h_dir->i_mtime, &dt.dt_mtime) < 0) {
-+		dt.dt_h_path = h_path;
-+		au_dtime_revert(&dt);
-+	}
-+	au_hn_imtx_unlock(hdir);
-+	vfsub_mnt_drop_write(h_path.mnt);
-+	au_cpup_attr_timesizes(dir);
-+
-+out_unlock:
-+	aufs_read_unlock(a->dentry, AuLock_DW);
-+out:
-+	dput(a->dentry);
-+	au_nwt_done(&au_sbi(sb)->si_nowait);
-+	kfree(arg);
-+}
-+
-+void au_dir_ts(struct inode *dir, aufs_bindex_t bindex)
-+{
-+	int perm, wkq_err;
-+	aufs_bindex_t bstart;
-+	struct au_dir_ts_arg *arg;
-+	struct dentry *dentry;
-+	struct super_block *sb;
-+
-+	IMustLock(dir);
-+
-+	dentry = d_find_any_alias(dir);
-+	AuDebugOn(!dentry);
-+	sb = dentry->d_sb;
-+	bstart = au_ibstart(dir);
-+	if (bstart == bindex) {
-+		au_cpup_attr_timesizes(dir);
-+		goto out;
-+	}
-+
-+	perm = au_sbr_perm(sb, bstart);
-+	if (!au_br_writable(perm))
-+		goto out;
-+
-+	arg = kmalloc(sizeof(*arg), GFP_NOFS);
-+	if (!arg)
-+		goto out;
-+
-+	arg->dentry = dget(dentry); /* will be dput-ted by au_do_dir_ts() */
-+	arg->brid = au_sbr_id(sb, bindex);
-+	wkq_err = au_wkq_nowait(au_do_dir_ts, arg, sb, /*flags*/0);
-+	if (unlikely(wkq_err)) {
-+		pr_err("wkq %d\n", wkq_err);
-+		dput(dentry);
-+		kfree(arg);
-+	}
-+
-+out:
-+	dput(dentry);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static int reopen_dir(struct file *file)
-+{
-+	int err;
-+	unsigned int flags;
-+	aufs_bindex_t bindex, btail, bstart;
-+	struct dentry *dentry, *h_dentry;
-+	struct file *h_file;
-+
-+	/* open all lower dirs */
-+	dentry = file->f_path.dentry;
-+	bstart = au_dbstart(dentry);
-+	for (bindex = au_fbstart(file); bindex < bstart; bindex++)
-+		au_set_h_fptr(file, bindex, NULL);
-+	au_set_fbstart(file, bstart);
-+
-+	btail = au_dbtaildir(dentry);
-+	for (bindex = au_fbend_dir(file); btail < bindex; bindex--)
-+		au_set_h_fptr(file, bindex, NULL);
-+	au_set_fbend_dir(file, btail);
-+
-+	flags = vfsub_file_flags(file);
-+	for (bindex = bstart; bindex <= btail; bindex++) {
-+		h_dentry = au_h_dptr(dentry, bindex);
-+		if (!h_dentry)
-+			continue;
-+		h_file = au_hf_dir(file, bindex);
-+		if (h_file)
-+			continue;
-+
-+		h_file = au_h_open(dentry, bindex, flags, file, /*force_wr*/0);
-+		err = PTR_ERR(h_file);
-+		if (IS_ERR(h_file))
-+			goto out; /* close all? */
-+		au_set_h_fptr(file, bindex, h_file);
-+	}
-+	au_update_figen(file);
-+	/* todo: necessary? */
-+	/* file->f_ra = h_file->f_ra; */
-+	err = 0;
-+
-+out:
-+	return err;
-+}
-+
-+static int do_open_dir(struct file *file, int flags, struct file *h_file)
-+{
-+	int err;
-+	aufs_bindex_t bindex, btail;
-+	struct dentry *dentry, *h_dentry;
-+
-+	FiMustWriteLock(file);
-+	AuDebugOn(h_file);
-+
-+	err = 0;
-+	dentry = file->f_path.dentry;
-+	file->f_version = d_inode(dentry)->i_version;
-+	bindex = au_dbstart(dentry);
-+	au_set_fbstart(file, bindex);
-+	btail = au_dbtaildir(dentry);
-+	au_set_fbend_dir(file, btail);
-+	for (; !err && bindex <= btail; bindex++) {
-+		h_dentry = au_h_dptr(dentry, bindex);
-+		if (!h_dentry)
-+			continue;
-+
-+		h_file = au_h_open(dentry, bindex, flags, file, /*force_wr*/0);
-+		if (IS_ERR(h_file)) {
-+			err = PTR_ERR(h_file);
-+			break;
-+		}
-+		au_set_h_fptr(file, bindex, h_file);
-+	}
-+	au_update_figen(file);
-+	/* todo: necessary? */
-+	/* file->f_ra = h_file->f_ra; */
-+	if (!err)
-+		return 0; /* success */
-+
-+	/* close all */
-+	for (bindex = au_fbstart(file); bindex <= btail; bindex++)
-+		au_set_h_fptr(file, bindex, NULL);
-+	au_set_fbstart(file, -1);
-+	au_set_fbend_dir(file, -1);
-+
-+	return err;
-+}
-+
-+static int aufs_open_dir(struct inode *inode __maybe_unused,
-+			 struct file *file)
-+{
-+	int err;
-+	struct super_block *sb;
-+	struct au_fidir *fidir;
-+
-+	err = -ENOMEM;
-+	sb = file->f_path.dentry->d_sb;
-+	si_read_lock(sb, AuLock_FLUSH);
-+	fidir = au_fidir_alloc(sb);
-+	if (fidir) {
-+		struct au_do_open_args args = {
-+			.open	= do_open_dir,
-+			.fidir	= fidir
-+		};
-+		err = au_do_open(file, &args);
-+		if (unlikely(err))
-+			kfree(fidir);
-+	}
-+	si_read_unlock(sb);
-+	return err;
-+}
-+
-+static int aufs_release_dir(struct inode *inode __maybe_unused,
-+			    struct file *file)
-+{
-+	struct au_vdir *vdir_cache;
-+	struct au_finfo *finfo;
-+	struct au_fidir *fidir;
-+	aufs_bindex_t bindex, bend;
-+
-+	finfo = au_fi(file);
-+	fidir = finfo->fi_hdir;
-+	if (fidir) {
-+		au_sphl_del(&finfo->fi_hlist,
-+			    &au_sbi(file->f_path.dentry->d_sb)->si_files);
-+		vdir_cache = fidir->fd_vdir_cache; /* lock-free */
-+		if (vdir_cache)
-+			au_vdir_free(vdir_cache);
-+
-+		bindex = finfo->fi_btop;
-+		if (bindex >= 0) {
-+			/*
-+			 * calls fput() instead of filp_close(),
-+			 * since no dnotify or lock for the lower file.
-+			 */
-+			bend = fidir->fd_bbot;
-+			for (; bindex <= bend; bindex++)
-+				au_set_h_fptr(file, bindex, NULL);
-+		}
-+		kfree(fidir);
-+		finfo->fi_hdir = NULL;
-+	}
-+	au_finfo_fin(file);
-+	return 0;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static int au_do_flush_dir(struct file *file, fl_owner_t id)
-+{
-+	int err;
-+	aufs_bindex_t bindex, bend;
-+	struct file *h_file;
-+
-+	err = 0;
-+	bend = au_fbend_dir(file);
-+	for (bindex = au_fbstart(file); !err && bindex <= bend; bindex++) {
-+		h_file = au_hf_dir(file, bindex);
-+		if (h_file)
-+			err = vfsub_flush(h_file, id);
-+	}
-+	return err;
-+}
-+
-+static int aufs_flush_dir(struct file *file, fl_owner_t id)
-+{
-+	return au_do_flush(file, id, au_do_flush_dir);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static int au_do_fsync_dir_no_file(struct dentry *dentry, int datasync)
-+{
-+	int err;
-+	aufs_bindex_t bend, bindex;
-+	struct inode *inode;
-+	struct super_block *sb;
-+
-+	err = 0;
-+	sb = dentry->d_sb;
-+	inode = d_inode(dentry);
-+	IMustLock(inode);
-+	bend = au_dbend(dentry);
-+	for (bindex = au_dbstart(dentry); !err && bindex <= bend; bindex++) {
-+		struct path h_path;
-+
-+		if (au_test_ro(sb, bindex, inode))
-+			continue;
-+		h_path.dentry = au_h_dptr(dentry, bindex);
-+		if (!h_path.dentry)
-+			continue;
-+
-+		h_path.mnt = au_sbr_mnt(sb, bindex);
-+		err = vfsub_fsync(NULL, &h_path, datasync);
-+	}
-+
-+	return err;
-+}
-+
-+static int au_do_fsync_dir(struct file *file, int datasync)
-+{
-+	int err;
-+	aufs_bindex_t bend, bindex;
-+	struct file *h_file;
-+	struct super_block *sb;
-+	struct inode *inode;
-+
-+	err = au_reval_and_lock_fdi(file, reopen_dir, /*wlock*/1);
-+	if (unlikely(err))
-+		goto out;
-+
-+	inode = file_inode(file);
-+	sb = inode->i_sb;
-+	bend = au_fbend_dir(file);
-+	for (bindex = au_fbstart(file); !err && bindex <= bend; bindex++) {
-+		h_file = au_hf_dir(file, bindex);
-+		if (!h_file || au_test_ro(sb, bindex, inode))
-+			continue;
-+
-+		err = vfsub_fsync(h_file, &h_file->f_path, datasync);
-+	}
-+
-+out:
-+	return err;
-+}
-+
-+/*
-+ * @file may be NULL
-+ */
-+static int aufs_fsync_dir(struct file *file, loff_t start, loff_t end,
-+			  int datasync)
-+{
-+	int err;
-+	struct dentry *dentry;
-+	struct inode *inode;
-+	struct super_block *sb;
-+	struct mutex *mtx;
-+
-+	err = 0;
-+	dentry = file->f_path.dentry;
-+	inode = d_inode(dentry);
-+	mtx = &inode->i_mutex;
-+	mutex_lock(mtx);
-+	sb = dentry->d_sb;
-+	si_noflush_read_lock(sb);
-+	if (file)
-+		err = au_do_fsync_dir(file, datasync);
-+	else {
-+		di_write_lock_child(dentry);
-+		err = au_do_fsync_dir_no_file(dentry, datasync);
-+	}
-+	au_cpup_attr_timesizes(inode);
-+	di_write_unlock(dentry);
-+	if (file)
-+		fi_write_unlock(file);
-+
-+	si_read_unlock(sb);
-+	mutex_unlock(mtx);
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static int aufs_iterate(struct file *file, struct dir_context *ctx)
-+{
-+	int err;
-+	struct dentry *dentry;
-+	struct inode *inode, *h_inode;
-+	struct super_block *sb;
-+
-+	AuDbg("%pD, ctx{%pf, %llu}\n", file, ctx->actor, ctx->pos);
-+
-+	dentry = file->f_path.dentry;
-+	inode = d_inode(dentry);
-+	IMustLock(inode);
-+
-+	sb = dentry->d_sb;
-+	si_read_lock(sb, AuLock_FLUSH);
-+	err = au_reval_and_lock_fdi(file, reopen_dir, /*wlock*/1);
-+	if (unlikely(err))
-+		goto out;
-+	err = au_alive_dir(dentry);
-+	if (!err)
-+		err = au_vdir_init(file);
-+	di_downgrade_lock(dentry, AuLock_IR);
-+	if (unlikely(err))
-+		goto out_unlock;
-+
-+	h_inode = au_h_iptr(inode, au_ibstart(inode));
-+	if (!au_test_nfsd()) {
-+		err = au_vdir_fill_de(file, ctx);
-+		fsstack_copy_attr_atime(inode, h_inode);
-+	} else {
-+		/*
-+		 * nfsd filldir may call lookup_one_len(), vfs_getattr(),
-+		 * encode_fh() and others.
-+		 */
-+		atomic_inc(&h_inode->i_count);
-+		di_read_unlock(dentry, AuLock_IR);
-+		si_read_unlock(sb);
-+		err = au_vdir_fill_de(file, ctx);
-+		fsstack_copy_attr_atime(inode, h_inode);
-+		fi_write_unlock(file);
-+		iput(h_inode);
-+
-+		AuTraceErr(err);
-+		return err;
-+	}
-+
-+out_unlock:
-+	di_read_unlock(dentry, AuLock_IR);
-+	fi_write_unlock(file);
-+out:
-+	si_read_unlock(sb);
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+#define AuTestEmpty_WHONLY	1
-+#define AuTestEmpty_CALLED	(1 << 1)
-+#define AuTestEmpty_SHWH	(1 << 2)
-+#define au_ftest_testempty(flags, name)	((flags) & AuTestEmpty_##name)
-+#define au_fset_testempty(flags, name) \
-+	do { (flags) |= AuTestEmpty_##name; } while (0)
-+#define au_fclr_testempty(flags, name) \
-+	do { (flags) &= ~AuTestEmpty_##name; } while (0)
-+
-+#ifndef CONFIG_AUFS_SHWH
-+#undef AuTestEmpty_SHWH
-+#define AuTestEmpty_SHWH	0
-+#endif
-+
-+struct test_empty_arg {
-+	struct dir_context ctx;
-+	struct au_nhash *whlist;
-+	unsigned int flags;
-+	int err;
-+	aufs_bindex_t bindex;
-+};
-+
-+static int test_empty_cb(struct dir_context *ctx, const char *__name,
-+			 int namelen, loff_t offset __maybe_unused, u64 ino,
-+			 unsigned int d_type)
-+{
-+	struct test_empty_arg *arg = container_of(ctx, struct test_empty_arg,
-+						  ctx);
-+	char *name = (void *)__name;
-+
-+	arg->err = 0;
-+	au_fset_testempty(arg->flags, CALLED);
-+	/* smp_mb(); */
-+	if (name[0] == '.'
-+	    && (namelen == 1 || (name[1] == '.' && namelen == 2)))
-+		goto out; /* success */
-+
-+	if (namelen <= AUFS_WH_PFX_LEN
-+	    || memcmp(name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) {
-+		if (au_ftest_testempty(arg->flags, WHONLY)
-+		    && !au_nhash_test_known_wh(arg->whlist, name, namelen))
-+			arg->err = -ENOTEMPTY;
-+		goto out;
-+	}
-+
-+	name += AUFS_WH_PFX_LEN;
-+	namelen -= AUFS_WH_PFX_LEN;
-+	if (!au_nhash_test_known_wh(arg->whlist, name, namelen))
-+		arg->err = au_nhash_append_wh
-+			(arg->whlist, name, namelen, ino, d_type, arg->bindex,
-+			 au_ftest_testempty(arg->flags, SHWH));
-+
-+out:
-+	/* smp_mb(); */
-+	AuTraceErr(arg->err);
-+	return arg->err;
-+}
-+
-+static int do_test_empty(struct dentry *dentry, struct test_empty_arg *arg)
-+{
-+	int err;
-+	struct file *h_file;
-+
-+	h_file = au_h_open(dentry, arg->bindex,
-+			   O_RDONLY | O_NONBLOCK | O_DIRECTORY | O_LARGEFILE,
-+			   /*file*/NULL, /*force_wr*/0);
-+	err = PTR_ERR(h_file);
-+	if (IS_ERR(h_file))
-+		goto out;
-+
-+	err = 0;
-+	if (!au_opt_test(au_mntflags(dentry->d_sb), UDBA_NONE)
-+	    && !file_inode(h_file)->i_nlink)
-+		goto out_put;
-+
-+	do {
-+		arg->err = 0;
-+		au_fclr_testempty(arg->flags, CALLED);
-+		/* smp_mb(); */
-+		err = vfsub_iterate_dir(h_file, &arg->ctx);
-+		if (err >= 0)
-+			err = arg->err;
-+	} while (!err && au_ftest_testempty(arg->flags, CALLED));
-+
-+out_put:
-+	fput(h_file);
-+	au_sbr_put(dentry->d_sb, arg->bindex);
-+out:
-+	return err;
-+}
-+
-+struct do_test_empty_args {
-+	int *errp;
-+	struct dentry *dentry;
-+	struct test_empty_arg *arg;
-+};
-+
-+static void call_do_test_empty(void *args)
-+{
-+	struct do_test_empty_args *a = args;
-+	*a->errp = do_test_empty(a->dentry, a->arg);
-+}
-+
-+static int sio_test_empty(struct dentry *dentry, struct test_empty_arg *arg)
-+{
-+	int err, wkq_err;
-+	struct dentry *h_dentry;
-+	struct inode *h_inode;
-+
-+	h_dentry = au_h_dptr(dentry, arg->bindex);
-+	h_inode = d_inode(h_dentry);
-+	/* todo: i_mode changes anytime? */
-+	mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
-+	err = au_test_h_perm_sio(h_inode, MAY_EXEC | MAY_READ);
-+	mutex_unlock(&h_inode->i_mutex);
-+	if (!err)
-+		err = do_test_empty(dentry, arg);
-+	else {
-+		struct do_test_empty_args args = {
-+			.errp	= &err,
-+			.dentry	= dentry,
-+			.arg	= arg
-+		};
-+		unsigned int flags = arg->flags;
-+
-+		wkq_err = au_wkq_wait(call_do_test_empty, &args);
-+		if (unlikely(wkq_err))
-+			err = wkq_err;
-+		arg->flags = flags;
-+	}
-+
-+	return err;
-+}
-+
-+int au_test_empty_lower(struct dentry *dentry)
-+{
-+	int err;
-+	unsigned int rdhash;
-+	aufs_bindex_t bindex, bstart, btail;
-+	struct au_nhash whlist;
-+	struct test_empty_arg arg = {
-+		.ctx = {
-+			.actor = test_empty_cb
-+		}
-+	};
-+	int (*test_empty)(struct dentry *dentry, struct test_empty_arg *arg);
-+
-+	SiMustAnyLock(dentry->d_sb);
-+
-+	rdhash = au_sbi(dentry->d_sb)->si_rdhash;
-+	if (!rdhash)
-+		rdhash = au_rdhash_est(au_dir_size(/*file*/NULL, dentry));
-+	err = au_nhash_alloc(&whlist, rdhash, GFP_NOFS);
-+	if (unlikely(err))
-+		goto out;
-+
-+	arg.flags = 0;
-+	arg.whlist = &whlist;
-+	bstart = au_dbstart(dentry);
-+	if (au_opt_test(au_mntflags(dentry->d_sb), SHWH))
-+		au_fset_testempty(arg.flags, SHWH);
-+	test_empty = do_test_empty;
-+	if (au_opt_test(au_mntflags(dentry->d_sb), DIRPERM1))
-+		test_empty = sio_test_empty;
-+	arg.bindex = bstart;
-+	err = test_empty(dentry, &arg);
-+	if (unlikely(err))
-+		goto out_whlist;
-+
-+	au_fset_testempty(arg.flags, WHONLY);
-+	btail = au_dbtaildir(dentry);
-+	for (bindex = bstart + 1; !err && bindex <= btail; bindex++) {
-+		struct dentry *h_dentry;
-+
-+		h_dentry = au_h_dptr(dentry, bindex);
-+		if (h_dentry && d_is_positive(h_dentry)) {
-+			arg.bindex = bindex;
-+			err = test_empty(dentry, &arg);
-+		}
-+	}
-+
-+out_whlist:
-+	au_nhash_wh_free(&whlist);
-+out:
-+	return err;
-+}
-+
-+int au_test_empty(struct dentry *dentry, struct au_nhash *whlist)
-+{
-+	int err;
-+	struct test_empty_arg arg = {
-+		.ctx = {
-+			.actor = test_empty_cb
-+		}
-+	};
-+	aufs_bindex_t bindex, btail;
-+
-+	err = 0;
-+	arg.whlist = whlist;
-+	arg.flags = AuTestEmpty_WHONLY;
-+	if (au_opt_test(au_mntflags(dentry->d_sb), SHWH))
-+		au_fset_testempty(arg.flags, SHWH);
-+	btail = au_dbtaildir(dentry);
-+	for (bindex = au_dbstart(dentry); !err && bindex <= btail; bindex++) {
-+		struct dentry *h_dentry;
-+
-+		h_dentry = au_h_dptr(dentry, bindex);
-+		if (h_dentry && d_is_positive(h_dentry)) {
-+			arg.bindex = bindex;
-+			err = sio_test_empty(dentry, &arg);
-+		}
-+	}
-+
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+const struct file_operations aufs_dir_fop = {
-+	.owner		= THIS_MODULE,
-+	.llseek		= default_llseek,
-+	.read		= generic_read_dir,
-+	.iterate	= aufs_iterate,
-+	.unlocked_ioctl	= aufs_ioctl_dir,
-+#ifdef CONFIG_COMPAT
-+	.compat_ioctl	= aufs_compat_ioctl_dir,
-+#endif
-+	.open		= aufs_open_dir,
-+	.release	= aufs_release_dir,
-+	.flush		= aufs_flush_dir,
-+	.fsync		= aufs_fsync_dir
-+};
-diff -Nur linux-4.1.10.orig/fs/aufs/dir.h linux-4.1.10/fs/aufs/dir.h
---- linux-4.1.10.orig/fs/aufs/dir.h	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/dir.h	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,131 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * directory operations
-+ */
-+
-+#ifndef __AUFS_DIR_H__
-+#define __AUFS_DIR_H__
-+
-+#ifdef __KERNEL__
-+
-+#include <linux/fs.h>
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* need to be faster and smaller */
-+
-+struct au_nhash {
-+	unsigned int		nh_num;
-+	struct hlist_head	*nh_head;
-+};
-+
-+struct au_vdir_destr {
-+	unsigned char	len;
-+	unsigned char	name[0];
-+} __packed;
-+
-+struct au_vdir_dehstr {
-+	struct hlist_node	hash;
-+	struct au_vdir_destr	*str;
-+} ____cacheline_aligned_in_smp;
-+
-+struct au_vdir_de {
-+	ino_t			de_ino;
-+	unsigned char		de_type;
-+	/* caution: packed */
-+	struct au_vdir_destr	de_str;
-+} __packed;
-+
-+struct au_vdir_wh {
-+	struct hlist_node	wh_hash;
-+#ifdef CONFIG_AUFS_SHWH
-+	ino_t			wh_ino;
-+	aufs_bindex_t		wh_bindex;
-+	unsigned char		wh_type;
-+#else
-+	aufs_bindex_t		wh_bindex;
-+#endif
-+	/* caution: packed */
-+	struct au_vdir_destr	wh_str;
-+} __packed;
-+
-+union au_vdir_deblk_p {
-+	unsigned char		*deblk;
-+	struct au_vdir_de	*de;
-+};
-+
-+struct au_vdir {
-+	unsigned char	**vd_deblk;
-+	unsigned long	vd_nblk;
-+	struct {
-+		unsigned long		ul;
-+		union au_vdir_deblk_p	p;
-+	} vd_last;
-+
-+	unsigned long	vd_version;
-+	unsigned int	vd_deblk_sz;
-+	unsigned long	vd_jiffy;
-+} ____cacheline_aligned_in_smp;
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* dir.c */
-+extern const struct file_operations aufs_dir_fop;
-+void au_add_nlink(struct inode *dir, struct inode *h_dir);
-+void au_sub_nlink(struct inode *dir, struct inode *h_dir);
-+loff_t au_dir_size(struct file *file, struct dentry *dentry);
-+void au_dir_ts(struct inode *dir, aufs_bindex_t bsrc);
-+int au_test_empty_lower(struct dentry *dentry);
-+int au_test_empty(struct dentry *dentry, struct au_nhash *whlist);
-+
-+/* vdir.c */
-+unsigned int au_rdhash_est(loff_t sz);
-+int au_nhash_alloc(struct au_nhash *nhash, unsigned int num_hash, gfp_t gfp);
-+void au_nhash_wh_free(struct au_nhash *whlist);
-+int au_nhash_test_longer_wh(struct au_nhash *whlist, aufs_bindex_t btgt,
-+			    int limit);
-+int au_nhash_test_known_wh(struct au_nhash *whlist, char *name, int nlen);
-+int au_nhash_append_wh(struct au_nhash *whlist, char *name, int nlen, ino_t ino,
-+		       unsigned int d_type, aufs_bindex_t bindex,
-+		       unsigned char shwh);
-+void au_vdir_free(struct au_vdir *vdir);
-+int au_vdir_init(struct file *file);
-+int au_vdir_fill_de(struct file *file, struct dir_context *ctx);
-+
-+/* ioctl.c */
-+long aufs_ioctl_dir(struct file *file, unsigned int cmd, unsigned long arg);
-+
-+#ifdef CONFIG_AUFS_RDU
-+/* rdu.c */
-+long au_rdu_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
-+#ifdef CONFIG_COMPAT
-+long au_rdu_compat_ioctl(struct file *file, unsigned int cmd,
-+			 unsigned long arg);
-+#endif
-+#else
-+AuStub(long, au_rdu_ioctl, return -EINVAL, struct file *file,
-+       unsigned int cmd, unsigned long arg)
-+#ifdef CONFIG_COMPAT
-+AuStub(long, au_rdu_compat_ioctl, return -EINVAL, struct file *file,
-+       unsigned int cmd, unsigned long arg)
-+#endif
-+#endif
-+
-+#endif /* __KERNEL__ */
-+#endif /* __AUFS_DIR_H__ */
-diff -Nur linux-4.1.10.orig/fs/aufs/dynop.c linux-4.1.10/fs/aufs/dynop.c
---- linux-4.1.10.orig/fs/aufs/dynop.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/dynop.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,369 @@
-+/*
-+ * Copyright (C) 2010-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * dynamically customizable operations for regular files
-+ */
-+
-+#include "aufs.h"
-+
-+#define DyPrSym(key)	AuDbgSym(key->dk_op.dy_hop)
-+
-+/*
-+ * How large will these lists be?
-+ * Usually just a few elements, 20-30 at most for each, I guess.
-+ */
-+static struct au_splhead dynop[AuDyLast];
-+
-+static struct au_dykey *dy_gfind_get(struct au_splhead *spl, const void *h_op)
-+{
-+	struct au_dykey *key, *tmp;
-+	struct list_head *head;
-+
-+	key = NULL;
-+	head = &spl->head;
-+	rcu_read_lock();
-+	list_for_each_entry_rcu(tmp, head, dk_list)
-+		if (tmp->dk_op.dy_hop == h_op) {
-+			key = tmp;
-+			kref_get(&key->dk_kref);
-+			break;
-+		}
-+	rcu_read_unlock();
-+
-+	return key;
-+}
-+
-+static struct au_dykey *dy_bradd(struct au_branch *br, struct au_dykey *key)
-+{
-+	struct au_dykey **k, *found;
-+	const void *h_op = key->dk_op.dy_hop;
-+	int i;
-+
-+	found = NULL;
-+	k = br->br_dykey;
-+	for (i = 0; i < AuBrDynOp; i++)
-+		if (k[i]) {
-+			if (k[i]->dk_op.dy_hop == h_op) {
-+				found = k[i];
-+				break;
-+			}
-+		} else
-+			break;
-+	if (!found) {
-+		spin_lock(&br->br_dykey_lock);
-+		for (; i < AuBrDynOp; i++)
-+			if (k[i]) {
-+				if (k[i]->dk_op.dy_hop == h_op) {
-+					found = k[i];
-+					break;
-+				}
-+			} else {
-+				k[i] = key;
-+				break;
-+			}
-+		spin_unlock(&br->br_dykey_lock);
-+		BUG_ON(i == AuBrDynOp); /* expand the array */
-+	}
-+
-+	return found;
-+}
-+
-+/* kref_get() if @key is already added */
-+static struct au_dykey *dy_gadd(struct au_splhead *spl, struct au_dykey *key)
-+{
-+	struct au_dykey *tmp, *found;
-+	struct list_head *head;
-+	const void *h_op = key->dk_op.dy_hop;
-+
-+	found = NULL;
-+	head = &spl->head;
-+	spin_lock(&spl->spin);
-+	list_for_each_entry(tmp, head, dk_list)
-+		if (tmp->dk_op.dy_hop == h_op) {
-+			kref_get(&tmp->dk_kref);
-+			found = tmp;
-+			break;
-+		}
-+	if (!found)
-+		list_add_rcu(&key->dk_list, head);
-+	spin_unlock(&spl->spin);
-+
-+	if (!found)
-+		DyPrSym(key);
-+	return found;
-+}
-+
-+static void dy_free_rcu(struct rcu_head *rcu)
-+{
-+	struct au_dykey *key;
-+
-+	key = container_of(rcu, struct au_dykey, dk_rcu);
-+	DyPrSym(key);
-+	kfree(key);
-+}
-+
-+static void dy_free(struct kref *kref)
-+{
-+	struct au_dykey *key;
-+	struct au_splhead *spl;
-+
-+	key = container_of(kref, struct au_dykey, dk_kref);
-+	spl = dynop + key->dk_op.dy_type;
-+	au_spl_del_rcu(&key->dk_list, spl);
-+	call_rcu(&key->dk_rcu, dy_free_rcu);
-+}
-+
-+void au_dy_put(struct au_dykey *key)
-+{
-+	kref_put(&key->dk_kref, dy_free);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+#define DyDbgSize(cnt, op)	AuDebugOn(cnt != sizeof(op)/sizeof(void *))
-+
-+#ifdef CONFIG_AUFS_DEBUG
-+#define DyDbgDeclare(cnt)	unsigned int cnt = 0
-+#define DyDbgInc(cnt)		do { cnt++; } while (0)
-+#else
-+#define DyDbgDeclare(cnt)	do {} while (0)
-+#define DyDbgInc(cnt)		do {} while (0)
-+#endif
-+
-+#define DySet(func, dst, src, h_op, h_sb) do {				\
-+	DyDbgInc(cnt);							\
-+	if (h_op->func) {						\
-+		if (src.func)						\
-+			dst.func = src.func;				\
-+		else							\
-+			AuDbg("%s %s\n", au_sbtype(h_sb), #func);	\
-+	}								\
-+} while (0)
-+
-+#define DySetForce(func, dst, src) do {		\
-+	AuDebugOn(!src.func);			\
-+	DyDbgInc(cnt);				\
-+	dst.func = src.func;			\
-+} while (0)
-+
-+#define DySetAop(func) \
-+	DySet(func, dyaop->da_op, aufs_aop, h_aop, h_sb)
-+#define DySetAopForce(func) \
-+	DySetForce(func, dyaop->da_op, aufs_aop)
-+
-+static void dy_aop(struct au_dykey *key, const void *h_op,
-+		   struct super_block *h_sb __maybe_unused)
-+{
-+	struct au_dyaop *dyaop = (void *)key;
-+	const struct address_space_operations *h_aop = h_op;
-+	DyDbgDeclare(cnt);
-+
-+	AuDbg("%s\n", au_sbtype(h_sb));
-+
-+	DySetAop(writepage);
-+	DySetAopForce(readpage);	/* force */
-+	DySetAop(writepages);
-+	DySetAop(set_page_dirty);
-+	DySetAop(readpages);
-+	DySetAop(write_begin);
-+	DySetAop(write_end);
-+	DySetAop(bmap);
-+	DySetAop(invalidatepage);
-+	DySetAop(releasepage);
-+	DySetAop(freepage);
-+	/* this one will be changed according to an aufs mount option */
-+	DySetAop(direct_IO);
-+	DySetAop(migratepage);
-+	DySetAop(launder_page);
-+	DySetAop(is_partially_uptodate);
-+	DySetAop(is_dirty_writeback);
-+	DySetAop(error_remove_page);
-+	DySetAop(swap_activate);
-+	DySetAop(swap_deactivate);
-+
-+	DyDbgSize(cnt, *h_aop);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static void dy_bug(struct kref *kref)
-+{
-+	BUG();
-+}
-+
-+static struct au_dykey *dy_get(struct au_dynop *op, struct au_branch *br)
-+{
-+	struct au_dykey *key, *old;
-+	struct au_splhead *spl;
-+	struct op {
-+		unsigned int sz;
-+		void (*set)(struct au_dykey *key, const void *h_op,
-+			    struct super_block *h_sb __maybe_unused);
-+	};
-+	static const struct op a[] = {
-+		[AuDy_AOP] = {
-+			.sz	= sizeof(struct au_dyaop),
-+			.set	= dy_aop
-+		}
-+	};
-+	const struct op *p;
-+
-+	spl = dynop + op->dy_type;
-+	key = dy_gfind_get(spl, op->dy_hop);
-+	if (key)
-+		goto out_add; /* success */
-+
-+	p = a + op->dy_type;
-+	key = kzalloc(p->sz, GFP_NOFS);
-+	if (unlikely(!key)) {
-+		key = ERR_PTR(-ENOMEM);
-+		goto out;
-+	}
-+
-+	key->dk_op.dy_hop = op->dy_hop;
-+	kref_init(&key->dk_kref);
-+	p->set(key, op->dy_hop, au_br_sb(br));
-+	old = dy_gadd(spl, key);
-+	if (old) {
-+		kfree(key);
-+		key = old;
-+	}
-+
-+out_add:
-+	old = dy_bradd(br, key);
-+	if (old)
-+		/* its ref-count should never be zero here */
-+		kref_put(&key->dk_kref, dy_bug);
-+out:
-+	return key;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+/*
-+ * Aufs prohibits O_DIRECT by defaut even if the branch supports it.
-+ * This behaviour is necessary to return an error from open(O_DIRECT) instead
-+ * of the succeeding I/O. The dio mount option enables O_DIRECT and makes
-+ * open(O_DIRECT) always succeed, but the succeeding I/O may return an error.
-+ * See the aufs manual in detail.
-+ */
-+static void dy_adx(struct au_dyaop *dyaop, int do_dx)
-+{
-+	if (!do_dx)
-+		dyaop->da_op.direct_IO = NULL;
-+	else
-+		dyaop->da_op.direct_IO = aufs_aop.direct_IO;
-+}
-+
-+static struct au_dyaop *dy_aget(struct au_branch *br,
-+				const struct address_space_operations *h_aop,
-+				int do_dx)
-+{
-+	struct au_dyaop *dyaop;
-+	struct au_dynop op;
-+
-+	op.dy_type = AuDy_AOP;
-+	op.dy_haop = h_aop;
-+	dyaop = (void *)dy_get(&op, br);
-+	if (IS_ERR(dyaop))
-+		goto out;
-+	dy_adx(dyaop, do_dx);
-+
-+out:
-+	return dyaop;
-+}
-+
-+int au_dy_iaop(struct inode *inode, aufs_bindex_t bindex,
-+		struct inode *h_inode)
-+{
-+	int err, do_dx;
-+	struct super_block *sb;
-+	struct au_branch *br;
-+	struct au_dyaop *dyaop;
-+
-+	AuDebugOn(!S_ISREG(h_inode->i_mode));
-+	IiMustWriteLock(inode);
-+
-+	sb = inode->i_sb;
-+	br = au_sbr(sb, bindex);
-+	do_dx = !!au_opt_test(au_mntflags(sb), DIO);
-+	dyaop = dy_aget(br, h_inode->i_mapping->a_ops, do_dx);
-+	err = PTR_ERR(dyaop);
-+	if (IS_ERR(dyaop))
-+		/* unnecessary to call dy_fput() */
-+		goto out;
-+
-+	err = 0;
-+	inode->i_mapping->a_ops = &dyaop->da_op;
-+
-+out:
-+	return err;
-+}
-+
-+/*
-+ * Is it safe to replace a_ops during the inode/file is in operation?
-+ * Yes, I hope so.
-+ */
-+int au_dy_irefresh(struct inode *inode)
-+{
-+	int err;
-+	aufs_bindex_t bstart;
-+	struct inode *h_inode;
-+
-+	err = 0;
-+	if (S_ISREG(inode->i_mode)) {
-+		bstart = au_ibstart(inode);
-+		h_inode = au_h_iptr(inode, bstart);
-+		err = au_dy_iaop(inode, bstart, h_inode);
-+	}
-+	return err;
-+}
-+
-+void au_dy_arefresh(int do_dx)
-+{
-+	struct au_splhead *spl;
-+	struct list_head *head;
-+	struct au_dykey *key;
-+
-+	spl = dynop + AuDy_AOP;
-+	head = &spl->head;
-+	spin_lock(&spl->spin);
-+	list_for_each_entry(key, head, dk_list)
-+		dy_adx((void *)key, do_dx);
-+	spin_unlock(&spl->spin);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+void __init au_dy_init(void)
-+{
-+	int i;
-+
-+	/* make sure that 'struct au_dykey *' can be any type */
-+	BUILD_BUG_ON(offsetof(struct au_dyaop, da_key));
-+
-+	for (i = 0; i < AuDyLast; i++)
-+		au_spl_init(dynop + i);
-+}
-+
-+void au_dy_fin(void)
-+{
-+	int i;
-+
-+	for (i = 0; i < AuDyLast; i++)
-+		WARN_ON(!list_empty(&dynop[i].head));
-+}
-diff -Nur linux-4.1.10.orig/fs/aufs/dynop.h linux-4.1.10/fs/aufs/dynop.h
---- linux-4.1.10.orig/fs/aufs/dynop.h	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/dynop.h	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,74 @@
-+/*
-+ * Copyright (C) 2010-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * dynamically customizable operations (for regular files only)
-+ */
-+
-+#ifndef __AUFS_DYNOP_H__
-+#define __AUFS_DYNOP_H__
-+
-+#ifdef __KERNEL__
-+
-+#include <linux/fs.h>
-+#include <linux/kref.h>
-+
-+enum {AuDy_AOP, AuDyLast};
-+
-+struct au_dynop {
-+	int						dy_type;
-+	union {
-+		const void				*dy_hop;
-+		const struct address_space_operations	*dy_haop;
-+	};
-+};
-+
-+struct au_dykey {
-+	union {
-+		struct list_head	dk_list;
-+		struct rcu_head		dk_rcu;
-+	};
-+	struct au_dynop		dk_op;
-+
-+	/*
-+	 * during I am in the branch local array, kref is gotten. when the
-+	 * branch is removed, kref is put.
-+	 */
-+	struct kref		dk_kref;
-+};
-+
-+/* stop unioning since their sizes are very different from each other */
-+struct au_dyaop {
-+	struct au_dykey			da_key;
-+	struct address_space_operations	da_op; /* not const */
-+};
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* dynop.c */
-+struct au_branch;
-+void au_dy_put(struct au_dykey *key);
-+int au_dy_iaop(struct inode *inode, aufs_bindex_t bindex,
-+		struct inode *h_inode);
-+int au_dy_irefresh(struct inode *inode);
-+void au_dy_arefresh(int do_dio);
-+
-+void __init au_dy_init(void);
-+void au_dy_fin(void);
-+
-+#endif /* __KERNEL__ */
-+#endif /* __AUFS_DYNOP_H__ */
-diff -Nur linux-4.1.10.orig/fs/aufs/export.c linux-4.1.10/fs/aufs/export.c
---- linux-4.1.10.orig/fs/aufs/export.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/export.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,832 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * export via nfs
-+ */
-+
-+#include <linux/exportfs.h>
-+#include <linux/fs_struct.h>
-+#include <linux/namei.h>
-+#include <linux/nsproxy.h>
-+#include <linux/random.h>
-+#include <linux/writeback.h>
-+#include "../fs/mount.h"
-+#include "aufs.h"
-+
-+union conv {
-+#ifdef CONFIG_AUFS_INO_T_64
-+	__u32 a[2];
-+#else
-+	__u32 a[1];
-+#endif
-+	ino_t ino;
-+};
-+
-+static ino_t decode_ino(__u32 *a)
-+{
-+	union conv u;
-+
-+	BUILD_BUG_ON(sizeof(u.ino) != sizeof(u.a));
-+	u.a[0] = a[0];
-+#ifdef CONFIG_AUFS_INO_T_64
-+	u.a[1] = a[1];
-+#endif
-+	return u.ino;
-+}
-+
-+static void encode_ino(__u32 *a, ino_t ino)
-+{
-+	union conv u;
-+
-+	u.ino = ino;
-+	a[0] = u.a[0];
-+#ifdef CONFIG_AUFS_INO_T_64
-+	a[1] = u.a[1];
-+#endif
-+}
-+
-+/* NFS file handle */
-+enum {
-+	Fh_br_id,
-+	Fh_sigen,
-+#ifdef CONFIG_AUFS_INO_T_64
-+	/* support 64bit inode number */
-+	Fh_ino1,
-+	Fh_ino2,
-+	Fh_dir_ino1,
-+	Fh_dir_ino2,
-+#else
-+	Fh_ino1,
-+	Fh_dir_ino1,
-+#endif
-+	Fh_igen,
-+	Fh_h_type,
-+	Fh_tail,
-+
-+	Fh_ino = Fh_ino1,
-+	Fh_dir_ino = Fh_dir_ino1
-+};
-+
-+static int au_test_anon(struct dentry *dentry)
-+{
-+	/* note: read d_flags without d_lock */
-+	return !!(dentry->d_flags & DCACHE_DISCONNECTED);
-+}
-+
-+int au_test_nfsd(void)
-+{
-+	int ret;
-+	struct task_struct *tsk = current;
-+	char comm[sizeof(tsk->comm)];
-+
-+	ret = 0;
-+	if (tsk->flags & PF_KTHREAD) {
-+		get_task_comm(comm, tsk);
-+		ret = !strcmp(comm, "nfsd");
-+	}
-+
-+	return ret;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+/* inode generation external table */
-+
-+void au_xigen_inc(struct inode *inode)
-+{
-+	loff_t pos;
-+	ssize_t sz;
-+	__u32 igen;
-+	struct super_block *sb;
-+	struct au_sbinfo *sbinfo;
-+
-+	sb = inode->i_sb;
-+	AuDebugOn(!au_opt_test(au_mntflags(sb), XINO));
-+
-+	sbinfo = au_sbi(sb);
-+	pos = inode->i_ino;
-+	pos *= sizeof(igen);
-+	igen = inode->i_generation + 1;
-+	sz = xino_fwrite(sbinfo->si_xwrite, sbinfo->si_xigen, &igen,
-+			 sizeof(igen), &pos);
-+	if (sz == sizeof(igen))
-+		return; /* success */
-+
-+	if (unlikely(sz >= 0))
-+		AuIOErr("xigen error (%zd)\n", sz);
-+}
-+
-+int au_xigen_new(struct inode *inode)
-+{
-+	int err;
-+	loff_t pos;
-+	ssize_t sz;
-+	struct super_block *sb;
-+	struct au_sbinfo *sbinfo;
-+	struct file *file;
-+
-+	err = 0;
-+	/* todo: dirty, at mount time */
-+	if (inode->i_ino == AUFS_ROOT_INO)
-+		goto out;
-+	sb = inode->i_sb;
-+	SiMustAnyLock(sb);
-+	if (unlikely(!au_opt_test(au_mntflags(sb), XINO)))
-+		goto out;
-+
-+	err = -EFBIG;
-+	pos = inode->i_ino;
-+	if (unlikely(au_loff_max / sizeof(inode->i_generation) - 1 < pos)) {
-+		AuIOErr1("too large i%lld\n", pos);
-+		goto out;
-+	}
-+	pos *= sizeof(inode->i_generation);
-+
-+	err = 0;
-+	sbinfo = au_sbi(sb);
-+	file = sbinfo->si_xigen;
-+	BUG_ON(!file);
-+
-+	if (vfsub_f_size_read(file)
-+	    < pos + sizeof(inode->i_generation)) {
-+		inode->i_generation = atomic_inc_return(&sbinfo->si_xigen_next);
-+		sz = xino_fwrite(sbinfo->si_xwrite, file, &inode->i_generation,
-+				 sizeof(inode->i_generation), &pos);
-+	} else
-+		sz = xino_fread(sbinfo->si_xread, file, &inode->i_generation,
-+				sizeof(inode->i_generation), &pos);
-+	if (sz == sizeof(inode->i_generation))
-+		goto out; /* success */
-+
-+	err = sz;
-+	if (unlikely(sz >= 0)) {
-+		err = -EIO;
-+		AuIOErr("xigen error (%zd)\n", sz);
-+	}
-+
-+out:
-+	return err;
-+}
-+
-+int au_xigen_set(struct super_block *sb, struct file *base)
-+{
-+	int err;
-+	struct au_sbinfo *sbinfo;
-+	struct file *file;
-+
-+	SiMustWriteLock(sb);
-+
-+	sbinfo = au_sbi(sb);
-+	file = au_xino_create2(base, sbinfo->si_xigen);
-+	err = PTR_ERR(file);
-+	if (IS_ERR(file))
-+		goto out;
-+	err = 0;
-+	if (sbinfo->si_xigen)
-+		fput(sbinfo->si_xigen);
-+	sbinfo->si_xigen = file;
-+
-+out:
-+	return err;
-+}
-+
-+void au_xigen_clr(struct super_block *sb)
-+{
-+	struct au_sbinfo *sbinfo;
-+
-+	SiMustWriteLock(sb);
-+
-+	sbinfo = au_sbi(sb);
-+	if (sbinfo->si_xigen) {
-+		fput(sbinfo->si_xigen);
-+		sbinfo->si_xigen = NULL;
-+	}
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static struct dentry *decode_by_ino(struct super_block *sb, ino_t ino,
-+				    ino_t dir_ino)
-+{
-+	struct dentry *dentry, *d;
-+	struct inode *inode;
-+	unsigned int sigen;
-+
-+	dentry = NULL;
-+	inode = ilookup(sb, ino);
-+	if (!inode)
-+		goto out;
-+
-+	dentry = ERR_PTR(-ESTALE);
-+	sigen = au_sigen(sb);
-+	if (unlikely(is_bad_inode(inode)
-+		     || IS_DEADDIR(inode)
-+		     || sigen != au_iigen(inode, NULL)))
-+		goto out_iput;
-+
-+	dentry = NULL;
-+	if (!dir_ino || S_ISDIR(inode->i_mode))
-+		dentry = d_find_alias(inode);
-+	else {
-+		spin_lock(&inode->i_lock);
-+		hlist_for_each_entry(d, &inode->i_dentry, d_u.d_alias) {
-+			spin_lock(&d->d_lock);
-+			if (!au_test_anon(d)
-+			    && d_inode(d->d_parent)->i_ino == dir_ino) {
-+				dentry = dget_dlock(d);
-+				spin_unlock(&d->d_lock);
-+				break;
-+			}
-+			spin_unlock(&d->d_lock);
-+		}
-+		spin_unlock(&inode->i_lock);
-+	}
-+	if (unlikely(dentry && au_digen_test(dentry, sigen))) {
-+		/* need to refresh */
-+		dput(dentry);
-+		dentry = NULL;
-+	}
-+
-+out_iput:
-+	iput(inode);
-+out:
-+	AuTraceErrPtr(dentry);
-+	return dentry;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* todo: dirty? */
-+/* if exportfs_decode_fh() passed vfsmount*, we could be happy */
-+
-+struct au_compare_mnt_args {
-+	/* input */
-+	struct super_block *sb;
-+
-+	/* output */
-+	struct vfsmount *mnt;
-+};
-+
-+static int au_compare_mnt(struct vfsmount *mnt, void *arg)
-+{
-+	struct au_compare_mnt_args *a = arg;
-+
-+	if (mnt->mnt_sb != a->sb)
-+		return 0;
-+	a->mnt = mntget(mnt);
-+	return 1;
-+}
-+
-+static struct vfsmount *au_mnt_get(struct super_block *sb)
-+{
-+	int err;
-+	struct path root;
-+	struct au_compare_mnt_args args = {
-+		.sb = sb
-+	};
-+
-+	get_fs_root(current->fs, &root);
-+	rcu_read_lock();
-+	err = iterate_mounts(au_compare_mnt, &args, root.mnt);
-+	rcu_read_unlock();
-+	path_put(&root);
-+	AuDebugOn(!err);
-+	AuDebugOn(!args.mnt);
-+	return args.mnt;
-+}
-+
-+struct au_nfsd_si_lock {
-+	unsigned int sigen;
-+	aufs_bindex_t bindex, br_id;
-+	unsigned char force_lock;
-+};
-+
-+static int si_nfsd_read_lock(struct super_block *sb,
-+			     struct au_nfsd_si_lock *nsi_lock)
-+{
-+	int err;
-+	aufs_bindex_t bindex;
-+
-+	si_read_lock(sb, AuLock_FLUSH);
-+
-+	/* branch id may be wrapped around */
-+	err = 0;
-+	bindex = au_br_index(sb, nsi_lock->br_id);
-+	if (bindex >= 0 && nsi_lock->sigen + AUFS_BRANCH_MAX > au_sigen(sb))
-+		goto out; /* success */
-+
-+	err = -ESTALE;
-+	bindex = -1;
-+	if (!nsi_lock->force_lock)
-+		si_read_unlock(sb);
-+
-+out:
-+	nsi_lock->bindex = bindex;
-+	return err;
-+}
-+
-+struct find_name_by_ino {
-+	struct dir_context ctx;
-+	int called, found;
-+	ino_t ino;
-+	char *name;
-+	int namelen;
-+};
-+
-+static int
-+find_name_by_ino(struct dir_context *ctx, const char *name, int namelen,
-+		 loff_t offset, u64 ino, unsigned int d_type)
-+{
-+	struct find_name_by_ino *a = container_of(ctx, struct find_name_by_ino,
-+						  ctx);
-+
-+	a->called++;
-+	if (a->ino != ino)
-+		return 0;
-+
-+	memcpy(a->name, name, namelen);
-+	a->namelen = namelen;
-+	a->found = 1;
-+	return 1;
-+}
-+
-+static struct dentry *au_lkup_by_ino(struct path *path, ino_t ino,
-+				     struct au_nfsd_si_lock *nsi_lock)
-+{
-+	struct dentry *dentry, *parent;
-+	struct file *file;
-+	struct inode *dir;
-+	struct find_name_by_ino arg = {
-+		.ctx = {
-+			.actor = find_name_by_ino
-+		}
-+	};
-+	int err;
-+
-+	parent = path->dentry;
-+	if (nsi_lock)
-+		si_read_unlock(parent->d_sb);
-+	file = vfsub_dentry_open(path, au_dir_roflags);
-+	dentry = (void *)file;
-+	if (IS_ERR(file))
-+		goto out;
-+
-+	dentry = ERR_PTR(-ENOMEM);
-+	arg.name = (void *)__get_free_page(GFP_NOFS);
-+	if (unlikely(!arg.name))
-+		goto out_file;
-+	arg.ino = ino;
-+	arg.found = 0;
-+	do {
-+		arg.called = 0;
-+		/* smp_mb(); */
-+		err = vfsub_iterate_dir(file, &arg.ctx);
-+	} while (!err && !arg.found && arg.called);
-+	dentry = ERR_PTR(err);
-+	if (unlikely(err))
-+		goto out_name;
-+	/* instead of ENOENT */
-+	dentry = ERR_PTR(-ESTALE);
-+	if (!arg.found)
-+		goto out_name;
-+
-+	/* do not call vfsub_lkup_one() */
-+	dir = d_inode(parent);
-+	mutex_lock(&dir->i_mutex);
-+	dentry = vfsub_lookup_one_len(arg.name, parent, arg.namelen);
-+	mutex_unlock(&dir->i_mutex);
-+	AuTraceErrPtr(dentry);
-+	if (IS_ERR(dentry))
-+		goto out_name;
-+	AuDebugOn(au_test_anon(dentry));
-+	if (unlikely(d_really_is_negative(dentry))) {
-+		dput(dentry);
-+		dentry = ERR_PTR(-ENOENT);
-+	}
-+
-+out_name:
-+	free_page((unsigned long)arg.name);
-+out_file:
-+	fput(file);
-+out:
-+	if (unlikely(nsi_lock
-+		     && si_nfsd_read_lock(parent->d_sb, nsi_lock) < 0))
-+		if (!IS_ERR(dentry)) {
-+			dput(dentry);
-+			dentry = ERR_PTR(-ESTALE);
-+		}
-+	AuTraceErrPtr(dentry);
-+	return dentry;
-+}
-+
-+static struct dentry *decode_by_dir_ino(struct super_block *sb, ino_t ino,
-+					ino_t dir_ino,
-+					struct au_nfsd_si_lock *nsi_lock)
-+{
-+	struct dentry *dentry;
-+	struct path path;
-+
-+	if (dir_ino != AUFS_ROOT_INO) {
-+		path.dentry = decode_by_ino(sb, dir_ino, 0);
-+		dentry = path.dentry;
-+		if (!path.dentry || IS_ERR(path.dentry))
-+			goto out;
-+		AuDebugOn(au_test_anon(path.dentry));
-+	} else
-+		path.dentry = dget(sb->s_root);
-+
-+	path.mnt = au_mnt_get(sb);
-+	dentry = au_lkup_by_ino(&path, ino, nsi_lock);
-+	path_put(&path);
-+
-+out:
-+	AuTraceErrPtr(dentry);
-+	return dentry;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static int h_acceptable(void *expv, struct dentry *dentry)
-+{
-+	return 1;
-+}
-+
-+static char *au_build_path(struct dentry *h_parent, struct path *h_rootpath,
-+			   char *buf, int len, struct super_block *sb)
-+{
-+	char *p;
-+	int n;
-+	struct path path;
-+
-+	p = d_path(h_rootpath, buf, len);
-+	if (IS_ERR(p))
-+		goto out;
-+	n = strlen(p);
-+
-+	path.mnt = h_rootpath->mnt;
-+	path.dentry = h_parent;
-+	p = d_path(&path, buf, len);
-+	if (IS_ERR(p))
-+		goto out;
-+	if (n != 1)
-+		p += n;
-+
-+	path.mnt = au_mnt_get(sb);
-+	path.dentry = sb->s_root;
-+	p = d_path(&path, buf, len - strlen(p));
-+	mntput(path.mnt);
-+	if (IS_ERR(p))
-+		goto out;
-+	if (n != 1)
-+		p[strlen(p)] = '/';
-+
-+out:
-+	AuTraceErrPtr(p);
-+	return p;
-+}
-+
-+static
-+struct dentry *decode_by_path(struct super_block *sb, ino_t ino, __u32 *fh,
-+			      int fh_len, struct au_nfsd_si_lock *nsi_lock)
-+{
-+	struct dentry *dentry, *h_parent, *root;
-+	struct super_block *h_sb;
-+	char *pathname, *p;
-+	struct vfsmount *h_mnt;
-+	struct au_branch *br;
-+	int err;
-+	struct path path;
-+
-+	br = au_sbr(sb, nsi_lock->bindex);
-+	h_mnt = au_br_mnt(br);
-+	h_sb = h_mnt->mnt_sb;
-+	/* todo: call lower fh_to_dentry()? fh_to_parent()? */
-+	h_parent = exportfs_decode_fh(h_mnt, (void *)(fh + Fh_tail),
-+				      fh_len - Fh_tail, fh[Fh_h_type],
-+				      h_acceptable, /*context*/NULL);
-+	dentry = h_parent;
-+	if (unlikely(!h_parent || IS_ERR(h_parent))) {
-+		AuWarn1("%s decode_fh failed, %ld\n",
-+			au_sbtype(h_sb), PTR_ERR(h_parent));
-+		goto out;
-+	}
-+	dentry = NULL;
-+	if (unlikely(au_test_anon(h_parent))) {
-+		AuWarn1("%s decode_fh returned a disconnected dentry\n",
-+			au_sbtype(h_sb));
-+		goto out_h_parent;
-+	}
-+
-+	dentry = ERR_PTR(-ENOMEM);
-+	pathname = (void *)__get_free_page(GFP_NOFS);
-+	if (unlikely(!pathname))
-+		goto out_h_parent;
-+
-+	root = sb->s_root;
-+	path.mnt = h_mnt;
-+	di_read_lock_parent(root, !AuLock_IR);
-+	path.dentry = au_h_dptr(root, nsi_lock->bindex);
-+	di_read_unlock(root, !AuLock_IR);
-+	p = au_build_path(h_parent, &path, pathname, PAGE_SIZE, sb);
-+	dentry = (void *)p;
-+	if (IS_ERR(p))
-+		goto out_pathname;
-+
-+	si_read_unlock(sb);
-+	err = vfsub_kern_path(p, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path);
-+	dentry = ERR_PTR(err);
-+	if (unlikely(err))
-+		goto out_relock;
-+
-+	dentry = ERR_PTR(-ENOENT);
-+	AuDebugOn(au_test_anon(path.dentry));
-+	if (unlikely(d_really_is_negative(path.dentry)))
-+		goto out_path;
-+
-+	if (ino != d_inode(path.dentry)->i_ino)
-+		dentry = au_lkup_by_ino(&path, ino, /*nsi_lock*/NULL);
-+	else
-+		dentry = dget(path.dentry);
-+
-+out_path:
-+	path_put(&path);
-+out_relock:
-+	if (unlikely(si_nfsd_read_lock(sb, nsi_lock) < 0))
-+		if (!IS_ERR(dentry)) {
-+			dput(dentry);
-+			dentry = ERR_PTR(-ESTALE);
-+		}
-+out_pathname:
-+	free_page((unsigned long)pathname);
-+out_h_parent:
-+	dput(h_parent);
-+out:
-+	AuTraceErrPtr(dentry);
-+	return dentry;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static struct dentry *
-+aufs_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len,
-+		  int fh_type)
-+{
-+	struct dentry *dentry;
-+	__u32 *fh = fid->raw;
-+	struct au_branch *br;
-+	ino_t ino, dir_ino;
-+	struct au_nfsd_si_lock nsi_lock = {
-+		.force_lock	= 0
-+	};
-+
-+	dentry = ERR_PTR(-ESTALE);
-+	/* it should never happen, but the file handle is unreliable */
-+	if (unlikely(fh_len < Fh_tail))
-+		goto out;
-+	nsi_lock.sigen = fh[Fh_sigen];
-+	nsi_lock.br_id = fh[Fh_br_id];
-+
-+	/* branch id may be wrapped around */
-+	br = NULL;
-+	if (unlikely(si_nfsd_read_lock(sb, &nsi_lock)))
-+		goto out;
-+	nsi_lock.force_lock = 1;
-+
-+	/* is this inode still cached? */
-+	ino = decode_ino(fh + Fh_ino);
-+	/* it should never happen */
-+	if (unlikely(ino == AUFS_ROOT_INO))
-+		goto out;
-+
-+	dir_ino = decode_ino(fh + Fh_dir_ino);
-+	dentry = decode_by_ino(sb, ino, dir_ino);
-+	if (IS_ERR(dentry))
-+		goto out_unlock;
-+	if (dentry)
-+		goto accept;
-+
-+	/* is the parent dir cached? */
-+	br = au_sbr(sb, nsi_lock.bindex);
-+	atomic_inc(&br->br_count);
-+	dentry = decode_by_dir_ino(sb, ino, dir_ino, &nsi_lock);
-+	if (IS_ERR(dentry))
-+		goto out_unlock;
-+	if (dentry)
-+		goto accept;
-+
-+	/* lookup path */
-+	dentry = decode_by_path(sb, ino, fh, fh_len, &nsi_lock);
-+	if (IS_ERR(dentry))
-+		goto out_unlock;
-+	if (unlikely(!dentry))
-+		/* todo?: make it ESTALE */
-+		goto out_unlock;
-+
-+accept:
-+	if (!au_digen_test(dentry, au_sigen(sb))
-+	    && d_inode(dentry)->i_generation == fh[Fh_igen])
-+		goto out_unlock; /* success */
-+
-+	dput(dentry);
-+	dentry = ERR_PTR(-ESTALE);
-+out_unlock:
-+	if (br)
-+		atomic_dec(&br->br_count);
-+	si_read_unlock(sb);
-+out:
-+	AuTraceErrPtr(dentry);
-+	return dentry;
-+}
-+
-+#if 0 /* reserved for future use */
-+/* support subtreecheck option */
-+static struct dentry *aufs_fh_to_parent(struct super_block *sb, struct fid *fid,
-+					int fh_len, int fh_type)
-+{
-+	struct dentry *parent;
-+	__u32 *fh = fid->raw;
-+	ino_t dir_ino;
-+
-+	dir_ino = decode_ino(fh + Fh_dir_ino);
-+	parent = decode_by_ino(sb, dir_ino, 0);
-+	if (IS_ERR(parent))
-+		goto out;
-+	if (!parent)
-+		parent = decode_by_path(sb, au_br_index(sb, fh[Fh_br_id]),
-+					dir_ino, fh, fh_len);
-+
-+out:
-+	AuTraceErrPtr(parent);
-+	return parent;
-+}
-+#endif
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static int aufs_encode_fh(struct inode *inode, __u32 *fh, int *max_len,
-+			  struct inode *dir)
-+{
-+	int err;
-+	aufs_bindex_t bindex;
-+	struct super_block *sb, *h_sb;
-+	struct dentry *dentry, *parent, *h_parent;
-+	struct inode *h_dir;
-+	struct au_branch *br;
-+
-+	err = -ENOSPC;
-+	if (unlikely(*max_len <= Fh_tail)) {
-+		AuWarn1("NFSv2 client (max_len %d)?\n", *max_len);
-+		goto out;
-+	}
-+
-+	err = FILEID_ROOT;
-+	if (inode->i_ino == AUFS_ROOT_INO) {
-+		AuDebugOn(inode->i_ino != AUFS_ROOT_INO);
-+		goto out;
-+	}
-+
-+	h_parent = NULL;
-+	sb = inode->i_sb;
-+	err = si_read_lock(sb, AuLock_FLUSH);
-+	if (unlikely(err))
-+		goto out;
-+
-+#ifdef CONFIG_AUFS_DEBUG
-+	if (unlikely(!au_opt_test(au_mntflags(sb), XINO)))
-+		AuWarn1("NFS-exporting requires xino\n");
-+#endif
-+	err = -EIO;
-+	parent = NULL;
-+	ii_read_lock_child(inode);
-+	bindex = au_ibstart(inode);
-+	if (!dir) {
-+		dentry = d_find_any_alias(inode);
-+		if (unlikely(!dentry))
-+			goto out_unlock;
-+		AuDebugOn(au_test_anon(dentry));
-+		parent = dget_parent(dentry);
-+		dput(dentry);
-+		if (unlikely(!parent))
-+			goto out_unlock;
-+		if (d_really_is_positive(parent))
-+			dir = d_inode(parent);
-+	}
-+
-+	ii_read_lock_parent(dir);
-+	h_dir = au_h_iptr(dir, bindex);
-+	ii_read_unlock(dir);
-+	if (unlikely(!h_dir))
-+		goto out_parent;
-+	h_parent = d_find_any_alias(h_dir);
-+	if (unlikely(!h_parent))
-+		goto out_hparent;
-+
-+	err = -EPERM;
-+	br = au_sbr(sb, bindex);
-+	h_sb = au_br_sb(br);
-+	if (unlikely(!h_sb->s_export_op)) {
-+		AuErr1("%s branch is not exportable\n", au_sbtype(h_sb));
-+		goto out_hparent;
-+	}
-+
-+	fh[Fh_br_id] = br->br_id;
-+	fh[Fh_sigen] = au_sigen(sb);
-+	encode_ino(fh + Fh_ino, inode->i_ino);
-+	encode_ino(fh + Fh_dir_ino, dir->i_ino);
-+	fh[Fh_igen] = inode->i_generation;
-+
-+	*max_len -= Fh_tail;
-+	fh[Fh_h_type] = exportfs_encode_fh(h_parent, (void *)(fh + Fh_tail),
-+					   max_len,
-+					   /*connectable or subtreecheck*/0);
-+	err = fh[Fh_h_type];
-+	*max_len += Fh_tail;
-+	/* todo: macros? */
-+	if (err != FILEID_INVALID)
-+		err = 99;
-+	else
-+		AuWarn1("%s encode_fh failed\n", au_sbtype(h_sb));
-+
-+out_hparent:
-+	dput(h_parent);
-+out_parent:
-+	dput(parent);
-+out_unlock:
-+	ii_read_unlock(inode);
-+	si_read_unlock(sb);
-+out:
-+	if (unlikely(err < 0))
-+		err = FILEID_INVALID;
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static int aufs_commit_metadata(struct inode *inode)
-+{
-+	int err;
-+	aufs_bindex_t bindex;
-+	struct super_block *sb;
-+	struct inode *h_inode;
-+	int (*f)(struct inode *inode);
-+
-+	sb = inode->i_sb;
-+	si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW);
-+	ii_write_lock_child(inode);
-+	bindex = au_ibstart(inode);
-+	AuDebugOn(bindex < 0);
-+	h_inode = au_h_iptr(inode, bindex);
-+
-+	f = h_inode->i_sb->s_export_op->commit_metadata;
-+	if (f)
-+		err = f(h_inode);
-+	else {
-+		struct writeback_control wbc = {
-+			.sync_mode	= WB_SYNC_ALL,
-+			.nr_to_write	= 0 /* metadata only */
-+		};
-+
-+		err = sync_inode(h_inode, &wbc);
-+	}
-+
-+	au_cpup_attr_timesizes(inode);
-+	ii_write_unlock(inode);
-+	si_read_unlock(sb);
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static struct export_operations aufs_export_op = {
-+	.fh_to_dentry		= aufs_fh_to_dentry,
-+	/* .fh_to_parent	= aufs_fh_to_parent, */
-+	.encode_fh		= aufs_encode_fh,
-+	.commit_metadata	= aufs_commit_metadata
-+};
-+
-+void au_export_init(struct super_block *sb)
-+{
-+	struct au_sbinfo *sbinfo;
-+	__u32 u;
-+
-+	sb->s_export_op = &aufs_export_op;
-+	sbinfo = au_sbi(sb);
-+	sbinfo->si_xigen = NULL;
-+	get_random_bytes(&u, sizeof(u));
-+	BUILD_BUG_ON(sizeof(u) != sizeof(int));
-+	atomic_set(&sbinfo->si_xigen_next, u);
-+}
-diff -Nur linux-4.1.10.orig/fs/aufs/fhsm.c linux-4.1.10/fs/aufs/fhsm.c
---- linux-4.1.10.orig/fs/aufs/fhsm.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/fhsm.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,426 @@
-+/*
-+ * Copyright (C) 2011-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program; if not, write to the Free Software
-+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
-+ */
-+
-+/*
-+ * File-based Hierarchy Storage Management
-+ */
-+
-+#include <linux/anon_inodes.h>
-+#include <linux/poll.h>
-+#include <linux/seq_file.h>
-+#include <linux/statfs.h>
-+#include "aufs.h"
-+
-+static aufs_bindex_t au_fhsm_bottom(struct super_block *sb)
-+{
-+	struct au_sbinfo *sbinfo;
-+	struct au_fhsm *fhsm;
-+
-+	SiMustAnyLock(sb);
-+
-+	sbinfo = au_sbi(sb);
-+	fhsm = &sbinfo->si_fhsm;
-+	AuDebugOn(!fhsm);
-+	return fhsm->fhsm_bottom;
-+}
-+
-+void au_fhsm_set_bottom(struct super_block *sb, aufs_bindex_t bindex)
-+{
-+	struct au_sbinfo *sbinfo;
-+	struct au_fhsm *fhsm;
-+
-+	SiMustWriteLock(sb);
-+
-+	sbinfo = au_sbi(sb);
-+	fhsm = &sbinfo->si_fhsm;
-+	AuDebugOn(!fhsm);
-+	fhsm->fhsm_bottom = bindex;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static int au_fhsm_test_jiffy(struct au_sbinfo *sbinfo, struct au_branch *br)
-+{
-+	struct au_br_fhsm *bf;
-+
-+	bf = br->br_fhsm;
-+	MtxMustLock(&bf->bf_lock);
-+
-+	return !bf->bf_readable
-+		|| time_after(jiffies,
-+			      bf->bf_jiffy + sbinfo->si_fhsm.fhsm_expire);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static void au_fhsm_notify(struct super_block *sb, int val)
-+{
-+	struct au_sbinfo *sbinfo;
-+	struct au_fhsm *fhsm;
-+
-+	SiMustAnyLock(sb);
-+
-+	sbinfo = au_sbi(sb);
-+	fhsm = &sbinfo->si_fhsm;
-+	if (au_fhsm_pid(fhsm)
-+	    && atomic_read(&fhsm->fhsm_readable) != -1) {
-+		atomic_set(&fhsm->fhsm_readable, val);
-+		if (val)
-+			wake_up(&fhsm->fhsm_wqh);
-+	}
-+}
-+
-+static int au_fhsm_stfs(struct super_block *sb, aufs_bindex_t bindex,
-+			struct aufs_stfs *rstfs, int do_lock, int do_notify)
-+{
-+	int err;
-+	struct au_branch *br;
-+	struct au_br_fhsm *bf;
-+
-+	br = au_sbr(sb, bindex);
-+	AuDebugOn(au_br_rdonly(br));
-+	bf = br->br_fhsm;
-+	AuDebugOn(!bf);
-+
-+	if (do_lock)
-+		mutex_lock(&bf->bf_lock);
-+	else
-+		MtxMustLock(&bf->bf_lock);
-+
-+	/* sb->s_root for NFS is unreliable */
-+	err = au_br_stfs(br, &bf->bf_stfs);
-+	if (unlikely(err)) {
-+		AuErr1("FHSM failed (%d), b%d, ignored.\n", bindex, err);
-+		goto out;
-+	}
-+
-+	bf->bf_jiffy = jiffies;
-+	bf->bf_readable = 1;
-+	if (do_notify)
-+		au_fhsm_notify(sb, /*val*/1);
-+	if (rstfs)
-+		*rstfs = bf->bf_stfs;
-+
-+out:
-+	if (do_lock)
-+		mutex_unlock(&bf->bf_lock);
-+	au_fhsm_notify(sb, /*val*/1);
-+
-+	return err;
-+}
-+
-+void au_fhsm_wrote(struct super_block *sb, aufs_bindex_t bindex, int force)
-+{
-+	int err;
-+	struct au_sbinfo *sbinfo;
-+	struct au_fhsm *fhsm;
-+	struct au_branch *br;
-+	struct au_br_fhsm *bf;
-+
-+	AuDbg("b%d, force %d\n", bindex, force);
-+	SiMustAnyLock(sb);
-+
-+	sbinfo = au_sbi(sb);
-+	fhsm = &sbinfo->si_fhsm;
-+	if (!au_ftest_si(sbinfo, FHSM)
-+	    || fhsm->fhsm_bottom == bindex)
-+		return;
-+
-+	br = au_sbr(sb, bindex);
-+	bf = br->br_fhsm;
-+	AuDebugOn(!bf);
-+	mutex_lock(&bf->bf_lock);
-+	if (force
-+	    || au_fhsm_pid(fhsm)
-+	    || au_fhsm_test_jiffy(sbinfo, br))
-+		err = au_fhsm_stfs(sb, bindex, /*rstfs*/NULL, /*do_lock*/0,
-+				  /*do_notify*/1);
-+	mutex_unlock(&bf->bf_lock);
-+}
-+
-+void au_fhsm_wrote_all(struct super_block *sb, int force)
-+{
-+	aufs_bindex_t bindex, bend;
-+	struct au_branch *br;
-+
-+	/* exclude the bottom */
-+	bend = au_fhsm_bottom(sb);
-+	for (bindex = 0; bindex < bend; bindex++) {
-+		br = au_sbr(sb, bindex);
-+		if (au_br_fhsm(br->br_perm))
-+			au_fhsm_wrote(sb, bindex, force);
-+	}
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static unsigned int au_fhsm_poll(struct file *file,
-+				 struct poll_table_struct *wait)
-+{
-+	unsigned int mask;
-+	struct au_sbinfo *sbinfo;
-+	struct au_fhsm *fhsm;
-+
-+	mask = 0;
-+	sbinfo = file->private_data;
-+	fhsm = &sbinfo->si_fhsm;
-+	poll_wait(file, &fhsm->fhsm_wqh, wait);
-+	if (atomic_read(&fhsm->fhsm_readable))
-+		mask = POLLIN /* | POLLRDNORM */;
-+
-+	AuTraceErr((int)mask);
-+	return mask;
-+}
-+
-+static int au_fhsm_do_read_one(struct aufs_stbr __user *stbr,
-+			      struct aufs_stfs *stfs, __s16 brid)
-+{
-+	int err;
-+
-+	err = copy_to_user(&stbr->stfs, stfs, sizeof(*stfs));
-+	if (!err)
-+		err = __put_user(brid, &stbr->brid);
-+	if (unlikely(err))
-+		err = -EFAULT;
-+
-+	return err;
-+}
-+
-+static ssize_t au_fhsm_do_read(struct super_block *sb,
-+			       struct aufs_stbr __user *stbr, size_t count)
-+{
-+	ssize_t err;
-+	int nstbr;
-+	aufs_bindex_t bindex, bend;
-+	struct au_branch *br;
-+	struct au_br_fhsm *bf;
-+
-+	/* except the bottom branch */
-+	err = 0;
-+	nstbr = 0;
-+	bend = au_fhsm_bottom(sb);
-+	for (bindex = 0; !err && bindex < bend; bindex++) {
-+		br = au_sbr(sb, bindex);
-+		if (!au_br_fhsm(br->br_perm))
-+			continue;
-+
-+		bf = br->br_fhsm;
-+		mutex_lock(&bf->bf_lock);
-+		if (bf->bf_readable) {
-+			err = -EFAULT;
-+			if (count >= sizeof(*stbr))
-+				err = au_fhsm_do_read_one(stbr++, &bf->bf_stfs,
-+							  br->br_id);
-+			if (!err) {
-+				bf->bf_readable = 0;
-+				count -= sizeof(*stbr);
-+				nstbr++;
-+			}
-+		}
-+		mutex_unlock(&bf->bf_lock);
-+	}
-+	if (!err)
-+		err = sizeof(*stbr) * nstbr;
-+
-+	return err;
-+}
-+
-+static ssize_t au_fhsm_read(struct file *file, char __user *buf, size_t count,
-+			   loff_t *pos)
-+{
-+	ssize_t err;
-+	int readable;
-+	aufs_bindex_t nfhsm, bindex, bend;
-+	struct au_sbinfo *sbinfo;
-+	struct au_fhsm *fhsm;
-+	struct au_branch *br;
-+	struct super_block *sb;
-+
-+	err = 0;
-+	sbinfo = file->private_data;
-+	fhsm = &sbinfo->si_fhsm;
-+need_data:
-+	spin_lock_irq(&fhsm->fhsm_wqh.lock);
-+	if (!atomic_read(&fhsm->fhsm_readable)) {
-+		if (vfsub_file_flags(file) & O_NONBLOCK)
-+			err = -EAGAIN;
-+		else
-+			err = wait_event_interruptible_locked_irq
-+				(fhsm->fhsm_wqh,
-+				 atomic_read(&fhsm->fhsm_readable));
-+	}
-+	spin_unlock_irq(&fhsm->fhsm_wqh.lock);
-+	if (unlikely(err))
-+		goto out;
-+
-+	/* sb may already be dead */
-+	au_rw_read_lock(&sbinfo->si_rwsem);
-+	readable = atomic_read(&fhsm->fhsm_readable);
-+	if (readable > 0) {
-+		sb = sbinfo->si_sb;
-+		AuDebugOn(!sb);
-+		/* exclude the bottom branch */
-+		nfhsm = 0;
-+		bend = au_fhsm_bottom(sb);
-+		for (bindex = 0; bindex < bend; bindex++) {
-+			br = au_sbr(sb, bindex);
-+			if (au_br_fhsm(br->br_perm))
-+				nfhsm++;
-+		}
-+		err = -EMSGSIZE;
-+		if (nfhsm * sizeof(struct aufs_stbr) <= count) {
-+			atomic_set(&fhsm->fhsm_readable, 0);
-+			err = au_fhsm_do_read(sbinfo->si_sb, (void __user *)buf,
-+					     count);
-+		}
-+	}
-+	au_rw_read_unlock(&sbinfo->si_rwsem);
-+	if (!readable)
-+		goto need_data;
-+
-+out:
-+	return err;
-+}
-+
-+static int au_fhsm_release(struct inode *inode, struct file *file)
-+{
-+	struct au_sbinfo *sbinfo;
-+	struct au_fhsm *fhsm;
-+
-+	/* sb may already be dead */
-+	sbinfo = file->private_data;
-+	fhsm = &sbinfo->si_fhsm;
-+	spin_lock(&fhsm->fhsm_spin);
-+	fhsm->fhsm_pid = 0;
-+	spin_unlock(&fhsm->fhsm_spin);
-+	kobject_put(&sbinfo->si_kobj);
-+
-+	return 0;
-+}
-+
-+static const struct file_operations au_fhsm_fops = {
-+	.owner		= THIS_MODULE,
-+	.llseek		= noop_llseek,
-+	.read		= au_fhsm_read,
-+	.poll		= au_fhsm_poll,
-+	.release	= au_fhsm_release
-+};
-+
-+int au_fhsm_fd(struct super_block *sb, int oflags)
-+{
-+	int err, fd;
-+	struct au_sbinfo *sbinfo;
-+	struct au_fhsm *fhsm;
-+
-+	err = -EPERM;
-+	if (unlikely(!capable(CAP_SYS_ADMIN)))
-+		goto out;
-+
-+	err = -EINVAL;
-+	if (unlikely(oflags & ~(O_CLOEXEC | O_NONBLOCK)))
-+		goto out;
-+
-+	err = 0;
-+	sbinfo = au_sbi(sb);
-+	fhsm = &sbinfo->si_fhsm;
-+	spin_lock(&fhsm->fhsm_spin);
-+	if (!fhsm->fhsm_pid)
-+		fhsm->fhsm_pid = current->pid;
-+	else
-+		err = -EBUSY;
-+	spin_unlock(&fhsm->fhsm_spin);
-+	if (unlikely(err))
-+		goto out;
-+
-+	oflags |= O_RDONLY;
-+	/* oflags |= FMODE_NONOTIFY; */
-+	fd = anon_inode_getfd("[aufs_fhsm]", &au_fhsm_fops, sbinfo, oflags);
-+	err = fd;
-+	if (unlikely(fd < 0))
-+		goto out_pid;
-+
-+	/* succeed reglardless 'fhsm' status */
-+	kobject_get(&sbinfo->si_kobj);
-+	si_noflush_read_lock(sb);
-+	if (au_ftest_si(sbinfo, FHSM))
-+		au_fhsm_wrote_all(sb, /*force*/0);
-+	si_read_unlock(sb);
-+	goto out; /* success */
-+
-+out_pid:
-+	spin_lock(&fhsm->fhsm_spin);
-+	fhsm->fhsm_pid = 0;
-+	spin_unlock(&fhsm->fhsm_spin);
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+int au_fhsm_br_alloc(struct au_branch *br)
-+{
-+	int err;
-+
-+	err = 0;
-+	br->br_fhsm = kmalloc(sizeof(*br->br_fhsm), GFP_NOFS);
-+	if (br->br_fhsm)
-+		au_br_fhsm_init(br->br_fhsm);
-+	else
-+		err = -ENOMEM;
-+
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+void au_fhsm_fin(struct super_block *sb)
-+{
-+	au_fhsm_notify(sb, /*val*/-1);
-+}
-+
-+void au_fhsm_init(struct au_sbinfo *sbinfo)
-+{
-+	struct au_fhsm *fhsm;
-+
-+	fhsm = &sbinfo->si_fhsm;
-+	spin_lock_init(&fhsm->fhsm_spin);
-+	init_waitqueue_head(&fhsm->fhsm_wqh);
-+	atomic_set(&fhsm->fhsm_readable, 0);
-+	fhsm->fhsm_expire
-+		= msecs_to_jiffies(AUFS_FHSM_CACHE_DEF_SEC * MSEC_PER_SEC);
-+	fhsm->fhsm_bottom = -1;
-+}
-+
-+void au_fhsm_set(struct au_sbinfo *sbinfo, unsigned int sec)
-+{
-+	sbinfo->si_fhsm.fhsm_expire
-+		= msecs_to_jiffies(sec * MSEC_PER_SEC);
-+}
-+
-+void au_fhsm_show(struct seq_file *seq, struct au_sbinfo *sbinfo)
-+{
-+	unsigned int u;
-+
-+	if (!au_ftest_si(sbinfo, FHSM))
-+		return;
-+
-+	u = jiffies_to_msecs(sbinfo->si_fhsm.fhsm_expire) / MSEC_PER_SEC;
-+	if (u != AUFS_FHSM_CACHE_DEF_SEC)
-+		seq_printf(seq, ",fhsm_sec=%u", u);
-+}
-diff -Nur linux-4.1.10.orig/fs/aufs/file.c linux-4.1.10/fs/aufs/file.c
---- linux-4.1.10.orig/fs/aufs/file.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/file.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,841 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * handling file/dir, and address_space operation
-+ */
-+
-+#ifdef CONFIG_AUFS_DEBUG
-+#include <linux/migrate.h>
-+#endif
-+#include <linux/pagemap.h>
-+#include "aufs.h"
-+
-+/* drop flags for writing */
-+unsigned int au_file_roflags(unsigned int flags)
-+{
-+	flags &= ~(O_WRONLY | O_RDWR | O_APPEND | O_CREAT | O_TRUNC);
-+	flags |= O_RDONLY | O_NOATIME;
-+	return flags;
-+}
-+
-+/* common functions to regular file and dir */
-+struct file *au_h_open(struct dentry *dentry, aufs_bindex_t bindex, int flags,
-+		       struct file *file, int force_wr)
-+{
-+	struct file *h_file;
-+	struct dentry *h_dentry;
-+	struct inode *h_inode;
-+	struct super_block *sb;
-+	struct au_branch *br;
-+	struct path h_path;
-+	int err;
-+
-+	/* a race condition can happen between open and unlink/rmdir */
-+	h_file = ERR_PTR(-ENOENT);
-+	h_dentry = au_h_dptr(dentry, bindex);
-+	if (au_test_nfsd() && (!h_dentry || d_is_negative(h_dentry)))
-+		goto out;
-+	h_inode = d_inode(h_dentry);
-+	spin_lock(&h_dentry->d_lock);
-+	err = (!d_unhashed(dentry) && d_unlinked(h_dentry))
-+		/* || !d_inode(dentry)->i_nlink */
-+		;
-+	spin_unlock(&h_dentry->d_lock);
-+	if (unlikely(err))
-+		goto out;
-+
-+	sb = dentry->d_sb;
-+	br = au_sbr(sb, bindex);
-+	err = au_br_test_oflag(flags, br);
-+	h_file = ERR_PTR(err);
-+	if (unlikely(err))
-+		goto out;
-+
-+	/* drop flags for writing */
-+	if (au_test_ro(sb, bindex, d_inode(dentry))) {
-+		if (force_wr && !(flags & O_WRONLY))
-+			force_wr = 0;
-+		flags = au_file_roflags(flags);
-+		if (force_wr) {
-+			h_file = ERR_PTR(-EROFS);
-+			flags = au_file_roflags(flags);
-+			if (unlikely(vfsub_native_ro(h_inode)
-+				     || IS_APPEND(h_inode)))
-+				goto out;
-+			flags &= ~O_ACCMODE;
-+			flags |= O_WRONLY;
-+		}
-+	}
-+	flags &= ~O_CREAT;
-+	atomic_inc(&br->br_count);
-+	h_path.dentry = h_dentry;
-+	h_path.mnt = au_br_mnt(br);
-+	h_file = vfsub_dentry_open(&h_path, flags);
-+	if (IS_ERR(h_file))
-+		goto out_br;
-+
-+	if (flags & __FMODE_EXEC) {
-+		err = deny_write_access(h_file);
-+		if (unlikely(err)) {
-+			fput(h_file);
-+			h_file = ERR_PTR(err);
-+			goto out_br;
-+		}
-+	}
-+	fsnotify_open(h_file);
-+	goto out; /* success */
-+
-+out_br:
-+	atomic_dec(&br->br_count);
-+out:
-+	return h_file;
-+}
-+
-+static int au_cmoo(struct dentry *dentry)
-+{
-+	int err, cmoo;
-+	unsigned int udba;
-+	struct path h_path;
-+	struct au_pin pin;
-+	struct au_cp_generic cpg = {
-+		.dentry	= dentry,
-+		.bdst	= -1,
-+		.bsrc	= -1,
-+		.len	= -1,
-+		.pin	= &pin,
-+		.flags	= AuCpup_DTIME | AuCpup_HOPEN
-+	};
-+	struct inode *delegated;
-+	struct super_block *sb;
-+	struct au_sbinfo *sbinfo;
-+	struct au_fhsm *fhsm;
-+	pid_t pid;
-+	struct au_branch *br;
-+	struct dentry *parent;
-+	struct au_hinode *hdir;
-+
-+	DiMustWriteLock(dentry);
-+	IiMustWriteLock(d_inode(dentry));
-+
-+	err = 0;
-+	if (IS_ROOT(dentry))
-+		goto out;
-+	cpg.bsrc = au_dbstart(dentry);
-+	if (!cpg.bsrc)
-+		goto out;
-+
-+	sb = dentry->d_sb;
-+	sbinfo = au_sbi(sb);
-+	fhsm = &sbinfo->si_fhsm;
-+	pid = au_fhsm_pid(fhsm);
-+	if (pid
-+	    && (current->pid == pid
-+		|| current->real_parent->pid == pid))
-+		goto out;
-+
-+	br = au_sbr(sb, cpg.bsrc);
-+	cmoo = au_br_cmoo(br->br_perm);
-+	if (!cmoo)
-+		goto out;
-+	if (!d_is_reg(dentry))
-+		cmoo &= AuBrAttr_COO_ALL;
-+	if (!cmoo)
-+		goto out;
-+
-+	parent = dget_parent(dentry);
-+	di_write_lock_parent(parent);
-+	err = au_wbr_do_copyup_bu(dentry, cpg.bsrc - 1);
-+	cpg.bdst = err;
-+	if (unlikely(err < 0)) {
-+		err = 0;	/* there is no upper writable branch */
-+		goto out_dgrade;
-+	}
-+	AuDbg("bsrc %d, bdst %d\n", cpg.bsrc, cpg.bdst);
-+
-+	/* do not respect the coo attrib for the target branch */
-+	err = au_cpup_dirs(dentry, cpg.bdst);
-+	if (unlikely(err))
-+		goto out_dgrade;
-+
-+	di_downgrade_lock(parent, AuLock_IR);
-+	udba = au_opt_udba(sb);
-+	err = au_pin(&pin, dentry, cpg.bdst, udba,
-+		     AuPin_DI_LOCKED | AuPin_MNT_WRITE);
-+	if (unlikely(err))
-+		goto out_parent;
-+
-+	err = au_sio_cpup_simple(&cpg);
-+	au_unpin(&pin);
-+	if (unlikely(err))
-+		goto out_parent;
-+	if (!(cmoo & AuBrWAttr_MOO))
-+		goto out_parent; /* success */
-+
-+	err = au_pin(&pin, dentry, cpg.bsrc, udba,
-+		     AuPin_DI_LOCKED | AuPin_MNT_WRITE);
-+	if (unlikely(err))
-+		goto out_parent;
-+
-+	h_path.mnt = au_br_mnt(br);
-+	h_path.dentry = au_h_dptr(dentry, cpg.bsrc);
-+	hdir = au_hi(d_inode(parent), cpg.bsrc);
-+	delegated = NULL;
-+	err = vfsub_unlink(hdir->hi_inode, &h_path, &delegated, /*force*/1);
-+	au_unpin(&pin);
-+	/* todo: keep h_dentry or not? */
-+	if (unlikely(err == -EWOULDBLOCK)) {
-+		pr_warn("cannot retry for NFSv4 delegation"
-+			" for an internal unlink\n");
-+		iput(delegated);
-+	}
-+	if (unlikely(err)) {
-+		pr_err("unlink %pd after coo failed (%d), ignored\n",
-+		       dentry, err);
-+		err = 0;
-+	}
-+	goto out_parent; /* success */
-+
-+out_dgrade:
-+	di_downgrade_lock(parent, AuLock_IR);
-+out_parent:
-+	di_read_unlock(parent, AuLock_IR);
-+	dput(parent);
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+int au_do_open(struct file *file, struct au_do_open_args *args)
-+{
-+	int err, no_lock = args->no_lock;
-+	struct dentry *dentry;
-+	struct au_finfo *finfo;
-+
-+	if (!no_lock)
-+		err = au_finfo_init(file, args->fidir);
-+	else {
-+		lockdep_off();
-+		err = au_finfo_init(file, args->fidir);
-+		lockdep_on();
-+	}
-+	if (unlikely(err))
-+		goto out;
-+
-+	dentry = file->f_path.dentry;
-+	AuDebugOn(IS_ERR_OR_NULL(dentry));
-+	if (!no_lock) {
-+		di_write_lock_child(dentry);
-+		err = au_cmoo(dentry);
-+		di_downgrade_lock(dentry, AuLock_IR);
-+		if (!err)
-+			err = args->open(file, vfsub_file_flags(file), NULL);
-+		di_read_unlock(dentry, AuLock_IR);
-+	} else {
-+		err = au_cmoo(dentry);
-+		if (!err)
-+			err = args->open(file, vfsub_file_flags(file),
-+					 args->h_file);
-+		if (!err && au_fbstart(file) != au_dbstart(dentry))
-+			/*
-+			 * cmoo happens after h_file was opened.
-+			 * need to refresh file later.
-+			 */
-+			atomic_dec(&au_fi(file)->fi_generation);
-+	}
-+
-+	finfo = au_fi(file);
-+	if (!err) {
-+		finfo->fi_file = file;
-+		au_sphl_add(&finfo->fi_hlist,
-+			    &au_sbi(file->f_path.dentry->d_sb)->si_files);
-+	}
-+	if (!no_lock)
-+		fi_write_unlock(file);
-+	else {
-+		lockdep_off();
-+		fi_write_unlock(file);
-+		lockdep_on();
-+	}
-+	if (unlikely(err)) {
-+		finfo->fi_hdir = NULL;
-+		au_finfo_fin(file);
-+	}
-+
-+out:
-+	return err;
-+}
-+
-+int au_reopen_nondir(struct file *file)
-+{
-+	int err;
-+	aufs_bindex_t bstart;
-+	struct dentry *dentry;
-+	struct file *h_file, *h_file_tmp;
-+
-+	dentry = file->f_path.dentry;
-+	bstart = au_dbstart(dentry);
-+	h_file_tmp = NULL;
-+	if (au_fbstart(file) == bstart) {
-+		h_file = au_hf_top(file);
-+		if (file->f_mode == h_file->f_mode)
-+			return 0; /* success */
-+		h_file_tmp = h_file;
-+		get_file(h_file_tmp);
-+		au_set_h_fptr(file, bstart, NULL);
-+	}
-+	AuDebugOn(au_fi(file)->fi_hdir);
-+	/*
-+	 * it can happen
-+	 * file exists on both of rw and ro
-+	 * open --> dbstart and fbstart are both 0
-+	 * prepend a branch as rw, "rw" become ro
-+	 * remove rw/file
-+	 * delete the top branch, "rw" becomes rw again
-+	 *	--> dbstart is 1, fbstart is still 0
-+	 * write --> fbstart is 0 but dbstart is 1
-+	 */
-+	/* AuDebugOn(au_fbstart(file) < bstart); */
-+
-+	h_file = au_h_open(dentry, bstart, vfsub_file_flags(file) & ~O_TRUNC,
-+			   file, /*force_wr*/0);
-+	err = PTR_ERR(h_file);
-+	if (IS_ERR(h_file)) {
-+		if (h_file_tmp) {
-+			atomic_inc(&au_sbr(dentry->d_sb, bstart)->br_count);
-+			au_set_h_fptr(file, bstart, h_file_tmp);
-+			h_file_tmp = NULL;
-+		}
-+		goto out; /* todo: close all? */
-+	}
-+
-+	err = 0;
-+	au_set_fbstart(file, bstart);
-+	au_set_h_fptr(file, bstart, h_file);
-+	au_update_figen(file);
-+	/* todo: necessary? */
-+	/* file->f_ra = h_file->f_ra; */
-+
-+out:
-+	if (h_file_tmp)
-+		fput(h_file_tmp);
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static int au_reopen_wh(struct file *file, aufs_bindex_t btgt,
-+			struct dentry *hi_wh)
-+{
-+	int err;
-+	aufs_bindex_t bstart;
-+	struct au_dinfo *dinfo;
-+	struct dentry *h_dentry;
-+	struct au_hdentry *hdp;
-+
-+	dinfo = au_di(file->f_path.dentry);
-+	AuRwMustWriteLock(&dinfo->di_rwsem);
-+
-+	bstart = dinfo->di_bstart;
-+	dinfo->di_bstart = btgt;
-+	hdp = dinfo->di_hdentry;
-+	h_dentry = hdp[0 + btgt].hd_dentry;
-+	hdp[0 + btgt].hd_dentry = hi_wh;
-+	err = au_reopen_nondir(file);
-+	hdp[0 + btgt].hd_dentry = h_dentry;
-+	dinfo->di_bstart = bstart;
-+
-+	return err;
-+}
-+
-+static int au_ready_to_write_wh(struct file *file, loff_t len,
-+				aufs_bindex_t bcpup, struct au_pin *pin)
-+{
-+	int err;
-+	struct inode *inode, *h_inode;
-+	struct dentry *h_dentry, *hi_wh;
-+	struct au_cp_generic cpg = {
-+		.dentry	= file->f_path.dentry,
-+		.bdst	= bcpup,
-+		.bsrc	= -1,
-+		.len	= len,
-+		.pin	= pin
-+	};
-+
-+	au_update_dbstart(cpg.dentry);
-+	inode = d_inode(cpg.dentry);
-+	h_inode = NULL;
-+	if (au_dbstart(cpg.dentry) <= bcpup
-+	    && au_dbend(cpg.dentry) >= bcpup) {
-+		h_dentry = au_h_dptr(cpg.dentry, bcpup);
-+		if (h_dentry && d_is_positive(h_dentry))
-+			h_inode = d_inode(h_dentry);
-+	}
-+	hi_wh = au_hi_wh(inode, bcpup);
-+	if (!hi_wh && !h_inode)
-+		err = au_sio_cpup_wh(&cpg, file);
-+	else
-+		/* already copied-up after unlink */
-+		err = au_reopen_wh(file, bcpup, hi_wh);
-+
-+	if (!err
-+	    && (inode->i_nlink > 1
-+		|| (inode->i_state & I_LINKABLE))
-+	    && au_opt_test(au_mntflags(cpg.dentry->d_sb), PLINK))
-+		au_plink_append(inode, bcpup, au_h_dptr(cpg.dentry, bcpup));
-+
-+	return err;
-+}
-+
-+/*
-+ * prepare the @file for writing.
-+ */
-+int au_ready_to_write(struct file *file, loff_t len, struct au_pin *pin)
-+{
-+	int err;
-+	aufs_bindex_t dbstart;
-+	struct dentry *parent;
-+	struct inode *inode;
-+	struct super_block *sb;
-+	struct file *h_file;
-+	struct au_cp_generic cpg = {
-+		.dentry	= file->f_path.dentry,
-+		.bdst	= -1,
-+		.bsrc	= -1,
-+		.len	= len,
-+		.pin	= pin,
-+		.flags	= AuCpup_DTIME
-+	};
-+
-+	sb = cpg.dentry->d_sb;
-+	inode = d_inode(cpg.dentry);
-+	cpg.bsrc = au_fbstart(file);
-+	err = au_test_ro(sb, cpg.bsrc, inode);
-+	if (!err && (au_hf_top(file)->f_mode & FMODE_WRITE)) {
-+		err = au_pin(pin, cpg.dentry, cpg.bsrc, AuOpt_UDBA_NONE,
-+			     /*flags*/0);
-+		goto out;
-+	}
-+
-+	/* need to cpup or reopen */
-+	parent = dget_parent(cpg.dentry);
-+	di_write_lock_parent(parent);
-+	err = AuWbrCopyup(au_sbi(sb), cpg.dentry);
-+	cpg.bdst = err;
-+	if (unlikely(err < 0))
-+		goto out_dgrade;
-+	err = 0;
-+
-+	if (!d_unhashed(cpg.dentry) && !au_h_dptr(parent, cpg.bdst)) {
-+		err = au_cpup_dirs(cpg.dentry, cpg.bdst);
-+		if (unlikely(err))
-+			goto out_dgrade;
-+	}
-+
-+	err = au_pin(pin, cpg.dentry, cpg.bdst, AuOpt_UDBA_NONE,
-+		     AuPin_DI_LOCKED | AuPin_MNT_WRITE);
-+	if (unlikely(err))
-+		goto out_dgrade;
-+
-+	dbstart = au_dbstart(cpg.dentry);
-+	if (dbstart <= cpg.bdst)
-+		cpg.bsrc = cpg.bdst;
-+
-+	if (dbstart <= cpg.bdst		/* just reopen */
-+	    || !d_unhashed(cpg.dentry)	/* copyup and reopen */
-+		) {
-+		h_file = au_h_open_pre(cpg.dentry, cpg.bsrc, /*force_wr*/0);
-+		if (IS_ERR(h_file))
-+			err = PTR_ERR(h_file);
-+		else {
-+			di_downgrade_lock(parent, AuLock_IR);
-+			if (dbstart > cpg.bdst)
-+				err = au_sio_cpup_simple(&cpg);
-+			if (!err)
-+				err = au_reopen_nondir(file);
-+			au_h_open_post(cpg.dentry, cpg.bsrc, h_file);
-+		}
-+	} else {			/* copyup as wh and reopen */
-+		/*
-+		 * since writable hfsplus branch is not supported,
-+		 * h_open_pre/post() are unnecessary.
-+		 */
-+		err = au_ready_to_write_wh(file, len, cpg.bdst, pin);
-+		di_downgrade_lock(parent, AuLock_IR);
-+	}
-+
-+	if (!err) {
-+		au_pin_set_parent_lflag(pin, /*lflag*/0);
-+		goto out_dput; /* success */
-+	}
-+	au_unpin(pin);
-+	goto out_unlock;
-+
-+out_dgrade:
-+	di_downgrade_lock(parent, AuLock_IR);
-+out_unlock:
-+	di_read_unlock(parent, AuLock_IR);
-+out_dput:
-+	dput(parent);
-+out:
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+int au_do_flush(struct file *file, fl_owner_t id,
-+		int (*flush)(struct file *file, fl_owner_t id))
-+{
-+	int err;
-+	struct super_block *sb;
-+	struct inode *inode;
-+
-+	inode = file_inode(file);
-+	sb = inode->i_sb;
-+	si_noflush_read_lock(sb);
-+	fi_read_lock(file);
-+	ii_read_lock_child(inode);
-+
-+	err = flush(file, id);
-+	au_cpup_attr_timesizes(inode);
-+
-+	ii_read_unlock(inode);
-+	fi_read_unlock(file);
-+	si_read_unlock(sb);
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static int au_file_refresh_by_inode(struct file *file, int *need_reopen)
-+{
-+	int err;
-+	struct au_pin pin;
-+	struct au_finfo *finfo;
-+	struct dentry *parent, *hi_wh;
-+	struct inode *inode;
-+	struct super_block *sb;
-+	struct au_cp_generic cpg = {
-+		.dentry	= file->f_path.dentry,
-+		.bdst	= -1,
-+		.bsrc	= -1,
-+		.len	= -1,
-+		.pin	= &pin,
-+		.flags	= AuCpup_DTIME
-+	};
-+
-+	FiMustWriteLock(file);
-+
-+	err = 0;
-+	finfo = au_fi(file);
-+	sb = cpg.dentry->d_sb;
-+	inode = d_inode(cpg.dentry);
-+	cpg.bdst = au_ibstart(inode);
-+	if (cpg.bdst == finfo->fi_btop || IS_ROOT(cpg.dentry))
-+		goto out;
-+
-+	parent = dget_parent(cpg.dentry);
-+	if (au_test_ro(sb, cpg.bdst, inode)) {
-+		di_read_lock_parent(parent, !AuLock_IR);
-+		err = AuWbrCopyup(au_sbi(sb), cpg.dentry);
-+		cpg.bdst = err;
-+		di_read_unlock(parent, !AuLock_IR);
-+		if (unlikely(err < 0))
-+			goto out_parent;
-+		err = 0;
-+	}
-+
-+	di_read_lock_parent(parent, AuLock_IR);
-+	hi_wh = au_hi_wh(inode, cpg.bdst);
-+	if (!S_ISDIR(inode->i_mode)
-+	    && au_opt_test(au_mntflags(sb), PLINK)
-+	    && au_plink_test(inode)
-+	    && !d_unhashed(cpg.dentry)
-+	    && cpg.bdst < au_dbstart(cpg.dentry)) {
-+		err = au_test_and_cpup_dirs(cpg.dentry, cpg.bdst);
-+		if (unlikely(err))
-+			goto out_unlock;
-+
-+		/* always superio. */
-+		err = au_pin(&pin, cpg.dentry, cpg.bdst, AuOpt_UDBA_NONE,
-+			     AuPin_DI_LOCKED | AuPin_MNT_WRITE);
-+		if (!err) {
-+			err = au_sio_cpup_simple(&cpg);
-+			au_unpin(&pin);
-+		}
-+	} else if (hi_wh) {
-+		/* already copied-up after unlink */
-+		err = au_reopen_wh(file, cpg.bdst, hi_wh);
-+		*need_reopen = 0;
-+	}
-+
-+out_unlock:
-+	di_read_unlock(parent, AuLock_IR);
-+out_parent:
-+	dput(parent);
-+out:
-+	return err;
-+}
-+
-+static void au_do_refresh_dir(struct file *file)
-+{
-+	aufs_bindex_t bindex, bend, new_bindex, brid;
-+	struct au_hfile *p, tmp, *q;
-+	struct au_finfo *finfo;
-+	struct super_block *sb;
-+	struct au_fidir *fidir;
-+
-+	FiMustWriteLock(file);
-+
-+	sb = file->f_path.dentry->d_sb;
-+	finfo = au_fi(file);
-+	fidir = finfo->fi_hdir;
-+	AuDebugOn(!fidir);
-+	p = fidir->fd_hfile + finfo->fi_btop;
-+	brid = p->hf_br->br_id;
-+	bend = fidir->fd_bbot;
-+	for (bindex = finfo->fi_btop; bindex <= bend; bindex++, p++) {
-+		if (!p->hf_file)
-+			continue;
-+
-+		new_bindex = au_br_index(sb, p->hf_br->br_id);
-+		if (new_bindex == bindex)
-+			continue;
-+		if (new_bindex < 0) {
-+			au_set_h_fptr(file, bindex, NULL);
-+			continue;
-+		}
-+
-+		/* swap two lower inode, and loop again */
-+		q = fidir->fd_hfile + new_bindex;
-+		tmp = *q;
-+		*q = *p;
-+		*p = tmp;
-+		if (tmp.hf_file) {
-+			bindex--;
-+			p--;
-+		}
-+	}
-+
-+	p = fidir->fd_hfile;
-+	if (!au_test_mmapped(file) && !d_unlinked(file->f_path.dentry)) {
-+		bend = au_sbend(sb);
-+		for (finfo->fi_btop = 0; finfo->fi_btop <= bend;
-+		     finfo->fi_btop++, p++)
-+			if (p->hf_file) {
-+				if (file_inode(p->hf_file))
-+					break;
-+				au_hfput(p, file);
-+			}
-+	} else {
-+		bend = au_br_index(sb, brid);
-+		for (finfo->fi_btop = 0; finfo->fi_btop < bend;
-+		     finfo->fi_btop++, p++)
-+			if (p->hf_file)
-+				au_hfput(p, file);
-+		bend = au_sbend(sb);
-+	}
-+
-+	p = fidir->fd_hfile + bend;
-+	for (fidir->fd_bbot = bend; fidir->fd_bbot >= finfo->fi_btop;
-+	     fidir->fd_bbot--, p--)
-+		if (p->hf_file) {
-+			if (file_inode(p->hf_file))
-+				break;
-+			au_hfput(p, file);
-+		}
-+	AuDebugOn(fidir->fd_bbot < finfo->fi_btop);
-+}
-+
-+/*
-+ * after branch manipulating, refresh the file.
-+ */
-+static int refresh_file(struct file *file, int (*reopen)(struct file *file))
-+{
-+	int err, need_reopen;
-+	aufs_bindex_t bend, bindex;
-+	struct dentry *dentry;
-+	struct au_finfo *finfo;
-+	struct au_hfile *hfile;
-+
-+	dentry = file->f_path.dentry;
-+	finfo = au_fi(file);
-+	if (!finfo->fi_hdir) {
-+		hfile = &finfo->fi_htop;
-+		AuDebugOn(!hfile->hf_file);
-+		bindex = au_br_index(dentry->d_sb, hfile->hf_br->br_id);
-+		AuDebugOn(bindex < 0);
-+		if (bindex != finfo->fi_btop)
-+			au_set_fbstart(file, bindex);
-+	} else {
-+		err = au_fidir_realloc(finfo, au_sbend(dentry->d_sb) + 1);
-+		if (unlikely(err))
-+			goto out;
-+		au_do_refresh_dir(file);
-+	}
-+
-+	err = 0;
-+	need_reopen = 1;
-+	if (!au_test_mmapped(file))
-+		err = au_file_refresh_by_inode(file, &need_reopen);
-+	if (!err && need_reopen && !d_unlinked(dentry))
-+		err = reopen(file);
-+	if (!err) {
-+		au_update_figen(file);
-+		goto out; /* success */
-+	}
-+
-+	/* error, close all lower files */
-+	if (finfo->fi_hdir) {
-+		bend = au_fbend_dir(file);
-+		for (bindex = au_fbstart(file); bindex <= bend; bindex++)
-+			au_set_h_fptr(file, bindex, NULL);
-+	}
-+
-+out:
-+	return err;
-+}
-+
-+/* common function to regular file and dir */
-+int au_reval_and_lock_fdi(struct file *file, int (*reopen)(struct file *file),
-+			  int wlock)
-+{
-+	int err;
-+	unsigned int sigen, figen;
-+	aufs_bindex_t bstart;
-+	unsigned char pseudo_link;
-+	struct dentry *dentry;
-+	struct inode *inode;
-+
-+	err = 0;
-+	dentry = file->f_path.dentry;
-+	inode = d_inode(dentry);
-+	sigen = au_sigen(dentry->d_sb);
-+	fi_write_lock(file);
-+	figen = au_figen(file);
-+	di_write_lock_child(dentry);
-+	bstart = au_dbstart(dentry);
-+	pseudo_link = (bstart != au_ibstart(inode));
-+	if (sigen == figen && !pseudo_link && au_fbstart(file) == bstart) {
-+		if (!wlock) {
-+			di_downgrade_lock(dentry, AuLock_IR);
-+			fi_downgrade_lock(file);
-+		}
-+		goto out; /* success */
-+	}
-+
-+	AuDbg("sigen %d, figen %d\n", sigen, figen);
-+	if (au_digen_test(dentry, sigen)) {
-+		err = au_reval_dpath(dentry, sigen);
-+		AuDebugOn(!err && au_digen_test(dentry, sigen));
-+	}
-+
-+	if (!err)
-+		err = refresh_file(file, reopen);
-+	if (!err) {
-+		if (!wlock) {
-+			di_downgrade_lock(dentry, AuLock_IR);
-+			fi_downgrade_lock(file);
-+		}
-+	} else {
-+		di_write_unlock(dentry);
-+		fi_write_unlock(file);
-+	}
-+
-+out:
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* cf. aufs_nopage() */
-+/* for madvise(2) */
-+static int aufs_readpage(struct file *file __maybe_unused, struct page *page)
-+{
-+	unlock_page(page);
-+	return 0;
-+}
-+
-+/* it will never be called, but necessary to support O_DIRECT */
-+static ssize_t aufs_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
-+			      loff_t offset)
-+{ BUG(); return 0; }
-+
-+/* they will never be called. */
-+#ifdef CONFIG_AUFS_DEBUG
-+static int aufs_write_begin(struct file *file, struct address_space *mapping,
-+			    loff_t pos, unsigned len, unsigned flags,
-+			    struct page **pagep, void **fsdata)
-+{ AuUnsupport(); return 0; }
-+static int aufs_write_end(struct file *file, struct address_space *mapping,
-+			  loff_t pos, unsigned len, unsigned copied,
-+			  struct page *page, void *fsdata)
-+{ AuUnsupport(); return 0; }
-+static int aufs_writepage(struct page *page, struct writeback_control *wbc)
-+{ AuUnsupport(); return 0; }
-+
-+static int aufs_set_page_dirty(struct page *page)
-+{ AuUnsupport(); return 0; }
-+static void aufs_invalidatepage(struct page *page, unsigned int offset,
-+				unsigned int length)
-+{ AuUnsupport(); }
-+static int aufs_releasepage(struct page *page, gfp_t gfp)
-+{ AuUnsupport(); return 0; }
-+static int aufs_migratepage(struct address_space *mapping, struct page *newpage,
-+			    struct page *page, enum migrate_mode mode)
-+{ AuUnsupport(); return 0; }
-+static int aufs_launder_page(struct page *page)
-+{ AuUnsupport(); return 0; }
-+static int aufs_is_partially_uptodate(struct page *page,
-+				      unsigned long from,
-+				      unsigned long count)
-+{ AuUnsupport(); return 0; }
-+static void aufs_is_dirty_writeback(struct page *page, bool *dirty,
-+				    bool *writeback)
-+{ AuUnsupport(); }
-+static int aufs_error_remove_page(struct address_space *mapping,
-+				  struct page *page)
-+{ AuUnsupport(); return 0; }
-+static int aufs_swap_activate(struct swap_info_struct *sis, struct file *file,
-+			      sector_t *span)
-+{ AuUnsupport(); return 0; }
-+static void aufs_swap_deactivate(struct file *file)
-+{ AuUnsupport(); }
-+#endif /* CONFIG_AUFS_DEBUG */
-+
-+const struct address_space_operations aufs_aop = {
-+	.readpage		= aufs_readpage,
-+	.direct_IO		= aufs_direct_IO,
-+#ifdef CONFIG_AUFS_DEBUG
-+	.writepage		= aufs_writepage,
-+	/* no writepages, because of writepage */
-+	.set_page_dirty		= aufs_set_page_dirty,
-+	/* no readpages, because of readpage */
-+	.write_begin		= aufs_write_begin,
-+	.write_end		= aufs_write_end,
-+	/* no bmap, no block device */
-+	.invalidatepage		= aufs_invalidatepage,
-+	.releasepage		= aufs_releasepage,
-+	.migratepage		= aufs_migratepage,
-+	.launder_page		= aufs_launder_page,
-+	.is_partially_uptodate	= aufs_is_partially_uptodate,
-+	.is_dirty_writeback	= aufs_is_dirty_writeback,
-+	.error_remove_page	= aufs_error_remove_page,
-+	.swap_activate		= aufs_swap_activate,
-+	.swap_deactivate	= aufs_swap_deactivate
-+#endif /* CONFIG_AUFS_DEBUG */
-+};
-diff -Nur linux-4.1.10.orig/fs/aufs/file.h linux-4.1.10/fs/aufs/file.h
---- linux-4.1.10.orig/fs/aufs/file.h	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/file.h	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,291 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * file operations
-+ */
-+
-+#ifndef __AUFS_FILE_H__
-+#define __AUFS_FILE_H__
-+
-+#ifdef __KERNEL__
-+
-+#include <linux/file.h>
-+#include <linux/fs.h>
-+#include <linux/poll.h>
-+#include "rwsem.h"
-+
-+struct au_branch;
-+struct au_hfile {
-+	struct file		*hf_file;
-+	struct au_branch	*hf_br;
-+};
-+
-+struct au_vdir;
-+struct au_fidir {
-+	aufs_bindex_t		fd_bbot;
-+	aufs_bindex_t		fd_nent;
-+	struct au_vdir		*fd_vdir_cache;
-+	struct au_hfile		fd_hfile[];
-+};
-+
-+static inline int au_fidir_sz(int nent)
-+{
-+	AuDebugOn(nent < 0);
-+	return sizeof(struct au_fidir) + sizeof(struct au_hfile) * nent;
-+}
-+
-+struct au_finfo {
-+	atomic_t		fi_generation;
-+
-+	struct au_rwsem		fi_rwsem;
-+	aufs_bindex_t		fi_btop;
-+
-+	/* do not union them */
-+	struct {				/* for non-dir */
-+		struct au_hfile			fi_htop;
-+		atomic_t			fi_mmapped;
-+	};
-+	struct au_fidir		*fi_hdir;	/* for dir only */
-+
-+	struct hlist_node	fi_hlist;
-+	struct file		*fi_file;	/* very ugly */
-+} ____cacheline_aligned_in_smp;
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* file.c */
-+extern const struct address_space_operations aufs_aop;
-+unsigned int au_file_roflags(unsigned int flags);
-+struct file *au_h_open(struct dentry *dentry, aufs_bindex_t bindex, int flags,
-+		       struct file *file, int force_wr);
-+struct au_do_open_args {
-+	int		no_lock;
-+	int		(*open)(struct file *file, int flags,
-+				struct file *h_file);
-+	struct au_fidir	*fidir;
-+	struct file	*h_file;
-+};
-+int au_do_open(struct file *file, struct au_do_open_args *args);
-+int au_reopen_nondir(struct file *file);
-+struct au_pin;
-+int au_ready_to_write(struct file *file, loff_t len, struct au_pin *pin);
-+int au_reval_and_lock_fdi(struct file *file, int (*reopen)(struct file *file),
-+			  int wlock);
-+int au_do_flush(struct file *file, fl_owner_t id,
-+		int (*flush)(struct file *file, fl_owner_t id));
-+
-+/* poll.c */
-+#ifdef CONFIG_AUFS_POLL
-+unsigned int aufs_poll(struct file *file, poll_table *wait);
-+#endif
-+
-+#ifdef CONFIG_AUFS_BR_HFSPLUS
-+/* hfsplus.c */
-+struct file *au_h_open_pre(struct dentry *dentry, aufs_bindex_t bindex,
-+			   int force_wr);
-+void au_h_open_post(struct dentry *dentry, aufs_bindex_t bindex,
-+		    struct file *h_file);
-+#else
-+AuStub(struct file *, au_h_open_pre, return NULL, struct dentry *dentry,
-+       aufs_bindex_t bindex, int force_wr)
-+AuStubVoid(au_h_open_post, struct dentry *dentry, aufs_bindex_t bindex,
-+	   struct file *h_file);
-+#endif
-+
-+/* f_op.c */
-+extern const struct file_operations aufs_file_fop;
-+int au_do_open_nondir(struct file *file, int flags, struct file *h_file);
-+int aufs_release_nondir(struct inode *inode __maybe_unused, struct file *file);
-+struct file *au_read_pre(struct file *file, int keep_fi);
-+
-+/* finfo.c */
-+void au_hfput(struct au_hfile *hf, struct file *file);
-+void au_set_h_fptr(struct file *file, aufs_bindex_t bindex,
-+		   struct file *h_file);
-+
-+void au_update_figen(struct file *file);
-+struct au_fidir *au_fidir_alloc(struct super_block *sb);
-+int au_fidir_realloc(struct au_finfo *finfo, int nbr);
-+
-+void au_fi_init_once(void *_fi);
-+void au_finfo_fin(struct file *file);
-+int au_finfo_init(struct file *file, struct au_fidir *fidir);
-+
-+/* ioctl.c */
-+long aufs_ioctl_nondir(struct file *file, unsigned int cmd, unsigned long arg);
-+#ifdef CONFIG_COMPAT
-+long aufs_compat_ioctl_dir(struct file *file, unsigned int cmd,
-+			   unsigned long arg);
-+long aufs_compat_ioctl_nondir(struct file *file, unsigned int cmd,
-+			      unsigned long arg);
-+#endif
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static inline struct au_finfo *au_fi(struct file *file)
-+{
-+	return file->private_data;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/*
-+ * fi_read_lock, fi_write_lock,
-+ * fi_read_unlock, fi_write_unlock, fi_downgrade_lock
-+ */
-+AuSimpleRwsemFuncs(fi, struct file *f, &au_fi(f)->fi_rwsem);
-+
-+#define FiMustNoWaiters(f)	AuRwMustNoWaiters(&au_fi(f)->fi_rwsem)
-+#define FiMustAnyLock(f)	AuRwMustAnyLock(&au_fi(f)->fi_rwsem)
-+#define FiMustWriteLock(f)	AuRwMustWriteLock(&au_fi(f)->fi_rwsem)
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* todo: hard/soft set? */
-+static inline aufs_bindex_t au_fbstart(struct file *file)
-+{
-+	FiMustAnyLock(file);
-+	return au_fi(file)->fi_btop;
-+}
-+
-+static inline aufs_bindex_t au_fbend_dir(struct file *file)
-+{
-+	FiMustAnyLock(file);
-+	AuDebugOn(!au_fi(file)->fi_hdir);
-+	return au_fi(file)->fi_hdir->fd_bbot;
-+}
-+
-+static inline struct au_vdir *au_fvdir_cache(struct file *file)
-+{
-+	FiMustAnyLock(file);
-+	AuDebugOn(!au_fi(file)->fi_hdir);
-+	return au_fi(file)->fi_hdir->fd_vdir_cache;
-+}
-+
-+static inline void au_set_fbstart(struct file *file, aufs_bindex_t bindex)
-+{
-+	FiMustWriteLock(file);
-+	au_fi(file)->fi_btop = bindex;
-+}
-+
-+static inline void au_set_fbend_dir(struct file *file, aufs_bindex_t bindex)
-+{
-+	FiMustWriteLock(file);
-+	AuDebugOn(!au_fi(file)->fi_hdir);
-+	au_fi(file)->fi_hdir->fd_bbot = bindex;
-+}
-+
-+static inline void au_set_fvdir_cache(struct file *file,
-+				      struct au_vdir *vdir_cache)
-+{
-+	FiMustWriteLock(file);
-+	AuDebugOn(!au_fi(file)->fi_hdir);
-+	au_fi(file)->fi_hdir->fd_vdir_cache = vdir_cache;
-+}
-+
-+static inline struct file *au_hf_top(struct file *file)
-+{
-+	FiMustAnyLock(file);
-+	AuDebugOn(au_fi(file)->fi_hdir);
-+	return au_fi(file)->fi_htop.hf_file;
-+}
-+
-+static inline struct file *au_hf_dir(struct file *file, aufs_bindex_t bindex)
-+{
-+	FiMustAnyLock(file);
-+	AuDebugOn(!au_fi(file)->fi_hdir);
-+	return au_fi(file)->fi_hdir->fd_hfile[0 + bindex].hf_file;
-+}
-+
-+/* todo: memory barrier? */
-+static inline unsigned int au_figen(struct file *f)
-+{
-+	return atomic_read(&au_fi(f)->fi_generation);
-+}
-+
-+static inline void au_set_mmapped(struct file *f)
-+{
-+	if (atomic_inc_return(&au_fi(f)->fi_mmapped))
-+		return;
-+	pr_warn("fi_mmapped wrapped around\n");
-+	while (!atomic_inc_return(&au_fi(f)->fi_mmapped))
-+		;
-+}
-+
-+static inline void au_unset_mmapped(struct file *f)
-+{
-+	atomic_dec(&au_fi(f)->fi_mmapped);
-+}
-+
-+static inline int au_test_mmapped(struct file *f)
-+{
-+	return atomic_read(&au_fi(f)->fi_mmapped);
-+}
-+
-+/* customize vma->vm_file */
-+
-+static inline void au_do_vm_file_reset(struct vm_area_struct *vma,
-+				       struct file *file)
-+{
-+	struct file *f;
-+
-+	f = vma->vm_file;
-+	get_file(file);
-+	vma->vm_file = file;
-+	fput(f);
-+}
-+
-+#ifdef CONFIG_MMU
-+#define AuDbgVmRegion(file, vma) do {} while (0)
-+
-+static inline void au_vm_file_reset(struct vm_area_struct *vma,
-+				    struct file *file)
-+{
-+	au_do_vm_file_reset(vma, file);
-+}
-+#else
-+#define AuDbgVmRegion(file, vma) \
-+	AuDebugOn((vma)->vm_region && (vma)->vm_region->vm_file != (file))
-+
-+static inline void au_vm_file_reset(struct vm_area_struct *vma,
-+				    struct file *file)
-+{
-+	struct file *f;
-+
-+	au_do_vm_file_reset(vma, file);
-+	f = vma->vm_region->vm_file;
-+	get_file(file);
-+	vma->vm_region->vm_file = file;
-+	fput(f);
-+}
-+#endif /* CONFIG_MMU */
-+
-+/* handle vma->vm_prfile */
-+static inline void au_vm_prfile_set(struct vm_area_struct *vma,
-+				    struct file *file)
-+{
-+	get_file(file);
-+	vma->vm_prfile = file;
-+#ifndef CONFIG_MMU
-+	get_file(file);
-+	vma->vm_region->vm_prfile = file;
-+#endif
-+}
-+
-+#endif /* __KERNEL__ */
-+#endif /* __AUFS_FILE_H__ */
-diff -Nur linux-4.1.10.orig/fs/aufs/finfo.c linux-4.1.10/fs/aufs/finfo.c
---- linux-4.1.10.orig/fs/aufs/finfo.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/finfo.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,157 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * file private data
-+ */
-+
-+#include "aufs.h"
-+
-+void au_hfput(struct au_hfile *hf, struct file *file)
-+{
-+	/* todo: direct access f_flags */
-+	if (vfsub_file_flags(file) & __FMODE_EXEC)
-+		allow_write_access(hf->hf_file);
-+	fput(hf->hf_file);
-+	hf->hf_file = NULL;
-+	atomic_dec(&hf->hf_br->br_count);
-+	hf->hf_br = NULL;
-+}
-+
-+void au_set_h_fptr(struct file *file, aufs_bindex_t bindex, struct file *val)
-+{
-+	struct au_finfo *finfo = au_fi(file);
-+	struct au_hfile *hf;
-+	struct au_fidir *fidir;
-+
-+	fidir = finfo->fi_hdir;
-+	if (!fidir) {
-+		AuDebugOn(finfo->fi_btop != bindex);
-+		hf = &finfo->fi_htop;
-+	} else
-+		hf = fidir->fd_hfile + bindex;
-+
-+	if (hf && hf->hf_file)
-+		au_hfput(hf, file);
-+	if (val) {
-+		FiMustWriteLock(file);
-+		AuDebugOn(IS_ERR_OR_NULL(file->f_path.dentry));
-+		hf->hf_file = val;
-+		hf->hf_br = au_sbr(file->f_path.dentry->d_sb, bindex);
-+	}
-+}
-+
-+void au_update_figen(struct file *file)
-+{
-+	atomic_set(&au_fi(file)->fi_generation, au_digen(file->f_path.dentry));
-+	/* smp_mb(); */ /* atomic_set */
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+struct au_fidir *au_fidir_alloc(struct super_block *sb)
-+{
-+	struct au_fidir *fidir;
-+	int nbr;
-+
-+	nbr = au_sbend(sb) + 1;
-+	if (nbr < 2)
-+		nbr = 2; /* initial allocate for 2 branches */
-+	fidir = kzalloc(au_fidir_sz(nbr), GFP_NOFS);
-+	if (fidir) {
-+		fidir->fd_bbot = -1;
-+		fidir->fd_nent = nbr;
-+		fidir->fd_vdir_cache = NULL;
-+	}
-+
-+	return fidir;
-+}
-+
-+int au_fidir_realloc(struct au_finfo *finfo, int nbr)
-+{
-+	int err;
-+	struct au_fidir *fidir, *p;
-+
-+	AuRwMustWriteLock(&finfo->fi_rwsem);
-+	fidir = finfo->fi_hdir;
-+	AuDebugOn(!fidir);
-+
-+	err = -ENOMEM;
-+	p = au_kzrealloc(fidir, au_fidir_sz(fidir->fd_nent), au_fidir_sz(nbr),
-+			 GFP_NOFS);
-+	if (p) {
-+		p->fd_nent = nbr;
-+		finfo->fi_hdir = p;
-+		err = 0;
-+	}
-+
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+void au_finfo_fin(struct file *file)
-+{
-+	struct au_finfo *finfo;
-+
-+	au_nfiles_dec(file->f_path.dentry->d_sb);
-+
-+	finfo = au_fi(file);
-+	AuDebugOn(finfo->fi_hdir);
-+	AuRwDestroy(&finfo->fi_rwsem);
-+	au_cache_free_finfo(finfo);
-+}
-+
-+void au_fi_init_once(void *_finfo)
-+{
-+	struct au_finfo *finfo = _finfo;
-+	static struct lock_class_key aufs_fi;
-+
-+	au_rw_init(&finfo->fi_rwsem);
-+	au_rw_class(&finfo->fi_rwsem, &aufs_fi);
-+}
-+
-+int au_finfo_init(struct file *file, struct au_fidir *fidir)
-+{
-+	int err;
-+	struct au_finfo *finfo;
-+	struct dentry *dentry;
-+
-+	err = -ENOMEM;
-+	dentry = file->f_path.dentry;
-+	finfo = au_cache_alloc_finfo();
-+	if (unlikely(!finfo))
-+		goto out;
-+
-+	err = 0;
-+	au_nfiles_inc(dentry->d_sb);
-+	/* verbose coding for lock class name */
-+	if (!fidir)
-+		au_rw_class(&finfo->fi_rwsem, au_lc_key + AuLcNonDir_FIINFO);
-+	else
-+		au_rw_class(&finfo->fi_rwsem, au_lc_key + AuLcDir_FIINFO);
-+	au_rw_write_lock(&finfo->fi_rwsem);
-+	finfo->fi_btop = -1;
-+	finfo->fi_hdir = fidir;
-+	atomic_set(&finfo->fi_generation, au_digen(dentry));
-+	/* smp_mb(); */ /* atomic_set */
-+
-+	file->private_data = finfo;
-+
-+out:
-+	return err;
-+}
-diff -Nur linux-4.1.10.orig/fs/aufs/f_op.c linux-4.1.10/fs/aufs/f_op.c
---- linux-4.1.10.orig/fs/aufs/f_op.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/f_op.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,738 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * file and vm operations
-+ */
-+
-+#include <linux/aio.h>
-+#include <linux/fs_stack.h>
-+#include <linux/mman.h>
-+#include <linux/security.h>
-+#include "aufs.h"
-+
-+int au_do_open_nondir(struct file *file, int flags, struct file *h_file)
-+{
-+	int err;
-+	aufs_bindex_t bindex;
-+	struct dentry *dentry;
-+	struct au_finfo *finfo;
-+	struct inode *h_inode;
-+
-+	FiMustWriteLock(file);
-+
-+	err = 0;
-+	dentry = file->f_path.dentry;
-+	AuDebugOn(IS_ERR_OR_NULL(dentry));
-+	finfo = au_fi(file);
-+	memset(&finfo->fi_htop, 0, sizeof(finfo->fi_htop));
-+	atomic_set(&finfo->fi_mmapped, 0);
-+	bindex = au_dbstart(dentry);
-+	if (!h_file)
-+		h_file = au_h_open(dentry, bindex, flags, file, /*force_wr*/0);
-+	else
-+		get_file(h_file);
-+	if (IS_ERR(h_file))
-+		err = PTR_ERR(h_file);
-+	else {
-+		if ((flags & __O_TMPFILE)
-+		    && !(flags & O_EXCL)) {
-+			h_inode = file_inode(h_file);
-+			spin_lock(&h_inode->i_lock);
-+			h_inode->i_state |= I_LINKABLE;
-+			spin_unlock(&h_inode->i_lock);
-+		}
-+		au_set_fbstart(file, bindex);
-+		au_set_h_fptr(file, bindex, h_file);
-+		au_update_figen(file);
-+		/* todo: necessary? */
-+		/* file->f_ra = h_file->f_ra; */
-+	}
-+
-+	return err;
-+}
-+
-+static int aufs_open_nondir(struct inode *inode __maybe_unused,
-+			    struct file *file)
-+{
-+	int err;
-+	struct super_block *sb;
-+	struct au_do_open_args args = {
-+		.open	= au_do_open_nondir
-+	};
-+
-+	AuDbg("%pD, f_flags 0x%x, f_mode 0x%x\n",
-+	      file, vfsub_file_flags(file), file->f_mode);
-+
-+	sb = file->f_path.dentry->d_sb;
-+	si_read_lock(sb, AuLock_FLUSH);
-+	err = au_do_open(file, &args);
-+	si_read_unlock(sb);
-+	return err;
-+}
-+
-+int aufs_release_nondir(struct inode *inode __maybe_unused, struct file *file)
-+{
-+	struct au_finfo *finfo;
-+	aufs_bindex_t bindex;
-+
-+	finfo = au_fi(file);
-+	au_sphl_del(&finfo->fi_hlist,
-+		    &au_sbi(file->f_path.dentry->d_sb)->si_files);
-+	bindex = finfo->fi_btop;
-+	if (bindex >= 0)
-+		au_set_h_fptr(file, bindex, NULL);
-+
-+	au_finfo_fin(file);
-+	return 0;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static int au_do_flush_nondir(struct file *file, fl_owner_t id)
-+{
-+	int err;
-+	struct file *h_file;
-+
-+	err = 0;
-+	h_file = au_hf_top(file);
-+	if (h_file)
-+		err = vfsub_flush(h_file, id);
-+	return err;
-+}
-+
-+static int aufs_flush_nondir(struct file *file, fl_owner_t id)
-+{
-+	return au_do_flush(file, id, au_do_flush_nondir);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+/*
-+ * read and write functions acquire [fdi]_rwsem once, but release before
-+ * mmap_sem. This is because to stop a race condition between mmap(2).
-+ * Releasing these aufs-rwsem should be safe, no branch-mamagement (by keeping
-+ * si_rwsem), no harmful copy-up should happen. Actually copy-up may happen in
-+ * read functions after [fdi]_rwsem are released, but it should be harmless.
-+ */
-+
-+/* Callers should call au_read_post() or fput() in the end */
-+struct file *au_read_pre(struct file *file, int keep_fi)
-+{
-+	struct file *h_file;
-+	int err;
-+
-+	err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/0);
-+	if (!err) {
-+		di_read_unlock(file->f_path.dentry, AuLock_IR);
-+		h_file = au_hf_top(file);
-+		get_file(h_file);
-+		if (!keep_fi)
-+			fi_read_unlock(file);
-+	} else
-+		h_file = ERR_PTR(err);
-+
-+	return h_file;
-+}
-+
-+static void au_read_post(struct inode *inode, struct file *h_file)
-+{
-+	/* update without lock, I don't think it a problem */
-+	fsstack_copy_attr_atime(inode, file_inode(h_file));
-+	fput(h_file);
-+}
-+
-+struct au_write_pre {
-+	blkcnt_t blks;
-+	aufs_bindex_t bstart;
-+};
-+
-+/*
-+ * return with iinfo is write-locked
-+ * callers should call au_write_post() or iinfo_write_unlock() + fput() in the
-+ * end
-+ */
-+static struct file *au_write_pre(struct file *file, int do_ready,
-+				 struct au_write_pre *wpre)
-+{
-+	struct file *h_file;
-+	struct dentry *dentry;
-+	int err;
-+	struct au_pin pin;
-+
-+	err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1);
-+	h_file = ERR_PTR(err);
-+	if (unlikely(err))
-+		goto out;
-+
-+	dentry = file->f_path.dentry;
-+	if (do_ready) {
-+		err = au_ready_to_write(file, -1, &pin);
-+		if (unlikely(err)) {
-+			h_file = ERR_PTR(err);
-+			di_write_unlock(dentry);
-+			goto out_fi;
-+		}
-+	}
-+
-+	di_downgrade_lock(dentry, /*flags*/0);
-+	if (wpre)
-+		wpre->bstart = au_fbstart(file);
-+	h_file = au_hf_top(file);
-+	get_file(h_file);
-+	if (wpre)
-+		wpre->blks = file_inode(h_file)->i_blocks;
-+	if (do_ready)
-+		au_unpin(&pin);
-+	di_read_unlock(dentry, /*flags*/0);
-+
-+out_fi:
-+	fi_write_unlock(file);
-+out:
-+	return h_file;
-+}
-+
-+static void au_write_post(struct inode *inode, struct file *h_file,
-+			  struct au_write_pre *wpre, ssize_t written)
-+{
-+	struct inode *h_inode;
-+
-+	au_cpup_attr_timesizes(inode);
-+	AuDebugOn(au_ibstart(inode) != wpre->bstart);
-+	h_inode = file_inode(h_file);
-+	inode->i_mode = h_inode->i_mode;
-+	ii_write_unlock(inode);
-+	fput(h_file);
-+
-+	/* AuDbg("blks %llu, %llu\n", (u64)blks, (u64)h_inode->i_blocks); */
-+	if (written > 0)
-+		au_fhsm_wrote(inode->i_sb, wpre->bstart,
-+			      /*force*/h_inode->i_blocks > wpre->blks);
-+}
-+
-+static ssize_t aufs_read(struct file *file, char __user *buf, size_t count,
-+			 loff_t *ppos)
-+{
-+	ssize_t err;
-+	struct inode *inode;
-+	struct file *h_file;
-+	struct super_block *sb;
-+
-+	inode = file_inode(file);
-+	sb = inode->i_sb;
-+	si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW);
-+
-+	h_file = au_read_pre(file, /*keep_fi*/0);
-+	err = PTR_ERR(h_file);
-+	if (IS_ERR(h_file))
-+		goto out;
-+
-+	/* filedata may be obsoleted by concurrent copyup, but no problem */
-+	err = vfsub_read_u(h_file, buf, count, ppos);
-+	/* todo: necessary? */
-+	/* file->f_ra = h_file->f_ra; */
-+	au_read_post(inode, h_file);
-+
-+out:
-+	si_read_unlock(sb);
-+	return err;
-+}
-+
-+/*
-+ * todo: very ugly
-+ * it locks both of i_mutex and si_rwsem for read in safe.
-+ * if the plink maintenance mode continues forever (that is the problem),
-+ * may loop forever.
-+ */
-+static void au_mtx_and_read_lock(struct inode *inode)
-+{
-+	int err;
-+	struct super_block *sb = inode->i_sb;
-+
-+	while (1) {
-+		mutex_lock(&inode->i_mutex);
-+		err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM);
-+		if (!err)
-+			break;
-+		mutex_unlock(&inode->i_mutex);
-+		si_read_lock(sb, AuLock_NOPLMW);
-+		si_read_unlock(sb);
-+	}
-+}
-+
-+static ssize_t aufs_write(struct file *file, const char __user *ubuf,
-+			  size_t count, loff_t *ppos)
-+{
-+	ssize_t err;
-+	struct au_write_pre wpre;
-+	struct inode *inode;
-+	struct file *h_file;
-+	char __user *buf = (char __user *)ubuf;
-+
-+	inode = file_inode(file);
-+	au_mtx_and_read_lock(inode);
-+
-+	h_file = au_write_pre(file, /*do_ready*/1, &wpre);
-+	err = PTR_ERR(h_file);
-+	if (IS_ERR(h_file))
-+		goto out;
-+
-+	err = vfsub_write_u(h_file, buf, count, ppos);
-+	au_write_post(inode, h_file, &wpre, err);
-+
-+out:
-+	si_read_unlock(inode->i_sb);
-+	mutex_unlock(&inode->i_mutex);
-+	return err;
-+}
-+
-+static ssize_t au_do_iter(struct file *h_file, int rw, struct kiocb *kio,
-+			  struct iov_iter *iov_iter)
-+{
-+	ssize_t err;
-+	struct file *file;
-+	ssize_t (*iter)(struct kiocb *, struct iov_iter *);
-+
-+	err = security_file_permission(h_file, rw);
-+	if (unlikely(err))
-+		goto out;
-+
-+	err = -ENOSYS;
-+	iter = NULL;
-+	if (rw == MAY_READ)
-+		iter = h_file->f_op->read_iter;
-+	else if (rw == MAY_WRITE)
-+		iter = h_file->f_op->write_iter;
-+
-+	file = kio->ki_filp;
-+	kio->ki_filp = h_file;
-+	if (iter) {
-+		lockdep_off();
-+		err = iter(kio, iov_iter);
-+		lockdep_on();
-+	} else
-+		/* currently there is no such fs */
-+		WARN_ON_ONCE(1);
-+	kio->ki_filp = file;
-+
-+out:
-+	return err;
-+}
-+
-+static ssize_t aufs_read_iter(struct kiocb *kio, struct iov_iter *iov_iter)
-+{
-+	ssize_t err;
-+	struct file *file, *h_file;
-+	struct inode *inode;
-+	struct super_block *sb;
-+
-+	file = kio->ki_filp;
-+	inode = file_inode(file);
-+	sb = inode->i_sb;
-+	si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW);
-+
-+	h_file = au_read_pre(file, /*keep_fi*/0);
-+	err = PTR_ERR(h_file);
-+	if (IS_ERR(h_file))
-+		goto out;
-+
-+	err = au_do_iter(h_file, MAY_READ, kio, iov_iter);
-+	/* todo: necessary? */
-+	/* file->f_ra = h_file->f_ra; */
-+	au_read_post(inode, h_file);
-+
-+out:
-+	si_read_unlock(sb);
-+	return err;
-+}
-+
-+static ssize_t aufs_write_iter(struct kiocb *kio, struct iov_iter *iov_iter)
-+{
-+	ssize_t err;
-+	struct au_write_pre wpre;
-+	struct inode *inode;
-+	struct file *file, *h_file;
-+
-+	file = kio->ki_filp;
-+	inode = file_inode(file);
-+	au_mtx_and_read_lock(inode);
-+
-+	h_file = au_write_pre(file, /*do_ready*/1, &wpre);
-+	err = PTR_ERR(h_file);
-+	if (IS_ERR(h_file))
-+		goto out;
-+
-+	err = au_do_iter(h_file, MAY_WRITE, kio, iov_iter);
-+	au_write_post(inode, h_file, &wpre, err);
-+
-+out:
-+	si_read_unlock(inode->i_sb);
-+	mutex_unlock(&inode->i_mutex);
-+	return err;
-+}
-+
-+static ssize_t aufs_splice_read(struct file *file, loff_t *ppos,
-+				struct pipe_inode_info *pipe, size_t len,
-+				unsigned int flags)
-+{
-+	ssize_t err;
-+	struct file *h_file;
-+	struct inode *inode;
-+	struct super_block *sb;
-+
-+	inode = file_inode(file);
-+	sb = inode->i_sb;
-+	si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW);
-+
-+	h_file = au_read_pre(file, /*keep_fi*/1);
-+	err = PTR_ERR(h_file);
-+	if (IS_ERR(h_file))
-+		goto out;
-+
-+	if (au_test_loopback_kthread()) {
-+		au_warn_loopback(h_file->f_path.dentry->d_sb);
-+		if (file->f_mapping != h_file->f_mapping) {
-+			file->f_mapping = h_file->f_mapping;
-+			smp_mb(); /* unnecessary? */
-+		}
-+	}
-+	fi_read_unlock(file);
-+
-+	err = vfsub_splice_to(h_file, ppos, pipe, len, flags);
-+	/* todo: necessasry? */
-+	/* file->f_ra = h_file->f_ra; */
-+	au_read_post(inode, h_file);
-+
-+out:
-+	si_read_unlock(sb);
-+	return err;
-+}
-+
-+static ssize_t
-+aufs_splice_write(struct pipe_inode_info *pipe, struct file *file, loff_t *ppos,
-+		  size_t len, unsigned int flags)
-+{
-+	ssize_t err;
-+	struct au_write_pre wpre;
-+	struct inode *inode;
-+	struct file *h_file;
-+
-+	inode = file_inode(file);
-+	au_mtx_and_read_lock(inode);
-+
-+	h_file = au_write_pre(file, /*do_ready*/1, &wpre);
-+	err = PTR_ERR(h_file);
-+	if (IS_ERR(h_file))
-+		goto out;
-+
-+	err = vfsub_splice_from(pipe, h_file, ppos, len, flags);
-+	au_write_post(inode, h_file, &wpre, err);
-+
-+out:
-+	si_read_unlock(inode->i_sb);
-+	mutex_unlock(&inode->i_mutex);
-+	return err;
-+}
-+
-+static long aufs_fallocate(struct file *file, int mode, loff_t offset,
-+			   loff_t len)
-+{
-+	long err;
-+	struct au_write_pre wpre;
-+	struct inode *inode;
-+	struct file *h_file;
-+
-+	inode = file_inode(file);
-+	au_mtx_and_read_lock(inode);
-+
-+	h_file = au_write_pre(file, /*do_ready*/1, &wpre);
-+	err = PTR_ERR(h_file);
-+	if (IS_ERR(h_file))
-+		goto out;
-+
-+	lockdep_off();
-+	err = vfs_fallocate(h_file, mode, offset, len);
-+	lockdep_on();
-+	au_write_post(inode, h_file, &wpre, /*written*/1);
-+
-+out:
-+	si_read_unlock(inode->i_sb);
-+	mutex_unlock(&inode->i_mutex);
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/*
-+ * The locking order around current->mmap_sem.
-+ * - in most and regular cases
-+ *   file I/O syscall -- aufs_read() or something
-+ *	-- si_rwsem for read -- mmap_sem
-+ *	(Note that [fdi]i_rwsem are released before mmap_sem).
-+ * - in mmap case
-+ *   mmap(2) -- mmap_sem -- aufs_mmap() -- si_rwsem for read -- [fdi]i_rwsem
-+ * This AB-BA order is definitly bad, but is not a problem since "si_rwsem for
-+ * read" allows muliple processes to acquire it and [fdi]i_rwsem are not held in
-+ * file I/O. Aufs needs to stop lockdep in aufs_mmap() though.
-+ * It means that when aufs acquires si_rwsem for write, the process should never
-+ * acquire mmap_sem.
-+ *
-+ * Actually aufs_iterate() holds [fdi]i_rwsem before mmap_sem, but this is not a
-+ * problem either since any directory is not able to be mmap-ed.
-+ * The similar scenario is applied to aufs_readlink() too.
-+ */
-+
-+#if 0 /* stop calling security_file_mmap() */
-+/* cf. linux/include/linux/mman.h: calc_vm_prot_bits() */
-+#define AuConv_VM_PROT(f, b)	_calc_vm_trans(f, VM_##b, PROT_##b)
-+
-+static unsigned long au_arch_prot_conv(unsigned long flags)
-+{
-+	/* currently ppc64 only */
-+#ifdef CONFIG_PPC64
-+	/* cf. linux/arch/powerpc/include/asm/mman.h */
-+	AuDebugOn(arch_calc_vm_prot_bits(-1) != VM_SAO);
-+	return AuConv_VM_PROT(flags, SAO);
-+#else
-+	AuDebugOn(arch_calc_vm_prot_bits(-1));
-+	return 0;
-+#endif
-+}
-+
-+static unsigned long au_prot_conv(unsigned long flags)
-+{
-+	return AuConv_VM_PROT(flags, READ)
-+		| AuConv_VM_PROT(flags, WRITE)
-+		| AuConv_VM_PROT(flags, EXEC)
-+		| au_arch_prot_conv(flags);
-+}
-+
-+/* cf. linux/include/linux/mman.h: calc_vm_flag_bits() */
-+#define AuConv_VM_MAP(f, b)	_calc_vm_trans(f, VM_##b, MAP_##b)
-+
-+static unsigned long au_flag_conv(unsigned long flags)
-+{
-+	return AuConv_VM_MAP(flags, GROWSDOWN)
-+		| AuConv_VM_MAP(flags, DENYWRITE)
-+		| AuConv_VM_MAP(flags, LOCKED);
-+}
-+#endif
-+
-+static int aufs_mmap(struct file *file, struct vm_area_struct *vma)
-+{
-+	int err;
-+	const unsigned char wlock
-+		= (file->f_mode & FMODE_WRITE) && (vma->vm_flags & VM_SHARED);
-+	struct super_block *sb;
-+	struct file *h_file;
-+	struct inode *inode;
-+
-+	AuDbgVmRegion(file, vma);
-+
-+	inode = file_inode(file);
-+	sb = inode->i_sb;
-+	lockdep_off();
-+	si_read_lock(sb, AuLock_NOPLMW);
-+
-+	h_file = au_write_pre(file, wlock, /*wpre*/NULL);
-+	lockdep_on();
-+	err = PTR_ERR(h_file);
-+	if (IS_ERR(h_file))
-+		goto out;
-+
-+	err = 0;
-+	au_set_mmapped(file);
-+	au_vm_file_reset(vma, h_file);
-+	/*
-+	 * we cannot call security_mmap_file() here since it may acquire
-+	 * mmap_sem or i_mutex.
-+	 *
-+	 * err = security_mmap_file(h_file, au_prot_conv(vma->vm_flags),
-+	 *			 au_flag_conv(vma->vm_flags));
-+	 */
-+	if (!err)
-+		err = h_file->f_op->mmap(h_file, vma);
-+	if (!err) {
-+		au_vm_prfile_set(vma, file);
-+		fsstack_copy_attr_atime(inode, file_inode(h_file));
-+		goto out_fput; /* success */
-+	}
-+	au_unset_mmapped(file);
-+	au_vm_file_reset(vma, file);
-+
-+out_fput:
-+	lockdep_off();
-+	ii_write_unlock(inode);
-+	lockdep_on();
-+	fput(h_file);
-+out:
-+	lockdep_off();
-+	si_read_unlock(sb);
-+	lockdep_on();
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static int aufs_fsync_nondir(struct file *file, loff_t start, loff_t end,
-+			     int datasync)
-+{
-+	int err;
-+	struct au_write_pre wpre;
-+	struct inode *inode;
-+	struct file *h_file;
-+
-+	err = 0; /* -EBADF; */ /* posix? */
-+	if (unlikely(!(file->f_mode & FMODE_WRITE)))
-+		goto out;
-+
-+	inode = file_inode(file);
-+	au_mtx_and_read_lock(inode);
-+
-+	h_file = au_write_pre(file, /*do_ready*/1, &wpre);
-+	err = PTR_ERR(h_file);
-+	if (IS_ERR(h_file))
-+		goto out_unlock;
-+
-+	err = vfsub_fsync(h_file, &h_file->f_path, datasync);
-+	au_write_post(inode, h_file, &wpre, /*written*/0);
-+
-+out_unlock:
-+	si_read_unlock(inode->i_sb);
-+	mutex_unlock(&inode->i_mutex);
-+out:
-+	return err;
-+}
-+
-+/* no one supports this operation, currently */
-+#if 0
-+static int aufs_aio_fsync_nondir(struct kiocb *kio, int datasync)
-+{
-+	int err;
-+	struct au_write_pre wpre;
-+	struct inode *inode;
-+	struct file *file, *h_file;
-+
-+	err = 0; /* -EBADF; */ /* posix? */
-+	if (unlikely(!(file->f_mode & FMODE_WRITE)))
-+		goto out;
-+
-+	file = kio->ki_filp;
-+	inode = file_inode(file);
-+	au_mtx_and_read_lock(inode);
-+
-+	h_file = au_write_pre(file, /*do_ready*/1, &wpre);
-+	err = PTR_ERR(h_file);
-+	if (IS_ERR(h_file))
-+		goto out_unlock;
-+
-+	err = -ENOSYS;
-+	h_file = au_hf_top(file);
-+	if (h_file->f_op->aio_fsync) {
-+		struct mutex *h_mtx;
-+
-+		h_mtx = &file_inode(h_file)->i_mutex;
-+		if (!is_sync_kiocb(kio)) {
-+			get_file(h_file);
-+			fput(file);
-+		}
-+		kio->ki_filp = h_file;
-+		err = h_file->f_op->aio_fsync(kio, datasync);
-+		mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
-+		if (!err)
-+			vfsub_update_h_iattr(&h_file->f_path, /*did*/NULL);
-+		/*ignore*/
-+		mutex_unlock(h_mtx);
-+	}
-+	au_write_post(inode, h_file, &wpre, /*written*/0);
-+
-+out_unlock:
-+	si_read_unlock(inode->sb);
-+	mutex_unlock(&inode->i_mutex);
-+out:
-+	return err;
-+}
-+#endif
-+
-+static int aufs_fasync(int fd, struct file *file, int flag)
-+{
-+	int err;
-+	struct file *h_file;
-+	struct super_block *sb;
-+
-+	sb = file->f_path.dentry->d_sb;
-+	si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW);
-+
-+	h_file = au_read_pre(file, /*keep_fi*/0);
-+	err = PTR_ERR(h_file);
-+	if (IS_ERR(h_file))
-+		goto out;
-+
-+	if (h_file->f_op->fasync)
-+		err = h_file->f_op->fasync(fd, h_file, flag);
-+	fput(h_file); /* instead of au_read_post() */
-+
-+out:
-+	si_read_unlock(sb);
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* no one supports this operation, currently */
-+#if 0
-+static ssize_t aufs_sendpage(struct file *file, struct page *page, int offset,
-+			     size_t len, loff_t *pos, int more)
-+{
-+}
-+#endif
-+
-+/* ---------------------------------------------------------------------- */
-+
-+const struct file_operations aufs_file_fop = {
-+	.owner		= THIS_MODULE,
-+
-+	.llseek		= default_llseek,
-+
-+	.read		= aufs_read,
-+	.write		= aufs_write,
-+	.read_iter	= aufs_read_iter,
-+	.write_iter	= aufs_write_iter,
-+
-+#ifdef CONFIG_AUFS_POLL
-+	.poll		= aufs_poll,
-+#endif
-+	.unlocked_ioctl	= aufs_ioctl_nondir,
-+#ifdef CONFIG_COMPAT
-+	.compat_ioctl	= aufs_compat_ioctl_nondir,
-+#endif
-+	.mmap		= aufs_mmap,
-+	.open		= aufs_open_nondir,
-+	.flush		= aufs_flush_nondir,
-+	.release	= aufs_release_nondir,
-+	.fsync		= aufs_fsync_nondir,
-+	/* .aio_fsync	= aufs_aio_fsync_nondir, */
-+	.fasync		= aufs_fasync,
-+	/* .sendpage	= aufs_sendpage, */
-+	.splice_write	= aufs_splice_write,
-+	.splice_read	= aufs_splice_read,
-+#if 0
-+	.aio_splice_write = aufs_aio_splice_write,
-+	.aio_splice_read  = aufs_aio_splice_read,
-+#endif
-+	.fallocate	= aufs_fallocate
-+};
-diff -Nur linux-4.1.10.orig/fs/aufs/fstype.h linux-4.1.10/fs/aufs/fstype.h
---- linux-4.1.10.orig/fs/aufs/fstype.h	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/fstype.h	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,400 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * judging filesystem type
-+ */
-+
-+#ifndef __AUFS_FSTYPE_H__
-+#define __AUFS_FSTYPE_H__
-+
-+#ifdef __KERNEL__
-+
-+#include <linux/fs.h>
-+#include <linux/magic.h>
-+#include <linux/romfs_fs.h>
-+#include <linux/nfs_fs.h>
-+
-+static inline int au_test_aufs(struct super_block *sb)
-+{
-+	return sb->s_magic == AUFS_SUPER_MAGIC;
-+}
-+
-+static inline const char *au_sbtype(struct super_block *sb)
-+{
-+	return sb->s_type->name;
-+}
-+
-+static inline int au_test_iso9660(struct super_block *sb __maybe_unused)
-+{
-+#if defined(CONFIG_ISO9660_FS) || defined(CONFIG_ISO9660_FS_MODULE)
-+	return sb->s_magic == ISOFS_SUPER_MAGIC;
-+#else
-+	return 0;
-+#endif
-+}
-+
-+static inline int au_test_romfs(struct super_block *sb __maybe_unused)
-+{
-+#if defined(CONFIG_ROMFS_FS) || defined(CONFIG_ROMFS_FS_MODULE)
-+	return sb->s_magic == ROMFS_MAGIC;
-+#else
-+	return 0;
-+#endif
-+}
-+
-+static inline int au_test_cramfs(struct super_block *sb __maybe_unused)
-+{
-+#if defined(CONFIG_CRAMFS) || defined(CONFIG_CRAMFS_MODULE)
-+	return sb->s_magic == CRAMFS_MAGIC;
-+#endif
-+	return 0;
-+}
-+
-+static inline int au_test_nfs(struct super_block *sb __maybe_unused)
-+{
-+#if defined(CONFIG_NFS_FS) || defined(CONFIG_NFS_FS_MODULE)
-+	return sb->s_magic == NFS_SUPER_MAGIC;
-+#else
-+	return 0;
-+#endif
-+}
-+
-+static inline int au_test_fuse(struct super_block *sb __maybe_unused)
-+{
-+#if defined(CONFIG_FUSE_FS) || defined(CONFIG_FUSE_FS_MODULE)
-+	return sb->s_magic == FUSE_SUPER_MAGIC;
-+#else
-+	return 0;
-+#endif
-+}
-+
-+static inline int au_test_xfs(struct super_block *sb __maybe_unused)
-+{
-+#if defined(CONFIG_XFS_FS) || defined(CONFIG_XFS_FS_MODULE)
-+	return sb->s_magic == XFS_SB_MAGIC;
-+#else
-+	return 0;
-+#endif
-+}
-+
-+static inline int au_test_tmpfs(struct super_block *sb __maybe_unused)
-+{
-+#ifdef CONFIG_TMPFS
-+	return sb->s_magic == TMPFS_MAGIC;
-+#else
-+	return 0;
-+#endif
-+}
-+
-+static inline int au_test_ecryptfs(struct super_block *sb __maybe_unused)
-+{
-+#if defined(CONFIG_ECRYPT_FS) || defined(CONFIG_ECRYPT_FS_MODULE)
-+	return !strcmp(au_sbtype(sb), "ecryptfs");
-+#else
-+	return 0;
-+#endif
-+}
-+
-+static inline int au_test_ramfs(struct super_block *sb)
-+{
-+	return sb->s_magic == RAMFS_MAGIC;
-+}
-+
-+static inline int au_test_ubifs(struct super_block *sb __maybe_unused)
-+{
-+#if defined(CONFIG_UBIFS_FS) || defined(CONFIG_UBIFS_FS_MODULE)
-+	return sb->s_magic == UBIFS_SUPER_MAGIC;
-+#else
-+	return 0;
-+#endif
-+}
-+
-+static inline int au_test_procfs(struct super_block *sb __maybe_unused)
-+{
-+#ifdef CONFIG_PROC_FS
-+	return sb->s_magic == PROC_SUPER_MAGIC;
-+#else
-+	return 0;
-+#endif
-+}
-+
-+static inline int au_test_sysfs(struct super_block *sb __maybe_unused)
-+{
-+#ifdef CONFIG_SYSFS
-+	return sb->s_magic == SYSFS_MAGIC;
-+#else
-+	return 0;
-+#endif
-+}
-+
-+static inline int au_test_configfs(struct super_block *sb __maybe_unused)
-+{
-+#if defined(CONFIG_CONFIGFS_FS) || defined(CONFIG_CONFIGFS_FS_MODULE)
-+	return sb->s_magic == CONFIGFS_MAGIC;
-+#else
-+	return 0;
-+#endif
-+}
-+
-+static inline int au_test_minix(struct super_block *sb __maybe_unused)
-+{
-+#if defined(CONFIG_MINIX_FS) || defined(CONFIG_MINIX_FS_MODULE)
-+	return sb->s_magic == MINIX3_SUPER_MAGIC
-+		|| sb->s_magic == MINIX2_SUPER_MAGIC
-+		|| sb->s_magic == MINIX2_SUPER_MAGIC2
-+		|| sb->s_magic == MINIX_SUPER_MAGIC
-+		|| sb->s_magic == MINIX_SUPER_MAGIC2;
-+#else
-+	return 0;
-+#endif
-+}
-+
-+static inline int au_test_fat(struct super_block *sb __maybe_unused)
-+{
-+#if defined(CONFIG_FAT_FS) || defined(CONFIG_FAT_FS_MODULE)
-+	return sb->s_magic == MSDOS_SUPER_MAGIC;
-+#else
-+	return 0;
-+#endif
-+}
-+
-+static inline int au_test_msdos(struct super_block *sb)
-+{
-+	return au_test_fat(sb);
-+}
-+
-+static inline int au_test_vfat(struct super_block *sb)
-+{
-+	return au_test_fat(sb);
-+}
-+
-+static inline int au_test_securityfs(struct super_block *sb __maybe_unused)
-+{
-+#ifdef CONFIG_SECURITYFS
-+	return sb->s_magic == SECURITYFS_MAGIC;
-+#else
-+	return 0;
-+#endif
-+}
-+
-+static inline int au_test_squashfs(struct super_block *sb __maybe_unused)
-+{
-+#if defined(CONFIG_SQUASHFS) || defined(CONFIG_SQUASHFS_MODULE)
-+	return sb->s_magic == SQUASHFS_MAGIC;
-+#else
-+	return 0;
-+#endif
-+}
-+
-+static inline int au_test_btrfs(struct super_block *sb __maybe_unused)
-+{
-+#if defined(CONFIG_BTRFS_FS) || defined(CONFIG_BTRFS_FS_MODULE)
-+	return sb->s_magic == BTRFS_SUPER_MAGIC;
-+#else
-+	return 0;
-+#endif
-+}
-+
-+static inline int au_test_xenfs(struct super_block *sb __maybe_unused)
-+{
-+#if defined(CONFIG_XENFS) || defined(CONFIG_XENFS_MODULE)
-+	return sb->s_magic == XENFS_SUPER_MAGIC;
-+#else
-+	return 0;
-+#endif
-+}
-+
-+static inline int au_test_debugfs(struct super_block *sb __maybe_unused)
-+{
-+#ifdef CONFIG_DEBUG_FS
-+	return sb->s_magic == DEBUGFS_MAGIC;
-+#else
-+	return 0;
-+#endif
-+}
-+
-+static inline int au_test_nilfs(struct super_block *sb __maybe_unused)
-+{
-+#if defined(CONFIG_NILFS) || defined(CONFIG_NILFS_MODULE)
-+	return sb->s_magic == NILFS_SUPER_MAGIC;
-+#else
-+	return 0;
-+#endif
-+}
-+
-+static inline int au_test_hfsplus(struct super_block *sb __maybe_unused)
-+{
-+#if defined(CONFIG_HFSPLUS_FS) || defined(CONFIG_HFSPLUS_FS_MODULE)
-+	return sb->s_magic == HFSPLUS_SUPER_MAGIC;
-+#else
-+	return 0;
-+#endif
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+/*
-+ * they can't be an aufs branch.
-+ */
-+static inline int au_test_fs_unsuppoted(struct super_block *sb)
-+{
-+	return
-+#ifndef CONFIG_AUFS_BR_RAMFS
-+		au_test_ramfs(sb) ||
-+#endif
-+		au_test_procfs(sb)
-+		|| au_test_sysfs(sb)
-+		|| au_test_configfs(sb)
-+		|| au_test_debugfs(sb)
-+		|| au_test_securityfs(sb)
-+		|| au_test_xenfs(sb)
-+		|| au_test_ecryptfs(sb)
-+		/* || !strcmp(au_sbtype(sb), "unionfs") */
-+		|| au_test_aufs(sb); /* will be supported in next version */
-+}
-+
-+static inline int au_test_fs_remote(struct super_block *sb)
-+{
-+	return !au_test_tmpfs(sb)
-+#ifdef CONFIG_AUFS_BR_RAMFS
-+		&& !au_test_ramfs(sb)
-+#endif
-+		&& !(sb->s_type->fs_flags & FS_REQUIRES_DEV);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/*
-+ * Note: these functions (below) are created after reading ->getattr() in all
-+ * filesystems under linux/fs. it means we have to do so in every update...
-+ */
-+
-+/*
-+ * some filesystems require getattr to refresh the inode attributes before
-+ * referencing.
-+ * in most cases, we can rely on the inode attribute in NFS (or every remote fs)
-+ * and leave the work for d_revalidate()
-+ */
-+static inline int au_test_fs_refresh_iattr(struct super_block *sb)
-+{
-+	return au_test_nfs(sb)
-+		|| au_test_fuse(sb)
-+		/* || au_test_btrfs(sb) */	/* untested */
-+		;
-+}
-+
-+/*
-+ * filesystems which don't maintain i_size or i_blocks.
-+ */
-+static inline int au_test_fs_bad_iattr_size(struct super_block *sb)
-+{
-+	return au_test_xfs(sb)
-+		|| au_test_btrfs(sb)
-+		|| au_test_ubifs(sb)
-+		|| au_test_hfsplus(sb)	/* maintained, but incorrect */
-+		/* || au_test_minix(sb) */	/* untested */
-+		;
-+}
-+
-+/*
-+ * filesystems which don't store the correct value in some of their inode
-+ * attributes.
-+ */
-+static inline int au_test_fs_bad_iattr(struct super_block *sb)
-+{
-+	return au_test_fs_bad_iattr_size(sb)
-+		|| au_test_fat(sb)
-+		|| au_test_msdos(sb)
-+		|| au_test_vfat(sb);
-+}
-+
-+/* they don't check i_nlink in link(2) */
-+static inline int au_test_fs_no_limit_nlink(struct super_block *sb)
-+{
-+	return au_test_tmpfs(sb)
-+#ifdef CONFIG_AUFS_BR_RAMFS
-+		|| au_test_ramfs(sb)
-+#endif
-+		|| au_test_ubifs(sb)
-+		|| au_test_hfsplus(sb);
-+}
-+
-+/*
-+ * filesystems which sets S_NOATIME and S_NOCMTIME.
-+ */
-+static inline int au_test_fs_notime(struct super_block *sb)
-+{
-+	return au_test_nfs(sb)
-+		|| au_test_fuse(sb)
-+		|| au_test_ubifs(sb)
-+		;
-+}
-+
-+/* temporary support for i#1 in cramfs */
-+static inline int au_test_fs_unique_ino(struct inode *inode)
-+{
-+	if (au_test_cramfs(inode->i_sb))
-+		return inode->i_ino != 1;
-+	return 1;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/*
-+ * the filesystem where the xino files placed must support i/o after unlink and
-+ * maintain i_size and i_blocks.
-+ */
-+static inline int au_test_fs_bad_xino(struct super_block *sb)
-+{
-+	return au_test_fs_remote(sb)
-+		|| au_test_fs_bad_iattr_size(sb)
-+		/* don't want unnecessary work for xino */
-+		|| au_test_aufs(sb)
-+		|| au_test_ecryptfs(sb)
-+		|| au_test_nilfs(sb);
-+}
-+
-+static inline int au_test_fs_trunc_xino(struct super_block *sb)
-+{
-+	return au_test_tmpfs(sb)
-+		|| au_test_ramfs(sb);
-+}
-+
-+/*
-+ * test if the @sb is real-readonly.
-+ */
-+static inline int au_test_fs_rr(struct super_block *sb)
-+{
-+	return au_test_squashfs(sb)
-+		|| au_test_iso9660(sb)
-+		|| au_test_cramfs(sb)
-+		|| au_test_romfs(sb);
-+}
-+
-+/*
-+ * test if the @inode is nfs with 'noacl' option
-+ * NFS always sets MS_POSIXACL regardless its mount option 'noacl.'
-+ */
-+static inline int au_test_nfs_noacl(struct inode *inode)
-+{
-+	return au_test_nfs(inode->i_sb)
-+		/* && IS_POSIXACL(inode) */
-+		&& !nfs_server_capable(inode, NFS_CAP_ACLS);
-+}
-+
-+#endif /* __KERNEL__ */
-+#endif /* __AUFS_FSTYPE_H__ */
-diff -Nur linux-4.1.10.orig/fs/aufs/hfsnotify.c linux-4.1.10/fs/aufs/hfsnotify.c
---- linux-4.1.10.orig/fs/aufs/hfsnotify.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/hfsnotify.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,288 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * fsnotify for the lower directories
-+ */
-+
-+#include "aufs.h"
-+
-+/* FS_IN_IGNORED is unnecessary */
-+static const __u32 AuHfsnMask = (FS_MOVED_TO | FS_MOVED_FROM | FS_DELETE
-+				 | FS_CREATE | FS_EVENT_ON_CHILD);
-+static DECLARE_WAIT_QUEUE_HEAD(au_hfsn_wq);
-+static __cacheline_aligned_in_smp atomic64_t au_hfsn_ifree = ATOMIC64_INIT(0);
-+
-+static void au_hfsn_free_mark(struct fsnotify_mark *mark)
-+{
-+	struct au_hnotify *hn = container_of(mark, struct au_hnotify,
-+					     hn_mark);
-+	AuDbg("here\n");
-+	au_cache_free_hnotify(hn);
-+	smp_mb__before_atomic();
-+	if (atomic64_dec_and_test(&au_hfsn_ifree))
-+		wake_up(&au_hfsn_wq);
-+}
-+
-+static int au_hfsn_alloc(struct au_hinode *hinode)
-+{
-+	int err;
-+	struct au_hnotify *hn;
-+	struct super_block *sb;
-+	struct au_branch *br;
-+	struct fsnotify_mark *mark;
-+	aufs_bindex_t bindex;
-+
-+	hn = hinode->hi_notify;
-+	sb = hn->hn_aufs_inode->i_sb;
-+	bindex = au_br_index(sb, hinode->hi_id);
-+	br = au_sbr(sb, bindex);
-+	AuDebugOn(!br->br_hfsn);
-+
-+	mark = &hn->hn_mark;
-+	fsnotify_init_mark(mark, au_hfsn_free_mark);
-+	mark->mask = AuHfsnMask;
-+	/*
-+	 * by udba rename or rmdir, aufs assign a new inode to the known
-+	 * h_inode, so specify 1 to allow dups.
-+	 */
-+	lockdep_off();
-+	err = fsnotify_add_mark(mark, br->br_hfsn->hfsn_group, hinode->hi_inode,
-+				 /*mnt*/NULL, /*allow_dups*/1);
-+	/* even if err */
-+	fsnotify_put_mark(mark);
-+	lockdep_on();
-+
-+	return err;
-+}
-+
-+static int au_hfsn_free(struct au_hinode *hinode, struct au_hnotify *hn)
-+{
-+	struct fsnotify_mark *mark;
-+	unsigned long long ull;
-+	struct fsnotify_group *group;
-+
-+	ull = atomic64_inc_return(&au_hfsn_ifree);
-+	BUG_ON(!ull);
-+
-+	mark = &hn->hn_mark;
-+	spin_lock(&mark->lock);
-+	group = mark->group;
-+	fsnotify_get_group(group);
-+	spin_unlock(&mark->lock);
-+	lockdep_off();
-+	fsnotify_destroy_mark(mark, group);
-+	fsnotify_put_group(group);
-+	lockdep_on();
-+
-+	/* free hn by myself */
-+	return 0;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static void au_hfsn_ctl(struct au_hinode *hinode, int do_set)
-+{
-+	struct fsnotify_mark *mark;
-+
-+	mark = &hinode->hi_notify->hn_mark;
-+	spin_lock(&mark->lock);
-+	if (do_set) {
-+		AuDebugOn(mark->mask & AuHfsnMask);
-+		mark->mask |= AuHfsnMask;
-+	} else {
-+		AuDebugOn(!(mark->mask & AuHfsnMask));
-+		mark->mask &= ~AuHfsnMask;
-+	}
-+	spin_unlock(&mark->lock);
-+	/* fsnotify_recalc_inode_mask(hinode->hi_inode); */
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* #define AuDbgHnotify */
-+#ifdef AuDbgHnotify
-+static char *au_hfsn_name(u32 mask)
-+{
-+#ifdef CONFIG_AUFS_DEBUG
-+#define test_ret(flag)				\
-+	do {					\
-+		if (mask & flag)		\
-+			return #flag;		\
-+	} while (0)
-+	test_ret(FS_ACCESS);
-+	test_ret(FS_MODIFY);
-+	test_ret(FS_ATTRIB);
-+	test_ret(FS_CLOSE_WRITE);
-+	test_ret(FS_CLOSE_NOWRITE);
-+	test_ret(FS_OPEN);
-+	test_ret(FS_MOVED_FROM);
-+	test_ret(FS_MOVED_TO);
-+	test_ret(FS_CREATE);
-+	test_ret(FS_DELETE);
-+	test_ret(FS_DELETE_SELF);
-+	test_ret(FS_MOVE_SELF);
-+	test_ret(FS_UNMOUNT);
-+	test_ret(FS_Q_OVERFLOW);
-+	test_ret(FS_IN_IGNORED);
-+	test_ret(FS_ISDIR);
-+	test_ret(FS_IN_ONESHOT);
-+	test_ret(FS_EVENT_ON_CHILD);
-+	return "";
-+#undef test_ret
-+#else
-+	return "??";
-+#endif
-+}
-+#endif
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static void au_hfsn_free_group(struct fsnotify_group *group)
-+{
-+	struct au_br_hfsnotify *hfsn = group->private;
-+
-+	AuDbg("here\n");
-+	kfree(hfsn);
-+}
-+
-+static int au_hfsn_handle_event(struct fsnotify_group *group,
-+				struct inode *inode,
-+				struct fsnotify_mark *inode_mark,
-+				struct fsnotify_mark *vfsmount_mark,
-+				u32 mask, void *data, int data_type,
-+				const unsigned char *file_name, u32 cookie)
-+{
-+	int err;
-+	struct au_hnotify *hnotify;
-+	struct inode *h_dir, *h_inode;
-+	struct qstr h_child_qstr = QSTR_INIT(file_name, strlen(file_name));
-+
-+	AuDebugOn(data_type != FSNOTIFY_EVENT_INODE);
-+
-+	err = 0;
-+	/* if FS_UNMOUNT happens, there must be another bug */
-+	AuDebugOn(mask & FS_UNMOUNT);
-+	if (mask & (FS_IN_IGNORED | FS_UNMOUNT))
-+		goto out;
-+
-+	h_dir = inode;
-+	h_inode = NULL;
-+#ifdef AuDbgHnotify
-+	au_debug_on();
-+	if (1 || h_child_qstr.len != sizeof(AUFS_XINO_FNAME) - 1
-+	    || strncmp(h_child_qstr.name, AUFS_XINO_FNAME, h_child_qstr.len)) {
-+		AuDbg("i%lu, mask 0x%x %s, hcname %.*s, hi%lu\n",
-+		      h_dir->i_ino, mask, au_hfsn_name(mask),
-+		      AuLNPair(&h_child_qstr), h_inode ? h_inode->i_ino : 0);
-+		/* WARN_ON(1); */
-+	}
-+	au_debug_off();
-+#endif
-+
-+	AuDebugOn(!inode_mark);
-+	hnotify = container_of(inode_mark, struct au_hnotify, hn_mark);
-+	err = au_hnotify(h_dir, hnotify, mask, &h_child_qstr, h_inode);
-+
-+out:
-+	return err;
-+}
-+
-+static struct fsnotify_ops au_hfsn_ops = {
-+	.handle_event		= au_hfsn_handle_event,
-+	.free_group_priv	= au_hfsn_free_group
-+};
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static void au_hfsn_fin_br(struct au_branch *br)
-+{
-+	struct au_br_hfsnotify *hfsn;
-+
-+	hfsn = br->br_hfsn;
-+	if (hfsn) {
-+		lockdep_off();
-+		fsnotify_put_group(hfsn->hfsn_group);
-+		lockdep_on();
-+	}
-+}
-+
-+static int au_hfsn_init_br(struct au_branch *br, int perm)
-+{
-+	int err;
-+	struct fsnotify_group *group;
-+	struct au_br_hfsnotify *hfsn;
-+
-+	err = 0;
-+	br->br_hfsn = NULL;
-+	if (!au_br_hnotifyable(perm))
-+		goto out;
-+
-+	err = -ENOMEM;
-+	hfsn = kmalloc(sizeof(*hfsn), GFP_NOFS);
-+	if (unlikely(!hfsn))
-+		goto out;
-+
-+	err = 0;
-+	group = fsnotify_alloc_group(&au_hfsn_ops);
-+	if (IS_ERR(group)) {
-+		err = PTR_ERR(group);
-+		pr_err("fsnotify_alloc_group() failed, %d\n", err);
-+		goto out_hfsn;
-+	}
-+
-+	group->private = hfsn;
-+	hfsn->hfsn_group = group;
-+	br->br_hfsn = hfsn;
-+	goto out; /* success */
-+
-+out_hfsn:
-+	kfree(hfsn);
-+out:
-+	return err;
-+}
-+
-+static int au_hfsn_reset_br(unsigned int udba, struct au_branch *br, int perm)
-+{
-+	int err;
-+
-+	err = 0;
-+	if (!br->br_hfsn)
-+		err = au_hfsn_init_br(br, perm);
-+
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static void au_hfsn_fin(void)
-+{
-+	AuDbg("au_hfsn_ifree %lld\n", (long long)atomic64_read(&au_hfsn_ifree));
-+	wait_event(au_hfsn_wq, !atomic64_read(&au_hfsn_ifree));
-+}
-+
-+const struct au_hnotify_op au_hnotify_op = {
-+	.ctl		= au_hfsn_ctl,
-+	.alloc		= au_hfsn_alloc,
-+	.free		= au_hfsn_free,
-+
-+	.fin		= au_hfsn_fin,
-+
-+	.reset_br	= au_hfsn_reset_br,
-+	.fin_br		= au_hfsn_fin_br,
-+	.init_br	= au_hfsn_init_br
-+};
-diff -Nur linux-4.1.10.orig/fs/aufs/hfsplus.c linux-4.1.10/fs/aufs/hfsplus.c
---- linux-4.1.10.orig/fs/aufs/hfsplus.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/hfsplus.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,56 @@
-+/*
-+ * Copyright (C) 2010-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * special support for filesystems which aqucires an inode mutex
-+ * at final closing a file, eg, hfsplus.
-+ *
-+ * This trick is very simple and stupid, just to open the file before really
-+ * neceeary open to tell hfsplus that this is not the final closing.
-+ * The caller should call au_h_open_pre() after acquiring the inode mutex,
-+ * and au_h_open_post() after releasing it.
-+ */
-+
-+#include "aufs.h"
-+
-+struct file *au_h_open_pre(struct dentry *dentry, aufs_bindex_t bindex,
-+			   int force_wr)
-+{
-+	struct file *h_file;
-+	struct dentry *h_dentry;
-+
-+	h_dentry = au_h_dptr(dentry, bindex);
-+	AuDebugOn(!h_dentry);
-+	AuDebugOn(d_is_negative(h_dentry));
-+
-+	h_file = NULL;
-+	if (au_test_hfsplus(h_dentry->d_sb)
-+	    && d_is_reg(h_dentry))
-+		h_file = au_h_open(dentry, bindex,
-+				   O_RDONLY | O_NOATIME | O_LARGEFILE,
-+				   /*file*/NULL, force_wr);
-+	return h_file;
-+}
-+
-+void au_h_open_post(struct dentry *dentry, aufs_bindex_t bindex,
-+		    struct file *h_file)
-+{
-+	if (h_file) {
-+		fput(h_file);
-+		au_sbr_put(dentry->d_sb, bindex);
-+	}
-+}
-diff -Nur linux-4.1.10.orig/fs/aufs/hnotify.c linux-4.1.10/fs/aufs/hnotify.c
---- linux-4.1.10.orig/fs/aufs/hnotify.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/hnotify.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,710 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * abstraction to notify the direct changes on lower directories
-+ */
-+
-+#include "aufs.h"
-+
-+int au_hn_alloc(struct au_hinode *hinode, struct inode *inode)
-+{
-+	int err;
-+	struct au_hnotify *hn;
-+
-+	err = -ENOMEM;
-+	hn = au_cache_alloc_hnotify();
-+	if (hn) {
-+		hn->hn_aufs_inode = inode;
-+		hinode->hi_notify = hn;
-+		err = au_hnotify_op.alloc(hinode);
-+		AuTraceErr(err);
-+		if (unlikely(err)) {
-+			hinode->hi_notify = NULL;
-+			au_cache_free_hnotify(hn);
-+			/*
-+			 * The upper dir was removed by udba, but the same named
-+			 * dir left. In this case, aufs assignes a new inode
-+			 * number and set the monitor again.
-+			 * For the lower dir, the old monitnor is still left.
-+			 */
-+			if (err == -EEXIST)
-+				err = 0;
-+		}
-+	}
-+
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+void au_hn_free(struct au_hinode *hinode)
-+{
-+	struct au_hnotify *hn;
-+
-+	hn = hinode->hi_notify;
-+	if (hn) {
-+		hinode->hi_notify = NULL;
-+		if (au_hnotify_op.free(hinode, hn))
-+			au_cache_free_hnotify(hn);
-+	}
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+void au_hn_ctl(struct au_hinode *hinode, int do_set)
-+{
-+	if (hinode->hi_notify)
-+		au_hnotify_op.ctl(hinode, do_set);
-+}
-+
-+void au_hn_reset(struct inode *inode, unsigned int flags)
-+{
-+	aufs_bindex_t bindex, bend;
-+	struct inode *hi;
-+	struct dentry *iwhdentry;
-+
-+	bend = au_ibend(inode);
-+	for (bindex = au_ibstart(inode); bindex <= bend; bindex++) {
-+		hi = au_h_iptr(inode, bindex);
-+		if (!hi)
-+			continue;
-+
-+		/* mutex_lock_nested(&hi->i_mutex, AuLsc_I_CHILD); */
-+		iwhdentry = au_hi_wh(inode, bindex);
-+		if (iwhdentry)
-+			dget(iwhdentry);
-+		au_igrab(hi);
-+		au_set_h_iptr(inode, bindex, NULL, 0);
-+		au_set_h_iptr(inode, bindex, au_igrab(hi),
-+			      flags & ~AuHi_XINO);
-+		iput(hi);
-+		dput(iwhdentry);
-+		/* mutex_unlock(&hi->i_mutex); */
-+	}
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static int hn_xino(struct inode *inode, struct inode *h_inode)
-+{
-+	int err;
-+	aufs_bindex_t bindex, bend, bfound, bstart;
-+	struct inode *h_i;
-+
-+	err = 0;
-+	if (unlikely(inode->i_ino == AUFS_ROOT_INO)) {
-+		pr_warn("branch root dir was changed\n");
-+		goto out;
-+	}
-+
-+	bfound = -1;
-+	bend = au_ibend(inode);
-+	bstart = au_ibstart(inode);
-+#if 0 /* reserved for future use */
-+	if (bindex == bend) {
-+		/* keep this ino in rename case */
-+		goto out;
-+	}
-+#endif
-+	for (bindex = bstart; bindex <= bend; bindex++)
-+		if (au_h_iptr(inode, bindex) == h_inode) {
-+			bfound = bindex;
-+			break;
-+		}
-+	if (bfound < 0)
-+		goto out;
-+
-+	for (bindex = bstart; bindex <= bend; bindex++) {
-+		h_i = au_h_iptr(inode, bindex);
-+		if (!h_i)
-+			continue;
-+
-+		err = au_xino_write(inode->i_sb, bindex, h_i->i_ino, /*ino*/0);
-+		/* ignore this error */
-+		/* bad action? */
-+	}
-+
-+	/* children inode number will be broken */
-+
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+static int hn_gen_tree(struct dentry *dentry)
-+{
-+	int err, i, j, ndentry;
-+	struct au_dcsub_pages dpages;
-+	struct au_dpage *dpage;
-+	struct dentry **dentries;
-+
-+	err = au_dpages_init(&dpages, GFP_NOFS);
-+	if (unlikely(err))
-+		goto out;
-+	err = au_dcsub_pages(&dpages, dentry, NULL, NULL);
-+	if (unlikely(err))
-+		goto out_dpages;
-+
-+	for (i = 0; i < dpages.ndpage; i++) {
-+		dpage = dpages.dpages + i;
-+		dentries = dpage->dentries;
-+		ndentry = dpage->ndentry;
-+		for (j = 0; j < ndentry; j++) {
-+			struct dentry *d;
-+
-+			d = dentries[j];
-+			if (IS_ROOT(d))
-+				continue;
-+
-+			au_digen_dec(d);
-+			if (d_really_is_positive(d))
-+				/* todo: reset children xino?
-+				   cached children only? */
-+				au_iigen_dec(d_inode(d));
-+		}
-+	}
-+
-+out_dpages:
-+	au_dpages_free(&dpages);
-+
-+#if 0
-+	/* discard children */
-+	dentry_unhash(dentry);
-+	dput(dentry);
-+#endif
-+out:
-+	return err;
-+}
-+
-+/*
-+ * return 0 if processed.
-+ */
-+static int hn_gen_by_inode(char *name, unsigned int nlen, struct inode *inode,
-+			   const unsigned int isdir)
-+{
-+	int err;
-+	struct dentry *d;
-+	struct qstr *dname;
-+
-+	err = 1;
-+	if (unlikely(inode->i_ino == AUFS_ROOT_INO)) {
-+		pr_warn("branch root dir was changed\n");
-+		err = 0;
-+		goto out;
-+	}
-+
-+	if (!isdir) {
-+		AuDebugOn(!name);
-+		au_iigen_dec(inode);
-+		spin_lock(&inode->i_lock);
-+		hlist_for_each_entry(d, &inode->i_dentry, d_u.d_alias) {
-+			spin_lock(&d->d_lock);
-+			dname = &d->d_name;
-+			if (dname->len != nlen
-+			    && memcmp(dname->name, name, nlen)) {
-+				spin_unlock(&d->d_lock);
-+				continue;
-+			}
-+			err = 0;
-+			au_digen_dec(d);
-+			spin_unlock(&d->d_lock);
-+			break;
-+		}
-+		spin_unlock(&inode->i_lock);
-+	} else {
-+		au_fset_si(au_sbi(inode->i_sb), FAILED_REFRESH_DIR);
-+		d = d_find_any_alias(inode);
-+		if (!d) {
-+			au_iigen_dec(inode);
-+			goto out;
-+		}
-+
-+		spin_lock(&d->d_lock);
-+		dname = &d->d_name;
-+		if (dname->len == nlen && !memcmp(dname->name, name, nlen)) {
-+			spin_unlock(&d->d_lock);
-+			err = hn_gen_tree(d);
-+			spin_lock(&d->d_lock);
-+		}
-+		spin_unlock(&d->d_lock);
-+		dput(d);
-+	}
-+
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+static int hn_gen_by_name(struct dentry *dentry, const unsigned int isdir)
-+{
-+	int err;
-+
-+	if (IS_ROOT(dentry)) {
-+		pr_warn("branch root dir was changed\n");
-+		return 0;
-+	}
-+
-+	err = 0;
-+	if (!isdir) {
-+		au_digen_dec(dentry);
-+		if (d_really_is_positive(dentry))
-+			au_iigen_dec(d_inode(dentry));
-+	} else {
-+		au_fset_si(au_sbi(dentry->d_sb), FAILED_REFRESH_DIR);
-+		if (d_really_is_positive(dentry))
-+			err = hn_gen_tree(dentry);
-+	}
-+
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* hnotify job flags */
-+#define AuHnJob_XINO0		1
-+#define AuHnJob_GEN		(1 << 1)
-+#define AuHnJob_DIRENT		(1 << 2)
-+#define AuHnJob_ISDIR		(1 << 3)
-+#define AuHnJob_TRYXINO0	(1 << 4)
-+#define AuHnJob_MNTPNT		(1 << 5)
-+#define au_ftest_hnjob(flags, name)	((flags) & AuHnJob_##name)
-+#define au_fset_hnjob(flags, name) \
-+	do { (flags) |= AuHnJob_##name; } while (0)
-+#define au_fclr_hnjob(flags, name) \
-+	do { (flags) &= ~AuHnJob_##name; } while (0)
-+
-+enum {
-+	AuHn_CHILD,
-+	AuHn_PARENT,
-+	AuHnLast
-+};
-+
-+struct au_hnotify_args {
-+	struct inode *h_dir, *dir, *h_child_inode;
-+	u32 mask;
-+	unsigned int flags[AuHnLast];
-+	unsigned int h_child_nlen;
-+	char h_child_name[];
-+};
-+
-+struct hn_job_args {
-+	unsigned int flags;
-+	struct inode *inode, *h_inode, *dir, *h_dir;
-+	struct dentry *dentry;
-+	char *h_name;
-+	int h_nlen;
-+};
-+
-+static int hn_job(struct hn_job_args *a)
-+{
-+	const unsigned int isdir = au_ftest_hnjob(a->flags, ISDIR);
-+	int e;
-+
-+	/* reset xino */
-+	if (au_ftest_hnjob(a->flags, XINO0) && a->inode)
-+		hn_xino(a->inode, a->h_inode); /* ignore this error */
-+
-+	if (au_ftest_hnjob(a->flags, TRYXINO0)
-+	    && a->inode
-+	    && a->h_inode) {
-+		mutex_lock_nested(&a->h_inode->i_mutex, AuLsc_I_CHILD);
-+		if (!a->h_inode->i_nlink
-+		    && !(a->h_inode->i_state & I_LINKABLE))
-+			hn_xino(a->inode, a->h_inode); /* ignore this error */
-+		mutex_unlock(&a->h_inode->i_mutex);
-+	}
-+
-+	/* make the generation obsolete */
-+	if (au_ftest_hnjob(a->flags, GEN)) {
-+		e = -1;
-+		if (a->inode)
-+			e = hn_gen_by_inode(a->h_name, a->h_nlen, a->inode,
-+					      isdir);
-+		if (e && a->dentry)
-+			hn_gen_by_name(a->dentry, isdir);
-+		/* ignore this error */
-+	}
-+
-+	/* make dir entries obsolete */
-+	if (au_ftest_hnjob(a->flags, DIRENT) && a->inode) {
-+		struct au_vdir *vdir;
-+
-+		vdir = au_ivdir(a->inode);
-+		if (vdir)
-+			vdir->vd_jiffy = 0;
-+		/* IMustLock(a->inode); */
-+		/* a->inode->i_version++; */
-+	}
-+
-+	/* can do nothing but warn */
-+	if (au_ftest_hnjob(a->flags, MNTPNT)
-+	    && a->dentry
-+	    && d_mountpoint(a->dentry))
-+		pr_warn("mount-point %pd is removed or renamed\n", a->dentry);
-+
-+	return 0;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static struct dentry *lookup_wlock_by_name(char *name, unsigned int nlen,
-+					   struct inode *dir)
-+{
-+	struct dentry *dentry, *d, *parent;
-+	struct qstr *dname;
-+
-+	parent = d_find_any_alias(dir);
-+	if (!parent)
-+		return NULL;
-+
-+	dentry = NULL;
-+	spin_lock(&parent->d_lock);
-+	list_for_each_entry(d, &parent->d_subdirs, d_child) {
-+		/* AuDbg("%pd\n", d); */
-+		spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED);
-+		dname = &d->d_name;
-+		if (dname->len != nlen || memcmp(dname->name, name, nlen))
-+			goto cont_unlock;
-+		if (au_di(d))
-+			au_digen_dec(d);
-+		else
-+			goto cont_unlock;
-+		if (au_dcount(d) > 0) {
-+			dentry = dget_dlock(d);
-+			spin_unlock(&d->d_lock);
-+			break;
-+		}
-+
-+cont_unlock:
-+		spin_unlock(&d->d_lock);
-+	}
-+	spin_unlock(&parent->d_lock);
-+	dput(parent);
-+
-+	if (dentry)
-+		di_write_lock_child(dentry);
-+
-+	return dentry;
-+}
-+
-+static struct inode *lookup_wlock_by_ino(struct super_block *sb,
-+					 aufs_bindex_t bindex, ino_t h_ino)
-+{
-+	struct inode *inode;
-+	ino_t ino;
-+	int err;
-+
-+	inode = NULL;
-+	err = au_xino_read(sb, bindex, h_ino, &ino);
-+	if (!err && ino)
-+		inode = ilookup(sb, ino);
-+	if (!inode)
-+		goto out;
-+
-+	if (unlikely(inode->i_ino == AUFS_ROOT_INO)) {
-+		pr_warn("wrong root branch\n");
-+		iput(inode);
-+		inode = NULL;
-+		goto out;
-+	}
-+
-+	ii_write_lock_child(inode);
-+
-+out:
-+	return inode;
-+}
-+
-+static void au_hn_bh(void *_args)
-+{
-+	struct au_hnotify_args *a = _args;
-+	struct super_block *sb;
-+	aufs_bindex_t bindex, bend, bfound;
-+	unsigned char xino, try_iput;
-+	int err;
-+	struct inode *inode;
-+	ino_t h_ino;
-+	struct hn_job_args args;
-+	struct dentry *dentry;
-+	struct au_sbinfo *sbinfo;
-+
-+	AuDebugOn(!_args);
-+	AuDebugOn(!a->h_dir);
-+	AuDebugOn(!a->dir);
-+	AuDebugOn(!a->mask);
-+	AuDbg("mask 0x%x, i%lu, hi%lu, hci%lu\n",
-+	      a->mask, a->dir->i_ino, a->h_dir->i_ino,
-+	      a->h_child_inode ? a->h_child_inode->i_ino : 0);
-+
-+	inode = NULL;
-+	dentry = NULL;
-+	/*
-+	 * do not lock a->dir->i_mutex here
-+	 * because of d_revalidate() may cause a deadlock.
-+	 */
-+	sb = a->dir->i_sb;
-+	AuDebugOn(!sb);
-+	sbinfo = au_sbi(sb);
-+	AuDebugOn(!sbinfo);
-+	si_write_lock(sb, AuLock_NOPLMW);
-+
-+	ii_read_lock_parent(a->dir);
-+	bfound = -1;
-+	bend = au_ibend(a->dir);
-+	for (bindex = au_ibstart(a->dir); bindex <= bend; bindex++)
-+		if (au_h_iptr(a->dir, bindex) == a->h_dir) {
-+			bfound = bindex;
-+			break;
-+		}
-+	ii_read_unlock(a->dir);
-+	if (unlikely(bfound < 0))
-+		goto out;
-+
-+	xino = !!au_opt_test(au_mntflags(sb), XINO);
-+	h_ino = 0;
-+	if (a->h_child_inode)
-+		h_ino = a->h_child_inode->i_ino;
-+
-+	if (a->h_child_nlen
-+	    && (au_ftest_hnjob(a->flags[AuHn_CHILD], GEN)
-+		|| au_ftest_hnjob(a->flags[AuHn_CHILD], MNTPNT)))
-+		dentry = lookup_wlock_by_name(a->h_child_name, a->h_child_nlen,
-+					      a->dir);
-+	try_iput = 0;
-+	if (dentry && d_really_is_positive(dentry))
-+		inode = d_inode(dentry);
-+	if (xino && !inode && h_ino
-+	    && (au_ftest_hnjob(a->flags[AuHn_CHILD], XINO0)
-+		|| au_ftest_hnjob(a->flags[AuHn_CHILD], TRYXINO0)
-+		|| au_ftest_hnjob(a->flags[AuHn_CHILD], GEN))) {
-+		inode = lookup_wlock_by_ino(sb, bfound, h_ino);
-+		try_iput = 1;
-+	    }
-+
-+	args.flags = a->flags[AuHn_CHILD];
-+	args.dentry = dentry;
-+	args.inode = inode;
-+	args.h_inode = a->h_child_inode;
-+	args.dir = a->dir;
-+	args.h_dir = a->h_dir;
-+	args.h_name = a->h_child_name;
-+	args.h_nlen = a->h_child_nlen;
-+	err = hn_job(&args);
-+	if (dentry) {
-+		if (au_di(dentry))
-+			di_write_unlock(dentry);
-+		dput(dentry);
-+	}
-+	if (inode && try_iput) {
-+		ii_write_unlock(inode);
-+		iput(inode);
-+	}
-+
-+	ii_write_lock_parent(a->dir);
-+	args.flags = a->flags[AuHn_PARENT];
-+	args.dentry = NULL;
-+	args.inode = a->dir;
-+	args.h_inode = a->h_dir;
-+	args.dir = NULL;
-+	args.h_dir = NULL;
-+	args.h_name = NULL;
-+	args.h_nlen = 0;
-+	err = hn_job(&args);
-+	ii_write_unlock(a->dir);
-+
-+out:
-+	iput(a->h_child_inode);
-+	iput(a->h_dir);
-+	iput(a->dir);
-+	si_write_unlock(sb);
-+	au_nwt_done(&sbinfo->si_nowait);
-+	kfree(a);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+int au_hnotify(struct inode *h_dir, struct au_hnotify *hnotify, u32 mask,
-+	       struct qstr *h_child_qstr, struct inode *h_child_inode)
-+{
-+	int err, len;
-+	unsigned int flags[AuHnLast], f;
-+	unsigned char isdir, isroot, wh;
-+	struct inode *dir;
-+	struct au_hnotify_args *args;
-+	char *p, *h_child_name;
-+
-+	err = 0;
-+	AuDebugOn(!hnotify || !hnotify->hn_aufs_inode);
-+	dir = igrab(hnotify->hn_aufs_inode);
-+	if (!dir)
-+		goto out;
-+
-+	isroot = (dir->i_ino == AUFS_ROOT_INO);
-+	wh = 0;
-+	h_child_name = (void *)h_child_qstr->name;
-+	len = h_child_qstr->len;
-+	if (h_child_name) {
-+		if (len > AUFS_WH_PFX_LEN
-+		    && !memcmp(h_child_name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) {
-+			h_child_name += AUFS_WH_PFX_LEN;
-+			len -= AUFS_WH_PFX_LEN;
-+			wh = 1;
-+		}
-+	}
-+
-+	isdir = 0;
-+	if (h_child_inode)
-+		isdir = !!S_ISDIR(h_child_inode->i_mode);
-+	flags[AuHn_PARENT] = AuHnJob_ISDIR;
-+	flags[AuHn_CHILD] = 0;
-+	if (isdir)
-+		flags[AuHn_CHILD] = AuHnJob_ISDIR;
-+	au_fset_hnjob(flags[AuHn_PARENT], DIRENT);
-+	au_fset_hnjob(flags[AuHn_CHILD], GEN);
-+	switch (mask & FS_EVENTS_POSS_ON_CHILD) {
-+	case FS_MOVED_FROM:
-+	case FS_MOVED_TO:
-+		au_fset_hnjob(flags[AuHn_CHILD], XINO0);
-+		au_fset_hnjob(flags[AuHn_CHILD], MNTPNT);
-+		/*FALLTHROUGH*/
-+	case FS_CREATE:
-+		AuDebugOn(!h_child_name);
-+		break;
-+
-+	case FS_DELETE:
-+		/*
-+		 * aufs never be able to get this child inode.
-+		 * revalidation should be in d_revalidate()
-+		 * by checking i_nlink, i_generation or d_unhashed().
-+		 */
-+		AuDebugOn(!h_child_name);
-+		au_fset_hnjob(flags[AuHn_CHILD], TRYXINO0);
-+		au_fset_hnjob(flags[AuHn_CHILD], MNTPNT);
-+		break;
-+
-+	default:
-+		AuDebugOn(1);
-+	}
-+
-+	if (wh)
-+		h_child_inode = NULL;
-+
-+	err = -ENOMEM;
-+	/* iput() and kfree() will be called in au_hnotify() */
-+	args = kmalloc(sizeof(*args) + len + 1, GFP_NOFS);
-+	if (unlikely(!args)) {
-+		AuErr1("no memory\n");
-+		iput(dir);
-+		goto out;
-+	}
-+	args->flags[AuHn_PARENT] = flags[AuHn_PARENT];
-+	args->flags[AuHn_CHILD] = flags[AuHn_CHILD];
-+	args->mask = mask;
-+	args->dir = dir;
-+	args->h_dir = igrab(h_dir);
-+	if (h_child_inode)
-+		h_child_inode = igrab(h_child_inode); /* can be NULL */
-+	args->h_child_inode = h_child_inode;
-+	args->h_child_nlen = len;
-+	if (len) {
-+		p = (void *)args;
-+		p += sizeof(*args);
-+		memcpy(p, h_child_name, len);
-+		p[len] = 0;
-+	}
-+
-+	/* NFS fires the event for silly-renamed one from kworker */
-+	f = 0;
-+	if (!dir->i_nlink
-+	    || (au_test_nfs(h_dir->i_sb) && (mask & FS_DELETE)))
-+		f = AuWkq_NEST;
-+	err = au_wkq_nowait(au_hn_bh, args, dir->i_sb, f);
-+	if (unlikely(err)) {
-+		pr_err("wkq %d\n", err);
-+		iput(args->h_child_inode);
-+		iput(args->h_dir);
-+		iput(args->dir);
-+		kfree(args);
-+	}
-+
-+out:
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+int au_hnotify_reset_br(unsigned int udba, struct au_branch *br, int perm)
-+{
-+	int err;
-+
-+	AuDebugOn(!(udba & AuOptMask_UDBA));
-+
-+	err = 0;
-+	if (au_hnotify_op.reset_br)
-+		err = au_hnotify_op.reset_br(udba, br, perm);
-+
-+	return err;
-+}
-+
-+int au_hnotify_init_br(struct au_branch *br, int perm)
-+{
-+	int err;
-+
-+	err = 0;
-+	if (au_hnotify_op.init_br)
-+		err = au_hnotify_op.init_br(br, perm);
-+
-+	return err;
-+}
-+
-+void au_hnotify_fin_br(struct au_branch *br)
-+{
-+	if (au_hnotify_op.fin_br)
-+		au_hnotify_op.fin_br(br);
-+}
-+
-+static void au_hn_destroy_cache(void)
-+{
-+	kmem_cache_destroy(au_cachep[AuCache_HNOTIFY]);
-+	au_cachep[AuCache_HNOTIFY] = NULL;
-+}
-+
-+int __init au_hnotify_init(void)
-+{
-+	int err;
-+
-+	err = -ENOMEM;
-+	au_cachep[AuCache_HNOTIFY] = AuCache(au_hnotify);
-+	if (au_cachep[AuCache_HNOTIFY]) {
-+		err = 0;
-+		if (au_hnotify_op.init)
-+			err = au_hnotify_op.init();
-+		if (unlikely(err))
-+			au_hn_destroy_cache();
-+	}
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+void au_hnotify_fin(void)
-+{
-+	if (au_hnotify_op.fin)
-+		au_hnotify_op.fin();
-+	/* cf. au_cache_fin() */
-+	if (au_cachep[AuCache_HNOTIFY])
-+		au_hn_destroy_cache();
-+}
-diff -Nur linux-4.1.10.orig/fs/aufs/iinfo.c linux-4.1.10/fs/aufs/iinfo.c
---- linux-4.1.10.orig/fs/aufs/iinfo.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/iinfo.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,277 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * inode private data
-+ */
-+
-+#include "aufs.h"
-+
-+struct inode *au_h_iptr(struct inode *inode, aufs_bindex_t bindex)
-+{
-+	struct inode *h_inode;
-+
-+	IiMustAnyLock(inode);
-+
-+	h_inode = au_ii(inode)->ii_hinode[0 + bindex].hi_inode;
-+	AuDebugOn(h_inode && atomic_read(&h_inode->i_count) <= 0);
-+	return h_inode;
-+}
-+
-+/* todo: hard/soft set? */
-+void au_hiput(struct au_hinode *hinode)
-+{
-+	au_hn_free(hinode);
-+	dput(hinode->hi_whdentry);
-+	iput(hinode->hi_inode);
-+}
-+
-+unsigned int au_hi_flags(struct inode *inode, int isdir)
-+{
-+	unsigned int flags;
-+	const unsigned int mnt_flags = au_mntflags(inode->i_sb);
-+
-+	flags = 0;
-+	if (au_opt_test(mnt_flags, XINO))
-+		au_fset_hi(flags, XINO);
-+	if (isdir && au_opt_test(mnt_flags, UDBA_HNOTIFY))
-+		au_fset_hi(flags, HNOTIFY);
-+	return flags;
-+}
-+
-+void au_set_h_iptr(struct inode *inode, aufs_bindex_t bindex,
-+		   struct inode *h_inode, unsigned int flags)
-+{
-+	struct au_hinode *hinode;
-+	struct inode *hi;
-+	struct au_iinfo *iinfo = au_ii(inode);
-+
-+	IiMustWriteLock(inode);
-+
-+	hinode = iinfo->ii_hinode + bindex;
-+	hi = hinode->hi_inode;
-+	AuDebugOn(h_inode && atomic_read(&h_inode->i_count) <= 0);
-+
-+	if (hi)
-+		au_hiput(hinode);
-+	hinode->hi_inode = h_inode;
-+	if (h_inode) {
-+		int err;
-+		struct super_block *sb = inode->i_sb;
-+		struct au_branch *br;
-+
-+		AuDebugOn(inode->i_mode
-+			  && (h_inode->i_mode & S_IFMT)
-+			  != (inode->i_mode & S_IFMT));
-+		if (bindex == iinfo->ii_bstart)
-+			au_cpup_igen(inode, h_inode);
-+		br = au_sbr(sb, bindex);
-+		hinode->hi_id = br->br_id;
-+		if (au_ftest_hi(flags, XINO)) {
-+			err = au_xino_write(sb, bindex, h_inode->i_ino,
-+					    inode->i_ino);
-+			if (unlikely(err))
-+				AuIOErr1("failed au_xino_write() %d\n", err);
-+		}
-+
-+		if (au_ftest_hi(flags, HNOTIFY)
-+		    && au_br_hnotifyable(br->br_perm)) {
-+			err = au_hn_alloc(hinode, inode);
-+			if (unlikely(err))
-+				AuIOErr1("au_hn_alloc() %d\n", err);
-+		}
-+	}
-+}
-+
-+void au_set_hi_wh(struct inode *inode, aufs_bindex_t bindex,
-+		  struct dentry *h_wh)
-+{
-+	struct au_hinode *hinode;
-+
-+	IiMustWriteLock(inode);
-+
-+	hinode = au_ii(inode)->ii_hinode + bindex;
-+	AuDebugOn(hinode->hi_whdentry);
-+	hinode->hi_whdentry = h_wh;
-+}
-+
-+void au_update_iigen(struct inode *inode, int half)
-+{
-+	struct au_iinfo *iinfo;
-+	struct au_iigen *iigen;
-+	unsigned int sigen;
-+
-+	sigen = au_sigen(inode->i_sb);
-+	iinfo = au_ii(inode);
-+	iigen = &iinfo->ii_generation;
-+	spin_lock(&iinfo->ii_genspin);
-+	iigen->ig_generation = sigen;
-+	if (half)
-+		au_ig_fset(iigen->ig_flags, HALF_REFRESHED);
-+	else
-+		au_ig_fclr(iigen->ig_flags, HALF_REFRESHED);
-+	spin_unlock(&iinfo->ii_genspin);
-+}
-+
-+/* it may be called at remount time, too */
-+void au_update_ibrange(struct inode *inode, int do_put_zero)
-+{
-+	struct au_iinfo *iinfo;
-+	aufs_bindex_t bindex, bend;
-+
-+	iinfo = au_ii(inode);
-+	if (!iinfo)
-+		return;
-+
-+	IiMustWriteLock(inode);
-+
-+	if (do_put_zero && iinfo->ii_bstart >= 0) {
-+		for (bindex = iinfo->ii_bstart; bindex <= iinfo->ii_bend;
-+		     bindex++) {
-+			struct inode *h_i;
-+
-+			h_i = iinfo->ii_hinode[0 + bindex].hi_inode;
-+			if (h_i
-+			    && !h_i->i_nlink
-+			    && !(h_i->i_state & I_LINKABLE))
-+				au_set_h_iptr(inode, bindex, NULL, 0);
-+		}
-+	}
-+
-+	iinfo->ii_bstart = -1;
-+	iinfo->ii_bend = -1;
-+	bend = au_sbend(inode->i_sb);
-+	for (bindex = 0; bindex <= bend; bindex++)
-+		if (iinfo->ii_hinode[0 + bindex].hi_inode) {
-+			iinfo->ii_bstart = bindex;
-+			break;
-+		}
-+	if (iinfo->ii_bstart >= 0)
-+		for (bindex = bend; bindex >= iinfo->ii_bstart; bindex--)
-+			if (iinfo->ii_hinode[0 + bindex].hi_inode) {
-+				iinfo->ii_bend = bindex;
-+				break;
-+			}
-+	AuDebugOn(iinfo->ii_bstart > iinfo->ii_bend);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+void au_icntnr_init_once(void *_c)
-+{
-+	struct au_icntnr *c = _c;
-+	struct au_iinfo *iinfo = &c->iinfo;
-+	static struct lock_class_key aufs_ii;
-+
-+	spin_lock_init(&iinfo->ii_genspin);
-+	au_rw_init(&iinfo->ii_rwsem);
-+	au_rw_class(&iinfo->ii_rwsem, &aufs_ii);
-+	inode_init_once(&c->vfs_inode);
-+}
-+
-+int au_iinfo_init(struct inode *inode)
-+{
-+	struct au_iinfo *iinfo;
-+	struct super_block *sb;
-+	int nbr, i;
-+
-+	sb = inode->i_sb;
-+	iinfo = &(container_of(inode, struct au_icntnr, vfs_inode)->iinfo);
-+	nbr = au_sbend(sb) + 1;
-+	if (unlikely(nbr <= 0))
-+		nbr = 1;
-+	iinfo->ii_hinode = kcalloc(nbr, sizeof(*iinfo->ii_hinode), GFP_NOFS);
-+	if (iinfo->ii_hinode) {
-+		au_ninodes_inc(sb);
-+		for (i = 0; i < nbr; i++)
-+			iinfo->ii_hinode[i].hi_id = -1;
-+
-+		iinfo->ii_generation.ig_generation = au_sigen(sb);
-+		iinfo->ii_bstart = -1;
-+		iinfo->ii_bend = -1;
-+		iinfo->ii_vdir = NULL;
-+		return 0;
-+	}
-+	return -ENOMEM;
-+}
-+
-+int au_ii_realloc(struct au_iinfo *iinfo, int nbr)
-+{
-+	int err, sz;
-+	struct au_hinode *hip;
-+
-+	AuRwMustWriteLock(&iinfo->ii_rwsem);
-+
-+	err = -ENOMEM;
-+	sz = sizeof(*hip) * (iinfo->ii_bend + 1);
-+	if (!sz)
-+		sz = sizeof(*hip);
-+	hip = au_kzrealloc(iinfo->ii_hinode, sz, sizeof(*hip) * nbr, GFP_NOFS);
-+	if (hip) {
-+		iinfo->ii_hinode = hip;
-+		err = 0;
-+	}
-+
-+	return err;
-+}
-+
-+void au_iinfo_fin(struct inode *inode)
-+{
-+	struct au_iinfo *iinfo;
-+	struct au_hinode *hi;
-+	struct super_block *sb;
-+	aufs_bindex_t bindex, bend;
-+	const unsigned char unlinked = !inode->i_nlink;
-+
-+	iinfo = au_ii(inode);
-+	/* bad_inode case */
-+	if (!iinfo)
-+		return;
-+
-+	sb = inode->i_sb;
-+	au_ninodes_dec(sb);
-+	if (si_pid_test(sb))
-+		au_xino_delete_inode(inode, unlinked);
-+	else {
-+		/*
-+		 * it is safe to hide the dependency between sbinfo and
-+		 * sb->s_umount.
-+		 */
-+		lockdep_off();
-+		si_noflush_read_lock(sb);
-+		au_xino_delete_inode(inode, unlinked);
-+		si_read_unlock(sb);
-+		lockdep_on();
-+	}
-+
-+	if (iinfo->ii_vdir)
-+		au_vdir_free(iinfo->ii_vdir);
-+
-+	bindex = iinfo->ii_bstart;
-+	if (bindex >= 0) {
-+		hi = iinfo->ii_hinode + bindex;
-+		bend = iinfo->ii_bend;
-+		while (bindex++ <= bend) {
-+			if (hi->hi_inode)
-+				au_hiput(hi);
-+			hi++;
-+		}
-+	}
-+	kfree(iinfo->ii_hinode);
-+	iinfo->ii_hinode = NULL;
-+	AuRwDestroy(&iinfo->ii_rwsem);
-+}
-diff -Nur linux-4.1.10.orig/fs/aufs/inode.c linux-4.1.10/fs/aufs/inode.c
---- linux-4.1.10.orig/fs/aufs/inode.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/inode.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,500 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * inode functions
-+ */
-+
-+#include "aufs.h"
-+
-+struct inode *au_igrab(struct inode *inode)
-+{
-+	if (inode) {
-+		AuDebugOn(!atomic_read(&inode->i_count));
-+		ihold(inode);
-+	}
-+	return inode;
-+}
-+
-+static void au_refresh_hinode_attr(struct inode *inode, int do_version)
-+{
-+	au_cpup_attr_all(inode, /*force*/0);
-+	au_update_iigen(inode, /*half*/1);
-+	if (do_version)
-+		inode->i_version++;
-+}
-+
-+static int au_ii_refresh(struct inode *inode, int *update)
-+{
-+	int err, e;
-+	umode_t type;
-+	aufs_bindex_t bindex, new_bindex;
-+	struct super_block *sb;
-+	struct au_iinfo *iinfo;
-+	struct au_hinode *p, *q, tmp;
-+
-+	IiMustWriteLock(inode);
-+
-+	*update = 0;
-+	sb = inode->i_sb;
-+	type = inode->i_mode & S_IFMT;
-+	iinfo = au_ii(inode);
-+	err = au_ii_realloc(iinfo, au_sbend(sb) + 1);
-+	if (unlikely(err))
-+		goto out;
-+
-+	AuDebugOn(iinfo->ii_bstart < 0);
-+	p = iinfo->ii_hinode + iinfo->ii_bstart;
-+	for (bindex = iinfo->ii_bstart; bindex <= iinfo->ii_bend;
-+	     bindex++, p++) {
-+		if (!p->hi_inode)
-+			continue;
-+
-+		AuDebugOn(type != (p->hi_inode->i_mode & S_IFMT));
-+		new_bindex = au_br_index(sb, p->hi_id);
-+		if (new_bindex == bindex)
-+			continue;
-+
-+		if (new_bindex < 0) {
-+			*update = 1;
-+			au_hiput(p);
-+			p->hi_inode = NULL;
-+			continue;
-+		}
-+
-+		if (new_bindex < iinfo->ii_bstart)
-+			iinfo->ii_bstart = new_bindex;
-+		if (iinfo->ii_bend < new_bindex)
-+			iinfo->ii_bend = new_bindex;
-+		/* swap two lower inode, and loop again */
-+		q = iinfo->ii_hinode + new_bindex;
-+		tmp = *q;
-+		*q = *p;
-+		*p = tmp;
-+		if (tmp.hi_inode) {
-+			bindex--;
-+			p--;
-+		}
-+	}
-+	au_update_ibrange(inode, /*do_put_zero*/0);
-+	e = au_dy_irefresh(inode);
-+	if (unlikely(e && !err))
-+		err = e;
-+
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+int au_refresh_hinode_self(struct inode *inode)
-+{
-+	int err, update;
-+
-+	err = au_ii_refresh(inode, &update);
-+	if (!err)
-+		au_refresh_hinode_attr(inode, update && S_ISDIR(inode->i_mode));
-+
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+int au_refresh_hinode(struct inode *inode, struct dentry *dentry)
-+{
-+	int err, e, update;
-+	unsigned int flags;
-+	umode_t mode;
-+	aufs_bindex_t bindex, bend;
-+	unsigned char isdir;
-+	struct au_hinode *p;
-+	struct au_iinfo *iinfo;
-+
-+	err = au_ii_refresh(inode, &update);
-+	if (unlikely(err))
-+		goto out;
-+
-+	update = 0;
-+	iinfo = au_ii(inode);
-+	p = iinfo->ii_hinode + iinfo->ii_bstart;
-+	mode = (inode->i_mode & S_IFMT);
-+	isdir = S_ISDIR(mode);
-+	flags = au_hi_flags(inode, isdir);
-+	bend = au_dbend(dentry);
-+	for (bindex = au_dbstart(dentry); bindex <= bend; bindex++) {
-+		struct inode *h_i, *h_inode;
-+		struct dentry *h_d;
-+
-+		h_d = au_h_dptr(dentry, bindex);
-+		if (!h_d || d_is_negative(h_d))
-+			continue;
-+
-+		h_inode = d_inode(h_d);
-+		AuDebugOn(mode != (h_inode->i_mode & S_IFMT));
-+		if (iinfo->ii_bstart <= bindex && bindex <= iinfo->ii_bend) {
-+			h_i = au_h_iptr(inode, bindex);
-+			if (h_i) {
-+				if (h_i == h_inode)
-+					continue;
-+				err = -EIO;
-+				break;
-+			}
-+		}
-+		if (bindex < iinfo->ii_bstart)
-+			iinfo->ii_bstart = bindex;
-+		if (iinfo->ii_bend < bindex)
-+			iinfo->ii_bend = bindex;
-+		au_set_h_iptr(inode, bindex, au_igrab(h_inode), flags);
-+		update = 1;
-+	}
-+	au_update_ibrange(inode, /*do_put_zero*/0);
-+	e = au_dy_irefresh(inode);
-+	if (unlikely(e && !err))
-+		err = e;
-+	if (!err)
-+		au_refresh_hinode_attr(inode, update && isdir);
-+
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+static int set_inode(struct inode *inode, struct dentry *dentry)
-+{
-+	int err;
-+	unsigned int flags;
-+	umode_t mode;
-+	aufs_bindex_t bindex, bstart, btail;
-+	unsigned char isdir;
-+	struct dentry *h_dentry;
-+	struct inode *h_inode;
-+	struct au_iinfo *iinfo;
-+
-+	IiMustWriteLock(inode);
-+
-+	err = 0;
-+	isdir = 0;
-+	bstart = au_dbstart(dentry);
-+	h_dentry = au_h_dptr(dentry, bstart);
-+	h_inode = d_inode(h_dentry);
-+	mode = h_inode->i_mode;
-+	switch (mode & S_IFMT) {
-+	case S_IFREG:
-+		btail = au_dbtail(dentry);
-+		inode->i_op = &aufs_iop;
-+		inode->i_fop = &aufs_file_fop;
-+		err = au_dy_iaop(inode, bstart, h_inode);
-+		if (unlikely(err))
-+			goto out;
-+		break;
-+	case S_IFDIR:
-+		isdir = 1;
-+		btail = au_dbtaildir(dentry);
-+		inode->i_op = &aufs_dir_iop;
-+		inode->i_fop = &aufs_dir_fop;
-+		break;
-+	case S_IFLNK:
-+		btail = au_dbtail(dentry);
-+		inode->i_op = &aufs_symlink_iop;
-+		break;
-+	case S_IFBLK:
-+	case S_IFCHR:
-+	case S_IFIFO:
-+	case S_IFSOCK:
-+		btail = au_dbtail(dentry);
-+		inode->i_op = &aufs_iop;
-+		init_special_inode(inode, mode, h_inode->i_rdev);
-+		break;
-+	default:
-+		AuIOErr("Unknown file type 0%o\n", mode);
-+		err = -EIO;
-+		goto out;
-+	}
-+
-+	/* do not set hnotify for whiteouted dirs (SHWH mode) */
-+	flags = au_hi_flags(inode, isdir);
-+	if (au_opt_test(au_mntflags(dentry->d_sb), SHWH)
-+	    && au_ftest_hi(flags, HNOTIFY)
-+	    && dentry->d_name.len > AUFS_WH_PFX_LEN
-+	    && !memcmp(dentry->d_name.name, AUFS_WH_PFX, AUFS_WH_PFX_LEN))
-+		au_fclr_hi(flags, HNOTIFY);
-+	iinfo = au_ii(inode);
-+	iinfo->ii_bstart = bstart;
-+	iinfo->ii_bend = btail;
-+	for (bindex = bstart; bindex <= btail; bindex++) {
-+		h_dentry = au_h_dptr(dentry, bindex);
-+		if (h_dentry)
-+			au_set_h_iptr(inode, bindex,
-+				      au_igrab(d_inode(h_dentry)), flags);
-+	}
-+	au_cpup_attr_all(inode, /*force*/1);
-+	/*
-+	 * to force calling aufs_get_acl() every time,
-+	 * do not call cache_no_acl() for aufs inode.
-+	 */
-+
-+out:
-+	return err;
-+}
-+
-+/*
-+ * successful returns with iinfo write_locked
-+ * minus: errno
-+ * zero: success, matched
-+ * plus: no error, but unmatched
-+ */
-+static int reval_inode(struct inode *inode, struct dentry *dentry)
-+{
-+	int err;
-+	unsigned int gen;
-+	struct au_iigen iigen;
-+	aufs_bindex_t bindex, bend;
-+	struct inode *h_inode, *h_dinode;
-+	struct dentry *h_dentry;
-+
-+	/*
-+	 * before this function, if aufs got any iinfo lock, it must be only
-+	 * one, the parent dir.
-+	 * it can happen by UDBA and the obsoleted inode number.
-+	 */
-+	err = -EIO;
-+	if (unlikely(inode->i_ino == parent_ino(dentry)))
-+		goto out;
-+
-+	err = 1;
-+	ii_write_lock_new_child(inode);
-+	h_dentry = au_h_dptr(dentry, au_dbstart(dentry));
-+	h_dinode = d_inode(h_dentry);
-+	bend = au_ibend(inode);
-+	for (bindex = au_ibstart(inode); bindex <= bend; bindex++) {
-+		h_inode = au_h_iptr(inode, bindex);
-+		if (!h_inode || h_inode != h_dinode)
-+			continue;
-+
-+		err = 0;
-+		gen = au_iigen(inode, &iigen);
-+		if (gen == au_digen(dentry)
-+		    && !au_ig_ftest(iigen.ig_flags, HALF_REFRESHED))
-+			break;
-+
-+		/* fully refresh inode using dentry */
-+		err = au_refresh_hinode(inode, dentry);
-+		if (!err)
-+			au_update_iigen(inode, /*half*/0);
-+		break;
-+	}
-+
-+	if (unlikely(err))
-+		ii_write_unlock(inode);
-+out:
-+	return err;
-+}
-+
-+int au_ino(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
-+	   unsigned int d_type, ino_t *ino)
-+{
-+	int err;
-+	struct mutex *mtx;
-+
-+	/* prevent hardlinked inode number from race condition */
-+	mtx = NULL;
-+	if (d_type != DT_DIR) {
-+		mtx = &au_sbr(sb, bindex)->br_xino.xi_nondir_mtx;
-+		mutex_lock(mtx);
-+	}
-+	err = au_xino_read(sb, bindex, h_ino, ino);
-+	if (unlikely(err))
-+		goto out;
-+
-+	if (!*ino) {
-+		err = -EIO;
-+		*ino = au_xino_new_ino(sb);
-+		if (unlikely(!*ino))
-+			goto out;
-+		err = au_xino_write(sb, bindex, h_ino, *ino);
-+		if (unlikely(err))
-+			goto out;
-+	}
-+
-+out:
-+	if (mtx)
-+		mutex_unlock(mtx);
-+	return err;
-+}
-+
-+/* successful returns with iinfo write_locked */
-+/* todo: return with unlocked? */
-+struct inode *au_new_inode(struct dentry *dentry, int must_new)
-+{
-+	struct inode *inode, *h_inode;
-+	struct dentry *h_dentry;
-+	struct super_block *sb;
-+	struct mutex *mtx;
-+	ino_t h_ino, ino;
-+	int err;
-+	aufs_bindex_t bstart;
-+
-+	sb = dentry->d_sb;
-+	bstart = au_dbstart(dentry);
-+	h_dentry = au_h_dptr(dentry, bstart);
-+	h_inode = d_inode(h_dentry);
-+	h_ino = h_inode->i_ino;
-+
-+	/*
-+	 * stop 'race'-ing between hardlinks under different
-+	 * parents.
-+	 */
-+	mtx = NULL;
-+	if (!d_is_dir(h_dentry))
-+		mtx = &au_sbr(sb, bstart)->br_xino.xi_nondir_mtx;
-+
-+new_ino:
-+	if (mtx)
-+		mutex_lock(mtx);
-+	err = au_xino_read(sb, bstart, h_ino, &ino);
-+	inode = ERR_PTR(err);
-+	if (unlikely(err))
-+		goto out;
-+
-+	if (!ino) {
-+		ino = au_xino_new_ino(sb);
-+		if (unlikely(!ino)) {
-+			inode = ERR_PTR(-EIO);
-+			goto out;
-+		}
-+	}
-+
-+	AuDbg("i%lu\n", (unsigned long)ino);
-+	inode = au_iget_locked(sb, ino);
-+	err = PTR_ERR(inode);
-+	if (IS_ERR(inode))
-+		goto out;
-+
-+	AuDbg("%lx, new %d\n", inode->i_state, !!(inode->i_state & I_NEW));
-+	if (inode->i_state & I_NEW) {
-+		/* verbose coding for lock class name */
-+		if (unlikely(d_is_symlink(h_dentry)))
-+			au_rw_class(&au_ii(inode)->ii_rwsem,
-+				    au_lc_key + AuLcSymlink_IIINFO);
-+		else if (unlikely(d_is_dir(h_dentry)))
-+			au_rw_class(&au_ii(inode)->ii_rwsem,
-+				    au_lc_key + AuLcDir_IIINFO);
-+		else /* likely */
-+			au_rw_class(&au_ii(inode)->ii_rwsem,
-+				    au_lc_key + AuLcNonDir_IIINFO);
-+
-+		ii_write_lock_new_child(inode);
-+		err = set_inode(inode, dentry);
-+		if (!err) {
-+			unlock_new_inode(inode);
-+			goto out; /* success */
-+		}
-+
-+		/*
-+		 * iget_failed() calls iput(), but we need to call
-+		 * ii_write_unlock() after iget_failed(). so dirty hack for
-+		 * i_count.
-+		 */
-+		atomic_inc(&inode->i_count);
-+		iget_failed(inode);
-+		ii_write_unlock(inode);
-+		au_xino_write(sb, bstart, h_ino, /*ino*/0);
-+		/* ignore this error */
-+		goto out_iput;
-+	} else if (!must_new && !IS_DEADDIR(inode) && inode->i_nlink) {
-+		/*
-+		 * horrible race condition between lookup, readdir and copyup
-+		 * (or something).
-+		 */
-+		if (mtx)
-+			mutex_unlock(mtx);
-+		err = reval_inode(inode, dentry);
-+		if (unlikely(err < 0)) {
-+			mtx = NULL;
-+			goto out_iput;
-+		}
-+
-+		if (!err) {
-+			mtx = NULL;
-+			goto out; /* success */
-+		} else if (mtx)
-+			mutex_lock(mtx);
-+	}
-+
-+	if (unlikely(au_test_fs_unique_ino(h_inode)))
-+		AuWarn1("Warning: Un-notified UDBA or repeatedly renamed dir,"
-+			" b%d, %s, %pd, hi%lu, i%lu.\n",
-+			bstart, au_sbtype(h_dentry->d_sb), dentry,
-+			(unsigned long)h_ino, (unsigned long)ino);
-+	ino = 0;
-+	err = au_xino_write(sb, bstart, h_ino, /*ino*/0);
-+	if (!err) {
-+		iput(inode);
-+		if (mtx)
-+			mutex_unlock(mtx);
-+		goto new_ino;
-+	}
-+
-+out_iput:
-+	iput(inode);
-+	inode = ERR_PTR(err);
-+out:
-+	if (mtx)
-+		mutex_unlock(mtx);
-+	return inode;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+int au_test_ro(struct super_block *sb, aufs_bindex_t bindex,
-+	       struct inode *inode)
-+{
-+	int err;
-+	struct inode *hi;
-+
-+	err = au_br_rdonly(au_sbr(sb, bindex));
-+
-+	/* pseudo-link after flushed may happen out of bounds */
-+	if (!err
-+	    && inode
-+	    && au_ibstart(inode) <= bindex
-+	    && bindex <= au_ibend(inode)) {
-+		/*
-+		 * permission check is unnecessary since vfsub routine
-+		 * will be called later
-+		 */
-+		hi = au_h_iptr(inode, bindex);
-+		if (hi)
-+			err = IS_IMMUTABLE(hi) ? -EROFS : 0;
-+	}
-+
-+	return err;
-+}
-+
-+int au_test_h_perm(struct inode *h_inode, int mask)
-+{
-+	if (uid_eq(current_fsuid(), GLOBAL_ROOT_UID))
-+		return 0;
-+	return inode_permission(h_inode, mask);
-+}
-+
-+int au_test_h_perm_sio(struct inode *h_inode, int mask)
-+{
-+	if (au_test_nfs(h_inode->i_sb)
-+	    && (mask & MAY_WRITE)
-+	    && S_ISDIR(h_inode->i_mode))
-+		mask |= MAY_READ; /* force permission check */
-+	return au_test_h_perm(h_inode, mask);
-+}
-diff -Nur linux-4.1.10.orig/fs/aufs/inode.h linux-4.1.10/fs/aufs/inode.h
---- linux-4.1.10.orig/fs/aufs/inode.h	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/inode.h	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,673 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * inode operations
-+ */
-+
-+#ifndef __AUFS_INODE_H__
-+#define __AUFS_INODE_H__
-+
-+#ifdef __KERNEL__
-+
-+#include <linux/fsnotify.h>
-+#include "rwsem.h"
-+
-+struct vfsmount;
-+
-+struct au_hnotify {
-+#ifdef CONFIG_AUFS_HNOTIFY
-+#ifdef CONFIG_AUFS_HFSNOTIFY
-+	/* never use fsnotify_add_vfsmount_mark() */
-+	struct fsnotify_mark		hn_mark;
-+#endif
-+	struct inode			*hn_aufs_inode;	/* no get/put */
-+#endif
-+} ____cacheline_aligned_in_smp;
-+
-+struct au_hinode {
-+	struct inode		*hi_inode;
-+	aufs_bindex_t		hi_id;
-+#ifdef CONFIG_AUFS_HNOTIFY
-+	struct au_hnotify	*hi_notify;
-+#endif
-+
-+	/* reference to the copied-up whiteout with get/put */
-+	struct dentry		*hi_whdentry;
-+};
-+
-+/* ig_flags */
-+#define AuIG_HALF_REFRESHED		1
-+#define au_ig_ftest(flags, name)	((flags) & AuIG_##name)
-+#define au_ig_fset(flags, name) \
-+	do { (flags) |= AuIG_##name; } while (0)
-+#define au_ig_fclr(flags, name) \
-+	do { (flags) &= ~AuIG_##name; } while (0)
-+
-+struct au_iigen {
-+	__u32		ig_generation, ig_flags;
-+};
-+
-+struct au_vdir;
-+struct au_iinfo {
-+	spinlock_t		ii_genspin;
-+	struct au_iigen		ii_generation;
-+	struct super_block	*ii_hsb1;	/* no get/put */
-+
-+	struct au_rwsem		ii_rwsem;
-+	aufs_bindex_t		ii_bstart, ii_bend;
-+	__u32			ii_higen;
-+	struct au_hinode	*ii_hinode;
-+	struct au_vdir		*ii_vdir;
-+};
-+
-+struct au_icntnr {
-+	struct au_iinfo iinfo;
-+	struct inode vfs_inode;
-+} ____cacheline_aligned_in_smp;
-+
-+/* au_pin flags */
-+#define AuPin_DI_LOCKED		1
-+#define AuPin_MNT_WRITE		(1 << 1)
-+#define au_ftest_pin(flags, name)	((flags) & AuPin_##name)
-+#define au_fset_pin(flags, name) \
-+	do { (flags) |= AuPin_##name; } while (0)
-+#define au_fclr_pin(flags, name) \
-+	do { (flags) &= ~AuPin_##name; } while (0)
-+
-+struct au_pin {
-+	/* input */
-+	struct dentry *dentry;
-+	unsigned int udba;
-+	unsigned char lsc_di, lsc_hi, flags;
-+	aufs_bindex_t bindex;
-+
-+	/* output */
-+	struct dentry *parent;
-+	struct au_hinode *hdir;
-+	struct vfsmount *h_mnt;
-+
-+	/* temporary unlock/relock for copyup */
-+	struct dentry *h_dentry, *h_parent;
-+	struct au_branch *br;
-+	struct task_struct *task;
-+};
-+
-+void au_pin_hdir_unlock(struct au_pin *p);
-+int au_pin_hdir_lock(struct au_pin *p);
-+int au_pin_hdir_relock(struct au_pin *p);
-+void au_pin_hdir_set_owner(struct au_pin *p, struct task_struct *task);
-+void au_pin_hdir_acquire_nest(struct au_pin *p);
-+void au_pin_hdir_release(struct au_pin *p);
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static inline struct au_iinfo *au_ii(struct inode *inode)
-+{
-+	struct au_iinfo *iinfo;
-+
-+	iinfo = &(container_of(inode, struct au_icntnr, vfs_inode)->iinfo);
-+	if (iinfo->ii_hinode)
-+		return iinfo;
-+	return NULL; /* debugging bad_inode case */
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* inode.c */
-+struct inode *au_igrab(struct inode *inode);
-+int au_refresh_hinode_self(struct inode *inode);
-+int au_refresh_hinode(struct inode *inode, struct dentry *dentry);
-+int au_ino(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
-+	   unsigned int d_type, ino_t *ino);
-+struct inode *au_new_inode(struct dentry *dentry, int must_new);
-+int au_test_ro(struct super_block *sb, aufs_bindex_t bindex,
-+	       struct inode *inode);
-+int au_test_h_perm(struct inode *h_inode, int mask);
-+int au_test_h_perm_sio(struct inode *h_inode, int mask);
-+
-+static inline int au_wh_ino(struct super_block *sb, aufs_bindex_t bindex,
-+			    ino_t h_ino, unsigned int d_type, ino_t *ino)
-+{
-+#ifdef CONFIG_AUFS_SHWH
-+	return au_ino(sb, bindex, h_ino, d_type, ino);
-+#else
-+	return 0;
-+#endif
-+}
-+
-+/* i_op.c */
-+extern struct inode_operations aufs_iop, aufs_symlink_iop, aufs_dir_iop;
-+
-+/* au_wr_dir flags */
-+#define AuWrDir_ADD_ENTRY	1
-+#define AuWrDir_ISDIR		(1 << 1)
-+#define AuWrDir_TMPFILE		(1 << 2)
-+#define au_ftest_wrdir(flags, name)	((flags) & AuWrDir_##name)
-+#define au_fset_wrdir(flags, name) \
-+	do { (flags) |= AuWrDir_##name; } while (0)
-+#define au_fclr_wrdir(flags, name) \
-+	do { (flags) &= ~AuWrDir_##name; } while (0)
-+
-+struct au_wr_dir_args {
-+	aufs_bindex_t force_btgt;
-+	unsigned char flags;
-+};
-+int au_wr_dir(struct dentry *dentry, struct dentry *src_dentry,
-+	      struct au_wr_dir_args *args);
-+
-+struct dentry *au_pinned_h_parent(struct au_pin *pin);
-+void au_pin_init(struct au_pin *pin, struct dentry *dentry,
-+		 aufs_bindex_t bindex, int lsc_di, int lsc_hi,
-+		 unsigned int udba, unsigned char flags);
-+int au_pin(struct au_pin *pin, struct dentry *dentry, aufs_bindex_t bindex,
-+	   unsigned int udba, unsigned char flags) __must_check;
-+int au_do_pin(struct au_pin *pin) __must_check;
-+void au_unpin(struct au_pin *pin);
-+int au_reval_for_attr(struct dentry *dentry, unsigned int sigen);
-+
-+#define AuIcpup_DID_CPUP	1
-+#define au_ftest_icpup(flags, name)	((flags) & AuIcpup_##name)
-+#define au_fset_icpup(flags, name) \
-+	do { (flags) |= AuIcpup_##name; } while (0)
-+#define au_fclr_icpup(flags, name) \
-+	do { (flags) &= ~AuIcpup_##name; } while (0)
-+
-+struct au_icpup_args {
-+	unsigned char flags;
-+	unsigned char pin_flags;
-+	aufs_bindex_t btgt;
-+	unsigned int udba;
-+	struct au_pin pin;
-+	struct path h_path;
-+	struct inode *h_inode;
-+};
-+
-+int au_pin_and_icpup(struct dentry *dentry, struct iattr *ia,
-+		     struct au_icpup_args *a);
-+
-+int au_h_path_getattr(struct dentry *dentry, int force, struct path *h_path);
-+
-+/* i_op_add.c */
-+int au_may_add(struct dentry *dentry, aufs_bindex_t bindex,
-+	       struct dentry *h_parent, int isdir);
-+int aufs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
-+	       dev_t dev);
-+int aufs_symlink(struct inode *dir, struct dentry *dentry, const char *symname);
-+int aufs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
-+		bool want_excl);
-+struct vfsub_aopen_args;
-+int au_aopen_or_create(struct inode *dir, struct dentry *dentry,
-+		       struct vfsub_aopen_args *args);
-+int aufs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode);
-+int aufs_link(struct dentry *src_dentry, struct inode *dir,
-+	      struct dentry *dentry);
-+int aufs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode);
-+
-+/* i_op_del.c */
-+int au_wr_dir_need_wh(struct dentry *dentry, int isdir, aufs_bindex_t *bcpup);
-+int au_may_del(struct dentry *dentry, aufs_bindex_t bindex,
-+	       struct dentry *h_parent, int isdir);
-+int aufs_unlink(struct inode *dir, struct dentry *dentry);
-+int aufs_rmdir(struct inode *dir, struct dentry *dentry);
-+
-+/* i_op_ren.c */
-+int au_wbr(struct dentry *dentry, aufs_bindex_t btgt);
-+int aufs_rename(struct inode *src_dir, struct dentry *src_dentry,
-+		struct inode *dir, struct dentry *dentry);
-+
-+/* iinfo.c */
-+struct inode *au_h_iptr(struct inode *inode, aufs_bindex_t bindex);
-+void au_hiput(struct au_hinode *hinode);
-+void au_set_hi_wh(struct inode *inode, aufs_bindex_t bindex,
-+		  struct dentry *h_wh);
-+unsigned int au_hi_flags(struct inode *inode, int isdir);
-+
-+/* hinode flags */
-+#define AuHi_XINO	1
-+#define AuHi_HNOTIFY	(1 << 1)
-+#define au_ftest_hi(flags, name)	((flags) & AuHi_##name)
-+#define au_fset_hi(flags, name) \
-+	do { (flags) |= AuHi_##name; } while (0)
-+#define au_fclr_hi(flags, name) \
-+	do { (flags) &= ~AuHi_##name; } while (0)
-+
-+#ifndef CONFIG_AUFS_HNOTIFY
-+#undef AuHi_HNOTIFY
-+#define AuHi_HNOTIFY	0
-+#endif
-+
-+void au_set_h_iptr(struct inode *inode, aufs_bindex_t bindex,
-+		   struct inode *h_inode, unsigned int flags);
-+
-+void au_update_iigen(struct inode *inode, int half);
-+void au_update_ibrange(struct inode *inode, int do_put_zero);
-+
-+void au_icntnr_init_once(void *_c);
-+int au_iinfo_init(struct inode *inode);
-+void au_iinfo_fin(struct inode *inode);
-+int au_ii_realloc(struct au_iinfo *iinfo, int nbr);
-+
-+#ifdef CONFIG_PROC_FS
-+/* plink.c */
-+int au_plink_maint(struct super_block *sb, int flags);
-+struct au_sbinfo;
-+void au_plink_maint_leave(struct au_sbinfo *sbinfo);
-+int au_plink_maint_enter(struct super_block *sb);
-+#ifdef CONFIG_AUFS_DEBUG
-+void au_plink_list(struct super_block *sb);
-+#else
-+AuStubVoid(au_plink_list, struct super_block *sb)
-+#endif
-+int au_plink_test(struct inode *inode);
-+struct dentry *au_plink_lkup(struct inode *inode, aufs_bindex_t bindex);
-+void au_plink_append(struct inode *inode, aufs_bindex_t bindex,
-+		     struct dentry *h_dentry);
-+void au_plink_put(struct super_block *sb, int verbose);
-+void au_plink_clean(struct super_block *sb, int verbose);
-+void au_plink_half_refresh(struct super_block *sb, aufs_bindex_t br_id);
-+#else
-+AuStubInt0(au_plink_maint, struct super_block *sb, int flags);
-+AuStubVoid(au_plink_maint_leave, struct au_sbinfo *sbinfo);
-+AuStubInt0(au_plink_maint_enter, struct super_block *sb);
-+AuStubVoid(au_plink_list, struct super_block *sb);
-+AuStubInt0(au_plink_test, struct inode *inode);
-+AuStub(struct dentry *, au_plink_lkup, return NULL,
-+       struct inode *inode, aufs_bindex_t bindex);
-+AuStubVoid(au_plink_append, struct inode *inode, aufs_bindex_t bindex,
-+	   struct dentry *h_dentry);
-+AuStubVoid(au_plink_put, struct super_block *sb, int verbose);
-+AuStubVoid(au_plink_clean, struct super_block *sb, int verbose);
-+AuStubVoid(au_plink_half_refresh, struct super_block *sb, aufs_bindex_t br_id);
-+#endif /* CONFIG_PROC_FS */
-+
-+#ifdef CONFIG_AUFS_XATTR
-+/* xattr.c */
-+int au_cpup_xattr(struct dentry *h_dst, struct dentry *h_src, int ignore_flags,
-+		  unsigned int verbose);
-+ssize_t aufs_listxattr(struct dentry *dentry, char *list, size_t size);
-+ssize_t aufs_getxattr(struct dentry *dentry, const char *name, void *value,
-+		      size_t size);
-+int aufs_setxattr(struct dentry *dentry, const char *name, const void *value,
-+		  size_t size, int flags);
-+int aufs_removexattr(struct dentry *dentry, const char *name);
-+
-+/* void au_xattr_init(struct super_block *sb); */
-+#else
-+AuStubInt0(au_cpup_xattr, struct dentry *h_dst, struct dentry *h_src,
-+	   int ignore_flags, unsigned int verbose);
-+/* AuStubVoid(au_xattr_init, struct super_block *sb); */
-+#endif
-+
-+#ifdef CONFIG_FS_POSIX_ACL
-+struct posix_acl *aufs_get_acl(struct inode *inode, int type);
-+int aufs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
-+#endif
-+
-+#if IS_ENABLED(CONFIG_AUFS_XATTR) || IS_ENABLED(CONFIG_FS_POSIX_ACL)
-+enum {
-+	AU_XATTR_SET,
-+	AU_XATTR_REMOVE,
-+	AU_ACL_SET
-+};
-+
-+struct au_srxattr {
-+	int type;
-+	union {
-+		struct {
-+			const char	*name;
-+			const void	*value;
-+			size_t		size;
-+			int		flags;
-+		} set;
-+		struct {
-+			const char	*name;
-+		} remove;
-+		struct {
-+			struct posix_acl *acl;
-+			int		type;
-+		} acl_set;
-+	} u;
-+};
-+ssize_t au_srxattr(struct dentry *dentry, struct au_srxattr *arg);
-+#endif
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* lock subclass for iinfo */
-+enum {
-+	AuLsc_II_CHILD,		/* child first */
-+	AuLsc_II_CHILD2,	/* rename(2), link(2), and cpup at hnotify */
-+	AuLsc_II_CHILD3,	/* copyup dirs */
-+	AuLsc_II_PARENT,	/* see AuLsc_I_PARENT in vfsub.h */
-+	AuLsc_II_PARENT2,
-+	AuLsc_II_PARENT3,	/* copyup dirs */
-+	AuLsc_II_NEW_CHILD
-+};
-+
-+/*
-+ * ii_read_lock_child, ii_write_lock_child,
-+ * ii_read_lock_child2, ii_write_lock_child2,
-+ * ii_read_lock_child3, ii_write_lock_child3,
-+ * ii_read_lock_parent, ii_write_lock_parent,
-+ * ii_read_lock_parent2, ii_write_lock_parent2,
-+ * ii_read_lock_parent3, ii_write_lock_parent3,
-+ * ii_read_lock_new_child, ii_write_lock_new_child,
-+ */
-+#define AuReadLockFunc(name, lsc) \
-+static inline void ii_read_lock_##name(struct inode *i) \
-+{ \
-+	au_rw_read_lock_nested(&au_ii(i)->ii_rwsem, AuLsc_II_##lsc); \
-+}
-+
-+#define AuWriteLockFunc(name, lsc) \
-+static inline void ii_write_lock_##name(struct inode *i) \
-+{ \
-+	au_rw_write_lock_nested(&au_ii(i)->ii_rwsem, AuLsc_II_##lsc); \
-+}
-+
-+#define AuRWLockFuncs(name, lsc) \
-+	AuReadLockFunc(name, lsc) \
-+	AuWriteLockFunc(name, lsc)
-+
-+AuRWLockFuncs(child, CHILD);
-+AuRWLockFuncs(child2, CHILD2);
-+AuRWLockFuncs(child3, CHILD3);
-+AuRWLockFuncs(parent, PARENT);
-+AuRWLockFuncs(parent2, PARENT2);
-+AuRWLockFuncs(parent3, PARENT3);
-+AuRWLockFuncs(new_child, NEW_CHILD);
-+
-+#undef AuReadLockFunc
-+#undef AuWriteLockFunc
-+#undef AuRWLockFuncs
-+
-+/*
-+ * ii_read_unlock, ii_write_unlock, ii_downgrade_lock
-+ */
-+AuSimpleUnlockRwsemFuncs(ii, struct inode *i, &au_ii(i)->ii_rwsem);
-+
-+#define IiMustNoWaiters(i)	AuRwMustNoWaiters(&au_ii(i)->ii_rwsem)
-+#define IiMustAnyLock(i)	AuRwMustAnyLock(&au_ii(i)->ii_rwsem)
-+#define IiMustWriteLock(i)	AuRwMustWriteLock(&au_ii(i)->ii_rwsem)
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static inline void au_icntnr_init(struct au_icntnr *c)
-+{
-+#ifdef CONFIG_AUFS_DEBUG
-+	c->vfs_inode.i_mode = 0;
-+#endif
-+}
-+
-+static inline unsigned int au_iigen(struct inode *inode, struct au_iigen *iigen)
-+{
-+	unsigned int gen;
-+	struct au_iinfo *iinfo;
-+
-+	iinfo = au_ii(inode);
-+	spin_lock(&iinfo->ii_genspin);
-+	if (iigen)
-+		*iigen = iinfo->ii_generation;
-+	gen = iinfo->ii_generation.ig_generation;
-+	spin_unlock(&iinfo->ii_genspin);
-+
-+	return gen;
-+}
-+
-+/* tiny test for inode number */
-+/* tmpfs generation is too rough */
-+static inline int au_test_higen(struct inode *inode, struct inode *h_inode)
-+{
-+	struct au_iinfo *iinfo;
-+
-+	iinfo = au_ii(inode);
-+	AuRwMustAnyLock(&iinfo->ii_rwsem);
-+	return !(iinfo->ii_hsb1 == h_inode->i_sb
-+		 && iinfo->ii_higen == h_inode->i_generation);
-+}
-+
-+static inline void au_iigen_dec(struct inode *inode)
-+{
-+	struct au_iinfo *iinfo;
-+
-+	iinfo = au_ii(inode);
-+	spin_lock(&iinfo->ii_genspin);
-+	iinfo->ii_generation.ig_generation--;
-+	spin_unlock(&iinfo->ii_genspin);
-+}
-+
-+static inline int au_iigen_test(struct inode *inode, unsigned int sigen)
-+{
-+	int err;
-+
-+	err = 0;
-+	if (unlikely(inode && au_iigen(inode, NULL) != sigen))
-+		err = -EIO;
-+
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static inline aufs_bindex_t au_ii_br_id(struct inode *inode,
-+					aufs_bindex_t bindex)
-+{
-+	IiMustAnyLock(inode);
-+	return au_ii(inode)->ii_hinode[0 + bindex].hi_id;
-+}
-+
-+static inline aufs_bindex_t au_ibstart(struct inode *inode)
-+{
-+	IiMustAnyLock(inode);
-+	return au_ii(inode)->ii_bstart;
-+}
-+
-+static inline aufs_bindex_t au_ibend(struct inode *inode)
-+{
-+	IiMustAnyLock(inode);
-+	return au_ii(inode)->ii_bend;
-+}
-+
-+static inline struct au_vdir *au_ivdir(struct inode *inode)
-+{
-+	IiMustAnyLock(inode);
-+	return au_ii(inode)->ii_vdir;
-+}
-+
-+static inline struct dentry *au_hi_wh(struct inode *inode, aufs_bindex_t bindex)
-+{
-+	IiMustAnyLock(inode);
-+	return au_ii(inode)->ii_hinode[0 + bindex].hi_whdentry;
-+}
-+
-+static inline void au_set_ibstart(struct inode *inode, aufs_bindex_t bindex)
-+{
-+	IiMustWriteLock(inode);
-+	au_ii(inode)->ii_bstart = bindex;
-+}
-+
-+static inline void au_set_ibend(struct inode *inode, aufs_bindex_t bindex)
-+{
-+	IiMustWriteLock(inode);
-+	au_ii(inode)->ii_bend = bindex;
-+}
-+
-+static inline void au_set_ivdir(struct inode *inode, struct au_vdir *vdir)
-+{
-+	IiMustWriteLock(inode);
-+	au_ii(inode)->ii_vdir = vdir;
-+}
-+
-+static inline struct au_hinode *au_hi(struct inode *inode, aufs_bindex_t bindex)
-+{
-+	IiMustAnyLock(inode);
-+	return au_ii(inode)->ii_hinode + bindex;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static inline struct dentry *au_pinned_parent(struct au_pin *pin)
-+{
-+	if (pin)
-+		return pin->parent;
-+	return NULL;
-+}
-+
-+static inline struct inode *au_pinned_h_dir(struct au_pin *pin)
-+{
-+	if (pin && pin->hdir)
-+		return pin->hdir->hi_inode;
-+	return NULL;
-+}
-+
-+static inline struct au_hinode *au_pinned_hdir(struct au_pin *pin)
-+{
-+	if (pin)
-+		return pin->hdir;
-+	return NULL;
-+}
-+
-+static inline void au_pin_set_dentry(struct au_pin *pin, struct dentry *dentry)
-+{
-+	if (pin)
-+		pin->dentry = dentry;
-+}
-+
-+static inline void au_pin_set_parent_lflag(struct au_pin *pin,
-+					   unsigned char lflag)
-+{
-+	if (pin) {
-+		if (lflag)
-+			au_fset_pin(pin->flags, DI_LOCKED);
-+		else
-+			au_fclr_pin(pin->flags, DI_LOCKED);
-+	}
-+}
-+
-+#if 0 /* reserved */
-+static inline void au_pin_set_parent(struct au_pin *pin, struct dentry *parent)
-+{
-+	if (pin) {
-+		dput(pin->parent);
-+		pin->parent = dget(parent);
-+	}
-+}
-+#endif
-+
-+/* ---------------------------------------------------------------------- */
-+
-+struct au_branch;
-+#ifdef CONFIG_AUFS_HNOTIFY
-+struct au_hnotify_op {
-+	void (*ctl)(struct au_hinode *hinode, int do_set);
-+	int (*alloc)(struct au_hinode *hinode);
-+
-+	/*
-+	 * if it returns true, the the caller should free hinode->hi_notify,
-+	 * otherwise ->free() frees it.
-+	 */
-+	int (*free)(struct au_hinode *hinode,
-+		    struct au_hnotify *hn) __must_check;
-+
-+	void (*fin)(void);
-+	int (*init)(void);
-+
-+	int (*reset_br)(unsigned int udba, struct au_branch *br, int perm);
-+	void (*fin_br)(struct au_branch *br);
-+	int (*init_br)(struct au_branch *br, int perm);
-+};
-+
-+/* hnotify.c */
-+int au_hn_alloc(struct au_hinode *hinode, struct inode *inode);
-+void au_hn_free(struct au_hinode *hinode);
-+void au_hn_ctl(struct au_hinode *hinode, int do_set);
-+void au_hn_reset(struct inode *inode, unsigned int flags);
-+int au_hnotify(struct inode *h_dir, struct au_hnotify *hnotify, u32 mask,
-+	       struct qstr *h_child_qstr, struct inode *h_child_inode);
-+int au_hnotify_reset_br(unsigned int udba, struct au_branch *br, int perm);
-+int au_hnotify_init_br(struct au_branch *br, int perm);
-+void au_hnotify_fin_br(struct au_branch *br);
-+int __init au_hnotify_init(void);
-+void au_hnotify_fin(void);
-+
-+/* hfsnotify.c */
-+extern const struct au_hnotify_op au_hnotify_op;
-+
-+static inline
-+void au_hn_init(struct au_hinode *hinode)
-+{
-+	hinode->hi_notify = NULL;
-+}
-+
-+static inline struct au_hnotify *au_hn(struct au_hinode *hinode)
-+{
-+	return hinode->hi_notify;
-+}
-+
-+#else
-+AuStub(int, au_hn_alloc, return -EOPNOTSUPP,
-+       struct au_hinode *hinode __maybe_unused,
-+       struct inode *inode __maybe_unused)
-+AuStub(struct au_hnotify *, au_hn, return NULL, struct au_hinode *hinode)
-+AuStubVoid(au_hn_free, struct au_hinode *hinode __maybe_unused)
-+AuStubVoid(au_hn_ctl, struct au_hinode *hinode __maybe_unused,
-+	   int do_set __maybe_unused)
-+AuStubVoid(au_hn_reset, struct inode *inode __maybe_unused,
-+	   unsigned int flags __maybe_unused)
-+AuStubInt0(au_hnotify_reset_br, unsigned int udba __maybe_unused,
-+	   struct au_branch *br __maybe_unused,
-+	   int perm __maybe_unused)
-+AuStubInt0(au_hnotify_init_br, struct au_branch *br __maybe_unused,
-+	   int perm __maybe_unused)
-+AuStubVoid(au_hnotify_fin_br, struct au_branch *br __maybe_unused)
-+AuStubInt0(__init au_hnotify_init, void)
-+AuStubVoid(au_hnotify_fin, void)
-+AuStubVoid(au_hn_init, struct au_hinode *hinode __maybe_unused)
-+#endif /* CONFIG_AUFS_HNOTIFY */
-+
-+static inline void au_hn_suspend(struct au_hinode *hdir)
-+{
-+	au_hn_ctl(hdir, /*do_set*/0);
-+}
-+
-+static inline void au_hn_resume(struct au_hinode *hdir)
-+{
-+	au_hn_ctl(hdir, /*do_set*/1);
-+}
-+
-+static inline void au_hn_imtx_lock(struct au_hinode *hdir)
-+{
-+	mutex_lock(&hdir->hi_inode->i_mutex);
-+	au_hn_suspend(hdir);
-+}
-+
-+static inline void au_hn_imtx_lock_nested(struct au_hinode *hdir,
-+					  unsigned int sc __maybe_unused)
-+{
-+	mutex_lock_nested(&hdir->hi_inode->i_mutex, sc);
-+	au_hn_suspend(hdir);
-+}
-+
-+static inline void au_hn_imtx_unlock(struct au_hinode *hdir)
-+{
-+	au_hn_resume(hdir);
-+	mutex_unlock(&hdir->hi_inode->i_mutex);
-+}
-+
-+#endif /* __KERNEL__ */
-+#endif /* __AUFS_INODE_H__ */
-diff -Nur linux-4.1.10.orig/fs/aufs/ioctl.c linux-4.1.10/fs/aufs/ioctl.c
---- linux-4.1.10.orig/fs/aufs/ioctl.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/ioctl.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,219 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * ioctl
-+ * plink-management and readdir in userspace.
-+ * assist the pathconf(3) wrapper library.
-+ * move-down
-+ * File-based Hierarchical Storage Management.
-+ */
-+
-+#include <linux/compat.h>
-+#include <linux/file.h>
-+#include "aufs.h"
-+
-+static int au_wbr_fd(struct path *path, struct aufs_wbr_fd __user *arg)
-+{
-+	int err, fd;
-+	aufs_bindex_t wbi, bindex, bend;
-+	struct file *h_file;
-+	struct super_block *sb;
-+	struct dentry *root;
-+	struct au_branch *br;
-+	struct aufs_wbr_fd wbrfd = {
-+		.oflags	= au_dir_roflags,
-+		.brid	= -1
-+	};
-+	const int valid = O_RDONLY | O_NONBLOCK | O_LARGEFILE | O_DIRECTORY
-+		| O_NOATIME | O_CLOEXEC;
-+
-+	AuDebugOn(wbrfd.oflags & ~valid);
-+
-+	if (arg) {
-+		err = copy_from_user(&wbrfd, arg, sizeof(wbrfd));
-+		if (unlikely(err)) {
-+			err = -EFAULT;
-+			goto out;
-+		}
-+
-+		err = -EINVAL;
-+		AuDbg("wbrfd{0%o, %d}\n", wbrfd.oflags, wbrfd.brid);
-+		wbrfd.oflags |= au_dir_roflags;
-+		AuDbg("0%o\n", wbrfd.oflags);
-+		if (unlikely(wbrfd.oflags & ~valid))
-+			goto out;
-+	}
-+
-+	fd = get_unused_fd_flags(0);
-+	err = fd;
-+	if (unlikely(fd < 0))
-+		goto out;
-+
-+	h_file = ERR_PTR(-EINVAL);
-+	wbi = 0;
-+	br = NULL;
-+	sb = path->dentry->d_sb;
-+	root = sb->s_root;
-+	aufs_read_lock(root, AuLock_IR);
-+	bend = au_sbend(sb);
-+	if (wbrfd.brid >= 0) {
-+		wbi = au_br_index(sb, wbrfd.brid);
-+		if (unlikely(wbi < 0 || wbi > bend))
-+			goto out_unlock;
-+	}
-+
-+	h_file = ERR_PTR(-ENOENT);
-+	br = au_sbr(sb, wbi);
-+	if (!au_br_writable(br->br_perm)) {
-+		if (arg)
-+			goto out_unlock;
-+
-+		bindex = wbi + 1;
-+		wbi = -1;
-+		for (; bindex <= bend; bindex++) {
-+			br = au_sbr(sb, bindex);
-+			if (au_br_writable(br->br_perm)) {
-+				wbi = bindex;
-+				br = au_sbr(sb, wbi);
-+				break;
-+			}
-+		}
-+	}
-+	AuDbg("wbi %d\n", wbi);
-+	if (wbi >= 0)
-+		h_file = au_h_open(root, wbi, wbrfd.oflags, NULL,
-+				   /*force_wr*/0);
-+
-+out_unlock:
-+	aufs_read_unlock(root, AuLock_IR);
-+	err = PTR_ERR(h_file);
-+	if (IS_ERR(h_file))
-+		goto out_fd;
-+
-+	atomic_dec(&br->br_count); /* cf. au_h_open() */
-+	fd_install(fd, h_file);
-+	err = fd;
-+	goto out; /* success */
-+
-+out_fd:
-+	put_unused_fd(fd);
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+long aufs_ioctl_dir(struct file *file, unsigned int cmd, unsigned long arg)
-+{
-+	long err;
-+	struct dentry *dentry;
-+
-+	switch (cmd) {
-+	case AUFS_CTL_RDU:
-+	case AUFS_CTL_RDU_INO:
-+		err = au_rdu_ioctl(file, cmd, arg);
-+		break;
-+
-+	case AUFS_CTL_WBR_FD:
-+		err = au_wbr_fd(&file->f_path, (void __user *)arg);
-+		break;
-+
-+	case AUFS_CTL_IBUSY:
-+		err = au_ibusy_ioctl(file, arg);
-+		break;
-+
-+	case AUFS_CTL_BRINFO:
-+		err = au_brinfo_ioctl(file, arg);
-+		break;
-+
-+	case AUFS_CTL_FHSM_FD:
-+		dentry = file->f_path.dentry;
-+		if (IS_ROOT(dentry))
-+			err = au_fhsm_fd(dentry->d_sb, arg);
-+		else
-+			err = -ENOTTY;
-+		break;
-+
-+	default:
-+		/* do not call the lower */
-+		AuDbg("0x%x\n", cmd);
-+		err = -ENOTTY;
-+	}
-+
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+long aufs_ioctl_nondir(struct file *file, unsigned int cmd, unsigned long arg)
-+{
-+	long err;
-+
-+	switch (cmd) {
-+	case AUFS_CTL_MVDOWN:
-+		err = au_mvdown(file->f_path.dentry, (void __user *)arg);
-+		break;
-+
-+	case AUFS_CTL_WBR_FD:
-+		err = au_wbr_fd(&file->f_path, (void __user *)arg);
-+		break;
-+
-+	default:
-+		/* do not call the lower */
-+		AuDbg("0x%x\n", cmd);
-+		err = -ENOTTY;
-+	}
-+
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+#ifdef CONFIG_COMPAT
-+long aufs_compat_ioctl_dir(struct file *file, unsigned int cmd,
-+			   unsigned long arg)
-+{
-+	long err;
-+
-+	switch (cmd) {
-+	case AUFS_CTL_RDU:
-+	case AUFS_CTL_RDU_INO:
-+		err = au_rdu_compat_ioctl(file, cmd, arg);
-+		break;
-+
-+	case AUFS_CTL_IBUSY:
-+		err = au_ibusy_compat_ioctl(file, arg);
-+		break;
-+
-+	case AUFS_CTL_BRINFO:
-+		err = au_brinfo_compat_ioctl(file, arg);
-+		break;
-+
-+	default:
-+		err = aufs_ioctl_dir(file, cmd, arg);
-+	}
-+
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+long aufs_compat_ioctl_nondir(struct file *file, unsigned int cmd,
-+			      unsigned long arg)
-+{
-+	return aufs_ioctl_nondir(file, cmd, (unsigned long)compat_ptr(arg));
-+}
-+#endif
-diff -Nur linux-4.1.10.orig/fs/aufs/i_op_add.c linux-4.1.10/fs/aufs/i_op_add.c
---- linux-4.1.10.orig/fs/aufs/i_op_add.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/i_op_add.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,932 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * inode operations (add entry)
-+ */
-+
-+#include "aufs.h"
-+
-+/*
-+ * final procedure of adding a new entry, except link(2).
-+ * remove whiteout, instantiate, copyup the parent dir's times and size
-+ * and update version.
-+ * if it failed, re-create the removed whiteout.
-+ */
-+static int epilog(struct inode *dir, aufs_bindex_t bindex,
-+		  struct dentry *wh_dentry, struct dentry *dentry)
-+{
-+	int err, rerr;
-+	aufs_bindex_t bwh;
-+	struct path h_path;
-+	struct super_block *sb;
-+	struct inode *inode, *h_dir;
-+	struct dentry *wh;
-+
-+	bwh = -1;
-+	sb = dir->i_sb;
-+	if (wh_dentry) {
-+		h_dir = d_inode(wh_dentry->d_parent); /* dir inode is locked */
-+		IMustLock(h_dir);
-+		AuDebugOn(au_h_iptr(dir, bindex) != h_dir);
-+		bwh = au_dbwh(dentry);
-+		h_path.dentry = wh_dentry;
-+		h_path.mnt = au_sbr_mnt(sb, bindex);
-+		err = au_wh_unlink_dentry(au_h_iptr(dir, bindex), &h_path,
-+					  dentry);
-+		if (unlikely(err))
-+			goto out;
-+	}
-+
-+	inode = au_new_inode(dentry, /*must_new*/1);
-+	if (!IS_ERR(inode)) {
-+		d_instantiate(dentry, inode);
-+		dir = d_inode(dentry->d_parent); /* dir inode is locked */
-+		IMustLock(dir);
-+		au_dir_ts(dir, bindex);
-+		dir->i_version++;
-+		au_fhsm_wrote(sb, bindex, /*force*/0);
-+		return 0; /* success */
-+	}
-+
-+	err = PTR_ERR(inode);
-+	if (!wh_dentry)
-+		goto out;
-+
-+	/* revert */
-+	/* dir inode is locked */
-+	wh = au_wh_create(dentry, bwh, wh_dentry->d_parent);
-+	rerr = PTR_ERR(wh);
-+	if (IS_ERR(wh)) {
-+		AuIOErr("%pd reverting whiteout failed(%d, %d)\n",
-+			dentry, err, rerr);
-+		err = -EIO;
-+	} else
-+		dput(wh);
-+
-+out:
-+	return err;
-+}
-+
-+static int au_d_may_add(struct dentry *dentry)
-+{
-+	int err;
-+
-+	err = 0;
-+	if (unlikely(d_unhashed(dentry)))
-+		err = -ENOENT;
-+	if (unlikely(d_really_is_positive(dentry)))
-+		err = -EEXIST;
-+	return err;
-+}
-+
-+/*
-+ * simple tests for the adding inode operations.
-+ * following the checks in vfs, plus the parent-child relationship.
-+ */
-+int au_may_add(struct dentry *dentry, aufs_bindex_t bindex,
-+	       struct dentry *h_parent, int isdir)
-+{
-+	int err;
-+	umode_t h_mode;
-+	struct dentry *h_dentry;
-+	struct inode *h_inode;
-+
-+	err = -ENAMETOOLONG;
-+	if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN))
-+		goto out;
-+
-+	h_dentry = au_h_dptr(dentry, bindex);
-+	if (d_really_is_negative(dentry)) {
-+		err = -EEXIST;
-+		if (unlikely(d_is_positive(h_dentry)))
-+			goto out;
-+	} else {
-+		/* rename(2) case */
-+		err = -EIO;
-+		if (unlikely(d_is_negative(h_dentry)))
-+			goto out;
-+		h_inode = d_inode(h_dentry);
-+		if (unlikely(!h_inode->i_nlink))
-+			goto out;
-+
-+		h_mode = h_inode->i_mode;
-+		if (!isdir) {
-+			err = -EISDIR;
-+			if (unlikely(S_ISDIR(h_mode)))
-+				goto out;
-+		} else if (unlikely(!S_ISDIR(h_mode))) {
-+			err = -ENOTDIR;
-+			goto out;
-+		}
-+	}
-+
-+	err = 0;
-+	/* expected parent dir is locked */
-+	if (unlikely(h_parent != h_dentry->d_parent))
-+		err = -EIO;
-+
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+/*
-+ * initial procedure of adding a new entry.
-+ * prepare writable branch and the parent dir, lock it,
-+ * and lookup whiteout for the new entry.
-+ */
-+static struct dentry*
-+lock_hdir_lkup_wh(struct dentry *dentry, struct au_dtime *dt,
-+		  struct dentry *src_dentry, struct au_pin *pin,
-+		  struct au_wr_dir_args *wr_dir_args)
-+{
-+	struct dentry *wh_dentry, *h_parent;
-+	struct super_block *sb;
-+	struct au_branch *br;
-+	int err;
-+	unsigned int udba;
-+	aufs_bindex_t bcpup;
-+
-+	AuDbg("%pd\n", dentry);
-+
-+	err = au_wr_dir(dentry, src_dentry, wr_dir_args);
-+	bcpup = err;
-+	wh_dentry = ERR_PTR(err);
-+	if (unlikely(err < 0))
-+		goto out;
-+
-+	sb = dentry->d_sb;
-+	udba = au_opt_udba(sb);
-+	err = au_pin(pin, dentry, bcpup, udba,
-+		     AuPin_DI_LOCKED | AuPin_MNT_WRITE);
-+	wh_dentry = ERR_PTR(err);
-+	if (unlikely(err))
-+		goto out;
-+
-+	h_parent = au_pinned_h_parent(pin);
-+	if (udba != AuOpt_UDBA_NONE
-+	    && au_dbstart(dentry) == bcpup)
-+		err = au_may_add(dentry, bcpup, h_parent,
-+				 au_ftest_wrdir(wr_dir_args->flags, ISDIR));
-+	else if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN))
-+		err = -ENAMETOOLONG;
-+	wh_dentry = ERR_PTR(err);
-+	if (unlikely(err))
-+		goto out_unpin;
-+
-+	br = au_sbr(sb, bcpup);
-+	if (dt) {
-+		struct path tmp = {
-+			.dentry	= h_parent,
-+			.mnt	= au_br_mnt(br)
-+		};
-+		au_dtime_store(dt, au_pinned_parent(pin), &tmp);
-+	}
-+
-+	wh_dentry = NULL;
-+	if (bcpup != au_dbwh(dentry))
-+		goto out; /* success */
-+
-+	/*
-+	 * ENAMETOOLONG here means that if we allowed create such name, then it
-+	 * would not be able to removed in the future. So we don't allow such
-+	 * name here and we don't handle ENAMETOOLONG differently here.
-+	 */
-+	wh_dentry = au_wh_lkup(h_parent, &dentry->d_name, br);
-+
-+out_unpin:
-+	if (IS_ERR(wh_dentry))
-+		au_unpin(pin);
-+out:
-+	return wh_dentry;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+enum { Mknod, Symlink, Creat };
-+struct simple_arg {
-+	int type;
-+	union {
-+		struct {
-+			umode_t			mode;
-+			bool			want_excl;
-+			bool			try_aopen;
-+			struct vfsub_aopen_args	*aopen;
-+		} c;
-+		struct {
-+			const char *symname;
-+		} s;
-+		struct {
-+			umode_t mode;
-+			dev_t dev;
-+		} m;
-+	} u;
-+};
-+
-+static int add_simple(struct inode *dir, struct dentry *dentry,
-+		      struct simple_arg *arg)
-+{
-+	int err, rerr;
-+	aufs_bindex_t bstart;
-+	unsigned char created;
-+	const unsigned char try_aopen
-+		= (arg->type == Creat && arg->u.c.try_aopen);
-+	struct dentry *wh_dentry, *parent;
-+	struct inode *h_dir;
-+	struct super_block *sb;
-+	struct au_branch *br;
-+	/* to reuduce stack size */
-+	struct {
-+		struct au_dtime dt;
-+		struct au_pin pin;
-+		struct path h_path;
-+		struct au_wr_dir_args wr_dir_args;
-+	} *a;
-+
-+	AuDbg("%pd\n", dentry);
-+	IMustLock(dir);
-+
-+	err = -ENOMEM;
-+	a = kmalloc(sizeof(*a), GFP_NOFS);
-+	if (unlikely(!a))
-+		goto out;
-+	a->wr_dir_args.force_btgt = -1;
-+	a->wr_dir_args.flags = AuWrDir_ADD_ENTRY;
-+
-+	parent = dentry->d_parent; /* dir inode is locked */
-+	if (!try_aopen) {
-+		err = aufs_read_lock(dentry, AuLock_DW | AuLock_GEN);
-+		if (unlikely(err))
-+			goto out_free;
-+	}
-+	err = au_d_may_add(dentry);
-+	if (unlikely(err))
-+		goto out_unlock;
-+	if (!try_aopen)
-+		di_write_lock_parent(parent);
-+	wh_dentry = lock_hdir_lkup_wh(dentry, &a->dt, /*src_dentry*/NULL,
-+				      &a->pin, &a->wr_dir_args);
-+	err = PTR_ERR(wh_dentry);
-+	if (IS_ERR(wh_dentry))
-+		goto out_parent;
-+
-+	bstart = au_dbstart(dentry);
-+	sb = dentry->d_sb;
-+	br = au_sbr(sb, bstart);
-+	a->h_path.dentry = au_h_dptr(dentry, bstart);
-+	a->h_path.mnt = au_br_mnt(br);
-+	h_dir = au_pinned_h_dir(&a->pin);
-+	switch (arg->type) {
-+	case Creat:
-+		err = 0;
-+		if (!try_aopen || !h_dir->i_op->atomic_open)
-+			err = vfsub_create(h_dir, &a->h_path, arg->u.c.mode,
-+					   arg->u.c.want_excl);
-+		else
-+			err = vfsub_atomic_open(h_dir, a->h_path.dentry,
-+						arg->u.c.aopen, br);
-+		break;
-+	case Symlink:
-+		err = vfsub_symlink(h_dir, &a->h_path, arg->u.s.symname);
-+		break;
-+	case Mknod:
-+		err = vfsub_mknod(h_dir, &a->h_path, arg->u.m.mode,
-+				  arg->u.m.dev);
-+		break;
-+	default:
-+		BUG();
-+	}
-+	created = !err;
-+	if (!err)
-+		err = epilog(dir, bstart, wh_dentry, dentry);
-+
-+	/* revert */
-+	if (unlikely(created && err && d_is_positive(a->h_path.dentry))) {
-+		/* no delegation since it is just created */
-+		rerr = vfsub_unlink(h_dir, &a->h_path, /*delegated*/NULL,
-+				    /*force*/0);
-+		if (rerr) {
-+			AuIOErr("%pd revert failure(%d, %d)\n",
-+				dentry, err, rerr);
-+			err = -EIO;
-+		}
-+		au_dtime_revert(&a->dt);
-+	}
-+
-+	if (!err && try_aopen && !h_dir->i_op->atomic_open)
-+		*arg->u.c.aopen->opened |= FILE_CREATED;
-+
-+	au_unpin(&a->pin);
-+	dput(wh_dentry);
-+
-+out_parent:
-+	if (!try_aopen)
-+		di_write_unlock(parent);
-+out_unlock:
-+	if (unlikely(err)) {
-+		au_update_dbstart(dentry);
-+		d_drop(dentry);
-+	}
-+	if (!try_aopen)
-+		aufs_read_unlock(dentry, AuLock_DW);
-+out_free:
-+	kfree(a);
-+out:
-+	return err;
-+}
-+
-+int aufs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
-+	       dev_t dev)
-+{
-+	struct simple_arg arg = {
-+		.type = Mknod,
-+		.u.m = {
-+			.mode	= mode,
-+			.dev	= dev
-+		}
-+	};
-+	return add_simple(dir, dentry, &arg);
-+}
-+
-+int aufs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
-+{
-+	struct simple_arg arg = {
-+		.type = Symlink,
-+		.u.s.symname = symname
-+	};
-+	return add_simple(dir, dentry, &arg);
-+}
-+
-+int aufs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
-+		bool want_excl)
-+{
-+	struct simple_arg arg = {
-+		.type = Creat,
-+		.u.c = {
-+			.mode		= mode,
-+			.want_excl	= want_excl
-+		}
-+	};
-+	return add_simple(dir, dentry, &arg);
-+}
-+
-+int au_aopen_or_create(struct inode *dir, struct dentry *dentry,
-+		       struct vfsub_aopen_args *aopen_args)
-+{
-+	struct simple_arg arg = {
-+		.type = Creat,
-+		.u.c = {
-+			.mode		= aopen_args->create_mode,
-+			.want_excl	= aopen_args->open_flag & O_EXCL,
-+			.try_aopen	= true,
-+			.aopen		= aopen_args
-+		}
-+	};
-+	return add_simple(dir, dentry, &arg);
-+}
-+
-+int aufs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
-+{
-+	int err;
-+	aufs_bindex_t bindex;
-+	struct super_block *sb;
-+	struct dentry *parent, *h_parent, *h_dentry;
-+	struct inode *h_dir, *inode;
-+	struct vfsmount *h_mnt;
-+	struct au_wr_dir_args wr_dir_args = {
-+		.force_btgt	= -1,
-+		.flags		= AuWrDir_TMPFILE
-+	};
-+
-+	/* copy-up may happen */
-+	mutex_lock(&dir->i_mutex);
-+
-+	sb = dir->i_sb;
-+	err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM);
-+	if (unlikely(err))
-+		goto out;
-+
-+	err = au_di_init(dentry);
-+	if (unlikely(err))
-+		goto out_si;
-+
-+	err = -EBUSY;
-+	parent = d_find_any_alias(dir);
-+	AuDebugOn(!parent);
-+	di_write_lock_parent(parent);
-+	if (unlikely(d_inode(parent) != dir))
-+		goto out_parent;
-+
-+	err = au_digen_test(parent, au_sigen(sb));
-+	if (unlikely(err))
-+		goto out_parent;
-+
-+	bindex = au_dbstart(parent);
-+	au_set_dbstart(dentry, bindex);
-+	au_set_dbend(dentry, bindex);
-+	err = au_wr_dir(dentry, /*src_dentry*/NULL, &wr_dir_args);
-+	bindex = err;
-+	if (unlikely(err < 0))
-+		goto out_parent;
-+
-+	err = -EOPNOTSUPP;
-+	h_dir = au_h_iptr(dir, bindex);
-+	if (unlikely(!h_dir->i_op->tmpfile))
-+		goto out_parent;
-+
-+	h_mnt = au_sbr_mnt(sb, bindex);
-+	err = vfsub_mnt_want_write(h_mnt);
-+	if (unlikely(err))
-+		goto out_parent;
-+
-+	h_parent = au_h_dptr(parent, bindex);
-+	err = inode_permission(d_inode(h_parent), MAY_WRITE | MAY_EXEC);
-+	if (unlikely(err))
-+		goto out_mnt;
-+
-+	err = -ENOMEM;
-+	h_dentry = d_alloc(h_parent, &dentry->d_name);
-+	if (unlikely(!h_dentry))
-+		goto out_mnt;
-+
-+	err = h_dir->i_op->tmpfile(h_dir, h_dentry, mode);
-+	if (unlikely(err))
-+		goto out_dentry;
-+
-+	au_set_dbstart(dentry, bindex);
-+	au_set_dbend(dentry, bindex);
-+	au_set_h_dptr(dentry, bindex, dget(h_dentry));
-+	inode = au_new_inode(dentry, /*must_new*/1);
-+	if (IS_ERR(inode)) {
-+		err = PTR_ERR(inode);
-+		au_set_h_dptr(dentry, bindex, NULL);
-+		au_set_dbstart(dentry, -1);
-+		au_set_dbend(dentry, -1);
-+	} else {
-+		if (!inode->i_nlink)
-+			set_nlink(inode, 1);
-+		d_tmpfile(dentry, inode);
-+		au_di(dentry)->di_tmpfile = 1;
-+
-+		/* update without i_mutex */
-+		if (au_ibstart(dir) == au_dbstart(dentry))
-+			au_cpup_attr_timesizes(dir);
-+	}
-+
-+out_dentry:
-+	dput(h_dentry);
-+out_mnt:
-+	vfsub_mnt_drop_write(h_mnt);
-+out_parent:
-+	di_write_unlock(parent);
-+	dput(parent);
-+	di_write_unlock(dentry);
-+	if (!err)
-+#if 0
-+		/* verbose coding for lock class name */
-+		au_rw_class(&au_di(dentry)->di_rwsem,
-+			    au_lc_key + AuLcNonDir_DIINFO);
-+#else
-+		;
-+#endif
-+	else {
-+		au_di_fin(dentry);
-+		dentry->d_fsdata = NULL;
-+	}
-+out_si:
-+	si_read_unlock(sb);
-+out:
-+	mutex_unlock(&dir->i_mutex);
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+struct au_link_args {
-+	aufs_bindex_t bdst, bsrc;
-+	struct au_pin pin;
-+	struct path h_path;
-+	struct dentry *src_parent, *parent;
-+};
-+
-+static int au_cpup_before_link(struct dentry *src_dentry,
-+			       struct au_link_args *a)
-+{
-+	int err;
-+	struct dentry *h_src_dentry;
-+	struct au_cp_generic cpg = {
-+		.dentry	= src_dentry,
-+		.bdst	= a->bdst,
-+		.bsrc	= a->bsrc,
-+		.len	= -1,
-+		.pin	= &a->pin,
-+		.flags	= AuCpup_DTIME | AuCpup_HOPEN /* | AuCpup_KEEPLINO */
-+	};
-+
-+	di_read_lock_parent(a->src_parent, AuLock_IR);
-+	err = au_test_and_cpup_dirs(src_dentry, a->bdst);
-+	if (unlikely(err))
-+		goto out;
-+
-+	h_src_dentry = au_h_dptr(src_dentry, a->bsrc);
-+	err = au_pin(&a->pin, src_dentry, a->bdst,
-+		     au_opt_udba(src_dentry->d_sb),
-+		     AuPin_DI_LOCKED | AuPin_MNT_WRITE);
-+	if (unlikely(err))
-+		goto out;
-+
-+	err = au_sio_cpup_simple(&cpg);
-+	au_unpin(&a->pin);
-+
-+out:
-+	di_read_unlock(a->src_parent, AuLock_IR);
-+	return err;
-+}
-+
-+static int au_cpup_or_link(struct dentry *src_dentry, struct dentry *dentry,
-+			   struct au_link_args *a)
-+{
-+	int err;
-+	unsigned char plink;
-+	aufs_bindex_t bend;
-+	struct dentry *h_src_dentry;
-+	struct inode *h_inode, *inode, *delegated;
-+	struct super_block *sb;
-+	struct file *h_file;
-+
-+	plink = 0;
-+	h_inode = NULL;
-+	sb = src_dentry->d_sb;
-+	inode = d_inode(src_dentry);
-+	if (au_ibstart(inode) <= a->bdst)
-+		h_inode = au_h_iptr(inode, a->bdst);
-+	if (!h_inode || !h_inode->i_nlink) {
-+		/* copyup src_dentry as the name of dentry. */
-+		bend = au_dbend(dentry);
-+		if (bend < a->bsrc)
-+			au_set_dbend(dentry, a->bsrc);
-+		au_set_h_dptr(dentry, a->bsrc,
-+			      dget(au_h_dptr(src_dentry, a->bsrc)));
-+		dget(a->h_path.dentry);
-+		au_set_h_dptr(dentry, a->bdst, NULL);
-+		AuDbg("temporary d_inode...\n");
-+		spin_lock(&dentry->d_lock);
-+		dentry->d_inode = d_inode(src_dentry); /* tmp */
-+		spin_unlock(&dentry->d_lock);
-+		h_file = au_h_open_pre(dentry, a->bsrc, /*force_wr*/0);
-+		if (IS_ERR(h_file))
-+			err = PTR_ERR(h_file);
-+		else {
-+			struct au_cp_generic cpg = {
-+				.dentry	= dentry,
-+				.bdst	= a->bdst,
-+				.bsrc	= -1,
-+				.len	= -1,
-+				.pin	= &a->pin,
-+				.flags	= AuCpup_KEEPLINO
-+			};
-+			err = au_sio_cpup_simple(&cpg);
-+			au_h_open_post(dentry, a->bsrc, h_file);
-+			if (!err) {
-+				dput(a->h_path.dentry);
-+				a->h_path.dentry = au_h_dptr(dentry, a->bdst);
-+			} else
-+				au_set_h_dptr(dentry, a->bdst,
-+					      a->h_path.dentry);
-+		}
-+		spin_lock(&dentry->d_lock);
-+		dentry->d_inode = NULL; /* restore */
-+		spin_unlock(&dentry->d_lock);
-+		AuDbg("temporary d_inode...done\n");
-+		au_set_h_dptr(dentry, a->bsrc, NULL);
-+		au_set_dbend(dentry, bend);
-+	} else {
-+		/* the inode of src_dentry already exists on a.bdst branch */
-+		h_src_dentry = d_find_alias(h_inode);
-+		if (!h_src_dentry && au_plink_test(inode)) {
-+			plink = 1;
-+			h_src_dentry = au_plink_lkup(inode, a->bdst);
-+			err = PTR_ERR(h_src_dentry);
-+			if (IS_ERR(h_src_dentry))
-+				goto out;
-+
-+			if (unlikely(d_is_negative(h_src_dentry))) {
-+				dput(h_src_dentry);
-+				h_src_dentry = NULL;
-+			}
-+
-+		}
-+		if (h_src_dentry) {
-+			delegated = NULL;
-+			err = vfsub_link(h_src_dentry, au_pinned_h_dir(&a->pin),
-+					 &a->h_path, &delegated);
-+			if (unlikely(err == -EWOULDBLOCK)) {
-+				pr_warn("cannot retry for NFSv4 delegation"
-+					" for an internal link\n");
-+				iput(delegated);
-+			}
-+			dput(h_src_dentry);
-+		} else {
-+			AuIOErr("no dentry found for hi%lu on b%d\n",
-+				h_inode->i_ino, a->bdst);
-+			err = -EIO;
-+		}
-+	}
-+
-+	if (!err && !plink)
-+		au_plink_append(inode, a->bdst, a->h_path.dentry);
-+
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+int aufs_link(struct dentry *src_dentry, struct inode *dir,
-+	      struct dentry *dentry)
-+{
-+	int err, rerr;
-+	struct au_dtime dt;
-+	struct au_link_args *a;
-+	struct dentry *wh_dentry, *h_src_dentry;
-+	struct inode *inode, *delegated;
-+	struct super_block *sb;
-+	struct au_wr_dir_args wr_dir_args = {
-+		/* .force_btgt	= -1, */
-+		.flags		= AuWrDir_ADD_ENTRY
-+	};
-+
-+	IMustLock(dir);
-+	inode = d_inode(src_dentry);
-+	IMustLock(inode);
-+
-+	err = -ENOMEM;
-+	a = kzalloc(sizeof(*a), GFP_NOFS);
-+	if (unlikely(!a))
-+		goto out;
-+
-+	a->parent = dentry->d_parent; /* dir inode is locked */
-+	err = aufs_read_and_write_lock2(dentry, src_dentry,
-+					AuLock_NOPLM | AuLock_GEN);
-+	if (unlikely(err))
-+		goto out_kfree;
-+	err = au_d_linkable(src_dentry);
-+	if (unlikely(err))
-+		goto out_unlock;
-+	err = au_d_may_add(dentry);
-+	if (unlikely(err))
-+		goto out_unlock;
-+
-+	a->src_parent = dget_parent(src_dentry);
-+	wr_dir_args.force_btgt = au_ibstart(inode);
-+
-+	di_write_lock_parent(a->parent);
-+	wr_dir_args.force_btgt = au_wbr(dentry, wr_dir_args.force_btgt);
-+	wh_dentry = lock_hdir_lkup_wh(dentry, &dt, src_dentry, &a->pin,
-+				      &wr_dir_args);
-+	err = PTR_ERR(wh_dentry);
-+	if (IS_ERR(wh_dentry))
-+		goto out_parent;
-+
-+	err = 0;
-+	sb = dentry->d_sb;
-+	a->bdst = au_dbstart(dentry);
-+	a->h_path.dentry = au_h_dptr(dentry, a->bdst);
-+	a->h_path.mnt = au_sbr_mnt(sb, a->bdst);
-+	a->bsrc = au_ibstart(inode);
-+	h_src_dentry = au_h_d_alias(src_dentry, a->bsrc);
-+	if (!h_src_dentry && au_di(src_dentry)->di_tmpfile)
-+		h_src_dentry = dget(au_hi_wh(inode, a->bsrc));
-+	if (!h_src_dentry) {
-+		a->bsrc = au_dbstart(src_dentry);
-+		h_src_dentry = au_h_d_alias(src_dentry, a->bsrc);
-+		AuDebugOn(!h_src_dentry);
-+	} else if (IS_ERR(h_src_dentry)) {
-+		err = PTR_ERR(h_src_dentry);
-+		goto out_parent;
-+	}
-+
-+	if (au_opt_test(au_mntflags(sb), PLINK)) {
-+		if (a->bdst < a->bsrc
-+		    /* && h_src_dentry->d_sb != a->h_path.dentry->d_sb */)
-+			err = au_cpup_or_link(src_dentry, dentry, a);
-+		else {
-+			delegated = NULL;
-+			err = vfsub_link(h_src_dentry, au_pinned_h_dir(&a->pin),
-+					 &a->h_path, &delegated);
-+			if (unlikely(err == -EWOULDBLOCK)) {
-+				pr_warn("cannot retry for NFSv4 delegation"
-+					" for an internal link\n");
-+				iput(delegated);
-+			}
-+		}
-+		dput(h_src_dentry);
-+	} else {
-+		/*
-+		 * copyup src_dentry to the branch we process,
-+		 * and then link(2) to it.
-+		 */
-+		dput(h_src_dentry);
-+		if (a->bdst < a->bsrc
-+		    /* && h_src_dentry->d_sb != a->h_path.dentry->d_sb */) {
-+			au_unpin(&a->pin);
-+			di_write_unlock(a->parent);
-+			err = au_cpup_before_link(src_dentry, a);
-+			di_write_lock_parent(a->parent);
-+			if (!err)
-+				err = au_pin(&a->pin, dentry, a->bdst,
-+					     au_opt_udba(sb),
-+					     AuPin_DI_LOCKED | AuPin_MNT_WRITE);
-+			if (unlikely(err))
-+				goto out_wh;
-+		}
-+		if (!err) {
-+			h_src_dentry = au_h_dptr(src_dentry, a->bdst);
-+			err = -ENOENT;
-+			if (h_src_dentry && d_is_positive(h_src_dentry)) {
-+				delegated = NULL;
-+				err = vfsub_link(h_src_dentry,
-+						 au_pinned_h_dir(&a->pin),
-+						 &a->h_path, &delegated);
-+				if (unlikely(err == -EWOULDBLOCK)) {
-+					pr_warn("cannot retry"
-+						" for NFSv4 delegation"
-+						" for an internal link\n");
-+					iput(delegated);
-+				}
-+			}
-+		}
-+	}
-+	if (unlikely(err))
-+		goto out_unpin;
-+
-+	if (wh_dentry) {
-+		a->h_path.dentry = wh_dentry;
-+		err = au_wh_unlink_dentry(au_pinned_h_dir(&a->pin), &a->h_path,
-+					  dentry);
-+		if (unlikely(err))
-+			goto out_revert;
-+	}
-+
-+	au_dir_ts(dir, a->bdst);
-+	dir->i_version++;
-+	inc_nlink(inode);
-+	inode->i_ctime = dir->i_ctime;
-+	d_instantiate(dentry, au_igrab(inode));
-+	if (d_unhashed(a->h_path.dentry))
-+		/* some filesystem calls d_drop() */
-+		d_drop(dentry);
-+	/* some filesystems consume an inode even hardlink */
-+	au_fhsm_wrote(sb, a->bdst, /*force*/0);
-+	goto out_unpin; /* success */
-+
-+out_revert:
-+	/* no delegation since it is just created */
-+	rerr = vfsub_unlink(au_pinned_h_dir(&a->pin), &a->h_path,
-+			    /*delegated*/NULL, /*force*/0);
-+	if (unlikely(rerr)) {
-+		AuIOErr("%pd reverting failed(%d, %d)\n", dentry, err, rerr);
-+		err = -EIO;
-+	}
-+	au_dtime_revert(&dt);
-+out_unpin:
-+	au_unpin(&a->pin);
-+out_wh:
-+	dput(wh_dentry);
-+out_parent:
-+	di_write_unlock(a->parent);
-+	dput(a->src_parent);
-+out_unlock:
-+	if (unlikely(err)) {
-+		au_update_dbstart(dentry);
-+		d_drop(dentry);
-+	}
-+	aufs_read_and_write_unlock2(dentry, src_dentry);
-+out_kfree:
-+	kfree(a);
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+int aufs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
-+{
-+	int err, rerr;
-+	aufs_bindex_t bindex;
-+	unsigned char diropq;
-+	struct path h_path;
-+	struct dentry *wh_dentry, *parent, *opq_dentry;
-+	struct mutex *h_mtx;
-+	struct super_block *sb;
-+	struct {
-+		struct au_pin pin;
-+		struct au_dtime dt;
-+	} *a; /* reduce the stack usage */
-+	struct au_wr_dir_args wr_dir_args = {
-+		.force_btgt	= -1,
-+		.flags		= AuWrDir_ADD_ENTRY | AuWrDir_ISDIR
-+	};
-+
-+	IMustLock(dir);
-+
-+	err = -ENOMEM;
-+	a = kmalloc(sizeof(*a), GFP_NOFS);
-+	if (unlikely(!a))
-+		goto out;
-+
-+	err = aufs_read_lock(dentry, AuLock_DW | AuLock_GEN);
-+	if (unlikely(err))
-+		goto out_free;
-+	err = au_d_may_add(dentry);
-+	if (unlikely(err))
-+		goto out_unlock;
-+
-+	parent = dentry->d_parent; /* dir inode is locked */
-+	di_write_lock_parent(parent);
-+	wh_dentry = lock_hdir_lkup_wh(dentry, &a->dt, /*src_dentry*/NULL,
-+				      &a->pin, &wr_dir_args);
-+	err = PTR_ERR(wh_dentry);
-+	if (IS_ERR(wh_dentry))
-+		goto out_parent;
-+
-+	sb = dentry->d_sb;
-+	bindex = au_dbstart(dentry);
-+	h_path.dentry = au_h_dptr(dentry, bindex);
-+	h_path.mnt = au_sbr_mnt(sb, bindex);
-+	err = vfsub_mkdir(au_pinned_h_dir(&a->pin), &h_path, mode);
-+	if (unlikely(err))
-+		goto out_unpin;
-+
-+	/* make the dir opaque */
-+	diropq = 0;
-+	h_mtx = &d_inode(h_path.dentry)->i_mutex;
-+	if (wh_dentry
-+	    || au_opt_test(au_mntflags(sb), ALWAYS_DIROPQ)) {
-+		mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
-+		opq_dentry = au_diropq_create(dentry, bindex);
-+		mutex_unlock(h_mtx);
-+		err = PTR_ERR(opq_dentry);
-+		if (IS_ERR(opq_dentry))
-+			goto out_dir;
-+		dput(opq_dentry);
-+		diropq = 1;
-+	}
-+
-+	err = epilog(dir, bindex, wh_dentry, dentry);
-+	if (!err) {
-+		inc_nlink(dir);
-+		goto out_unpin; /* success */
-+	}
-+
-+	/* revert */
-+	if (diropq) {
-+		AuLabel(revert opq);
-+		mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
-+		rerr = au_diropq_remove(dentry, bindex);
-+		mutex_unlock(h_mtx);
-+		if (rerr) {
-+			AuIOErr("%pd reverting diropq failed(%d, %d)\n",
-+				dentry, err, rerr);
-+			err = -EIO;
-+		}
-+	}
-+
-+out_dir:
-+	AuLabel(revert dir);
-+	rerr = vfsub_rmdir(au_pinned_h_dir(&a->pin), &h_path);
-+	if (rerr) {
-+		AuIOErr("%pd reverting dir failed(%d, %d)\n",
-+			dentry, err, rerr);
-+		err = -EIO;
-+	}
-+	au_dtime_revert(&a->dt);
-+out_unpin:
-+	au_unpin(&a->pin);
-+	dput(wh_dentry);
-+out_parent:
-+	di_write_unlock(parent);
-+out_unlock:
-+	if (unlikely(err)) {
-+		au_update_dbstart(dentry);
-+		d_drop(dentry);
-+	}
-+	aufs_read_unlock(dentry, AuLock_DW);
-+out_free:
-+	kfree(a);
-+out:
-+	return err;
-+}
-diff -Nur linux-4.1.10.orig/fs/aufs/i_op.c linux-4.1.10/fs/aufs/i_op.c
---- linux-4.1.10.orig/fs/aufs/i_op.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/i_op.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,1447 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * inode operations (except add/del/rename)
-+ */
-+
-+#include <linux/device_cgroup.h>
-+#include <linux/fs_stack.h>
-+#include <linux/mm.h>
-+#include <linux/namei.h>
-+#include <linux/security.h>
-+#include "aufs.h"
-+
-+static int h_permission(struct inode *h_inode, int mask,
-+			struct vfsmount *h_mnt, int brperm)
-+{
-+	int err;
-+	const unsigned char write_mask = !!(mask & (MAY_WRITE | MAY_APPEND));
-+
-+	err = -EACCES;
-+	if ((write_mask && IS_IMMUTABLE(h_inode))
-+	    || ((mask & MAY_EXEC)
-+		&& S_ISREG(h_inode->i_mode)
-+		&& ((h_mnt->mnt_flags & MNT_NOEXEC)
-+		    || !(h_inode->i_mode & S_IXUGO))))
-+		goto out;
-+
-+	/*
-+	 * - skip the lower fs test in the case of write to ro branch.
-+	 * - nfs dir permission write check is optimized, but a policy for
-+	 *   link/rename requires a real check.
-+	 * - nfs always sets MS_POSIXACL regardless its mount option 'noacl.'
-+	 *   in this case, generic_permission() returns -EOPNOTSUPP.
-+	 */
-+	if ((write_mask && !au_br_writable(brperm))
-+	    || (au_test_nfs(h_inode->i_sb) && S_ISDIR(h_inode->i_mode)
-+		&& write_mask && !(mask & MAY_READ))
-+	    || !h_inode->i_op->permission) {
-+		/* AuLabel(generic_permission); */
-+		/* AuDbg("get_acl %pf\n", h_inode->i_op->get_acl); */
-+		err = generic_permission(h_inode, mask);
-+		if (err == -EOPNOTSUPP && au_test_nfs_noacl(h_inode))
-+			err = h_inode->i_op->permission(h_inode, mask);
-+		AuTraceErr(err);
-+	} else {
-+		/* AuLabel(h_inode->permission); */
-+		err = h_inode->i_op->permission(h_inode, mask);
-+		AuTraceErr(err);
-+	}
-+
-+	if (!err)
-+		err = devcgroup_inode_permission(h_inode, mask);
-+	if (!err)
-+		err = security_inode_permission(h_inode, mask);
-+
-+#if 0
-+	if (!err) {
-+		/* todo: do we need to call ima_path_check()? */
-+		struct path h_path = {
-+			.dentry	=
-+			.mnt	= h_mnt
-+		};
-+		err = ima_path_check(&h_path,
-+				     mask & (MAY_READ | MAY_WRITE | MAY_EXEC),
-+				     IMA_COUNT_LEAVE);
-+	}
-+#endif
-+
-+out:
-+	return err;
-+}
-+
-+static int aufs_permission(struct inode *inode, int mask)
-+{
-+	int err;
-+	aufs_bindex_t bindex, bend;
-+	const unsigned char isdir = !!S_ISDIR(inode->i_mode),
-+		write_mask = !!(mask & (MAY_WRITE | MAY_APPEND));
-+	struct inode *h_inode;
-+	struct super_block *sb;
-+	struct au_branch *br;
-+
-+	/* todo: support rcu-walk? */
-+	if (mask & MAY_NOT_BLOCK)
-+		return -ECHILD;
-+
-+	sb = inode->i_sb;
-+	si_read_lock(sb, AuLock_FLUSH);
-+	ii_read_lock_child(inode);
-+#if 0
-+	err = au_iigen_test(inode, au_sigen(sb));
-+	if (unlikely(err))
-+		goto out;
-+#endif
-+
-+	if (!isdir
-+	    || write_mask
-+	    || au_opt_test(au_mntflags(sb), DIRPERM1)) {
-+		err = au_busy_or_stale();
-+		h_inode = au_h_iptr(inode, au_ibstart(inode));
-+		if (unlikely(!h_inode
-+			     || (h_inode->i_mode & S_IFMT)
-+			     != (inode->i_mode & S_IFMT)))
-+			goto out;
-+
-+		err = 0;
-+		bindex = au_ibstart(inode);
-+		br = au_sbr(sb, bindex);
-+		err = h_permission(h_inode, mask, au_br_mnt(br), br->br_perm);
-+		if (write_mask
-+		    && !err
-+		    && !special_file(h_inode->i_mode)) {
-+			/* test whether the upper writable branch exists */
-+			err = -EROFS;
-+			for (; bindex >= 0; bindex--)
-+				if (!au_br_rdonly(au_sbr(sb, bindex))) {
-+					err = 0;
-+					break;
-+				}
-+		}
-+		goto out;
-+	}
-+
-+	/* non-write to dir */
-+	err = 0;
-+	bend = au_ibend(inode);
-+	for (bindex = au_ibstart(inode); !err && bindex <= bend; bindex++) {
-+		h_inode = au_h_iptr(inode, bindex);
-+		if (h_inode) {
-+			err = au_busy_or_stale();
-+			if (unlikely(!S_ISDIR(h_inode->i_mode)))
-+				break;
-+
-+			br = au_sbr(sb, bindex);
-+			err = h_permission(h_inode, mask, au_br_mnt(br),
-+					   br->br_perm);
-+		}
-+	}
-+
-+out:
-+	ii_read_unlock(inode);
-+	si_read_unlock(sb);
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static struct dentry *aufs_lookup(struct inode *dir, struct dentry *dentry,
-+				  unsigned int flags)
-+{
-+	struct dentry *ret, *parent;
-+	struct inode *inode;
-+	struct super_block *sb;
-+	int err, npositive;
-+
-+	IMustLock(dir);
-+
-+	/* todo: support rcu-walk? */
-+	ret = ERR_PTR(-ECHILD);
-+	if (flags & LOOKUP_RCU)
-+		goto out;
-+
-+	ret = ERR_PTR(-ENAMETOOLONG);
-+	if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN))
-+		goto out;
-+
-+	sb = dir->i_sb;
-+	err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM);
-+	ret = ERR_PTR(err);
-+	if (unlikely(err))
-+		goto out;
-+
-+	err = au_di_init(dentry);
-+	ret = ERR_PTR(err);
-+	if (unlikely(err))
-+		goto out_si;
-+
-+	inode = NULL;
-+	npositive = 0; /* suppress a warning */
-+	parent = dentry->d_parent; /* dir inode is locked */
-+	di_read_lock_parent(parent, AuLock_IR);
-+	err = au_alive_dir(parent);
-+	if (!err)
-+		err = au_digen_test(parent, au_sigen(sb));
-+	if (!err) {
-+		npositive = au_lkup_dentry(dentry, au_dbstart(parent),
-+					   /*type*/0);
-+		err = npositive;
-+	}
-+	di_read_unlock(parent, AuLock_IR);
-+	ret = ERR_PTR(err);
-+	if (unlikely(err < 0))
-+		goto out_unlock;
-+
-+	if (npositive) {
-+		inode = au_new_inode(dentry, /*must_new*/0);
-+		if (IS_ERR(inode)) {
-+			ret = (void *)inode;
-+			inode = NULL;
-+			goto out_unlock;
-+		}
-+	}
-+
-+	if (inode)
-+		atomic_inc(&inode->i_count);
-+	ret = d_splice_alias(inode, dentry);
-+#if 0
-+	if (unlikely(d_need_lookup(dentry))) {
-+		spin_lock(&dentry->d_lock);
-+		dentry->d_flags &= ~DCACHE_NEED_LOOKUP;
-+		spin_unlock(&dentry->d_lock);
-+	} else
-+#endif
-+	if (inode) {
-+		if (!IS_ERR(ret)) {
-+			iput(inode);
-+			if (ret && ret != dentry)
-+				ii_write_unlock(inode);
-+		} else {
-+			ii_write_unlock(inode);
-+			iput(inode);
-+			inode = NULL;
-+		}
-+	}
-+
-+out_unlock:
-+	di_write_unlock(dentry);
-+	if (inode) {
-+		/* verbose coding for lock class name */
-+		if (unlikely(S_ISLNK(inode->i_mode)))
-+			au_rw_class(&au_di(dentry)->di_rwsem,
-+				    au_lc_key + AuLcSymlink_DIINFO);
-+		else if (unlikely(S_ISDIR(inode->i_mode)))
-+			au_rw_class(&au_di(dentry)->di_rwsem,
-+				    au_lc_key + AuLcDir_DIINFO);
-+		else /* likely */
-+			au_rw_class(&au_di(dentry)->di_rwsem,
-+				    au_lc_key + AuLcNonDir_DIINFO);
-+	}
-+out_si:
-+	si_read_unlock(sb);
-+out:
-+	return ret;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+struct aopen_node {
-+	struct hlist_node hlist;
-+	struct file *file, *h_file;
-+};
-+
-+static int au_do_aopen(struct inode *inode, struct file *file)
-+{
-+	struct au_sphlhead *aopen;
-+	struct aopen_node *node;
-+	struct au_do_open_args args = {
-+		.no_lock	= 1,
-+		.open		= au_do_open_nondir
-+	};
-+
-+	aopen = &au_sbi(inode->i_sb)->si_aopen;
-+	spin_lock(&aopen->spin);
-+	hlist_for_each_entry(node, &aopen->head, hlist)
-+		if (node->file == file) {
-+			args.h_file = node->h_file;
-+			break;
-+		}
-+	spin_unlock(&aopen->spin);
-+	/* AuDebugOn(!args.h_file); */
-+
-+	return au_do_open(file, &args);
-+}
-+
-+static int aufs_atomic_open(struct inode *dir, struct dentry *dentry,
-+			    struct file *file, unsigned int open_flag,
-+			    umode_t create_mode, int *opened)
-+{
-+	int err, h_opened = *opened;
-+	struct dentry *parent;
-+	struct dentry *d;
-+	struct au_sphlhead *aopen;
-+	struct vfsub_aopen_args args = {
-+		.open_flag	= open_flag,
-+		.create_mode	= create_mode,
-+		.opened		= &h_opened
-+	};
-+	struct aopen_node aopen_node = {
-+		.file	= file
-+	};
-+
-+	IMustLock(dir);
-+	AuDbg("open_flag 0x%x\n", open_flag);
-+	AuDbgDentry(dentry);
-+
-+	err = 0;
-+	if (!au_di(dentry)) {
-+		d = aufs_lookup(dir, dentry, /*flags*/0);
-+		if (IS_ERR(d)) {
-+			err = PTR_ERR(d);
-+			goto out;
-+		} else if (d) {
-+			/*
-+			 * obsoleted dentry found.
-+			 * another error will be returned later.
-+			 */
-+			d_drop(d);
-+			dput(d);
-+			AuDbgDentry(d);
-+		}
-+		AuDbgDentry(dentry);
-+	}
-+
-+	if (d_is_positive(dentry)
-+	    || d_unhashed(dentry)
-+	    || d_unlinked(dentry)
-+	    || !(open_flag & O_CREAT))
-+		goto out_no_open;
-+
-+	err = aufs_read_lock(dentry, AuLock_DW | AuLock_FLUSH | AuLock_GEN);
-+	if (unlikely(err))
-+		goto out;
-+
-+	parent = dentry->d_parent;	/* dir is locked */
-+	di_write_lock_parent(parent);
-+	err = au_lkup_dentry(dentry, /*bstart*/0, /*type*/0);
-+	if (unlikely(err))
-+		goto out_unlock;
-+
-+	AuDbgDentry(dentry);
-+	if (d_is_positive(dentry))
-+		goto out_unlock;
-+
-+	args.file = get_empty_filp();
-+	err = PTR_ERR(args.file);
-+	if (IS_ERR(args.file))
-+		goto out_unlock;
-+
-+	args.file->f_flags = file->f_flags;
-+	err = au_aopen_or_create(dir, dentry, &args);
-+	AuTraceErr(err);
-+	AuDbgFile(args.file);
-+	if (unlikely(err < 0)) {
-+		if (h_opened & FILE_OPENED)
-+			fput(args.file);
-+		else
-+			put_filp(args.file);
-+		goto out_unlock;
-+	}
-+
-+	/* some filesystems don't set FILE_CREATED while succeeded? */
-+	*opened |= FILE_CREATED;
-+	if (h_opened & FILE_OPENED)
-+		aopen_node.h_file = args.file;
-+	else {
-+		put_filp(args.file);
-+		args.file = NULL;
-+	}
-+	aopen = &au_sbi(dir->i_sb)->si_aopen;
-+	au_sphl_add(&aopen_node.hlist, aopen);
-+	err = finish_open(file, dentry, au_do_aopen, opened);
-+	au_sphl_del(&aopen_node.hlist, aopen);
-+	AuTraceErr(err);
-+	AuDbgFile(file);
-+	if (aopen_node.h_file)
-+		fput(aopen_node.h_file);
-+
-+out_unlock:
-+	di_write_unlock(parent);
-+	aufs_read_unlock(dentry, AuLock_DW);
-+	AuDbgDentry(dentry);
-+	if (unlikely(err))
-+		goto out;
-+out_no_open:
-+	if (!err && !(*opened & FILE_CREATED)) {
-+		AuLabel(out_no_open);
-+		dget(dentry);
-+		err = finish_no_open(file, dentry);
-+	}
-+out:
-+	AuDbg("%pd%s%s\n", dentry,
-+	      (*opened & FILE_CREATED) ? " created" : "",
-+	      (*opened & FILE_OPENED) ? " opened" : "");
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static int au_wr_dir_cpup(struct dentry *dentry, struct dentry *parent,
-+			  const unsigned char add_entry, aufs_bindex_t bcpup,
-+			  aufs_bindex_t bstart)
-+{
-+	int err;
-+	struct dentry *h_parent;
-+	struct inode *h_dir;
-+
-+	if (add_entry)
-+		IMustLock(d_inode(parent));
-+	else
-+		di_write_lock_parent(parent);
-+
-+	err = 0;
-+	if (!au_h_dptr(parent, bcpup)) {
-+		if (bstart > bcpup)
-+			err = au_cpup_dirs(dentry, bcpup);
-+		else if (bstart < bcpup)
-+			err = au_cpdown_dirs(dentry, bcpup);
-+		else
-+			BUG();
-+	}
-+	if (!err && add_entry && !au_ftest_wrdir(add_entry, TMPFILE)) {
-+		h_parent = au_h_dptr(parent, bcpup);
-+		h_dir = d_inode(h_parent);
-+		mutex_lock_nested(&h_dir->i_mutex, AuLsc_I_PARENT);
-+		err = au_lkup_neg(dentry, bcpup, /*wh*/0);
-+		/* todo: no unlock here */
-+		mutex_unlock(&h_dir->i_mutex);
-+
-+		AuDbg("bcpup %d\n", bcpup);
-+		if (!err) {
-+			if (d_really_is_negative(dentry))
-+				au_set_h_dptr(dentry, bstart, NULL);
-+			au_update_dbrange(dentry, /*do_put_zero*/0);
-+		}
-+	}
-+
-+	if (!add_entry)
-+		di_write_unlock(parent);
-+	if (!err)
-+		err = bcpup; /* success */
-+
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+/*
-+ * decide the branch and the parent dir where we will create a new entry.
-+ * returns new bindex or an error.
-+ * copyup the parent dir if needed.
-+ */
-+int au_wr_dir(struct dentry *dentry, struct dentry *src_dentry,
-+	      struct au_wr_dir_args *args)
-+{
-+	int err;
-+	unsigned int flags;
-+	aufs_bindex_t bcpup, bstart, src_bstart;
-+	const unsigned char add_entry
-+		= au_ftest_wrdir(args->flags, ADD_ENTRY)
-+		| au_ftest_wrdir(args->flags, TMPFILE);
-+	struct super_block *sb;
-+	struct dentry *parent;
-+	struct au_sbinfo *sbinfo;
-+
-+	sb = dentry->d_sb;
-+	sbinfo = au_sbi(sb);
-+	parent = dget_parent(dentry);
-+	bstart = au_dbstart(dentry);
-+	bcpup = bstart;
-+	if (args->force_btgt < 0) {
-+		if (src_dentry) {
-+			src_bstart = au_dbstart(src_dentry);
-+			if (src_bstart < bstart)
-+				bcpup = src_bstart;
-+		} else if (add_entry) {
-+			flags = 0;
-+			if (au_ftest_wrdir(args->flags, ISDIR))
-+				au_fset_wbr(flags, DIR);
-+			err = AuWbrCreate(sbinfo, dentry, flags);
-+			bcpup = err;
-+		}
-+
-+		if (bcpup < 0 || au_test_ro(sb, bcpup, d_inode(dentry))) {
-+			if (add_entry)
-+				err = AuWbrCopyup(sbinfo, dentry);
-+			else {
-+				if (!IS_ROOT(dentry)) {
-+					di_read_lock_parent(parent, !AuLock_IR);
-+					err = AuWbrCopyup(sbinfo, dentry);
-+					di_read_unlock(parent, !AuLock_IR);
-+				} else
-+					err = AuWbrCopyup(sbinfo, dentry);
-+			}
-+			bcpup = err;
-+			if (unlikely(err < 0))
-+				goto out;
-+		}
-+	} else {
-+		bcpup = args->force_btgt;
-+		AuDebugOn(au_test_ro(sb, bcpup, d_inode(dentry)));
-+	}
-+
-+	AuDbg("bstart %d, bcpup %d\n", bstart, bcpup);
-+	err = bcpup;
-+	if (bcpup == bstart)
-+		goto out; /* success */
-+
-+	/* copyup the new parent into the branch we process */
-+	err = au_wr_dir_cpup(dentry, parent, add_entry, bcpup, bstart);
-+	if (err >= 0) {
-+		if (d_really_is_negative(dentry)) {
-+			au_set_h_dptr(dentry, bstart, NULL);
-+			au_set_dbstart(dentry, bcpup);
-+			au_set_dbend(dentry, bcpup);
-+		}
-+		AuDebugOn(add_entry
-+			  && !au_ftest_wrdir(args->flags, TMPFILE)
-+			  && !au_h_dptr(dentry, bcpup));
-+	}
-+
-+out:
-+	dput(parent);
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+void au_pin_hdir_unlock(struct au_pin *p)
-+{
-+	if (p->hdir)
-+		au_hn_imtx_unlock(p->hdir);
-+}
-+
-+int au_pin_hdir_lock(struct au_pin *p)
-+{
-+	int err;
-+
-+	err = 0;
-+	if (!p->hdir)
-+		goto out;
-+
-+	/* even if an error happens later, keep this lock */
-+	au_hn_imtx_lock_nested(p->hdir, p->lsc_hi);
-+
-+	err = -EBUSY;
-+	if (unlikely(p->hdir->hi_inode != d_inode(p->h_parent)))
-+		goto out;
-+
-+	err = 0;
-+	if (p->h_dentry)
-+		err = au_h_verify(p->h_dentry, p->udba, p->hdir->hi_inode,
-+				  p->h_parent, p->br);
-+
-+out:
-+	return err;
-+}
-+
-+int au_pin_hdir_relock(struct au_pin *p)
-+{
-+	int err, i;
-+	struct inode *h_i;
-+	struct dentry *h_d[] = {
-+		p->h_dentry,
-+		p->h_parent
-+	};
-+
-+	err = au_pin_hdir_lock(p);
-+	if (unlikely(err))
-+		goto out;
-+
-+	for (i = 0; !err && i < sizeof(h_d)/sizeof(*h_d); i++) {
-+		if (!h_d[i])
-+			continue;
-+		if (d_is_positive(h_d[i])) {
-+			h_i = d_inode(h_d[i]);
-+			err = !h_i->i_nlink;
-+		}
-+	}
-+
-+out:
-+	return err;
-+}
-+
-+void au_pin_hdir_set_owner(struct au_pin *p, struct task_struct *task)
-+{
-+#if defined(CONFIG_DEBUG_MUTEXES) || defined(CONFIG_SMP)
-+	p->hdir->hi_inode->i_mutex.owner = task;
-+#endif
-+}
-+
-+void au_pin_hdir_acquire_nest(struct au_pin *p)
-+{
-+	if (p->hdir) {
-+		mutex_acquire_nest(&p->hdir->hi_inode->i_mutex.dep_map,
-+				   p->lsc_hi, 0, NULL, _RET_IP_);
-+		au_pin_hdir_set_owner(p, current);
-+	}
-+}
-+
-+void au_pin_hdir_release(struct au_pin *p)
-+{
-+	if (p->hdir) {
-+		au_pin_hdir_set_owner(p, p->task);
-+		mutex_release(&p->hdir->hi_inode->i_mutex.dep_map, 1, _RET_IP_);
-+	}
-+}
-+
-+struct dentry *au_pinned_h_parent(struct au_pin *pin)
-+{
-+	if (pin && pin->parent)
-+		return au_h_dptr(pin->parent, pin->bindex);
-+	return NULL;
-+}
-+
-+void au_unpin(struct au_pin *p)
-+{
-+	if (p->hdir)
-+		au_pin_hdir_unlock(p);
-+	if (p->h_mnt && au_ftest_pin(p->flags, MNT_WRITE))
-+		vfsub_mnt_drop_write(p->h_mnt);
-+	if (!p->hdir)
-+		return;
-+
-+	if (!au_ftest_pin(p->flags, DI_LOCKED))
-+		di_read_unlock(p->parent, AuLock_IR);
-+	iput(p->hdir->hi_inode);
-+	dput(p->parent);
-+	p->parent = NULL;
-+	p->hdir = NULL;
-+	p->h_mnt = NULL;
-+	/* do not clear p->task */
-+}
-+
-+int au_do_pin(struct au_pin *p)
-+{
-+	int err;
-+	struct super_block *sb;
-+	struct inode *h_dir;
-+
-+	err = 0;
-+	sb = p->dentry->d_sb;
-+	p->br = au_sbr(sb, p->bindex);
-+	if (IS_ROOT(p->dentry)) {
-+		if (au_ftest_pin(p->flags, MNT_WRITE)) {
-+			p->h_mnt = au_br_mnt(p->br);
-+			err = vfsub_mnt_want_write(p->h_mnt);
-+			if (unlikely(err)) {
-+				au_fclr_pin(p->flags, MNT_WRITE);
-+				goto out_err;
-+			}
-+		}
-+		goto out;
-+	}
-+
-+	p->h_dentry = NULL;
-+	if (p->bindex <= au_dbend(p->dentry))
-+		p->h_dentry = au_h_dptr(p->dentry, p->bindex);
-+
-+	p->parent = dget_parent(p->dentry);
-+	if (!au_ftest_pin(p->flags, DI_LOCKED))
-+		di_read_lock(p->parent, AuLock_IR, p->lsc_di);
-+
-+	h_dir = NULL;
-+	p->h_parent = au_h_dptr(p->parent, p->bindex);
-+	p->hdir = au_hi(d_inode(p->parent), p->bindex);
-+	if (p->hdir)
-+		h_dir = p->hdir->hi_inode;
-+
-+	/*
-+	 * udba case, or
-+	 * if DI_LOCKED is not set, then p->parent may be different
-+	 * and h_parent can be NULL.
-+	 */
-+	if (unlikely(!p->hdir || !h_dir || !p->h_parent)) {
-+		err = -EBUSY;
-+		if (!au_ftest_pin(p->flags, DI_LOCKED))
-+			di_read_unlock(p->parent, AuLock_IR);
-+		dput(p->parent);
-+		p->parent = NULL;
-+		goto out_err;
-+	}
-+
-+	if (au_ftest_pin(p->flags, MNT_WRITE)) {
-+		p->h_mnt = au_br_mnt(p->br);
-+		err = vfsub_mnt_want_write(p->h_mnt);
-+		if (unlikely(err)) {
-+			au_fclr_pin(p->flags, MNT_WRITE);
-+			if (!au_ftest_pin(p->flags, DI_LOCKED))
-+				di_read_unlock(p->parent, AuLock_IR);
-+			dput(p->parent);
-+			p->parent = NULL;
-+			goto out_err;
-+		}
-+	}
-+
-+	au_igrab(h_dir);
-+	err = au_pin_hdir_lock(p);
-+	if (!err)
-+		goto out; /* success */
-+
-+	au_unpin(p);
-+
-+out_err:
-+	pr_err("err %d\n", err);
-+	err = au_busy_or_stale();
-+out:
-+	return err;
-+}
-+
-+void au_pin_init(struct au_pin *p, struct dentry *dentry,
-+		 aufs_bindex_t bindex, int lsc_di, int lsc_hi,
-+		 unsigned int udba, unsigned char flags)
-+{
-+	p->dentry = dentry;
-+	p->udba = udba;
-+	p->lsc_di = lsc_di;
-+	p->lsc_hi = lsc_hi;
-+	p->flags = flags;
-+	p->bindex = bindex;
-+
-+	p->parent = NULL;
-+	p->hdir = NULL;
-+	p->h_mnt = NULL;
-+
-+	p->h_dentry = NULL;
-+	p->h_parent = NULL;
-+	p->br = NULL;
-+	p->task = current;
-+}
-+
-+int au_pin(struct au_pin *pin, struct dentry *dentry, aufs_bindex_t bindex,
-+	   unsigned int udba, unsigned char flags)
-+{
-+	au_pin_init(pin, dentry, bindex, AuLsc_DI_PARENT, AuLsc_I_PARENT2,
-+		    udba, flags);
-+	return au_do_pin(pin);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/*
-+ * ->setattr() and ->getattr() are called in various cases.
-+ * chmod, stat: dentry is revalidated.
-+ * fchmod, fstat: file and dentry are not revalidated, additionally they may be
-+ *		  unhashed.
-+ * for ->setattr(), ia->ia_file is passed from ftruncate only.
-+ */
-+/* todo: consolidate with do_refresh() and simple_reval_dpath() */
-+int au_reval_for_attr(struct dentry *dentry, unsigned int sigen)
-+{
-+	int err;
-+	struct dentry *parent;
-+
-+	err = 0;
-+	if (au_digen_test(dentry, sigen)) {
-+		parent = dget_parent(dentry);
-+		di_read_lock_parent(parent, AuLock_IR);
-+		err = au_refresh_dentry(dentry, parent);
-+		di_read_unlock(parent, AuLock_IR);
-+		dput(parent);
-+	}
-+
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+int au_pin_and_icpup(struct dentry *dentry, struct iattr *ia,
-+		     struct au_icpup_args *a)
-+{
-+	int err;
-+	loff_t sz;
-+	aufs_bindex_t bstart, ibstart;
-+	struct dentry *hi_wh, *parent;
-+	struct inode *inode;
-+	struct au_wr_dir_args wr_dir_args = {
-+		.force_btgt	= -1,
-+		.flags		= 0
-+	};
-+
-+	if (d_is_dir(dentry))
-+		au_fset_wrdir(wr_dir_args.flags, ISDIR);
-+	/* plink or hi_wh() case */
-+	bstart = au_dbstart(dentry);
-+	inode = d_inode(dentry);
-+	ibstart = au_ibstart(inode);
-+	if (bstart != ibstart && !au_test_ro(inode->i_sb, ibstart, inode))
-+		wr_dir_args.force_btgt = ibstart;
-+	err = au_wr_dir(dentry, /*src_dentry*/NULL, &wr_dir_args);
-+	if (unlikely(err < 0))
-+		goto out;
-+	a->btgt = err;
-+	if (err != bstart)
-+		au_fset_icpup(a->flags, DID_CPUP);
-+
-+	err = 0;
-+	a->pin_flags = AuPin_MNT_WRITE;
-+	parent = NULL;
-+	if (!IS_ROOT(dentry)) {
-+		au_fset_pin(a->pin_flags, DI_LOCKED);
-+		parent = dget_parent(dentry);
-+		di_write_lock_parent(parent);
-+	}
-+
-+	err = au_pin(&a->pin, dentry, a->btgt, a->udba, a->pin_flags);
-+	if (unlikely(err))
-+		goto out_parent;
-+
-+	a->h_path.dentry = au_h_dptr(dentry, bstart);
-+	sz = -1;
-+	a->h_inode = d_inode(a->h_path.dentry);
-+	if (ia && (ia->ia_valid & ATTR_SIZE)) {
-+		mutex_lock_nested(&a->h_inode->i_mutex, AuLsc_I_CHILD);
-+		if (ia->ia_size < i_size_read(a->h_inode))
-+			sz = ia->ia_size;
-+		mutex_unlock(&a->h_inode->i_mutex);
-+	}
-+
-+	hi_wh = NULL;
-+	if (au_ftest_icpup(a->flags, DID_CPUP) && d_unlinked(dentry)) {
-+		hi_wh = au_hi_wh(inode, a->btgt);
-+		if (!hi_wh) {
-+			struct au_cp_generic cpg = {
-+				.dentry	= dentry,
-+				.bdst	= a->btgt,
-+				.bsrc	= -1,
-+				.len	= sz,
-+				.pin	= &a->pin
-+			};
-+			err = au_sio_cpup_wh(&cpg, /*file*/NULL);
-+			if (unlikely(err))
-+				goto out_unlock;
-+			hi_wh = au_hi_wh(inode, a->btgt);
-+			/* todo: revalidate hi_wh? */
-+		}
-+	}
-+
-+	if (parent) {
-+		au_pin_set_parent_lflag(&a->pin, /*lflag*/0);
-+		di_downgrade_lock(parent, AuLock_IR);
-+		dput(parent);
-+		parent = NULL;
-+	}
-+	if (!au_ftest_icpup(a->flags, DID_CPUP))
-+		goto out; /* success */
-+
-+	if (!d_unhashed(dentry)) {
-+		struct au_cp_generic cpg = {
-+			.dentry	= dentry,
-+			.bdst	= a->btgt,
-+			.bsrc	= bstart,
-+			.len	= sz,
-+			.pin	= &a->pin,
-+			.flags	= AuCpup_DTIME | AuCpup_HOPEN
-+		};
-+		err = au_sio_cpup_simple(&cpg);
-+		if (!err)
-+			a->h_path.dentry = au_h_dptr(dentry, a->btgt);
-+	} else if (!hi_wh)
-+		a->h_path.dentry = au_h_dptr(dentry, a->btgt);
-+	else
-+		a->h_path.dentry = hi_wh; /* do not dget here */
-+
-+out_unlock:
-+	a->h_inode = d_inode(a->h_path.dentry);
-+	if (!err)
-+		goto out; /* success */
-+	au_unpin(&a->pin);
-+out_parent:
-+	if (parent) {
-+		di_write_unlock(parent);
-+		dput(parent);
-+	}
-+out:
-+	if (!err)
-+		mutex_lock_nested(&a->h_inode->i_mutex, AuLsc_I_CHILD);
-+	return err;
-+}
-+
-+static int aufs_setattr(struct dentry *dentry, struct iattr *ia)
-+{
-+	int err;
-+	struct inode *inode, *delegated;
-+	struct super_block *sb;
-+	struct file *file;
-+	struct au_icpup_args *a;
-+
-+	inode = d_inode(dentry);
-+	IMustLock(inode);
-+
-+	err = -ENOMEM;
-+	a = kzalloc(sizeof(*a), GFP_NOFS);
-+	if (unlikely(!a))
-+		goto out;
-+
-+	if (ia->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
-+		ia->ia_valid &= ~ATTR_MODE;
-+
-+	file = NULL;
-+	sb = dentry->d_sb;
-+	err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM);
-+	if (unlikely(err))
-+		goto out_kfree;
-+
-+	if (ia->ia_valid & ATTR_FILE) {
-+		/* currently ftruncate(2) only */
-+		AuDebugOn(!d_is_reg(dentry));
-+		file = ia->ia_file;
-+		err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1);
-+		if (unlikely(err))
-+			goto out_si;
-+		ia->ia_file = au_hf_top(file);
-+		a->udba = AuOpt_UDBA_NONE;
-+	} else {
-+		/* fchmod() doesn't pass ia_file */
-+		a->udba = au_opt_udba(sb);
-+		di_write_lock_child(dentry);
-+		/* no d_unlinked(), to set UDBA_NONE for root */
-+		if (d_unhashed(dentry))
-+			a->udba = AuOpt_UDBA_NONE;
-+		if (a->udba != AuOpt_UDBA_NONE) {
-+			AuDebugOn(IS_ROOT(dentry));
-+			err = au_reval_for_attr(dentry, au_sigen(sb));
-+			if (unlikely(err))
-+				goto out_dentry;
-+		}
-+	}
-+
-+	err = au_pin_and_icpup(dentry, ia, a);
-+	if (unlikely(err < 0))
-+		goto out_dentry;
-+	if (au_ftest_icpup(a->flags, DID_CPUP)) {
-+		ia->ia_file = NULL;
-+		ia->ia_valid &= ~ATTR_FILE;
-+	}
-+
-+	a->h_path.mnt = au_sbr_mnt(sb, a->btgt);
-+	if ((ia->ia_valid & (ATTR_MODE | ATTR_CTIME))
-+	    == (ATTR_MODE | ATTR_CTIME)) {
-+		err = security_path_chmod(&a->h_path, ia->ia_mode);
-+		if (unlikely(err))
-+			goto out_unlock;
-+	} else if ((ia->ia_valid & (ATTR_UID | ATTR_GID))
-+		   && (ia->ia_valid & ATTR_CTIME)) {
-+		err = security_path_chown(&a->h_path, ia->ia_uid, ia->ia_gid);
-+		if (unlikely(err))
-+			goto out_unlock;
-+	}
-+
-+	if (ia->ia_valid & ATTR_SIZE) {
-+		struct file *f;
-+
-+		if (ia->ia_size < i_size_read(inode))
-+			/* unmap only */
-+			truncate_setsize(inode, ia->ia_size);
-+
-+		f = NULL;
-+		if (ia->ia_valid & ATTR_FILE)
-+			f = ia->ia_file;
-+		mutex_unlock(&a->h_inode->i_mutex);
-+		err = vfsub_trunc(&a->h_path, ia->ia_size, ia->ia_valid, f);
-+		mutex_lock_nested(&a->h_inode->i_mutex, AuLsc_I_CHILD);
-+	} else {
-+		delegated = NULL;
-+		while (1) {
-+			err = vfsub_notify_change(&a->h_path, ia, &delegated);
-+			if (delegated) {
-+				err = break_deleg_wait(&delegated);
-+				if (!err)
-+					continue;
-+			}
-+			break;
-+		}
-+	}
-+	if (!err)
-+		au_cpup_attr_changeable(inode);
-+
-+out_unlock:
-+	mutex_unlock(&a->h_inode->i_mutex);
-+	au_unpin(&a->pin);
-+	if (unlikely(err))
-+		au_update_dbstart(dentry);
-+out_dentry:
-+	di_write_unlock(dentry);
-+	if (file) {
-+		fi_write_unlock(file);
-+		ia->ia_file = file;
-+		ia->ia_valid |= ATTR_FILE;
-+	}
-+out_si:
-+	si_read_unlock(sb);
-+out_kfree:
-+	kfree(a);
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+#if IS_ENABLED(CONFIG_AUFS_XATTR) || IS_ENABLED(CONFIG_FS_POSIX_ACL)
-+static int au_h_path_to_set_attr(struct dentry *dentry,
-+				 struct au_icpup_args *a, struct path *h_path)
-+{
-+	int err;
-+	struct super_block *sb;
-+
-+	sb = dentry->d_sb;
-+	a->udba = au_opt_udba(sb);
-+	/* no d_unlinked(), to set UDBA_NONE for root */
-+	if (d_unhashed(dentry))
-+		a->udba = AuOpt_UDBA_NONE;
-+	if (a->udba != AuOpt_UDBA_NONE) {
-+		AuDebugOn(IS_ROOT(dentry));
-+		err = au_reval_for_attr(dentry, au_sigen(sb));
-+		if (unlikely(err))
-+			goto out;
-+	}
-+	err = au_pin_and_icpup(dentry, /*ia*/NULL, a);
-+	if (unlikely(err < 0))
-+		goto out;
-+
-+	h_path->dentry = a->h_path.dentry;
-+	h_path->mnt = au_sbr_mnt(sb, a->btgt);
-+
-+out:
-+	return err;
-+}
-+
-+ssize_t au_srxattr(struct dentry *dentry, struct au_srxattr *arg)
-+{
-+	int err;
-+	struct path h_path;
-+	struct super_block *sb;
-+	struct au_icpup_args *a;
-+	struct inode *inode, *h_inode;
-+
-+	inode = d_inode(dentry);
-+	IMustLock(inode);
-+
-+	err = -ENOMEM;
-+	a = kzalloc(sizeof(*a), GFP_NOFS);
-+	if (unlikely(!a))
-+		goto out;
-+
-+	sb = dentry->d_sb;
-+	err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM);
-+	if (unlikely(err))
-+		goto out_kfree;
-+
-+	h_path.dentry = NULL;	/* silence gcc */
-+	di_write_lock_child(dentry);
-+	err = au_h_path_to_set_attr(dentry, a, &h_path);
-+	if (unlikely(err))
-+		goto out_di;
-+
-+	mutex_unlock(&a->h_inode->i_mutex);
-+	switch (arg->type) {
-+	case AU_XATTR_SET:
-+		err = vfsub_setxattr(h_path.dentry,
-+				     arg->u.set.name, arg->u.set.value,
-+				     arg->u.set.size, arg->u.set.flags);
-+		break;
-+	case AU_XATTR_REMOVE:
-+		err = vfsub_removexattr(h_path.dentry, arg->u.remove.name);
-+		break;
-+	case AU_ACL_SET:
-+		err = -EOPNOTSUPP;
-+		h_inode = d_inode(h_path.dentry);
-+		if (h_inode->i_op->set_acl)
-+			err = h_inode->i_op->set_acl(h_inode,
-+						     arg->u.acl_set.acl,
-+						     arg->u.acl_set.type);
-+		break;
-+	}
-+	if (!err)
-+		au_cpup_attr_timesizes(inode);
-+
-+	au_unpin(&a->pin);
-+	if (unlikely(err))
-+		au_update_dbstart(dentry);
-+
-+out_di:
-+	di_write_unlock(dentry);
-+	si_read_unlock(sb);
-+out_kfree:
-+	kfree(a);
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-+#endif
-+
-+static void au_refresh_iattr(struct inode *inode, struct kstat *st,
-+			     unsigned int nlink)
-+{
-+	unsigned int n;
-+
-+	inode->i_mode = st->mode;
-+	/* don't i_[ug]id_write() here */
-+	inode->i_uid = st->uid;
-+	inode->i_gid = st->gid;
-+	inode->i_atime = st->atime;
-+	inode->i_mtime = st->mtime;
-+	inode->i_ctime = st->ctime;
-+
-+	au_cpup_attr_nlink(inode, /*force*/0);
-+	if (S_ISDIR(inode->i_mode)) {
-+		n = inode->i_nlink;
-+		n -= nlink;
-+		n += st->nlink;
-+		smp_mb(); /* for i_nlink */
-+		/* 0 can happen */
-+		set_nlink(inode, n);
-+	}
-+
-+	spin_lock(&inode->i_lock);
-+	inode->i_blocks = st->blocks;
-+	i_size_write(inode, st->size);
-+	spin_unlock(&inode->i_lock);
-+}
-+
-+/*
-+ * common routine for aufs_getattr() and aufs_getxattr().
-+ * returns zero or negative (an error).
-+ * @dentry will be read-locked in success.
-+ */
-+int au_h_path_getattr(struct dentry *dentry, int force, struct path *h_path)
-+{
-+	int err;
-+	unsigned int mnt_flags, sigen;
-+	unsigned char udba_none;
-+	aufs_bindex_t bindex;
-+	struct super_block *sb, *h_sb;
-+	struct inode *inode;
-+
-+	h_path->mnt = NULL;
-+	h_path->dentry = NULL;
-+
-+	err = 0;
-+	sb = dentry->d_sb;
-+	mnt_flags = au_mntflags(sb);
-+	udba_none = !!au_opt_test(mnt_flags, UDBA_NONE);
-+
-+	/* support fstat(2) */
-+	if (!d_unlinked(dentry) && !udba_none) {
-+		sigen = au_sigen(sb);
-+		err = au_digen_test(dentry, sigen);
-+		if (!err) {
-+			di_read_lock_child(dentry, AuLock_IR);
-+			err = au_dbrange_test(dentry);
-+			if (unlikely(err)) {
-+				di_read_unlock(dentry, AuLock_IR);
-+				goto out;
-+			}
-+		} else {
-+			AuDebugOn(IS_ROOT(dentry));
-+			di_write_lock_child(dentry);
-+			err = au_dbrange_test(dentry);
-+			if (!err)
-+				err = au_reval_for_attr(dentry, sigen);
-+			if (!err)
-+				di_downgrade_lock(dentry, AuLock_IR);
-+			else {
-+				di_write_unlock(dentry);
-+				goto out;
-+			}
-+		}
-+	} else
-+		di_read_lock_child(dentry, AuLock_IR);
-+
-+	inode = d_inode(dentry);
-+	bindex = au_ibstart(inode);
-+	h_path->mnt = au_sbr_mnt(sb, bindex);
-+	h_sb = h_path->mnt->mnt_sb;
-+	if (!force
-+	    && !au_test_fs_bad_iattr(h_sb)
-+	    && udba_none)
-+		goto out; /* success */
-+
-+	if (au_dbstart(dentry) == bindex)
-+		h_path->dentry = au_h_dptr(dentry, bindex);
-+	else if (au_opt_test(mnt_flags, PLINK) && au_plink_test(inode)) {
-+		h_path->dentry = au_plink_lkup(inode, bindex);
-+		if (IS_ERR(h_path->dentry))
-+			/* pretending success */
-+			h_path->dentry = NULL;
-+		else
-+			dput(h_path->dentry);
-+	}
-+
-+out:
-+	return err;
-+}
-+
-+static int aufs_getattr(struct vfsmount *mnt __maybe_unused,
-+			struct dentry *dentry, struct kstat *st)
-+{
-+	int err;
-+	unsigned char positive;
-+	struct path h_path;
-+	struct inode *inode;
-+	struct super_block *sb;
-+
-+	inode = d_inode(dentry);
-+	sb = dentry->d_sb;
-+	err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM);
-+	if (unlikely(err))
-+		goto out;
-+	err = au_h_path_getattr(dentry, /*force*/0, &h_path);
-+	if (unlikely(err))
-+		goto out_si;
-+	if (unlikely(!h_path.dentry))
-+		/* illegally overlapped or something */
-+		goto out_fill; /* pretending success */
-+
-+	positive = d_is_positive(h_path.dentry);
-+	if (positive)
-+		err = vfs_getattr(&h_path, st);
-+	if (!err) {
-+		if (positive)
-+			au_refresh_iattr(inode, st,
-+					 d_inode(h_path.dentry)->i_nlink);
-+		goto out_fill; /* success */
-+	}
-+	AuTraceErr(err);
-+	goto out_di;
-+
-+out_fill:
-+	generic_fillattr(inode, st);
-+out_di:
-+	di_read_unlock(dentry, AuLock_IR);
-+out_si:
-+	si_read_unlock(sb);
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static int h_readlink(struct dentry *dentry, int bindex, char __user *buf,
-+		      int bufsiz)
-+{
-+	int err;
-+	struct super_block *sb;
-+	struct dentry *h_dentry;
-+	struct inode *inode, *h_inode;
-+
-+	err = -EINVAL;
-+	h_dentry = au_h_dptr(dentry, bindex);
-+	h_inode = d_inode(h_dentry);
-+	if (unlikely(!h_inode->i_op->readlink))
-+		goto out;
-+
-+	err = security_inode_readlink(h_dentry);
-+	if (unlikely(err))
-+		goto out;
-+
-+	sb = dentry->d_sb;
-+	inode = d_inode(dentry);
-+	if (!au_test_ro(sb, bindex, inode)) {
-+		vfsub_touch_atime(au_sbr_mnt(sb, bindex), h_dentry);
-+		fsstack_copy_attr_atime(inode, h_inode);
-+	}
-+	err = h_inode->i_op->readlink(h_dentry, buf, bufsiz);
-+
-+out:
-+	return err;
-+}
-+
-+static int aufs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
-+{
-+	int err;
-+
-+	err = aufs_read_lock(dentry, AuLock_IR | AuLock_GEN);
-+	if (unlikely(err))
-+		goto out;
-+	err = au_d_hashed_positive(dentry);
-+	if (!err)
-+		err = h_readlink(dentry, au_dbstart(dentry), buf, bufsiz);
-+	aufs_read_unlock(dentry, AuLock_IR);
-+
-+out:
-+	return err;
-+}
-+
-+static void *aufs_follow_link(struct dentry *dentry, struct nameidata *nd)
-+{
-+	int err;
-+	mm_segment_t old_fs;
-+	union {
-+		char *k;
-+		char __user *u;
-+	} buf;
-+
-+	err = -ENOMEM;
-+	buf.k = (void *)__get_free_page(GFP_NOFS);
-+	if (unlikely(!buf.k))
-+		goto out;
-+
-+	err = aufs_read_lock(dentry, AuLock_IR | AuLock_GEN);
-+	if (unlikely(err))
-+		goto out_name;
-+
-+	err = au_d_hashed_positive(dentry);
-+	if (!err) {
-+		old_fs = get_fs();
-+		set_fs(KERNEL_DS);
-+		err = h_readlink(dentry, au_dbstart(dentry), buf.u, PATH_MAX);
-+		set_fs(old_fs);
-+	}
-+	aufs_read_unlock(dentry, AuLock_IR);
-+
-+	if (err >= 0) {
-+		buf.k[err] = 0;
-+		/* will be freed by put_link */
-+		nd_set_link(nd, buf.k);
-+		return NULL; /* success */
-+	}
-+
-+out_name:
-+	free_page((unsigned long)buf.k);
-+out:
-+	AuTraceErr(err);
-+	return ERR_PTR(err);
-+}
-+
-+static void aufs_put_link(struct dentry *dentry __maybe_unused,
-+			  struct nameidata *nd, void *cookie __maybe_unused)
-+{
-+	char *p;
-+
-+	p = nd_get_link(nd);
-+	if (!IS_ERR_OR_NULL(p))
-+		free_page((unsigned long)p);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static int aufs_update_time(struct inode *inode, struct timespec *ts, int flags)
-+{
-+	int err;
-+	struct super_block *sb;
-+	struct inode *h_inode;
-+
-+	sb = inode->i_sb;
-+	/* mmap_sem might be acquired already, cf. aufs_mmap() */
-+	lockdep_off();
-+	si_read_lock(sb, AuLock_FLUSH);
-+	ii_write_lock_child(inode);
-+	lockdep_on();
-+	h_inode = au_h_iptr(inode, au_ibstart(inode));
-+	err = vfsub_update_time(h_inode, ts, flags);
-+	lockdep_off();
-+	if (!err)
-+		au_cpup_attr_timesizes(inode);
-+	ii_write_unlock(inode);
-+	si_read_unlock(sb);
-+	lockdep_on();
-+
-+	if (!err && (flags & S_VERSION))
-+		inode_inc_iversion(inode);
-+
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+struct inode_operations aufs_symlink_iop = {
-+	.permission	= aufs_permission,
-+#ifdef CONFIG_FS_POSIX_ACL
-+	.get_acl	= aufs_get_acl,
-+	.set_acl	= aufs_set_acl, /* unsupport for symlink? */
-+#endif
-+
-+	.setattr	= aufs_setattr,
-+	.getattr	= aufs_getattr,
-+
-+#ifdef CONFIG_AUFS_XATTR
-+	.setxattr	= aufs_setxattr,
-+	.getxattr	= aufs_getxattr,
-+	.listxattr	= aufs_listxattr,
-+	.removexattr	= aufs_removexattr,
-+#endif
-+
-+	.readlink	= aufs_readlink,
-+	.follow_link	= aufs_follow_link,
-+	.put_link	= aufs_put_link,
-+
-+	/* .update_time	= aufs_update_time */
-+};
-+
-+struct inode_operations aufs_dir_iop = {
-+	.create		= aufs_create,
-+	.lookup		= aufs_lookup,
-+	.link		= aufs_link,
-+	.unlink		= aufs_unlink,
-+	.symlink	= aufs_symlink,
-+	.mkdir		= aufs_mkdir,
-+	.rmdir		= aufs_rmdir,
-+	.mknod		= aufs_mknod,
-+	.rename		= aufs_rename,
-+
-+	.permission	= aufs_permission,
-+#ifdef CONFIG_FS_POSIX_ACL
-+	.get_acl	= aufs_get_acl,
-+	.set_acl	= aufs_set_acl,
-+#endif
-+
-+	.setattr	= aufs_setattr,
-+	.getattr	= aufs_getattr,
-+
-+#ifdef CONFIG_AUFS_XATTR
-+	.setxattr	= aufs_setxattr,
-+	.getxattr	= aufs_getxattr,
-+	.listxattr	= aufs_listxattr,
-+	.removexattr	= aufs_removexattr,
-+#endif
-+
-+	.update_time	= aufs_update_time,
-+	.atomic_open	= aufs_atomic_open,
-+	.tmpfile	= aufs_tmpfile
-+};
-+
-+struct inode_operations aufs_iop = {
-+	.permission	= aufs_permission,
-+#ifdef CONFIG_FS_POSIX_ACL
-+	.get_acl	= aufs_get_acl,
-+	.set_acl	= aufs_set_acl,
-+#endif
-+
-+	.setattr	= aufs_setattr,
-+	.getattr	= aufs_getattr,
-+
-+#ifdef CONFIG_AUFS_XATTR
-+	.setxattr	= aufs_setxattr,
-+	.getxattr	= aufs_getxattr,
-+	.listxattr	= aufs_listxattr,
-+	.removexattr	= aufs_removexattr,
-+#endif
-+
-+	.update_time	= aufs_update_time
-+};
-diff -Nur linux-4.1.10.orig/fs/aufs/i_op_del.c linux-4.1.10/fs/aufs/i_op_del.c
---- linux-4.1.10.orig/fs/aufs/i_op_del.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/i_op_del.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,510 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * inode operations (del entry)
-+ */
-+
-+#include "aufs.h"
-+
-+/*
-+ * decide if a new whiteout for @dentry is necessary or not.
-+ * when it is necessary, prepare the parent dir for the upper branch whose
-+ * branch index is @bcpup for creation. the actual creation of the whiteout will
-+ * be done by caller.
-+ * return value:
-+ * 0: wh is unnecessary
-+ * plus: wh is necessary
-+ * minus: error
-+ */
-+int au_wr_dir_need_wh(struct dentry *dentry, int isdir, aufs_bindex_t *bcpup)
-+{
-+	int need_wh, err;
-+	aufs_bindex_t bstart;
-+	struct super_block *sb;
-+
-+	sb = dentry->d_sb;
-+	bstart = au_dbstart(dentry);
-+	if (*bcpup < 0) {
-+		*bcpup = bstart;
-+		if (au_test_ro(sb, bstart, d_inode(dentry))) {
-+			err = AuWbrCopyup(au_sbi(sb), dentry);
-+			*bcpup = err;
-+			if (unlikely(err < 0))
-+				goto out;
-+		}
-+	} else
-+		AuDebugOn(bstart < *bcpup
-+			  || au_test_ro(sb, *bcpup, d_inode(dentry)));
-+	AuDbg("bcpup %d, bstart %d\n", *bcpup, bstart);
-+
-+	if (*bcpup != bstart) {
-+		err = au_cpup_dirs(dentry, *bcpup);
-+		if (unlikely(err))
-+			goto out;
-+		need_wh = 1;
-+	} else {
-+		struct au_dinfo *dinfo, *tmp;
-+
-+		need_wh = -ENOMEM;
-+		dinfo = au_di(dentry);
-+		tmp = au_di_alloc(sb, AuLsc_DI_TMP);
-+		if (tmp) {
-+			au_di_cp(tmp, dinfo);
-+			au_di_swap(tmp, dinfo);
-+			/* returns the number of positive dentries */
-+			need_wh = au_lkup_dentry(dentry, bstart + 1, /*type*/0);
-+			au_di_swap(tmp, dinfo);
-+			au_rw_write_unlock(&tmp->di_rwsem);
-+			au_di_free(tmp);
-+		}
-+	}
-+	AuDbg("need_wh %d\n", need_wh);
-+	err = need_wh;
-+
-+out:
-+	return err;
-+}
-+
-+/*
-+ * simple tests for the del-entry operations.
-+ * following the checks in vfs, plus the parent-child relationship.
-+ */
-+int au_may_del(struct dentry *dentry, aufs_bindex_t bindex,
-+	       struct dentry *h_parent, int isdir)
-+{
-+	int err;
-+	umode_t h_mode;
-+	struct dentry *h_dentry, *h_latest;
-+	struct inode *h_inode;
-+
-+	h_dentry = au_h_dptr(dentry, bindex);
-+	if (d_really_is_positive(dentry)) {
-+		err = -ENOENT;
-+		if (unlikely(d_is_negative(h_dentry)))
-+			goto out;
-+		h_inode = d_inode(h_dentry);
-+		if (unlikely(!h_inode->i_nlink))
-+			goto out;
-+
-+		h_mode = h_inode->i_mode;
-+		if (!isdir) {
-+			err = -EISDIR;
-+			if (unlikely(S_ISDIR(h_mode)))
-+				goto out;
-+		} else if (unlikely(!S_ISDIR(h_mode))) {
-+			err = -ENOTDIR;
-+			goto out;
-+		}
-+	} else {
-+		/* rename(2) case */
-+		err = -EIO;
-+		if (unlikely(d_is_positive(h_dentry)))
-+			goto out;
-+	}
-+
-+	err = -ENOENT;
-+	/* expected parent dir is locked */
-+	if (unlikely(h_parent != h_dentry->d_parent))
-+		goto out;
-+	err = 0;
-+
-+	/*
-+	 * rmdir a dir may break the consistency on some filesystem.
-+	 * let's try heavy test.
-+	 */
-+	err = -EACCES;
-+	if (unlikely(!au_opt_test(au_mntflags(dentry->d_sb), DIRPERM1)
-+		     && au_test_h_perm(d_inode(h_parent),
-+				       MAY_EXEC | MAY_WRITE)))
-+		goto out;
-+
-+	h_latest = au_sio_lkup_one(&dentry->d_name, h_parent);
-+	err = -EIO;
-+	if (IS_ERR(h_latest))
-+		goto out;
-+	if (h_latest == h_dentry)
-+		err = 0;
-+	dput(h_latest);
-+
-+out:
-+	return err;
-+}
-+
-+/*
-+ * decide the branch where we operate for @dentry. the branch index will be set
-+ * @rbcpup. after diciding it, 'pin' it and store the timestamps of the parent
-+ * dir for reverting.
-+ * when a new whiteout is necessary, create it.
-+ */
-+static struct dentry*
-+lock_hdir_create_wh(struct dentry *dentry, int isdir, aufs_bindex_t *rbcpup,
-+		    struct au_dtime *dt, struct au_pin *pin)
-+{
-+	struct dentry *wh_dentry;
-+	struct super_block *sb;
-+	struct path h_path;
-+	int err, need_wh;
-+	unsigned int udba;
-+	aufs_bindex_t bcpup;
-+
-+	need_wh = au_wr_dir_need_wh(dentry, isdir, rbcpup);
-+	wh_dentry = ERR_PTR(need_wh);
-+	if (unlikely(need_wh < 0))
-+		goto out;
-+
-+	sb = dentry->d_sb;
-+	udba = au_opt_udba(sb);
-+	bcpup = *rbcpup;
-+	err = au_pin(pin, dentry, bcpup, udba,
-+		     AuPin_DI_LOCKED | AuPin_MNT_WRITE);
-+	wh_dentry = ERR_PTR(err);
-+	if (unlikely(err))
-+		goto out;
-+
-+	h_path.dentry = au_pinned_h_parent(pin);
-+	if (udba != AuOpt_UDBA_NONE
-+	    && au_dbstart(dentry) == bcpup) {
-+		err = au_may_del(dentry, bcpup, h_path.dentry, isdir);
-+		wh_dentry = ERR_PTR(err);
-+		if (unlikely(err))
-+			goto out_unpin;
-+	}
-+
-+	h_path.mnt = au_sbr_mnt(sb, bcpup);
-+	au_dtime_store(dt, au_pinned_parent(pin), &h_path);
-+	wh_dentry = NULL;
-+	if (!need_wh)
-+		goto out; /* success, no need to create whiteout */
-+
-+	wh_dentry = au_wh_create(dentry, bcpup, h_path.dentry);
-+	if (IS_ERR(wh_dentry))
-+		goto out_unpin;
-+
-+	/* returns with the parent is locked and wh_dentry is dget-ed */
-+	goto out; /* success */
-+
-+out_unpin:
-+	au_unpin(pin);
-+out:
-+	return wh_dentry;
-+}
-+
-+/*
-+ * when removing a dir, rename it to a unique temporary whiteout-ed name first
-+ * in order to be revertible and save time for removing many child whiteouts
-+ * under the dir.
-+ * returns 1 when there are too many child whiteout and caller should remove
-+ * them asynchronously. returns 0 when the number of children is enough small to
-+ * remove now or the branch fs is a remote fs.
-+ * otherwise return an error.
-+ */
-+static int renwh_and_rmdir(struct dentry *dentry, aufs_bindex_t bindex,
-+			   struct au_nhash *whlist, struct inode *dir)
-+{
-+	int rmdir_later, err, dirwh;
-+	struct dentry *h_dentry;
-+	struct super_block *sb;
-+	struct inode *inode;
-+
-+	sb = dentry->d_sb;
-+	SiMustAnyLock(sb);
-+	h_dentry = au_h_dptr(dentry, bindex);
-+	err = au_whtmp_ren(h_dentry, au_sbr(sb, bindex));
-+	if (unlikely(err))
-+		goto out;
-+
-+	/* stop monitoring */
-+	inode = d_inode(dentry);
-+	au_hn_free(au_hi(inode, bindex));
-+
-+	if (!au_test_fs_remote(h_dentry->d_sb)) {
-+		dirwh = au_sbi(sb)->si_dirwh;
-+		rmdir_later = (dirwh <= 1);
-+		if (!rmdir_later)
-+			rmdir_later = au_nhash_test_longer_wh(whlist, bindex,
-+							      dirwh);
-+		if (rmdir_later)
-+			return rmdir_later;
-+	}
-+
-+	err = au_whtmp_rmdir(dir, bindex, h_dentry, whlist);
-+	if (unlikely(err)) {
-+		AuIOErr("rmdir %pd, b%d failed, %d. ignored\n",
-+			h_dentry, bindex, err);
-+		err = 0;
-+	}
-+
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+/*
-+ * final procedure for deleting a entry.
-+ * maintain dentry and iattr.
-+ */
-+static void epilog(struct inode *dir, struct dentry *dentry,
-+		   aufs_bindex_t bindex)
-+{
-+	struct inode *inode;
-+
-+	inode = d_inode(dentry);
-+	d_drop(dentry);
-+	inode->i_ctime = dir->i_ctime;
-+
-+	au_dir_ts(dir, bindex);
-+	dir->i_version++;
-+}
-+
-+/*
-+ * when an error happened, remove the created whiteout and revert everything.
-+ */
-+static int do_revert(int err, struct inode *dir, aufs_bindex_t bindex,
-+		     aufs_bindex_t bwh, struct dentry *wh_dentry,
-+		     struct dentry *dentry, struct au_dtime *dt)
-+{
-+	int rerr;
-+	struct path h_path = {
-+		.dentry	= wh_dentry,
-+		.mnt	= au_sbr_mnt(dir->i_sb, bindex)
-+	};
-+
-+	rerr = au_wh_unlink_dentry(au_h_iptr(dir, bindex), &h_path, dentry);
-+	if (!rerr) {
-+		au_set_dbwh(dentry, bwh);
-+		au_dtime_revert(dt);
-+		return 0;
-+	}
-+
-+	AuIOErr("%pd reverting whiteout failed(%d, %d)\n", dentry, err, rerr);
-+	return -EIO;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+int aufs_unlink(struct inode *dir, struct dentry *dentry)
-+{
-+	int err;
-+	aufs_bindex_t bwh, bindex, bstart;
-+	struct inode *inode, *h_dir, *delegated;
-+	struct dentry *parent, *wh_dentry;
-+	/* to reuduce stack size */
-+	struct {
-+		struct au_dtime dt;
-+		struct au_pin pin;
-+		struct path h_path;
-+	} *a;
-+
-+	IMustLock(dir);
-+
-+	err = -ENOMEM;
-+	a = kmalloc(sizeof(*a), GFP_NOFS);
-+	if (unlikely(!a))
-+		goto out;
-+
-+	err = aufs_read_lock(dentry, AuLock_DW | AuLock_GEN);
-+	if (unlikely(err))
-+		goto out_free;
-+	err = au_d_hashed_positive(dentry);
-+	if (unlikely(err))
-+		goto out_unlock;
-+	inode = d_inode(dentry);
-+	IMustLock(inode);
-+	err = -EISDIR;
-+	if (unlikely(d_is_dir(dentry)))
-+		goto out_unlock; /* possible? */
-+
-+	bstart = au_dbstart(dentry);
-+	bwh = au_dbwh(dentry);
-+	bindex = -1;
-+	parent = dentry->d_parent; /* dir inode is locked */
-+	di_write_lock_parent(parent);
-+	wh_dentry = lock_hdir_create_wh(dentry, /*isdir*/0, &bindex, &a->dt,
-+					&a->pin);
-+	err = PTR_ERR(wh_dentry);
-+	if (IS_ERR(wh_dentry))
-+		goto out_parent;
-+
-+	a->h_path.mnt = au_sbr_mnt(dentry->d_sb, bstart);
-+	a->h_path.dentry = au_h_dptr(dentry, bstart);
-+	dget(a->h_path.dentry);
-+	if (bindex == bstart) {
-+		h_dir = au_pinned_h_dir(&a->pin);
-+		delegated = NULL;
-+		err = vfsub_unlink(h_dir, &a->h_path, &delegated, /*force*/0);
-+		if (unlikely(err == -EWOULDBLOCK)) {
-+			pr_warn("cannot retry for NFSv4 delegation"
-+				" for an internal unlink\n");
-+			iput(delegated);
-+		}
-+	} else {
-+		/* dir inode is locked */
-+		h_dir = d_inode(wh_dentry->d_parent);
-+		IMustLock(h_dir);
-+		err = 0;
-+	}
-+
-+	if (!err) {
-+		vfsub_drop_nlink(inode);
-+		epilog(dir, dentry, bindex);
-+
-+		/* update target timestamps */
-+		if (bindex == bstart) {
-+			vfsub_update_h_iattr(&a->h_path, /*did*/NULL);
-+			/*ignore*/
-+			inode->i_ctime = d_inode(a->h_path.dentry)->i_ctime;
-+		} else
-+			/* todo: this timestamp may be reverted later */
-+			inode->i_ctime = h_dir->i_ctime;
-+		goto out_unpin; /* success */
-+	}
-+
-+	/* revert */
-+	if (wh_dentry) {
-+		int rerr;
-+
-+		rerr = do_revert(err, dir, bindex, bwh, wh_dentry, dentry,
-+				 &a->dt);
-+		if (rerr)
-+			err = rerr;
-+	}
-+
-+out_unpin:
-+	au_unpin(&a->pin);
-+	dput(wh_dentry);
-+	dput(a->h_path.dentry);
-+out_parent:
-+	di_write_unlock(parent);
-+out_unlock:
-+	aufs_read_unlock(dentry, AuLock_DW);
-+out_free:
-+	kfree(a);
-+out:
-+	return err;
-+}
-+
-+int aufs_rmdir(struct inode *dir, struct dentry *dentry)
-+{
-+	int err, rmdir_later;
-+	aufs_bindex_t bwh, bindex, bstart;
-+	struct inode *inode;
-+	struct dentry *parent, *wh_dentry, *h_dentry;
-+	struct au_whtmp_rmdir *args;
-+	/* to reuduce stack size */
-+	struct {
-+		struct au_dtime dt;
-+		struct au_pin pin;
-+	} *a;
-+
-+	IMustLock(dir);
-+
-+	err = -ENOMEM;
-+	a = kmalloc(sizeof(*a), GFP_NOFS);
-+	if (unlikely(!a))
-+		goto out;
-+
-+	err = aufs_read_lock(dentry, AuLock_DW | AuLock_FLUSH | AuLock_GEN);
-+	if (unlikely(err))
-+		goto out_free;
-+	err = au_alive_dir(dentry);
-+	if (unlikely(err))
-+		goto out_unlock;
-+	inode = d_inode(dentry);
-+	IMustLock(inode);
-+	err = -ENOTDIR;
-+	if (unlikely(!d_is_dir(dentry)))
-+		goto out_unlock; /* possible? */
-+
-+	err = -ENOMEM;
-+	args = au_whtmp_rmdir_alloc(dir->i_sb, GFP_NOFS);
-+	if (unlikely(!args))
-+		goto out_unlock;
-+
-+	parent = dentry->d_parent; /* dir inode is locked */
-+	di_write_lock_parent(parent);
-+	err = au_test_empty(dentry, &args->whlist);
-+	if (unlikely(err))
-+		goto out_parent;
-+
-+	bstart = au_dbstart(dentry);
-+	bwh = au_dbwh(dentry);
-+	bindex = -1;
-+	wh_dentry = lock_hdir_create_wh(dentry, /*isdir*/1, &bindex, &a->dt,
-+					&a->pin);
-+	err = PTR_ERR(wh_dentry);
-+	if (IS_ERR(wh_dentry))
-+		goto out_parent;
-+
-+	h_dentry = au_h_dptr(dentry, bstart);
-+	dget(h_dentry);
-+	rmdir_later = 0;
-+	if (bindex == bstart) {
-+		err = renwh_and_rmdir(dentry, bstart, &args->whlist, dir);
-+		if (err > 0) {
-+			rmdir_later = err;
-+			err = 0;
-+		}
-+	} else {
-+		/* stop monitoring */
-+		au_hn_free(au_hi(inode, bstart));
-+
-+		/* dir inode is locked */
-+		IMustLock(d_inode(wh_dentry->d_parent));
-+		err = 0;
-+	}
-+
-+	if (!err) {
-+		vfsub_dead_dir(inode);
-+		au_set_dbdiropq(dentry, -1);
-+		epilog(dir, dentry, bindex);
-+
-+		if (rmdir_later) {
-+			au_whtmp_kick_rmdir(dir, bstart, h_dentry, args);
-+			args = NULL;
-+		}
-+
-+		goto out_unpin; /* success */
-+	}
-+
-+	/* revert */
-+	AuLabel(revert);
-+	if (wh_dentry) {
-+		int rerr;
-+
-+		rerr = do_revert(err, dir, bindex, bwh, wh_dentry, dentry,
-+				 &a->dt);
-+		if (rerr)
-+			err = rerr;
-+	}
-+
-+out_unpin:
-+	au_unpin(&a->pin);
-+	dput(wh_dentry);
-+	dput(h_dentry);
-+out_parent:
-+	di_write_unlock(parent);
-+	if (args)
-+		au_whtmp_rmdir_free(args);
-+out_unlock:
-+	aufs_read_unlock(dentry, AuLock_DW);
-+out_free:
-+	kfree(a);
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-diff -Nur linux-4.1.10.orig/fs/aufs/i_op_ren.c linux-4.1.10/fs/aufs/i_op_ren.c
---- linux-4.1.10.orig/fs/aufs/i_op_ren.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/i_op_ren.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,1017 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * inode operation (rename entry)
-+ * todo: this is crazy monster
-+ */
-+
-+#include "aufs.h"
-+
-+enum { AuSRC, AuDST, AuSrcDst };
-+enum { AuPARENT, AuCHILD, AuParentChild };
-+
-+#define AuRen_ISDIR	1
-+#define AuRen_ISSAMEDIR	(1 << 1)
-+#define AuRen_WHSRC	(1 << 2)
-+#define AuRen_WHDST	(1 << 3)
-+#define AuRen_MNT_WRITE	(1 << 4)
-+#define AuRen_DT_DSTDIR	(1 << 5)
-+#define AuRen_DIROPQ	(1 << 6)
-+#define au_ftest_ren(flags, name)	((flags) & AuRen_##name)
-+#define au_fset_ren(flags, name) \
-+	do { (flags) |= AuRen_##name; } while (0)
-+#define au_fclr_ren(flags, name) \
-+	do { (flags) &= ~AuRen_##name; } while (0)
-+
-+struct au_ren_args {
-+	struct {
-+		struct dentry *dentry, *h_dentry, *parent, *h_parent,
-+			*wh_dentry;
-+		struct inode *dir, *inode;
-+		struct au_hinode *hdir;
-+		struct au_dtime dt[AuParentChild];
-+		aufs_bindex_t bstart;
-+	} sd[AuSrcDst];
-+
-+#define src_dentry	sd[AuSRC].dentry
-+#define src_dir		sd[AuSRC].dir
-+#define src_inode	sd[AuSRC].inode
-+#define src_h_dentry	sd[AuSRC].h_dentry
-+#define src_parent	sd[AuSRC].parent
-+#define src_h_parent	sd[AuSRC].h_parent
-+#define src_wh_dentry	sd[AuSRC].wh_dentry
-+#define src_hdir	sd[AuSRC].hdir
-+#define src_h_dir	sd[AuSRC].hdir->hi_inode
-+#define src_dt		sd[AuSRC].dt
-+#define src_bstart	sd[AuSRC].bstart
-+
-+#define dst_dentry	sd[AuDST].dentry
-+#define dst_dir		sd[AuDST].dir
-+#define dst_inode	sd[AuDST].inode
-+#define dst_h_dentry	sd[AuDST].h_dentry
-+#define dst_parent	sd[AuDST].parent
-+#define dst_h_parent	sd[AuDST].h_parent
-+#define dst_wh_dentry	sd[AuDST].wh_dentry
-+#define dst_hdir	sd[AuDST].hdir
-+#define dst_h_dir	sd[AuDST].hdir->hi_inode
-+#define dst_dt		sd[AuDST].dt
-+#define dst_bstart	sd[AuDST].bstart
-+
-+	struct dentry *h_trap;
-+	struct au_branch *br;
-+	struct au_hinode *src_hinode;
-+	struct path h_path;
-+	struct au_nhash whlist;
-+	aufs_bindex_t btgt, src_bwh, src_bdiropq;
-+
-+	unsigned int flags;
-+
-+	struct au_whtmp_rmdir *thargs;
-+	struct dentry *h_dst;
-+};
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/*
-+ * functions for reverting.
-+ * when an error happened in a single rename systemcall, we should revert
-+ * everything as if nothing happened.
-+ * we don't need to revert the copied-up/down the parent dir since they are
-+ * harmless.
-+ */
-+
-+#define RevertFailure(fmt, ...) do { \
-+	AuIOErr("revert failure: " fmt " (%d, %d)\n", \
-+		##__VA_ARGS__, err, rerr); \
-+	err = -EIO; \
-+} while (0)
-+
-+static void au_ren_rev_diropq(int err, struct au_ren_args *a)
-+{
-+	int rerr;
-+
-+	au_hn_imtx_lock_nested(a->src_hinode, AuLsc_I_CHILD);
-+	rerr = au_diropq_remove(a->src_dentry, a->btgt);
-+	au_hn_imtx_unlock(a->src_hinode);
-+	au_set_dbdiropq(a->src_dentry, a->src_bdiropq);
-+	if (rerr)
-+		RevertFailure("remove diropq %pd", a->src_dentry);
-+}
-+
-+static void au_ren_rev_rename(int err, struct au_ren_args *a)
-+{
-+	int rerr;
-+	struct inode *delegated;
-+
-+	a->h_path.dentry = vfsub_lkup_one(&a->src_dentry->d_name,
-+					  a->src_h_parent);
-+	rerr = PTR_ERR(a->h_path.dentry);
-+	if (IS_ERR(a->h_path.dentry)) {
-+		RevertFailure("lkup one %pd", a->src_dentry);
-+		return;
-+	}
-+
-+	delegated = NULL;
-+	rerr = vfsub_rename(a->dst_h_dir,
-+			    au_h_dptr(a->src_dentry, a->btgt),
-+			    a->src_h_dir, &a->h_path, &delegated);
-+	if (unlikely(rerr == -EWOULDBLOCK)) {
-+		pr_warn("cannot retry for NFSv4 delegation"
-+			" for an internal rename\n");
-+		iput(delegated);
-+	}
-+	d_drop(a->h_path.dentry);
-+	dput(a->h_path.dentry);
-+	/* au_set_h_dptr(a->src_dentry, a->btgt, NULL); */
-+	if (rerr)
-+		RevertFailure("rename %pd", a->src_dentry);
-+}
-+
-+static void au_ren_rev_whtmp(int err, struct au_ren_args *a)
-+{
-+	int rerr;
-+	struct inode *delegated;
-+
-+	a->h_path.dentry = vfsub_lkup_one(&a->dst_dentry->d_name,
-+					  a->dst_h_parent);
-+	rerr = PTR_ERR(a->h_path.dentry);
-+	if (IS_ERR(a->h_path.dentry)) {
-+		RevertFailure("lkup one %pd", a->dst_dentry);
-+		return;
-+	}
-+	if (d_is_positive(a->h_path.dentry)) {
-+		d_drop(a->h_path.dentry);
-+		dput(a->h_path.dentry);
-+		return;
-+	}
-+
-+	delegated = NULL;
-+	rerr = vfsub_rename(a->dst_h_dir, a->h_dst, a->dst_h_dir, &a->h_path,
-+			    &delegated);
-+	if (unlikely(rerr == -EWOULDBLOCK)) {
-+		pr_warn("cannot retry for NFSv4 delegation"
-+			" for an internal rename\n");
-+		iput(delegated);
-+	}
-+	d_drop(a->h_path.dentry);
-+	dput(a->h_path.dentry);
-+	if (!rerr)
-+		au_set_h_dptr(a->dst_dentry, a->btgt, dget(a->h_dst));
-+	else
-+		RevertFailure("rename %pd", a->h_dst);
-+}
-+
-+static void au_ren_rev_whsrc(int err, struct au_ren_args *a)
-+{
-+	int rerr;
-+
-+	a->h_path.dentry = a->src_wh_dentry;
-+	rerr = au_wh_unlink_dentry(a->src_h_dir, &a->h_path, a->src_dentry);
-+	au_set_dbwh(a->src_dentry, a->src_bwh);
-+	if (rerr)
-+		RevertFailure("unlink %pd", a->src_wh_dentry);
-+}
-+#undef RevertFailure
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/*
-+ * when we have to copyup the renaming entry, do it with the rename-target name
-+ * in order to minimize the cost (the later actual rename is unnecessary).
-+ * otherwise rename it on the target branch.
-+ */
-+static int au_ren_or_cpup(struct au_ren_args *a)
-+{
-+	int err;
-+	struct dentry *d;
-+	struct inode *delegated;
-+
-+	d = a->src_dentry;
-+	if (au_dbstart(d) == a->btgt) {
-+		a->h_path.dentry = a->dst_h_dentry;
-+		if (au_ftest_ren(a->flags, DIROPQ)
-+		    && au_dbdiropq(d) == a->btgt)
-+			au_fclr_ren(a->flags, DIROPQ);
-+		AuDebugOn(au_dbstart(d) != a->btgt);
-+		delegated = NULL;
-+		err = vfsub_rename(a->src_h_dir, au_h_dptr(d, a->btgt),
-+				   a->dst_h_dir, &a->h_path, &delegated);
-+		if (unlikely(err == -EWOULDBLOCK)) {
-+			pr_warn("cannot retry for NFSv4 delegation"
-+				" for an internal rename\n");
-+			iput(delegated);
-+		}
-+	} else
-+		BUG();
-+
-+	if (!err && a->h_dst)
-+		/* it will be set to dinfo later */
-+		dget(a->h_dst);
-+
-+	return err;
-+}
-+
-+/* cf. aufs_rmdir() */
-+static int au_ren_del_whtmp(struct au_ren_args *a)
-+{
-+	int err;
-+	struct inode *dir;
-+
-+	dir = a->dst_dir;
-+	SiMustAnyLock(dir->i_sb);
-+	if (!au_nhash_test_longer_wh(&a->whlist, a->btgt,
-+				     au_sbi(dir->i_sb)->si_dirwh)
-+	    || au_test_fs_remote(a->h_dst->d_sb)) {
-+		err = au_whtmp_rmdir(dir, a->btgt, a->h_dst, &a->whlist);
-+		if (unlikely(err))
-+			pr_warn("failed removing whtmp dir %pd (%d), "
-+				"ignored.\n", a->h_dst, err);
-+	} else {
-+		au_nhash_wh_free(&a->thargs->whlist);
-+		a->thargs->whlist = a->whlist;
-+		a->whlist.nh_num = 0;
-+		au_whtmp_kick_rmdir(dir, a->btgt, a->h_dst, a->thargs);
-+		dput(a->h_dst);
-+		a->thargs = NULL;
-+	}
-+
-+	return 0;
-+}
-+
-+/* make it 'opaque' dir. */
-+static int au_ren_diropq(struct au_ren_args *a)
-+{
-+	int err;
-+	struct dentry *diropq;
-+
-+	err = 0;
-+	a->src_bdiropq = au_dbdiropq(a->src_dentry);
-+	a->src_hinode = au_hi(a->src_inode, a->btgt);
-+	au_hn_imtx_lock_nested(a->src_hinode, AuLsc_I_CHILD);
-+	diropq = au_diropq_create(a->src_dentry, a->btgt);
-+	au_hn_imtx_unlock(a->src_hinode);
-+	if (IS_ERR(diropq))
-+		err = PTR_ERR(diropq);
-+	else
-+		dput(diropq);
-+
-+	return err;
-+}
-+
-+static int do_rename(struct au_ren_args *a)
-+{
-+	int err;
-+	struct dentry *d, *h_d;
-+
-+	/* prepare workqueue args for asynchronous rmdir */
-+	h_d = a->dst_h_dentry;
-+	if (au_ftest_ren(a->flags, ISDIR) && d_is_positive(h_d)) {
-+		err = -ENOMEM;
-+		a->thargs = au_whtmp_rmdir_alloc(a->src_dentry->d_sb, GFP_NOFS);
-+		if (unlikely(!a->thargs))
-+			goto out;
-+		a->h_dst = dget(h_d);
-+	}
-+
-+	/* create whiteout for src_dentry */
-+	if (au_ftest_ren(a->flags, WHSRC)) {
-+		a->src_bwh = au_dbwh(a->src_dentry);
-+		AuDebugOn(a->src_bwh >= 0);
-+		a->src_wh_dentry
-+			= au_wh_create(a->src_dentry, a->btgt, a->src_h_parent);
-+		err = PTR_ERR(a->src_wh_dentry);
-+		if (IS_ERR(a->src_wh_dentry))
-+			goto out_thargs;
-+	}
-+
-+	/* lookup whiteout for dentry */
-+	if (au_ftest_ren(a->flags, WHDST)) {
-+		h_d = au_wh_lkup(a->dst_h_parent, &a->dst_dentry->d_name,
-+				 a->br);
-+		err = PTR_ERR(h_d);
-+		if (IS_ERR(h_d))
-+			goto out_whsrc;
-+		if (d_is_negative(h_d))
-+			dput(h_d);
-+		else
-+			a->dst_wh_dentry = h_d;
-+	}
-+
-+	/* rename dentry to tmpwh */
-+	if (a->thargs) {
-+		err = au_whtmp_ren(a->dst_h_dentry, a->br);
-+		if (unlikely(err))
-+			goto out_whdst;
-+
-+		d = a->dst_dentry;
-+		au_set_h_dptr(d, a->btgt, NULL);
-+		err = au_lkup_neg(d, a->btgt, /*wh*/0);
-+		if (unlikely(err))
-+			goto out_whtmp;
-+		a->dst_h_dentry = au_h_dptr(d, a->btgt);
-+	}
-+
-+	BUG_ON(d_is_positive(a->dst_h_dentry) && a->src_bstart != a->btgt);
-+
-+	/* rename by vfs_rename or cpup */
-+	d = a->dst_dentry;
-+	if (au_ftest_ren(a->flags, ISDIR)
-+	    && (a->dst_wh_dentry
-+		|| au_dbdiropq(d) == a->btgt
-+		/* hide the lower to keep xino */
-+		|| a->btgt < au_dbend(d)
-+		|| au_opt_test(au_mntflags(d->d_sb), ALWAYS_DIROPQ)))
-+		au_fset_ren(a->flags, DIROPQ);
-+	err = au_ren_or_cpup(a);
-+	if (unlikely(err))
-+		/* leave the copied-up one */
-+		goto out_whtmp;
-+
-+	/* make dir opaque */
-+	if (au_ftest_ren(a->flags, DIROPQ)) {
-+		err = au_ren_diropq(a);
-+		if (unlikely(err))
-+			goto out_rename;
-+	}
-+
-+	/* update target timestamps */
-+	AuDebugOn(au_dbstart(a->src_dentry) != a->btgt);
-+	a->h_path.dentry = au_h_dptr(a->src_dentry, a->btgt);
-+	vfsub_update_h_iattr(&a->h_path, /*did*/NULL); /*ignore*/
-+	a->src_inode->i_ctime = d_inode(a->h_path.dentry)->i_ctime;
-+
-+	/* remove whiteout for dentry */
-+	if (a->dst_wh_dentry) {
-+		a->h_path.dentry = a->dst_wh_dentry;
-+		err = au_wh_unlink_dentry(a->dst_h_dir, &a->h_path,
-+					  a->dst_dentry);
-+		if (unlikely(err))
-+			goto out_diropq;
-+	}
-+
-+	/* remove whtmp */
-+	if (a->thargs)
-+		au_ren_del_whtmp(a); /* ignore this error */
-+
-+	au_fhsm_wrote(a->src_dentry->d_sb, a->btgt, /*force*/0);
-+	err = 0;
-+	goto out_success;
-+
-+out_diropq:
-+	if (au_ftest_ren(a->flags, DIROPQ))
-+		au_ren_rev_diropq(err, a);
-+out_rename:
-+	au_ren_rev_rename(err, a);
-+	dput(a->h_dst);
-+out_whtmp:
-+	if (a->thargs)
-+		au_ren_rev_whtmp(err, a);
-+out_whdst:
-+	dput(a->dst_wh_dentry);
-+	a->dst_wh_dentry = NULL;
-+out_whsrc:
-+	if (a->src_wh_dentry)
-+		au_ren_rev_whsrc(err, a);
-+out_success:
-+	dput(a->src_wh_dentry);
-+	dput(a->dst_wh_dentry);
-+out_thargs:
-+	if (a->thargs) {
-+		dput(a->h_dst);
-+		au_whtmp_rmdir_free(a->thargs);
-+		a->thargs = NULL;
-+	}
-+out:
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/*
-+ * test if @dentry dir can be rename destination or not.
-+ * success means, it is a logically empty dir.
-+ */
-+static int may_rename_dstdir(struct dentry *dentry, struct au_nhash *whlist)
-+{
-+	return au_test_empty(dentry, whlist);
-+}
-+
-+/*
-+ * test if @dentry dir can be rename source or not.
-+ * if it can, return 0 and @children is filled.
-+ * success means,
-+ * - it is a logically empty dir.
-+ * - or, it exists on writable branch and has no children including whiteouts
-+ *       on the lower branch.
-+ */
-+static int may_rename_srcdir(struct dentry *dentry, aufs_bindex_t btgt)
-+{
-+	int err;
-+	unsigned int rdhash;
-+	aufs_bindex_t bstart;
-+
-+	bstart = au_dbstart(dentry);
-+	if (bstart != btgt) {
-+		struct au_nhash whlist;
-+
-+		SiMustAnyLock(dentry->d_sb);
-+		rdhash = au_sbi(dentry->d_sb)->si_rdhash;
-+		if (!rdhash)
-+			rdhash = au_rdhash_est(au_dir_size(/*file*/NULL,
-+							   dentry));
-+		err = au_nhash_alloc(&whlist, rdhash, GFP_NOFS);
-+		if (unlikely(err))
-+			goto out;
-+		err = au_test_empty(dentry, &whlist);
-+		au_nhash_wh_free(&whlist);
-+		goto out;
-+	}
-+
-+	if (bstart == au_dbtaildir(dentry))
-+		return 0; /* success */
-+
-+	err = au_test_empty_lower(dentry);
-+
-+out:
-+	if (err == -ENOTEMPTY) {
-+		AuWarn1("renaming dir who has child(ren) on multiple branches,"
-+			" is not supported\n");
-+		err = -EXDEV;
-+	}
-+	return err;
-+}
-+
-+/* side effect: sets whlist and h_dentry */
-+static int au_ren_may_dir(struct au_ren_args *a)
-+{
-+	int err;
-+	unsigned int rdhash;
-+	struct dentry *d;
-+
-+	d = a->dst_dentry;
-+	SiMustAnyLock(d->d_sb);
-+
-+	err = 0;
-+	if (au_ftest_ren(a->flags, ISDIR) && a->dst_inode) {
-+		rdhash = au_sbi(d->d_sb)->si_rdhash;
-+		if (!rdhash)
-+			rdhash = au_rdhash_est(au_dir_size(/*file*/NULL, d));
-+		err = au_nhash_alloc(&a->whlist, rdhash, GFP_NOFS);
-+		if (unlikely(err))
-+			goto out;
-+
-+		au_set_dbstart(d, a->dst_bstart);
-+		err = may_rename_dstdir(d, &a->whlist);
-+		au_set_dbstart(d, a->btgt);
-+	}
-+	a->dst_h_dentry = au_h_dptr(d, au_dbstart(d));
-+	if (unlikely(err))
-+		goto out;
-+
-+	d = a->src_dentry;
-+	a->src_h_dentry = au_h_dptr(d, au_dbstart(d));
-+	if (au_ftest_ren(a->flags, ISDIR)) {
-+		err = may_rename_srcdir(d, a->btgt);
-+		if (unlikely(err)) {
-+			au_nhash_wh_free(&a->whlist);
-+			a->whlist.nh_num = 0;
-+		}
-+	}
-+out:
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/*
-+ * simple tests for rename.
-+ * following the checks in vfs, plus the parent-child relationship.
-+ */
-+static int au_may_ren(struct au_ren_args *a)
-+{
-+	int err, isdir;
-+	struct inode *h_inode;
-+
-+	if (a->src_bstart == a->btgt) {
-+		err = au_may_del(a->src_dentry, a->btgt, a->src_h_parent,
-+				 au_ftest_ren(a->flags, ISDIR));
-+		if (unlikely(err))
-+			goto out;
-+		err = -EINVAL;
-+		if (unlikely(a->src_h_dentry == a->h_trap))
-+			goto out;
-+	}
-+
-+	err = 0;
-+	if (a->dst_bstart != a->btgt)
-+		goto out;
-+
-+	err = -ENOTEMPTY;
-+	if (unlikely(a->dst_h_dentry == a->h_trap))
-+		goto out;
-+
-+	err = -EIO;
-+	isdir = !!au_ftest_ren(a->flags, ISDIR);
-+	if (d_really_is_negative(a->dst_dentry)) {
-+		if (d_is_negative(a->dst_h_dentry))
-+			err = au_may_add(a->dst_dentry, a->btgt,
-+					 a->dst_h_parent, isdir);
-+	} else {
-+		if (unlikely(d_is_negative(a->dst_h_dentry)))
-+			goto out;
-+		h_inode = d_inode(a->dst_h_dentry);
-+		if (h_inode->i_nlink)
-+			err = au_may_del(a->dst_dentry, a->btgt,
-+					 a->dst_h_parent, isdir);
-+	}
-+
-+out:
-+	if (unlikely(err == -ENOENT || err == -EEXIST))
-+		err = -EIO;
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/*
-+ * locking order
-+ * (VFS)
-+ * - src_dir and dir by lock_rename()
-+ * - inode if exitsts
-+ * (aufs)
-+ * - lock all
-+ *   + src_dentry and dentry by aufs_read_and_write_lock2() which calls,
-+ *     + si_read_lock
-+ *     + di_write_lock2_child()
-+ *       + di_write_lock_child()
-+ *	   + ii_write_lock_child()
-+ *       + di_write_lock_child2()
-+ *	   + ii_write_lock_child2()
-+ *     + src_parent and parent
-+ *       + di_write_lock_parent()
-+ *	   + ii_write_lock_parent()
-+ *       + di_write_lock_parent2()
-+ *	   + ii_write_lock_parent2()
-+ *   + lower src_dir and dir by vfsub_lock_rename()
-+ *   + verify the every relationships between child and parent. if any
-+ *     of them failed, unlock all and return -EBUSY.
-+ */
-+static void au_ren_unlock(struct au_ren_args *a)
-+{
-+	vfsub_unlock_rename(a->src_h_parent, a->src_hdir,
-+			    a->dst_h_parent, a->dst_hdir);
-+	if (au_ftest_ren(a->flags, MNT_WRITE))
-+		vfsub_mnt_drop_write(au_br_mnt(a->br));
-+}
-+
-+static int au_ren_lock(struct au_ren_args *a)
-+{
-+	int err;
-+	unsigned int udba;
-+
-+	err = 0;
-+	a->src_h_parent = au_h_dptr(a->src_parent, a->btgt);
-+	a->src_hdir = au_hi(a->src_dir, a->btgt);
-+	a->dst_h_parent = au_h_dptr(a->dst_parent, a->btgt);
-+	a->dst_hdir = au_hi(a->dst_dir, a->btgt);
-+
-+	err = vfsub_mnt_want_write(au_br_mnt(a->br));
-+	if (unlikely(err))
-+		goto out;
-+	au_fset_ren(a->flags, MNT_WRITE);
-+	a->h_trap = vfsub_lock_rename(a->src_h_parent, a->src_hdir,
-+				      a->dst_h_parent, a->dst_hdir);
-+	udba = au_opt_udba(a->src_dentry->d_sb);
-+	if (unlikely(a->src_hdir->hi_inode != d_inode(a->src_h_parent)
-+		     || a->dst_hdir->hi_inode != d_inode(a->dst_h_parent)))
-+		err = au_busy_or_stale();
-+	if (!err && au_dbstart(a->src_dentry) == a->btgt)
-+		err = au_h_verify(a->src_h_dentry, udba,
-+				  d_inode(a->src_h_parent), a->src_h_parent,
-+				  a->br);
-+	if (!err && au_dbstart(a->dst_dentry) == a->btgt)
-+		err = au_h_verify(a->dst_h_dentry, udba,
-+				  d_inode(a->dst_h_parent), a->dst_h_parent,
-+				  a->br);
-+	if (!err)
-+		goto out; /* success */
-+
-+	err = au_busy_or_stale();
-+	au_ren_unlock(a);
-+
-+out:
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static void au_ren_refresh_dir(struct au_ren_args *a)
-+{
-+	struct inode *dir;
-+
-+	dir = a->dst_dir;
-+	dir->i_version++;
-+	if (au_ftest_ren(a->flags, ISDIR)) {
-+		/* is this updating defined in POSIX? */
-+		au_cpup_attr_timesizes(a->src_inode);
-+		au_cpup_attr_nlink(dir, /*force*/1);
-+	}
-+
-+	au_dir_ts(dir, a->btgt);
-+
-+	if (au_ftest_ren(a->flags, ISSAMEDIR))
-+		return;
-+
-+	dir = a->src_dir;
-+	dir->i_version++;
-+	if (au_ftest_ren(a->flags, ISDIR))
-+		au_cpup_attr_nlink(dir, /*force*/1);
-+	au_dir_ts(dir, a->btgt);
-+}
-+
-+static void au_ren_refresh(struct au_ren_args *a)
-+{
-+	aufs_bindex_t bend, bindex;
-+	struct dentry *d, *h_d;
-+	struct inode *i, *h_i;
-+	struct super_block *sb;
-+
-+	d = a->dst_dentry;
-+	d_drop(d);
-+	if (a->h_dst)
-+		/* already dget-ed by au_ren_or_cpup() */
-+		au_set_h_dptr(d, a->btgt, a->h_dst);
-+
-+	i = a->dst_inode;
-+	if (i) {
-+		if (!au_ftest_ren(a->flags, ISDIR))
-+			vfsub_drop_nlink(i);
-+		else {
-+			vfsub_dead_dir(i);
-+			au_cpup_attr_timesizes(i);
-+		}
-+		au_update_dbrange(d, /*do_put_zero*/1);
-+	} else {
-+		bend = a->btgt;
-+		for (bindex = au_dbstart(d); bindex < bend; bindex++)
-+			au_set_h_dptr(d, bindex, NULL);
-+		bend = au_dbend(d);
-+		for (bindex = a->btgt + 1; bindex <= bend; bindex++)
-+			au_set_h_dptr(d, bindex, NULL);
-+		au_update_dbrange(d, /*do_put_zero*/0);
-+	}
-+
-+	d = a->src_dentry;
-+	au_set_dbwh(d, -1);
-+	bend = au_dbend(d);
-+	for (bindex = a->btgt + 1; bindex <= bend; bindex++) {
-+		h_d = au_h_dptr(d, bindex);
-+		if (h_d)
-+			au_set_h_dptr(d, bindex, NULL);
-+	}
-+	au_set_dbend(d, a->btgt);
-+
-+	sb = d->d_sb;
-+	i = a->src_inode;
-+	if (au_opt_test(au_mntflags(sb), PLINK) && au_plink_test(i))
-+		return; /* success */
-+
-+	bend = au_ibend(i);
-+	for (bindex = a->btgt + 1; bindex <= bend; bindex++) {
-+		h_i = au_h_iptr(i, bindex);
-+		if (h_i) {
-+			au_xino_write(sb, bindex, h_i->i_ino, /*ino*/0);
-+			/* ignore this error */
-+			au_set_h_iptr(i, bindex, NULL, 0);
-+		}
-+	}
-+	au_set_ibend(i, a->btgt);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* mainly for link(2) and rename(2) */
-+int au_wbr(struct dentry *dentry, aufs_bindex_t btgt)
-+{
-+	aufs_bindex_t bdiropq, bwh;
-+	struct dentry *parent;
-+	struct au_branch *br;
-+
-+	parent = dentry->d_parent;
-+	IMustLock(d_inode(parent)); /* dir is locked */
-+
-+	bdiropq = au_dbdiropq(parent);
-+	bwh = au_dbwh(dentry);
-+	br = au_sbr(dentry->d_sb, btgt);
-+	if (au_br_rdonly(br)
-+	    || (0 <= bdiropq && bdiropq < btgt)
-+	    || (0 <= bwh && bwh < btgt))
-+		btgt = -1;
-+
-+	AuDbg("btgt %d\n", btgt);
-+	return btgt;
-+}
-+
-+/* sets src_bstart, dst_bstart and btgt */
-+static int au_ren_wbr(struct au_ren_args *a)
-+{
-+	int err;
-+	struct au_wr_dir_args wr_dir_args = {
-+		/* .force_btgt	= -1, */
-+		.flags		= AuWrDir_ADD_ENTRY
-+	};
-+
-+	a->src_bstart = au_dbstart(a->src_dentry);
-+	a->dst_bstart = au_dbstart(a->dst_dentry);
-+	if (au_ftest_ren(a->flags, ISDIR))
-+		au_fset_wrdir(wr_dir_args.flags, ISDIR);
-+	wr_dir_args.force_btgt = a->src_bstart;
-+	if (a->dst_inode && a->dst_bstart < a->src_bstart)
-+		wr_dir_args.force_btgt = a->dst_bstart;
-+	wr_dir_args.force_btgt = au_wbr(a->dst_dentry, wr_dir_args.force_btgt);
-+	err = au_wr_dir(a->dst_dentry, a->src_dentry, &wr_dir_args);
-+	a->btgt = err;
-+
-+	return err;
-+}
-+
-+static void au_ren_dt(struct au_ren_args *a)
-+{
-+	a->h_path.dentry = a->src_h_parent;
-+	au_dtime_store(a->src_dt + AuPARENT, a->src_parent, &a->h_path);
-+	if (!au_ftest_ren(a->flags, ISSAMEDIR)) {
-+		a->h_path.dentry = a->dst_h_parent;
-+		au_dtime_store(a->dst_dt + AuPARENT, a->dst_parent, &a->h_path);
-+	}
-+
-+	au_fclr_ren(a->flags, DT_DSTDIR);
-+	if (!au_ftest_ren(a->flags, ISDIR))
-+		return;
-+
-+	a->h_path.dentry = a->src_h_dentry;
-+	au_dtime_store(a->src_dt + AuCHILD, a->src_dentry, &a->h_path);
-+	if (d_is_positive(a->dst_h_dentry)) {
-+		au_fset_ren(a->flags, DT_DSTDIR);
-+		a->h_path.dentry = a->dst_h_dentry;
-+		au_dtime_store(a->dst_dt + AuCHILD, a->dst_dentry, &a->h_path);
-+	}
-+}
-+
-+static void au_ren_rev_dt(int err, struct au_ren_args *a)
-+{
-+	struct dentry *h_d;
-+	struct mutex *h_mtx;
-+
-+	au_dtime_revert(a->src_dt + AuPARENT);
-+	if (!au_ftest_ren(a->flags, ISSAMEDIR))
-+		au_dtime_revert(a->dst_dt + AuPARENT);
-+
-+	if (au_ftest_ren(a->flags, ISDIR) && err != -EIO) {
-+		h_d = a->src_dt[AuCHILD].dt_h_path.dentry;
-+		h_mtx = &d_inode(h_d)->i_mutex;
-+		mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
-+		au_dtime_revert(a->src_dt + AuCHILD);
-+		mutex_unlock(h_mtx);
-+
-+		if (au_ftest_ren(a->flags, DT_DSTDIR)) {
-+			h_d = a->dst_dt[AuCHILD].dt_h_path.dentry;
-+			h_mtx = &d_inode(h_d)->i_mutex;
-+			mutex_lock_nested(h_mtx, AuLsc_I_CHILD);
-+			au_dtime_revert(a->dst_dt + AuCHILD);
-+			mutex_unlock(h_mtx);
-+		}
-+	}
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+int aufs_rename(struct inode *_src_dir, struct dentry *_src_dentry,
-+		struct inode *_dst_dir, struct dentry *_dst_dentry)
-+{
-+	int err, flags;
-+	/* reduce stack space */
-+	struct au_ren_args *a;
-+
-+	AuDbg("%pd, %pd\n", _src_dentry, _dst_dentry);
-+	IMustLock(_src_dir);
-+	IMustLock(_dst_dir);
-+
-+	err = -ENOMEM;
-+	BUILD_BUG_ON(sizeof(*a) > PAGE_SIZE);
-+	a = kzalloc(sizeof(*a), GFP_NOFS);
-+	if (unlikely(!a))
-+		goto out;
-+
-+	a->src_dir = _src_dir;
-+	a->src_dentry = _src_dentry;
-+	a->src_inode = NULL;
-+	if (d_really_is_positive(a->src_dentry))
-+		a->src_inode = d_inode(a->src_dentry);
-+	a->src_parent = a->src_dentry->d_parent; /* dir inode is locked */
-+	a->dst_dir = _dst_dir;
-+	a->dst_dentry = _dst_dentry;
-+	a->dst_inode = NULL;
-+	if (d_really_is_positive(a->dst_dentry))
-+		a->dst_inode = d_inode(a->dst_dentry);
-+	a->dst_parent = a->dst_dentry->d_parent; /* dir inode is locked */
-+	if (a->dst_inode) {
-+		IMustLock(a->dst_inode);
-+		au_igrab(a->dst_inode);
-+	}
-+
-+	err = -ENOTDIR;
-+	flags = AuLock_FLUSH | AuLock_NOPLM | AuLock_GEN;
-+	if (d_is_dir(a->src_dentry)) {
-+		au_fset_ren(a->flags, ISDIR);
-+		if (unlikely(d_really_is_positive(a->dst_dentry)
-+			     && !d_is_dir(a->dst_dentry)))
-+			goto out_free;
-+		err = aufs_read_and_write_lock2(a->dst_dentry, a->src_dentry,
-+						AuLock_DIR | flags);
-+	} else
-+		err = aufs_read_and_write_lock2(a->dst_dentry, a->src_dentry,
-+						flags);
-+	if (unlikely(err))
-+		goto out_free;
-+
-+	err = au_d_hashed_positive(a->src_dentry);
-+	if (unlikely(err))
-+		goto out_unlock;
-+	err = -ENOENT;
-+	if (a->dst_inode) {
-+		/*
-+		 * If it is a dir, VFS unhash dst_dentry before this
-+		 * function. It means we cannot rely upon d_unhashed().
-+		 */
-+		if (unlikely(!a->dst_inode->i_nlink))
-+			goto out_unlock;
-+		if (!S_ISDIR(a->dst_inode->i_mode)) {
-+			err = au_d_hashed_positive(a->dst_dentry);
-+			if (unlikely(err))
-+				goto out_unlock;
-+		} else if (unlikely(IS_DEADDIR(a->dst_inode)))
-+			goto out_unlock;
-+	} else if (unlikely(d_unhashed(a->dst_dentry)))
-+		goto out_unlock;
-+
-+	/*
-+	 * is it possible?
-+	 * yes, it happened (in linux-3.3-rcN) but I don't know why.
-+	 * there may exist a problem somewhere else.
-+	 */
-+	err = -EINVAL;
-+	if (unlikely(d_inode(a->dst_parent) == d_inode(a->src_dentry)))
-+		goto out_unlock;
-+
-+	au_fset_ren(a->flags, ISSAMEDIR); /* temporary */
-+	di_write_lock_parent(a->dst_parent);
-+
-+	/* which branch we process */
-+	err = au_ren_wbr(a);
-+	if (unlikely(err < 0))
-+		goto out_parent;
-+	a->br = au_sbr(a->dst_dentry->d_sb, a->btgt);
-+	a->h_path.mnt = au_br_mnt(a->br);
-+
-+	/* are they available to be renamed */
-+	err = au_ren_may_dir(a);
-+	if (unlikely(err))
-+		goto out_children;
-+
-+	/* prepare the writable parent dir on the same branch */
-+	if (a->dst_bstart == a->btgt) {
-+		au_fset_ren(a->flags, WHDST);
-+	} else {
-+		err = au_cpup_dirs(a->dst_dentry, a->btgt);
-+		if (unlikely(err))
-+			goto out_children;
-+	}
-+
-+	if (a->src_dir != a->dst_dir) {
-+		/*
-+		 * this temporary unlock is safe,
-+		 * because both dir->i_mutex are locked.
-+		 */
-+		di_write_unlock(a->dst_parent);
-+		di_write_lock_parent(a->src_parent);
-+		err = au_wr_dir_need_wh(a->src_dentry,
-+					au_ftest_ren(a->flags, ISDIR),
-+					&a->btgt);
-+		di_write_unlock(a->src_parent);
-+		di_write_lock2_parent(a->src_parent, a->dst_parent, /*isdir*/1);
-+		au_fclr_ren(a->flags, ISSAMEDIR);
-+	} else
-+		err = au_wr_dir_need_wh(a->src_dentry,
-+					au_ftest_ren(a->flags, ISDIR),
-+					&a->btgt);
-+	if (unlikely(err < 0))
-+		goto out_children;
-+	if (err)
-+		au_fset_ren(a->flags, WHSRC);
-+
-+	/* cpup src */
-+	if (a->src_bstart != a->btgt) {
-+		struct au_pin pin;
-+
-+		err = au_pin(&pin, a->src_dentry, a->btgt,
-+			     au_opt_udba(a->src_dentry->d_sb),
-+			     AuPin_DI_LOCKED | AuPin_MNT_WRITE);
-+		if (!err) {
-+			struct au_cp_generic cpg = {
-+				.dentry	= a->src_dentry,
-+				.bdst	= a->btgt,
-+				.bsrc	= a->src_bstart,
-+				.len	= -1,
-+				.pin	= &pin,
-+				.flags	= AuCpup_DTIME | AuCpup_HOPEN
-+			};
-+			AuDebugOn(au_dbstart(a->src_dentry) != a->src_bstart);
-+			err = au_sio_cpup_simple(&cpg);
-+			au_unpin(&pin);
-+		}
-+		if (unlikely(err))
-+			goto out_children;
-+		a->src_bstart = a->btgt;
-+		a->src_h_dentry = au_h_dptr(a->src_dentry, a->btgt);
-+		au_fset_ren(a->flags, WHSRC);
-+	}
-+
-+	/* lock them all */
-+	err = au_ren_lock(a);
-+	if (unlikely(err))
-+		/* leave the copied-up one */
-+		goto out_children;
-+
-+	if (!au_opt_test(au_mntflags(a->dst_dir->i_sb), UDBA_NONE))
-+		err = au_may_ren(a);
-+	else if (unlikely(a->dst_dentry->d_name.len > AUFS_MAX_NAMELEN))
-+		err = -ENAMETOOLONG;
-+	if (unlikely(err))
-+		goto out_hdir;
-+
-+	/* store timestamps to be revertible */
-+	au_ren_dt(a);
-+
-+	/* here we go */
-+	err = do_rename(a);
-+	if (unlikely(err))
-+		goto out_dt;
-+
-+	/* update dir attributes */
-+	au_ren_refresh_dir(a);
-+
-+	/* dput/iput all lower dentries */
-+	au_ren_refresh(a);
-+
-+	goto out_hdir; /* success */
-+
-+out_dt:
-+	au_ren_rev_dt(err, a);
-+out_hdir:
-+	au_ren_unlock(a);
-+out_children:
-+	au_nhash_wh_free(&a->whlist);
-+	if (err && a->dst_inode && a->dst_bstart != a->btgt) {
-+		AuDbg("bstart %d, btgt %d\n", a->dst_bstart, a->btgt);
-+		au_set_h_dptr(a->dst_dentry, a->btgt, NULL);
-+		au_set_dbstart(a->dst_dentry, a->dst_bstart);
-+	}
-+out_parent:
-+	if (!err)
-+		d_move(a->src_dentry, a->dst_dentry);
-+	else {
-+		au_update_dbstart(a->dst_dentry);
-+		if (!a->dst_inode)
-+			d_drop(a->dst_dentry);
-+	}
-+	if (au_ftest_ren(a->flags, ISSAMEDIR))
-+		di_write_unlock(a->dst_parent);
-+	else
-+		di_write_unlock2(a->src_parent, a->dst_parent);
-+out_unlock:
-+	aufs_read_and_write_unlock2(a->dst_dentry, a->src_dentry);
-+out_free:
-+	iput(a->dst_inode);
-+	if (a->thargs)
-+		au_whtmp_rmdir_free(a->thargs);
-+	kfree(a);
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-diff -Nur linux-4.1.10.orig/fs/aufs/Kconfig linux-4.1.10/fs/aufs/Kconfig
---- linux-4.1.10.orig/fs/aufs/Kconfig	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/Kconfig	2015-10-22 21:36:44.000000000 +0200
-@@ -0,0 +1,185 @@
-+config AUFS_FS
-+	tristate "Aufs (Advanced multi layered unification filesystem) support"
-+	help
-+	Aufs is a stackable unification filesystem such as Unionfs,
-+	which unifies several directories and provides a merged single
-+	directory.
-+	In the early days, aufs was entirely re-designed and
-+	re-implemented Unionfs Version 1.x series. Introducing many
-+	original ideas, approaches and improvements, it becomes totally
-+	different from Unionfs while keeping the basic features.
-+
-+if AUFS_FS
-+choice
-+	prompt "Maximum number of branches"
-+	default AUFS_BRANCH_MAX_127
-+	help
-+	Specifies the maximum number of branches (or member directories)
-+	in a single aufs. The larger value consumes more system
-+	resources and has a minor impact to performance.
-+config AUFS_BRANCH_MAX_127
-+	bool "127"
-+	help
-+	Specifies the maximum number of branches (or member directories)
-+	in a single aufs. The larger value consumes more system
-+	resources and has a minor impact to performance.
-+config AUFS_BRANCH_MAX_511
-+	bool "511"
-+	help
-+	Specifies the maximum number of branches (or member directories)
-+	in a single aufs. The larger value consumes more system
-+	resources and has a minor impact to performance.
-+config AUFS_BRANCH_MAX_1023
-+	bool "1023"
-+	help
-+	Specifies the maximum number of branches (or member directories)
-+	in a single aufs. The larger value consumes more system
-+	resources and has a minor impact to performance.
-+config AUFS_BRANCH_MAX_32767
-+	bool "32767"
-+	help
-+	Specifies the maximum number of branches (or member directories)
-+	in a single aufs. The larger value consumes more system
-+	resources and has a minor impact to performance.
-+endchoice
-+
-+config AUFS_SBILIST
-+	bool
-+	depends on AUFS_MAGIC_SYSRQ || PROC_FS
-+	default y
-+	help
-+	Automatic configuration for internal use.
-+	When aufs supports Magic SysRq or /proc, enabled automatically.
-+
-+config AUFS_HNOTIFY
-+	bool "Detect direct branch access (bypassing aufs)"
-+	help
-+	If you want to modify files on branches directly, eg. bypassing aufs,
-+	and want aufs to detect the changes of them fully, then enable this
-+	option and use 'udba=notify' mount option.
-+	Currently there is only one available configuration, "fsnotify".
-+	It will have a negative impact to the performance.
-+	See detail in aufs.5.
-+
-+choice
-+	prompt "method" if AUFS_HNOTIFY
-+	default AUFS_HFSNOTIFY
-+config AUFS_HFSNOTIFY
-+	bool "fsnotify"
-+	select FSNOTIFY
-+endchoice
-+
-+config AUFS_EXPORT
-+	bool "NFS-exportable aufs"
-+	select EXPORTFS
-+	help
-+	If you want to export your mounted aufs via NFS, then enable this
-+	option. There are several requirements for this configuration.
-+	See detail in aufs.5.
-+
-+config AUFS_INO_T_64
-+	bool
-+	depends on AUFS_EXPORT
-+	depends on 64BIT && !(ALPHA || S390)
-+	default y
-+	help
-+	Automatic configuration for internal use.
-+	/* typedef unsigned long/int __kernel_ino_t */
-+	/* alpha and s390x are int */
-+
-+config AUFS_XATTR
-+	bool "support for XATTR/EA (including Security Labels)"
-+	help
-+	If your branch fs supports XATTR/EA and you want to make them
-+	available in aufs too, then enable this opsion and specify the
-+	branch attributes for EA.
-+	See detail in aufs.5.
-+
-+config AUFS_FHSM
-+	bool "File-based Hierarchical Storage Management"
-+	help
-+	Hierarchical Storage Management (or HSM) is a well-known feature
-+	in the storage world. Aufs provides this feature as file-based.
-+	with multiple branches.
-+	These multiple branches are prioritized, ie. the topmost one
-+	should be the fastest drive and be used heavily.
-+
-+config AUFS_RDU
-+	bool "Readdir in userspace"
-+	help
-+	Aufs has two methods to provide a merged view for a directory,
-+	by a user-space library and by kernel-space natively. The latter
-+	is always enabled but sometimes large and slow.
-+	If you enable this option, install the library in aufs2-util
-+	package, and set some environment variables for your readdir(3),
-+	then the work will be handled in user-space which generally
-+	shows better performance in most cases.
-+	See detail in aufs.5.
-+
-+config AUFS_SHWH
-+	bool "Show whiteouts"
-+	help
-+	If you want to make the whiteouts in aufs visible, then enable
-+	this option and specify 'shwh' mount option. Although it may
-+	sounds like philosophy or something, but in technically it
-+	simply shows the name of whiteout with keeping its behaviour.
-+
-+config AUFS_BR_RAMFS
-+	bool "Ramfs (initramfs/rootfs) as an aufs branch"
-+	help
-+	If you want to use ramfs as an aufs branch fs, then enable this
-+	option. Generally tmpfs is recommended.
-+	Aufs prohibited them to be a branch fs by default, because
-+	initramfs becomes unusable after switch_root or something
-+	generally. If you sets initramfs as an aufs branch and boot your
-+	system by switch_root, you will meet a problem easily since the
-+	files in initramfs may be inaccessible.
-+	Unless you are going to use ramfs as an aufs branch fs without
-+	switch_root or something, leave it N.
-+
-+config AUFS_BR_FUSE
-+	bool "Fuse fs as an aufs branch"
-+	depends on FUSE_FS
-+	select AUFS_POLL
-+	help
-+	If you want to use fuse-based userspace filesystem as an aufs
-+	branch fs, then enable this option.
-+	It implements the internal poll(2) operation which is
-+	implemented by fuse only (curretnly).
-+
-+config AUFS_POLL
-+	bool
-+	help
-+	Automatic configuration for internal use.
-+
-+config AUFS_BR_HFSPLUS
-+	bool "Hfsplus as an aufs branch"
-+	depends on HFSPLUS_FS
-+	default y
-+	help
-+	If you want to use hfsplus fs as an aufs branch fs, then enable
-+	this option. This option introduces a small overhead at
-+	copying-up a file on hfsplus.
-+
-+config AUFS_BDEV_LOOP
-+	bool
-+	depends on BLK_DEV_LOOP
-+	default y
-+	help
-+	Automatic configuration for internal use.
-+	Convert =[ym] into =y.
-+
-+config AUFS_DEBUG
-+	bool "Debug aufs"
-+	help
-+	Enable this to compile aufs internal debug code.
-+	It will have a negative impact to the performance.
-+
-+config AUFS_MAGIC_SYSRQ
-+	bool
-+	depends on AUFS_DEBUG && MAGIC_SYSRQ
-+	default y
-+	help
-+	Automatic configuration for internal use.
-+	When aufs supports Magic SysRq, enabled automatically.
-+endif
-diff -Nur linux-4.1.10.orig/fs/aufs/loop.c linux-4.1.10/fs/aufs/loop.c
---- linux-4.1.10.orig/fs/aufs/loop.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/loop.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,145 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * support for loopback block device as a branch
-+ */
-+
-+#include "aufs.h"
-+
-+/* added into drivers/block/loop.c */
-+static struct file *(*backing_file_func)(struct super_block *sb);
-+
-+/*
-+ * test if two lower dentries have overlapping branches.
-+ */
-+int au_test_loopback_overlap(struct super_block *sb, struct dentry *h_adding)
-+{
-+	struct super_block *h_sb;
-+	struct file *backing_file;
-+
-+	if (unlikely(!backing_file_func)) {
-+		/* don't load "loop" module here */
-+		backing_file_func = symbol_get(loop_backing_file);
-+		if (unlikely(!backing_file_func))
-+			/* "loop" module is not loaded */
-+			return 0;
-+	}
-+
-+	h_sb = h_adding->d_sb;
-+	backing_file = backing_file_func(h_sb);
-+	if (!backing_file)
-+		return 0;
-+
-+	h_adding = backing_file->f_path.dentry;
-+	/*
-+	 * h_adding can be local NFS.
-+	 * in this case aufs cannot detect the loop.
-+	 */
-+	if (unlikely(h_adding->d_sb == sb))
-+		return 1;
-+	return !!au_test_subdir(h_adding, sb->s_root);
-+}
-+
-+/* true if a kernel thread named 'loop[0-9].*' accesses a file */
-+int au_test_loopback_kthread(void)
-+{
-+	int ret;
-+	struct task_struct *tsk = current;
-+	char c, comm[sizeof(tsk->comm)];
-+
-+	ret = 0;
-+	if (tsk->flags & PF_KTHREAD) {
-+		get_task_comm(comm, tsk);
-+		c = comm[4];
-+		ret = ('0' <= c && c <= '9'
-+		       && !strncmp(comm, "loop", 4));
-+	}
-+
-+	return ret;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+#define au_warn_loopback_step	16
-+static int au_warn_loopback_nelem = au_warn_loopback_step;
-+static unsigned long *au_warn_loopback_array;
-+
-+void au_warn_loopback(struct super_block *h_sb)
-+{
-+	int i, new_nelem;
-+	unsigned long *a, magic;
-+	static DEFINE_SPINLOCK(spin);
-+
-+	magic = h_sb->s_magic;
-+	spin_lock(&spin);
-+	a = au_warn_loopback_array;
-+	for (i = 0; i < au_warn_loopback_nelem && *a; i++)
-+		if (a[i] == magic) {
-+			spin_unlock(&spin);
-+			return;
-+		}
-+
-+	/* h_sb is new to us, print it */
-+	if (i < au_warn_loopback_nelem) {
-+		a[i] = magic;
-+		goto pr;
-+	}
-+
-+	/* expand the array */
-+	new_nelem = au_warn_loopback_nelem + au_warn_loopback_step;
-+	a = au_kzrealloc(au_warn_loopback_array,
-+			 au_warn_loopback_nelem * sizeof(unsigned long),
-+			 new_nelem * sizeof(unsigned long), GFP_ATOMIC);
-+	if (a) {
-+		au_warn_loopback_nelem = new_nelem;
-+		au_warn_loopback_array = a;
-+		a[i] = magic;
-+		goto pr;
-+	}
-+
-+	spin_unlock(&spin);
-+	AuWarn1("realloc failed, ignored\n");
-+	return;
-+
-+pr:
-+	spin_unlock(&spin);
-+	pr_warn("you may want to try another patch for loopback file "
-+		"on %s(0x%lx) branch\n", au_sbtype(h_sb), magic);
-+}
-+
-+int au_loopback_init(void)
-+{
-+	int err;
-+	struct super_block *sb __maybe_unused;
-+
-+	AuDebugOn(sizeof(sb->s_magic) != sizeof(unsigned long));
-+
-+	err = 0;
-+	au_warn_loopback_array = kcalloc(au_warn_loopback_step,
-+					 sizeof(unsigned long), GFP_NOFS);
-+	if (unlikely(!au_warn_loopback_array))
-+		err = -ENOMEM;
-+
-+	return err;
-+}
-+
-+void au_loopback_fin(void)
-+{
-+	symbol_put(loop_backing_file);
-+	kfree(au_warn_loopback_array);
-+}
-diff -Nur linux-4.1.10.orig/fs/aufs/loop.h linux-4.1.10/fs/aufs/loop.h
---- linux-4.1.10.orig/fs/aufs/loop.h	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/loop.h	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,52 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * support for loopback mount as a branch
-+ */
-+
-+#ifndef __AUFS_LOOP_H__
-+#define __AUFS_LOOP_H__
-+
-+#ifdef __KERNEL__
-+
-+struct dentry;
-+struct super_block;
-+
-+#ifdef CONFIG_AUFS_BDEV_LOOP
-+/* drivers/block/loop.c */
-+struct file *loop_backing_file(struct super_block *sb);
-+
-+/* loop.c */
-+int au_test_loopback_overlap(struct super_block *sb, struct dentry *h_adding);
-+int au_test_loopback_kthread(void);
-+void au_warn_loopback(struct super_block *h_sb);
-+
-+int au_loopback_init(void);
-+void au_loopback_fin(void);
-+#else
-+AuStubInt0(au_test_loopback_overlap, struct super_block *sb,
-+	   struct dentry *h_adding)
-+AuStubInt0(au_test_loopback_kthread, void)
-+AuStubVoid(au_warn_loopback, struct super_block *h_sb)
-+
-+AuStubInt0(au_loopback_init, void)
-+AuStubVoid(au_loopback_fin, void)
-+#endif /* BLK_DEV_LOOP */
-+
-+#endif /* __KERNEL__ */
-+#endif /* __AUFS_LOOP_H__ */
-diff -Nur linux-4.1.10.orig/fs/aufs/magic.mk linux-4.1.10/fs/aufs/magic.mk
---- linux-4.1.10.orig/fs/aufs/magic.mk	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/magic.mk	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,30 @@
-+
-+# defined in ${srctree}/fs/fuse/inode.c
-+# tristate
-+ifdef CONFIG_FUSE_FS
-+ccflags-y += -DFUSE_SUPER_MAGIC=0x65735546
-+endif
-+
-+# defined in ${srctree}/fs/xfs/xfs_sb.h
-+# tristate
-+ifdef CONFIG_XFS_FS
-+ccflags-y += -DXFS_SB_MAGIC=0x58465342
-+endif
-+
-+# defined in ${srctree}/fs/configfs/mount.c
-+# tristate
-+ifdef CONFIG_CONFIGFS_FS
-+ccflags-y += -DCONFIGFS_MAGIC=0x62656570
-+endif
-+
-+# defined in ${srctree}/fs/ubifs/ubifs.h
-+# tristate
-+ifdef CONFIG_UBIFS_FS
-+ccflags-y += -DUBIFS_SUPER_MAGIC=0x24051905
-+endif
-+
-+# defined in ${srctree}/fs/hfsplus/hfsplus_raw.h
-+# tristate
-+ifdef CONFIG_HFSPLUS_FS
-+ccflags-y += -DHFSPLUS_SUPER_MAGIC=0x482b
-+endif
-diff -Nur linux-4.1.10.orig/fs/aufs/Makefile linux-4.1.10/fs/aufs/Makefile
---- linux-4.1.10.orig/fs/aufs/Makefile	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/Makefile	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,44 @@
-+
-+include ${src}/magic.mk
-+ifeq (${CONFIG_AUFS_FS},m)
-+include ${src}/conf.mk
-+endif
-+-include ${src}/priv_def.mk
-+
-+# cf. include/linux/kernel.h
-+# enable pr_debug
-+ccflags-y += -DDEBUG
-+# sparse requires the full pathname
-+ifdef M
-+ccflags-y += -include ${M}/../../include/uapi/linux/aufs_type.h
-+else
-+ccflags-y += -include ${srctree}/include/uapi/linux/aufs_type.h
-+endif
-+
-+obj-$(CONFIG_AUFS_FS) += aufs.o
-+aufs-y := module.o sbinfo.o super.o branch.o xino.o sysaufs.o opts.o \
-+	wkq.o vfsub.o dcsub.o \
-+	cpup.o whout.o wbr_policy.o \
-+	dinfo.o dentry.o \
-+	dynop.o \
-+	finfo.o file.o f_op.o \
-+	dir.o vdir.o \
-+	iinfo.o inode.o i_op.o i_op_add.o i_op_del.o i_op_ren.o \
-+	mvdown.o ioctl.o
-+
-+# all are boolean
-+aufs-$(CONFIG_PROC_FS) += procfs.o plink.o
-+aufs-$(CONFIG_SYSFS) += sysfs.o
-+aufs-$(CONFIG_DEBUG_FS) += dbgaufs.o
-+aufs-$(CONFIG_AUFS_BDEV_LOOP) += loop.o
-+aufs-$(CONFIG_AUFS_HNOTIFY) += hnotify.o
-+aufs-$(CONFIG_AUFS_HFSNOTIFY) += hfsnotify.o
-+aufs-$(CONFIG_AUFS_EXPORT) += export.o
-+aufs-$(CONFIG_AUFS_XATTR) += xattr.o
-+aufs-$(CONFIG_FS_POSIX_ACL) += posix_acl.o
-+aufs-$(CONFIG_AUFS_FHSM) += fhsm.o
-+aufs-$(CONFIG_AUFS_POLL) += poll.o
-+aufs-$(CONFIG_AUFS_RDU) += rdu.o
-+aufs-$(CONFIG_AUFS_BR_HFSPLUS) += hfsplus.o
-+aufs-$(CONFIG_AUFS_DEBUG) += debug.o
-+aufs-$(CONFIG_AUFS_MAGIC_SYSRQ) += sysrq.o
-diff -Nur linux-4.1.10.orig/fs/aufs/module.c linux-4.1.10/fs/aufs/module.c
---- linux-4.1.10.orig/fs/aufs/module.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/module.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,218 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * module global variables and operations
-+ */
-+
-+#include <linux/module.h>
-+#include <linux/seq_file.h>
-+#include "aufs.h"
-+
-+void *au_kzrealloc(void *p, unsigned int nused, unsigned int new_sz, gfp_t gfp)
-+{
-+	if (new_sz <= nused)
-+		return p;
-+
-+	p = krealloc(p, new_sz, gfp);
-+	if (p)
-+		memset(p + nused, 0, new_sz - nused);
-+	return p;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/*
-+ * aufs caches
-+ */
-+struct kmem_cache *au_cachep[AuCache_Last];
-+static int __init au_cache_init(void)
-+{
-+	au_cachep[AuCache_DINFO] = AuCacheCtor(au_dinfo, au_di_init_once);
-+	if (au_cachep[AuCache_DINFO])
-+		/* SLAB_DESTROY_BY_RCU */
-+		au_cachep[AuCache_ICNTNR] = AuCacheCtor(au_icntnr,
-+							au_icntnr_init_once);
-+	if (au_cachep[AuCache_ICNTNR])
-+		au_cachep[AuCache_FINFO] = AuCacheCtor(au_finfo,
-+						       au_fi_init_once);
-+	if (au_cachep[AuCache_FINFO])
-+		au_cachep[AuCache_VDIR] = AuCache(au_vdir);
-+	if (au_cachep[AuCache_VDIR])
-+		au_cachep[AuCache_DEHSTR] = AuCache(au_vdir_dehstr);
-+	if (au_cachep[AuCache_DEHSTR])
-+		return 0;
-+
-+	return -ENOMEM;
-+}
-+
-+static void au_cache_fin(void)
-+{
-+	int i;
-+
-+	/*
-+	 * Make sure all delayed rcu free inodes are flushed before we
-+	 * destroy cache.
-+	 */
-+	rcu_barrier();
-+
-+	/* excluding AuCache_HNOTIFY */
-+	BUILD_BUG_ON(AuCache_HNOTIFY + 1 != AuCache_Last);
-+	for (i = 0; i < AuCache_HNOTIFY; i++)
-+		if (au_cachep[i]) {
-+			kmem_cache_destroy(au_cachep[i]);
-+			au_cachep[i] = NULL;
-+		}
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+int au_dir_roflags;
-+
-+#ifdef CONFIG_AUFS_SBILIST
-+/*
-+ * iterate_supers_type() doesn't protect us from
-+ * remounting (branch management)
-+ */
-+struct au_splhead au_sbilist;
-+#endif
-+
-+struct lock_class_key au_lc_key[AuLcKey_Last];
-+
-+/*
-+ * functions for module interface.
-+ */
-+MODULE_LICENSE("GPL");
-+/* MODULE_LICENSE("GPL v2"); */
-+MODULE_AUTHOR("Junjiro R. Okajima <aufs-users@lists.sourceforge.net>");
-+MODULE_DESCRIPTION(AUFS_NAME
-+	" -- Advanced multi layered unification filesystem");
-+MODULE_VERSION(AUFS_VERSION);
-+MODULE_ALIAS_FS(AUFS_NAME);
-+
-+/* this module parameter has no meaning when SYSFS is disabled */
-+int sysaufs_brs = 1;
-+MODULE_PARM_DESC(brs, "use <sysfs>/fs/aufs/si_*/brN");
-+module_param_named(brs, sysaufs_brs, int, S_IRUGO);
-+
-+/* this module parameter has no meaning when USER_NS is disabled */
-+static bool au_userns;
-+MODULE_PARM_DESC(allow_userns, "allow unprivileged to mount under userns");
-+module_param_named(allow_userns, au_userns, bool, S_IRUGO);
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static char au_esc_chars[0x20 + 3]; /* 0x01-0x20, backslash, del, and NULL */
-+
-+int au_seq_path(struct seq_file *seq, struct path *path)
-+{
-+	int err;
-+
-+	err = seq_path(seq, path, au_esc_chars);
-+	if (err > 0)
-+		err = 0;
-+	else if (err < 0)
-+		err = -ENOMEM;
-+
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static int __init aufs_init(void)
-+{
-+	int err, i;
-+	char *p;
-+
-+	p = au_esc_chars;
-+	for (i = 1; i <= ' '; i++)
-+		*p++ = i;
-+	*p++ = '\\';
-+	*p++ = '\x7f';
-+	*p = 0;
-+
-+	au_dir_roflags = au_file_roflags(O_DIRECTORY | O_LARGEFILE);
-+
-+	au_sbilist_init();
-+	sysaufs_brs_init();
-+	au_debug_init();
-+	au_dy_init();
-+	err = sysaufs_init();
-+	if (unlikely(err))
-+		goto out;
-+	err = au_procfs_init();
-+	if (unlikely(err))
-+		goto out_sysaufs;
-+	err = au_wkq_init();
-+	if (unlikely(err))
-+		goto out_procfs;
-+	err = au_loopback_init();
-+	if (unlikely(err))
-+		goto out_wkq;
-+	err = au_hnotify_init();
-+	if (unlikely(err))
-+		goto out_loopback;
-+	err = au_sysrq_init();
-+	if (unlikely(err))
-+		goto out_hin;
-+	err = au_cache_init();
-+	if (unlikely(err))
-+		goto out_sysrq;
-+
-+	aufs_fs_type.fs_flags |= au_userns ? FS_USERNS_MOUNT : 0;
-+	err = register_filesystem(&aufs_fs_type);
-+	if (unlikely(err))
-+		goto out_cache;
-+
-+	/* since we define pr_fmt, call printk directly */
-+	printk(KERN_INFO AUFS_NAME " " AUFS_VERSION "\n");
-+	goto out; /* success */
-+
-+out_cache:
-+	au_cache_fin();
-+out_sysrq:
-+	au_sysrq_fin();
-+out_hin:
-+	au_hnotify_fin();
-+out_loopback:
-+	au_loopback_fin();
-+out_wkq:
-+	au_wkq_fin();
-+out_procfs:
-+	au_procfs_fin();
-+out_sysaufs:
-+	sysaufs_fin();
-+	au_dy_fin();
-+out:
-+	return err;
-+}
-+
-+static void __exit aufs_exit(void)
-+{
-+	unregister_filesystem(&aufs_fs_type);
-+	au_cache_fin();
-+	au_sysrq_fin();
-+	au_hnotify_fin();
-+	au_loopback_fin();
-+	au_wkq_fin();
-+	au_procfs_fin();
-+	sysaufs_fin();
-+	au_dy_fin();
-+}
-+
-+module_init(aufs_init);
-+module_exit(aufs_exit);
-diff -Nur linux-4.1.10.orig/fs/aufs/module.h linux-4.1.10/fs/aufs/module.h
---- linux-4.1.10.orig/fs/aufs/module.h	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/module.h	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,104 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * module initialization and module-global
-+ */
-+
-+#ifndef __AUFS_MODULE_H__
-+#define __AUFS_MODULE_H__
-+
-+#ifdef __KERNEL__
-+
-+#include <linux/slab.h>
-+
-+struct path;
-+struct seq_file;
-+
-+/* module parameters */
-+extern int sysaufs_brs;
-+
-+/* ---------------------------------------------------------------------- */
-+
-+extern int au_dir_roflags;
-+
-+enum {
-+	AuLcNonDir_FIINFO,
-+	AuLcNonDir_DIINFO,
-+	AuLcNonDir_IIINFO,
-+
-+	AuLcDir_FIINFO,
-+	AuLcDir_DIINFO,
-+	AuLcDir_IIINFO,
-+
-+	AuLcSymlink_DIINFO,
-+	AuLcSymlink_IIINFO,
-+
-+	AuLcKey_Last
-+};
-+extern struct lock_class_key au_lc_key[AuLcKey_Last];
-+
-+void *au_kzrealloc(void *p, unsigned int nused, unsigned int new_sz, gfp_t gfp);
-+int au_seq_path(struct seq_file *seq, struct path *path);
-+
-+#ifdef CONFIG_PROC_FS
-+/* procfs.c */
-+int __init au_procfs_init(void);
-+void au_procfs_fin(void);
-+#else
-+AuStubInt0(au_procfs_init, void);
-+AuStubVoid(au_procfs_fin, void);
-+#endif
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* kmem cache */
-+enum {
-+	AuCache_DINFO,
-+	AuCache_ICNTNR,
-+	AuCache_FINFO,
-+	AuCache_VDIR,
-+	AuCache_DEHSTR,
-+	AuCache_HNOTIFY, /* must be last */
-+	AuCache_Last
-+};
-+
-+#define AuCacheFlags		(SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD)
-+#define AuCache(type)		KMEM_CACHE(type, AuCacheFlags)
-+#define AuCacheCtor(type, ctor)	\
-+	kmem_cache_create(#type, sizeof(struct type), \
-+			  __alignof__(struct type), AuCacheFlags, ctor)
-+
-+extern struct kmem_cache *au_cachep[];
-+
-+#define AuCacheFuncs(name, index) \
-+static inline struct au_##name *au_cache_alloc_##name(void) \
-+{ return kmem_cache_alloc(au_cachep[AuCache_##index], GFP_NOFS); } \
-+static inline void au_cache_free_##name(struct au_##name *p) \
-+{ kmem_cache_free(au_cachep[AuCache_##index], p); }
-+
-+AuCacheFuncs(dinfo, DINFO);
-+AuCacheFuncs(icntnr, ICNTNR);
-+AuCacheFuncs(finfo, FINFO);
-+AuCacheFuncs(vdir, VDIR);
-+AuCacheFuncs(vdir_dehstr, DEHSTR);
-+#ifdef CONFIG_AUFS_HNOTIFY
-+AuCacheFuncs(hnotify, HNOTIFY);
-+#endif
-+
-+#endif /* __KERNEL__ */
-+#endif /* __AUFS_MODULE_H__ */
-diff -Nur linux-4.1.10.orig/fs/aufs/mvdown.c linux-4.1.10/fs/aufs/mvdown.c
---- linux-4.1.10.orig/fs/aufs/mvdown.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/mvdown.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,694 @@
-+/*
-+ * Copyright (C) 2011-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * move-down, opposite of copy-up
-+ */
-+
-+#include "aufs.h"
-+
-+struct au_mvd_args {
-+	struct {
-+		struct super_block *h_sb;
-+		struct dentry *h_parent;
-+		struct au_hinode *hdir;
-+		struct inode *h_dir, *h_inode;
-+		struct au_pin pin;
-+	} info[AUFS_MVDOWN_NARRAY];
-+
-+	struct aufs_mvdown mvdown;
-+	struct dentry *dentry, *parent;
-+	struct inode *inode, *dir;
-+	struct super_block *sb;
-+	aufs_bindex_t bopq, bwh, bfound;
-+	unsigned char rename_lock;
-+};
-+
-+#define mvd_errno		mvdown.au_errno
-+#define mvd_bsrc		mvdown.stbr[AUFS_MVDOWN_UPPER].bindex
-+#define mvd_src_brid		mvdown.stbr[AUFS_MVDOWN_UPPER].brid
-+#define mvd_bdst		mvdown.stbr[AUFS_MVDOWN_LOWER].bindex
-+#define mvd_dst_brid		mvdown.stbr[AUFS_MVDOWN_LOWER].brid
-+
-+#define mvd_h_src_sb		info[AUFS_MVDOWN_UPPER].h_sb
-+#define mvd_h_src_parent	info[AUFS_MVDOWN_UPPER].h_parent
-+#define mvd_hdir_src		info[AUFS_MVDOWN_UPPER].hdir
-+#define mvd_h_src_dir		info[AUFS_MVDOWN_UPPER].h_dir
-+#define mvd_h_src_inode		info[AUFS_MVDOWN_UPPER].h_inode
-+#define mvd_pin_src		info[AUFS_MVDOWN_UPPER].pin
-+
-+#define mvd_h_dst_sb		info[AUFS_MVDOWN_LOWER].h_sb
-+#define mvd_h_dst_parent	info[AUFS_MVDOWN_LOWER].h_parent
-+#define mvd_hdir_dst		info[AUFS_MVDOWN_LOWER].hdir
-+#define mvd_h_dst_dir		info[AUFS_MVDOWN_LOWER].h_dir
-+#define mvd_h_dst_inode		info[AUFS_MVDOWN_LOWER].h_inode
-+#define mvd_pin_dst		info[AUFS_MVDOWN_LOWER].pin
-+
-+#define AU_MVD_PR(flag, ...) do {			\
-+		if (flag)				\
-+			pr_err(__VA_ARGS__);		\
-+	} while (0)
-+
-+static int find_lower_writable(struct au_mvd_args *a)
-+{
-+	struct super_block *sb;
-+	aufs_bindex_t bindex, bend;
-+	struct au_branch *br;
-+
-+	sb = a->sb;
-+	bindex = a->mvd_bsrc;
-+	bend = au_sbend(sb);
-+	if (a->mvdown.flags & AUFS_MVDOWN_FHSM_LOWER)
-+		for (bindex++; bindex <= bend; bindex++) {
-+			br = au_sbr(sb, bindex);
-+			if (au_br_fhsm(br->br_perm)
-+			    && (!(au_br_sb(br)->s_flags & MS_RDONLY)))
-+				return bindex;
-+		}
-+	else if (!(a->mvdown.flags & AUFS_MVDOWN_ROLOWER))
-+		for (bindex++; bindex <= bend; bindex++) {
-+			br = au_sbr(sb, bindex);
-+			if (!au_br_rdonly(br))
-+				return bindex;
-+		}
-+	else
-+		for (bindex++; bindex <= bend; bindex++) {
-+			br = au_sbr(sb, bindex);
-+			if (!(au_br_sb(br)->s_flags & MS_RDONLY)) {
-+				if (au_br_rdonly(br))
-+					a->mvdown.flags
-+						|= AUFS_MVDOWN_ROLOWER_R;
-+				return bindex;
-+			}
-+		}
-+
-+	return -1;
-+}
-+
-+/* make the parent dir on bdst */
-+static int au_do_mkdir(const unsigned char dmsg, struct au_mvd_args *a)
-+{
-+	int err;
-+
-+	err = 0;
-+	a->mvd_hdir_src = au_hi(a->dir, a->mvd_bsrc);
-+	a->mvd_hdir_dst = au_hi(a->dir, a->mvd_bdst);
-+	a->mvd_h_src_parent = au_h_dptr(a->parent, a->mvd_bsrc);
-+	a->mvd_h_dst_parent = NULL;
-+	if (au_dbend(a->parent) >= a->mvd_bdst)
-+		a->mvd_h_dst_parent = au_h_dptr(a->parent, a->mvd_bdst);
-+	if (!a->mvd_h_dst_parent) {
-+		err = au_cpdown_dirs(a->dentry, a->mvd_bdst);
-+		if (unlikely(err)) {
-+			AU_MVD_PR(dmsg, "cpdown_dirs failed\n");
-+			goto out;
-+		}
-+		a->mvd_h_dst_parent = au_h_dptr(a->parent, a->mvd_bdst);
-+	}
-+
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+/* lock them all */
-+static int au_do_lock(const unsigned char dmsg, struct au_mvd_args *a)
-+{
-+	int err;
-+	struct dentry *h_trap;
-+
-+	a->mvd_h_src_sb = au_sbr_sb(a->sb, a->mvd_bsrc);
-+	a->mvd_h_dst_sb = au_sbr_sb(a->sb, a->mvd_bdst);
-+	err = au_pin(&a->mvd_pin_dst, a->dentry, a->mvd_bdst,
-+		     au_opt_udba(a->sb),
-+		     AuPin_MNT_WRITE | AuPin_DI_LOCKED);
-+	AuTraceErr(err);
-+	if (unlikely(err)) {
-+		AU_MVD_PR(dmsg, "pin_dst failed\n");
-+		goto out;
-+	}
-+
-+	if (a->mvd_h_src_sb != a->mvd_h_dst_sb) {
-+		a->rename_lock = 0;
-+		au_pin_init(&a->mvd_pin_src, a->dentry, a->mvd_bsrc,
-+			    AuLsc_DI_PARENT, AuLsc_I_PARENT3,
-+			    au_opt_udba(a->sb),
-+			    AuPin_MNT_WRITE | AuPin_DI_LOCKED);
-+		err = au_do_pin(&a->mvd_pin_src);
-+		AuTraceErr(err);
-+		a->mvd_h_src_dir = d_inode(a->mvd_h_src_parent);
-+		if (unlikely(err)) {
-+			AU_MVD_PR(dmsg, "pin_src failed\n");
-+			goto out_dst;
-+		}
-+		goto out; /* success */
-+	}
-+
-+	a->rename_lock = 1;
-+	au_pin_hdir_unlock(&a->mvd_pin_dst);
-+	err = au_pin(&a->mvd_pin_src, a->dentry, a->mvd_bsrc,
-+		     au_opt_udba(a->sb),
-+		     AuPin_MNT_WRITE | AuPin_DI_LOCKED);
-+	AuTraceErr(err);
-+	a->mvd_h_src_dir = d_inode(a->mvd_h_src_parent);
-+	if (unlikely(err)) {
-+		AU_MVD_PR(dmsg, "pin_src failed\n");
-+		au_pin_hdir_lock(&a->mvd_pin_dst);
-+		goto out_dst;
-+	}
-+	au_pin_hdir_unlock(&a->mvd_pin_src);
-+	h_trap = vfsub_lock_rename(a->mvd_h_src_parent, a->mvd_hdir_src,
-+				   a->mvd_h_dst_parent, a->mvd_hdir_dst);
-+	if (h_trap) {
-+		err = (h_trap != a->mvd_h_src_parent);
-+		if (err)
-+			err = (h_trap != a->mvd_h_dst_parent);
-+	}
-+	BUG_ON(err); /* it should never happen */
-+	if (unlikely(a->mvd_h_src_dir != au_pinned_h_dir(&a->mvd_pin_src))) {
-+		err = -EBUSY;
-+		AuTraceErr(err);
-+		vfsub_unlock_rename(a->mvd_h_src_parent, a->mvd_hdir_src,
-+				    a->mvd_h_dst_parent, a->mvd_hdir_dst);
-+		au_pin_hdir_lock(&a->mvd_pin_src);
-+		au_unpin(&a->mvd_pin_src);
-+		au_pin_hdir_lock(&a->mvd_pin_dst);
-+		goto out_dst;
-+	}
-+	goto out; /* success */
-+
-+out_dst:
-+	au_unpin(&a->mvd_pin_dst);
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+static void au_do_unlock(const unsigned char dmsg, struct au_mvd_args *a)
-+{
-+	if (!a->rename_lock)
-+		au_unpin(&a->mvd_pin_src);
-+	else {
-+		vfsub_unlock_rename(a->mvd_h_src_parent, a->mvd_hdir_src,
-+				    a->mvd_h_dst_parent, a->mvd_hdir_dst);
-+		au_pin_hdir_lock(&a->mvd_pin_src);
-+		au_unpin(&a->mvd_pin_src);
-+		au_pin_hdir_lock(&a->mvd_pin_dst);
-+	}
-+	au_unpin(&a->mvd_pin_dst);
-+}
-+
-+/* copy-down the file */
-+static int au_do_cpdown(const unsigned char dmsg, struct au_mvd_args *a)
-+{
-+	int err;
-+	struct au_cp_generic cpg = {
-+		.dentry	= a->dentry,
-+		.bdst	= a->mvd_bdst,
-+		.bsrc	= a->mvd_bsrc,
-+		.len	= -1,
-+		.pin	= &a->mvd_pin_dst,
-+		.flags	= AuCpup_DTIME | AuCpup_HOPEN
-+	};
-+
-+	AuDbg("b%d, b%d\n", cpg.bsrc, cpg.bdst);
-+	if (a->mvdown.flags & AUFS_MVDOWN_OWLOWER)
-+		au_fset_cpup(cpg.flags, OVERWRITE);
-+	if (a->mvdown.flags & AUFS_MVDOWN_ROLOWER)
-+		au_fset_cpup(cpg.flags, RWDST);
-+	err = au_sio_cpdown_simple(&cpg);
-+	if (unlikely(err))
-+		AU_MVD_PR(dmsg, "cpdown failed\n");
-+
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+/*
-+ * unlink the whiteout on bdst if exist which may be created by UDBA while we
-+ * were sleeping
-+ */
-+static int au_do_unlink_wh(const unsigned char dmsg, struct au_mvd_args *a)
-+{
-+	int err;
-+	struct path h_path;
-+	struct au_branch *br;
-+	struct inode *delegated;
-+
-+	br = au_sbr(a->sb, a->mvd_bdst);
-+	h_path.dentry = au_wh_lkup(a->mvd_h_dst_parent, &a->dentry->d_name, br);
-+	err = PTR_ERR(h_path.dentry);
-+	if (IS_ERR(h_path.dentry)) {
-+		AU_MVD_PR(dmsg, "wh_lkup failed\n");
-+		goto out;
-+	}
-+
-+	err = 0;
-+	if (d_is_positive(h_path.dentry)) {
-+		h_path.mnt = au_br_mnt(br);
-+		delegated = NULL;
-+		err = vfsub_unlink(d_inode(a->mvd_h_dst_parent), &h_path,
-+				   &delegated, /*force*/0);
-+		if (unlikely(err == -EWOULDBLOCK)) {
-+			pr_warn("cannot retry for NFSv4 delegation"
-+				" for an internal unlink\n");
-+			iput(delegated);
-+		}
-+		if (unlikely(err))
-+			AU_MVD_PR(dmsg, "wh_unlink failed\n");
-+	}
-+	dput(h_path.dentry);
-+
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+/*
-+ * unlink the topmost h_dentry
-+ */
-+static int au_do_unlink(const unsigned char dmsg, struct au_mvd_args *a)
-+{
-+	int err;
-+	struct path h_path;
-+	struct inode *delegated;
-+
-+	h_path.mnt = au_sbr_mnt(a->sb, a->mvd_bsrc);
-+	h_path.dentry = au_h_dptr(a->dentry, a->mvd_bsrc);
-+	delegated = NULL;
-+	err = vfsub_unlink(a->mvd_h_src_dir, &h_path, &delegated, /*force*/0);
-+	if (unlikely(err == -EWOULDBLOCK)) {
-+		pr_warn("cannot retry for NFSv4 delegation"
-+			" for an internal unlink\n");
-+		iput(delegated);
-+	}
-+	if (unlikely(err))
-+		AU_MVD_PR(dmsg, "unlink failed\n");
-+
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+/* Since mvdown succeeded, we ignore an error of this function */
-+static void au_do_stfs(const unsigned char dmsg, struct au_mvd_args *a)
-+{
-+	int err;
-+	struct au_branch *br;
-+
-+	a->mvdown.flags |= AUFS_MVDOWN_STFS_FAILED;
-+	br = au_sbr(a->sb, a->mvd_bsrc);
-+	err = au_br_stfs(br, &a->mvdown.stbr[AUFS_MVDOWN_UPPER].stfs);
-+	if (!err) {
-+		br = au_sbr(a->sb, a->mvd_bdst);
-+		a->mvdown.stbr[AUFS_MVDOWN_LOWER].brid = br->br_id;
-+		err = au_br_stfs(br, &a->mvdown.stbr[AUFS_MVDOWN_LOWER].stfs);
-+	}
-+	if (!err)
-+		a->mvdown.flags &= ~AUFS_MVDOWN_STFS_FAILED;
-+	else
-+		AU_MVD_PR(dmsg, "statfs failed (%d), ignored\n", err);
-+}
-+
-+/*
-+ * copy-down the file and unlink the bsrc file.
-+ * - unlink the bdst whout if exist
-+ * - copy-down the file (with whtmp name and rename)
-+ * - unlink the bsrc file
-+ */
-+static int au_do_mvdown(const unsigned char dmsg, struct au_mvd_args *a)
-+{
-+	int err;
-+
-+	err = au_do_mkdir(dmsg, a);
-+	if (!err)
-+		err = au_do_lock(dmsg, a);
-+	if (unlikely(err))
-+		goto out;
-+
-+	/*
-+	 * do not revert the activities we made on bdst since they should be
-+	 * harmless in aufs.
-+	 */
-+
-+	err = au_do_cpdown(dmsg, a);
-+	if (!err)
-+		err = au_do_unlink_wh(dmsg, a);
-+	if (!err && !(a->mvdown.flags & AUFS_MVDOWN_KUPPER))
-+		err = au_do_unlink(dmsg, a);
-+	if (unlikely(err))
-+		goto out_unlock;
-+
-+	AuDbg("%pd2, 0x%x, %d --> %d\n",
-+	      a->dentry, a->mvdown.flags, a->mvd_bsrc, a->mvd_bdst);
-+	if (find_lower_writable(a) < 0)
-+		a->mvdown.flags |= AUFS_MVDOWN_BOTTOM;
-+
-+	if (a->mvdown.flags & AUFS_MVDOWN_STFS)
-+		au_do_stfs(dmsg, a);
-+
-+	/* maintain internal array */
-+	if (!(a->mvdown.flags & AUFS_MVDOWN_KUPPER)) {
-+		au_set_h_dptr(a->dentry, a->mvd_bsrc, NULL);
-+		au_set_dbstart(a->dentry, a->mvd_bdst);
-+		au_set_h_iptr(a->inode, a->mvd_bsrc, NULL, /*flags*/0);
-+		au_set_ibstart(a->inode, a->mvd_bdst);
-+	}
-+	if (au_dbend(a->dentry) < a->mvd_bdst)
-+		au_set_dbend(a->dentry, a->mvd_bdst);
-+	if (au_ibend(a->inode) < a->mvd_bdst)
-+		au_set_ibend(a->inode, a->mvd_bdst);
-+
-+out_unlock:
-+	au_do_unlock(dmsg, a);
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* make sure the file is idle */
-+static int au_mvd_args_busy(const unsigned char dmsg, struct au_mvd_args *a)
-+{
-+	int err, plinked;
-+
-+	err = 0;
-+	plinked = !!au_opt_test(au_mntflags(a->sb), PLINK);
-+	if (au_dbstart(a->dentry) == a->mvd_bsrc
-+	    && au_dcount(a->dentry) == 1
-+	    && atomic_read(&a->inode->i_count) == 1
-+	    /* && a->mvd_h_src_inode->i_nlink == 1 */
-+	    && (!plinked || !au_plink_test(a->inode))
-+	    && a->inode->i_nlink == 1)
-+		goto out;
-+
-+	err = -EBUSY;
-+	AU_MVD_PR(dmsg,
-+		  "b%d, d{b%d, c%d?}, i{c%d?, l%u}, hi{l%u}, p{%d, %d}\n",
-+		  a->mvd_bsrc, au_dbstart(a->dentry), au_dcount(a->dentry),
-+		  atomic_read(&a->inode->i_count), a->inode->i_nlink,
-+		  a->mvd_h_src_inode->i_nlink,
-+		  plinked, plinked ? au_plink_test(a->inode) : 0);
-+
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+/* make sure the parent dir is fine */
-+static int au_mvd_args_parent(const unsigned char dmsg,
-+			      struct au_mvd_args *a)
-+{
-+	int err;
-+	aufs_bindex_t bindex;
-+
-+	err = 0;
-+	if (unlikely(au_alive_dir(a->parent))) {
-+		err = -ENOENT;
-+		AU_MVD_PR(dmsg, "parent dir is dead\n");
-+		goto out;
-+	}
-+
-+	a->bopq = au_dbdiropq(a->parent);
-+	bindex = au_wbr_nonopq(a->dentry, a->mvd_bdst);
-+	AuDbg("b%d\n", bindex);
-+	if (unlikely((bindex >= 0 && bindex < a->mvd_bdst)
-+		     || (a->bopq != -1 && a->bopq < a->mvd_bdst))) {
-+		err = -EINVAL;
-+		a->mvd_errno = EAU_MVDOWN_OPAQUE;
-+		AU_MVD_PR(dmsg, "ancestor is opaque b%d, b%d\n",
-+			  a->bopq, a->mvd_bdst);
-+	}
-+
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+static int au_mvd_args_intermediate(const unsigned char dmsg,
-+				    struct au_mvd_args *a)
-+{
-+	int err;
-+	struct au_dinfo *dinfo, *tmp;
-+
-+	/* lookup the next lower positive entry */
-+	err = -ENOMEM;
-+	tmp = au_di_alloc(a->sb, AuLsc_DI_TMP);
-+	if (unlikely(!tmp))
-+		goto out;
-+
-+	a->bfound = -1;
-+	a->bwh = -1;
-+	dinfo = au_di(a->dentry);
-+	au_di_cp(tmp, dinfo);
-+	au_di_swap(tmp, dinfo);
-+
-+	/* returns the number of positive dentries */
-+	err = au_lkup_dentry(a->dentry, a->mvd_bsrc + 1, /*type*/0);
-+	if (!err)
-+		a->bwh = au_dbwh(a->dentry);
-+	else if (err > 0)
-+		a->bfound = au_dbstart(a->dentry);
-+
-+	au_di_swap(tmp, dinfo);
-+	au_rw_write_unlock(&tmp->di_rwsem);
-+	au_di_free(tmp);
-+	if (unlikely(err < 0))
-+		AU_MVD_PR(dmsg, "failed look-up lower\n");
-+
-+	/*
-+	 * here, we have these cases.
-+	 * bfound == -1
-+	 *	no positive dentry under bsrc. there are more sub-cases.
-+	 *	bwh < 0
-+	 *		there no whiteout, we can safely move-down.
-+	 *	bwh <= bsrc
-+	 *		impossible
-+	 *	bsrc < bwh && bwh < bdst
-+	 *		there is a whiteout on RO branch. cannot proceed.
-+	 *	bwh == bdst
-+	 *		there is a whiteout on the RW target branch. it should
-+	 *		be removed.
-+	 *	bdst < bwh
-+	 *		there is a whiteout somewhere unrelated branch.
-+	 * -1 < bfound && bfound <= bsrc
-+	 *	impossible.
-+	 * bfound < bdst
-+	 *	found, but it is on RO branch between bsrc and bdst. cannot
-+	 *	proceed.
-+	 * bfound == bdst
-+	 *	found, replace it if AUFS_MVDOWN_FORCE is set. otherwise return
-+	 *	error.
-+	 * bdst < bfound
-+	 *	found, after we create the file on bdst, it will be hidden.
-+	 */
-+
-+	AuDebugOn(a->bfound == -1
-+		  && a->bwh != -1
-+		  && a->bwh <= a->mvd_bsrc);
-+	AuDebugOn(-1 < a->bfound
-+		  && a->bfound <= a->mvd_bsrc);
-+
-+	err = -EINVAL;
-+	if (a->bfound == -1
-+	    && a->mvd_bsrc < a->bwh
-+	    && a->bwh != -1
-+	    && a->bwh < a->mvd_bdst) {
-+		a->mvd_errno = EAU_MVDOWN_WHITEOUT;
-+		AU_MVD_PR(dmsg, "bsrc %d, bdst %d, bfound %d, bwh %d\n",
-+			  a->mvd_bsrc, a->mvd_bdst, a->bfound, a->bwh);
-+		goto out;
-+	} else if (a->bfound != -1 && a->bfound < a->mvd_bdst) {
-+		a->mvd_errno = EAU_MVDOWN_UPPER;
-+		AU_MVD_PR(dmsg, "bdst %d, bfound %d\n",
-+			  a->mvd_bdst, a->bfound);
-+		goto out;
-+	}
-+
-+	err = 0; /* success */
-+
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+static int au_mvd_args_exist(const unsigned char dmsg, struct au_mvd_args *a)
-+{
-+	int err;
-+
-+	err = 0;
-+	if (!(a->mvdown.flags & AUFS_MVDOWN_OWLOWER)
-+	    && a->bfound == a->mvd_bdst)
-+		err = -EEXIST;
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+static int au_mvd_args(const unsigned char dmsg, struct au_mvd_args *a)
-+{
-+	int err;
-+	struct au_branch *br;
-+
-+	err = -EISDIR;
-+	if (unlikely(S_ISDIR(a->inode->i_mode)))
-+		goto out;
-+
-+	err = -EINVAL;
-+	if (!(a->mvdown.flags & AUFS_MVDOWN_BRID_UPPER))
-+		a->mvd_bsrc = au_ibstart(a->inode);
-+	else {
-+		a->mvd_bsrc = au_br_index(a->sb, a->mvd_src_brid);
-+		if (unlikely(a->mvd_bsrc < 0
-+			     || (a->mvd_bsrc < au_dbstart(a->dentry)
-+				 || au_dbend(a->dentry) < a->mvd_bsrc
-+				 || !au_h_dptr(a->dentry, a->mvd_bsrc))
-+			     || (a->mvd_bsrc < au_ibstart(a->inode)
-+				 || au_ibend(a->inode) < a->mvd_bsrc
-+				 || !au_h_iptr(a->inode, a->mvd_bsrc)))) {
-+			a->mvd_errno = EAU_MVDOWN_NOUPPER;
-+			AU_MVD_PR(dmsg, "no upper\n");
-+			goto out;
-+		}
-+	}
-+	if (unlikely(a->mvd_bsrc == au_sbend(a->sb))) {
-+		a->mvd_errno = EAU_MVDOWN_BOTTOM;
-+		AU_MVD_PR(dmsg, "on the bottom\n");
-+		goto out;
-+	}
-+	a->mvd_h_src_inode = au_h_iptr(a->inode, a->mvd_bsrc);
-+	br = au_sbr(a->sb, a->mvd_bsrc);
-+	err = au_br_rdonly(br);
-+	if (!(a->mvdown.flags & AUFS_MVDOWN_ROUPPER)) {
-+		if (unlikely(err))
-+			goto out;
-+	} else if (!(vfsub_native_ro(a->mvd_h_src_inode)
-+		     || IS_APPEND(a->mvd_h_src_inode))) {
-+		if (err)
-+			a->mvdown.flags |= AUFS_MVDOWN_ROUPPER_R;
-+		/* go on */
-+	} else
-+		goto out;
-+
-+	err = -EINVAL;
-+	if (!(a->mvdown.flags & AUFS_MVDOWN_BRID_LOWER)) {
-+		a->mvd_bdst = find_lower_writable(a);
-+		if (unlikely(a->mvd_bdst < 0)) {
-+			a->mvd_errno = EAU_MVDOWN_BOTTOM;
-+			AU_MVD_PR(dmsg, "no writable lower branch\n");
-+			goto out;
-+		}
-+	} else {
-+		a->mvd_bdst = au_br_index(a->sb, a->mvd_dst_brid);
-+		if (unlikely(a->mvd_bdst < 0
-+			     || au_sbend(a->sb) < a->mvd_bdst)) {
-+			a->mvd_errno = EAU_MVDOWN_NOLOWERBR;
-+			AU_MVD_PR(dmsg, "no lower brid\n");
-+			goto out;
-+		}
-+	}
-+
-+	err = au_mvd_args_busy(dmsg, a);
-+	if (!err)
-+		err = au_mvd_args_parent(dmsg, a);
-+	if (!err)
-+		err = au_mvd_args_intermediate(dmsg, a);
-+	if (!err)
-+		err = au_mvd_args_exist(dmsg, a);
-+	if (!err)
-+		AuDbg("b%d, b%d\n", a->mvd_bsrc, a->mvd_bdst);
-+
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+int au_mvdown(struct dentry *dentry, struct aufs_mvdown __user *uarg)
-+{
-+	int err, e;
-+	unsigned char dmsg;
-+	struct au_mvd_args *args;
-+
-+	err = -EPERM;
-+	if (unlikely(!capable(CAP_SYS_ADMIN)))
-+		goto out;
-+
-+	err = -ENOMEM;
-+	args = kmalloc(sizeof(*args), GFP_NOFS);
-+	if (unlikely(!args))
-+		goto out;
-+
-+	err = copy_from_user(&args->mvdown, uarg, sizeof(args->mvdown));
-+	if (!err)
-+		err = !access_ok(VERIFY_WRITE, uarg, sizeof(*uarg));
-+	if (unlikely(err)) {
-+		err = -EFAULT;
-+		AuTraceErr(err);
-+		goto out_free;
-+	}
-+	AuDbg("flags 0x%x\n", args->mvdown.flags);
-+	args->mvdown.flags &= ~(AUFS_MVDOWN_ROLOWER_R | AUFS_MVDOWN_ROUPPER_R);
-+	args->mvdown.au_errno = 0;
-+	args->dentry = dentry;
-+	args->inode = d_inode(dentry);
-+	args->sb = dentry->d_sb;
-+
-+	err = -ENOENT;
-+	dmsg = !!(args->mvdown.flags & AUFS_MVDOWN_DMSG);
-+	args->parent = dget_parent(dentry);
-+	args->dir = d_inode(args->parent);
-+	mutex_lock_nested(&args->dir->i_mutex, I_MUTEX_PARENT);
-+	dput(args->parent);
-+	if (unlikely(args->parent != dentry->d_parent)) {
-+		AU_MVD_PR(dmsg, "parent dir is moved\n");
-+		goto out_dir;
-+	}
-+
-+	mutex_lock_nested(&args->inode->i_mutex, I_MUTEX_CHILD);
-+	err = aufs_read_lock(dentry, AuLock_DW | AuLock_FLUSH);
-+	if (unlikely(err))
-+		goto out_inode;
-+
-+	di_write_lock_parent(args->parent);
-+	err = au_mvd_args(dmsg, args);
-+	if (unlikely(err))
-+		goto out_parent;
-+
-+	err = au_do_mvdown(dmsg, args);
-+	if (unlikely(err))
-+		goto out_parent;
-+
-+	au_cpup_attr_timesizes(args->dir);
-+	au_cpup_attr_timesizes(args->inode);
-+	au_cpup_igen(args->inode, au_h_iptr(args->inode, args->mvd_bdst));
-+	/* au_digen_dec(dentry); */
-+
-+out_parent:
-+	di_write_unlock(args->parent);
-+	aufs_read_unlock(dentry, AuLock_DW);
-+out_inode:
-+	mutex_unlock(&args->inode->i_mutex);
-+out_dir:
-+	mutex_unlock(&args->dir->i_mutex);
-+out_free:
-+	e = copy_to_user(uarg, &args->mvdown, sizeof(args->mvdown));
-+	if (unlikely(e))
-+		err = -EFAULT;
-+	kfree(args);
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-diff -Nur linux-4.1.10.orig/fs/aufs/opts.c linux-4.1.10/fs/aufs/opts.c
---- linux-4.1.10.orig/fs/aufs/opts.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/opts.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,1835 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * mount options/flags
-+ */
-+
-+#include <linux/namei.h>
-+#include <linux/types.h> /* a distribution requires */
-+#include <linux/parser.h>
-+#include "aufs.h"
-+
-+/* ---------------------------------------------------------------------- */
-+
-+enum {
-+	Opt_br,
-+	Opt_add, Opt_del, Opt_mod, Opt_append, Opt_prepend,
-+	Opt_idel, Opt_imod,
-+	Opt_dirwh, Opt_rdcache, Opt_rdblk, Opt_rdhash,
-+	Opt_rdblk_def, Opt_rdhash_def,
-+	Opt_xino, Opt_noxino,
-+	Opt_trunc_xino, Opt_trunc_xino_v, Opt_notrunc_xino,
-+	Opt_trunc_xino_path, Opt_itrunc_xino,
-+	Opt_trunc_xib, Opt_notrunc_xib,
-+	Opt_shwh, Opt_noshwh,
-+	Opt_plink, Opt_noplink, Opt_list_plink,
-+	Opt_udba,
-+	Opt_dio, Opt_nodio,
-+	Opt_diropq_a, Opt_diropq_w,
-+	Opt_warn_perm, Opt_nowarn_perm,
-+	Opt_wbr_copyup, Opt_wbr_create,
-+	Opt_fhsm_sec,
-+	Opt_verbose, Opt_noverbose,
-+	Opt_sum, Opt_nosum, Opt_wsum,
-+	Opt_dirperm1, Opt_nodirperm1,
-+	Opt_acl, Opt_noacl,
-+	Opt_tail, Opt_ignore, Opt_ignore_silent, Opt_err
-+};
-+
-+static match_table_t options = {
-+	{Opt_br, "br=%s"},
-+	{Opt_br, "br:%s"},
-+
-+	{Opt_add, "add=%d:%s"},
-+	{Opt_add, "add:%d:%s"},
-+	{Opt_add, "ins=%d:%s"},
-+	{Opt_add, "ins:%d:%s"},
-+	{Opt_append, "append=%s"},
-+	{Opt_append, "append:%s"},
-+	{Opt_prepend, "prepend=%s"},
-+	{Opt_prepend, "prepend:%s"},
-+
-+	{Opt_del, "del=%s"},
-+	{Opt_del, "del:%s"},
-+	/* {Opt_idel, "idel:%d"}, */
-+	{Opt_mod, "mod=%s"},
-+	{Opt_mod, "mod:%s"},
-+	/* {Opt_imod, "imod:%d:%s"}, */
-+
-+	{Opt_dirwh, "dirwh=%d"},
-+
-+	{Opt_xino, "xino=%s"},
-+	{Opt_noxino, "noxino"},
-+	{Opt_trunc_xino, "trunc_xino"},
-+	{Opt_trunc_xino_v, "trunc_xino_v=%d:%d"},
-+	{Opt_notrunc_xino, "notrunc_xino"},
-+	{Opt_trunc_xino_path, "trunc_xino=%s"},
-+	{Opt_itrunc_xino, "itrunc_xino=%d"},
-+	/* {Opt_zxino, "zxino=%s"}, */
-+	{Opt_trunc_xib, "trunc_xib"},
-+	{Opt_notrunc_xib, "notrunc_xib"},
-+
-+#ifdef CONFIG_PROC_FS
-+	{Opt_plink, "plink"},
-+#else
-+	{Opt_ignore_silent, "plink"},
-+#endif
-+
-+	{Opt_noplink, "noplink"},
-+
-+#ifdef CONFIG_AUFS_DEBUG
-+	{Opt_list_plink, "list_plink"},
-+#endif
-+
-+	{Opt_udba, "udba=%s"},
-+
-+	{Opt_dio, "dio"},
-+	{Opt_nodio, "nodio"},
-+
-+#ifdef CONFIG_AUFS_FHSM
-+	{Opt_fhsm_sec, "fhsm_sec=%d"},
-+#else
-+	{Opt_ignore_silent, "fhsm_sec=%d"},
-+#endif
-+
-+	{Opt_diropq_a, "diropq=always"},
-+	{Opt_diropq_a, "diropq=a"},
-+	{Opt_diropq_w, "diropq=whiteouted"},
-+	{Opt_diropq_w, "diropq=w"},
-+
-+	{Opt_warn_perm, "warn_perm"},
-+	{Opt_nowarn_perm, "nowarn_perm"},
-+
-+	/* keep them temporary */
-+	{Opt_ignore_silent, "nodlgt"},
-+	{Opt_ignore_silent, "clean_plink"},
-+
-+#ifdef CONFIG_AUFS_SHWH
-+	{Opt_shwh, "shwh"},
-+#endif
-+	{Opt_noshwh, "noshwh"},
-+
-+	{Opt_dirperm1, "dirperm1"},
-+	{Opt_nodirperm1, "nodirperm1"},
-+
-+	{Opt_verbose, "verbose"},
-+	{Opt_verbose, "v"},
-+	{Opt_noverbose, "noverbose"},
-+	{Opt_noverbose, "quiet"},
-+	{Opt_noverbose, "q"},
-+	{Opt_noverbose, "silent"},
-+
-+	{Opt_sum, "sum"},
-+	{Opt_nosum, "nosum"},
-+	{Opt_wsum, "wsum"},
-+
-+	{Opt_rdcache, "rdcache=%d"},
-+	{Opt_rdblk, "rdblk=%d"},
-+	{Opt_rdblk_def, "rdblk=def"},
-+	{Opt_rdhash, "rdhash=%d"},
-+	{Opt_rdhash_def, "rdhash=def"},
-+
-+	{Opt_wbr_create, "create=%s"},
-+	{Opt_wbr_create, "create_policy=%s"},
-+	{Opt_wbr_copyup, "cpup=%s"},
-+	{Opt_wbr_copyup, "copyup=%s"},
-+	{Opt_wbr_copyup, "copyup_policy=%s"},
-+
-+	/* generic VFS flag */
-+#ifdef CONFIG_FS_POSIX_ACL
-+	{Opt_acl, "acl"},
-+	{Opt_noacl, "noacl"},
-+#else
-+	{Opt_ignore_silent, "acl"},
-+	{Opt_ignore_silent, "noacl"},
-+#endif
-+
-+	/* internal use for the scripts */
-+	{Opt_ignore_silent, "si=%s"},
-+
-+	{Opt_br, "dirs=%s"},
-+	{Opt_ignore, "debug=%d"},
-+	{Opt_ignore, "delete=whiteout"},
-+	{Opt_ignore, "delete=all"},
-+	{Opt_ignore, "imap=%s"},
-+
-+	/* temporary workaround, due to old mount(8)? */
-+	{Opt_ignore_silent, "relatime"},
-+
-+	{Opt_err, NULL}
-+};
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static const char *au_parser_pattern(int val, match_table_t tbl)
-+{
-+	struct match_token *p;
-+
-+	p = tbl;
-+	while (p->pattern) {
-+		if (p->token == val)
-+			return p->pattern;
-+		p++;
-+	}
-+	BUG();
-+	return "??";
-+}
-+
-+static const char *au_optstr(int *val, match_table_t tbl)
-+{
-+	struct match_token *p;
-+	int v;
-+
-+	v = *val;
-+	if (!v)
-+		goto out;
-+	p = tbl;
-+	while (p->pattern) {
-+		if (p->token
-+		    && (v & p->token) == p->token) {
-+			*val &= ~p->token;
-+			return p->pattern;
-+		}
-+		p++;
-+	}
-+
-+out:
-+	return NULL;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static match_table_t brperm = {
-+	{AuBrPerm_RO, AUFS_BRPERM_RO},
-+	{AuBrPerm_RR, AUFS_BRPERM_RR},
-+	{AuBrPerm_RW, AUFS_BRPERM_RW},
-+	{0, NULL}
-+};
-+
-+static match_table_t brattr = {
-+	/* general */
-+	{AuBrAttr_COO_REG, AUFS_BRATTR_COO_REG},
-+	{AuBrAttr_COO_ALL, AUFS_BRATTR_COO_ALL},
-+	/* 'unpin' attrib is meaningless since linux-3.18-rc1 */
-+	{AuBrAttr_UNPIN, AUFS_BRATTR_UNPIN},
-+#ifdef CONFIG_AUFS_FHSM
-+	{AuBrAttr_FHSM, AUFS_BRATTR_FHSM},
-+#endif
-+#ifdef CONFIG_AUFS_XATTR
-+	{AuBrAttr_ICEX, AUFS_BRATTR_ICEX},
-+	{AuBrAttr_ICEX_SEC, AUFS_BRATTR_ICEX_SEC},
-+	{AuBrAttr_ICEX_SYS, AUFS_BRATTR_ICEX_SYS},
-+	{AuBrAttr_ICEX_TR, AUFS_BRATTR_ICEX_TR},
-+	{AuBrAttr_ICEX_USR, AUFS_BRATTR_ICEX_USR},
-+	{AuBrAttr_ICEX_OTH, AUFS_BRATTR_ICEX_OTH},
-+#endif
-+
-+	/* ro/rr branch */
-+	{AuBrRAttr_WH, AUFS_BRRATTR_WH},
-+
-+	/* rw branch */
-+	{AuBrWAttr_MOO, AUFS_BRWATTR_MOO},
-+	{AuBrWAttr_NoLinkWH, AUFS_BRWATTR_NLWH},
-+
-+	{0, NULL}
-+};
-+
-+static int br_attr_val(char *str, match_table_t table, substring_t args[])
-+{
-+	int attr, v;
-+	char *p;
-+
-+	attr = 0;
-+	do {
-+		p = strchr(str, '+');
-+		if (p)
-+			*p = 0;
-+		v = match_token(str, table, args);
-+		if (v) {
-+			if (v & AuBrAttr_CMOO_Mask)
-+				attr &= ~AuBrAttr_CMOO_Mask;
-+			attr |= v;
-+		} else {
-+			if (p)
-+				*p = '+';
-+			pr_warn("ignored branch attribute %s\n", str);
-+			break;
-+		}
-+		if (p)
-+			str = p + 1;
-+	} while (p);
-+
-+	return attr;
-+}
-+
-+static int au_do_optstr_br_attr(au_br_perm_str_t *str, int perm)
-+{
-+	int sz;
-+	const char *p;
-+	char *q;
-+
-+	q = str->a;
-+	*q = 0;
-+	p = au_optstr(&perm, brattr);
-+	if (p) {
-+		sz = strlen(p);
-+		memcpy(q, p, sz + 1);
-+		q += sz;
-+	} else
-+		goto out;
-+
-+	do {
-+		p = au_optstr(&perm, brattr);
-+		if (p) {
-+			*q++ = '+';
-+			sz = strlen(p);
-+			memcpy(q, p, sz + 1);
-+			q += sz;
-+		}
-+	} while (p);
-+
-+out:
-+	return q - str->a;
-+}
-+
-+static int noinline_for_stack br_perm_val(char *perm)
-+{
-+	int val, bad, sz;
-+	char *p;
-+	substring_t args[MAX_OPT_ARGS];
-+	au_br_perm_str_t attr;
-+
-+	p = strchr(perm, '+');
-+	if (p)
-+		*p = 0;
-+	val = match_token(perm, brperm, args);
-+	if (!val) {
-+		if (p)
-+			*p = '+';
-+		pr_warn("ignored branch permission %s\n", perm);
-+		val = AuBrPerm_RO;
-+		goto out;
-+	}
-+	if (!p)
-+		goto out;
-+
-+	val |= br_attr_val(p + 1, brattr, args);
-+
-+	bad = 0;
-+	switch (val & AuBrPerm_Mask) {
-+	case AuBrPerm_RO:
-+	case AuBrPerm_RR:
-+		bad = val & AuBrWAttr_Mask;
-+		val &= ~AuBrWAttr_Mask;
-+		break;
-+	case AuBrPerm_RW:
-+		bad = val & AuBrRAttr_Mask;
-+		val &= ~AuBrRAttr_Mask;
-+		break;
-+	}
-+
-+	/*
-+	 * 'unpin' attrib becomes meaningless since linux-3.18-rc1, but aufs
-+	 * does not treat it as an error, just warning.
-+	 * this is a tiny guard for the user operation.
-+	 */
-+	if (val & AuBrAttr_UNPIN) {
-+		bad |= AuBrAttr_UNPIN;
-+		val &= ~AuBrAttr_UNPIN;
-+	}
-+
-+	if (unlikely(bad)) {
-+		sz = au_do_optstr_br_attr(&attr, bad);
-+		AuDebugOn(!sz);
-+		pr_warn("ignored branch attribute %s\n", attr.a);
-+	}
-+
-+out:
-+	return val;
-+}
-+
-+void au_optstr_br_perm(au_br_perm_str_t *str, int perm)
-+{
-+	au_br_perm_str_t attr;
-+	const char *p;
-+	char *q;
-+	int sz;
-+
-+	q = str->a;
-+	p = au_optstr(&perm, brperm);
-+	AuDebugOn(!p || !*p);
-+	sz = strlen(p);
-+	memcpy(q, p, sz + 1);
-+	q += sz;
-+
-+	sz = au_do_optstr_br_attr(&attr, perm);
-+	if (sz) {
-+		*q++ = '+';
-+		memcpy(q, attr.a, sz + 1);
-+	}
-+
-+	AuDebugOn(strlen(str->a) >= sizeof(str->a));
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static match_table_t udbalevel = {
-+	{AuOpt_UDBA_REVAL, "reval"},
-+	{AuOpt_UDBA_NONE, "none"},
-+#ifdef CONFIG_AUFS_HNOTIFY
-+	{AuOpt_UDBA_HNOTIFY, "notify"}, /* abstraction */
-+#ifdef CONFIG_AUFS_HFSNOTIFY
-+	{AuOpt_UDBA_HNOTIFY, "fsnotify"},
-+#endif
-+#endif
-+	{-1, NULL}
-+};
-+
-+static int noinline_for_stack udba_val(char *str)
-+{
-+	substring_t args[MAX_OPT_ARGS];
-+
-+	return match_token(str, udbalevel, args);
-+}
-+
-+const char *au_optstr_udba(int udba)
-+{
-+	return au_parser_pattern(udba, udbalevel);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static match_table_t au_wbr_create_policy = {
-+	{AuWbrCreate_TDP, "tdp"},
-+	{AuWbrCreate_TDP, "top-down-parent"},
-+	{AuWbrCreate_RR, "rr"},
-+	{AuWbrCreate_RR, "round-robin"},
-+	{AuWbrCreate_MFS, "mfs"},
-+	{AuWbrCreate_MFS, "most-free-space"},
-+	{AuWbrCreate_MFSV, "mfs:%d"},
-+	{AuWbrCreate_MFSV, "most-free-space:%d"},
-+
-+	{AuWbrCreate_MFSRR, "mfsrr:%d"},
-+	{AuWbrCreate_MFSRRV, "mfsrr:%d:%d"},
-+	{AuWbrCreate_PMFS, "pmfs"},
-+	{AuWbrCreate_PMFSV, "pmfs:%d"},
-+	{AuWbrCreate_PMFSRR, "pmfsrr:%d"},
-+	{AuWbrCreate_PMFSRRV, "pmfsrr:%d:%d"},
-+
-+	{-1, NULL}
-+};
-+
-+/*
-+ * cf. linux/lib/parser.c and cmdline.c
-+ * gave up calling memparse() since it uses simple_strtoull() instead of
-+ * kstrto...().
-+ */
-+static int noinline_for_stack
-+au_match_ull(substring_t *s, unsigned long long *result)
-+{
-+	int err;
-+	unsigned int len;
-+	char a[32];
-+
-+	err = -ERANGE;
-+	len = s->to - s->from;
-+	if (len + 1 <= sizeof(a)) {
-+		memcpy(a, s->from, len);
-+		a[len] = '\0';
-+		err = kstrtoull(a, 0, result);
-+	}
-+	return err;
-+}
-+
-+static int au_wbr_mfs_wmark(substring_t *arg, char *str,
-+			    struct au_opt_wbr_create *create)
-+{
-+	int err;
-+	unsigned long long ull;
-+
-+	err = 0;
-+	if (!au_match_ull(arg, &ull))
-+		create->mfsrr_watermark = ull;
-+	else {
-+		pr_err("bad integer in %s\n", str);
-+		err = -EINVAL;
-+	}
-+
-+	return err;
-+}
-+
-+static int au_wbr_mfs_sec(substring_t *arg, char *str,
-+			  struct au_opt_wbr_create *create)
-+{
-+	int n, err;
-+
-+	err = 0;
-+	if (!match_int(arg, &n) && 0 <= n && n <= AUFS_MFS_MAX_SEC)
-+		create->mfs_second = n;
-+	else {
-+		pr_err("bad integer in %s\n", str);
-+		err = -EINVAL;
-+	}
-+
-+	return err;
-+}
-+
-+static int noinline_for_stack
-+au_wbr_create_val(char *str, struct au_opt_wbr_create *create)
-+{
-+	int err, e;
-+	substring_t args[MAX_OPT_ARGS];
-+
-+	err = match_token(str, au_wbr_create_policy, args);
-+	create->wbr_create = err;
-+	switch (err) {
-+	case AuWbrCreate_MFSRRV:
-+	case AuWbrCreate_PMFSRRV:
-+		e = au_wbr_mfs_wmark(&args[0], str, create);
-+		if (!e)
-+			e = au_wbr_mfs_sec(&args[1], str, create);
-+		if (unlikely(e))
-+			err = e;
-+		break;
-+	case AuWbrCreate_MFSRR:
-+	case AuWbrCreate_PMFSRR:
-+		e = au_wbr_mfs_wmark(&args[0], str, create);
-+		if (unlikely(e)) {
-+			err = e;
-+			break;
-+		}
-+		/*FALLTHROUGH*/
-+	case AuWbrCreate_MFS:
-+	case AuWbrCreate_PMFS:
-+		create->mfs_second = AUFS_MFS_DEF_SEC;
-+		break;
-+	case AuWbrCreate_MFSV:
-+	case AuWbrCreate_PMFSV:
-+		e = au_wbr_mfs_sec(&args[0], str, create);
-+		if (unlikely(e))
-+			err = e;
-+		break;
-+	}
-+
-+	return err;
-+}
-+
-+const char *au_optstr_wbr_create(int wbr_create)
-+{
-+	return au_parser_pattern(wbr_create, au_wbr_create_policy);
-+}
-+
-+static match_table_t au_wbr_copyup_policy = {
-+	{AuWbrCopyup_TDP, "tdp"},
-+	{AuWbrCopyup_TDP, "top-down-parent"},
-+	{AuWbrCopyup_BUP, "bup"},
-+	{AuWbrCopyup_BUP, "bottom-up-parent"},
-+	{AuWbrCopyup_BU, "bu"},
-+	{AuWbrCopyup_BU, "bottom-up"},
-+	{-1, NULL}
-+};
-+
-+static int noinline_for_stack au_wbr_copyup_val(char *str)
-+{
-+	substring_t args[MAX_OPT_ARGS];
-+
-+	return match_token(str, au_wbr_copyup_policy, args);
-+}
-+
-+const char *au_optstr_wbr_copyup(int wbr_copyup)
-+{
-+	return au_parser_pattern(wbr_copyup, au_wbr_copyup_policy);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static const int lkup_dirflags = LOOKUP_FOLLOW | LOOKUP_DIRECTORY;
-+
-+static void dump_opts(struct au_opts *opts)
-+{
-+#ifdef CONFIG_AUFS_DEBUG
-+	/* reduce stack space */
-+	union {
-+		struct au_opt_add *add;
-+		struct au_opt_del *del;
-+		struct au_opt_mod *mod;
-+		struct au_opt_xino *xino;
-+		struct au_opt_xino_itrunc *xino_itrunc;
-+		struct au_opt_wbr_create *create;
-+	} u;
-+	struct au_opt *opt;
-+
-+	opt = opts->opt;
-+	while (opt->type != Opt_tail) {
-+		switch (opt->type) {
-+		case Opt_add:
-+			u.add = &opt->add;
-+			AuDbg("add {b%d, %s, 0x%x, %p}\n",
-+				  u.add->bindex, u.add->pathname, u.add->perm,
-+				  u.add->path.dentry);
-+			break;
-+		case Opt_del:
-+		case Opt_idel:
-+			u.del = &opt->del;
-+			AuDbg("del {%s, %p}\n",
-+			      u.del->pathname, u.del->h_path.dentry);
-+			break;
-+		case Opt_mod:
-+		case Opt_imod:
-+			u.mod = &opt->mod;
-+			AuDbg("mod {%s, 0x%x, %p}\n",
-+				  u.mod->path, u.mod->perm, u.mod->h_root);
-+			break;
-+		case Opt_append:
-+			u.add = &opt->add;
-+			AuDbg("append {b%d, %s, 0x%x, %p}\n",
-+				  u.add->bindex, u.add->pathname, u.add->perm,
-+				  u.add->path.dentry);
-+			break;
-+		case Opt_prepend:
-+			u.add = &opt->add;
-+			AuDbg("prepend {b%d, %s, 0x%x, %p}\n",
-+				  u.add->bindex, u.add->pathname, u.add->perm,
-+				  u.add->path.dentry);
-+			break;
-+		case Opt_dirwh:
-+			AuDbg("dirwh %d\n", opt->dirwh);
-+			break;
-+		case Opt_rdcache:
-+			AuDbg("rdcache %d\n", opt->rdcache);
-+			break;
-+		case Opt_rdblk:
-+			AuDbg("rdblk %u\n", opt->rdblk);
-+			break;
-+		case Opt_rdblk_def:
-+			AuDbg("rdblk_def\n");
-+			break;
-+		case Opt_rdhash:
-+			AuDbg("rdhash %u\n", opt->rdhash);
-+			break;
-+		case Opt_rdhash_def:
-+			AuDbg("rdhash_def\n");
-+			break;
-+		case Opt_xino:
-+			u.xino = &opt->xino;
-+			AuDbg("xino {%s %pD}\n", u.xino->path, u.xino->file);
-+			break;
-+		case Opt_trunc_xino:
-+			AuLabel(trunc_xino);
-+			break;
-+		case Opt_notrunc_xino:
-+			AuLabel(notrunc_xino);
-+			break;
-+		case Opt_trunc_xino_path:
-+		case Opt_itrunc_xino:
-+			u.xino_itrunc = &opt->xino_itrunc;
-+			AuDbg("trunc_xino %d\n", u.xino_itrunc->bindex);
-+			break;
-+		case Opt_noxino:
-+			AuLabel(noxino);
-+			break;
-+		case Opt_trunc_xib:
-+			AuLabel(trunc_xib);
-+			break;
-+		case Opt_notrunc_xib:
-+			AuLabel(notrunc_xib);
-+			break;
-+		case Opt_shwh:
-+			AuLabel(shwh);
-+			break;
-+		case Opt_noshwh:
-+			AuLabel(noshwh);
-+			break;
-+		case Opt_dirperm1:
-+			AuLabel(dirperm1);
-+			break;
-+		case Opt_nodirperm1:
-+			AuLabel(nodirperm1);
-+			break;
-+		case Opt_plink:
-+			AuLabel(plink);
-+			break;
-+		case Opt_noplink:
-+			AuLabel(noplink);
-+			break;
-+		case Opt_list_plink:
-+			AuLabel(list_plink);
-+			break;
-+		case Opt_udba:
-+			AuDbg("udba %d, %s\n",
-+				  opt->udba, au_optstr_udba(opt->udba));
-+			break;
-+		case Opt_dio:
-+			AuLabel(dio);
-+			break;
-+		case Opt_nodio:
-+			AuLabel(nodio);
-+			break;
-+		case Opt_diropq_a:
-+			AuLabel(diropq_a);
-+			break;
-+		case Opt_diropq_w:
-+			AuLabel(diropq_w);
-+			break;
-+		case Opt_warn_perm:
-+			AuLabel(warn_perm);
-+			break;
-+		case Opt_nowarn_perm:
-+			AuLabel(nowarn_perm);
-+			break;
-+		case Opt_verbose:
-+			AuLabel(verbose);
-+			break;
-+		case Opt_noverbose:
-+			AuLabel(noverbose);
-+			break;
-+		case Opt_sum:
-+			AuLabel(sum);
-+			break;
-+		case Opt_nosum:
-+			AuLabel(nosum);
-+			break;
-+		case Opt_wsum:
-+			AuLabel(wsum);
-+			break;
-+		case Opt_wbr_create:
-+			u.create = &opt->wbr_create;
-+			AuDbg("create %d, %s\n", u.create->wbr_create,
-+				  au_optstr_wbr_create(u.create->wbr_create));
-+			switch (u.create->wbr_create) {
-+			case AuWbrCreate_MFSV:
-+			case AuWbrCreate_PMFSV:
-+				AuDbg("%d sec\n", u.create->mfs_second);
-+				break;
-+			case AuWbrCreate_MFSRR:
-+				AuDbg("%llu watermark\n",
-+					  u.create->mfsrr_watermark);
-+				break;
-+			case AuWbrCreate_MFSRRV:
-+			case AuWbrCreate_PMFSRRV:
-+				AuDbg("%llu watermark, %d sec\n",
-+					  u.create->mfsrr_watermark,
-+					  u.create->mfs_second);
-+				break;
-+			}
-+			break;
-+		case Opt_wbr_copyup:
-+			AuDbg("copyup %d, %s\n", opt->wbr_copyup,
-+				  au_optstr_wbr_copyup(opt->wbr_copyup));
-+			break;
-+		case Opt_fhsm_sec:
-+			AuDbg("fhsm_sec %u\n", opt->fhsm_second);
-+			break;
-+		case Opt_acl:
-+			AuLabel(acl);
-+			break;
-+		case Opt_noacl:
-+			AuLabel(noacl);
-+			break;
-+		default:
-+			BUG();
-+		}
-+		opt++;
-+	}
-+#endif
-+}
-+
-+void au_opts_free(struct au_opts *opts)
-+{
-+	struct au_opt *opt;
-+
-+	opt = opts->opt;
-+	while (opt->type != Opt_tail) {
-+		switch (opt->type) {
-+		case Opt_add:
-+		case Opt_append:
-+		case Opt_prepend:
-+			path_put(&opt->add.path);
-+			break;
-+		case Opt_del:
-+		case Opt_idel:
-+			path_put(&opt->del.h_path);
-+			break;
-+		case Opt_mod:
-+		case Opt_imod:
-+			dput(opt->mod.h_root);
-+			break;
-+		case Opt_xino:
-+			fput(opt->xino.file);
-+			break;
-+		}
-+		opt++;
-+	}
-+}
-+
-+static int opt_add(struct au_opt *opt, char *opt_str, unsigned long sb_flags,
-+		   aufs_bindex_t bindex)
-+{
-+	int err;
-+	struct au_opt_add *add = &opt->add;
-+	char *p;
-+
-+	add->bindex = bindex;
-+	add->perm = AuBrPerm_RO;
-+	add->pathname = opt_str;
-+	p = strchr(opt_str, '=');
-+	if (p) {
-+		*p++ = 0;
-+		if (*p)
-+			add->perm = br_perm_val(p);
-+	}
-+
-+	err = vfsub_kern_path(add->pathname, lkup_dirflags, &add->path);
-+	if (!err) {
-+		if (!p) {
-+			add->perm = AuBrPerm_RO;
-+			if (au_test_fs_rr(add->path.dentry->d_sb))
-+				add->perm = AuBrPerm_RR;
-+			else if (!bindex && !(sb_flags & MS_RDONLY))
-+				add->perm = AuBrPerm_RW;
-+		}
-+		opt->type = Opt_add;
-+		goto out;
-+	}
-+	pr_err("lookup failed %s (%d)\n", add->pathname, err);
-+	err = -EINVAL;
-+
-+out:
-+	return err;
-+}
-+
-+static int au_opts_parse_del(struct au_opt_del *del, substring_t args[])
-+{
-+	int err;
-+
-+	del->pathname = args[0].from;
-+	AuDbg("del path %s\n", del->pathname);
-+
-+	err = vfsub_kern_path(del->pathname, lkup_dirflags, &del->h_path);
-+	if (unlikely(err))
-+		pr_err("lookup failed %s (%d)\n", del->pathname, err);
-+
-+	return err;
-+}
-+
-+#if 0 /* reserved for future use */
-+static int au_opts_parse_idel(struct super_block *sb, aufs_bindex_t bindex,
-+			      struct au_opt_del *del, substring_t args[])
-+{
-+	int err;
-+	struct dentry *root;
-+
-+	err = -EINVAL;
-+	root = sb->s_root;
-+	aufs_read_lock(root, AuLock_FLUSH);
-+	if (bindex < 0 || au_sbend(sb) < bindex) {
-+		pr_err("out of bounds, %d\n", bindex);
-+		goto out;
-+	}
-+
-+	err = 0;
-+	del->h_path.dentry = dget(au_h_dptr(root, bindex));
-+	del->h_path.mnt = mntget(au_sbr_mnt(sb, bindex));
-+
-+out:
-+	aufs_read_unlock(root, !AuLock_IR);
-+	return err;
-+}
-+#endif
-+
-+static int noinline_for_stack
-+au_opts_parse_mod(struct au_opt_mod *mod, substring_t args[])
-+{
-+	int err;
-+	struct path path;
-+	char *p;
-+
-+	err = -EINVAL;
-+	mod->path = args[0].from;
-+	p = strchr(mod->path, '=');
-+	if (unlikely(!p)) {
-+		pr_err("no permssion %s\n", args[0].from);
-+		goto out;
-+	}
-+
-+	*p++ = 0;
-+	err = vfsub_kern_path(mod->path, lkup_dirflags, &path);
-+	if (unlikely(err)) {
-+		pr_err("lookup failed %s (%d)\n", mod->path, err);
-+		goto out;
-+	}
-+
-+	mod->perm = br_perm_val(p);
-+	AuDbg("mod path %s, perm 0x%x, %s\n", mod->path, mod->perm, p);
-+	mod->h_root = dget(path.dentry);
-+	path_put(&path);
-+
-+out:
-+	return err;
-+}
-+
-+#if 0 /* reserved for future use */
-+static int au_opts_parse_imod(struct super_block *sb, aufs_bindex_t bindex,
-+			      struct au_opt_mod *mod, substring_t args[])
-+{
-+	int err;
-+	struct dentry *root;
-+
-+	err = -EINVAL;
-+	root = sb->s_root;
-+	aufs_read_lock(root, AuLock_FLUSH);
-+	if (bindex < 0 || au_sbend(sb) < bindex) {
-+		pr_err("out of bounds, %d\n", bindex);
-+		goto out;
-+	}
-+
-+	err = 0;
-+	mod->perm = br_perm_val(args[1].from);
-+	AuDbg("mod path %s, perm 0x%x, %s\n",
-+	      mod->path, mod->perm, args[1].from);
-+	mod->h_root = dget(au_h_dptr(root, bindex));
-+
-+out:
-+	aufs_read_unlock(root, !AuLock_IR);
-+	return err;
-+}
-+#endif
-+
-+static int au_opts_parse_xino(struct super_block *sb, struct au_opt_xino *xino,
-+			      substring_t args[])
-+{
-+	int err;
-+	struct file *file;
-+
-+	file = au_xino_create(sb, args[0].from, /*silent*/0);
-+	err = PTR_ERR(file);
-+	if (IS_ERR(file))
-+		goto out;
-+
-+	err = -EINVAL;
-+	if (unlikely(file->f_path.dentry->d_sb == sb)) {
-+		fput(file);
-+		pr_err("%s must be outside\n", args[0].from);
-+		goto out;
-+	}
-+
-+	err = 0;
-+	xino->file = file;
-+	xino->path = args[0].from;
-+
-+out:
-+	return err;
-+}
-+
-+static int noinline_for_stack
-+au_opts_parse_xino_itrunc_path(struct super_block *sb,
-+			       struct au_opt_xino_itrunc *xino_itrunc,
-+			       substring_t args[])
-+{
-+	int err;
-+	aufs_bindex_t bend, bindex;
-+	struct path path;
-+	struct dentry *root;
-+
-+	err = vfsub_kern_path(args[0].from, lkup_dirflags, &path);
-+	if (unlikely(err)) {
-+		pr_err("lookup failed %s (%d)\n", args[0].from, err);
-+		goto out;
-+	}
-+
-+	xino_itrunc->bindex = -1;
-+	root = sb->s_root;
-+	aufs_read_lock(root, AuLock_FLUSH);
-+	bend = au_sbend(sb);
-+	for (bindex = 0; bindex <= bend; bindex++) {
-+		if (au_h_dptr(root, bindex) == path.dentry) {
-+			xino_itrunc->bindex = bindex;
-+			break;
-+		}
-+	}
-+	aufs_read_unlock(root, !AuLock_IR);
-+	path_put(&path);
-+
-+	if (unlikely(xino_itrunc->bindex < 0)) {
-+		pr_err("no such branch %s\n", args[0].from);
-+		err = -EINVAL;
-+	}
-+
-+out:
-+	return err;
-+}
-+
-+/* called without aufs lock */
-+int au_opts_parse(struct super_block *sb, char *str, struct au_opts *opts)
-+{
-+	int err, n, token;
-+	aufs_bindex_t bindex;
-+	unsigned char skipped;
-+	struct dentry *root;
-+	struct au_opt *opt, *opt_tail;
-+	char *opt_str;
-+	/* reduce the stack space */
-+	union {
-+		struct au_opt_xino_itrunc *xino_itrunc;
-+		struct au_opt_wbr_create *create;
-+	} u;
-+	struct {
-+		substring_t args[MAX_OPT_ARGS];
-+	} *a;
-+
-+	err = -ENOMEM;
-+	a = kmalloc(sizeof(*a), GFP_NOFS);
-+	if (unlikely(!a))
-+		goto out;
-+
-+	root = sb->s_root;
-+	err = 0;
-+	bindex = 0;
-+	opt = opts->opt;
-+	opt_tail = opt + opts->max_opt - 1;
-+	opt->type = Opt_tail;
-+	while (!err && (opt_str = strsep(&str, ",")) && *opt_str) {
-+		err = -EINVAL;
-+		skipped = 0;
-+		token = match_token(opt_str, options, a->args);
-+		switch (token) {
-+		case Opt_br:
-+			err = 0;
-+			while (!err && (opt_str = strsep(&a->args[0].from, ":"))
-+			       && *opt_str) {
-+				err = opt_add(opt, opt_str, opts->sb_flags,
-+					      bindex++);
-+				if (unlikely(!err && ++opt > opt_tail)) {
-+					err = -E2BIG;
-+					break;
-+				}
-+				opt->type = Opt_tail;
-+				skipped = 1;
-+			}
-+			break;
-+		case Opt_add:
-+			if (unlikely(match_int(&a->args[0], &n))) {
-+				pr_err("bad integer in %s\n", opt_str);
-+				break;
-+			}
-+			bindex = n;
-+			err = opt_add(opt, a->args[1].from, opts->sb_flags,
-+				      bindex);
-+			if (!err)
-+				opt->type = token;
-+			break;
-+		case Opt_append:
-+			err = opt_add(opt, a->args[0].from, opts->sb_flags,
-+				      /*dummy bindex*/1);
-+			if (!err)
-+				opt->type = token;
-+			break;
-+		case Opt_prepend:
-+			err = opt_add(opt, a->args[0].from, opts->sb_flags,
-+				      /*bindex*/0);
-+			if (!err)
-+				opt->type = token;
-+			break;
-+		case Opt_del:
-+			err = au_opts_parse_del(&opt->del, a->args);
-+			if (!err)
-+				opt->type = token;
-+			break;
-+#if 0 /* reserved for future use */
-+		case Opt_idel:
-+			del->pathname = "(indexed)";
-+			if (unlikely(match_int(&args[0], &n))) {
-+				pr_err("bad integer in %s\n", opt_str);
-+				break;
-+			}
-+			err = au_opts_parse_idel(sb, n, &opt->del, a->args);
-+			if (!err)
-+				opt->type = token;
-+			break;
-+#endif
-+		case Opt_mod:
-+			err = au_opts_parse_mod(&opt->mod, a->args);
-+			if (!err)
-+				opt->type = token;
-+			break;
-+#ifdef IMOD /* reserved for future use */
-+		case Opt_imod:
-+			u.mod->path = "(indexed)";
-+			if (unlikely(match_int(&a->args[0], &n))) {
-+				pr_err("bad integer in %s\n", opt_str);
-+				break;
-+			}
-+			err = au_opts_parse_imod(sb, n, &opt->mod, a->args);
-+			if (!err)
-+				opt->type = token;
-+			break;
-+#endif
-+		case Opt_xino:
-+			err = au_opts_parse_xino(sb, &opt->xino, a->args);
-+			if (!err)
-+				opt->type = token;
-+			break;
-+
-+		case Opt_trunc_xino_path:
-+			err = au_opts_parse_xino_itrunc_path
-+				(sb, &opt->xino_itrunc, a->args);
-+			if (!err)
-+				opt->type = token;
-+			break;
-+
-+		case Opt_itrunc_xino:
-+			u.xino_itrunc = &opt->xino_itrunc;
-+			if (unlikely(match_int(&a->args[0], &n))) {
-+				pr_err("bad integer in %s\n", opt_str);
-+				break;
-+			}
-+			u.xino_itrunc->bindex = n;
-+			aufs_read_lock(root, AuLock_FLUSH);
-+			if (n < 0 || au_sbend(sb) < n) {
-+				pr_err("out of bounds, %d\n", n);
-+				aufs_read_unlock(root, !AuLock_IR);
-+				break;
-+			}
-+			aufs_read_unlock(root, !AuLock_IR);
-+			err = 0;
-+			opt->type = token;
-+			break;
-+
-+		case Opt_dirwh:
-+			if (unlikely(match_int(&a->args[0], &opt->dirwh)))
-+				break;
-+			err = 0;
-+			opt->type = token;
-+			break;
-+
-+		case Opt_rdcache:
-+			if (unlikely(match_int(&a->args[0], &n))) {
-+				pr_err("bad integer in %s\n", opt_str);
-+				break;
-+			}
-+			if (unlikely(n > AUFS_RDCACHE_MAX)) {
-+				pr_err("rdcache must be smaller than %d\n",
-+				       AUFS_RDCACHE_MAX);
-+				break;
-+			}
-+			opt->rdcache = n;
-+			err = 0;
-+			opt->type = token;
-+			break;
-+		case Opt_rdblk:
-+			if (unlikely(match_int(&a->args[0], &n)
-+				     || n < 0
-+				     || n > KMALLOC_MAX_SIZE)) {
-+				pr_err("bad integer in %s\n", opt_str);
-+				break;
-+			}
-+			if (unlikely(n && n < NAME_MAX)) {
-+				pr_err("rdblk must be larger than %d\n",
-+				       NAME_MAX);
-+				break;
-+			}
-+			opt->rdblk = n;
-+			err = 0;
-+			opt->type = token;
-+			break;
-+		case Opt_rdhash:
-+			if (unlikely(match_int(&a->args[0], &n)
-+				     || n < 0
-+				     || n * sizeof(struct hlist_head)
-+				     > KMALLOC_MAX_SIZE)) {
-+				pr_err("bad integer in %s\n", opt_str);
-+				break;
-+			}
-+			opt->rdhash = n;
-+			err = 0;
-+			opt->type = token;
-+			break;
-+
-+		case Opt_trunc_xino:
-+		case Opt_notrunc_xino:
-+		case Opt_noxino:
-+		case Opt_trunc_xib:
-+		case Opt_notrunc_xib:
-+		case Opt_shwh:
-+		case Opt_noshwh:
-+		case Opt_dirperm1:
-+		case Opt_nodirperm1:
-+		case Opt_plink:
-+		case Opt_noplink:
-+		case Opt_list_plink:
-+		case Opt_dio:
-+		case Opt_nodio:
-+		case Opt_diropq_a:
-+		case Opt_diropq_w:
-+		case Opt_warn_perm:
-+		case Opt_nowarn_perm:
-+		case Opt_verbose:
-+		case Opt_noverbose:
-+		case Opt_sum:
-+		case Opt_nosum:
-+		case Opt_wsum:
-+		case Opt_rdblk_def:
-+		case Opt_rdhash_def:
-+		case Opt_acl:
-+		case Opt_noacl:
-+			err = 0;
-+			opt->type = token;
-+			break;
-+
-+		case Opt_udba:
-+			opt->udba = udba_val(a->args[0].from);
-+			if (opt->udba >= 0) {
-+				err = 0;
-+				opt->type = token;
-+			} else
-+				pr_err("wrong value, %s\n", opt_str);
-+			break;
-+
-+		case Opt_wbr_create:
-+			u.create = &opt->wbr_create;
-+			u.create->wbr_create
-+				= au_wbr_create_val(a->args[0].from, u.create);
-+			if (u.create->wbr_create >= 0) {
-+				err = 0;
-+				opt->type = token;
-+			} else
-+				pr_err("wrong value, %s\n", opt_str);
-+			break;
-+		case Opt_wbr_copyup:
-+			opt->wbr_copyup = au_wbr_copyup_val(a->args[0].from);
-+			if (opt->wbr_copyup >= 0) {
-+				err = 0;
-+				opt->type = token;
-+			} else
-+				pr_err("wrong value, %s\n", opt_str);
-+			break;
-+
-+		case Opt_fhsm_sec:
-+			if (unlikely(match_int(&a->args[0], &n)
-+				     || n < 0)) {
-+				pr_err("bad integer in %s\n", opt_str);
-+				break;
-+			}
-+			if (sysaufs_brs) {
-+				opt->fhsm_second = n;
-+				opt->type = token;
-+			} else
-+				pr_warn("ignored %s\n", opt_str);
-+			err = 0;
-+			break;
-+
-+		case Opt_ignore:
-+			pr_warn("ignored %s\n", opt_str);
-+			/*FALLTHROUGH*/
-+		case Opt_ignore_silent:
-+			skipped = 1;
-+			err = 0;
-+			break;
-+		case Opt_err:
-+			pr_err("unknown option %s\n", opt_str);
-+			break;
-+		}
-+
-+		if (!err && !skipped) {
-+			if (unlikely(++opt > opt_tail)) {
-+				err = -E2BIG;
-+				opt--;
-+				opt->type = Opt_tail;
-+				break;
-+			}
-+			opt->type = Opt_tail;
-+		}
-+	}
-+
-+	kfree(a);
-+	dump_opts(opts);
-+	if (unlikely(err))
-+		au_opts_free(opts);
-+
-+out:
-+	return err;
-+}
-+
-+static int au_opt_wbr_create(struct super_block *sb,
-+			     struct au_opt_wbr_create *create)
-+{
-+	int err;
-+	struct au_sbinfo *sbinfo;
-+
-+	SiMustWriteLock(sb);
-+
-+	err = 1; /* handled */
-+	sbinfo = au_sbi(sb);
-+	if (sbinfo->si_wbr_create_ops->fin) {
-+		err = sbinfo->si_wbr_create_ops->fin(sb);
-+		if (!err)
-+			err = 1;
-+	}
-+
-+	sbinfo->si_wbr_create = create->wbr_create;
-+	sbinfo->si_wbr_create_ops = au_wbr_create_ops + create->wbr_create;
-+	switch (create->wbr_create) {
-+	case AuWbrCreate_MFSRRV:
-+	case AuWbrCreate_MFSRR:
-+	case AuWbrCreate_PMFSRR:
-+	case AuWbrCreate_PMFSRRV:
-+		sbinfo->si_wbr_mfs.mfsrr_watermark = create->mfsrr_watermark;
-+		/*FALLTHROUGH*/
-+	case AuWbrCreate_MFS:
-+	case AuWbrCreate_MFSV:
-+	case AuWbrCreate_PMFS:
-+	case AuWbrCreate_PMFSV:
-+		sbinfo->si_wbr_mfs.mfs_expire
-+			= msecs_to_jiffies(create->mfs_second * MSEC_PER_SEC);
-+		break;
-+	}
-+
-+	if (sbinfo->si_wbr_create_ops->init)
-+		sbinfo->si_wbr_create_ops->init(sb); /* ignore */
-+
-+	return err;
-+}
-+
-+/*
-+ * returns,
-+ * plus: processed without an error
-+ * zero: unprocessed
-+ */
-+static int au_opt_simple(struct super_block *sb, struct au_opt *opt,
-+			 struct au_opts *opts)
-+{
-+	int err;
-+	struct au_sbinfo *sbinfo;
-+
-+	SiMustWriteLock(sb);
-+
-+	err = 1; /* handled */
-+	sbinfo = au_sbi(sb);
-+	switch (opt->type) {
-+	case Opt_udba:
-+		sbinfo->si_mntflags &= ~AuOptMask_UDBA;
-+		sbinfo->si_mntflags |= opt->udba;
-+		opts->given_udba |= opt->udba;
-+		break;
-+
-+	case Opt_plink:
-+		au_opt_set(sbinfo->si_mntflags, PLINK);
-+		break;
-+	case Opt_noplink:
-+		if (au_opt_test(sbinfo->si_mntflags, PLINK))
-+			au_plink_put(sb, /*verbose*/1);
-+		au_opt_clr(sbinfo->si_mntflags, PLINK);
-+		break;
-+	case Opt_list_plink:
-+		if (au_opt_test(sbinfo->si_mntflags, PLINK))
-+			au_plink_list(sb);
-+		break;
-+
-+	case Opt_dio:
-+		au_opt_set(sbinfo->si_mntflags, DIO);
-+		au_fset_opts(opts->flags, REFRESH_DYAOP);
-+		break;
-+	case Opt_nodio:
-+		au_opt_clr(sbinfo->si_mntflags, DIO);
-+		au_fset_opts(opts->flags, REFRESH_DYAOP);
-+		break;
-+
-+	case Opt_fhsm_sec:
-+		au_fhsm_set(sbinfo, opt->fhsm_second);
-+		break;
-+
-+	case Opt_diropq_a:
-+		au_opt_set(sbinfo->si_mntflags, ALWAYS_DIROPQ);
-+		break;
-+	case Opt_diropq_w:
-+		au_opt_clr(sbinfo->si_mntflags, ALWAYS_DIROPQ);
-+		break;
-+
-+	case Opt_warn_perm:
-+		au_opt_set(sbinfo->si_mntflags, WARN_PERM);
-+		break;
-+	case Opt_nowarn_perm:
-+		au_opt_clr(sbinfo->si_mntflags, WARN_PERM);
-+		break;
-+
-+	case Opt_verbose:
-+		au_opt_set(sbinfo->si_mntflags, VERBOSE);
-+		break;
-+	case Opt_noverbose:
-+		au_opt_clr(sbinfo->si_mntflags, VERBOSE);
-+		break;
-+
-+	case Opt_sum:
-+		au_opt_set(sbinfo->si_mntflags, SUM);
-+		break;
-+	case Opt_wsum:
-+		au_opt_clr(sbinfo->si_mntflags, SUM);
-+		au_opt_set(sbinfo->si_mntflags, SUM_W);
-+	case Opt_nosum:
-+		au_opt_clr(sbinfo->si_mntflags, SUM);
-+		au_opt_clr(sbinfo->si_mntflags, SUM_W);
-+		break;
-+
-+	case Opt_wbr_create:
-+		err = au_opt_wbr_create(sb, &opt->wbr_create);
-+		break;
-+	case Opt_wbr_copyup:
-+		sbinfo->si_wbr_copyup = opt->wbr_copyup;
-+		sbinfo->si_wbr_copyup_ops = au_wbr_copyup_ops + opt->wbr_copyup;
-+		break;
-+
-+	case Opt_dirwh:
-+		sbinfo->si_dirwh = opt->dirwh;
-+		break;
-+
-+	case Opt_rdcache:
-+		sbinfo->si_rdcache
-+			= msecs_to_jiffies(opt->rdcache * MSEC_PER_SEC);
-+		break;
-+	case Opt_rdblk:
-+		sbinfo->si_rdblk = opt->rdblk;
-+		break;
-+	case Opt_rdblk_def:
-+		sbinfo->si_rdblk = AUFS_RDBLK_DEF;
-+		break;
-+	case Opt_rdhash:
-+		sbinfo->si_rdhash = opt->rdhash;
-+		break;
-+	case Opt_rdhash_def:
-+		sbinfo->si_rdhash = AUFS_RDHASH_DEF;
-+		break;
-+
-+	case Opt_shwh:
-+		au_opt_set(sbinfo->si_mntflags, SHWH);
-+		break;
-+	case Opt_noshwh:
-+		au_opt_clr(sbinfo->si_mntflags, SHWH);
-+		break;
-+
-+	case Opt_dirperm1:
-+		au_opt_set(sbinfo->si_mntflags, DIRPERM1);
-+		break;
-+	case Opt_nodirperm1:
-+		au_opt_clr(sbinfo->si_mntflags, DIRPERM1);
-+		break;
-+
-+	case Opt_trunc_xino:
-+		au_opt_set(sbinfo->si_mntflags, TRUNC_XINO);
-+		break;
-+	case Opt_notrunc_xino:
-+		au_opt_clr(sbinfo->si_mntflags, TRUNC_XINO);
-+		break;
-+
-+	case Opt_trunc_xino_path:
-+	case Opt_itrunc_xino:
-+		err = au_xino_trunc(sb, opt->xino_itrunc.bindex);
-+		if (!err)
-+			err = 1;
-+		break;
-+
-+	case Opt_trunc_xib:
-+		au_fset_opts(opts->flags, TRUNC_XIB);
-+		break;
-+	case Opt_notrunc_xib:
-+		au_fclr_opts(opts->flags, TRUNC_XIB);
-+		break;
-+
-+	case Opt_acl:
-+		sb->s_flags |= MS_POSIXACL;
-+		break;
-+	case Opt_noacl:
-+		sb->s_flags &= ~MS_POSIXACL;
-+		break;
-+
-+	default:
-+		err = 0;
-+		break;
-+	}
-+
-+	return err;
-+}
-+
-+/*
-+ * returns tri-state.
-+ * plus: processed without an error
-+ * zero: unprocessed
-+ * minus: error
-+ */
-+static int au_opt_br(struct super_block *sb, struct au_opt *opt,
-+		     struct au_opts *opts)
-+{
-+	int err, do_refresh;
-+
-+	err = 0;
-+	switch (opt->type) {
-+	case Opt_append:
-+		opt->add.bindex = au_sbend(sb) + 1;
-+		if (opt->add.bindex < 0)
-+			opt->add.bindex = 0;
-+		goto add;
-+	case Opt_prepend:
-+		opt->add.bindex = 0;
-+	add: /* indented label */
-+	case Opt_add:
-+		err = au_br_add(sb, &opt->add,
-+				au_ftest_opts(opts->flags, REMOUNT));
-+		if (!err) {
-+			err = 1;
-+			au_fset_opts(opts->flags, REFRESH);
-+		}
-+		break;
-+
-+	case Opt_del:
-+	case Opt_idel:
-+		err = au_br_del(sb, &opt->del,
-+				au_ftest_opts(opts->flags, REMOUNT));
-+		if (!err) {
-+			err = 1;
-+			au_fset_opts(opts->flags, TRUNC_XIB);
-+			au_fset_opts(opts->flags, REFRESH);
-+		}
-+		break;
-+
-+	case Opt_mod:
-+	case Opt_imod:
-+		err = au_br_mod(sb, &opt->mod,
-+				au_ftest_opts(opts->flags, REMOUNT),
-+				&do_refresh);
-+		if (!err) {
-+			err = 1;
-+			if (do_refresh)
-+				au_fset_opts(opts->flags, REFRESH);
-+		}
-+		break;
-+	}
-+
-+	return err;
-+}
-+
-+static int au_opt_xino(struct super_block *sb, struct au_opt *opt,
-+		       struct au_opt_xino **opt_xino,
-+		       struct au_opts *opts)
-+{
-+	int err;
-+	aufs_bindex_t bend, bindex;
-+	struct dentry *root, *parent, *h_root;
-+
-+	err = 0;
-+	switch (opt->type) {
-+	case Opt_xino:
-+		err = au_xino_set(sb, &opt->xino,
-+				  !!au_ftest_opts(opts->flags, REMOUNT));
-+		if (unlikely(err))
-+			break;
-+
-+		*opt_xino = &opt->xino;
-+		au_xino_brid_set(sb, -1);
-+
-+		/* safe d_parent access */
-+		parent = opt->xino.file->f_path.dentry->d_parent;
-+		root = sb->s_root;
-+		bend = au_sbend(sb);
-+		for (bindex = 0; bindex <= bend; bindex++) {
-+			h_root = au_h_dptr(root, bindex);
-+			if (h_root == parent) {
-+				au_xino_brid_set(sb, au_sbr_id(sb, bindex));
-+				break;
-+			}
-+		}
-+		break;
-+
-+	case Opt_noxino:
-+		au_xino_clr(sb);
-+		au_xino_brid_set(sb, -1);
-+		*opt_xino = (void *)-1;
-+		break;
-+	}
-+
-+	return err;
-+}
-+
-+int au_opts_verify(struct super_block *sb, unsigned long sb_flags,
-+		   unsigned int pending)
-+{
-+	int err, fhsm;
-+	aufs_bindex_t bindex, bend;
-+	unsigned char do_plink, skip, do_free;
-+	struct au_branch *br;
-+	struct au_wbr *wbr;
-+	struct dentry *root;
-+	struct inode *dir, *h_dir;
-+	struct au_sbinfo *sbinfo;
-+	struct au_hinode *hdir;
-+
-+	SiMustAnyLock(sb);
-+
-+	sbinfo = au_sbi(sb);
-+	AuDebugOn(!(sbinfo->si_mntflags & AuOptMask_UDBA));
-+
-+	if (!(sb_flags & MS_RDONLY)) {
-+		if (unlikely(!au_br_writable(au_sbr_perm(sb, 0))))
-+			pr_warn("first branch should be rw\n");
-+		if (unlikely(au_opt_test(sbinfo->si_mntflags, SHWH)))
-+			pr_warn("shwh should be used with ro\n");
-+	}
-+
-+	if (au_opt_test((sbinfo->si_mntflags | pending), UDBA_HNOTIFY)
-+	    && !au_opt_test(sbinfo->si_mntflags, XINO))
-+		pr_warn("udba=*notify requires xino\n");
-+
-+	if (au_opt_test(sbinfo->si_mntflags, DIRPERM1))
-+		pr_warn("dirperm1 breaks the protection"
-+			" by the permission bits on the lower branch\n");
-+
-+	err = 0;
-+	fhsm = 0;
-+	root = sb->s_root;
-+	dir = d_inode(root);
-+	do_plink = !!au_opt_test(sbinfo->si_mntflags, PLINK);
-+	bend = au_sbend(sb);
-+	for (bindex = 0; !err && bindex <= bend; bindex++) {
-+		skip = 0;
-+		h_dir = au_h_iptr(dir, bindex);
-+		br = au_sbr(sb, bindex);
-+
-+		if ((br->br_perm & AuBrAttr_ICEX)
-+		    && !h_dir->i_op->listxattr)
-+			br->br_perm &= ~AuBrAttr_ICEX;
-+#if 0
-+		if ((br->br_perm & AuBrAttr_ICEX_SEC)
-+		    && (au_br_sb(br)->s_flags & MS_NOSEC))
-+			br->br_perm &= ~AuBrAttr_ICEX_SEC;
-+#endif
-+
-+		do_free = 0;
-+		wbr = br->br_wbr;
-+		if (wbr)
-+			wbr_wh_read_lock(wbr);
-+
-+		if (!au_br_writable(br->br_perm)) {
-+			do_free = !!wbr;
-+			skip = (!wbr
-+				|| (!wbr->wbr_whbase
-+				    && !wbr->wbr_plink
-+				    && !wbr->wbr_orph));
-+		} else if (!au_br_wh_linkable(br->br_perm)) {
-+			/* skip = (!br->br_whbase && !br->br_orph); */
-+			skip = (!wbr || !wbr->wbr_whbase);
-+			if (skip && wbr) {
-+				if (do_plink)
-+					skip = !!wbr->wbr_plink;
-+				else
-+					skip = !wbr->wbr_plink;
-+			}
-+		} else {
-+			/* skip = (br->br_whbase && br->br_ohph); */
-+			skip = (wbr && wbr->wbr_whbase);
-+			if (skip) {
-+				if (do_plink)
-+					skip = !!wbr->wbr_plink;
-+				else
-+					skip = !wbr->wbr_plink;
-+			}
-+		}
-+		if (wbr)
-+			wbr_wh_read_unlock(wbr);
-+
-+		if (au_br_fhsm(br->br_perm)) {
-+			fhsm++;
-+			AuDebugOn(!br->br_fhsm);
-+		}
-+
-+		if (skip)
-+			continue;
-+
-+		hdir = au_hi(dir, bindex);
-+		au_hn_imtx_lock_nested(hdir, AuLsc_I_PARENT);
-+		if (wbr)
-+			wbr_wh_write_lock(wbr);
-+		err = au_wh_init(br, sb);
-+		if (wbr)
-+			wbr_wh_write_unlock(wbr);
-+		au_hn_imtx_unlock(hdir);
-+
-+		if (!err && do_free) {
-+			kfree(wbr);
-+			br->br_wbr = NULL;
-+		}
-+	}
-+
-+	if (fhsm >= 2) {
-+		au_fset_si(sbinfo, FHSM);
-+		for (bindex = bend; bindex >= 0; bindex--) {
-+			br = au_sbr(sb, bindex);
-+			if (au_br_fhsm(br->br_perm)) {
-+				au_fhsm_set_bottom(sb, bindex);
-+				break;
-+			}
-+		}
-+	} else {
-+		au_fclr_si(sbinfo, FHSM);
-+		au_fhsm_set_bottom(sb, -1);
-+	}
-+
-+	return err;
-+}
-+
-+int au_opts_mount(struct super_block *sb, struct au_opts *opts)
-+{
-+	int err;
-+	unsigned int tmp;
-+	aufs_bindex_t bindex, bend;
-+	struct au_opt *opt;
-+	struct au_opt_xino *opt_xino, xino;
-+	struct au_sbinfo *sbinfo;
-+	struct au_branch *br;
-+	struct inode *dir;
-+
-+	SiMustWriteLock(sb);
-+
-+	err = 0;
-+	opt_xino = NULL;
-+	opt = opts->opt;
-+	while (err >= 0 && opt->type != Opt_tail)
-+		err = au_opt_simple(sb, opt++, opts);
-+	if (err > 0)
-+		err = 0;
-+	else if (unlikely(err < 0))
-+		goto out;
-+
-+	/* disable xino and udba temporary */
-+	sbinfo = au_sbi(sb);
-+	tmp = sbinfo->si_mntflags;
-+	au_opt_clr(sbinfo->si_mntflags, XINO);
-+	au_opt_set_udba(sbinfo->si_mntflags, UDBA_REVAL);
-+
-+	opt = opts->opt;
-+	while (err >= 0 && opt->type != Opt_tail)
-+		err = au_opt_br(sb, opt++, opts);
-+	if (err > 0)
-+		err = 0;
-+	else if (unlikely(err < 0))
-+		goto out;
-+
-+	bend = au_sbend(sb);
-+	if (unlikely(bend < 0)) {
-+		err = -EINVAL;
-+		pr_err("no branches\n");
-+		goto out;
-+	}
-+
-+	if (au_opt_test(tmp, XINO))
-+		au_opt_set(sbinfo->si_mntflags, XINO);
-+	opt = opts->opt;
-+	while (!err && opt->type != Opt_tail)
-+		err = au_opt_xino(sb, opt++, &opt_xino, opts);
-+	if (unlikely(err))
-+		goto out;
-+
-+	err = au_opts_verify(sb, sb->s_flags, tmp);
-+	if (unlikely(err))
-+		goto out;
-+
-+	/* restore xino */
-+	if (au_opt_test(tmp, XINO) && !opt_xino) {
-+		xino.file = au_xino_def(sb);
-+		err = PTR_ERR(xino.file);
-+		if (IS_ERR(xino.file))
-+			goto out;
-+
-+		err = au_xino_set(sb, &xino, /*remount*/0);
-+		fput(xino.file);
-+		if (unlikely(err))
-+			goto out;
-+	}
-+
-+	/* restore udba */
-+	tmp &= AuOptMask_UDBA;
-+	sbinfo->si_mntflags &= ~AuOptMask_UDBA;
-+	sbinfo->si_mntflags |= tmp;
-+	bend = au_sbend(sb);
-+	for (bindex = 0; bindex <= bend; bindex++) {
-+		br = au_sbr(sb, bindex);
-+		err = au_hnotify_reset_br(tmp, br, br->br_perm);
-+		if (unlikely(err))
-+			AuIOErr("hnotify failed on br %d, %d, ignored\n",
-+				bindex, err);
-+		/* go on even if err */
-+	}
-+	if (au_opt_test(tmp, UDBA_HNOTIFY)) {
-+		dir = d_inode(sb->s_root);
-+		au_hn_reset(dir, au_hi_flags(dir, /*isdir*/1) & ~AuHi_XINO);
-+	}
-+
-+out:
-+	return err;
-+}
-+
-+int au_opts_remount(struct super_block *sb, struct au_opts *opts)
-+{
-+	int err, rerr;
-+	struct inode *dir;
-+	struct au_opt_xino *opt_xino;
-+	struct au_opt *opt;
-+	struct au_sbinfo *sbinfo;
-+
-+	SiMustWriteLock(sb);
-+
-+	dir = d_inode(sb->s_root);
-+	sbinfo = au_sbi(sb);
-+	err = 0;
-+	opt_xino = NULL;
-+	opt = opts->opt;
-+	while (err >= 0 && opt->type != Opt_tail) {
-+		err = au_opt_simple(sb, opt, opts);
-+		if (!err)
-+			err = au_opt_br(sb, opt, opts);
-+		if (!err)
-+			err = au_opt_xino(sb, opt, &opt_xino, opts);
-+		opt++;
-+	}
-+	if (err > 0)
-+		err = 0;
-+	AuTraceErr(err);
-+	/* go on even err */
-+
-+	rerr = au_opts_verify(sb, opts->sb_flags, /*pending*/0);
-+	if (unlikely(rerr && !err))
-+		err = rerr;
-+
-+	if (au_ftest_opts(opts->flags, TRUNC_XIB)) {
-+		rerr = au_xib_trunc(sb);
-+		if (unlikely(rerr && !err))
-+			err = rerr;
-+	}
-+
-+	/* will be handled by the caller */
-+	if (!au_ftest_opts(opts->flags, REFRESH)
-+	    && (opts->given_udba || au_opt_test(sbinfo->si_mntflags, XINO)))
-+		au_fset_opts(opts->flags, REFRESH);
-+
-+	AuDbg("status 0x%x\n", opts->flags);
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+unsigned int au_opt_udba(struct super_block *sb)
-+{
-+	return au_mntflags(sb) & AuOptMask_UDBA;
-+}
-diff -Nur linux-4.1.10.orig/fs/aufs/opts.h linux-4.1.10/fs/aufs/opts.h
---- linux-4.1.10.orig/fs/aufs/opts.h	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/opts.h	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,210 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * mount options/flags
-+ */
-+
-+#ifndef __AUFS_OPTS_H__
-+#define __AUFS_OPTS_H__
-+
-+#ifdef __KERNEL__
-+
-+#include <linux/path.h>
-+
-+struct file;
-+struct super_block;
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* mount flags */
-+#define AuOpt_XINO		1		/* external inode number bitmap
-+						   and translation table */
-+#define AuOpt_TRUNC_XINO	(1 << 1)	/* truncate xino files */
-+#define AuOpt_UDBA_NONE		(1 << 2)	/* users direct branch access */
-+#define AuOpt_UDBA_REVAL	(1 << 3)
-+#define AuOpt_UDBA_HNOTIFY	(1 << 4)
-+#define AuOpt_SHWH		(1 << 5)	/* show whiteout */
-+#define AuOpt_PLINK		(1 << 6)	/* pseudo-link */
-+#define AuOpt_DIRPERM1		(1 << 7)	/* ignore the lower dir's perm
-+						   bits */
-+#define AuOpt_ALWAYS_DIROPQ	(1 << 9)	/* policy to creating diropq */
-+#define AuOpt_SUM		(1 << 10)	/* summation for statfs(2) */
-+#define AuOpt_SUM_W		(1 << 11)	/* unimplemented */
-+#define AuOpt_WARN_PERM		(1 << 12)	/* warn when add-branch */
-+#define AuOpt_VERBOSE		(1 << 13)	/* busy inode when del-branch */
-+#define AuOpt_DIO		(1 << 14)	/* direct io */
-+
-+#ifndef CONFIG_AUFS_HNOTIFY
-+#undef AuOpt_UDBA_HNOTIFY
-+#define AuOpt_UDBA_HNOTIFY	0
-+#endif
-+#ifndef CONFIG_AUFS_SHWH
-+#undef AuOpt_SHWH
-+#define AuOpt_SHWH		0
-+#endif
-+
-+#define AuOpt_Def	(AuOpt_XINO \
-+			 | AuOpt_UDBA_REVAL \
-+			 | AuOpt_PLINK \
-+			 /* | AuOpt_DIRPERM1 */ \
-+			 | AuOpt_WARN_PERM)
-+#define AuOptMask_UDBA	(AuOpt_UDBA_NONE \
-+			 | AuOpt_UDBA_REVAL \
-+			 | AuOpt_UDBA_HNOTIFY)
-+
-+#define au_opt_test(flags, name)	(flags & AuOpt_##name)
-+#define au_opt_set(flags, name) do { \
-+	BUILD_BUG_ON(AuOpt_##name & AuOptMask_UDBA); \
-+	((flags) |= AuOpt_##name); \
-+} while (0)
-+#define au_opt_set_udba(flags, name) do { \
-+	(flags) &= ~AuOptMask_UDBA; \
-+	((flags) |= AuOpt_##name); \
-+} while (0)
-+#define au_opt_clr(flags, name) do { \
-+	((flags) &= ~AuOpt_##name); \
-+} while (0)
-+
-+static inline unsigned int au_opts_plink(unsigned int mntflags)
-+{
-+#ifdef CONFIG_PROC_FS
-+	return mntflags;
-+#else
-+	return mntflags & ~AuOpt_PLINK;
-+#endif
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* policies to select one among multiple writable branches */
-+enum {
-+	AuWbrCreate_TDP,	/* top down parent */
-+	AuWbrCreate_RR,		/* round robin */
-+	AuWbrCreate_MFS,	/* most free space */
-+	AuWbrCreate_MFSV,	/* mfs with seconds */
-+	AuWbrCreate_MFSRR,	/* mfs then rr */
-+	AuWbrCreate_MFSRRV,	/* mfs then rr with seconds */
-+	AuWbrCreate_PMFS,	/* parent and mfs */
-+	AuWbrCreate_PMFSV,	/* parent and mfs with seconds */
-+	AuWbrCreate_PMFSRR,	/* parent, mfs and round-robin */
-+	AuWbrCreate_PMFSRRV,	/* plus seconds */
-+
-+	AuWbrCreate_Def = AuWbrCreate_TDP
-+};
-+
-+enum {
-+	AuWbrCopyup_TDP,	/* top down parent */
-+	AuWbrCopyup_BUP,	/* bottom up parent */
-+	AuWbrCopyup_BU,		/* bottom up */
-+
-+	AuWbrCopyup_Def = AuWbrCopyup_TDP
-+};
-+
-+/* ---------------------------------------------------------------------- */
-+
-+struct au_opt_add {
-+	aufs_bindex_t	bindex;
-+	char		*pathname;
-+	int		perm;
-+	struct path	path;
-+};
-+
-+struct au_opt_del {
-+	char		*pathname;
-+	struct path	h_path;
-+};
-+
-+struct au_opt_mod {
-+	char		*path;
-+	int		perm;
-+	struct dentry	*h_root;
-+};
-+
-+struct au_opt_xino {
-+	char		*path;
-+	struct file	*file;
-+};
-+
-+struct au_opt_xino_itrunc {
-+	aufs_bindex_t	bindex;
-+};
-+
-+struct au_opt_wbr_create {
-+	int			wbr_create;
-+	int			mfs_second;
-+	unsigned long long	mfsrr_watermark;
-+};
-+
-+struct au_opt {
-+	int type;
-+	union {
-+		struct au_opt_xino	xino;
-+		struct au_opt_xino_itrunc xino_itrunc;
-+		struct au_opt_add	add;
-+		struct au_opt_del	del;
-+		struct au_opt_mod	mod;
-+		int			dirwh;
-+		int			rdcache;
-+		unsigned int		rdblk;
-+		unsigned int		rdhash;
-+		int			udba;
-+		struct au_opt_wbr_create wbr_create;
-+		int			wbr_copyup;
-+		unsigned int		fhsm_second;
-+	};
-+};
-+
-+/* opts flags */
-+#define AuOpts_REMOUNT		1
-+#define AuOpts_REFRESH		(1 << 1)
-+#define AuOpts_TRUNC_XIB	(1 << 2)
-+#define AuOpts_REFRESH_DYAOP	(1 << 3)
-+#define au_ftest_opts(flags, name)	((flags) & AuOpts_##name)
-+#define au_fset_opts(flags, name) \
-+	do { (flags) |= AuOpts_##name; } while (0)
-+#define au_fclr_opts(flags, name) \
-+	do { (flags) &= ~AuOpts_##name; } while (0)
-+
-+struct au_opts {
-+	struct au_opt	*opt;
-+	int		max_opt;
-+
-+	unsigned int	given_udba;
-+	unsigned int	flags;
-+	unsigned long	sb_flags;
-+};
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* opts.c */
-+void au_optstr_br_perm(au_br_perm_str_t *str, int perm);
-+const char *au_optstr_udba(int udba);
-+const char *au_optstr_wbr_copyup(int wbr_copyup);
-+const char *au_optstr_wbr_create(int wbr_create);
-+
-+void au_opts_free(struct au_opts *opts);
-+int au_opts_parse(struct super_block *sb, char *str, struct au_opts *opts);
-+int au_opts_verify(struct super_block *sb, unsigned long sb_flags,
-+		   unsigned int pending);
-+int au_opts_mount(struct super_block *sb, struct au_opts *opts);
-+int au_opts_remount(struct super_block *sb, struct au_opts *opts);
-+
-+unsigned int au_opt_udba(struct super_block *sb);
-+
-+#endif /* __KERNEL__ */
-+#endif /* __AUFS_OPTS_H__ */
-diff -Nur linux-4.1.10.orig/fs/aufs/plink.c linux-4.1.10/fs/aufs/plink.c
---- linux-4.1.10.orig/fs/aufs/plink.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/plink.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,528 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * pseudo-link
-+ */
-+
-+#include "aufs.h"
-+
-+/*
-+ * the pseudo-link maintenance mode.
-+ * during a user process maintains the pseudo-links,
-+ * prohibit adding a new plink and branch manipulation.
-+ *
-+ * Flags
-+ * NOPLM:
-+ *	For entry functions which will handle plink, and i_mutex is already held
-+ *	in VFS.
-+ *	They cannot wait and should return an error at once.
-+ *	Callers has to check the error.
-+ * NOPLMW:
-+ *	For entry functions which will handle plink, but i_mutex is not held
-+ *	in VFS.
-+ *	They can wait the plink maintenance mode to finish.
-+ *
-+ * They behave like F_SETLK and F_SETLKW.
-+ * If the caller never handle plink, then both flags are unnecessary.
-+ */
-+
-+int au_plink_maint(struct super_block *sb, int flags)
-+{
-+	int err;
-+	pid_t pid, ppid;
-+	struct au_sbinfo *sbi;
-+
-+	SiMustAnyLock(sb);
-+
-+	err = 0;
-+	if (!au_opt_test(au_mntflags(sb), PLINK))
-+		goto out;
-+
-+	sbi = au_sbi(sb);
-+	pid = sbi->si_plink_maint_pid;
-+	if (!pid || pid == current->pid)
-+		goto out;
-+
-+	/* todo: it highly depends upon /sbin/mount.aufs */
-+	rcu_read_lock();
-+	ppid = task_pid_vnr(rcu_dereference(current->real_parent));
-+	rcu_read_unlock();
-+	if (pid == ppid)
-+		goto out;
-+
-+	if (au_ftest_lock(flags, NOPLMW)) {
-+		/* if there is no i_mutex lock in VFS, we don't need to wait */
-+		/* AuDebugOn(!lockdep_depth(current)); */
-+		while (sbi->si_plink_maint_pid) {
-+			si_read_unlock(sb);
-+			/* gave up wake_up_bit() */
-+			wait_event(sbi->si_plink_wq, !sbi->si_plink_maint_pid);
-+
-+			if (au_ftest_lock(flags, FLUSH))
-+				au_nwt_flush(&sbi->si_nowait);
-+			si_noflush_read_lock(sb);
-+		}
-+	} else if (au_ftest_lock(flags, NOPLM)) {
-+		AuDbg("ppid %d, pid %d\n", ppid, pid);
-+		err = -EAGAIN;
-+	}
-+
-+out:
-+	return err;
-+}
-+
-+void au_plink_maint_leave(struct au_sbinfo *sbinfo)
-+{
-+	spin_lock(&sbinfo->si_plink_maint_lock);
-+	sbinfo->si_plink_maint_pid = 0;
-+	spin_unlock(&sbinfo->si_plink_maint_lock);
-+	wake_up_all(&sbinfo->si_plink_wq);
-+}
-+
-+int au_plink_maint_enter(struct super_block *sb)
-+{
-+	int err;
-+	struct au_sbinfo *sbinfo;
-+
-+	err = 0;
-+	sbinfo = au_sbi(sb);
-+	/* make sure i am the only one in this fs */
-+	si_write_lock(sb, AuLock_FLUSH);
-+	if (au_opt_test(au_mntflags(sb), PLINK)) {
-+		spin_lock(&sbinfo->si_plink_maint_lock);
-+		if (!sbinfo->si_plink_maint_pid)
-+			sbinfo->si_plink_maint_pid = current->pid;
-+		else
-+			err = -EBUSY;
-+		spin_unlock(&sbinfo->si_plink_maint_lock);
-+	}
-+	si_write_unlock(sb);
-+
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+#ifdef CONFIG_AUFS_DEBUG
-+void au_plink_list(struct super_block *sb)
-+{
-+	int i;
-+	struct au_sbinfo *sbinfo;
-+	struct hlist_head *plink_hlist;
-+	struct pseudo_link *plink;
-+
-+	SiMustAnyLock(sb);
-+
-+	sbinfo = au_sbi(sb);
-+	AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK));
-+	AuDebugOn(au_plink_maint(sb, AuLock_NOPLM));
-+
-+	for (i = 0; i < AuPlink_NHASH; i++) {
-+		plink_hlist = &sbinfo->si_plink[i].head;
-+		rcu_read_lock();
-+		hlist_for_each_entry_rcu(plink, plink_hlist, hlist)
-+			AuDbg("%lu\n", plink->inode->i_ino);
-+		rcu_read_unlock();
-+	}
-+}
-+#endif
-+
-+/* is the inode pseudo-linked? */
-+int au_plink_test(struct inode *inode)
-+{
-+	int found, i;
-+	struct au_sbinfo *sbinfo;
-+	struct hlist_head *plink_hlist;
-+	struct pseudo_link *plink;
-+
-+	sbinfo = au_sbi(inode->i_sb);
-+	AuRwMustAnyLock(&sbinfo->si_rwsem);
-+	AuDebugOn(!au_opt_test(au_mntflags(inode->i_sb), PLINK));
-+	AuDebugOn(au_plink_maint(inode->i_sb, AuLock_NOPLM));
-+
-+	found = 0;
-+	i = au_plink_hash(inode->i_ino);
-+	plink_hlist = &sbinfo->si_plink[i].head;
-+	rcu_read_lock();
-+	hlist_for_each_entry_rcu(plink, plink_hlist, hlist)
-+		if (plink->inode == inode) {
-+			found = 1;
-+			break;
-+		}
-+	rcu_read_unlock();
-+	return found;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/*
-+ * generate a name for plink.
-+ * the file will be stored under AUFS_WH_PLINKDIR.
-+ */
-+/* 20 is max digits length of ulong 64 */
-+#define PLINK_NAME_LEN	((20 + 1) * 2)
-+
-+static int plink_name(char *name, int len, struct inode *inode,
-+		      aufs_bindex_t bindex)
-+{
-+	int rlen;
-+	struct inode *h_inode;
-+
-+	h_inode = au_h_iptr(inode, bindex);
-+	rlen = snprintf(name, len, "%lu.%lu", inode->i_ino, h_inode->i_ino);
-+	return rlen;
-+}
-+
-+struct au_do_plink_lkup_args {
-+	struct dentry **errp;
-+	struct qstr *tgtname;
-+	struct dentry *h_parent;
-+	struct au_branch *br;
-+};
-+
-+static struct dentry *au_do_plink_lkup(struct qstr *tgtname,
-+				       struct dentry *h_parent,
-+				       struct au_branch *br)
-+{
-+	struct dentry *h_dentry;
-+	struct mutex *h_mtx;
-+
-+	h_mtx = &d_inode(h_parent)->i_mutex;
-+	mutex_lock_nested(h_mtx, AuLsc_I_CHILD2);
-+	h_dentry = vfsub_lkup_one(tgtname, h_parent);
-+	mutex_unlock(h_mtx);
-+	return h_dentry;
-+}
-+
-+static void au_call_do_plink_lkup(void *args)
-+{
-+	struct au_do_plink_lkup_args *a = args;
-+	*a->errp = au_do_plink_lkup(a->tgtname, a->h_parent, a->br);
-+}
-+
-+/* lookup the plink-ed @inode under the branch at @bindex */
-+struct dentry *au_plink_lkup(struct inode *inode, aufs_bindex_t bindex)
-+{
-+	struct dentry *h_dentry, *h_parent;
-+	struct au_branch *br;
-+	int wkq_err;
-+	char a[PLINK_NAME_LEN];
-+	struct qstr tgtname = QSTR_INIT(a, 0);
-+
-+	AuDebugOn(au_plink_maint(inode->i_sb, AuLock_NOPLM));
-+
-+	br = au_sbr(inode->i_sb, bindex);
-+	h_parent = br->br_wbr->wbr_plink;
-+	tgtname.len = plink_name(a, sizeof(a), inode, bindex);
-+
-+	if (!uid_eq(current_fsuid(), GLOBAL_ROOT_UID)) {
-+		struct au_do_plink_lkup_args args = {
-+			.errp		= &h_dentry,
-+			.tgtname	= &tgtname,
-+			.h_parent	= h_parent,
-+			.br		= br
-+		};
-+
-+		wkq_err = au_wkq_wait(au_call_do_plink_lkup, &args);
-+		if (unlikely(wkq_err))
-+			h_dentry = ERR_PTR(wkq_err);
-+	} else
-+		h_dentry = au_do_plink_lkup(&tgtname, h_parent, br);
-+
-+	return h_dentry;
-+}
-+
-+/* create a pseudo-link */
-+static int do_whplink(struct qstr *tgt, struct dentry *h_parent,
-+		      struct dentry *h_dentry, struct au_branch *br)
-+{
-+	int err;
-+	struct path h_path = {
-+		.mnt = au_br_mnt(br)
-+	};
-+	struct inode *h_dir, *delegated;
-+
-+	h_dir = d_inode(h_parent);
-+	mutex_lock_nested(&h_dir->i_mutex, AuLsc_I_CHILD2);
-+again:
-+	h_path.dentry = vfsub_lkup_one(tgt, h_parent);
-+	err = PTR_ERR(h_path.dentry);
-+	if (IS_ERR(h_path.dentry))
-+		goto out;
-+
-+	err = 0;
-+	/* wh.plink dir is not monitored */
-+	/* todo: is it really safe? */
-+	if (d_is_positive(h_path.dentry)
-+	    && d_inode(h_path.dentry) != d_inode(h_dentry)) {
-+		delegated = NULL;
-+		err = vfsub_unlink(h_dir, &h_path, &delegated, /*force*/0);
-+		if (unlikely(err == -EWOULDBLOCK)) {
-+			pr_warn("cannot retry for NFSv4 delegation"
-+				" for an internal unlink\n");
-+			iput(delegated);
-+		}
-+		dput(h_path.dentry);
-+		h_path.dentry = NULL;
-+		if (!err)
-+			goto again;
-+	}
-+	if (!err && d_is_negative(h_path.dentry)) {
-+		delegated = NULL;
-+		err = vfsub_link(h_dentry, h_dir, &h_path, &delegated);
-+		if (unlikely(err == -EWOULDBLOCK)) {
-+			pr_warn("cannot retry for NFSv4 delegation"
-+				" for an internal link\n");
-+			iput(delegated);
-+		}
-+	}
-+	dput(h_path.dentry);
-+
-+out:
-+	mutex_unlock(&h_dir->i_mutex);
-+	return err;
-+}
-+
-+struct do_whplink_args {
-+	int *errp;
-+	struct qstr *tgt;
-+	struct dentry *h_parent;
-+	struct dentry *h_dentry;
-+	struct au_branch *br;
-+};
-+
-+static void call_do_whplink(void *args)
-+{
-+	struct do_whplink_args *a = args;
-+	*a->errp = do_whplink(a->tgt, a->h_parent, a->h_dentry, a->br);
-+}
-+
-+static int whplink(struct dentry *h_dentry, struct inode *inode,
-+		   aufs_bindex_t bindex, struct au_branch *br)
-+{
-+	int err, wkq_err;
-+	struct au_wbr *wbr;
-+	struct dentry *h_parent;
-+	char a[PLINK_NAME_LEN];
-+	struct qstr tgtname = QSTR_INIT(a, 0);
-+
-+	wbr = au_sbr(inode->i_sb, bindex)->br_wbr;
-+	h_parent = wbr->wbr_plink;
-+	tgtname.len = plink_name(a, sizeof(a), inode, bindex);
-+
-+	/* always superio. */
-+	if (!uid_eq(current_fsuid(), GLOBAL_ROOT_UID)) {
-+		struct do_whplink_args args = {
-+			.errp		= &err,
-+			.tgt		= &tgtname,
-+			.h_parent	= h_parent,
-+			.h_dentry	= h_dentry,
-+			.br		= br
-+		};
-+		wkq_err = au_wkq_wait(call_do_whplink, &args);
-+		if (unlikely(wkq_err))
-+			err = wkq_err;
-+	} else
-+		err = do_whplink(&tgtname, h_parent, h_dentry, br);
-+
-+	return err;
-+}
-+
-+/* free a single plink */
-+static void do_put_plink(struct pseudo_link *plink, int do_del)
-+{
-+	if (do_del)
-+		hlist_del(&plink->hlist);
-+	iput(plink->inode);
-+	kfree(plink);
-+}
-+
-+static void do_put_plink_rcu(struct rcu_head *rcu)
-+{
-+	struct pseudo_link *plink;
-+
-+	plink = container_of(rcu, struct pseudo_link, rcu);
-+	iput(plink->inode);
-+	kfree(plink);
-+}
-+
-+/*
-+ * create a new pseudo-link for @h_dentry on @bindex.
-+ * the linked inode is held in aufs @inode.
-+ */
-+void au_plink_append(struct inode *inode, aufs_bindex_t bindex,
-+		     struct dentry *h_dentry)
-+{
-+	struct super_block *sb;
-+	struct au_sbinfo *sbinfo;
-+	struct hlist_head *plink_hlist;
-+	struct pseudo_link *plink, *tmp;
-+	struct au_sphlhead *sphl;
-+	int found, err, cnt, i;
-+
-+	sb = inode->i_sb;
-+	sbinfo = au_sbi(sb);
-+	AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK));
-+	AuDebugOn(au_plink_maint(sb, AuLock_NOPLM));
-+
-+	found = au_plink_test(inode);
-+	if (found)
-+		return;
-+
-+	i = au_plink_hash(inode->i_ino);
-+	sphl = sbinfo->si_plink + i;
-+	plink_hlist = &sphl->head;
-+	tmp = kmalloc(sizeof(*plink), GFP_NOFS);
-+	if (tmp)
-+		tmp->inode = au_igrab(inode);
-+	else {
-+		err = -ENOMEM;
-+		goto out;
-+	}
-+
-+	spin_lock(&sphl->spin);
-+	hlist_for_each_entry(plink, plink_hlist, hlist) {
-+		if (plink->inode == inode) {
-+			found = 1;
-+			break;
-+		}
-+	}
-+	if (!found)
-+		hlist_add_head_rcu(&tmp->hlist, plink_hlist);
-+	spin_unlock(&sphl->spin);
-+	if (!found) {
-+		cnt = au_sphl_count(sphl);
-+#define msg "unexpectedly unblanced or too many pseudo-links"
-+		if (cnt > AUFS_PLINK_WARN)
-+			AuWarn1(msg ", %d\n", cnt);
-+#undef msg
-+		err = whplink(h_dentry, inode, bindex, au_sbr(sb, bindex));
-+	} else {
-+		do_put_plink(tmp, 0);
-+		return;
-+	}
-+
-+out:
-+	if (unlikely(err)) {
-+		pr_warn("err %d, damaged pseudo link.\n", err);
-+		if (tmp) {
-+			au_sphl_del_rcu(&tmp->hlist, sphl);
-+			call_rcu(&tmp->rcu, do_put_plink_rcu);
-+		}
-+	}
-+}
-+
-+/* free all plinks */
-+void au_plink_put(struct super_block *sb, int verbose)
-+{
-+	int i, warned;
-+	struct au_sbinfo *sbinfo;
-+	struct hlist_head *plink_hlist;
-+	struct hlist_node *tmp;
-+	struct pseudo_link *plink;
-+
-+	SiMustWriteLock(sb);
-+
-+	sbinfo = au_sbi(sb);
-+	AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK));
-+	AuDebugOn(au_plink_maint(sb, AuLock_NOPLM));
-+
-+	/* no spin_lock since sbinfo is write-locked */
-+	warned = 0;
-+	for (i = 0; i < AuPlink_NHASH; i++) {
-+		plink_hlist = &sbinfo->si_plink[i].head;
-+		if (!warned && verbose && !hlist_empty(plink_hlist)) {
-+			pr_warn("pseudo-link is not flushed");
-+			warned = 1;
-+		}
-+		hlist_for_each_entry_safe(plink, tmp, plink_hlist, hlist)
-+			do_put_plink(plink, 0);
-+		INIT_HLIST_HEAD(plink_hlist);
-+	}
-+}
-+
-+void au_plink_clean(struct super_block *sb, int verbose)
-+{
-+	struct dentry *root;
-+
-+	root = sb->s_root;
-+	aufs_write_lock(root);
-+	if (au_opt_test(au_mntflags(sb), PLINK))
-+		au_plink_put(sb, verbose);
-+	aufs_write_unlock(root);
-+}
-+
-+static int au_plink_do_half_refresh(struct inode *inode, aufs_bindex_t br_id)
-+{
-+	int do_put;
-+	aufs_bindex_t bstart, bend, bindex;
-+
-+	do_put = 0;
-+	bstart = au_ibstart(inode);
-+	bend = au_ibend(inode);
-+	if (bstart >= 0) {
-+		for (bindex = bstart; bindex <= bend; bindex++) {
-+			if (!au_h_iptr(inode, bindex)
-+			    || au_ii_br_id(inode, bindex) != br_id)
-+				continue;
-+			au_set_h_iptr(inode, bindex, NULL, 0);
-+			do_put = 1;
-+			break;
-+		}
-+		if (do_put)
-+			for (bindex = bstart; bindex <= bend; bindex++)
-+				if (au_h_iptr(inode, bindex)) {
-+					do_put = 0;
-+					break;
-+				}
-+	} else
-+		do_put = 1;
-+
-+	return do_put;
-+}
-+
-+/* free the plinks on a branch specified by @br_id */
-+void au_plink_half_refresh(struct super_block *sb, aufs_bindex_t br_id)
-+{
-+	struct au_sbinfo *sbinfo;
-+	struct hlist_head *plink_hlist;
-+	struct hlist_node *tmp;
-+	struct pseudo_link *plink;
-+	struct inode *inode;
-+	int i, do_put;
-+
-+	SiMustWriteLock(sb);
-+
-+	sbinfo = au_sbi(sb);
-+	AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK));
-+	AuDebugOn(au_plink_maint(sb, AuLock_NOPLM));
-+
-+	/* no spin_lock since sbinfo is write-locked */
-+	for (i = 0; i < AuPlink_NHASH; i++) {
-+		plink_hlist = &sbinfo->si_plink[i].head;
-+		hlist_for_each_entry_safe(plink, tmp, plink_hlist, hlist) {
-+			inode = au_igrab(plink->inode);
-+			ii_write_lock_child(inode);
-+			do_put = au_plink_do_half_refresh(inode, br_id);
-+			if (do_put)
-+				do_put_plink(plink, 1);
-+			ii_write_unlock(inode);
-+			iput(inode);
-+		}
-+	}
-+}
-diff -Nur linux-4.1.10.orig/fs/aufs/poll.c linux-4.1.10/fs/aufs/poll.c
---- linux-4.1.10.orig/fs/aufs/poll.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/poll.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,52 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * poll operation
-+ * There is only one filesystem which implements ->poll operation, currently.
-+ */
-+
-+#include "aufs.h"
-+
-+unsigned int aufs_poll(struct file *file, poll_table *wait)
-+{
-+	unsigned int mask;
-+	int err;
-+	struct file *h_file;
-+	struct super_block *sb;
-+
-+	/* We should pretend an error happened. */
-+	mask = POLLERR /* | POLLIN | POLLOUT */;
-+	sb = file->f_path.dentry->d_sb;
-+	si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW);
-+
-+	h_file = au_read_pre(file, /*keep_fi*/0);
-+	err = PTR_ERR(h_file);
-+	if (IS_ERR(h_file))
-+		goto out;
-+
-+	/* it is not an error if h_file has no operation */
-+	mask = DEFAULT_POLLMASK;
-+	if (h_file->f_op->poll)
-+		mask = h_file->f_op->poll(h_file, wait);
-+	fput(h_file); /* instead of au_read_post() */
-+
-+out:
-+	si_read_unlock(sb);
-+	AuTraceErr((int)mask);
-+	return mask;
-+}
-diff -Nur linux-4.1.10.orig/fs/aufs/posix_acl.c linux-4.1.10/fs/aufs/posix_acl.c
---- linux-4.1.10.orig/fs/aufs/posix_acl.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/posix_acl.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,99 @@
-+/*
-+ * Copyright (C) 2014-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * posix acl operations
-+ */
-+
-+#include <linux/fs.h>
-+#include <linux/posix_acl.h>
-+#include "aufs.h"
-+
-+struct posix_acl *aufs_get_acl(struct inode *inode, int type)
-+{
-+	struct posix_acl *acl;
-+	int err;
-+	aufs_bindex_t bindex;
-+	struct inode *h_inode;
-+	struct super_block *sb;
-+
-+	acl = NULL;
-+	sb = inode->i_sb;
-+	si_read_lock(sb, AuLock_FLUSH);
-+	ii_read_lock_child(inode);
-+	if (!(sb->s_flags & MS_POSIXACL))
-+		goto out;
-+
-+	bindex = au_ibstart(inode);
-+	h_inode = au_h_iptr(inode, bindex);
-+	if (unlikely(!h_inode
-+		     || ((h_inode->i_mode & S_IFMT)
-+			 != (inode->i_mode & S_IFMT)))) {
-+		err = au_busy_or_stale();
-+		acl = ERR_PTR(err);
-+		goto out;
-+	}
-+
-+	/* always topmost only */
-+	acl = get_acl(h_inode, type);
-+
-+out:
-+	ii_read_unlock(inode);
-+	si_read_unlock(sb);
-+
-+	AuTraceErrPtr(acl);
-+	return acl;
-+}
-+
-+int aufs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
-+{
-+	int err;
-+	ssize_t ssz;
-+	struct dentry *dentry;
-+	struct au_srxattr arg = {
-+		.type = AU_ACL_SET,
-+		.u.acl_set = {
-+			.acl	= acl,
-+			.type	= type
-+		},
-+	};
-+
-+	mutex_lock(&inode->i_mutex);
-+	if (inode->i_ino == AUFS_ROOT_INO)
-+		dentry = dget(inode->i_sb->s_root);
-+	else {
-+		dentry = d_find_alias(inode);
-+		if (!dentry)
-+			dentry = d_find_any_alias(inode);
-+		if (!dentry) {
-+			pr_warn("cannot handle this inode, "
-+				"please report to aufs-users ML\n");
-+			err = -ENOENT;
-+			goto out;
-+		}
-+	}
-+
-+	ssz = au_srxattr(dentry, &arg);
-+	dput(dentry);
-+	err = ssz;
-+	if (ssz >= 0)
-+		err = 0;
-+
-+out:
-+	mutex_unlock(&inode->i_mutex);
-+	return err;
-+}
-diff -Nur linux-4.1.10.orig/fs/aufs/procfs.c linux-4.1.10/fs/aufs/procfs.c
---- linux-4.1.10.orig/fs/aufs/procfs.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/procfs.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,169 @@
-+/*
-+ * Copyright (C) 2010-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * procfs interfaces
-+ */
-+
-+#include <linux/proc_fs.h>
-+#include "aufs.h"
-+
-+static int au_procfs_plm_release(struct inode *inode, struct file *file)
-+{
-+	struct au_sbinfo *sbinfo;
-+
-+	sbinfo = file->private_data;
-+	if (sbinfo) {
-+		au_plink_maint_leave(sbinfo);
-+		kobject_put(&sbinfo->si_kobj);
-+	}
-+
-+	return 0;
-+}
-+
-+static void au_procfs_plm_write_clean(struct file *file)
-+{
-+	struct au_sbinfo *sbinfo;
-+
-+	sbinfo = file->private_data;
-+	if (sbinfo)
-+		au_plink_clean(sbinfo->si_sb, /*verbose*/0);
-+}
-+
-+static int au_procfs_plm_write_si(struct file *file, unsigned long id)
-+{
-+	int err;
-+	struct super_block *sb;
-+	struct au_sbinfo *sbinfo;
-+
-+	err = -EBUSY;
-+	if (unlikely(file->private_data))
-+		goto out;
-+
-+	sb = NULL;
-+	/* don't use au_sbilist_lock() here */
-+	spin_lock(&au_sbilist.spin);
-+	list_for_each_entry(sbinfo, &au_sbilist.head, si_list)
-+		if (id == sysaufs_si_id(sbinfo)) {
-+			kobject_get(&sbinfo->si_kobj);
-+			sb = sbinfo->si_sb;
-+			break;
-+		}
-+	spin_unlock(&au_sbilist.spin);
-+
-+	err = -EINVAL;
-+	if (unlikely(!sb))
-+		goto out;
-+
-+	err = au_plink_maint_enter(sb);
-+	if (!err)
-+		/* keep kobject_get() */
-+		file->private_data = sbinfo;
-+	else
-+		kobject_put(&sbinfo->si_kobj);
-+out:
-+	return err;
-+}
-+
-+/*
-+ * Accept a valid "si=xxxx" only.
-+ * Once it is accepted successfully, accept "clean" too.
-+ */
-+static ssize_t au_procfs_plm_write(struct file *file, const char __user *ubuf,
-+				   size_t count, loff_t *ppos)
-+{
-+	ssize_t err;
-+	unsigned long id;
-+	/* last newline is allowed */
-+	char buf[3 + sizeof(unsigned long) * 2 + 1];
-+
-+	err = -EACCES;
-+	if (unlikely(!capable(CAP_SYS_ADMIN)))
-+		goto out;
-+
-+	err = -EINVAL;
-+	if (unlikely(count > sizeof(buf)))
-+		goto out;
-+
-+	err = copy_from_user(buf, ubuf, count);
-+	if (unlikely(err)) {
-+		err = -EFAULT;
-+		goto out;
-+	}
-+	buf[count] = 0;
-+
-+	err = -EINVAL;
-+	if (!strcmp("clean", buf)) {
-+		au_procfs_plm_write_clean(file);
-+		goto out_success;
-+	} else if (unlikely(strncmp("si=", buf, 3)))
-+		goto out;
-+
-+	err = kstrtoul(buf + 3, 16, &id);
-+	if (unlikely(err))
-+		goto out;
-+
-+	err = au_procfs_plm_write_si(file, id);
-+	if (unlikely(err))
-+		goto out;
-+
-+out_success:
-+	err = count; /* success */
-+out:
-+	return err;
-+}
-+
-+static const struct file_operations au_procfs_plm_fop = {
-+	.write		= au_procfs_plm_write,
-+	.release	= au_procfs_plm_release,
-+	.owner		= THIS_MODULE
-+};
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static struct proc_dir_entry *au_procfs_dir;
-+
-+void au_procfs_fin(void)
-+{
-+	remove_proc_entry(AUFS_PLINK_MAINT_NAME, au_procfs_dir);
-+	remove_proc_entry(AUFS_PLINK_MAINT_DIR, NULL);
-+}
-+
-+int __init au_procfs_init(void)
-+{
-+	int err;
-+	struct proc_dir_entry *entry;
-+
-+	err = -ENOMEM;
-+	au_procfs_dir = proc_mkdir(AUFS_PLINK_MAINT_DIR, NULL);
-+	if (unlikely(!au_procfs_dir))
-+		goto out;
-+
-+	entry = proc_create(AUFS_PLINK_MAINT_NAME, S_IFREG | S_IWUSR,
-+			    au_procfs_dir, &au_procfs_plm_fop);
-+	if (unlikely(!entry))
-+		goto out_dir;
-+
-+	err = 0;
-+	goto out; /* success */
-+
-+
-+out_dir:
-+	remove_proc_entry(AUFS_PLINK_MAINT_DIR, NULL);
-+out:
-+	return err;
-+}
-diff -Nur linux-4.1.10.orig/fs/aufs/rdu.c linux-4.1.10/fs/aufs/rdu.c
---- linux-4.1.10.orig/fs/aufs/rdu.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/rdu.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,388 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * readdir in userspace.
-+ */
-+
-+#include <linux/compat.h>
-+#include <linux/fs_stack.h>
-+#include <linux/security.h>
-+#include "aufs.h"
-+
-+/* bits for struct aufs_rdu.flags */
-+#define	AuRdu_CALLED	1
-+#define	AuRdu_CONT	(1 << 1)
-+#define	AuRdu_FULL	(1 << 2)
-+#define au_ftest_rdu(flags, name)	((flags) & AuRdu_##name)
-+#define au_fset_rdu(flags, name) \
-+	do { (flags) |= AuRdu_##name; } while (0)
-+#define au_fclr_rdu(flags, name) \
-+	do { (flags) &= ~AuRdu_##name; } while (0)
-+
-+struct au_rdu_arg {
-+	struct dir_context		ctx;
-+	struct aufs_rdu			*rdu;
-+	union au_rdu_ent_ul		ent;
-+	unsigned long			end;
-+
-+	struct super_block		*sb;
-+	int				err;
-+};
-+
-+static int au_rdu_fill(struct dir_context *ctx, const char *name, int nlen,
-+		       loff_t offset, u64 h_ino, unsigned int d_type)
-+{
-+	int err, len;
-+	struct au_rdu_arg *arg = container_of(ctx, struct au_rdu_arg, ctx);
-+	struct aufs_rdu *rdu = arg->rdu;
-+	struct au_rdu_ent ent;
-+
-+	err = 0;
-+	arg->err = 0;
-+	au_fset_rdu(rdu->cookie.flags, CALLED);
-+	len = au_rdu_len(nlen);
-+	if (arg->ent.ul + len  < arg->end) {
-+		ent.ino = h_ino;
-+		ent.bindex = rdu->cookie.bindex;
-+		ent.type = d_type;
-+		ent.nlen = nlen;
-+		if (unlikely(nlen > AUFS_MAX_NAMELEN))
-+			ent.type = DT_UNKNOWN;
-+
-+		/* unnecessary to support mmap_sem since this is a dir */
-+		err = -EFAULT;
-+		if (copy_to_user(arg->ent.e, &ent, sizeof(ent)))
-+			goto out;
-+		if (copy_to_user(arg->ent.e->name, name, nlen))
-+			goto out;
-+		/* the terminating NULL */
-+		if (__put_user(0, arg->ent.e->name + nlen))
-+			goto out;
-+		err = 0;
-+		/* AuDbg("%p, %.*s\n", arg->ent.p, nlen, name); */
-+		arg->ent.ul += len;
-+		rdu->rent++;
-+	} else {
-+		err = -EFAULT;
-+		au_fset_rdu(rdu->cookie.flags, FULL);
-+		rdu->full = 1;
-+		rdu->tail = arg->ent;
-+	}
-+
-+out:
-+	/* AuTraceErr(err); */
-+	return err;
-+}
-+
-+static int au_rdu_do(struct file *h_file, struct au_rdu_arg *arg)
-+{
-+	int err;
-+	loff_t offset;
-+	struct au_rdu_cookie *cookie = &arg->rdu->cookie;
-+
-+	/* we don't have to care (FMODE_32BITHASH | FMODE_64BITHASH) for ext4 */
-+	offset = vfsub_llseek(h_file, cookie->h_pos, SEEK_SET);
-+	err = offset;
-+	if (unlikely(offset != cookie->h_pos))
-+		goto out;
-+
-+	err = 0;
-+	do {
-+		arg->err = 0;
-+		au_fclr_rdu(cookie->flags, CALLED);
-+		/* smp_mb(); */
-+		err = vfsub_iterate_dir(h_file, &arg->ctx);
-+		if (err >= 0)
-+			err = arg->err;
-+	} while (!err
-+		 && au_ftest_rdu(cookie->flags, CALLED)
-+		 && !au_ftest_rdu(cookie->flags, FULL));
-+	cookie->h_pos = h_file->f_pos;
-+
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+static int au_rdu(struct file *file, struct aufs_rdu *rdu)
-+{
-+	int err;
-+	aufs_bindex_t bend;
-+	struct au_rdu_arg arg = {
-+		.ctx = {
-+			.actor = au_rdu_fill
-+		}
-+	};
-+	struct dentry *dentry;
-+	struct inode *inode;
-+	struct file *h_file;
-+	struct au_rdu_cookie *cookie = &rdu->cookie;
-+
-+	err = !access_ok(VERIFY_WRITE, rdu->ent.e, rdu->sz);
-+	if (unlikely(err)) {
-+		err = -EFAULT;
-+		AuTraceErr(err);
-+		goto out;
-+	}
-+	rdu->rent = 0;
-+	rdu->tail = rdu->ent;
-+	rdu->full = 0;
-+	arg.rdu = rdu;
-+	arg.ent = rdu->ent;
-+	arg.end = arg.ent.ul;
-+	arg.end += rdu->sz;
-+
-+	err = -ENOTDIR;
-+	if (unlikely(!file->f_op->iterate))
-+		goto out;
-+
-+	err = security_file_permission(file, MAY_READ);
-+	AuTraceErr(err);
-+	if (unlikely(err))
-+		goto out;
-+
-+	dentry = file->f_path.dentry;
-+	inode = d_inode(dentry);
-+#if 1
-+	mutex_lock(&inode->i_mutex);
-+#else
-+	err = mutex_lock_killable(&inode->i_mutex);
-+	AuTraceErr(err);
-+	if (unlikely(err))
-+		goto out;
-+#endif
-+
-+	arg.sb = inode->i_sb;
-+	err = si_read_lock(arg.sb, AuLock_FLUSH | AuLock_NOPLM);
-+	if (unlikely(err))
-+		goto out_mtx;
-+	err = au_alive_dir(dentry);
-+	if (unlikely(err))
-+		goto out_si;
-+	/* todo: reval? */
-+	fi_read_lock(file);
-+
-+	err = -EAGAIN;
-+	if (unlikely(au_ftest_rdu(cookie->flags, CONT)
-+		     && cookie->generation != au_figen(file)))
-+		goto out_unlock;
-+
-+	err = 0;
-+	if (!rdu->blk) {
-+		rdu->blk = au_sbi(arg.sb)->si_rdblk;
-+		if (!rdu->blk)
-+			rdu->blk = au_dir_size(file, /*dentry*/NULL);
-+	}
-+	bend = au_fbstart(file);
-+	if (cookie->bindex < bend)
-+		cookie->bindex = bend;
-+	bend = au_fbend_dir(file);
-+	/* AuDbg("b%d, b%d\n", cookie->bindex, bend); */
-+	for (; !err && cookie->bindex <= bend;
-+	     cookie->bindex++, cookie->h_pos = 0) {
-+		h_file = au_hf_dir(file, cookie->bindex);
-+		if (!h_file)
-+			continue;
-+
-+		au_fclr_rdu(cookie->flags, FULL);
-+		err = au_rdu_do(h_file, &arg);
-+		AuTraceErr(err);
-+		if (unlikely(au_ftest_rdu(cookie->flags, FULL) || err))
-+			break;
-+	}
-+	AuDbg("rent %llu\n", rdu->rent);
-+
-+	if (!err && !au_ftest_rdu(cookie->flags, CONT)) {
-+		rdu->shwh = !!au_opt_test(au_sbi(arg.sb)->si_mntflags, SHWH);
-+		au_fset_rdu(cookie->flags, CONT);
-+		cookie->generation = au_figen(file);
-+	}
-+
-+	ii_read_lock_child(inode);
-+	fsstack_copy_attr_atime(inode, au_h_iptr(inode, au_ibstart(inode)));
-+	ii_read_unlock(inode);
-+
-+out_unlock:
-+	fi_read_unlock(file);
-+out_si:
-+	si_read_unlock(arg.sb);
-+out_mtx:
-+	mutex_unlock(&inode->i_mutex);
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+static int au_rdu_ino(struct file *file, struct aufs_rdu *rdu)
-+{
-+	int err;
-+	ino_t ino;
-+	unsigned long long nent;
-+	union au_rdu_ent_ul *u;
-+	struct au_rdu_ent ent;
-+	struct super_block *sb;
-+
-+	err = 0;
-+	nent = rdu->nent;
-+	u = &rdu->ent;
-+	sb = file->f_path.dentry->d_sb;
-+	si_read_lock(sb, AuLock_FLUSH);
-+	while (nent-- > 0) {
-+		/* unnecessary to support mmap_sem since this is a dir */
-+		err = copy_from_user(&ent, u->e, sizeof(ent));
-+		if (!err)
-+			err = !access_ok(VERIFY_WRITE, &u->e->ino, sizeof(ino));
-+		if (unlikely(err)) {
-+			err = -EFAULT;
-+			AuTraceErr(err);
-+			break;
-+		}
-+
-+		/* AuDbg("b%d, i%llu\n", ent.bindex, ent.ino); */
-+		if (!ent.wh)
-+			err = au_ino(sb, ent.bindex, ent.ino, ent.type, &ino);
-+		else
-+			err = au_wh_ino(sb, ent.bindex, ent.ino, ent.type,
-+					&ino);
-+		if (unlikely(err)) {
-+			AuTraceErr(err);
-+			break;
-+		}
-+
-+		err = __put_user(ino, &u->e->ino);
-+		if (unlikely(err)) {
-+			err = -EFAULT;
-+			AuTraceErr(err);
-+			break;
-+		}
-+		u->ul += au_rdu_len(ent.nlen);
-+	}
-+	si_read_unlock(sb);
-+
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static int au_rdu_verify(struct aufs_rdu *rdu)
-+{
-+	AuDbg("rdu{%llu, %p, %u | %u | %llu, %u, %u | "
-+	      "%llu, b%d, 0x%x, g%u}\n",
-+	      rdu->sz, rdu->ent.e, rdu->verify[AufsCtlRduV_SZ],
-+	      rdu->blk,
-+	      rdu->rent, rdu->shwh, rdu->full,
-+	      rdu->cookie.h_pos, rdu->cookie.bindex, rdu->cookie.flags,
-+	      rdu->cookie.generation);
-+
-+	if (rdu->verify[AufsCtlRduV_SZ] == sizeof(*rdu))
-+		return 0;
-+
-+	AuDbg("%u:%u\n",
-+	      rdu->verify[AufsCtlRduV_SZ], (unsigned int)sizeof(*rdu));
-+	return -EINVAL;
-+}
-+
-+long au_rdu_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
-+{
-+	long err, e;
-+	struct aufs_rdu rdu;
-+	void __user *p = (void __user *)arg;
-+
-+	err = copy_from_user(&rdu, p, sizeof(rdu));
-+	if (unlikely(err)) {
-+		err = -EFAULT;
-+		AuTraceErr(err);
-+		goto out;
-+	}
-+	err = au_rdu_verify(&rdu);
-+	if (unlikely(err))
-+		goto out;
-+
-+	switch (cmd) {
-+	case AUFS_CTL_RDU:
-+		err = au_rdu(file, &rdu);
-+		if (unlikely(err))
-+			break;
-+
-+		e = copy_to_user(p, &rdu, sizeof(rdu));
-+		if (unlikely(e)) {
-+			err = -EFAULT;
-+			AuTraceErr(err);
-+		}
-+		break;
-+	case AUFS_CTL_RDU_INO:
-+		err = au_rdu_ino(file, &rdu);
-+		break;
-+
-+	default:
-+		/* err = -ENOTTY; */
-+		err = -EINVAL;
-+	}
-+
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+#ifdef CONFIG_COMPAT
-+long au_rdu_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
-+{
-+	long err, e;
-+	struct aufs_rdu rdu;
-+	void __user *p = compat_ptr(arg);
-+
-+	/* todo: get_user()? */
-+	err = copy_from_user(&rdu, p, sizeof(rdu));
-+	if (unlikely(err)) {
-+		err = -EFAULT;
-+		AuTraceErr(err);
-+		goto out;
-+	}
-+	rdu.ent.e = compat_ptr(rdu.ent.ul);
-+	err = au_rdu_verify(&rdu);
-+	if (unlikely(err))
-+		goto out;
-+
-+	switch (cmd) {
-+	case AUFS_CTL_RDU:
-+		err = au_rdu(file, &rdu);
-+		if (unlikely(err))
-+			break;
-+
-+		rdu.ent.ul = ptr_to_compat(rdu.ent.e);
-+		rdu.tail.ul = ptr_to_compat(rdu.tail.e);
-+		e = copy_to_user(p, &rdu, sizeof(rdu));
-+		if (unlikely(e)) {
-+			err = -EFAULT;
-+			AuTraceErr(err);
-+		}
-+		break;
-+	case AUFS_CTL_RDU_INO:
-+		err = au_rdu_ino(file, &rdu);
-+		break;
-+
-+	default:
-+		/* err = -ENOTTY; */
-+		err = -EINVAL;
-+	}
-+
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-+#endif
-diff -Nur linux-4.1.10.orig/fs/aufs/rwsem.h linux-4.1.10/fs/aufs/rwsem.h
---- linux-4.1.10.orig/fs/aufs/rwsem.h	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/rwsem.h	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,191 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * simple read-write semaphore wrappers
-+ */
-+
-+#ifndef __AUFS_RWSEM_H__
-+#define __AUFS_RWSEM_H__
-+
-+#ifdef __KERNEL__
-+
-+#include "debug.h"
-+
-+struct au_rwsem {
-+	struct rw_semaphore	rwsem;
-+#ifdef CONFIG_AUFS_DEBUG
-+	/* just for debugging, not almighty counter */
-+	atomic_t		rcnt, wcnt;
-+#endif
-+};
-+
-+#ifdef CONFIG_AUFS_DEBUG
-+#define AuDbgCntInit(rw) do { \
-+	atomic_set(&(rw)->rcnt, 0); \
-+	atomic_set(&(rw)->wcnt, 0); \
-+	smp_mb(); /* atomic set */ \
-+} while (0)
-+
-+#define AuDbgRcntInc(rw)	atomic_inc(&(rw)->rcnt)
-+#define AuDbgRcntDec(rw)	WARN_ON(atomic_dec_return(&(rw)->rcnt) < 0)
-+#define AuDbgWcntInc(rw)	atomic_inc(&(rw)->wcnt)
-+#define AuDbgWcntDec(rw)	WARN_ON(atomic_dec_return(&(rw)->wcnt) < 0)
-+#else
-+#define AuDbgCntInit(rw)	do {} while (0)
-+#define AuDbgRcntInc(rw)	do {} while (0)
-+#define AuDbgRcntDec(rw)	do {} while (0)
-+#define AuDbgWcntInc(rw)	do {} while (0)
-+#define AuDbgWcntDec(rw)	do {} while (0)
-+#endif /* CONFIG_AUFS_DEBUG */
-+
-+/* to debug easier, do not make them inlined functions */
-+#define AuRwMustNoWaiters(rw)	AuDebugOn(!list_empty(&(rw)->rwsem.wait_list))
-+/* rwsem_is_locked() is unusable */
-+#define AuRwMustReadLock(rw)	AuDebugOn(atomic_read(&(rw)->rcnt) <= 0)
-+#define AuRwMustWriteLock(rw)	AuDebugOn(atomic_read(&(rw)->wcnt) <= 0)
-+#define AuRwMustAnyLock(rw)	AuDebugOn(atomic_read(&(rw)->rcnt) <= 0 \
-+					&& atomic_read(&(rw)->wcnt) <= 0)
-+#define AuRwDestroy(rw)		AuDebugOn(atomic_read(&(rw)->rcnt) \
-+					|| atomic_read(&(rw)->wcnt))
-+
-+#define au_rw_class(rw, key)	lockdep_set_class(&(rw)->rwsem, key)
-+
-+static inline void au_rw_init(struct au_rwsem *rw)
-+{
-+	AuDbgCntInit(rw);
-+	init_rwsem(&rw->rwsem);
-+}
-+
-+static inline void au_rw_init_wlock(struct au_rwsem *rw)
-+{
-+	au_rw_init(rw);
-+	down_write(&rw->rwsem);
-+	AuDbgWcntInc(rw);
-+}
-+
-+static inline void au_rw_init_wlock_nested(struct au_rwsem *rw,
-+					   unsigned int lsc)
-+{
-+	au_rw_init(rw);
-+	down_write_nested(&rw->rwsem, lsc);
-+	AuDbgWcntInc(rw);
-+}
-+
-+static inline void au_rw_read_lock(struct au_rwsem *rw)
-+{
-+	down_read(&rw->rwsem);
-+	AuDbgRcntInc(rw);
-+}
-+
-+static inline void au_rw_read_lock_nested(struct au_rwsem *rw, unsigned int lsc)
-+{
-+	down_read_nested(&rw->rwsem, lsc);
-+	AuDbgRcntInc(rw);
-+}
-+
-+static inline void au_rw_read_unlock(struct au_rwsem *rw)
-+{
-+	AuRwMustReadLock(rw);
-+	AuDbgRcntDec(rw);
-+	up_read(&rw->rwsem);
-+}
-+
-+static inline void au_rw_dgrade_lock(struct au_rwsem *rw)
-+{
-+	AuRwMustWriteLock(rw);
-+	AuDbgRcntInc(rw);
-+	AuDbgWcntDec(rw);
-+	downgrade_write(&rw->rwsem);
-+}
-+
-+static inline void au_rw_write_lock(struct au_rwsem *rw)
-+{
-+	down_write(&rw->rwsem);
-+	AuDbgWcntInc(rw);
-+}
-+
-+static inline void au_rw_write_lock_nested(struct au_rwsem *rw,
-+					   unsigned int lsc)
-+{
-+	down_write_nested(&rw->rwsem, lsc);
-+	AuDbgWcntInc(rw);
-+}
-+
-+static inline void au_rw_write_unlock(struct au_rwsem *rw)
-+{
-+	AuRwMustWriteLock(rw);
-+	AuDbgWcntDec(rw);
-+	up_write(&rw->rwsem);
-+}
-+
-+/* why is not _nested version defined */
-+static inline int au_rw_read_trylock(struct au_rwsem *rw)
-+{
-+	int ret;
-+
-+	ret = down_read_trylock(&rw->rwsem);
-+	if (ret)
-+		AuDbgRcntInc(rw);
-+	return ret;
-+}
-+
-+static inline int au_rw_write_trylock(struct au_rwsem *rw)
-+{
-+	int ret;
-+
-+	ret = down_write_trylock(&rw->rwsem);
-+	if (ret)
-+		AuDbgWcntInc(rw);
-+	return ret;
-+}
-+
-+#undef AuDbgCntInit
-+#undef AuDbgRcntInc
-+#undef AuDbgRcntDec
-+#undef AuDbgWcntInc
-+#undef AuDbgWcntDec
-+
-+#define AuSimpleLockRwsemFuncs(prefix, param, rwsem) \
-+static inline void prefix##_read_lock(param) \
-+{ au_rw_read_lock(rwsem); } \
-+static inline void prefix##_write_lock(param) \
-+{ au_rw_write_lock(rwsem); } \
-+static inline int prefix##_read_trylock(param) \
-+{ return au_rw_read_trylock(rwsem); } \
-+static inline int prefix##_write_trylock(param) \
-+{ return au_rw_write_trylock(rwsem); }
-+/* why is not _nested version defined */
-+/* static inline void prefix##_read_trylock_nested(param, lsc)
-+{ au_rw_read_trylock_nested(rwsem, lsc)); }
-+static inline void prefix##_write_trylock_nestd(param, lsc)
-+{ au_rw_write_trylock_nested(rwsem, lsc); } */
-+
-+#define AuSimpleUnlockRwsemFuncs(prefix, param, rwsem) \
-+static inline void prefix##_read_unlock(param) \
-+{ au_rw_read_unlock(rwsem); } \
-+static inline void prefix##_write_unlock(param) \
-+{ au_rw_write_unlock(rwsem); } \
-+static inline void prefix##_downgrade_lock(param) \
-+{ au_rw_dgrade_lock(rwsem); }
-+
-+#define AuSimpleRwsemFuncs(prefix, param, rwsem) \
-+	AuSimpleLockRwsemFuncs(prefix, param, rwsem) \
-+	AuSimpleUnlockRwsemFuncs(prefix, param, rwsem)
-+
-+#endif /* __KERNEL__ */
-+#endif /* __AUFS_RWSEM_H__ */
-diff -Nur linux-4.1.10.orig/fs/aufs/sbinfo.c linux-4.1.10/fs/aufs/sbinfo.c
---- linux-4.1.10.orig/fs/aufs/sbinfo.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/sbinfo.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,356 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * superblock private data
-+ */
-+
-+#include "aufs.h"
-+
-+/*
-+ * they are necessary regardless sysfs is disabled.
-+ */
-+void au_si_free(struct kobject *kobj)
-+{
-+	int i;
-+	struct au_sbinfo *sbinfo;
-+	char *locked __maybe_unused; /* debug only */
-+
-+	sbinfo = container_of(kobj, struct au_sbinfo, si_kobj);
-+	for (i = 0; i < AuPlink_NHASH; i++)
-+		AuDebugOn(!hlist_empty(&sbinfo->si_plink[i].head));
-+	AuDebugOn(atomic_read(&sbinfo->si_nowait.nw_len));
-+
-+	au_rw_write_lock(&sbinfo->si_rwsem);
-+	au_br_free(sbinfo);
-+	au_rw_write_unlock(&sbinfo->si_rwsem);
-+
-+	AuDebugOn(radix_tree_gang_lookup
-+		  (&sbinfo->au_si_pid.tree, (void **)&locked,
-+		   /*first_index*/PID_MAX_DEFAULT - 1,
-+		   /*max_items*/sizeof(locked)/sizeof(*locked)));
-+
-+	kfree(sbinfo->si_branch);
-+	kfree(sbinfo->au_si_pid.bitmap);
-+	mutex_destroy(&sbinfo->si_xib_mtx);
-+	AuRwDestroy(&sbinfo->si_rwsem);
-+
-+	kfree(sbinfo);
-+}
-+
-+int au_si_alloc(struct super_block *sb)
-+{
-+	int err, i;
-+	struct au_sbinfo *sbinfo;
-+	static struct lock_class_key aufs_si;
-+
-+	err = -ENOMEM;
-+	sbinfo = kzalloc(sizeof(*sbinfo), GFP_NOFS);
-+	if (unlikely(!sbinfo))
-+		goto out;
-+
-+	BUILD_BUG_ON(sizeof(unsigned long) !=
-+		     sizeof(*sbinfo->au_si_pid.bitmap));
-+	sbinfo->au_si_pid.bitmap = kcalloc(BITS_TO_LONGS(PID_MAX_DEFAULT),
-+					sizeof(*sbinfo->au_si_pid.bitmap),
-+					GFP_NOFS);
-+	if (unlikely(!sbinfo->au_si_pid.bitmap))
-+		goto out_sbinfo;
-+
-+	/* will be reallocated separately */
-+	sbinfo->si_branch = kzalloc(sizeof(*sbinfo->si_branch), GFP_NOFS);
-+	if (unlikely(!sbinfo->si_branch))
-+		goto out_pidmap;
-+
-+	err = sysaufs_si_init(sbinfo);
-+	if (unlikely(err))
-+		goto out_br;
-+
-+	au_nwt_init(&sbinfo->si_nowait);
-+	au_rw_init_wlock(&sbinfo->si_rwsem);
-+	au_rw_class(&sbinfo->si_rwsem, &aufs_si);
-+	spin_lock_init(&sbinfo->au_si_pid.tree_lock);
-+	INIT_RADIX_TREE(&sbinfo->au_si_pid.tree, GFP_ATOMIC | __GFP_NOFAIL);
-+
-+	atomic_long_set(&sbinfo->si_ninodes, 0);
-+	atomic_long_set(&sbinfo->si_nfiles, 0);
-+
-+	sbinfo->si_bend = -1;
-+	sbinfo->si_last_br_id = AUFS_BRANCH_MAX / 2;
-+
-+	sbinfo->si_wbr_copyup = AuWbrCopyup_Def;
-+	sbinfo->si_wbr_create = AuWbrCreate_Def;
-+	sbinfo->si_wbr_copyup_ops = au_wbr_copyup_ops + sbinfo->si_wbr_copyup;
-+	sbinfo->si_wbr_create_ops = au_wbr_create_ops + sbinfo->si_wbr_create;
-+
-+	au_fhsm_init(sbinfo);
-+
-+	sbinfo->si_mntflags = au_opts_plink(AuOpt_Def);
-+
-+	sbinfo->si_xino_jiffy = jiffies;
-+	sbinfo->si_xino_expire
-+		= msecs_to_jiffies(AUFS_XINO_DEF_SEC * MSEC_PER_SEC);
-+	mutex_init(&sbinfo->si_xib_mtx);
-+	sbinfo->si_xino_brid = -1;
-+	/* leave si_xib_last_pindex and si_xib_next_bit */
-+
-+	au_sphl_init(&sbinfo->si_aopen);
-+
-+	sbinfo->si_rdcache = msecs_to_jiffies(AUFS_RDCACHE_DEF * MSEC_PER_SEC);
-+	sbinfo->si_rdblk = AUFS_RDBLK_DEF;
-+	sbinfo->si_rdhash = AUFS_RDHASH_DEF;
-+	sbinfo->si_dirwh = AUFS_DIRWH_DEF;
-+
-+	for (i = 0; i < AuPlink_NHASH; i++)
-+		au_sphl_init(sbinfo->si_plink + i);
-+	init_waitqueue_head(&sbinfo->si_plink_wq);
-+	spin_lock_init(&sbinfo->si_plink_maint_lock);
-+
-+	au_sphl_init(&sbinfo->si_files);
-+
-+	/* leave other members for sysaufs and si_mnt. */
-+	sbinfo->si_sb = sb;
-+	sb->s_fs_info = sbinfo;
-+	si_pid_set(sb);
-+	return 0; /* success */
-+
-+out_br:
-+	kfree(sbinfo->si_branch);
-+out_pidmap:
-+	kfree(sbinfo->au_si_pid.bitmap);
-+out_sbinfo:
-+	kfree(sbinfo);
-+out:
-+	return err;
-+}
-+
-+int au_sbr_realloc(struct au_sbinfo *sbinfo, int nbr)
-+{
-+	int err, sz;
-+	struct au_branch **brp;
-+
-+	AuRwMustWriteLock(&sbinfo->si_rwsem);
-+
-+	err = -ENOMEM;
-+	sz = sizeof(*brp) * (sbinfo->si_bend + 1);
-+	if (unlikely(!sz))
-+		sz = sizeof(*brp);
-+	brp = au_kzrealloc(sbinfo->si_branch, sz, sizeof(*brp) * nbr, GFP_NOFS);
-+	if (brp) {
-+		sbinfo->si_branch = brp;
-+		err = 0;
-+	}
-+
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+unsigned int au_sigen_inc(struct super_block *sb)
-+{
-+	unsigned int gen;
-+	struct inode *inode;
-+
-+	SiMustWriteLock(sb);
-+
-+	gen = ++au_sbi(sb)->si_generation;
-+	au_update_digen(sb->s_root);
-+	inode = d_inode(sb->s_root);
-+	au_update_iigen(inode, /*half*/0);
-+	inode->i_version++;
-+	return gen;
-+}
-+
-+aufs_bindex_t au_new_br_id(struct super_block *sb)
-+{
-+	aufs_bindex_t br_id;
-+	int i;
-+	struct au_sbinfo *sbinfo;
-+
-+	SiMustWriteLock(sb);
-+
-+	sbinfo = au_sbi(sb);
-+	for (i = 0; i <= AUFS_BRANCH_MAX; i++) {
-+		br_id = ++sbinfo->si_last_br_id;
-+		AuDebugOn(br_id < 0);
-+		if (br_id && au_br_index(sb, br_id) < 0)
-+			return br_id;
-+	}
-+
-+	return -1;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* it is ok that new 'nwt' tasks are appended while we are sleeping */
-+int si_read_lock(struct super_block *sb, int flags)
-+{
-+	int err;
-+
-+	err = 0;
-+	if (au_ftest_lock(flags, FLUSH))
-+		au_nwt_flush(&au_sbi(sb)->si_nowait);
-+
-+	si_noflush_read_lock(sb);
-+	err = au_plink_maint(sb, flags);
-+	if (unlikely(err))
-+		si_read_unlock(sb);
-+
-+	return err;
-+}
-+
-+int si_write_lock(struct super_block *sb, int flags)
-+{
-+	int err;
-+
-+	if (au_ftest_lock(flags, FLUSH))
-+		au_nwt_flush(&au_sbi(sb)->si_nowait);
-+
-+	si_noflush_write_lock(sb);
-+	err = au_plink_maint(sb, flags);
-+	if (unlikely(err))
-+		si_write_unlock(sb);
-+
-+	return err;
-+}
-+
-+/* dentry and super_block lock. call at entry point */
-+int aufs_read_lock(struct dentry *dentry, int flags)
-+{
-+	int err;
-+	struct super_block *sb;
-+
-+	sb = dentry->d_sb;
-+	err = si_read_lock(sb, flags);
-+	if (unlikely(err))
-+		goto out;
-+
-+	if (au_ftest_lock(flags, DW))
-+		di_write_lock_child(dentry);
-+	else
-+		di_read_lock_child(dentry, flags);
-+
-+	if (au_ftest_lock(flags, GEN)) {
-+		err = au_digen_test(dentry, au_sigen(sb));
-+		AuDebugOn(!err && au_dbrange_test(dentry));
-+		if (unlikely(err))
-+			aufs_read_unlock(dentry, flags);
-+	}
-+
-+out:
-+	return err;
-+}
-+
-+void aufs_read_unlock(struct dentry *dentry, int flags)
-+{
-+	if (au_ftest_lock(flags, DW))
-+		di_write_unlock(dentry);
-+	else
-+		di_read_unlock(dentry, flags);
-+	si_read_unlock(dentry->d_sb);
-+}
-+
-+void aufs_write_lock(struct dentry *dentry)
-+{
-+	si_write_lock(dentry->d_sb, AuLock_FLUSH | AuLock_NOPLMW);
-+	di_write_lock_child(dentry);
-+}
-+
-+void aufs_write_unlock(struct dentry *dentry)
-+{
-+	di_write_unlock(dentry);
-+	si_write_unlock(dentry->d_sb);
-+}
-+
-+int aufs_read_and_write_lock2(struct dentry *d1, struct dentry *d2, int flags)
-+{
-+	int err;
-+	unsigned int sigen;
-+	struct super_block *sb;
-+
-+	sb = d1->d_sb;
-+	err = si_read_lock(sb, flags);
-+	if (unlikely(err))
-+		goto out;
-+
-+	di_write_lock2_child(d1, d2, au_ftest_lock(flags, DIR));
-+
-+	if (au_ftest_lock(flags, GEN)) {
-+		sigen = au_sigen(sb);
-+		err = au_digen_test(d1, sigen);
-+		AuDebugOn(!err && au_dbrange_test(d1));
-+		if (!err) {
-+			err = au_digen_test(d2, sigen);
-+			AuDebugOn(!err && au_dbrange_test(d2));
-+		}
-+		if (unlikely(err))
-+			aufs_read_and_write_unlock2(d1, d2);
-+	}
-+
-+out:
-+	return err;
-+}
-+
-+void aufs_read_and_write_unlock2(struct dentry *d1, struct dentry *d2)
-+{
-+	di_write_unlock2(d1, d2);
-+	si_read_unlock(d1->d_sb);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+int si_pid_test_slow(struct super_block *sb)
-+{
-+	void *p;
-+
-+	rcu_read_lock();
-+	p = radix_tree_lookup(&au_sbi(sb)->au_si_pid.tree, current->pid);
-+	rcu_read_unlock();
-+
-+	return (long)!!p;
-+}
-+
-+void si_pid_set_slow(struct super_block *sb)
-+{
-+	int err;
-+	struct au_sbinfo *sbinfo;
-+
-+	AuDebugOn(si_pid_test_slow(sb));
-+
-+	sbinfo = au_sbi(sb);
-+	err = radix_tree_preload(GFP_NOFS | __GFP_NOFAIL);
-+	AuDebugOn(err);
-+	spin_lock(&sbinfo->au_si_pid.tree_lock);
-+	err = radix_tree_insert(&sbinfo->au_si_pid.tree, current->pid,
-+				/*any valid ptr*/sb);
-+	spin_unlock(&sbinfo->au_si_pid.tree_lock);
-+	AuDebugOn(err);
-+	radix_tree_preload_end();
-+}
-+
-+void si_pid_clr_slow(struct super_block *sb)
-+{
-+	void *p;
-+	struct au_sbinfo *sbinfo;
-+
-+	AuDebugOn(!si_pid_test_slow(sb));
-+
-+	sbinfo = au_sbi(sb);
-+	spin_lock(&sbinfo->au_si_pid.tree_lock);
-+	p = radix_tree_delete(&sbinfo->au_si_pid.tree, current->pid);
-+	spin_unlock(&sbinfo->au_si_pid.tree_lock);
-+}
-diff -Nur linux-4.1.10.orig/fs/aufs/spl.h linux-4.1.10/fs/aufs/spl.h
---- linux-4.1.10.orig/fs/aufs/spl.h	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/spl.h	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,111 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * simple list protected by a spinlock
-+ */
-+
-+#ifndef __AUFS_SPL_H__
-+#define __AUFS_SPL_H__
-+
-+#ifdef __KERNEL__
-+
-+struct au_splhead {
-+	spinlock_t		spin;
-+	struct list_head	head;
-+};
-+
-+static inline void au_spl_init(struct au_splhead *spl)
-+{
-+	spin_lock_init(&spl->spin);
-+	INIT_LIST_HEAD(&spl->head);
-+}
-+
-+static inline void au_spl_add(struct list_head *list, struct au_splhead *spl)
-+{
-+	spin_lock(&spl->spin);
-+	list_add(list, &spl->head);
-+	spin_unlock(&spl->spin);
-+}
-+
-+static inline void au_spl_del(struct list_head *list, struct au_splhead *spl)
-+{
-+	spin_lock(&spl->spin);
-+	list_del(list);
-+	spin_unlock(&spl->spin);
-+}
-+
-+static inline void au_spl_del_rcu(struct list_head *list,
-+				  struct au_splhead *spl)
-+{
-+	spin_lock(&spl->spin);
-+	list_del_rcu(list);
-+	spin_unlock(&spl->spin);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+struct au_sphlhead {
-+	spinlock_t		spin;
-+	struct hlist_head	head;
-+};
-+
-+static inline void au_sphl_init(struct au_sphlhead *sphl)
-+{
-+	spin_lock_init(&sphl->spin);
-+	INIT_HLIST_HEAD(&sphl->head);
-+}
-+
-+static inline void au_sphl_add(struct hlist_node *hlist,
-+			       struct au_sphlhead *sphl)
-+{
-+	spin_lock(&sphl->spin);
-+	hlist_add_head(hlist, &sphl->head);
-+	spin_unlock(&sphl->spin);
-+}
-+
-+static inline void au_sphl_del(struct hlist_node *hlist,
-+			       struct au_sphlhead *sphl)
-+{
-+	spin_lock(&sphl->spin);
-+	hlist_del(hlist);
-+	spin_unlock(&sphl->spin);
-+}
-+
-+static inline void au_sphl_del_rcu(struct hlist_node *hlist,
-+				   struct au_sphlhead *sphl)
-+{
-+	spin_lock(&sphl->spin);
-+	hlist_del_rcu(hlist);
-+	spin_unlock(&sphl->spin);
-+}
-+
-+static inline unsigned long au_sphl_count(struct au_sphlhead *sphl)
-+{
-+	unsigned long cnt;
-+	struct hlist_node *pos;
-+
-+	cnt = 0;
-+	spin_lock(&sphl->spin);
-+	hlist_for_each(pos, &sphl->head)
-+		cnt++;
-+	spin_unlock(&sphl->spin);
-+	return cnt;
-+}
-+
-+#endif /* __KERNEL__ */
-+#endif /* __AUFS_SPL_H__ */
-diff -Nur linux-4.1.10.orig/fs/aufs/super.c linux-4.1.10/fs/aufs/super.c
---- linux-4.1.10.orig/fs/aufs/super.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/super.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,1004 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * mount and super_block operations
-+ */
-+
-+#include <linux/mm.h>
-+#include <linux/seq_file.h>
-+#include <linux/statfs.h>
-+#include <linux/vmalloc.h>
-+#include "aufs.h"
-+
-+/*
-+ * super_operations
-+ */
-+static struct inode *aufs_alloc_inode(struct super_block *sb __maybe_unused)
-+{
-+	struct au_icntnr *c;
-+
-+	c = au_cache_alloc_icntnr();
-+	if (c) {
-+		au_icntnr_init(c);
-+		c->vfs_inode.i_version = 1; /* sigen(sb); */
-+		c->iinfo.ii_hinode = NULL;
-+		return &c->vfs_inode;
-+	}
-+	return NULL;
-+}
-+
-+static void aufs_destroy_inode_cb(struct rcu_head *head)
-+{
-+	struct inode *inode = container_of(head, struct inode, i_rcu);
-+
-+	INIT_HLIST_HEAD(&inode->i_dentry);
-+	au_cache_free_icntnr(container_of(inode, struct au_icntnr, vfs_inode));
-+}
-+
-+static void aufs_destroy_inode(struct inode *inode)
-+{
-+	au_iinfo_fin(inode);
-+	call_rcu(&inode->i_rcu, aufs_destroy_inode_cb);
-+}
-+
-+struct inode *au_iget_locked(struct super_block *sb, ino_t ino)
-+{
-+	struct inode *inode;
-+	int err;
-+
-+	inode = iget_locked(sb, ino);
-+	if (unlikely(!inode)) {
-+		inode = ERR_PTR(-ENOMEM);
-+		goto out;
-+	}
-+	if (!(inode->i_state & I_NEW))
-+		goto out;
-+
-+	err = au_xigen_new(inode);
-+	if (!err)
-+		err = au_iinfo_init(inode);
-+	if (!err)
-+		inode->i_version++;
-+	else {
-+		iget_failed(inode);
-+		inode = ERR_PTR(err);
-+	}
-+
-+out:
-+	/* never return NULL */
-+	AuDebugOn(!inode);
-+	AuTraceErrPtr(inode);
-+	return inode;
-+}
-+
-+/* lock free root dinfo */
-+static int au_show_brs(struct seq_file *seq, struct super_block *sb)
-+{
-+	int err;
-+	aufs_bindex_t bindex, bend;
-+	struct path path;
-+	struct au_hdentry *hdp;
-+	struct au_branch *br;
-+	au_br_perm_str_t perm;
-+
-+	err = 0;
-+	bend = au_sbend(sb);
-+	hdp = au_di(sb->s_root)->di_hdentry;
-+	for (bindex = 0; !err && bindex <= bend; bindex++) {
-+		br = au_sbr(sb, bindex);
-+		path.mnt = au_br_mnt(br);
-+		path.dentry = hdp[bindex].hd_dentry;
-+		err = au_seq_path(seq, &path);
-+		if (!err) {
-+			au_optstr_br_perm(&perm, br->br_perm);
-+			err = seq_printf(seq, "=%s", perm.a);
-+			if (err == -1)
-+				err = -E2BIG;
-+		}
-+		if (!err && bindex != bend)
-+			err = seq_putc(seq, ':');
-+	}
-+
-+	return err;
-+}
-+
-+static void au_show_wbr_create(struct seq_file *m, int v,
-+			       struct au_sbinfo *sbinfo)
-+{
-+	const char *pat;
-+
-+	AuRwMustAnyLock(&sbinfo->si_rwsem);
-+
-+	seq_puts(m, ",create=");
-+	pat = au_optstr_wbr_create(v);
-+	switch (v) {
-+	case AuWbrCreate_TDP:
-+	case AuWbrCreate_RR:
-+	case AuWbrCreate_MFS:
-+	case AuWbrCreate_PMFS:
-+		seq_puts(m, pat);
-+		break;
-+	case AuWbrCreate_MFSV:
-+		seq_printf(m, /*pat*/"mfs:%lu",
-+			   jiffies_to_msecs(sbinfo->si_wbr_mfs.mfs_expire)
-+			   / MSEC_PER_SEC);
-+		break;
-+	case AuWbrCreate_PMFSV:
-+		seq_printf(m, /*pat*/"pmfs:%lu",
-+			   jiffies_to_msecs(sbinfo->si_wbr_mfs.mfs_expire)
-+			   / MSEC_PER_SEC);
-+		break;
-+	case AuWbrCreate_MFSRR:
-+		seq_printf(m, /*pat*/"mfsrr:%llu",
-+			   sbinfo->si_wbr_mfs.mfsrr_watermark);
-+		break;
-+	case AuWbrCreate_MFSRRV:
-+		seq_printf(m, /*pat*/"mfsrr:%llu:%lu",
-+			   sbinfo->si_wbr_mfs.mfsrr_watermark,
-+			   jiffies_to_msecs(sbinfo->si_wbr_mfs.mfs_expire)
-+			   / MSEC_PER_SEC);
-+		break;
-+	case AuWbrCreate_PMFSRR:
-+		seq_printf(m, /*pat*/"pmfsrr:%llu",
-+			   sbinfo->si_wbr_mfs.mfsrr_watermark);
-+		break;
-+	case AuWbrCreate_PMFSRRV:
-+		seq_printf(m, /*pat*/"pmfsrr:%llu:%lu",
-+			   sbinfo->si_wbr_mfs.mfsrr_watermark,
-+			   jiffies_to_msecs(sbinfo->si_wbr_mfs.mfs_expire)
-+			   / MSEC_PER_SEC);
-+		break;
-+	}
-+}
-+
-+static int au_show_xino(struct seq_file *seq, struct super_block *sb)
-+{
-+#ifdef CONFIG_SYSFS
-+	return 0;
-+#else
-+	int err;
-+	const int len = sizeof(AUFS_XINO_FNAME) - 1;
-+	aufs_bindex_t bindex, brid;
-+	struct qstr *name;
-+	struct file *f;
-+	struct dentry *d, *h_root;
-+	struct au_hdentry *hdp;
-+
-+	AuRwMustAnyLock(&sbinfo->si_rwsem);
-+
-+	err = 0;
-+	f = au_sbi(sb)->si_xib;
-+	if (!f)
-+		goto out;
-+
-+	/* stop printing the default xino path on the first writable branch */
-+	h_root = NULL;
-+	brid = au_xino_brid(sb);
-+	if (brid >= 0) {
-+		bindex = au_br_index(sb, brid);
-+		hdp = au_di(sb->s_root)->di_hdentry;
-+		h_root = hdp[0 + bindex].hd_dentry;
-+	}
-+	d = f->f_path.dentry;
-+	name = &d->d_name;
-+	/* safe ->d_parent because the file is unlinked */
-+	if (d->d_parent == h_root
-+	    && name->len == len
-+	    && !memcmp(name->name, AUFS_XINO_FNAME, len))
-+		goto out;
-+
-+	seq_puts(seq, ",xino=");
-+	err = au_xino_path(seq, f);
-+
-+out:
-+	return err;
-+#endif
-+}
-+
-+/* seq_file will re-call me in case of too long string */
-+static int aufs_show_options(struct seq_file *m, struct dentry *dentry)
-+{
-+	int err;
-+	unsigned int mnt_flags, v;
-+	struct super_block *sb;
-+	struct au_sbinfo *sbinfo;
-+
-+#define AuBool(name, str) do { \
-+	v = au_opt_test(mnt_flags, name); \
-+	if (v != au_opt_test(AuOpt_Def, name)) \
-+		seq_printf(m, ",%s" #str, v ? "" : "no"); \
-+} while (0)
-+
-+#define AuStr(name, str) do { \
-+	v = mnt_flags & AuOptMask_##name; \
-+	if (v != (AuOpt_Def & AuOptMask_##name)) \
-+		seq_printf(m, "," #str "=%s", au_optstr_##str(v)); \
-+} while (0)
-+
-+#define AuUInt(name, str, val) do { \
-+	if (val != AUFS_##name##_DEF) \
-+		seq_printf(m, "," #str "=%u", val); \
-+} while (0)
-+
-+	sb = dentry->d_sb;
-+	if (sb->s_flags & MS_POSIXACL)
-+		seq_puts(m, ",acl");
-+
-+	/* lock free root dinfo */
-+	si_noflush_read_lock(sb);
-+	sbinfo = au_sbi(sb);
-+	seq_printf(m, ",si=%lx", sysaufs_si_id(sbinfo));
-+
-+	mnt_flags = au_mntflags(sb);
-+	if (au_opt_test(mnt_flags, XINO)) {
-+		err = au_show_xino(m, sb);
-+		if (unlikely(err))
-+			goto out;
-+	} else
-+		seq_puts(m, ",noxino");
-+
-+	AuBool(TRUNC_XINO, trunc_xino);
-+	AuStr(UDBA, udba);
-+	AuBool(SHWH, shwh);
-+	AuBool(PLINK, plink);
-+	AuBool(DIO, dio);
-+	AuBool(DIRPERM1, dirperm1);
-+
-+	v = sbinfo->si_wbr_create;
-+	if (v != AuWbrCreate_Def)
-+		au_show_wbr_create(m, v, sbinfo);
-+
-+	v = sbinfo->si_wbr_copyup;
-+	if (v != AuWbrCopyup_Def)
-+		seq_printf(m, ",cpup=%s", au_optstr_wbr_copyup(v));
-+
-+	v = au_opt_test(mnt_flags, ALWAYS_DIROPQ);
-+	if (v != au_opt_test(AuOpt_Def, ALWAYS_DIROPQ))
-+		seq_printf(m, ",diropq=%c", v ? 'a' : 'w');
-+
-+	AuUInt(DIRWH, dirwh, sbinfo->si_dirwh);
-+
-+	v = jiffies_to_msecs(sbinfo->si_rdcache) / MSEC_PER_SEC;
-+	AuUInt(RDCACHE, rdcache, v);
-+
-+	AuUInt(RDBLK, rdblk, sbinfo->si_rdblk);
-+	AuUInt(RDHASH, rdhash, sbinfo->si_rdhash);
-+
-+	au_fhsm_show(m, sbinfo);
-+
-+	AuBool(SUM, sum);
-+	/* AuBool(SUM_W, wsum); */
-+	AuBool(WARN_PERM, warn_perm);
-+	AuBool(VERBOSE, verbose);
-+
-+out:
-+	/* be sure to print "br:" last */
-+	if (!sysaufs_brs) {
-+		seq_puts(m, ",br:");
-+		au_show_brs(m, sb);
-+	}
-+	si_read_unlock(sb);
-+	return 0;
-+
-+#undef AuBool
-+#undef AuStr
-+#undef AuUInt
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* sum mode which returns the summation for statfs(2) */
-+
-+static u64 au_add_till_max(u64 a, u64 b)
-+{
-+	u64 old;
-+
-+	old = a;
-+	a += b;
-+	if (old <= a)
-+		return a;
-+	return ULLONG_MAX;
-+}
-+
-+static u64 au_mul_till_max(u64 a, long mul)
-+{
-+	u64 old;
-+
-+	old = a;
-+	a *= mul;
-+	if (old <= a)
-+		return a;
-+	return ULLONG_MAX;
-+}
-+
-+static int au_statfs_sum(struct super_block *sb, struct kstatfs *buf)
-+{
-+	int err;
-+	long bsize, factor;
-+	u64 blocks, bfree, bavail, files, ffree;
-+	aufs_bindex_t bend, bindex, i;
-+	unsigned char shared;
-+	struct path h_path;
-+	struct super_block *h_sb;
-+
-+	err = 0;
-+	bsize = LONG_MAX;
-+	files = 0;
-+	ffree = 0;
-+	blocks = 0;
-+	bfree = 0;
-+	bavail = 0;
-+	bend = au_sbend(sb);
-+	for (bindex = 0; bindex <= bend; bindex++) {
-+		h_path.mnt = au_sbr_mnt(sb, bindex);
-+		h_sb = h_path.mnt->mnt_sb;
-+		shared = 0;
-+		for (i = 0; !shared && i < bindex; i++)
-+			shared = (au_sbr_sb(sb, i) == h_sb);
-+		if (shared)
-+			continue;
-+
-+		/* sb->s_root for NFS is unreliable */
-+		h_path.dentry = h_path.mnt->mnt_root;
-+		err = vfs_statfs(&h_path, buf);
-+		if (unlikely(err))
-+			goto out;
-+
-+		if (bsize > buf->f_bsize) {
-+			/*
-+			 * we will reduce bsize, so we have to expand blocks
-+			 * etc. to match them again
-+			 */
-+			factor = (bsize / buf->f_bsize);
-+			blocks = au_mul_till_max(blocks, factor);
-+			bfree = au_mul_till_max(bfree, factor);
-+			bavail = au_mul_till_max(bavail, factor);
-+			bsize = buf->f_bsize;
-+		}
-+
-+		factor = (buf->f_bsize / bsize);
-+		blocks = au_add_till_max(blocks,
-+				au_mul_till_max(buf->f_blocks, factor));
-+		bfree = au_add_till_max(bfree,
-+				au_mul_till_max(buf->f_bfree, factor));
-+		bavail = au_add_till_max(bavail,
-+				au_mul_till_max(buf->f_bavail, factor));
-+		files = au_add_till_max(files, buf->f_files);
-+		ffree = au_add_till_max(ffree, buf->f_ffree);
-+	}
-+
-+	buf->f_bsize = bsize;
-+	buf->f_blocks = blocks;
-+	buf->f_bfree = bfree;
-+	buf->f_bavail = bavail;
-+	buf->f_files = files;
-+	buf->f_ffree = ffree;
-+	buf->f_frsize = 0;
-+
-+out:
-+	return err;
-+}
-+
-+static int aufs_statfs(struct dentry *dentry, struct kstatfs *buf)
-+{
-+	int err;
-+	struct path h_path;
-+	struct super_block *sb;
-+
-+	/* lock free root dinfo */
-+	sb = dentry->d_sb;
-+	si_noflush_read_lock(sb);
-+	if (!au_opt_test(au_mntflags(sb), SUM)) {
-+		/* sb->s_root for NFS is unreliable */
-+		h_path.mnt = au_sbr_mnt(sb, 0);
-+		h_path.dentry = h_path.mnt->mnt_root;
-+		err = vfs_statfs(&h_path, buf);
-+	} else
-+		err = au_statfs_sum(sb, buf);
-+	si_read_unlock(sb);
-+
-+	if (!err) {
-+		buf->f_type = AUFS_SUPER_MAGIC;
-+		buf->f_namelen = AUFS_MAX_NAMELEN;
-+		memset(&buf->f_fsid, 0, sizeof(buf->f_fsid));
-+	}
-+	/* buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1; */
-+
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static int aufs_sync_fs(struct super_block *sb, int wait)
-+{
-+	int err, e;
-+	aufs_bindex_t bend, bindex;
-+	struct au_branch *br;
-+	struct super_block *h_sb;
-+
-+	err = 0;
-+	si_noflush_read_lock(sb);
-+	bend = au_sbend(sb);
-+	for (bindex = 0; bindex <= bend; bindex++) {
-+		br = au_sbr(sb, bindex);
-+		if (!au_br_writable(br->br_perm))
-+			continue;
-+
-+		h_sb = au_sbr_sb(sb, bindex);
-+		if (h_sb->s_op->sync_fs) {
-+			e = h_sb->s_op->sync_fs(h_sb, wait);
-+			if (unlikely(e && !err))
-+				err = e;
-+			/* go on even if an error happens */
-+		}
-+	}
-+	si_read_unlock(sb);
-+
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* final actions when unmounting a file system */
-+static void aufs_put_super(struct super_block *sb)
-+{
-+	struct au_sbinfo *sbinfo;
-+
-+	sbinfo = au_sbi(sb);
-+	if (!sbinfo)
-+		return;
-+
-+	dbgaufs_si_fin(sbinfo);
-+	kobject_put(&sbinfo->si_kobj);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+void au_array_free(void *array)
-+{
-+	if (array) {
-+		if (!is_vmalloc_addr(array))
-+			kfree(array);
-+		else
-+			vfree(array);
-+	}
-+}
-+
-+void *au_array_alloc(unsigned long long *hint, au_arraycb_t cb, void *arg)
-+{
-+	void *array;
-+	unsigned long long n, sz;
-+
-+	array = NULL;
-+	n = 0;
-+	if (!*hint)
-+		goto out;
-+
-+	if (*hint > ULLONG_MAX / sizeof(array)) {
-+		array = ERR_PTR(-EMFILE);
-+		pr_err("hint %llu\n", *hint);
-+		goto out;
-+	}
-+
-+	sz = sizeof(array) * *hint;
-+	array = kzalloc(sz, GFP_NOFS);
-+	if (unlikely(!array))
-+		array = vzalloc(sz);
-+	if (unlikely(!array)) {
-+		array = ERR_PTR(-ENOMEM);
-+		goto out;
-+	}
-+
-+	n = cb(array, *hint, arg);
-+	AuDebugOn(n > *hint);
-+
-+out:
-+	*hint = n;
-+	return array;
-+}
-+
-+static unsigned long long au_iarray_cb(void *a,
-+				       unsigned long long max __maybe_unused,
-+				       void *arg)
-+{
-+	unsigned long long n;
-+	struct inode **p, *inode;
-+	struct list_head *head;
-+
-+	n = 0;
-+	p = a;
-+	head = arg;
-+	spin_lock(&inode_sb_list_lock);
-+	list_for_each_entry(inode, head, i_sb_list) {
-+		if (!is_bad_inode(inode)
-+		    && au_ii(inode)->ii_bstart >= 0) {
-+			spin_lock(&inode->i_lock);
-+			if (atomic_read(&inode->i_count)) {
-+				au_igrab(inode);
-+				*p++ = inode;
-+				n++;
-+				AuDebugOn(n > max);
-+			}
-+			spin_unlock(&inode->i_lock);
-+		}
-+	}
-+	spin_unlock(&inode_sb_list_lock);
-+
-+	return n;
-+}
-+
-+struct inode **au_iarray_alloc(struct super_block *sb, unsigned long long *max)
-+{
-+	*max = atomic_long_read(&au_sbi(sb)->si_ninodes);
-+	return au_array_alloc(max, au_iarray_cb, &sb->s_inodes);
-+}
-+
-+void au_iarray_free(struct inode **a, unsigned long long max)
-+{
-+	unsigned long long ull;
-+
-+	for (ull = 0; ull < max; ull++)
-+		iput(a[ull]);
-+	au_array_free(a);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/*
-+ * refresh dentry and inode at remount time.
-+ */
-+/* todo: consolidate with simple_reval_dpath() and au_reval_for_attr() */
-+static int au_do_refresh(struct dentry *dentry, unsigned int dir_flags,
-+		      struct dentry *parent)
-+{
-+	int err;
-+
-+	di_write_lock_child(dentry);
-+	di_read_lock_parent(parent, AuLock_IR);
-+	err = au_refresh_dentry(dentry, parent);
-+	if (!err && dir_flags)
-+		au_hn_reset(d_inode(dentry), dir_flags);
-+	di_read_unlock(parent, AuLock_IR);
-+	di_write_unlock(dentry);
-+
-+	return err;
-+}
-+
-+static int au_do_refresh_d(struct dentry *dentry, unsigned int sigen,
-+			   struct au_sbinfo *sbinfo,
-+			   const unsigned int dir_flags)
-+{
-+	int err;
-+	struct dentry *parent;
-+
-+	err = 0;
-+	parent = dget_parent(dentry);
-+	if (!au_digen_test(parent, sigen) && au_digen_test(dentry, sigen)) {
-+		if (d_really_is_positive(dentry)) {
-+			if (!d_is_dir(dentry))
-+				err = au_do_refresh(dentry, /*dir_flags*/0,
-+						 parent);
-+			else {
-+				err = au_do_refresh(dentry, dir_flags, parent);
-+				if (unlikely(err))
-+					au_fset_si(sbinfo, FAILED_REFRESH_DIR);
-+			}
-+		} else
-+			err = au_do_refresh(dentry, /*dir_flags*/0, parent);
-+		AuDbgDentry(dentry);
-+	}
-+	dput(parent);
-+
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+static int au_refresh_d(struct super_block *sb)
-+{
-+	int err, i, j, ndentry, e;
-+	unsigned int sigen;
-+	struct au_dcsub_pages dpages;
-+	struct au_dpage *dpage;
-+	struct dentry **dentries, *d;
-+	struct au_sbinfo *sbinfo;
-+	struct dentry *root = sb->s_root;
-+	const unsigned int dir_flags = au_hi_flags(d_inode(root), /*isdir*/1);
-+
-+	err = au_dpages_init(&dpages, GFP_NOFS);
-+	if (unlikely(err))
-+		goto out;
-+	err = au_dcsub_pages(&dpages, root, NULL, NULL);
-+	if (unlikely(err))
-+		goto out_dpages;
-+
-+	sigen = au_sigen(sb);
-+	sbinfo = au_sbi(sb);
-+	for (i = 0; i < dpages.ndpage; i++) {
-+		dpage = dpages.dpages + i;
-+		dentries = dpage->dentries;
-+		ndentry = dpage->ndentry;
-+		for (j = 0; j < ndentry; j++) {
-+			d = dentries[j];
-+			e = au_do_refresh_d(d, sigen, sbinfo, dir_flags);
-+			if (unlikely(e && !err))
-+				err = e;
-+			/* go on even err */
-+		}
-+	}
-+
-+out_dpages:
-+	au_dpages_free(&dpages);
-+out:
-+	return err;
-+}
-+
-+static int au_refresh_i(struct super_block *sb)
-+{
-+	int err, e;
-+	unsigned int sigen;
-+	unsigned long long max, ull;
-+	struct inode *inode, **array;
-+
-+	array = au_iarray_alloc(sb, &max);
-+	err = PTR_ERR(array);
-+	if (IS_ERR(array))
-+		goto out;
-+
-+	err = 0;
-+	sigen = au_sigen(sb);
-+	for (ull = 0; ull < max; ull++) {
-+		inode = array[ull];
-+		if (unlikely(!inode))
-+			break;
-+		if (au_iigen(inode, NULL) != sigen) {
-+			ii_write_lock_child(inode);
-+			e = au_refresh_hinode_self(inode);
-+			ii_write_unlock(inode);
-+			if (unlikely(e)) {
-+				pr_err("error %d, i%lu\n", e, inode->i_ino);
-+				if (!err)
-+					err = e;
-+				/* go on even if err */
-+			}
-+		}
-+	}
-+
-+	au_iarray_free(array, max);
-+
-+out:
-+	return err;
-+}
-+
-+static void au_remount_refresh(struct super_block *sb)
-+{
-+	int err, e;
-+	unsigned int udba;
-+	aufs_bindex_t bindex, bend;
-+	struct dentry *root;
-+	struct inode *inode;
-+	struct au_branch *br;
-+
-+	au_sigen_inc(sb);
-+	au_fclr_si(au_sbi(sb), FAILED_REFRESH_DIR);
-+
-+	root = sb->s_root;
-+	DiMustNoWaiters(root);
-+	inode = d_inode(root);
-+	IiMustNoWaiters(inode);
-+
-+	udba = au_opt_udba(sb);
-+	bend = au_sbend(sb);
-+	for (bindex = 0; bindex <= bend; bindex++) {
-+		br = au_sbr(sb, bindex);
-+		err = au_hnotify_reset_br(udba, br, br->br_perm);
-+		if (unlikely(err))
-+			AuIOErr("hnotify failed on br %d, %d, ignored\n",
-+				bindex, err);
-+		/* go on even if err */
-+	}
-+	au_hn_reset(inode, au_hi_flags(inode, /*isdir*/1));
-+
-+	di_write_unlock(root);
-+	err = au_refresh_d(sb);
-+	e = au_refresh_i(sb);
-+	if (unlikely(e && !err))
-+		err = e;
-+	/* aufs_write_lock() calls ..._child() */
-+	di_write_lock_child(root);
-+
-+	au_cpup_attr_all(inode, /*force*/1);
-+
-+	if (unlikely(err))
-+		AuIOErr("refresh failed, ignored, %d\n", err);
-+}
-+
-+/* stop extra interpretation of errno in mount(8), and strange error messages */
-+static int cvt_err(int err)
-+{
-+	AuTraceErr(err);
-+
-+	switch (err) {
-+	case -ENOENT:
-+	case -ENOTDIR:
-+	case -EEXIST:
-+	case -EIO:
-+		err = -EINVAL;
-+	}
-+	return err;
-+}
-+
-+static int aufs_remount_fs(struct super_block *sb, int *flags, char *data)
-+{
-+	int err, do_dx;
-+	unsigned int mntflags;
-+	struct au_opts opts;
-+	struct dentry *root;
-+	struct inode *inode;
-+	struct au_sbinfo *sbinfo;
-+
-+	err = 0;
-+	root = sb->s_root;
-+	if (!data || !*data) {
-+		err = si_write_lock(sb, AuLock_FLUSH | AuLock_NOPLM);
-+		if (!err) {
-+			di_write_lock_child(root);
-+			err = au_opts_verify(sb, *flags, /*pending*/0);
-+			aufs_write_unlock(root);
-+		}
-+		goto out;
-+	}
-+
-+	err = -ENOMEM;
-+	memset(&opts, 0, sizeof(opts));
-+	opts.opt = (void *)__get_free_page(GFP_NOFS);
-+	if (unlikely(!opts.opt))
-+		goto out;
-+	opts.max_opt = PAGE_SIZE / sizeof(*opts.opt);
-+	opts.flags = AuOpts_REMOUNT;
-+	opts.sb_flags = *flags;
-+
-+	/* parse it before aufs lock */
-+	err = au_opts_parse(sb, data, &opts);
-+	if (unlikely(err))
-+		goto out_opts;
-+
-+	sbinfo = au_sbi(sb);
-+	inode = d_inode(root);
-+	mutex_lock(&inode->i_mutex);
-+	err = si_write_lock(sb, AuLock_FLUSH | AuLock_NOPLM);
-+	if (unlikely(err))
-+		goto out_mtx;
-+	di_write_lock_child(root);
-+
-+	/* au_opts_remount() may return an error */
-+	err = au_opts_remount(sb, &opts);
-+	au_opts_free(&opts);
-+
-+	if (au_ftest_opts(opts.flags, REFRESH))
-+		au_remount_refresh(sb);
-+
-+	if (au_ftest_opts(opts.flags, REFRESH_DYAOP)) {
-+		mntflags = au_mntflags(sb);
-+		do_dx = !!au_opt_test(mntflags, DIO);
-+		au_dy_arefresh(do_dx);
-+	}
-+
-+	au_fhsm_wrote_all(sb, /*force*/1); /* ?? */
-+	aufs_write_unlock(root);
-+
-+out_mtx:
-+	mutex_unlock(&inode->i_mutex);
-+out_opts:
-+	free_page((unsigned long)opts.opt);
-+out:
-+	err = cvt_err(err);
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+static const struct super_operations aufs_sop = {
-+	.alloc_inode	= aufs_alloc_inode,
-+	.destroy_inode	= aufs_destroy_inode,
-+	/* always deleting, no clearing */
-+	.drop_inode	= generic_delete_inode,
-+	.show_options	= aufs_show_options,
-+	.statfs		= aufs_statfs,
-+	.put_super	= aufs_put_super,
-+	.sync_fs	= aufs_sync_fs,
-+	.remount_fs	= aufs_remount_fs
-+};
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static int alloc_root(struct super_block *sb)
-+{
-+	int err;
-+	struct inode *inode;
-+	struct dentry *root;
-+
-+	err = -ENOMEM;
-+	inode = au_iget_locked(sb, AUFS_ROOT_INO);
-+	err = PTR_ERR(inode);
-+	if (IS_ERR(inode))
-+		goto out;
-+
-+	inode->i_op = &aufs_dir_iop;
-+	inode->i_fop = &aufs_dir_fop;
-+	inode->i_mode = S_IFDIR;
-+	set_nlink(inode, 2);
-+	unlock_new_inode(inode);
-+
-+	root = d_make_root(inode);
-+	if (unlikely(!root))
-+		goto out;
-+	err = PTR_ERR(root);
-+	if (IS_ERR(root))
-+		goto out;
-+
-+	err = au_di_init(root);
-+	if (!err) {
-+		sb->s_root = root;
-+		return 0; /* success */
-+	}
-+	dput(root);
-+
-+out:
-+	return err;
-+}
-+
-+static int aufs_fill_super(struct super_block *sb, void *raw_data,
-+			   int silent __maybe_unused)
-+{
-+	int err;
-+	struct au_opts opts;
-+	struct dentry *root;
-+	struct inode *inode;
-+	char *arg = raw_data;
-+
-+	if (unlikely(!arg || !*arg)) {
-+		err = -EINVAL;
-+		pr_err("no arg\n");
-+		goto out;
-+	}
-+
-+	err = -ENOMEM;
-+	memset(&opts, 0, sizeof(opts));
-+	opts.opt = (void *)__get_free_page(GFP_NOFS);
-+	if (unlikely(!opts.opt))
-+		goto out;
-+	opts.max_opt = PAGE_SIZE / sizeof(*opts.opt);
-+	opts.sb_flags = sb->s_flags;
-+
-+	err = au_si_alloc(sb);
-+	if (unlikely(err))
-+		goto out_opts;
-+
-+	/* all timestamps always follow the ones on the branch */
-+	sb->s_flags |= MS_NOATIME | MS_NODIRATIME;
-+	sb->s_op = &aufs_sop;
-+	sb->s_d_op = &aufs_dop;
-+	sb->s_magic = AUFS_SUPER_MAGIC;
-+	sb->s_maxbytes = 0;
-+	sb->s_stack_depth = 1;
-+	au_export_init(sb);
-+	/* au_xattr_init(sb); */
-+
-+	err = alloc_root(sb);
-+	if (unlikely(err)) {
-+		si_write_unlock(sb);
-+		goto out_info;
-+	}
-+	root = sb->s_root;
-+	inode = d_inode(root);
-+
-+	/*
-+	 * actually we can parse options regardless aufs lock here.
-+	 * but at remount time, parsing must be done before aufs lock.
-+	 * so we follow the same rule.
-+	 */
-+	ii_write_lock_parent(inode);
-+	aufs_write_unlock(root);
-+	err = au_opts_parse(sb, arg, &opts);
-+	if (unlikely(err))
-+		goto out_root;
-+
-+	/* lock vfs_inode first, then aufs. */
-+	mutex_lock(&inode->i_mutex);
-+	aufs_write_lock(root);
-+	err = au_opts_mount(sb, &opts);
-+	au_opts_free(&opts);
-+	aufs_write_unlock(root);
-+	mutex_unlock(&inode->i_mutex);
-+	if (!err)
-+		goto out_opts; /* success */
-+
-+out_root:
-+	dput(root);
-+	sb->s_root = NULL;
-+out_info:
-+	dbgaufs_si_fin(au_sbi(sb));
-+	kobject_put(&au_sbi(sb)->si_kobj);
-+	sb->s_fs_info = NULL;
-+out_opts:
-+	free_page((unsigned long)opts.opt);
-+out:
-+	AuTraceErr(err);
-+	err = cvt_err(err);
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static struct dentry *aufs_mount(struct file_system_type *fs_type, int flags,
-+				 const char *dev_name __maybe_unused,
-+				 void *raw_data)
-+{
-+	struct dentry *root;
-+	struct super_block *sb;
-+
-+	/* all timestamps always follow the ones on the branch */
-+	/* mnt->mnt_flags |= MNT_NOATIME | MNT_NODIRATIME; */
-+	root = mount_nodev(fs_type, flags, raw_data, aufs_fill_super);
-+	if (IS_ERR(root))
-+		goto out;
-+
-+	sb = root->d_sb;
-+	si_write_lock(sb, !AuLock_FLUSH);
-+	sysaufs_brs_add(sb, 0);
-+	si_write_unlock(sb);
-+	au_sbilist_add(sb);
-+
-+out:
-+	return root;
-+}
-+
-+static void aufs_kill_sb(struct super_block *sb)
-+{
-+	struct au_sbinfo *sbinfo;
-+
-+	sbinfo = au_sbi(sb);
-+	if (sbinfo) {
-+		au_sbilist_del(sb);
-+		aufs_write_lock(sb->s_root);
-+		au_fhsm_fin(sb);
-+		if (sbinfo->si_wbr_create_ops->fin)
-+			sbinfo->si_wbr_create_ops->fin(sb);
-+		if (au_opt_test(sbinfo->si_mntflags, UDBA_HNOTIFY)) {
-+			au_opt_set_udba(sbinfo->si_mntflags, UDBA_NONE);
-+			au_remount_refresh(sb);
-+		}
-+		if (au_opt_test(sbinfo->si_mntflags, PLINK))
-+			au_plink_put(sb, /*verbose*/1);
-+		au_xino_clr(sb);
-+		sbinfo->si_sb = NULL;
-+		aufs_write_unlock(sb->s_root);
-+		au_nwt_flush(&sbinfo->si_nowait);
-+	}
-+	kill_anon_super(sb);
-+}
-+
-+struct file_system_type aufs_fs_type = {
-+	.name		= AUFS_FSTYPE,
-+	/* a race between rename and others */
-+	.fs_flags	= FS_RENAME_DOES_D_MOVE,
-+	.mount		= aufs_mount,
-+	.kill_sb	= aufs_kill_sb,
-+	/* no need to __module_get() and module_put(). */
-+	.owner		= THIS_MODULE,
-+};
-diff -Nur linux-4.1.10.orig/fs/aufs/super.h linux-4.1.10/fs/aufs/super.h
---- linux-4.1.10.orig/fs/aufs/super.h	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/super.h	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,635 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * super_block operations
-+ */
-+
-+#ifndef __AUFS_SUPER_H__
-+#define __AUFS_SUPER_H__
-+
-+#ifdef __KERNEL__
-+
-+#include <linux/fs.h>
-+#include <linux/kobject.h>
-+#include "rwsem.h"
-+#include "spl.h"
-+#include "wkq.h"
-+
-+/* policies to select one among multiple writable branches */
-+struct au_wbr_copyup_operations {
-+	int (*copyup)(struct dentry *dentry);
-+};
-+
-+#define AuWbr_DIR	1		/* target is a dir */
-+#define AuWbr_PARENT	(1 << 1)	/* always require a parent */
-+
-+#define au_ftest_wbr(flags, name)	((flags) & AuWbr_##name)
-+#define au_fset_wbr(flags, name)	{ (flags) |= AuWbr_##name; }
-+#define au_fclr_wbr(flags, name)	{ (flags) &= ~AuWbr_##name; }
-+
-+struct au_wbr_create_operations {
-+	int (*create)(struct dentry *dentry, unsigned int flags);
-+	int (*init)(struct super_block *sb);
-+	int (*fin)(struct super_block *sb);
-+};
-+
-+struct au_wbr_mfs {
-+	struct mutex	mfs_lock; /* protect this structure */
-+	unsigned long	mfs_jiffy;
-+	unsigned long	mfs_expire;
-+	aufs_bindex_t	mfs_bindex;
-+
-+	unsigned long long	mfsrr_bytes;
-+	unsigned long long	mfsrr_watermark;
-+};
-+
-+struct pseudo_link {
-+	union {
-+		struct hlist_node hlist;
-+		struct rcu_head rcu;
-+	};
-+	struct inode *inode;
-+};
-+
-+#define AuPlink_NHASH 100
-+static inline int au_plink_hash(ino_t ino)
-+{
-+	return ino % AuPlink_NHASH;
-+}
-+
-+/* File-based Hierarchical Storage Management */
-+struct au_fhsm {
-+#ifdef CONFIG_AUFS_FHSM
-+	/* allow only one process who can receive the notification */
-+	spinlock_t		fhsm_spin;
-+	pid_t			fhsm_pid;
-+	wait_queue_head_t	fhsm_wqh;
-+	atomic_t		fhsm_readable;
-+
-+	/* these are protected by si_rwsem */
-+	unsigned long		fhsm_expire;
-+	aufs_bindex_t		fhsm_bottom;
-+#endif
-+};
-+
-+struct au_branch;
-+struct au_sbinfo {
-+	/* nowait tasks in the system-wide workqueue */
-+	struct au_nowait_tasks	si_nowait;
-+
-+	/*
-+	 * tried sb->s_umount, but failed due to the dependecy between i_mutex.
-+	 * rwsem for au_sbinfo is necessary.
-+	 */
-+	struct au_rwsem		si_rwsem;
-+
-+	/* prevent recursive locking in deleting inode */
-+	struct {
-+		unsigned long		*bitmap;
-+		spinlock_t		tree_lock;
-+		struct radix_tree_root	tree;
-+	} au_si_pid;
-+
-+	/*
-+	 * dirty approach to protect sb->sb_inodes and ->s_files (gone) from
-+	 * remount.
-+	 */
-+	atomic_long_t		si_ninodes, si_nfiles;
-+
-+	/* branch management */
-+	unsigned int		si_generation;
-+
-+	/* see AuSi_ flags */
-+	unsigned char		au_si_status;
-+
-+	aufs_bindex_t		si_bend;
-+
-+	/* dirty trick to keep br_id plus */
-+	unsigned int		si_last_br_id :
-+				sizeof(aufs_bindex_t) * BITS_PER_BYTE - 1;
-+	struct au_branch	**si_branch;
-+
-+	/* policy to select a writable branch */
-+	unsigned char		si_wbr_copyup;
-+	unsigned char		si_wbr_create;
-+	struct au_wbr_copyup_operations *si_wbr_copyup_ops;
-+	struct au_wbr_create_operations *si_wbr_create_ops;
-+
-+	/* round robin */
-+	atomic_t		si_wbr_rr_next;
-+
-+	/* most free space */
-+	struct au_wbr_mfs	si_wbr_mfs;
-+
-+	/* File-based Hierarchical Storage Management */
-+	struct au_fhsm		si_fhsm;
-+
-+	/* mount flags */
-+	/* include/asm-ia64/siginfo.h defines a macro named si_flags */
-+	unsigned int		si_mntflags;
-+
-+	/* external inode number (bitmap and translation table) */
-+	vfs_readf_t		si_xread;
-+	vfs_writef_t		si_xwrite;
-+	struct file		*si_xib;
-+	struct mutex		si_xib_mtx; /* protect xib members */
-+	unsigned long		*si_xib_buf;
-+	unsigned long		si_xib_last_pindex;
-+	int			si_xib_next_bit;
-+	aufs_bindex_t		si_xino_brid;
-+	unsigned long		si_xino_jiffy;
-+	unsigned long		si_xino_expire;
-+	/* reserved for future use */
-+	/* unsigned long long	si_xib_limit; */	/* Max xib file size */
-+
-+#ifdef CONFIG_AUFS_EXPORT
-+	/* i_generation */
-+	struct file		*si_xigen;
-+	atomic_t		si_xigen_next;
-+#endif
-+
-+	/* dirty trick to suppoer atomic_open */
-+	struct au_sphlhead	si_aopen;
-+
-+	/* vdir parameters */
-+	unsigned long		si_rdcache;	/* max cache time in jiffies */
-+	unsigned int		si_rdblk;	/* deblk size */
-+	unsigned int		si_rdhash;	/* hash size */
-+
-+	/*
-+	 * If the number of whiteouts are larger than si_dirwh, leave all of
-+	 * them after au_whtmp_ren to reduce the cost of rmdir(2).
-+	 * future fsck.aufs or kernel thread will remove them later.
-+	 * Otherwise, remove all whiteouts and the dir in rmdir(2).
-+	 */
-+	unsigned int		si_dirwh;
-+
-+	/* pseudo_link list */
-+	struct au_sphlhead	si_plink[AuPlink_NHASH];
-+	wait_queue_head_t	si_plink_wq;
-+	spinlock_t		si_plink_maint_lock;
-+	pid_t			si_plink_maint_pid;
-+
-+	/* file list */
-+	struct au_sphlhead	si_files;
-+
-+	/*
-+	 * sysfs and lifetime management.
-+	 * this is not a small structure and it may be a waste of memory in case
-+	 * of sysfs is disabled, particulary when many aufs-es are mounted.
-+	 * but using sysfs is majority.
-+	 */
-+	struct kobject		si_kobj;
-+#ifdef CONFIG_DEBUG_FS
-+	struct dentry		 *si_dbgaufs;
-+	struct dentry		 *si_dbgaufs_plink;
-+	struct dentry		 *si_dbgaufs_xib;
-+#ifdef CONFIG_AUFS_EXPORT
-+	struct dentry		 *si_dbgaufs_xigen;
-+#endif
-+#endif
-+
-+#ifdef CONFIG_AUFS_SBILIST
-+	struct list_head	si_list;
-+#endif
-+
-+	/* dirty, necessary for unmounting, sysfs and sysrq */
-+	struct super_block	*si_sb;
-+};
-+
-+/* sbinfo status flags */
-+/*
-+ * set true when refresh_dirs() failed at remount time.
-+ * then try refreshing dirs at access time again.
-+ * if it is false, refreshing dirs at access time is unnecesary
-+ */
-+#define AuSi_FAILED_REFRESH_DIR	1
-+
-+#define AuSi_FHSM		(1 << 1)	/* fhsm is active now */
-+
-+#ifndef CONFIG_AUFS_FHSM
-+#undef AuSi_FHSM
-+#define AuSi_FHSM		0
-+#endif
-+
-+static inline unsigned char au_do_ftest_si(struct au_sbinfo *sbi,
-+					   unsigned int flag)
-+{
-+	AuRwMustAnyLock(&sbi->si_rwsem);
-+	return sbi->au_si_status & flag;
-+}
-+#define au_ftest_si(sbinfo, name)	au_do_ftest_si(sbinfo, AuSi_##name)
-+#define au_fset_si(sbinfo, name) do { \
-+	AuRwMustWriteLock(&(sbinfo)->si_rwsem); \
-+	(sbinfo)->au_si_status |= AuSi_##name; \
-+} while (0)
-+#define au_fclr_si(sbinfo, name) do { \
-+	AuRwMustWriteLock(&(sbinfo)->si_rwsem); \
-+	(sbinfo)->au_si_status &= ~AuSi_##name; \
-+} while (0)
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* policy to select one among writable branches */
-+#define AuWbrCopyup(sbinfo, ...) \
-+	((sbinfo)->si_wbr_copyup_ops->copyup(__VA_ARGS__))
-+#define AuWbrCreate(sbinfo, ...) \
-+	((sbinfo)->si_wbr_create_ops->create(__VA_ARGS__))
-+
-+/* flags for si_read_lock()/aufs_read_lock()/di_read_lock() */
-+#define AuLock_DW		1		/* write-lock dentry */
-+#define AuLock_IR		(1 << 1)	/* read-lock inode */
-+#define AuLock_IW		(1 << 2)	/* write-lock inode */
-+#define AuLock_FLUSH		(1 << 3)	/* wait for 'nowait' tasks */
-+#define AuLock_DIR		(1 << 4)	/* target is a dir */
-+#define AuLock_NOPLM		(1 << 5)	/* return err in plm mode */
-+#define AuLock_NOPLMW		(1 << 6)	/* wait for plm mode ends */
-+#define AuLock_GEN		(1 << 7)	/* test digen/iigen */
-+#define au_ftest_lock(flags, name)	((flags) & AuLock_##name)
-+#define au_fset_lock(flags, name) \
-+	do { (flags) |= AuLock_##name; } while (0)
-+#define au_fclr_lock(flags, name) \
-+	do { (flags) &= ~AuLock_##name; } while (0)
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* super.c */
-+extern struct file_system_type aufs_fs_type;
-+struct inode *au_iget_locked(struct super_block *sb, ino_t ino);
-+typedef unsigned long long (*au_arraycb_t)(void *array, unsigned long long max,
-+					   void *arg);
-+void au_array_free(void *array);
-+void *au_array_alloc(unsigned long long *hint, au_arraycb_t cb, void *arg);
-+struct inode **au_iarray_alloc(struct super_block *sb, unsigned long long *max);
-+void au_iarray_free(struct inode **a, unsigned long long max);
-+
-+/* sbinfo.c */
-+void au_si_free(struct kobject *kobj);
-+int au_si_alloc(struct super_block *sb);
-+int au_sbr_realloc(struct au_sbinfo *sbinfo, int nbr);
-+
-+unsigned int au_sigen_inc(struct super_block *sb);
-+aufs_bindex_t au_new_br_id(struct super_block *sb);
-+
-+int si_read_lock(struct super_block *sb, int flags);
-+int si_write_lock(struct super_block *sb, int flags);
-+int aufs_read_lock(struct dentry *dentry, int flags);
-+void aufs_read_unlock(struct dentry *dentry, int flags);
-+void aufs_write_lock(struct dentry *dentry);
-+void aufs_write_unlock(struct dentry *dentry);
-+int aufs_read_and_write_lock2(struct dentry *d1, struct dentry *d2, int flags);
-+void aufs_read_and_write_unlock2(struct dentry *d1, struct dentry *d2);
-+
-+int si_pid_test_slow(struct super_block *sb);
-+void si_pid_set_slow(struct super_block *sb);
-+void si_pid_clr_slow(struct super_block *sb);
-+
-+/* wbr_policy.c */
-+extern struct au_wbr_copyup_operations au_wbr_copyup_ops[];
-+extern struct au_wbr_create_operations au_wbr_create_ops[];
-+int au_cpdown_dirs(struct dentry *dentry, aufs_bindex_t bdst);
-+int au_wbr_nonopq(struct dentry *dentry, aufs_bindex_t bindex);
-+int au_wbr_do_copyup_bu(struct dentry *dentry, aufs_bindex_t bstart);
-+
-+/* mvdown.c */
-+int au_mvdown(struct dentry *dentry, struct aufs_mvdown __user *arg);
-+
-+#ifdef CONFIG_AUFS_FHSM
-+/* fhsm.c */
-+
-+static inline pid_t au_fhsm_pid(struct au_fhsm *fhsm)
-+{
-+	pid_t pid;
-+
-+	spin_lock(&fhsm->fhsm_spin);
-+	pid = fhsm->fhsm_pid;
-+	spin_unlock(&fhsm->fhsm_spin);
-+
-+	return pid;
-+}
-+
-+void au_fhsm_wrote(struct super_block *sb, aufs_bindex_t bindex, int force);
-+void au_fhsm_wrote_all(struct super_block *sb, int force);
-+int au_fhsm_fd(struct super_block *sb, int oflags);
-+int au_fhsm_br_alloc(struct au_branch *br);
-+void au_fhsm_set_bottom(struct super_block *sb, aufs_bindex_t bindex);
-+void au_fhsm_fin(struct super_block *sb);
-+void au_fhsm_init(struct au_sbinfo *sbinfo);
-+void au_fhsm_set(struct au_sbinfo *sbinfo, unsigned int sec);
-+void au_fhsm_show(struct seq_file *seq, struct au_sbinfo *sbinfo);
-+#else
-+AuStubVoid(au_fhsm_wrote, struct super_block *sb, aufs_bindex_t bindex,
-+	   int force)
-+AuStubVoid(au_fhsm_wrote_all, struct super_block *sb, int force)
-+AuStub(int, au_fhsm_fd, return -EOPNOTSUPP, struct super_block *sb, int oflags)
-+AuStub(pid_t, au_fhsm_pid, return 0, struct au_fhsm *fhsm)
-+AuStubInt0(au_fhsm_br_alloc, struct au_branch *br)
-+AuStubVoid(au_fhsm_set_bottom, struct super_block *sb, aufs_bindex_t bindex)
-+AuStubVoid(au_fhsm_fin, struct super_block *sb)
-+AuStubVoid(au_fhsm_init, struct au_sbinfo *sbinfo)
-+AuStubVoid(au_fhsm_set, struct au_sbinfo *sbinfo, unsigned int sec)
-+AuStubVoid(au_fhsm_show, struct seq_file *seq, struct au_sbinfo *sbinfo)
-+#endif
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static inline struct au_sbinfo *au_sbi(struct super_block *sb)
-+{
-+	return sb->s_fs_info;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+#ifdef CONFIG_AUFS_EXPORT
-+int au_test_nfsd(void);
-+void au_export_init(struct super_block *sb);
-+void au_xigen_inc(struct inode *inode);
-+int au_xigen_new(struct inode *inode);
-+int au_xigen_set(struct super_block *sb, struct file *base);
-+void au_xigen_clr(struct super_block *sb);
-+
-+static inline int au_busy_or_stale(void)
-+{
-+	if (!au_test_nfsd())
-+		return -EBUSY;
-+	return -ESTALE;
-+}
-+#else
-+AuStubInt0(au_test_nfsd, void)
-+AuStubVoid(au_export_init, struct super_block *sb)
-+AuStubVoid(au_xigen_inc, struct inode *inode)
-+AuStubInt0(au_xigen_new, struct inode *inode)
-+AuStubInt0(au_xigen_set, struct super_block *sb, struct file *base)
-+AuStubVoid(au_xigen_clr, struct super_block *sb)
-+AuStub(int, au_busy_or_stale, return -EBUSY, void)
-+#endif /* CONFIG_AUFS_EXPORT */
-+
-+/* ---------------------------------------------------------------------- */
-+
-+#ifdef CONFIG_AUFS_SBILIST
-+/* module.c */
-+extern struct au_splhead au_sbilist;
-+
-+static inline void au_sbilist_init(void)
-+{
-+	au_spl_init(&au_sbilist);
-+}
-+
-+static inline void au_sbilist_add(struct super_block *sb)
-+{
-+	au_spl_add(&au_sbi(sb)->si_list, &au_sbilist);
-+}
-+
-+static inline void au_sbilist_del(struct super_block *sb)
-+{
-+	au_spl_del(&au_sbi(sb)->si_list, &au_sbilist);
-+}
-+
-+#ifdef CONFIG_AUFS_MAGIC_SYSRQ
-+static inline void au_sbilist_lock(void)
-+{
-+	spin_lock(&au_sbilist.spin);
-+}
-+
-+static inline void au_sbilist_unlock(void)
-+{
-+	spin_unlock(&au_sbilist.spin);
-+}
-+#define AuGFP_SBILIST	GFP_ATOMIC
-+#else
-+AuStubVoid(au_sbilist_lock, void)
-+AuStubVoid(au_sbilist_unlock, void)
-+#define AuGFP_SBILIST	GFP_NOFS
-+#endif /* CONFIG_AUFS_MAGIC_SYSRQ */
-+#else
-+AuStubVoid(au_sbilist_init, void)
-+AuStubVoid(au_sbilist_add, struct super_block *sb)
-+AuStubVoid(au_sbilist_del, struct super_block *sb)
-+AuStubVoid(au_sbilist_lock, void)
-+AuStubVoid(au_sbilist_unlock, void)
-+#define AuGFP_SBILIST	GFP_NOFS
-+#endif
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static inline void dbgaufs_si_null(struct au_sbinfo *sbinfo)
-+{
-+	/*
-+	 * This function is a dynamic '__init' function actually,
-+	 * so the tiny check for si_rwsem is unnecessary.
-+	 */
-+	/* AuRwMustWriteLock(&sbinfo->si_rwsem); */
-+#ifdef CONFIG_DEBUG_FS
-+	sbinfo->si_dbgaufs = NULL;
-+	sbinfo->si_dbgaufs_plink = NULL;
-+	sbinfo->si_dbgaufs_xib = NULL;
-+#ifdef CONFIG_AUFS_EXPORT
-+	sbinfo->si_dbgaufs_xigen = NULL;
-+#endif
-+#endif
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static inline pid_t si_pid_bit(void)
-+{
-+	/* the origin of pid is 1, but the bitmap's is 0 */
-+	return current->pid - 1;
-+}
-+
-+static inline int si_pid_test(struct super_block *sb)
-+{
-+	pid_t bit;
-+
-+	bit = si_pid_bit();
-+	if (bit < PID_MAX_DEFAULT)
-+		return test_bit(bit, au_sbi(sb)->au_si_pid.bitmap);
-+	return si_pid_test_slow(sb);
-+}
-+
-+static inline void si_pid_set(struct super_block *sb)
-+{
-+	pid_t bit;
-+
-+	bit = si_pid_bit();
-+	if (bit < PID_MAX_DEFAULT) {
-+		AuDebugOn(test_bit(bit, au_sbi(sb)->au_si_pid.bitmap));
-+		set_bit(bit, au_sbi(sb)->au_si_pid.bitmap);
-+		/* smp_mb(); */
-+	} else
-+		si_pid_set_slow(sb);
-+}
-+
-+static inline void si_pid_clr(struct super_block *sb)
-+{
-+	pid_t bit;
-+
-+	bit = si_pid_bit();
-+	if (bit < PID_MAX_DEFAULT) {
-+		AuDebugOn(!test_bit(bit, au_sbi(sb)->au_si_pid.bitmap));
-+		clear_bit(bit, au_sbi(sb)->au_si_pid.bitmap);
-+		/* smp_mb(); */
-+	} else
-+		si_pid_clr_slow(sb);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* lock superblock. mainly for entry point functions */
-+/*
-+ * __si_read_lock, __si_write_lock,
-+ * __si_read_unlock, __si_write_unlock, __si_downgrade_lock
-+ */
-+AuSimpleRwsemFuncs(__si, struct super_block *sb, &au_sbi(sb)->si_rwsem);
-+
-+#define SiMustNoWaiters(sb)	AuRwMustNoWaiters(&au_sbi(sb)->si_rwsem)
-+#define SiMustAnyLock(sb)	AuRwMustAnyLock(&au_sbi(sb)->si_rwsem)
-+#define SiMustWriteLock(sb)	AuRwMustWriteLock(&au_sbi(sb)->si_rwsem)
-+
-+static inline void si_noflush_read_lock(struct super_block *sb)
-+{
-+	__si_read_lock(sb);
-+	si_pid_set(sb);
-+}
-+
-+static inline int si_noflush_read_trylock(struct super_block *sb)
-+{
-+	int locked;
-+
-+	locked = __si_read_trylock(sb);
-+	if (locked)
-+		si_pid_set(sb);
-+	return locked;
-+}
-+
-+static inline void si_noflush_write_lock(struct super_block *sb)
-+{
-+	__si_write_lock(sb);
-+	si_pid_set(sb);
-+}
-+
-+static inline int si_noflush_write_trylock(struct super_block *sb)
-+{
-+	int locked;
-+
-+	locked = __si_write_trylock(sb);
-+	if (locked)
-+		si_pid_set(sb);
-+	return locked;
-+}
-+
-+#if 0 /* reserved */
-+static inline int si_read_trylock(struct super_block *sb, int flags)
-+{
-+	if (au_ftest_lock(flags, FLUSH))
-+		au_nwt_flush(&au_sbi(sb)->si_nowait);
-+	return si_noflush_read_trylock(sb);
-+}
-+#endif
-+
-+static inline void si_read_unlock(struct super_block *sb)
-+{
-+	si_pid_clr(sb);
-+	__si_read_unlock(sb);
-+}
-+
-+#if 0 /* reserved */
-+static inline int si_write_trylock(struct super_block *sb, int flags)
-+{
-+	if (au_ftest_lock(flags, FLUSH))
-+		au_nwt_flush(&au_sbi(sb)->si_nowait);
-+	return si_noflush_write_trylock(sb);
-+}
-+#endif
-+
-+static inline void si_write_unlock(struct super_block *sb)
-+{
-+	si_pid_clr(sb);
-+	__si_write_unlock(sb);
-+}
-+
-+#if 0 /* reserved */
-+static inline void si_downgrade_lock(struct super_block *sb)
-+{
-+	__si_downgrade_lock(sb);
-+}
-+#endif
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static inline aufs_bindex_t au_sbend(struct super_block *sb)
-+{
-+	SiMustAnyLock(sb);
-+	return au_sbi(sb)->si_bend;
-+}
-+
-+static inline unsigned int au_mntflags(struct super_block *sb)
-+{
-+	SiMustAnyLock(sb);
-+	return au_sbi(sb)->si_mntflags;
-+}
-+
-+static inline unsigned int au_sigen(struct super_block *sb)
-+{
-+	SiMustAnyLock(sb);
-+	return au_sbi(sb)->si_generation;
-+}
-+
-+static inline void au_ninodes_inc(struct super_block *sb)
-+{
-+	atomic_long_inc(&au_sbi(sb)->si_ninodes);
-+}
-+
-+static inline void au_ninodes_dec(struct super_block *sb)
-+{
-+	AuDebugOn(!atomic_long_read(&au_sbi(sb)->si_ninodes));
-+	atomic_long_dec(&au_sbi(sb)->si_ninodes);
-+}
-+
-+static inline void au_nfiles_inc(struct super_block *sb)
-+{
-+	atomic_long_inc(&au_sbi(sb)->si_nfiles);
-+}
-+
-+static inline void au_nfiles_dec(struct super_block *sb)
-+{
-+	AuDebugOn(!atomic_long_read(&au_sbi(sb)->si_nfiles));
-+	atomic_long_dec(&au_sbi(sb)->si_nfiles);
-+}
-+
-+static inline struct au_branch *au_sbr(struct super_block *sb,
-+				       aufs_bindex_t bindex)
-+{
-+	SiMustAnyLock(sb);
-+	return au_sbi(sb)->si_branch[0 + bindex];
-+}
-+
-+static inline void au_xino_brid_set(struct super_block *sb, aufs_bindex_t brid)
-+{
-+	SiMustWriteLock(sb);
-+	au_sbi(sb)->si_xino_brid = brid;
-+}
-+
-+static inline aufs_bindex_t au_xino_brid(struct super_block *sb)
-+{
-+	SiMustAnyLock(sb);
-+	return au_sbi(sb)->si_xino_brid;
-+}
-+
-+#endif /* __KERNEL__ */
-+#endif /* __AUFS_SUPER_H__ */
-diff -Nur linux-4.1.10.orig/fs/aufs/sysaufs.c linux-4.1.10/fs/aufs/sysaufs.c
---- linux-4.1.10.orig/fs/aufs/sysaufs.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/sysaufs.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,104 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * sysfs interface and lifetime management
-+ * they are necessary regardless sysfs is disabled.
-+ */
-+
-+#include <linux/random.h>
-+#include "aufs.h"
-+
-+unsigned long sysaufs_si_mask;
-+struct kset *sysaufs_kset;
-+
-+#define AuSiAttr(_name) { \
-+	.attr   = { .name = __stringify(_name), .mode = 0444 },	\
-+	.show   = sysaufs_si_##_name,				\
-+}
-+
-+static struct sysaufs_si_attr sysaufs_si_attr_xi_path = AuSiAttr(xi_path);
-+struct attribute *sysaufs_si_attrs[] = {
-+	&sysaufs_si_attr_xi_path.attr,
-+	NULL,
-+};
-+
-+static const struct sysfs_ops au_sbi_ops = {
-+	.show   = sysaufs_si_show
-+};
-+
-+static struct kobj_type au_sbi_ktype = {
-+	.release	= au_si_free,
-+	.sysfs_ops	= &au_sbi_ops,
-+	.default_attrs	= sysaufs_si_attrs
-+};
-+
-+/* ---------------------------------------------------------------------- */
-+
-+int sysaufs_si_init(struct au_sbinfo *sbinfo)
-+{
-+	int err;
-+
-+	sbinfo->si_kobj.kset = sysaufs_kset;
-+	/* cf. sysaufs_name() */
-+	err = kobject_init_and_add
-+		(&sbinfo->si_kobj, &au_sbi_ktype, /*&sysaufs_kset->kobj*/NULL,
-+		 SysaufsSiNamePrefix "%lx", sysaufs_si_id(sbinfo));
-+
-+	dbgaufs_si_null(sbinfo);
-+	if (!err) {
-+		err = dbgaufs_si_init(sbinfo);
-+		if (unlikely(err))
-+			kobject_put(&sbinfo->si_kobj);
-+	}
-+	return err;
-+}
-+
-+void sysaufs_fin(void)
-+{
-+	dbgaufs_fin();
-+	sysfs_remove_group(&sysaufs_kset->kobj, sysaufs_attr_group);
-+	kset_unregister(sysaufs_kset);
-+}
-+
-+int __init sysaufs_init(void)
-+{
-+	int err;
-+
-+	do {
-+		get_random_bytes(&sysaufs_si_mask, sizeof(sysaufs_si_mask));
-+	} while (!sysaufs_si_mask);
-+
-+	err = -EINVAL;
-+	sysaufs_kset = kset_create_and_add(AUFS_NAME, NULL, fs_kobj);
-+	if (unlikely(!sysaufs_kset))
-+		goto out;
-+	err = PTR_ERR(sysaufs_kset);
-+	if (IS_ERR(sysaufs_kset))
-+		goto out;
-+	err = sysfs_create_group(&sysaufs_kset->kobj, sysaufs_attr_group);
-+	if (unlikely(err)) {
-+		kset_unregister(sysaufs_kset);
-+		goto out;
-+	}
-+
-+	err = dbgaufs_init();
-+	if (unlikely(err))
-+		sysaufs_fin();
-+out:
-+	return err;
-+}
-diff -Nur linux-4.1.10.orig/fs/aufs/sysaufs.h linux-4.1.10/fs/aufs/sysaufs.h
---- linux-4.1.10.orig/fs/aufs/sysaufs.h	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/sysaufs.h	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,101 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * sysfs interface and mount lifetime management
-+ */
-+
-+#ifndef __SYSAUFS_H__
-+#define __SYSAUFS_H__
-+
-+#ifdef __KERNEL__
-+
-+#include <linux/sysfs.h>
-+#include "module.h"
-+
-+struct super_block;
-+struct au_sbinfo;
-+
-+struct sysaufs_si_attr {
-+	struct attribute attr;
-+	int (*show)(struct seq_file *seq, struct super_block *sb);
-+};
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* sysaufs.c */
-+extern unsigned long sysaufs_si_mask;
-+extern struct kset *sysaufs_kset;
-+extern struct attribute *sysaufs_si_attrs[];
-+int sysaufs_si_init(struct au_sbinfo *sbinfo);
-+int __init sysaufs_init(void);
-+void sysaufs_fin(void);
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* some people doesn't like to show a pointer in kernel */
-+static inline unsigned long sysaufs_si_id(struct au_sbinfo *sbinfo)
-+{
-+	return sysaufs_si_mask ^ (unsigned long)sbinfo;
-+}
-+
-+#define SysaufsSiNamePrefix	"si_"
-+#define SysaufsSiNameLen	(sizeof(SysaufsSiNamePrefix) + 16)
-+static inline void sysaufs_name(struct au_sbinfo *sbinfo, char *name)
-+{
-+	snprintf(name, SysaufsSiNameLen, SysaufsSiNamePrefix "%lx",
-+		 sysaufs_si_id(sbinfo));
-+}
-+
-+struct au_branch;
-+#ifdef CONFIG_SYSFS
-+/* sysfs.c */
-+extern struct attribute_group *sysaufs_attr_group;
-+
-+int sysaufs_si_xi_path(struct seq_file *seq, struct super_block *sb);
-+ssize_t sysaufs_si_show(struct kobject *kobj, struct attribute *attr,
-+			 char *buf);
-+long au_brinfo_ioctl(struct file *file, unsigned long arg);
-+#ifdef CONFIG_COMPAT
-+long au_brinfo_compat_ioctl(struct file *file, unsigned long arg);
-+#endif
-+
-+void sysaufs_br_init(struct au_branch *br);
-+void sysaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex);
-+void sysaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex);
-+
-+#define sysaufs_brs_init()	do {} while (0)
-+
-+#else
-+#define sysaufs_attr_group	NULL
-+
-+AuStubInt0(sysaufs_si_xi_path, struct seq_file *seq, struct super_block *sb)
-+AuStub(ssize_t, sysaufs_si_show, return 0, struct kobject *kobj,
-+       struct attribute *attr, char *buf)
-+AuStubVoid(sysaufs_br_init, struct au_branch *br)
-+AuStubVoid(sysaufs_brs_add, struct super_block *sb, aufs_bindex_t bindex)
-+AuStubVoid(sysaufs_brs_del, struct super_block *sb, aufs_bindex_t bindex)
-+
-+static inline void sysaufs_brs_init(void)
-+{
-+	sysaufs_brs = 0;
-+}
-+
-+#endif /* CONFIG_SYSFS */
-+
-+#endif /* __KERNEL__ */
-+#endif /* __SYSAUFS_H__ */
-diff -Nur linux-4.1.10.orig/fs/aufs/sysfs.c linux-4.1.10/fs/aufs/sysfs.c
---- linux-4.1.10.orig/fs/aufs/sysfs.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/sysfs.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,376 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * sysfs interface
-+ */
-+
-+#include <linux/compat.h>
-+#include <linux/seq_file.h>
-+#include "aufs.h"
-+
-+#ifdef CONFIG_AUFS_FS_MODULE
-+/* this entry violates the "one line per file" policy of sysfs */
-+static ssize_t config_show(struct kobject *kobj, struct kobj_attribute *attr,
-+			   char *buf)
-+{
-+	ssize_t err;
-+	static char *conf =
-+/* this file is generated at compiling */
-+#include "conf.str"
-+		;
-+
-+	err = snprintf(buf, PAGE_SIZE, conf);
-+	if (unlikely(err >= PAGE_SIZE))
-+		err = -EFBIG;
-+	return err;
-+}
-+
-+static struct kobj_attribute au_config_attr = __ATTR_RO(config);
-+#endif
-+
-+static struct attribute *au_attr[] = {
-+#ifdef CONFIG_AUFS_FS_MODULE
-+	&au_config_attr.attr,
-+#endif
-+	NULL,	/* need to NULL terminate the list of attributes */
-+};
-+
-+static struct attribute_group sysaufs_attr_group_body = {
-+	.attrs = au_attr
-+};
-+
-+struct attribute_group *sysaufs_attr_group = &sysaufs_attr_group_body;
-+
-+/* ---------------------------------------------------------------------- */
-+
-+int sysaufs_si_xi_path(struct seq_file *seq, struct super_block *sb)
-+{
-+	int err;
-+
-+	SiMustAnyLock(sb);
-+
-+	err = 0;
-+	if (au_opt_test(au_mntflags(sb), XINO)) {
-+		err = au_xino_path(seq, au_sbi(sb)->si_xib);
-+		seq_putc(seq, '\n');
-+	}
-+	return err;
-+}
-+
-+/*
-+ * the lifetime of branch is independent from the entry under sysfs.
-+ * sysfs handles the lifetime of the entry, and never call ->show() after it is
-+ * unlinked.
-+ */
-+static int sysaufs_si_br(struct seq_file *seq, struct super_block *sb,
-+			 aufs_bindex_t bindex, int idx)
-+{
-+	int err;
-+	struct path path;
-+	struct dentry *root;
-+	struct au_branch *br;
-+	au_br_perm_str_t perm;
-+
-+	AuDbg("b%d\n", bindex);
-+
-+	err = 0;
-+	root = sb->s_root;
-+	di_read_lock_parent(root, !AuLock_IR);
-+	br = au_sbr(sb, bindex);
-+
-+	switch (idx) {
-+	case AuBrSysfs_BR:
-+		path.mnt = au_br_mnt(br);
-+		path.dentry = au_h_dptr(root, bindex);
-+		err = au_seq_path(seq, &path);
-+		if (!err) {
-+			au_optstr_br_perm(&perm, br->br_perm);
-+			err = seq_printf(seq, "=%s\n", perm.a);
-+		}
-+		break;
-+	case AuBrSysfs_BRID:
-+		err = seq_printf(seq, "%d\n", br->br_id);
-+		break;
-+	}
-+	di_read_unlock(root, !AuLock_IR);
-+	if (err == -1)
-+		err = -E2BIG;
-+
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static struct seq_file *au_seq(char *p, ssize_t len)
-+{
-+	struct seq_file *seq;
-+
-+	seq = kzalloc(sizeof(*seq), GFP_NOFS);
-+	if (seq) {
-+		/* mutex_init(&seq.lock); */
-+		seq->buf = p;
-+		seq->size = len;
-+		return seq; /* success */
-+	}
-+
-+	seq = ERR_PTR(-ENOMEM);
-+	return seq;
-+}
-+
-+#define SysaufsBr_PREFIX	"br"
-+#define SysaufsBrid_PREFIX	"brid"
-+
-+/* todo: file size may exceed PAGE_SIZE */
-+ssize_t sysaufs_si_show(struct kobject *kobj, struct attribute *attr,
-+			char *buf)
-+{
-+	ssize_t err;
-+	int idx;
-+	long l;
-+	aufs_bindex_t bend;
-+	struct au_sbinfo *sbinfo;
-+	struct super_block *sb;
-+	struct seq_file *seq;
-+	char *name;
-+	struct attribute **cattr;
-+
-+	sbinfo = container_of(kobj, struct au_sbinfo, si_kobj);
-+	sb = sbinfo->si_sb;
-+
-+	/*
-+	 * prevent a race condition between sysfs and aufs.
-+	 * for instance, sysfs_file_read() calls sysfs_get_active_two() which
-+	 * prohibits maintaining the sysfs entries.
-+	 * hew we acquire read lock after sysfs_get_active_two().
-+	 * on the other hand, the remount process may maintain the sysfs/aufs
-+	 * entries after acquiring write lock.
-+	 * it can cause a deadlock.
-+	 * simply we gave up processing read here.
-+	 */
-+	err = -EBUSY;
-+	if (unlikely(!si_noflush_read_trylock(sb)))
-+		goto out;
-+
-+	seq = au_seq(buf, PAGE_SIZE);
-+	err = PTR_ERR(seq);
-+	if (IS_ERR(seq))
-+		goto out_unlock;
-+
-+	name = (void *)attr->name;
-+	cattr = sysaufs_si_attrs;
-+	while (*cattr) {
-+		if (!strcmp(name, (*cattr)->name)) {
-+			err = container_of(*cattr, struct sysaufs_si_attr, attr)
-+				->show(seq, sb);
-+			goto out_seq;
-+		}
-+		cattr++;
-+	}
-+
-+	if (!strncmp(name, SysaufsBrid_PREFIX,
-+		     sizeof(SysaufsBrid_PREFIX) - 1)) {
-+		idx = AuBrSysfs_BRID;
-+		name += sizeof(SysaufsBrid_PREFIX) - 1;
-+	} else if (!strncmp(name, SysaufsBr_PREFIX,
-+			    sizeof(SysaufsBr_PREFIX) - 1)) {
-+		idx = AuBrSysfs_BR;
-+		name += sizeof(SysaufsBr_PREFIX) - 1;
-+	} else
-+		  BUG();
-+
-+	err = kstrtol(name, 10, &l);
-+	if (!err) {
-+		bend = au_sbend(sb);
-+		if (l <= bend)
-+			err = sysaufs_si_br(seq, sb, (aufs_bindex_t)l, idx);
-+		else
-+			err = -ENOENT;
-+	}
-+
-+out_seq:
-+	if (!err) {
-+		err = seq->count;
-+		/* sysfs limit */
-+		if (unlikely(err == PAGE_SIZE))
-+			err = -EFBIG;
-+	}
-+	kfree(seq);
-+out_unlock:
-+	si_read_unlock(sb);
-+out:
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static int au_brinfo(struct super_block *sb, union aufs_brinfo __user *arg)
-+{
-+	int err;
-+	int16_t brid;
-+	aufs_bindex_t bindex, bend;
-+	size_t sz;
-+	char *buf;
-+	struct seq_file *seq;
-+	struct au_branch *br;
-+
-+	si_read_lock(sb, AuLock_FLUSH);
-+	bend = au_sbend(sb);
-+	err = bend + 1;
-+	if (!arg)
-+		goto out;
-+
-+	err = -ENOMEM;
-+	buf = (void *)__get_free_page(GFP_NOFS);
-+	if (unlikely(!buf))
-+		goto out;
-+
-+	seq = au_seq(buf, PAGE_SIZE);
-+	err = PTR_ERR(seq);
-+	if (IS_ERR(seq))
-+		goto out_buf;
-+
-+	sz = sizeof(*arg) - offsetof(union aufs_brinfo, path);
-+	for (bindex = 0; bindex <= bend; bindex++, arg++) {
-+		err = !access_ok(VERIFY_WRITE, arg, sizeof(*arg));
-+		if (unlikely(err))
-+			break;
-+
-+		br = au_sbr(sb, bindex);
-+		brid = br->br_id;
-+		BUILD_BUG_ON(sizeof(brid) != sizeof(arg->id));
-+		err = __put_user(brid, &arg->id);
-+		if (unlikely(err))
-+			break;
-+
-+		BUILD_BUG_ON(sizeof(br->br_perm) != sizeof(arg->perm));
-+		err = __put_user(br->br_perm, &arg->perm);
-+		if (unlikely(err))
-+			break;
-+
-+		err = au_seq_path(seq, &br->br_path);
-+		if (unlikely(err))
-+			break;
-+		err = seq_putc(seq, '\0');
-+		if (!err && seq->count <= sz) {
-+			err = copy_to_user(arg->path, seq->buf, seq->count);
-+			seq->count = 0;
-+			if (unlikely(err))
-+				break;
-+		} else {
-+			err = -E2BIG;
-+			goto out_seq;
-+		}
-+	}
-+	if (unlikely(err))
-+		err = -EFAULT;
-+
-+out_seq:
-+	kfree(seq);
-+out_buf:
-+	free_page((unsigned long)buf);
-+out:
-+	si_read_unlock(sb);
-+	return err;
-+}
-+
-+long au_brinfo_ioctl(struct file *file, unsigned long arg)
-+{
-+	return au_brinfo(file->f_path.dentry->d_sb, (void __user *)arg);
-+}
-+
-+#ifdef CONFIG_COMPAT
-+long au_brinfo_compat_ioctl(struct file *file, unsigned long arg)
-+{
-+	return au_brinfo(file->f_path.dentry->d_sb, compat_ptr(arg));
-+}
-+#endif
-+
-+/* ---------------------------------------------------------------------- */
-+
-+void sysaufs_br_init(struct au_branch *br)
-+{
-+	int i;
-+	struct au_brsysfs *br_sysfs;
-+	struct attribute *attr;
-+
-+	br_sysfs = br->br_sysfs;
-+	for (i = 0; i < ARRAY_SIZE(br->br_sysfs); i++) {
-+		attr = &br_sysfs->attr;
-+		sysfs_attr_init(attr);
-+		attr->name = br_sysfs->name;
-+		attr->mode = S_IRUGO;
-+		br_sysfs++;
-+	}
-+}
-+
-+void sysaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex)
-+{
-+	struct au_branch *br;
-+	struct kobject *kobj;
-+	struct au_brsysfs *br_sysfs;
-+	int i;
-+	aufs_bindex_t bend;
-+
-+	dbgaufs_brs_del(sb, bindex);
-+
-+	if (!sysaufs_brs)
-+		return;
-+
-+	kobj = &au_sbi(sb)->si_kobj;
-+	bend = au_sbend(sb);
-+	for (; bindex <= bend; bindex++) {
-+		br = au_sbr(sb, bindex);
-+		br_sysfs = br->br_sysfs;
-+		for (i = 0; i < ARRAY_SIZE(br->br_sysfs); i++) {
-+			sysfs_remove_file(kobj, &br_sysfs->attr);
-+			br_sysfs++;
-+		}
-+	}
-+}
-+
-+void sysaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex)
-+{
-+	int err, i;
-+	aufs_bindex_t bend;
-+	struct kobject *kobj;
-+	struct au_branch *br;
-+	struct au_brsysfs *br_sysfs;
-+
-+	dbgaufs_brs_add(sb, bindex);
-+
-+	if (!sysaufs_brs)
-+		return;
-+
-+	kobj = &au_sbi(sb)->si_kobj;
-+	bend = au_sbend(sb);
-+	for (; bindex <= bend; bindex++) {
-+		br = au_sbr(sb, bindex);
-+		br_sysfs = br->br_sysfs;
-+		snprintf(br_sysfs[AuBrSysfs_BR].name, sizeof(br_sysfs->name),
-+			 SysaufsBr_PREFIX "%d", bindex);
-+		snprintf(br_sysfs[AuBrSysfs_BRID].name, sizeof(br_sysfs->name),
-+			 SysaufsBrid_PREFIX "%d", bindex);
-+		for (i = 0; i < ARRAY_SIZE(br->br_sysfs); i++) {
-+			err = sysfs_create_file(kobj, &br_sysfs->attr);
-+			if (unlikely(err))
-+				pr_warn("failed %s under sysfs(%d)\n",
-+					br_sysfs->name, err);
-+			br_sysfs++;
-+		}
-+	}
-+}
-diff -Nur linux-4.1.10.orig/fs/aufs/sysrq.c linux-4.1.10/fs/aufs/sysrq.c
---- linux-4.1.10.orig/fs/aufs/sysrq.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/sysrq.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,157 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * magic sysrq hanlder
-+ */
-+
-+/* #include <linux/sysrq.h> */
-+#include <linux/writeback.h>
-+#include "aufs.h"
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static void sysrq_sb(struct super_block *sb)
-+{
-+	char *plevel;
-+	struct au_sbinfo *sbinfo;
-+	struct file *file;
-+	struct au_sphlhead *files;
-+	struct au_finfo *finfo;
-+
-+	plevel = au_plevel;
-+	au_plevel = KERN_WARNING;
-+
-+	/* since we define pr_fmt, call printk directly */
-+#define pr(str) printk(KERN_WARNING AUFS_NAME ": " str)
-+
-+	sbinfo = au_sbi(sb);
-+	printk(KERN_WARNING "si=%lx\n", sysaufs_si_id(sbinfo));
-+	pr("superblock\n");
-+	au_dpri_sb(sb);
-+
-+#if 0
-+	pr("root dentry\n");
-+	au_dpri_dentry(sb->s_root);
-+	pr("root inode\n");
-+	au_dpri_inode(d_inode(sb->s_root));
-+#endif
-+
-+#if 0
-+	do {
-+		int err, i, j, ndentry;
-+		struct au_dcsub_pages dpages;
-+		struct au_dpage *dpage;
-+
-+		err = au_dpages_init(&dpages, GFP_ATOMIC);
-+		if (unlikely(err))
-+			break;
-+		err = au_dcsub_pages(&dpages, sb->s_root, NULL, NULL);
-+		if (!err)
-+			for (i = 0; i < dpages.ndpage; i++) {
-+				dpage = dpages.dpages + i;
-+				ndentry = dpage->ndentry;
-+				for (j = 0; j < ndentry; j++)
-+					au_dpri_dentry(dpage->dentries[j]);
-+			}
-+		au_dpages_free(&dpages);
-+	} while (0);
-+#endif
-+
-+#if 1
-+	{
-+		struct inode *i;
-+
-+		pr("isolated inode\n");
-+		spin_lock(&inode_sb_list_lock);
-+		list_for_each_entry(i, &sb->s_inodes, i_sb_list) {
-+			spin_lock(&i->i_lock);
-+			if (1 || hlist_empty(&i->i_dentry))
-+				au_dpri_inode(i);
-+			spin_unlock(&i->i_lock);
-+		}
-+		spin_unlock(&inode_sb_list_lock);
-+	}
-+#endif
-+	pr("files\n");
-+	files = &au_sbi(sb)->si_files;
-+	spin_lock(&files->spin);
-+	hlist_for_each_entry(finfo, &files->head, fi_hlist) {
-+		umode_t mode;
-+
-+		file = finfo->fi_file;
-+		mode = file_inode(file)->i_mode;
-+		if (!special_file(mode))
-+			au_dpri_file(file);
-+	}
-+	spin_unlock(&files->spin);
-+	pr("done\n");
-+
-+#undef pr
-+	au_plevel = plevel;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* module parameter */
-+static char *aufs_sysrq_key = "a";
-+module_param_named(sysrq, aufs_sysrq_key, charp, S_IRUGO);
-+MODULE_PARM_DESC(sysrq, "MagicSysRq key for " AUFS_NAME);
-+
-+static void au_sysrq(int key __maybe_unused)
-+{
-+	struct au_sbinfo *sbinfo;
-+
-+	lockdep_off();
-+	au_sbilist_lock();
-+	list_for_each_entry(sbinfo, &au_sbilist.head, si_list)
-+		sysrq_sb(sbinfo->si_sb);
-+	au_sbilist_unlock();
-+	lockdep_on();
-+}
-+
-+static struct sysrq_key_op au_sysrq_op = {
-+	.handler	= au_sysrq,
-+	.help_msg	= "Aufs",
-+	.action_msg	= "Aufs",
-+	.enable_mask	= SYSRQ_ENABLE_DUMP
-+};
-+
-+/* ---------------------------------------------------------------------- */
-+
-+int __init au_sysrq_init(void)
-+{
-+	int err;
-+	char key;
-+
-+	err = -1;
-+	key = *aufs_sysrq_key;
-+	if ('a' <= key && key <= 'z')
-+		err = register_sysrq_key(key, &au_sysrq_op);
-+	if (unlikely(err))
-+		pr_err("err %d, sysrq=%c\n", err, key);
-+	return err;
-+}
-+
-+void au_sysrq_fin(void)
-+{
-+	int err;
-+
-+	err = unregister_sysrq_key(*aufs_sysrq_key, &au_sysrq_op);
-+	if (unlikely(err))
-+		pr_err("err %d (ignored)\n", err);
-+}
-diff -Nur linux-4.1.10.orig/fs/aufs/vdir.c linux-4.1.10/fs/aufs/vdir.c
---- linux-4.1.10.orig/fs/aufs/vdir.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/vdir.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,888 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * virtual or vertical directory
-+ */
-+
-+#include "aufs.h"
-+
-+static unsigned int calc_size(int nlen)
-+{
-+	return ALIGN(sizeof(struct au_vdir_de) + nlen, sizeof(ino_t));
-+}
-+
-+static int set_deblk_end(union au_vdir_deblk_p *p,
-+			 union au_vdir_deblk_p *deblk_end)
-+{
-+	if (calc_size(0) <= deblk_end->deblk - p->deblk) {
-+		p->de->de_str.len = 0;
-+		/* smp_mb(); */
-+		return 0;
-+	}
-+	return -1; /* error */
-+}
-+
-+/* returns true or false */
-+static int is_deblk_end(union au_vdir_deblk_p *p,
-+			union au_vdir_deblk_p *deblk_end)
-+{
-+	if (calc_size(0) <= deblk_end->deblk - p->deblk)
-+		return !p->de->de_str.len;
-+	return 1;
-+}
-+
-+static unsigned char *last_deblk(struct au_vdir *vdir)
-+{
-+	return vdir->vd_deblk[vdir->vd_nblk - 1];
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* estimate the appropriate size for name hash table */
-+unsigned int au_rdhash_est(loff_t sz)
-+{
-+	unsigned int n;
-+
-+	n = UINT_MAX;
-+	sz >>= 10;
-+	if (sz < n)
-+		n = sz;
-+	if (sz < AUFS_RDHASH_DEF)
-+		n = AUFS_RDHASH_DEF;
-+	/* pr_info("n %u\n", n); */
-+	return n;
-+}
-+
-+/*
-+ * the allocated memory has to be freed by
-+ * au_nhash_wh_free() or au_nhash_de_free().
-+ */
-+int au_nhash_alloc(struct au_nhash *nhash, unsigned int num_hash, gfp_t gfp)
-+{
-+	struct hlist_head *head;
-+	unsigned int u;
-+	size_t sz;
-+
-+	sz = sizeof(*nhash->nh_head) * num_hash;
-+	head = kmalloc(sz, gfp);
-+	if (head) {
-+		nhash->nh_num = num_hash;
-+		nhash->nh_head = head;
-+		for (u = 0; u < num_hash; u++)
-+			INIT_HLIST_HEAD(head++);
-+		return 0; /* success */
-+	}
-+
-+	return -ENOMEM;
-+}
-+
-+static void nhash_count(struct hlist_head *head)
-+{
-+#if 0
-+	unsigned long n;
-+	struct hlist_node *pos;
-+
-+	n = 0;
-+	hlist_for_each(pos, head)
-+		n++;
-+	pr_info("%lu\n", n);
-+#endif
-+}
-+
-+static void au_nhash_wh_do_free(struct hlist_head *head)
-+{
-+	struct au_vdir_wh *pos;
-+	struct hlist_node *node;
-+
-+	hlist_for_each_entry_safe(pos, node, head, wh_hash)
-+		kfree(pos);
-+}
-+
-+static void au_nhash_de_do_free(struct hlist_head *head)
-+{
-+	struct au_vdir_dehstr *pos;
-+	struct hlist_node *node;
-+
-+	hlist_for_each_entry_safe(pos, node, head, hash)
-+		au_cache_free_vdir_dehstr(pos);
-+}
-+
-+static void au_nhash_do_free(struct au_nhash *nhash,
-+			     void (*free)(struct hlist_head *head))
-+{
-+	unsigned int n;
-+	struct hlist_head *head;
-+
-+	n = nhash->nh_num;
-+	if (!n)
-+		return;
-+
-+	head = nhash->nh_head;
-+	while (n-- > 0) {
-+		nhash_count(head);
-+		free(head++);
-+	}
-+	kfree(nhash->nh_head);
-+}
-+
-+void au_nhash_wh_free(struct au_nhash *whlist)
-+{
-+	au_nhash_do_free(whlist, au_nhash_wh_do_free);
-+}
-+
-+static void au_nhash_de_free(struct au_nhash *delist)
-+{
-+	au_nhash_do_free(delist, au_nhash_de_do_free);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+int au_nhash_test_longer_wh(struct au_nhash *whlist, aufs_bindex_t btgt,
-+			    int limit)
-+{
-+	int num;
-+	unsigned int u, n;
-+	struct hlist_head *head;
-+	struct au_vdir_wh *pos;
-+
-+	num = 0;
-+	n = whlist->nh_num;
-+	head = whlist->nh_head;
-+	for (u = 0; u < n; u++, head++)
-+		hlist_for_each_entry(pos, head, wh_hash)
-+			if (pos->wh_bindex == btgt && ++num > limit)
-+				return 1;
-+	return 0;
-+}
-+
-+static struct hlist_head *au_name_hash(struct au_nhash *nhash,
-+				       unsigned char *name,
-+				       unsigned int len)
-+{
-+	unsigned int v;
-+	/* const unsigned int magic_bit = 12; */
-+
-+	AuDebugOn(!nhash->nh_num || !nhash->nh_head);
-+
-+	v = 0;
-+	while (len--)
-+		v += *name++;
-+	/* v = hash_long(v, magic_bit); */
-+	v %= nhash->nh_num;
-+	return nhash->nh_head + v;
-+}
-+
-+static int au_nhash_test_name(struct au_vdir_destr *str, const char *name,
-+			      int nlen)
-+{
-+	return str->len == nlen && !memcmp(str->name, name, nlen);
-+}
-+
-+/* returns found or not */
-+int au_nhash_test_known_wh(struct au_nhash *whlist, char *name, int nlen)
-+{
-+	struct hlist_head *head;
-+	struct au_vdir_wh *pos;
-+	struct au_vdir_destr *str;
-+
-+	head = au_name_hash(whlist, name, nlen);
-+	hlist_for_each_entry(pos, head, wh_hash) {
-+		str = &pos->wh_str;
-+		AuDbg("%.*s\n", str->len, str->name);
-+		if (au_nhash_test_name(str, name, nlen))
-+			return 1;
-+	}
-+	return 0;
-+}
-+
-+/* returns found(true) or not */
-+static int test_known(struct au_nhash *delist, char *name, int nlen)
-+{
-+	struct hlist_head *head;
-+	struct au_vdir_dehstr *pos;
-+	struct au_vdir_destr *str;
-+
-+	head = au_name_hash(delist, name, nlen);
-+	hlist_for_each_entry(pos, head, hash) {
-+		str = pos->str;
-+		AuDbg("%.*s\n", str->len, str->name);
-+		if (au_nhash_test_name(str, name, nlen))
-+			return 1;
-+	}
-+	return 0;
-+}
-+
-+static void au_shwh_init_wh(struct au_vdir_wh *wh, ino_t ino,
-+			    unsigned char d_type)
-+{
-+#ifdef CONFIG_AUFS_SHWH
-+	wh->wh_ino = ino;
-+	wh->wh_type = d_type;
-+#endif
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+int au_nhash_append_wh(struct au_nhash *whlist, char *name, int nlen, ino_t ino,
-+		       unsigned int d_type, aufs_bindex_t bindex,
-+		       unsigned char shwh)
-+{
-+	int err;
-+	struct au_vdir_destr *str;
-+	struct au_vdir_wh *wh;
-+
-+	AuDbg("%.*s\n", nlen, name);
-+	AuDebugOn(!whlist->nh_num || !whlist->nh_head);
-+
-+	err = -ENOMEM;
-+	wh = kmalloc(sizeof(*wh) + nlen, GFP_NOFS);
-+	if (unlikely(!wh))
-+		goto out;
-+
-+	err = 0;
-+	wh->wh_bindex = bindex;
-+	if (shwh)
-+		au_shwh_init_wh(wh, ino, d_type);
-+	str = &wh->wh_str;
-+	str->len = nlen;
-+	memcpy(str->name, name, nlen);
-+	hlist_add_head(&wh->wh_hash, au_name_hash(whlist, name, nlen));
-+	/* smp_mb(); */
-+
-+out:
-+	return err;
-+}
-+
-+static int append_deblk(struct au_vdir *vdir)
-+{
-+	int err;
-+	unsigned long ul;
-+	const unsigned int deblk_sz = vdir->vd_deblk_sz;
-+	union au_vdir_deblk_p p, deblk_end;
-+	unsigned char **o;
-+
-+	err = -ENOMEM;
-+	o = krealloc(vdir->vd_deblk, sizeof(*o) * (vdir->vd_nblk + 1),
-+		     GFP_NOFS);
-+	if (unlikely(!o))
-+		goto out;
-+
-+	vdir->vd_deblk = o;
-+	p.deblk = kmalloc(deblk_sz, GFP_NOFS);
-+	if (p.deblk) {
-+		ul = vdir->vd_nblk++;
-+		vdir->vd_deblk[ul] = p.deblk;
-+		vdir->vd_last.ul = ul;
-+		vdir->vd_last.p.deblk = p.deblk;
-+		deblk_end.deblk = p.deblk + deblk_sz;
-+		err = set_deblk_end(&p, &deblk_end);
-+	}
-+
-+out:
-+	return err;
-+}
-+
-+static int append_de(struct au_vdir *vdir, char *name, int nlen, ino_t ino,
-+		     unsigned int d_type, struct au_nhash *delist)
-+{
-+	int err;
-+	unsigned int sz;
-+	const unsigned int deblk_sz = vdir->vd_deblk_sz;
-+	union au_vdir_deblk_p p, *room, deblk_end;
-+	struct au_vdir_dehstr *dehstr;
-+
-+	p.deblk = last_deblk(vdir);
-+	deblk_end.deblk = p.deblk + deblk_sz;
-+	room = &vdir->vd_last.p;
-+	AuDebugOn(room->deblk < p.deblk || deblk_end.deblk <= room->deblk
-+		  || !is_deblk_end(room, &deblk_end));
-+
-+	sz = calc_size(nlen);
-+	if (unlikely(sz > deblk_end.deblk - room->deblk)) {
-+		err = append_deblk(vdir);
-+		if (unlikely(err))
-+			goto out;
-+
-+		p.deblk = last_deblk(vdir);
-+		deblk_end.deblk = p.deblk + deblk_sz;
-+		/* smp_mb(); */
-+		AuDebugOn(room->deblk != p.deblk);
-+	}
-+
-+	err = -ENOMEM;
-+	dehstr = au_cache_alloc_vdir_dehstr();
-+	if (unlikely(!dehstr))
-+		goto out;
-+
-+	dehstr->str = &room->de->de_str;
-+	hlist_add_head(&dehstr->hash, au_name_hash(delist, name, nlen));
-+	room->de->de_ino = ino;
-+	room->de->de_type = d_type;
-+	room->de->de_str.len = nlen;
-+	memcpy(room->de->de_str.name, name, nlen);
-+
-+	err = 0;
-+	room->deblk += sz;
-+	if (unlikely(set_deblk_end(room, &deblk_end)))
-+		err = append_deblk(vdir);
-+	/* smp_mb(); */
-+
-+out:
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+void au_vdir_free(struct au_vdir *vdir)
-+{
-+	unsigned char **deblk;
-+
-+	deblk = vdir->vd_deblk;
-+	while (vdir->vd_nblk--)
-+		kfree(*deblk++);
-+	kfree(vdir->vd_deblk);
-+	au_cache_free_vdir(vdir);
-+}
-+
-+static struct au_vdir *alloc_vdir(struct file *file)
-+{
-+	struct au_vdir *vdir;
-+	struct super_block *sb;
-+	int err;
-+
-+	sb = file->f_path.dentry->d_sb;
-+	SiMustAnyLock(sb);
-+
-+	err = -ENOMEM;
-+	vdir = au_cache_alloc_vdir();
-+	if (unlikely(!vdir))
-+		goto out;
-+
-+	vdir->vd_deblk = kzalloc(sizeof(*vdir->vd_deblk), GFP_NOFS);
-+	if (unlikely(!vdir->vd_deblk))
-+		goto out_free;
-+
-+	vdir->vd_deblk_sz = au_sbi(sb)->si_rdblk;
-+	if (!vdir->vd_deblk_sz) {
-+		/* estimate the appropriate size for deblk */
-+		vdir->vd_deblk_sz = au_dir_size(file, /*dentry*/NULL);
-+		/* pr_info("vd_deblk_sz %u\n", vdir->vd_deblk_sz); */
-+	}
-+	vdir->vd_nblk = 0;
-+	vdir->vd_version = 0;
-+	vdir->vd_jiffy = 0;
-+	err = append_deblk(vdir);
-+	if (!err)
-+		return vdir; /* success */
-+
-+	kfree(vdir->vd_deblk);
-+
-+out_free:
-+	au_cache_free_vdir(vdir);
-+out:
-+	vdir = ERR_PTR(err);
-+	return vdir;
-+}
-+
-+static int reinit_vdir(struct au_vdir *vdir)
-+{
-+	int err;
-+	union au_vdir_deblk_p p, deblk_end;
-+
-+	while (vdir->vd_nblk > 1) {
-+		kfree(vdir->vd_deblk[vdir->vd_nblk - 1]);
-+		/* vdir->vd_deblk[vdir->vd_nblk - 1] = NULL; */
-+		vdir->vd_nblk--;
-+	}
-+	p.deblk = vdir->vd_deblk[0];
-+	deblk_end.deblk = p.deblk + vdir->vd_deblk_sz;
-+	err = set_deblk_end(&p, &deblk_end);
-+	/* keep vd_dblk_sz */
-+	vdir->vd_last.ul = 0;
-+	vdir->vd_last.p.deblk = vdir->vd_deblk[0];
-+	vdir->vd_version = 0;
-+	vdir->vd_jiffy = 0;
-+	/* smp_mb(); */
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+#define AuFillVdir_CALLED	1
-+#define AuFillVdir_WHABLE	(1 << 1)
-+#define AuFillVdir_SHWH		(1 << 2)
-+#define au_ftest_fillvdir(flags, name)	((flags) & AuFillVdir_##name)
-+#define au_fset_fillvdir(flags, name) \
-+	do { (flags) |= AuFillVdir_##name; } while (0)
-+#define au_fclr_fillvdir(flags, name) \
-+	do { (flags) &= ~AuFillVdir_##name; } while (0)
-+
-+#ifndef CONFIG_AUFS_SHWH
-+#undef AuFillVdir_SHWH
-+#define AuFillVdir_SHWH		0
-+#endif
-+
-+struct fillvdir_arg {
-+	struct dir_context	ctx;
-+	struct file		*file;
-+	struct au_vdir		*vdir;
-+	struct au_nhash		delist;
-+	struct au_nhash		whlist;
-+	aufs_bindex_t		bindex;
-+	unsigned int		flags;
-+	int			err;
-+};
-+
-+static int fillvdir(struct dir_context *ctx, const char *__name, int nlen,
-+		    loff_t offset __maybe_unused, u64 h_ino,
-+		    unsigned int d_type)
-+{
-+	struct fillvdir_arg *arg = container_of(ctx, struct fillvdir_arg, ctx);
-+	char *name = (void *)__name;
-+	struct super_block *sb;
-+	ino_t ino;
-+	const unsigned char shwh = !!au_ftest_fillvdir(arg->flags, SHWH);
-+
-+	arg->err = 0;
-+	sb = arg->file->f_path.dentry->d_sb;
-+	au_fset_fillvdir(arg->flags, CALLED);
-+	/* smp_mb(); */
-+	if (nlen <= AUFS_WH_PFX_LEN
-+	    || memcmp(name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) {
-+		if (test_known(&arg->delist, name, nlen)
-+		    || au_nhash_test_known_wh(&arg->whlist, name, nlen))
-+			goto out; /* already exists or whiteouted */
-+
-+		arg->err = au_ino(sb, arg->bindex, h_ino, d_type, &ino);
-+		if (!arg->err) {
-+			if (unlikely(nlen > AUFS_MAX_NAMELEN))
-+				d_type = DT_UNKNOWN;
-+			arg->err = append_de(arg->vdir, name, nlen, ino,
-+					     d_type, &arg->delist);
-+		}
-+	} else if (au_ftest_fillvdir(arg->flags, WHABLE)) {
-+		name += AUFS_WH_PFX_LEN;
-+		nlen -= AUFS_WH_PFX_LEN;
-+		if (au_nhash_test_known_wh(&arg->whlist, name, nlen))
-+			goto out; /* already whiteouted */
-+
-+		if (shwh)
-+			arg->err = au_wh_ino(sb, arg->bindex, h_ino, d_type,
-+					     &ino);
-+		if (!arg->err) {
-+			if (nlen <= AUFS_MAX_NAMELEN + AUFS_WH_PFX_LEN)
-+				d_type = DT_UNKNOWN;
-+			arg->err = au_nhash_append_wh
-+				(&arg->whlist, name, nlen, ino, d_type,
-+				 arg->bindex, shwh);
-+		}
-+	}
-+
-+out:
-+	if (!arg->err)
-+		arg->vdir->vd_jiffy = jiffies;
-+	/* smp_mb(); */
-+	AuTraceErr(arg->err);
-+	return arg->err;
-+}
-+
-+static int au_handle_shwh(struct super_block *sb, struct au_vdir *vdir,
-+			  struct au_nhash *whlist, struct au_nhash *delist)
-+{
-+#ifdef CONFIG_AUFS_SHWH
-+	int err;
-+	unsigned int nh, u;
-+	struct hlist_head *head;
-+	struct au_vdir_wh *pos;
-+	struct hlist_node *n;
-+	char *p, *o;
-+	struct au_vdir_destr *destr;
-+
-+	AuDebugOn(!au_opt_test(au_mntflags(sb), SHWH));
-+
-+	err = -ENOMEM;
-+	o = p = (void *)__get_free_page(GFP_NOFS);
-+	if (unlikely(!p))
-+		goto out;
-+
-+	err = 0;
-+	nh = whlist->nh_num;
-+	memcpy(p, AUFS_WH_PFX, AUFS_WH_PFX_LEN);
-+	p += AUFS_WH_PFX_LEN;
-+	for (u = 0; u < nh; u++) {
-+		head = whlist->nh_head + u;
-+		hlist_for_each_entry_safe(pos, n, head, wh_hash) {
-+			destr = &pos->wh_str;
-+			memcpy(p, destr->name, destr->len);
-+			err = append_de(vdir, o, destr->len + AUFS_WH_PFX_LEN,
-+					pos->wh_ino, pos->wh_type, delist);
-+			if (unlikely(err))
-+				break;
-+		}
-+	}
-+
-+	free_page((unsigned long)o);
-+
-+out:
-+	AuTraceErr(err);
-+	return err;
-+#else
-+	return 0;
-+#endif
-+}
-+
-+static int au_do_read_vdir(struct fillvdir_arg *arg)
-+{
-+	int err;
-+	unsigned int rdhash;
-+	loff_t offset;
-+	aufs_bindex_t bend, bindex, bstart;
-+	unsigned char shwh;
-+	struct file *hf, *file;
-+	struct super_block *sb;
-+
-+	file = arg->file;
-+	sb = file->f_path.dentry->d_sb;
-+	SiMustAnyLock(sb);
-+
-+	rdhash = au_sbi(sb)->si_rdhash;
-+	if (!rdhash)
-+		rdhash = au_rdhash_est(au_dir_size(file, /*dentry*/NULL));
-+	err = au_nhash_alloc(&arg->delist, rdhash, GFP_NOFS);
-+	if (unlikely(err))
-+		goto out;
-+	err = au_nhash_alloc(&arg->whlist, rdhash, GFP_NOFS);
-+	if (unlikely(err))
-+		goto out_delist;
-+
-+	err = 0;
-+	arg->flags = 0;
-+	shwh = 0;
-+	if (au_opt_test(au_mntflags(sb), SHWH)) {
-+		shwh = 1;
-+		au_fset_fillvdir(arg->flags, SHWH);
-+	}
-+	bstart = au_fbstart(file);
-+	bend = au_fbend_dir(file);
-+	for (bindex = bstart; !err && bindex <= bend; bindex++) {
-+		hf = au_hf_dir(file, bindex);
-+		if (!hf)
-+			continue;
-+
-+		offset = vfsub_llseek(hf, 0, SEEK_SET);
-+		err = offset;
-+		if (unlikely(offset))
-+			break;
-+
-+		arg->bindex = bindex;
-+		au_fclr_fillvdir(arg->flags, WHABLE);
-+		if (shwh
-+		    || (bindex != bend
-+			&& au_br_whable(au_sbr_perm(sb, bindex))))
-+			au_fset_fillvdir(arg->flags, WHABLE);
-+		do {
-+			arg->err = 0;
-+			au_fclr_fillvdir(arg->flags, CALLED);
-+			/* smp_mb(); */
-+			err = vfsub_iterate_dir(hf, &arg->ctx);
-+			if (err >= 0)
-+				err = arg->err;
-+		} while (!err && au_ftest_fillvdir(arg->flags, CALLED));
-+
-+		/*
-+		 * dir_relax() may be good for concurrency, but aufs should not
-+		 * use it since it will cause a lockdep problem.
-+		 */
-+	}
-+
-+	if (!err && shwh)
-+		err = au_handle_shwh(sb, arg->vdir, &arg->whlist, &arg->delist);
-+
-+	au_nhash_wh_free(&arg->whlist);
-+
-+out_delist:
-+	au_nhash_de_free(&arg->delist);
-+out:
-+	return err;
-+}
-+
-+static int read_vdir(struct file *file, int may_read)
-+{
-+	int err;
-+	unsigned long expire;
-+	unsigned char do_read;
-+	struct fillvdir_arg arg = {
-+		.ctx = {
-+			.actor = fillvdir
-+		}
-+	};
-+	struct inode *inode;
-+	struct au_vdir *vdir, *allocated;
-+
-+	err = 0;
-+	inode = file_inode(file);
-+	IMustLock(inode);
-+	SiMustAnyLock(inode->i_sb);
-+
-+	allocated = NULL;
-+	do_read = 0;
-+	expire = au_sbi(inode->i_sb)->si_rdcache;
-+	vdir = au_ivdir(inode);
-+	if (!vdir) {
-+		do_read = 1;
-+		vdir = alloc_vdir(file);
-+		err = PTR_ERR(vdir);
-+		if (IS_ERR(vdir))
-+			goto out;
-+		err = 0;
-+		allocated = vdir;
-+	} else if (may_read
-+		   && (inode->i_version != vdir->vd_version
-+		       || time_after(jiffies, vdir->vd_jiffy + expire))) {
-+		do_read = 1;
-+		err = reinit_vdir(vdir);
-+		if (unlikely(err))
-+			goto out;
-+	}
-+
-+	if (!do_read)
-+		return 0; /* success */
-+
-+	arg.file = file;
-+	arg.vdir = vdir;
-+	err = au_do_read_vdir(&arg);
-+	if (!err) {
-+		/* file->f_pos = 0; */ /* todo: ctx->pos? */
-+		vdir->vd_version = inode->i_version;
-+		vdir->vd_last.ul = 0;
-+		vdir->vd_last.p.deblk = vdir->vd_deblk[0];
-+		if (allocated)
-+			au_set_ivdir(inode, allocated);
-+	} else if (allocated)
-+		au_vdir_free(allocated);
-+
-+out:
-+	return err;
-+}
-+
-+static int copy_vdir(struct au_vdir *tgt, struct au_vdir *src)
-+{
-+	int err, rerr;
-+	unsigned long ul, n;
-+	const unsigned int deblk_sz = src->vd_deblk_sz;
-+
-+	AuDebugOn(tgt->vd_nblk != 1);
-+
-+	err = -ENOMEM;
-+	if (tgt->vd_nblk < src->vd_nblk) {
-+		unsigned char **p;
-+
-+		p = krealloc(tgt->vd_deblk, sizeof(*p) * src->vd_nblk,
-+			     GFP_NOFS);
-+		if (unlikely(!p))
-+			goto out;
-+		tgt->vd_deblk = p;
-+	}
-+
-+	if (tgt->vd_deblk_sz != deblk_sz) {
-+		unsigned char *p;
-+
-+		tgt->vd_deblk_sz = deblk_sz;
-+		p = krealloc(tgt->vd_deblk[0], deblk_sz, GFP_NOFS);
-+		if (unlikely(!p))
-+			goto out;
-+		tgt->vd_deblk[0] = p;
-+	}
-+	memcpy(tgt->vd_deblk[0], src->vd_deblk[0], deblk_sz);
-+	tgt->vd_version = src->vd_version;
-+	tgt->vd_jiffy = src->vd_jiffy;
-+
-+	n = src->vd_nblk;
-+	for (ul = 1; ul < n; ul++) {
-+		tgt->vd_deblk[ul] = kmemdup(src->vd_deblk[ul], deblk_sz,
-+					    GFP_NOFS);
-+		if (unlikely(!tgt->vd_deblk[ul]))
-+			goto out;
-+		tgt->vd_nblk++;
-+	}
-+	tgt->vd_nblk = n;
-+	tgt->vd_last.ul = tgt->vd_last.ul;
-+	tgt->vd_last.p.deblk = tgt->vd_deblk[tgt->vd_last.ul];
-+	tgt->vd_last.p.deblk += src->vd_last.p.deblk
-+		- src->vd_deblk[src->vd_last.ul];
-+	/* smp_mb(); */
-+	return 0; /* success */
-+
-+out:
-+	rerr = reinit_vdir(tgt);
-+	BUG_ON(rerr);
-+	return err;
-+}
-+
-+int au_vdir_init(struct file *file)
-+{
-+	int err;
-+	struct inode *inode;
-+	struct au_vdir *vdir_cache, *allocated;
-+
-+	/* test file->f_pos here instead of ctx->pos */
-+	err = read_vdir(file, !file->f_pos);
-+	if (unlikely(err))
-+		goto out;
-+
-+	allocated = NULL;
-+	vdir_cache = au_fvdir_cache(file);
-+	if (!vdir_cache) {
-+		vdir_cache = alloc_vdir(file);
-+		err = PTR_ERR(vdir_cache);
-+		if (IS_ERR(vdir_cache))
-+			goto out;
-+		allocated = vdir_cache;
-+	} else if (!file->f_pos && vdir_cache->vd_version != file->f_version) {
-+		/* test file->f_pos here instead of ctx->pos */
-+		err = reinit_vdir(vdir_cache);
-+		if (unlikely(err))
-+			goto out;
-+	} else
-+		return 0; /* success */
-+
-+	inode = file_inode(file);
-+	err = copy_vdir(vdir_cache, au_ivdir(inode));
-+	if (!err) {
-+		file->f_version = inode->i_version;
-+		if (allocated)
-+			au_set_fvdir_cache(file, allocated);
-+	} else if (allocated)
-+		au_vdir_free(allocated);
-+
-+out:
-+	return err;
-+}
-+
-+static loff_t calc_offset(struct au_vdir *vdir)
-+{
-+	loff_t offset;
-+	union au_vdir_deblk_p p;
-+
-+	p.deblk = vdir->vd_deblk[vdir->vd_last.ul];
-+	offset = vdir->vd_last.p.deblk - p.deblk;
-+	offset += vdir->vd_deblk_sz * vdir->vd_last.ul;
-+	return offset;
-+}
-+
-+/* returns true or false */
-+static int seek_vdir(struct file *file, struct dir_context *ctx)
-+{
-+	int valid;
-+	unsigned int deblk_sz;
-+	unsigned long ul, n;
-+	loff_t offset;
-+	union au_vdir_deblk_p p, deblk_end;
-+	struct au_vdir *vdir_cache;
-+
-+	valid = 1;
-+	vdir_cache = au_fvdir_cache(file);
-+	offset = calc_offset(vdir_cache);
-+	AuDbg("offset %lld\n", offset);
-+	if (ctx->pos == offset)
-+		goto out;
-+
-+	vdir_cache->vd_last.ul = 0;
-+	vdir_cache->vd_last.p.deblk = vdir_cache->vd_deblk[0];
-+	if (!ctx->pos)
-+		goto out;
-+
-+	valid = 0;
-+	deblk_sz = vdir_cache->vd_deblk_sz;
-+	ul = div64_u64(ctx->pos, deblk_sz);
-+	AuDbg("ul %lu\n", ul);
-+	if (ul >= vdir_cache->vd_nblk)
-+		goto out;
-+
-+	n = vdir_cache->vd_nblk;
-+	for (; ul < n; ul++) {
-+		p.deblk = vdir_cache->vd_deblk[ul];
-+		deblk_end.deblk = p.deblk + deblk_sz;
-+		offset = ul;
-+		offset *= deblk_sz;
-+		while (!is_deblk_end(&p, &deblk_end) && offset < ctx->pos) {
-+			unsigned int l;
-+
-+			l = calc_size(p.de->de_str.len);
-+			offset += l;
-+			p.deblk += l;
-+		}
-+		if (!is_deblk_end(&p, &deblk_end)) {
-+			valid = 1;
-+			vdir_cache->vd_last.ul = ul;
-+			vdir_cache->vd_last.p = p;
-+			break;
-+		}
-+	}
-+
-+out:
-+	/* smp_mb(); */
-+	AuTraceErr(!valid);
-+	return valid;
-+}
-+
-+int au_vdir_fill_de(struct file *file, struct dir_context *ctx)
-+{
-+	unsigned int l, deblk_sz;
-+	union au_vdir_deblk_p deblk_end;
-+	struct au_vdir *vdir_cache;
-+	struct au_vdir_de *de;
-+
-+	vdir_cache = au_fvdir_cache(file);
-+	if (!seek_vdir(file, ctx))
-+		return 0;
-+
-+	deblk_sz = vdir_cache->vd_deblk_sz;
-+	while (1) {
-+		deblk_end.deblk = vdir_cache->vd_deblk[vdir_cache->vd_last.ul];
-+		deblk_end.deblk += deblk_sz;
-+		while (!is_deblk_end(&vdir_cache->vd_last.p, &deblk_end)) {
-+			de = vdir_cache->vd_last.p.de;
-+			AuDbg("%.*s, off%lld, i%lu, dt%d\n",
-+			      de->de_str.len, de->de_str.name, ctx->pos,
-+			      (unsigned long)de->de_ino, de->de_type);
-+			if (unlikely(!dir_emit(ctx, de->de_str.name,
-+					       de->de_str.len, de->de_ino,
-+					       de->de_type))) {
-+				/* todo: ignore the error caused by udba? */
-+				/* return err; */
-+				return 0;
-+			}
-+
-+			l = calc_size(de->de_str.len);
-+			vdir_cache->vd_last.p.deblk += l;
-+			ctx->pos += l;
-+		}
-+		if (vdir_cache->vd_last.ul < vdir_cache->vd_nblk - 1) {
-+			vdir_cache->vd_last.ul++;
-+			vdir_cache->vd_last.p.deblk
-+				= vdir_cache->vd_deblk[vdir_cache->vd_last.ul];
-+			ctx->pos = deblk_sz * vdir_cache->vd_last.ul;
-+			continue;
-+		}
-+		break;
-+	}
-+
-+	/* smp_mb(); */
-+	return 0;
-+}
-diff -Nur linux-4.1.10.orig/fs/aufs/vfsub.c linux-4.1.10/fs/aufs/vfsub.c
---- linux-4.1.10.orig/fs/aufs/vfsub.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/vfsub.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,848 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * sub-routines for VFS
-+ */
-+
-+#include <linux/namei.h>
-+#include <linux/security.h>
-+#include <linux/splice.h>
-+#include "aufs.h"
-+
-+int vfsub_update_h_iattr(struct path *h_path, int *did)
-+{
-+	int err;
-+	struct kstat st;
-+	struct super_block *h_sb;
-+
-+	/* for remote fs, leave work for its getattr or d_revalidate */
-+	/* for bad i_attr fs, handle them in aufs_getattr() */
-+	/* still some fs may acquire i_mutex. we need to skip them */
-+	err = 0;
-+	if (!did)
-+		did = &err;
-+	h_sb = h_path->dentry->d_sb;
-+	*did = (!au_test_fs_remote(h_sb) && au_test_fs_refresh_iattr(h_sb));
-+	if (*did)
-+		err = vfs_getattr(h_path, &st);
-+
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+struct file *vfsub_dentry_open(struct path *path, int flags)
-+{
-+	struct file *file;
-+
-+	file = dentry_open(path, flags /* | __FMODE_NONOTIFY */,
-+			   current_cred());
-+	if (!IS_ERR_OR_NULL(file)
-+	    && (file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
-+		i_readcount_inc(d_inode(path->dentry));
-+
-+	return file;
-+}
-+
-+struct file *vfsub_filp_open(const char *path, int oflags, int mode)
-+{
-+	struct file *file;
-+
-+	lockdep_off();
-+	file = filp_open(path,
-+			 oflags /* | __FMODE_NONOTIFY */,
-+			 mode);
-+	lockdep_on();
-+	if (IS_ERR(file))
-+		goto out;
-+	vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/
-+
-+out:
-+	return file;
-+}
-+
-+/*
-+ * Ideally this function should call VFS:do_last() in order to keep all its
-+ * checkings. But it is very hard for aufs to regenerate several VFS internal
-+ * structure such as nameidata. This is a second (or third) best approach.
-+ * cf. linux/fs/namei.c:do_last(), lookup_open() and atomic_open().
-+ */
-+int vfsub_atomic_open(struct inode *dir, struct dentry *dentry,
-+		      struct vfsub_aopen_args *args, struct au_branch *br)
-+{
-+	int err;
-+	struct file *file = args->file;
-+	/* copied from linux/fs/namei.c:atomic_open() */
-+	struct dentry *const DENTRY_NOT_SET = (void *)-1UL;
-+
-+	IMustLock(dir);
-+	AuDebugOn(!dir->i_op->atomic_open);
-+
-+	err = au_br_test_oflag(args->open_flag, br);
-+	if (unlikely(err))
-+		goto out;
-+
-+	args->file->f_path.dentry = DENTRY_NOT_SET;
-+	args->file->f_path.mnt = au_br_mnt(br);
-+	err = dir->i_op->atomic_open(dir, dentry, file, args->open_flag,
-+				     args->create_mode, args->opened);
-+	if (err >= 0) {
-+		/* some filesystems don't set FILE_CREATED while succeeded? */
-+		if (*args->opened & FILE_CREATED)
-+			fsnotify_create(dir, dentry);
-+	} else
-+		goto out;
-+
-+
-+	if (!err) {
-+		/* todo: call VFS:may_open() here */
-+		err = open_check_o_direct(file);
-+		/* todo: ima_file_check() too? */
-+		if (!err && (args->open_flag & __FMODE_EXEC))
-+			err = deny_write_access(file);
-+		if (unlikely(err))
-+			/* note that the file is created and still opened */
-+			goto out;
-+	}
-+
-+	atomic_inc(&br->br_count);
-+	fsnotify_open(file);
-+
-+out:
-+	return err;
-+}
-+
-+int vfsub_kern_path(const char *name, unsigned int flags, struct path *path)
-+{
-+	int err;
-+
-+	err = kern_path(name, flags, path);
-+	if (!err && d_is_positive(path->dentry))
-+		vfsub_update_h_iattr(path, /*did*/NULL); /*ignore*/
-+	return err;
-+}
-+
-+struct dentry *vfsub_lookup_one_len(const char *name, struct dentry *parent,
-+				    int len)
-+{
-+	struct path path = {
-+		.mnt = NULL
-+	};
-+
-+	/* VFS checks it too, but by WARN_ON_ONCE() */
-+	IMustLock(d_inode(parent));
-+
-+	path.dentry = lookup_one_len(name, parent, len);
-+	if (IS_ERR(path.dentry))
-+		goto out;
-+	if (d_is_positive(path.dentry))
-+		vfsub_update_h_iattr(&path, /*did*/NULL); /*ignore*/
-+
-+out:
-+	AuTraceErrPtr(path.dentry);
-+	return path.dentry;
-+}
-+
-+void vfsub_call_lkup_one(void *args)
-+{
-+	struct vfsub_lkup_one_args *a = args;
-+	*a->errp = vfsub_lkup_one(a->name, a->parent);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+struct dentry *vfsub_lock_rename(struct dentry *d1, struct au_hinode *hdir1,
-+				 struct dentry *d2, struct au_hinode *hdir2)
-+{
-+	struct dentry *d;
-+
-+	lockdep_off();
-+	d = lock_rename(d1, d2);
-+	lockdep_on();
-+	au_hn_suspend(hdir1);
-+	if (hdir1 != hdir2)
-+		au_hn_suspend(hdir2);
-+
-+	return d;
-+}
-+
-+void vfsub_unlock_rename(struct dentry *d1, struct au_hinode *hdir1,
-+			 struct dentry *d2, struct au_hinode *hdir2)
-+{
-+	au_hn_resume(hdir1);
-+	if (hdir1 != hdir2)
-+		au_hn_resume(hdir2);
-+	lockdep_off();
-+	unlock_rename(d1, d2);
-+	lockdep_on();
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+int vfsub_create(struct inode *dir, struct path *path, int mode, bool want_excl)
-+{
-+	int err;
-+	struct dentry *d;
-+
-+	IMustLock(dir);
-+
-+	d = path->dentry;
-+	path->dentry = d->d_parent;
-+	err = security_path_mknod(path, d, mode, 0);
-+	path->dentry = d;
-+	if (unlikely(err))
-+		goto out;
-+
-+	lockdep_off();
-+	err = vfs_create(dir, path->dentry, mode, want_excl);
-+	lockdep_on();
-+	if (!err) {
-+		struct path tmp = *path;
-+		int did;
-+
-+		vfsub_update_h_iattr(&tmp, &did);
-+		if (did) {
-+			tmp.dentry = path->dentry->d_parent;
-+			vfsub_update_h_iattr(&tmp, /*did*/NULL);
-+		}
-+		/*ignore*/
-+	}
-+
-+out:
-+	return err;
-+}
-+
-+int vfsub_symlink(struct inode *dir, struct path *path, const char *symname)
-+{
-+	int err;
-+	struct dentry *d;
-+
-+	IMustLock(dir);
-+
-+	d = path->dentry;
-+	path->dentry = d->d_parent;
-+	err = security_path_symlink(path, d, symname);
-+	path->dentry = d;
-+	if (unlikely(err))
-+		goto out;
-+
-+	lockdep_off();
-+	err = vfs_symlink(dir, path->dentry, symname);
-+	lockdep_on();
-+	if (!err) {
-+		struct path tmp = *path;
-+		int did;
-+
-+		vfsub_update_h_iattr(&tmp, &did);
-+		if (did) {
-+			tmp.dentry = path->dentry->d_parent;
-+			vfsub_update_h_iattr(&tmp, /*did*/NULL);
-+		}
-+		/*ignore*/
-+	}
-+
-+out:
-+	return err;
-+}
-+
-+int vfsub_mknod(struct inode *dir, struct path *path, int mode, dev_t dev)
-+{
-+	int err;
-+	struct dentry *d;
-+
-+	IMustLock(dir);
-+
-+	d = path->dentry;
-+	path->dentry = d->d_parent;
-+	err = security_path_mknod(path, d, mode, new_encode_dev(dev));
-+	path->dentry = d;
-+	if (unlikely(err))
-+		goto out;
-+
-+	lockdep_off();
-+	err = vfs_mknod(dir, path->dentry, mode, dev);
-+	lockdep_on();
-+	if (!err) {
-+		struct path tmp = *path;
-+		int did;
-+
-+		vfsub_update_h_iattr(&tmp, &did);
-+		if (did) {
-+			tmp.dentry = path->dentry->d_parent;
-+			vfsub_update_h_iattr(&tmp, /*did*/NULL);
-+		}
-+		/*ignore*/
-+	}
-+
-+out:
-+	return err;
-+}
-+
-+static int au_test_nlink(struct inode *inode)
-+{
-+	const unsigned int link_max = UINT_MAX >> 1; /* rough margin */
-+
-+	if (!au_test_fs_no_limit_nlink(inode->i_sb)
-+	    || inode->i_nlink < link_max)
-+		return 0;
-+	return -EMLINK;
-+}
-+
-+int vfsub_link(struct dentry *src_dentry, struct inode *dir, struct path *path,
-+	       struct inode **delegated_inode)
-+{
-+	int err;
-+	struct dentry *d;
-+
-+	IMustLock(dir);
-+
-+	err = au_test_nlink(d_inode(src_dentry));
-+	if (unlikely(err))
-+		return err;
-+
-+	/* we don't call may_linkat() */
-+	d = path->dentry;
-+	path->dentry = d->d_parent;
-+	err = security_path_link(src_dentry, path, d);
-+	path->dentry = d;
-+	if (unlikely(err))
-+		goto out;
-+
-+	lockdep_off();
-+	err = vfs_link(src_dentry, dir, path->dentry, delegated_inode);
-+	lockdep_on();
-+	if (!err) {
-+		struct path tmp = *path;
-+		int did;
-+
-+		/* fuse has different memory inode for the same inumber */
-+		vfsub_update_h_iattr(&tmp, &did);
-+		if (did) {
-+			tmp.dentry = path->dentry->d_parent;
-+			vfsub_update_h_iattr(&tmp, /*did*/NULL);
-+			tmp.dentry = src_dentry;
-+			vfsub_update_h_iattr(&tmp, /*did*/NULL);
-+		}
-+		/*ignore*/
-+	}
-+
-+out:
-+	return err;
-+}
-+
-+int vfsub_rename(struct inode *src_dir, struct dentry *src_dentry,
-+		 struct inode *dir, struct path *path,
-+		 struct inode **delegated_inode)
-+{
-+	int err;
-+	struct path tmp = {
-+		.mnt	= path->mnt
-+	};
-+	struct dentry *d;
-+
-+	IMustLock(dir);
-+	IMustLock(src_dir);
-+
-+	d = path->dentry;
-+	path->dentry = d->d_parent;
-+	tmp.dentry = src_dentry->d_parent;
-+	err = security_path_rename(&tmp, src_dentry, path, d, /*flags*/0);
-+	path->dentry = d;
-+	if (unlikely(err))
-+		goto out;
-+
-+	lockdep_off();
-+	err = vfs_rename(src_dir, src_dentry, dir, path->dentry,
-+			 delegated_inode, /*flags*/0);
-+	lockdep_on();
-+	if (!err) {
-+		int did;
-+
-+		tmp.dentry = d->d_parent;
-+		vfsub_update_h_iattr(&tmp, &did);
-+		if (did) {
-+			tmp.dentry = src_dentry;
-+			vfsub_update_h_iattr(&tmp, /*did*/NULL);
-+			tmp.dentry = src_dentry->d_parent;
-+			vfsub_update_h_iattr(&tmp, /*did*/NULL);
-+		}
-+		/*ignore*/
-+	}
-+
-+out:
-+	return err;
-+}
-+
-+int vfsub_mkdir(struct inode *dir, struct path *path, int mode)
-+{
-+	int err;
-+	struct dentry *d;
-+
-+	IMustLock(dir);
-+
-+	d = path->dentry;
-+	path->dentry = d->d_parent;
-+	err = security_path_mkdir(path, d, mode);
-+	path->dentry = d;
-+	if (unlikely(err))
-+		goto out;
-+
-+	lockdep_off();
-+	err = vfs_mkdir(dir, path->dentry, mode);
-+	lockdep_on();
-+	if (!err) {
-+		struct path tmp = *path;
-+		int did;
-+
-+		vfsub_update_h_iattr(&tmp, &did);
-+		if (did) {
-+			tmp.dentry = path->dentry->d_parent;
-+			vfsub_update_h_iattr(&tmp, /*did*/NULL);
-+		}
-+		/*ignore*/
-+	}
-+
-+out:
-+	return err;
-+}
-+
-+int vfsub_rmdir(struct inode *dir, struct path *path)
-+{
-+	int err;
-+	struct dentry *d;
-+
-+	IMustLock(dir);
-+
-+	d = path->dentry;
-+	path->dentry = d->d_parent;
-+	err = security_path_rmdir(path, d);
-+	path->dentry = d;
-+	if (unlikely(err))
-+		goto out;
-+
-+	lockdep_off();
-+	err = vfs_rmdir(dir, path->dentry);
-+	lockdep_on();
-+	if (!err) {
-+		struct path tmp = {
-+			.dentry	= path->dentry->d_parent,
-+			.mnt	= path->mnt
-+		};
-+
-+		vfsub_update_h_iattr(&tmp, /*did*/NULL); /*ignore*/
-+	}
-+
-+out:
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* todo: support mmap_sem? */
-+ssize_t vfsub_read_u(struct file *file, char __user *ubuf, size_t count,
-+		     loff_t *ppos)
-+{
-+	ssize_t err;
-+
-+	lockdep_off();
-+	err = vfs_read(file, ubuf, count, ppos);
-+	lockdep_on();
-+	if (err >= 0)
-+		vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/
-+	return err;
-+}
-+
-+/* todo: kernel_read()? */
-+ssize_t vfsub_read_k(struct file *file, void *kbuf, size_t count,
-+		     loff_t *ppos)
-+{
-+	ssize_t err;
-+	mm_segment_t oldfs;
-+	union {
-+		void *k;
-+		char __user *u;
-+	} buf;
-+
-+	buf.k = kbuf;
-+	oldfs = get_fs();
-+	set_fs(KERNEL_DS);
-+	err = vfsub_read_u(file, buf.u, count, ppos);
-+	set_fs(oldfs);
-+	return err;
-+}
-+
-+ssize_t vfsub_write_u(struct file *file, const char __user *ubuf, size_t count,
-+		      loff_t *ppos)
-+{
-+	ssize_t err;
-+
-+	lockdep_off();
-+	err = vfs_write(file, ubuf, count, ppos);
-+	lockdep_on();
-+	if (err >= 0)
-+		vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/
-+	return err;
-+}
-+
-+ssize_t vfsub_write_k(struct file *file, void *kbuf, size_t count, loff_t *ppos)
-+{
-+	ssize_t err;
-+	mm_segment_t oldfs;
-+	union {
-+		void *k;
-+		const char __user *u;
-+	} buf;
-+
-+	buf.k = kbuf;
-+	oldfs = get_fs();
-+	set_fs(KERNEL_DS);
-+	err = vfsub_write_u(file, buf.u, count, ppos);
-+	set_fs(oldfs);
-+	return err;
-+}
-+
-+int vfsub_flush(struct file *file, fl_owner_t id)
-+{
-+	int err;
-+
-+	err = 0;
-+	if (file->f_op->flush) {
-+		if (!au_test_nfs(file->f_path.dentry->d_sb))
-+			err = file->f_op->flush(file, id);
-+		else {
-+			lockdep_off();
-+			err = file->f_op->flush(file, id);
-+			lockdep_on();
-+		}
-+		if (!err)
-+			vfsub_update_h_iattr(&file->f_path, /*did*/NULL);
-+		/*ignore*/
-+	}
-+	return err;
-+}
-+
-+int vfsub_iterate_dir(struct file *file, struct dir_context *ctx)
-+{
-+	int err;
-+
-+	AuDbg("%pD, ctx{%pf, %llu}\n", file, ctx->actor, ctx->pos);
-+
-+	lockdep_off();
-+	err = iterate_dir(file, ctx);
-+	lockdep_on();
-+	if (err >= 0)
-+		vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/
-+	return err;
-+}
-+
-+long vfsub_splice_to(struct file *in, loff_t *ppos,
-+		     struct pipe_inode_info *pipe, size_t len,
-+		     unsigned int flags)
-+{
-+	long err;
-+
-+	lockdep_off();
-+	err = do_splice_to(in, ppos, pipe, len, flags);
-+	lockdep_on();
-+	file_accessed(in);
-+	if (err >= 0)
-+		vfsub_update_h_iattr(&in->f_path, /*did*/NULL); /*ignore*/
-+	return err;
-+}
-+
-+long vfsub_splice_from(struct pipe_inode_info *pipe, struct file *out,
-+		       loff_t *ppos, size_t len, unsigned int flags)
-+{
-+	long err;
-+
-+	lockdep_off();
-+	err = do_splice_from(pipe, out, ppos, len, flags);
-+	lockdep_on();
-+	if (err >= 0)
-+		vfsub_update_h_iattr(&out->f_path, /*did*/NULL); /*ignore*/
-+	return err;
-+}
-+
-+int vfsub_fsync(struct file *file, struct path *path, int datasync)
-+{
-+	int err;
-+
-+	/* file can be NULL */
-+	lockdep_off();
-+	err = vfs_fsync(file, datasync);
-+	lockdep_on();
-+	if (!err) {
-+		if (!path) {
-+			AuDebugOn(!file);
-+			path = &file->f_path;
-+		}
-+		vfsub_update_h_iattr(path, /*did*/NULL); /*ignore*/
-+	}
-+	return err;
-+}
-+
-+/* cf. open.c:do_sys_truncate() and do_sys_ftruncate() */
-+int vfsub_trunc(struct path *h_path, loff_t length, unsigned int attr,
-+		struct file *h_file)
-+{
-+	int err;
-+	struct inode *h_inode;
-+	struct super_block *h_sb;
-+
-+	if (!h_file) {
-+		err = vfsub_truncate(h_path, length);
-+		goto out;
-+	}
-+
-+	h_inode = d_inode(h_path->dentry);
-+	h_sb = h_inode->i_sb;
-+	lockdep_off();
-+	sb_start_write(h_sb);
-+	lockdep_on();
-+	err = locks_verify_truncate(h_inode, h_file, length);
-+	if (!err)
-+		err = security_path_truncate(h_path);
-+	if (!err) {
-+		lockdep_off();
-+		err = do_truncate(h_path->dentry, length, attr, h_file);
-+		lockdep_on();
-+	}
-+	lockdep_off();
-+	sb_end_write(h_sb);
-+	lockdep_on();
-+
-+out:
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+struct au_vfsub_mkdir_args {
-+	int *errp;
-+	struct inode *dir;
-+	struct path *path;
-+	int mode;
-+};
-+
-+static void au_call_vfsub_mkdir(void *args)
-+{
-+	struct au_vfsub_mkdir_args *a = args;
-+	*a->errp = vfsub_mkdir(a->dir, a->path, a->mode);
-+}
-+
-+int vfsub_sio_mkdir(struct inode *dir, struct path *path, int mode)
-+{
-+	int err, do_sio, wkq_err;
-+
-+	do_sio = au_test_h_perm_sio(dir, MAY_EXEC | MAY_WRITE);
-+	if (!do_sio) {
-+		lockdep_off();
-+		err = vfsub_mkdir(dir, path, mode);
-+		lockdep_on();
-+	} else {
-+		struct au_vfsub_mkdir_args args = {
-+			.errp	= &err,
-+			.dir	= dir,
-+			.path	= path,
-+			.mode	= mode
-+		};
-+		wkq_err = au_wkq_wait(au_call_vfsub_mkdir, &args);
-+		if (unlikely(wkq_err))
-+			err = wkq_err;
-+	}
-+
-+	return err;
-+}
-+
-+struct au_vfsub_rmdir_args {
-+	int *errp;
-+	struct inode *dir;
-+	struct path *path;
-+};
-+
-+static void au_call_vfsub_rmdir(void *args)
-+{
-+	struct au_vfsub_rmdir_args *a = args;
-+	*a->errp = vfsub_rmdir(a->dir, a->path);
-+}
-+
-+int vfsub_sio_rmdir(struct inode *dir, struct path *path)
-+{
-+	int err, do_sio, wkq_err;
-+
-+	do_sio = au_test_h_perm_sio(dir, MAY_EXEC | MAY_WRITE);
-+	if (!do_sio) {
-+		lockdep_off();
-+		err = vfsub_rmdir(dir, path);
-+		lockdep_on();
-+	} else {
-+		struct au_vfsub_rmdir_args args = {
-+			.errp	= &err,
-+			.dir	= dir,
-+			.path	= path
-+		};
-+		wkq_err = au_wkq_wait(au_call_vfsub_rmdir, &args);
-+		if (unlikely(wkq_err))
-+			err = wkq_err;
-+	}
-+
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+struct notify_change_args {
-+	int *errp;
-+	struct path *path;
-+	struct iattr *ia;
-+	struct inode **delegated_inode;
-+};
-+
-+static void call_notify_change(void *args)
-+{
-+	struct notify_change_args *a = args;
-+	struct inode *h_inode;
-+
-+	h_inode = d_inode(a->path->dentry);
-+	IMustLock(h_inode);
-+
-+	*a->errp = -EPERM;
-+	if (!IS_IMMUTABLE(h_inode) && !IS_APPEND(h_inode)) {
-+		lockdep_off();
-+		*a->errp = notify_change(a->path->dentry, a->ia,
-+					 a->delegated_inode);
-+		lockdep_on();
-+		if (!*a->errp)
-+			vfsub_update_h_iattr(a->path, /*did*/NULL); /*ignore*/
-+	}
-+	AuTraceErr(*a->errp);
-+}
-+
-+int vfsub_notify_change(struct path *path, struct iattr *ia,
-+			struct inode **delegated_inode)
-+{
-+	int err;
-+	struct notify_change_args args = {
-+		.errp			= &err,
-+		.path			= path,
-+		.ia			= ia,
-+		.delegated_inode	= delegated_inode
-+	};
-+
-+	call_notify_change(&args);
-+
-+	return err;
-+}
-+
-+int vfsub_sio_notify_change(struct path *path, struct iattr *ia,
-+			    struct inode **delegated_inode)
-+{
-+	int err, wkq_err;
-+	struct notify_change_args args = {
-+		.errp			= &err,
-+		.path			= path,
-+		.ia			= ia,
-+		.delegated_inode	= delegated_inode
-+	};
-+
-+	wkq_err = au_wkq_wait(call_notify_change, &args);
-+	if (unlikely(wkq_err))
-+		err = wkq_err;
-+
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+struct unlink_args {
-+	int *errp;
-+	struct inode *dir;
-+	struct path *path;
-+	struct inode **delegated_inode;
-+};
-+
-+static void call_unlink(void *args)
-+{
-+	struct unlink_args *a = args;
-+	struct dentry *d = a->path->dentry;
-+	struct inode *h_inode;
-+	const int stop_sillyrename = (au_test_nfs(d->d_sb)
-+				      && au_dcount(d) == 1);
-+
-+	IMustLock(a->dir);
-+
-+	a->path->dentry = d->d_parent;
-+	*a->errp = security_path_unlink(a->path, d);
-+	a->path->dentry = d;
-+	if (unlikely(*a->errp))
-+		return;
-+
-+	if (!stop_sillyrename)
-+		dget(d);
-+	h_inode = NULL;
-+	if (d_is_positive(d)) {
-+		h_inode = d_inode(d);
-+		ihold(h_inode);
-+	}
-+
-+	lockdep_off();
-+	*a->errp = vfs_unlink(a->dir, d, a->delegated_inode);
-+	lockdep_on();
-+	if (!*a->errp) {
-+		struct path tmp = {
-+			.dentry = d->d_parent,
-+			.mnt	= a->path->mnt
-+		};
-+		vfsub_update_h_iattr(&tmp, /*did*/NULL); /*ignore*/
-+	}
-+
-+	if (!stop_sillyrename)
-+		dput(d);
-+	if (h_inode)
-+		iput(h_inode);
-+
-+	AuTraceErr(*a->errp);
-+}
-+
-+/*
-+ * @dir: must be locked.
-+ * @dentry: target dentry.
-+ */
-+int vfsub_unlink(struct inode *dir, struct path *path,
-+		 struct inode **delegated_inode, int force)
-+{
-+	int err;
-+	struct unlink_args args = {
-+		.errp			= &err,
-+		.dir			= dir,
-+		.path			= path,
-+		.delegated_inode	= delegated_inode
-+	};
-+
-+	if (!force)
-+		call_unlink(&args);
-+	else {
-+		int wkq_err;
-+
-+		wkq_err = au_wkq_wait(call_unlink, &args);
-+		if (unlikely(wkq_err))
-+			err = wkq_err;
-+	}
-+
-+	return err;
-+}
-diff -Nur linux-4.1.10.orig/fs/aufs/vfsub.h linux-4.1.10/fs/aufs/vfsub.h
---- linux-4.1.10.orig/fs/aufs/vfsub.h	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/vfsub.h	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,286 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * sub-routines for VFS
-+ */
-+
-+#ifndef __AUFS_VFSUB_H__
-+#define __AUFS_VFSUB_H__
-+
-+#ifdef __KERNEL__
-+
-+#include <linux/fs.h>
-+#include <linux/mount.h>
-+#include <linux/xattr.h>
-+#include "debug.h"
-+
-+/* copied from linux/fs/internal.h */
-+/* todo: BAD approach!! */
-+extern void __mnt_drop_write(struct vfsmount *);
-+extern spinlock_t inode_sb_list_lock;
-+extern int open_check_o_direct(struct file *f);
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* lock subclass for lower inode */
-+/* default MAX_LOCKDEP_SUBCLASSES(8) is not enough */
-+/* reduce? gave up. */
-+enum {
-+	AuLsc_I_Begin = I_MUTEX_PARENT2, /* 5 */
-+	AuLsc_I_PARENT,		/* lower inode, parent first */
-+	AuLsc_I_PARENT2,	/* copyup dirs */
-+	AuLsc_I_PARENT3,	/* copyup wh */
-+	AuLsc_I_CHILD,
-+	AuLsc_I_CHILD2,
-+	AuLsc_I_End
-+};
-+
-+/* to debug easier, do not make them inlined functions */
-+#define MtxMustLock(mtx)	AuDebugOn(!mutex_is_locked(mtx))
-+#define IMustLock(i)		MtxMustLock(&(i)->i_mutex)
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static inline void vfsub_drop_nlink(struct inode *inode)
-+{
-+	AuDebugOn(!inode->i_nlink);
-+	drop_nlink(inode);
-+}
-+
-+static inline void vfsub_dead_dir(struct inode *inode)
-+{
-+	AuDebugOn(!S_ISDIR(inode->i_mode));
-+	inode->i_flags |= S_DEAD;
-+	clear_nlink(inode);
-+}
-+
-+static inline int vfsub_native_ro(struct inode *inode)
-+{
-+	return (inode->i_sb->s_flags & MS_RDONLY)
-+		|| IS_RDONLY(inode)
-+		/* || IS_APPEND(inode) */
-+		|| IS_IMMUTABLE(inode);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+int vfsub_update_h_iattr(struct path *h_path, int *did);
-+struct file *vfsub_dentry_open(struct path *path, int flags);
-+struct file *vfsub_filp_open(const char *path, int oflags, int mode);
-+struct vfsub_aopen_args {
-+	struct file	*file;
-+	unsigned int	open_flag;
-+	umode_t		create_mode;
-+	int		*opened;
-+};
-+struct au_branch;
-+int vfsub_atomic_open(struct inode *dir, struct dentry *dentry,
-+		      struct vfsub_aopen_args *args, struct au_branch *br);
-+int vfsub_kern_path(const char *name, unsigned int flags, struct path *path);
-+
-+struct dentry *vfsub_lookup_one_len(const char *name, struct dentry *parent,
-+				    int len);
-+
-+struct vfsub_lkup_one_args {
-+	struct dentry **errp;
-+	struct qstr *name;
-+	struct dentry *parent;
-+};
-+
-+static inline struct dentry *vfsub_lkup_one(struct qstr *name,
-+					    struct dentry *parent)
-+{
-+	return vfsub_lookup_one_len(name->name, parent, name->len);
-+}
-+
-+void vfsub_call_lkup_one(void *args);
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static inline int vfsub_mnt_want_write(struct vfsmount *mnt)
-+{
-+	int err;
-+
-+	lockdep_off();
-+	err = mnt_want_write(mnt);
-+	lockdep_on();
-+	return err;
-+}
-+
-+static inline void vfsub_mnt_drop_write(struct vfsmount *mnt)
-+{
-+	lockdep_off();
-+	mnt_drop_write(mnt);
-+	lockdep_on();
-+}
-+
-+#if 0 /* reserved */
-+static inline void vfsub_mnt_drop_write_file(struct file *file)
-+{
-+	lockdep_off();
-+	mnt_drop_write_file(file);
-+	lockdep_on();
-+}
-+#endif
-+
-+/* ---------------------------------------------------------------------- */
-+
-+struct au_hinode;
-+struct dentry *vfsub_lock_rename(struct dentry *d1, struct au_hinode *hdir1,
-+				 struct dentry *d2, struct au_hinode *hdir2);
-+void vfsub_unlock_rename(struct dentry *d1, struct au_hinode *hdir1,
-+			 struct dentry *d2, struct au_hinode *hdir2);
-+
-+int vfsub_create(struct inode *dir, struct path *path, int mode,
-+		 bool want_excl);
-+int vfsub_symlink(struct inode *dir, struct path *path,
-+		  const char *symname);
-+int vfsub_mknod(struct inode *dir, struct path *path, int mode, dev_t dev);
-+int vfsub_link(struct dentry *src_dentry, struct inode *dir,
-+	       struct path *path, struct inode **delegated_inode);
-+int vfsub_rename(struct inode *src_hdir, struct dentry *src_dentry,
-+		 struct inode *hdir, struct path *path,
-+		 struct inode **delegated_inode);
-+int vfsub_mkdir(struct inode *dir, struct path *path, int mode);
-+int vfsub_rmdir(struct inode *dir, struct path *path);
-+
-+/* ---------------------------------------------------------------------- */
-+
-+ssize_t vfsub_read_u(struct file *file, char __user *ubuf, size_t count,
-+		     loff_t *ppos);
-+ssize_t vfsub_read_k(struct file *file, void *kbuf, size_t count,
-+			loff_t *ppos);
-+ssize_t vfsub_write_u(struct file *file, const char __user *ubuf, size_t count,
-+		      loff_t *ppos);
-+ssize_t vfsub_write_k(struct file *file, void *kbuf, size_t count,
-+		      loff_t *ppos);
-+int vfsub_flush(struct file *file, fl_owner_t id);
-+int vfsub_iterate_dir(struct file *file, struct dir_context *ctx);
-+
-+static inline loff_t vfsub_f_size_read(struct file *file)
-+{
-+	return i_size_read(file_inode(file));
-+}
-+
-+static inline unsigned int vfsub_file_flags(struct file *file)
-+{
-+	unsigned int flags;
-+
-+	spin_lock(&file->f_lock);
-+	flags = file->f_flags;
-+	spin_unlock(&file->f_lock);
-+
-+	return flags;
-+}
-+
-+#if 0 /* reserved */
-+static inline void vfsub_file_accessed(struct file *h_file)
-+{
-+	file_accessed(h_file);
-+	vfsub_update_h_iattr(&h_file->f_path, /*did*/NULL); /*ignore*/
-+}
-+#endif
-+
-+static inline void vfsub_touch_atime(struct vfsmount *h_mnt,
-+				     struct dentry *h_dentry)
-+{
-+	struct path h_path = {
-+		.dentry	= h_dentry,
-+		.mnt	= h_mnt
-+	};
-+	touch_atime(&h_path);
-+	vfsub_update_h_iattr(&h_path, /*did*/NULL); /*ignore*/
-+}
-+
-+static inline int vfsub_update_time(struct inode *h_inode, struct timespec *ts,
-+				    int flags)
-+{
-+	return generic_update_time(h_inode, ts, flags);
-+	/* no vfsub_update_h_iattr() since we don't have struct path */
-+}
-+
-+long vfsub_splice_to(struct file *in, loff_t *ppos,
-+		     struct pipe_inode_info *pipe, size_t len,
-+		     unsigned int flags);
-+long vfsub_splice_from(struct pipe_inode_info *pipe, struct file *out,
-+		       loff_t *ppos, size_t len, unsigned int flags);
-+
-+static inline long vfsub_truncate(struct path *path, loff_t length)
-+{
-+	long err;
-+
-+	lockdep_off();
-+	err = vfs_truncate(path, length);
-+	lockdep_on();
-+	return err;
-+}
-+
-+int vfsub_trunc(struct path *h_path, loff_t length, unsigned int attr,
-+		struct file *h_file);
-+int vfsub_fsync(struct file *file, struct path *path, int datasync);
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static inline loff_t vfsub_llseek(struct file *file, loff_t offset, int origin)
-+{
-+	loff_t err;
-+
-+	lockdep_off();
-+	err = vfs_llseek(file, offset, origin);
-+	lockdep_on();
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+int vfsub_sio_mkdir(struct inode *dir, struct path *path, int mode);
-+int vfsub_sio_rmdir(struct inode *dir, struct path *path);
-+int vfsub_sio_notify_change(struct path *path, struct iattr *ia,
-+			    struct inode **delegated_inode);
-+int vfsub_notify_change(struct path *path, struct iattr *ia,
-+			struct inode **delegated_inode);
-+int vfsub_unlink(struct inode *dir, struct path *path,
-+		 struct inode **delegated_inode, int force);
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static inline int vfsub_setxattr(struct dentry *dentry, const char *name,
-+				 const void *value, size_t size, int flags)
-+{
-+	int err;
-+
-+	lockdep_off();
-+	err = vfs_setxattr(dentry, name, value, size, flags);
-+	lockdep_on();
-+
-+	return err;
-+}
-+
-+static inline int vfsub_removexattr(struct dentry *dentry, const char *name)
-+{
-+	int err;
-+
-+	lockdep_off();
-+	err = vfs_removexattr(dentry, name);
-+	lockdep_on();
-+
-+	return err;
-+}
-+
-+#endif /* __KERNEL__ */
-+#endif /* __AUFS_VFSUB_H__ */
-diff -Nur linux-4.1.10.orig/fs/aufs/wbr_policy.c linux-4.1.10/fs/aufs/wbr_policy.c
---- linux-4.1.10.orig/fs/aufs/wbr_policy.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/wbr_policy.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,765 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * policies for selecting one among multiple writable branches
-+ */
-+
-+#include <linux/statfs.h>
-+#include "aufs.h"
-+
-+/* subset of cpup_attr() */
-+static noinline_for_stack
-+int au_cpdown_attr(struct path *h_path, struct dentry *h_src)
-+{
-+	int err, sbits;
-+	struct iattr ia;
-+	struct inode *h_isrc;
-+
-+	h_isrc = d_inode(h_src);
-+	ia.ia_valid = ATTR_FORCE | ATTR_MODE | ATTR_UID | ATTR_GID;
-+	ia.ia_mode = h_isrc->i_mode;
-+	ia.ia_uid = h_isrc->i_uid;
-+	ia.ia_gid = h_isrc->i_gid;
-+	sbits = !!(ia.ia_mode & (S_ISUID | S_ISGID));
-+	au_cpup_attr_flags(d_inode(h_path->dentry), h_isrc->i_flags);
-+	/* no delegation since it is just created */
-+	err = vfsub_sio_notify_change(h_path, &ia, /*delegated*/NULL);
-+
-+	/* is this nfs only? */
-+	if (!err && sbits && au_test_nfs(h_path->dentry->d_sb)) {
-+		ia.ia_valid = ATTR_FORCE | ATTR_MODE;
-+		ia.ia_mode = h_isrc->i_mode;
-+		err = vfsub_sio_notify_change(h_path, &ia, /*delegated*/NULL);
-+	}
-+
-+	return err;
-+}
-+
-+#define AuCpdown_PARENT_OPQ	1
-+#define AuCpdown_WHED		(1 << 1)
-+#define AuCpdown_MADE_DIR	(1 << 2)
-+#define AuCpdown_DIROPQ		(1 << 3)
-+#define au_ftest_cpdown(flags, name)	((flags) & AuCpdown_##name)
-+#define au_fset_cpdown(flags, name) \
-+	do { (flags) |= AuCpdown_##name; } while (0)
-+#define au_fclr_cpdown(flags, name) \
-+	do { (flags) &= ~AuCpdown_##name; } while (0)
-+
-+static int au_cpdown_dir_opq(struct dentry *dentry, aufs_bindex_t bdst,
-+			     unsigned int *flags)
-+{
-+	int err;
-+	struct dentry *opq_dentry;
-+
-+	opq_dentry = au_diropq_create(dentry, bdst);
-+	err = PTR_ERR(opq_dentry);
-+	if (IS_ERR(opq_dentry))
-+		goto out;
-+	dput(opq_dentry);
-+	au_fset_cpdown(*flags, DIROPQ);
-+
-+out:
-+	return err;
-+}
-+
-+static int au_cpdown_dir_wh(struct dentry *dentry, struct dentry *h_parent,
-+			    struct inode *dir, aufs_bindex_t bdst)
-+{
-+	int err;
-+	struct path h_path;
-+	struct au_branch *br;
-+
-+	br = au_sbr(dentry->d_sb, bdst);
-+	h_path.dentry = au_wh_lkup(h_parent, &dentry->d_name, br);
-+	err = PTR_ERR(h_path.dentry);
-+	if (IS_ERR(h_path.dentry))
-+		goto out;
-+
-+	err = 0;
-+	if (d_is_positive(h_path.dentry)) {
-+		h_path.mnt = au_br_mnt(br);
-+		err = au_wh_unlink_dentry(au_h_iptr(dir, bdst), &h_path,
-+					  dentry);
-+	}
-+	dput(h_path.dentry);
-+
-+out:
-+	return err;
-+}
-+
-+static int au_cpdown_dir(struct dentry *dentry, aufs_bindex_t bdst,
-+			 struct au_pin *pin,
-+			 struct dentry *h_parent, void *arg)
-+{
-+	int err, rerr;
-+	aufs_bindex_t bopq, bstart;
-+	struct path h_path;
-+	struct dentry *parent;
-+	struct inode *h_dir, *h_inode, *inode, *dir;
-+	unsigned int *flags = arg;
-+
-+	bstart = au_dbstart(dentry);
-+	/* dentry is di-locked */
-+	parent = dget_parent(dentry);
-+	dir = d_inode(parent);
-+	h_dir = d_inode(h_parent);
-+	AuDebugOn(h_dir != au_h_iptr(dir, bdst));
-+	IMustLock(h_dir);
-+
-+	err = au_lkup_neg(dentry, bdst, /*wh*/0);
-+	if (unlikely(err < 0))
-+		goto out;
-+	h_path.dentry = au_h_dptr(dentry, bdst);
-+	h_path.mnt = au_sbr_mnt(dentry->d_sb, bdst);
-+	err = vfsub_sio_mkdir(au_h_iptr(dir, bdst), &h_path,
-+			      S_IRWXU | S_IRUGO | S_IXUGO);
-+	if (unlikely(err))
-+		goto out_put;
-+	au_fset_cpdown(*flags, MADE_DIR);
-+
-+	bopq = au_dbdiropq(dentry);
-+	au_fclr_cpdown(*flags, WHED);
-+	au_fclr_cpdown(*flags, DIROPQ);
-+	if (au_dbwh(dentry) == bdst)
-+		au_fset_cpdown(*flags, WHED);
-+	if (!au_ftest_cpdown(*flags, PARENT_OPQ) && bopq <= bdst)
-+		au_fset_cpdown(*flags, PARENT_OPQ);
-+	h_inode = d_inode(h_path.dentry);
-+	mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
-+	if (au_ftest_cpdown(*flags, WHED)) {
-+		err = au_cpdown_dir_opq(dentry, bdst, flags);
-+		if (unlikely(err)) {
-+			mutex_unlock(&h_inode->i_mutex);
-+			goto out_dir;
-+		}
-+	}
-+
-+	err = au_cpdown_attr(&h_path, au_h_dptr(dentry, bstart));
-+	mutex_unlock(&h_inode->i_mutex);
-+	if (unlikely(err))
-+		goto out_opq;
-+
-+	if (au_ftest_cpdown(*flags, WHED)) {
-+		err = au_cpdown_dir_wh(dentry, h_parent, dir, bdst);
-+		if (unlikely(err))
-+			goto out_opq;
-+	}
-+
-+	inode = d_inode(dentry);
-+	if (au_ibend(inode) < bdst)
-+		au_set_ibend(inode, bdst);
-+	au_set_h_iptr(inode, bdst, au_igrab(h_inode),
-+		      au_hi_flags(inode, /*isdir*/1));
-+	au_fhsm_wrote(dentry->d_sb, bdst, /*force*/0);
-+	goto out; /* success */
-+
-+	/* revert */
-+out_opq:
-+	if (au_ftest_cpdown(*flags, DIROPQ)) {
-+		mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
-+		rerr = au_diropq_remove(dentry, bdst);
-+		mutex_unlock(&h_inode->i_mutex);
-+		if (unlikely(rerr)) {
-+			AuIOErr("failed removing diropq for %pd b%d (%d)\n",
-+				dentry, bdst, rerr);
-+			err = -EIO;
-+			goto out;
-+		}
-+	}
-+out_dir:
-+	if (au_ftest_cpdown(*flags, MADE_DIR)) {
-+		rerr = vfsub_sio_rmdir(au_h_iptr(dir, bdst), &h_path);
-+		if (unlikely(rerr)) {
-+			AuIOErr("failed removing %pd b%d (%d)\n",
-+				dentry, bdst, rerr);
-+			err = -EIO;
-+		}
-+	}
-+out_put:
-+	au_set_h_dptr(dentry, bdst, NULL);
-+	if (au_dbend(dentry) == bdst)
-+		au_update_dbend(dentry);
-+out:
-+	dput(parent);
-+	return err;
-+}
-+
-+int au_cpdown_dirs(struct dentry *dentry, aufs_bindex_t bdst)
-+{
-+	int err;
-+	unsigned int flags;
-+
-+	flags = 0;
-+	err = au_cp_dirs(dentry, bdst, au_cpdown_dir, &flags);
-+
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* policies for create */
-+
-+int au_wbr_nonopq(struct dentry *dentry, aufs_bindex_t bindex)
-+{
-+	int err, i, j, ndentry;
-+	aufs_bindex_t bopq;
-+	struct au_dcsub_pages dpages;
-+	struct au_dpage *dpage;
-+	struct dentry **dentries, *parent, *d;
-+
-+	err = au_dpages_init(&dpages, GFP_NOFS);
-+	if (unlikely(err))
-+		goto out;
-+	parent = dget_parent(dentry);
-+	err = au_dcsub_pages_rev_aufs(&dpages, parent, /*do_include*/0);
-+	if (unlikely(err))
-+		goto out_free;
-+
-+	err = bindex;
-+	for (i = 0; i < dpages.ndpage; i++) {
-+		dpage = dpages.dpages + i;
-+		dentries = dpage->dentries;
-+		ndentry = dpage->ndentry;
-+		for (j = 0; j < ndentry; j++) {
-+			d = dentries[j];
-+			di_read_lock_parent2(d, !AuLock_IR);
-+			bopq = au_dbdiropq(d);
-+			di_read_unlock(d, !AuLock_IR);
-+			if (bopq >= 0 && bopq < err)
-+				err = bopq;
-+		}
-+	}
-+
-+out_free:
-+	dput(parent);
-+	au_dpages_free(&dpages);
-+out:
-+	return err;
-+}
-+
-+static int au_wbr_bu(struct super_block *sb, aufs_bindex_t bindex)
-+{
-+	for (; bindex >= 0; bindex--)
-+		if (!au_br_rdonly(au_sbr(sb, bindex)))
-+			return bindex;
-+	return -EROFS;
-+}
-+
-+/* top down parent */
-+static int au_wbr_create_tdp(struct dentry *dentry,
-+			     unsigned int flags __maybe_unused)
-+{
-+	int err;
-+	aufs_bindex_t bstart, bindex;
-+	struct super_block *sb;
-+	struct dentry *parent, *h_parent;
-+
-+	sb = dentry->d_sb;
-+	bstart = au_dbstart(dentry);
-+	err = bstart;
-+	if (!au_br_rdonly(au_sbr(sb, bstart)))
-+		goto out;
-+
-+	err = -EROFS;
-+	parent = dget_parent(dentry);
-+	for (bindex = au_dbstart(parent); bindex < bstart; bindex++) {
-+		h_parent = au_h_dptr(parent, bindex);
-+		if (!h_parent || d_is_negative(h_parent))
-+			continue;
-+
-+		if (!au_br_rdonly(au_sbr(sb, bindex))) {
-+			err = bindex;
-+			break;
-+		}
-+	}
-+	dput(parent);
-+
-+	/* bottom up here */
-+	if (unlikely(err < 0)) {
-+		err = au_wbr_bu(sb, bstart - 1);
-+		if (err >= 0)
-+			err = au_wbr_nonopq(dentry, err);
-+	}
-+
-+out:
-+	AuDbg("b%d\n", err);
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* an exception for the policy other than tdp */
-+static int au_wbr_create_exp(struct dentry *dentry)
-+{
-+	int err;
-+	aufs_bindex_t bwh, bdiropq;
-+	struct dentry *parent;
-+
-+	err = -1;
-+	bwh = au_dbwh(dentry);
-+	parent = dget_parent(dentry);
-+	bdiropq = au_dbdiropq(parent);
-+	if (bwh >= 0) {
-+		if (bdiropq >= 0)
-+			err = min(bdiropq, bwh);
-+		else
-+			err = bwh;
-+		AuDbg("%d\n", err);
-+	} else if (bdiropq >= 0) {
-+		err = bdiropq;
-+		AuDbg("%d\n", err);
-+	}
-+	dput(parent);
-+
-+	if (err >= 0)
-+		err = au_wbr_nonopq(dentry, err);
-+
-+	if (err >= 0 && au_br_rdonly(au_sbr(dentry->d_sb, err)))
-+		err = -1;
-+
-+	AuDbg("%d\n", err);
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* round robin */
-+static int au_wbr_create_init_rr(struct super_block *sb)
-+{
-+	int err;
-+
-+	err = au_wbr_bu(sb, au_sbend(sb));
-+	atomic_set(&au_sbi(sb)->si_wbr_rr_next, -err); /* less important */
-+	/* smp_mb(); */
-+
-+	AuDbg("b%d\n", err);
-+	return err;
-+}
-+
-+static int au_wbr_create_rr(struct dentry *dentry, unsigned int flags)
-+{
-+	int err, nbr;
-+	unsigned int u;
-+	aufs_bindex_t bindex, bend;
-+	struct super_block *sb;
-+	atomic_t *next;
-+
-+	err = au_wbr_create_exp(dentry);
-+	if (err >= 0)
-+		goto out;
-+
-+	sb = dentry->d_sb;
-+	next = &au_sbi(sb)->si_wbr_rr_next;
-+	bend = au_sbend(sb);
-+	nbr = bend + 1;
-+	for (bindex = 0; bindex <= bend; bindex++) {
-+		if (!au_ftest_wbr(flags, DIR)) {
-+			err = atomic_dec_return(next) + 1;
-+			/* modulo for 0 is meaningless */
-+			if (unlikely(!err))
-+				err = atomic_dec_return(next) + 1;
-+		} else
-+			err = atomic_read(next);
-+		AuDbg("%d\n", err);
-+		u = err;
-+		err = u % nbr;
-+		AuDbg("%d\n", err);
-+		if (!au_br_rdonly(au_sbr(sb, err)))
-+			break;
-+		err = -EROFS;
-+	}
-+
-+	if (err >= 0)
-+		err = au_wbr_nonopq(dentry, err);
-+
-+out:
-+	AuDbg("%d\n", err);
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* most free space */
-+static void au_mfs(struct dentry *dentry, struct dentry *parent)
-+{
-+	struct super_block *sb;
-+	struct au_branch *br;
-+	struct au_wbr_mfs *mfs;
-+	struct dentry *h_parent;
-+	aufs_bindex_t bindex, bend;
-+	int err;
-+	unsigned long long b, bavail;
-+	struct path h_path;
-+	/* reduce the stack usage */
-+	struct kstatfs *st;
-+
-+	st = kmalloc(sizeof(*st), GFP_NOFS);
-+	if (unlikely(!st)) {
-+		AuWarn1("failed updating mfs(%d), ignored\n", -ENOMEM);
-+		return;
-+	}
-+
-+	bavail = 0;
-+	sb = dentry->d_sb;
-+	mfs = &au_sbi(sb)->si_wbr_mfs;
-+	MtxMustLock(&mfs->mfs_lock);
-+	mfs->mfs_bindex = -EROFS;
-+	mfs->mfsrr_bytes = 0;
-+	if (!parent) {
-+		bindex = 0;
-+		bend = au_sbend(sb);
-+	} else {
-+		bindex = au_dbstart(parent);
-+		bend = au_dbtaildir(parent);
-+	}
-+
-+	for (; bindex <= bend; bindex++) {
-+		if (parent) {
-+			h_parent = au_h_dptr(parent, bindex);
-+			if (!h_parent || d_is_negative(h_parent))
-+				continue;
-+		}
-+		br = au_sbr(sb, bindex);
-+		if (au_br_rdonly(br))
-+			continue;
-+
-+		/* sb->s_root for NFS is unreliable */
-+		h_path.mnt = au_br_mnt(br);
-+		h_path.dentry = h_path.mnt->mnt_root;
-+		err = vfs_statfs(&h_path, st);
-+		if (unlikely(err)) {
-+			AuWarn1("failed statfs, b%d, %d\n", bindex, err);
-+			continue;
-+		}
-+
-+		/* when the available size is equal, select the lower one */
-+		BUILD_BUG_ON(sizeof(b) < sizeof(st->f_bavail)
-+			     || sizeof(b) < sizeof(st->f_bsize));
-+		b = st->f_bavail * st->f_bsize;
-+		br->br_wbr->wbr_bytes = b;
-+		if (b >= bavail) {
-+			bavail = b;
-+			mfs->mfs_bindex = bindex;
-+			mfs->mfs_jiffy = jiffies;
-+		}
-+	}
-+
-+	mfs->mfsrr_bytes = bavail;
-+	AuDbg("b%d\n", mfs->mfs_bindex);
-+	kfree(st);
-+}
-+
-+static int au_wbr_create_mfs(struct dentry *dentry, unsigned int flags)
-+{
-+	int err;
-+	struct dentry *parent;
-+	struct super_block *sb;
-+	struct au_wbr_mfs *mfs;
-+
-+	err = au_wbr_create_exp(dentry);
-+	if (err >= 0)
-+		goto out;
-+
-+	sb = dentry->d_sb;
-+	parent = NULL;
-+	if (au_ftest_wbr(flags, PARENT))
-+		parent = dget_parent(dentry);
-+	mfs = &au_sbi(sb)->si_wbr_mfs;
-+	mutex_lock(&mfs->mfs_lock);
-+	if (time_after(jiffies, mfs->mfs_jiffy + mfs->mfs_expire)
-+	    || mfs->mfs_bindex < 0
-+	    || au_br_rdonly(au_sbr(sb, mfs->mfs_bindex)))
-+		au_mfs(dentry, parent);
-+	mutex_unlock(&mfs->mfs_lock);
-+	err = mfs->mfs_bindex;
-+	dput(parent);
-+
-+	if (err >= 0)
-+		err = au_wbr_nonopq(dentry, err);
-+
-+out:
-+	AuDbg("b%d\n", err);
-+	return err;
-+}
-+
-+static int au_wbr_create_init_mfs(struct super_block *sb)
-+{
-+	struct au_wbr_mfs *mfs;
-+
-+	mfs = &au_sbi(sb)->si_wbr_mfs;
-+	mutex_init(&mfs->mfs_lock);
-+	mfs->mfs_jiffy = 0;
-+	mfs->mfs_bindex = -EROFS;
-+
-+	return 0;
-+}
-+
-+static int au_wbr_create_fin_mfs(struct super_block *sb __maybe_unused)
-+{
-+	mutex_destroy(&au_sbi(sb)->si_wbr_mfs.mfs_lock);
-+	return 0;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* most free space and then round robin */
-+static int au_wbr_create_mfsrr(struct dentry *dentry, unsigned int flags)
-+{
-+	int err;
-+	struct au_wbr_mfs *mfs;
-+
-+	err = au_wbr_create_mfs(dentry, flags);
-+	if (err >= 0) {
-+		mfs = &au_sbi(dentry->d_sb)->si_wbr_mfs;
-+		mutex_lock(&mfs->mfs_lock);
-+		if (mfs->mfsrr_bytes < mfs->mfsrr_watermark)
-+			err = au_wbr_create_rr(dentry, flags);
-+		mutex_unlock(&mfs->mfs_lock);
-+	}
-+
-+	AuDbg("b%d\n", err);
-+	return err;
-+}
-+
-+static int au_wbr_create_init_mfsrr(struct super_block *sb)
-+{
-+	int err;
-+
-+	au_wbr_create_init_mfs(sb); /* ignore */
-+	err = au_wbr_create_init_rr(sb);
-+
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* top down parent and most free space */
-+static int au_wbr_create_pmfs(struct dentry *dentry, unsigned int flags)
-+{
-+	int err, e2;
-+	unsigned long long b;
-+	aufs_bindex_t bindex, bstart, bend;
-+	struct super_block *sb;
-+	struct dentry *parent, *h_parent;
-+	struct au_branch *br;
-+
-+	err = au_wbr_create_tdp(dentry, flags);
-+	if (unlikely(err < 0))
-+		goto out;
-+	parent = dget_parent(dentry);
-+	bstart = au_dbstart(parent);
-+	bend = au_dbtaildir(parent);
-+	if (bstart == bend)
-+		goto out_parent; /* success */
-+
-+	e2 = au_wbr_create_mfs(dentry, flags);
-+	if (e2 < 0)
-+		goto out_parent; /* success */
-+
-+	/* when the available size is equal, select upper one */
-+	sb = dentry->d_sb;
-+	br = au_sbr(sb, err);
-+	b = br->br_wbr->wbr_bytes;
-+	AuDbg("b%d, %llu\n", err, b);
-+
-+	for (bindex = bstart; bindex <= bend; bindex++) {
-+		h_parent = au_h_dptr(parent, bindex);
-+		if (!h_parent || d_is_negative(h_parent))
-+			continue;
-+
-+		br = au_sbr(sb, bindex);
-+		if (!au_br_rdonly(br) && br->br_wbr->wbr_bytes > b) {
-+			b = br->br_wbr->wbr_bytes;
-+			err = bindex;
-+			AuDbg("b%d, %llu\n", err, b);
-+		}
-+	}
-+
-+	if (err >= 0)
-+		err = au_wbr_nonopq(dentry, err);
-+
-+out_parent:
-+	dput(parent);
-+out:
-+	AuDbg("b%d\n", err);
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/*
-+ * - top down parent
-+ * - most free space with parent
-+ * - most free space round-robin regardless parent
-+ */
-+static int au_wbr_create_pmfsrr(struct dentry *dentry, unsigned int flags)
-+{
-+	int err;
-+	unsigned long long watermark;
-+	struct super_block *sb;
-+	struct au_branch *br;
-+	struct au_wbr_mfs *mfs;
-+
-+	err = au_wbr_create_pmfs(dentry, flags | AuWbr_PARENT);
-+	if (unlikely(err < 0))
-+		goto out;
-+
-+	sb = dentry->d_sb;
-+	br = au_sbr(sb, err);
-+	mfs = &au_sbi(sb)->si_wbr_mfs;
-+	mutex_lock(&mfs->mfs_lock);
-+	watermark = mfs->mfsrr_watermark;
-+	mutex_unlock(&mfs->mfs_lock);
-+	if (br->br_wbr->wbr_bytes < watermark)
-+		/* regardless the parent dir */
-+		err = au_wbr_create_mfsrr(dentry, flags);
-+
-+out:
-+	AuDbg("b%d\n", err);
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* policies for copyup */
-+
-+/* top down parent */
-+static int au_wbr_copyup_tdp(struct dentry *dentry)
-+{
-+	return au_wbr_create_tdp(dentry, /*flags, anything is ok*/0);
-+}
-+
-+/* bottom up parent */
-+static int au_wbr_copyup_bup(struct dentry *dentry)
-+{
-+	int err;
-+	aufs_bindex_t bindex, bstart;
-+	struct dentry *parent, *h_parent;
-+	struct super_block *sb;
-+
-+	err = -EROFS;
-+	sb = dentry->d_sb;
-+	parent = dget_parent(dentry);
-+	bstart = au_dbstart(parent);
-+	for (bindex = au_dbstart(dentry); bindex >= bstart; bindex--) {
-+		h_parent = au_h_dptr(parent, bindex);
-+		if (!h_parent || d_is_negative(h_parent))
-+			continue;
-+
-+		if (!au_br_rdonly(au_sbr(sb, bindex))) {
-+			err = bindex;
-+			break;
-+		}
-+	}
-+	dput(parent);
-+
-+	/* bottom up here */
-+	if (unlikely(err < 0))
-+		err = au_wbr_bu(sb, bstart - 1);
-+
-+	AuDbg("b%d\n", err);
-+	return err;
-+}
-+
-+/* bottom up */
-+int au_wbr_do_copyup_bu(struct dentry *dentry, aufs_bindex_t bstart)
-+{
-+	int err;
-+
-+	err = au_wbr_bu(dentry->d_sb, bstart);
-+	AuDbg("b%d\n", err);
-+	if (err > bstart)
-+		err = au_wbr_nonopq(dentry, err);
-+
-+	AuDbg("b%d\n", err);
-+	return err;
-+}
-+
-+static int au_wbr_copyup_bu(struct dentry *dentry)
-+{
-+	int err;
-+	aufs_bindex_t bstart;
-+
-+	bstart = au_dbstart(dentry);
-+	err = au_wbr_do_copyup_bu(dentry, bstart);
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+struct au_wbr_copyup_operations au_wbr_copyup_ops[] = {
-+	[AuWbrCopyup_TDP] = {
-+		.copyup	= au_wbr_copyup_tdp
-+	},
-+	[AuWbrCopyup_BUP] = {
-+		.copyup	= au_wbr_copyup_bup
-+	},
-+	[AuWbrCopyup_BU] = {
-+		.copyup	= au_wbr_copyup_bu
-+	}
-+};
-+
-+struct au_wbr_create_operations au_wbr_create_ops[] = {
-+	[AuWbrCreate_TDP] = {
-+		.create	= au_wbr_create_tdp
-+	},
-+	[AuWbrCreate_RR] = {
-+		.create	= au_wbr_create_rr,
-+		.init	= au_wbr_create_init_rr
-+	},
-+	[AuWbrCreate_MFS] = {
-+		.create	= au_wbr_create_mfs,
-+		.init	= au_wbr_create_init_mfs,
-+		.fin	= au_wbr_create_fin_mfs
-+	},
-+	[AuWbrCreate_MFSV] = {
-+		.create	= au_wbr_create_mfs,
-+		.init	= au_wbr_create_init_mfs,
-+		.fin	= au_wbr_create_fin_mfs
-+	},
-+	[AuWbrCreate_MFSRR] = {
-+		.create	= au_wbr_create_mfsrr,
-+		.init	= au_wbr_create_init_mfsrr,
-+		.fin	= au_wbr_create_fin_mfs
-+	},
-+	[AuWbrCreate_MFSRRV] = {
-+		.create	= au_wbr_create_mfsrr,
-+		.init	= au_wbr_create_init_mfsrr,
-+		.fin	= au_wbr_create_fin_mfs
-+	},
-+	[AuWbrCreate_PMFS] = {
-+		.create	= au_wbr_create_pmfs,
-+		.init	= au_wbr_create_init_mfs,
-+		.fin	= au_wbr_create_fin_mfs
-+	},
-+	[AuWbrCreate_PMFSV] = {
-+		.create	= au_wbr_create_pmfs,
-+		.init	= au_wbr_create_init_mfs,
-+		.fin	= au_wbr_create_fin_mfs
-+	},
-+	[AuWbrCreate_PMFSRR] = {
-+		.create	= au_wbr_create_pmfsrr,
-+		.init	= au_wbr_create_init_mfsrr,
-+		.fin	= au_wbr_create_fin_mfs
-+	},
-+	[AuWbrCreate_PMFSRRV] = {
-+		.create	= au_wbr_create_pmfsrr,
-+		.init	= au_wbr_create_init_mfsrr,
-+		.fin	= au_wbr_create_fin_mfs
-+	}
-+};
-diff -Nur linux-4.1.10.orig/fs/aufs/whout.c linux-4.1.10/fs/aufs/whout.c
---- linux-4.1.10.orig/fs/aufs/whout.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/whout.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,1063 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * whiteout for logical deletion and opaque directory
-+ */
-+
-+#include "aufs.h"
-+
-+#define WH_MASK			S_IRUGO
-+
-+/*
-+ * If a directory contains this file, then it is opaque.  We start with the
-+ * .wh. flag so that it is blocked by lookup.
-+ */
-+static struct qstr diropq_name = QSTR_INIT(AUFS_WH_DIROPQ,
-+					   sizeof(AUFS_WH_DIROPQ) - 1);
-+
-+/*
-+ * generate whiteout name, which is NOT terminated by NULL.
-+ * @name: original d_name.name
-+ * @len: original d_name.len
-+ * @wh: whiteout qstr
-+ * returns zero when succeeds, otherwise error.
-+ * succeeded value as wh->name should be freed by kfree().
-+ */
-+int au_wh_name_alloc(struct qstr *wh, const struct qstr *name)
-+{
-+	char *p;
-+
-+	if (unlikely(name->len > PATH_MAX - AUFS_WH_PFX_LEN))
-+		return -ENAMETOOLONG;
-+
-+	wh->len = name->len + AUFS_WH_PFX_LEN;
-+	p = kmalloc(wh->len, GFP_NOFS);
-+	wh->name = p;
-+	if (p) {
-+		memcpy(p, AUFS_WH_PFX, AUFS_WH_PFX_LEN);
-+		memcpy(p + AUFS_WH_PFX_LEN, name->name, name->len);
-+		/* smp_mb(); */
-+		return 0;
-+	}
-+	return -ENOMEM;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/*
-+ * test if the @wh_name exists under @h_parent.
-+ * @try_sio specifies the necessary of super-io.
-+ */
-+int au_wh_test(struct dentry *h_parent, struct qstr *wh_name, int try_sio)
-+{
-+	int err;
-+	struct dentry *wh_dentry;
-+
-+	if (!try_sio)
-+		wh_dentry = vfsub_lkup_one(wh_name, h_parent);
-+	else
-+		wh_dentry = au_sio_lkup_one(wh_name, h_parent);
-+	err = PTR_ERR(wh_dentry);
-+	if (IS_ERR(wh_dentry)) {
-+		if (err == -ENAMETOOLONG)
-+			err = 0;
-+		goto out;
-+	}
-+
-+	err = 0;
-+	if (d_is_negative(wh_dentry))
-+		goto out_wh; /* success */
-+
-+	err = 1;
-+	if (d_is_reg(wh_dentry))
-+		goto out_wh; /* success */
-+
-+	err = -EIO;
-+	AuIOErr("%pd Invalid whiteout entry type 0%o.\n",
-+		wh_dentry, d_inode(wh_dentry)->i_mode);
-+
-+out_wh:
-+	dput(wh_dentry);
-+out:
-+	return err;
-+}
-+
-+/*
-+ * test if the @h_dentry sets opaque or not.
-+ */
-+int au_diropq_test(struct dentry *h_dentry)
-+{
-+	int err;
-+	struct inode *h_dir;
-+
-+	h_dir = d_inode(h_dentry);
-+	err = au_wh_test(h_dentry, &diropq_name,
-+			 au_test_h_perm_sio(h_dir, MAY_EXEC));
-+	return err;
-+}
-+
-+/*
-+ * returns a negative dentry whose name is unique and temporary.
-+ */
-+struct dentry *au_whtmp_lkup(struct dentry *h_parent, struct au_branch *br,
-+			     struct qstr *prefix)
-+{
-+	struct dentry *dentry;
-+	int i;
-+	char defname[NAME_MAX - AUFS_MAX_NAMELEN + DNAME_INLINE_LEN + 1],
-+		*name, *p;
-+	/* strict atomic_t is unnecessary here */
-+	static unsigned short cnt;
-+	struct qstr qs;
-+
-+	BUILD_BUG_ON(sizeof(cnt) * 2 > AUFS_WH_TMP_LEN);
-+
-+	name = defname;
-+	qs.len = sizeof(defname) - DNAME_INLINE_LEN + prefix->len - 1;
-+	if (unlikely(prefix->len > DNAME_INLINE_LEN)) {
-+		dentry = ERR_PTR(-ENAMETOOLONG);
-+		if (unlikely(qs.len > NAME_MAX))
-+			goto out;
-+		dentry = ERR_PTR(-ENOMEM);
-+		name = kmalloc(qs.len + 1, GFP_NOFS);
-+		if (unlikely(!name))
-+			goto out;
-+	}
-+
-+	/* doubly whiteout-ed */
-+	memcpy(name, AUFS_WH_PFX AUFS_WH_PFX, AUFS_WH_PFX_LEN * 2);
-+	p = name + AUFS_WH_PFX_LEN * 2;
-+	memcpy(p, prefix->name, prefix->len);
-+	p += prefix->len;
-+	*p++ = '.';
-+	AuDebugOn(name + qs.len + 1 - p <= AUFS_WH_TMP_LEN);
-+
-+	qs.name = name;
-+	for (i = 0; i < 3; i++) {
-+		sprintf(p, "%.*x", AUFS_WH_TMP_LEN, cnt++);
-+		dentry = au_sio_lkup_one(&qs, h_parent);
-+		if (IS_ERR(dentry) || d_is_negative(dentry))
-+			goto out_name;
-+		dput(dentry);
-+	}
-+	/* pr_warn("could not get random name\n"); */
-+	dentry = ERR_PTR(-EEXIST);
-+	AuDbg("%.*s\n", AuLNPair(&qs));
-+	BUG();
-+
-+out_name:
-+	if (name != defname)
-+		kfree(name);
-+out:
-+	AuTraceErrPtr(dentry);
-+	return dentry;
-+}
-+
-+/*
-+ * rename the @h_dentry on @br to the whiteouted temporary name.
-+ */
-+int au_whtmp_ren(struct dentry *h_dentry, struct au_branch *br)
-+{
-+	int err;
-+	struct path h_path = {
-+		.mnt = au_br_mnt(br)
-+	};
-+	struct inode *h_dir, *delegated;
-+	struct dentry *h_parent;
-+
-+	h_parent = h_dentry->d_parent; /* dir inode is locked */
-+	h_dir = d_inode(h_parent);
-+	IMustLock(h_dir);
-+
-+	h_path.dentry = au_whtmp_lkup(h_parent, br, &h_dentry->d_name);
-+	err = PTR_ERR(h_path.dentry);
-+	if (IS_ERR(h_path.dentry))
-+		goto out;
-+
-+	/* under the same dir, no need to lock_rename() */
-+	delegated = NULL;
-+	err = vfsub_rename(h_dir, h_dentry, h_dir, &h_path, &delegated);
-+	AuTraceErr(err);
-+	if (unlikely(err == -EWOULDBLOCK)) {
-+		pr_warn("cannot retry for NFSv4 delegation"
-+			" for an internal rename\n");
-+		iput(delegated);
-+	}
-+	dput(h_path.dentry);
-+
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+/*
-+ * functions for removing a whiteout
-+ */
-+
-+static int do_unlink_wh(struct inode *h_dir, struct path *h_path)
-+{
-+	int err, force;
-+	struct inode *delegated;
-+
-+	/*
-+	 * forces superio when the dir has a sticky bit.
-+	 * this may be a violation of unix fs semantics.
-+	 */
-+	force = (h_dir->i_mode & S_ISVTX)
-+		&& !uid_eq(current_fsuid(), d_inode(h_path->dentry)->i_uid);
-+	delegated = NULL;
-+	err = vfsub_unlink(h_dir, h_path, &delegated, force);
-+	if (unlikely(err == -EWOULDBLOCK)) {
-+		pr_warn("cannot retry for NFSv4 delegation"
-+			" for an internal unlink\n");
-+		iput(delegated);
-+	}
-+	return err;
-+}
-+
-+int au_wh_unlink_dentry(struct inode *h_dir, struct path *h_path,
-+			struct dentry *dentry)
-+{
-+	int err;
-+
-+	err = do_unlink_wh(h_dir, h_path);
-+	if (!err && dentry)
-+		au_set_dbwh(dentry, -1);
-+
-+	return err;
-+}
-+
-+static int unlink_wh_name(struct dentry *h_parent, struct qstr *wh,
-+			  struct au_branch *br)
-+{
-+	int err;
-+	struct path h_path = {
-+		.mnt = au_br_mnt(br)
-+	};
-+
-+	err = 0;
-+	h_path.dentry = vfsub_lkup_one(wh, h_parent);
-+	if (IS_ERR(h_path.dentry))
-+		err = PTR_ERR(h_path.dentry);
-+	else {
-+		if (d_is_reg(h_path.dentry))
-+			err = do_unlink_wh(d_inode(h_parent), &h_path);
-+		dput(h_path.dentry);
-+	}
-+
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+/*
-+ * initialize/clean whiteout for a branch
-+ */
-+
-+static void au_wh_clean(struct inode *h_dir, struct path *whpath,
-+			const int isdir)
-+{
-+	int err;
-+	struct inode *delegated;
-+
-+	if (d_is_negative(whpath->dentry))
-+		return;
-+
-+	if (isdir)
-+		err = vfsub_rmdir(h_dir, whpath);
-+	else {
-+		delegated = NULL;
-+		err = vfsub_unlink(h_dir, whpath, &delegated, /*force*/0);
-+		if (unlikely(err == -EWOULDBLOCK)) {
-+			pr_warn("cannot retry for NFSv4 delegation"
-+				" for an internal unlink\n");
-+			iput(delegated);
-+		}
-+	}
-+	if (unlikely(err))
-+		pr_warn("failed removing %pd (%d), ignored.\n",
-+			whpath->dentry, err);
-+}
-+
-+static int test_linkable(struct dentry *h_root)
-+{
-+	struct inode *h_dir = d_inode(h_root);
-+
-+	if (h_dir->i_op->link)
-+		return 0;
-+
-+	pr_err("%pd (%s) doesn't support link(2), use noplink and rw+nolwh\n",
-+	       h_root, au_sbtype(h_root->d_sb));
-+	return -ENOSYS;
-+}
-+
-+/* todo: should this mkdir be done in /sbin/mount.aufs helper? */
-+static int au_whdir(struct inode *h_dir, struct path *path)
-+{
-+	int err;
-+
-+	err = -EEXIST;
-+	if (d_is_negative(path->dentry)) {
-+		int mode = S_IRWXU;
-+
-+		if (au_test_nfs(path->dentry->d_sb))
-+			mode |= S_IXUGO;
-+		err = vfsub_mkdir(h_dir, path, mode);
-+	} else if (d_is_dir(path->dentry))
-+		err = 0;
-+	else
-+		pr_err("unknown %pd exists\n", path->dentry);
-+
-+	return err;
-+}
-+
-+struct au_wh_base {
-+	const struct qstr *name;
-+	struct dentry *dentry;
-+};
-+
-+static void au_wh_init_ro(struct inode *h_dir, struct au_wh_base base[],
-+			  struct path *h_path)
-+{
-+	h_path->dentry = base[AuBrWh_BASE].dentry;
-+	au_wh_clean(h_dir, h_path, /*isdir*/0);
-+	h_path->dentry = base[AuBrWh_PLINK].dentry;
-+	au_wh_clean(h_dir, h_path, /*isdir*/1);
-+	h_path->dentry = base[AuBrWh_ORPH].dentry;
-+	au_wh_clean(h_dir, h_path, /*isdir*/1);
-+}
-+
-+/*
-+ * returns tri-state,
-+ * minus: error, caller should print the message
-+ * zero: succuess
-+ * plus: error, caller should NOT print the message
-+ */
-+static int au_wh_init_rw_nolink(struct dentry *h_root, struct au_wbr *wbr,
-+				int do_plink, struct au_wh_base base[],
-+				struct path *h_path)
-+{
-+	int err;
-+	struct inode *h_dir;
-+
-+	h_dir = d_inode(h_root);
-+	h_path->dentry = base[AuBrWh_BASE].dentry;
-+	au_wh_clean(h_dir, h_path, /*isdir*/0);
-+	h_path->dentry = base[AuBrWh_PLINK].dentry;
-+	if (do_plink) {
-+		err = test_linkable(h_root);
-+		if (unlikely(err)) {
-+			err = 1;
-+			goto out;
-+		}
-+
-+		err = au_whdir(h_dir, h_path);
-+		if (unlikely(err))
-+			goto out;
-+		wbr->wbr_plink = dget(base[AuBrWh_PLINK].dentry);
-+	} else
-+		au_wh_clean(h_dir, h_path, /*isdir*/1);
-+	h_path->dentry = base[AuBrWh_ORPH].dentry;
-+	err = au_whdir(h_dir, h_path);
-+	if (unlikely(err))
-+		goto out;
-+	wbr->wbr_orph = dget(base[AuBrWh_ORPH].dentry);
-+
-+out:
-+	return err;
-+}
-+
-+/*
-+ * for the moment, aufs supports the branch filesystem which does not support
-+ * link(2). testing on FAT which does not support i_op->setattr() fully either,
-+ * copyup failed. finally, such filesystem will not be used as the writable
-+ * branch.
-+ *
-+ * returns tri-state, see above.
-+ */
-+static int au_wh_init_rw(struct dentry *h_root, struct au_wbr *wbr,
-+			 int do_plink, struct au_wh_base base[],
-+			 struct path *h_path)
-+{
-+	int err;
-+	struct inode *h_dir;
-+
-+	WbrWhMustWriteLock(wbr);
-+
-+	err = test_linkable(h_root);
-+	if (unlikely(err)) {
-+		err = 1;
-+		goto out;
-+	}
-+
-+	/*
-+	 * todo: should this create be done in /sbin/mount.aufs helper?
-+	 */
-+	err = -EEXIST;
-+	h_dir = d_inode(h_root);
-+	if (d_is_negative(base[AuBrWh_BASE].dentry)) {
-+		h_path->dentry = base[AuBrWh_BASE].dentry;
-+		err = vfsub_create(h_dir, h_path, WH_MASK, /*want_excl*/true);
-+	} else if (d_is_reg(base[AuBrWh_BASE].dentry))
-+		err = 0;
-+	else
-+		pr_err("unknown %pd2 exists\n", base[AuBrWh_BASE].dentry);
-+	if (unlikely(err))
-+		goto out;
-+
-+	h_path->dentry = base[AuBrWh_PLINK].dentry;
-+	if (do_plink) {
-+		err = au_whdir(h_dir, h_path);
-+		if (unlikely(err))
-+			goto out;
-+		wbr->wbr_plink = dget(base[AuBrWh_PLINK].dentry);
-+	} else
-+		au_wh_clean(h_dir, h_path, /*isdir*/1);
-+	wbr->wbr_whbase = dget(base[AuBrWh_BASE].dentry);
-+
-+	h_path->dentry = base[AuBrWh_ORPH].dentry;
-+	err = au_whdir(h_dir, h_path);
-+	if (unlikely(err))
-+		goto out;
-+	wbr->wbr_orph = dget(base[AuBrWh_ORPH].dentry);
-+
-+out:
-+	return err;
-+}
-+
-+/*
-+ * initialize the whiteout base file/dir for @br.
-+ */
-+int au_wh_init(struct au_branch *br, struct super_block *sb)
-+{
-+	int err, i;
-+	const unsigned char do_plink
-+		= !!au_opt_test(au_mntflags(sb), PLINK);
-+	struct inode *h_dir;
-+	struct path path = br->br_path;
-+	struct dentry *h_root = path.dentry;
-+	struct au_wbr *wbr = br->br_wbr;
-+	static const struct qstr base_name[] = {
-+		[AuBrWh_BASE] = QSTR_INIT(AUFS_BASE_NAME,
-+					  sizeof(AUFS_BASE_NAME) - 1),
-+		[AuBrWh_PLINK] = QSTR_INIT(AUFS_PLINKDIR_NAME,
-+					   sizeof(AUFS_PLINKDIR_NAME) - 1),
-+		[AuBrWh_ORPH] = QSTR_INIT(AUFS_ORPHDIR_NAME,
-+					  sizeof(AUFS_ORPHDIR_NAME) - 1)
-+	};
-+	struct au_wh_base base[] = {
-+		[AuBrWh_BASE] = {
-+			.name	= base_name + AuBrWh_BASE,
-+			.dentry	= NULL
-+		},
-+		[AuBrWh_PLINK] = {
-+			.name	= base_name + AuBrWh_PLINK,
-+			.dentry	= NULL
-+		},
-+		[AuBrWh_ORPH] = {
-+			.name	= base_name + AuBrWh_ORPH,
-+			.dentry	= NULL
-+		}
-+	};
-+
-+	if (wbr)
-+		WbrWhMustWriteLock(wbr);
-+
-+	for (i = 0; i < AuBrWh_Last; i++) {
-+		/* doubly whiteouted */
-+		struct dentry *d;
-+
-+		d = au_wh_lkup(h_root, (void *)base[i].name, br);
-+		err = PTR_ERR(d);
-+		if (IS_ERR(d))
-+			goto out;
-+
-+		base[i].dentry = d;
-+		AuDebugOn(wbr
-+			  && wbr->wbr_wh[i]
-+			  && wbr->wbr_wh[i] != base[i].dentry);
-+	}
-+
-+	if (wbr)
-+		for (i = 0; i < AuBrWh_Last; i++) {
-+			dput(wbr->wbr_wh[i]);
-+			wbr->wbr_wh[i] = NULL;
-+		}
-+
-+	err = 0;
-+	if (!au_br_writable(br->br_perm)) {
-+		h_dir = d_inode(h_root);
-+		au_wh_init_ro(h_dir, base, &path);
-+	} else if (!au_br_wh_linkable(br->br_perm)) {
-+		err = au_wh_init_rw_nolink(h_root, wbr, do_plink, base, &path);
-+		if (err > 0)
-+			goto out;
-+		else if (err)
-+			goto out_err;
-+	} else {
-+		err = au_wh_init_rw(h_root, wbr, do_plink, base, &path);
-+		if (err > 0)
-+			goto out;
-+		else if (err)
-+			goto out_err;
-+	}
-+	goto out; /* success */
-+
-+out_err:
-+	pr_err("an error(%d) on the writable branch %pd(%s)\n",
-+	       err, h_root, au_sbtype(h_root->d_sb));
-+out:
-+	for (i = 0; i < AuBrWh_Last; i++)
-+		dput(base[i].dentry);
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+/*
-+ * whiteouts are all hard-linked usually.
-+ * when its link count reaches a ceiling, we create a new whiteout base
-+ * asynchronously.
-+ */
-+
-+struct reinit_br_wh {
-+	struct super_block *sb;
-+	struct au_branch *br;
-+};
-+
-+static void reinit_br_wh(void *arg)
-+{
-+	int err;
-+	aufs_bindex_t bindex;
-+	struct path h_path;
-+	struct reinit_br_wh *a = arg;
-+	struct au_wbr *wbr;
-+	struct inode *dir, *delegated;
-+	struct dentry *h_root;
-+	struct au_hinode *hdir;
-+
-+	err = 0;
-+	wbr = a->br->br_wbr;
-+	/* big aufs lock */
-+	si_noflush_write_lock(a->sb);
-+	if (!au_br_writable(a->br->br_perm))
-+		goto out;
-+	bindex = au_br_index(a->sb, a->br->br_id);
-+	if (unlikely(bindex < 0))
-+		goto out;
-+
-+	di_read_lock_parent(a->sb->s_root, AuLock_IR);
-+	dir = d_inode(a->sb->s_root);
-+	hdir = au_hi(dir, bindex);
-+	h_root = au_h_dptr(a->sb->s_root, bindex);
-+	AuDebugOn(h_root != au_br_dentry(a->br));
-+
-+	au_hn_imtx_lock_nested(hdir, AuLsc_I_PARENT);
-+	wbr_wh_write_lock(wbr);
-+	err = au_h_verify(wbr->wbr_whbase, au_opt_udba(a->sb), hdir->hi_inode,
-+			  h_root, a->br);
-+	if (!err) {
-+		h_path.dentry = wbr->wbr_whbase;
-+		h_path.mnt = au_br_mnt(a->br);
-+		delegated = NULL;
-+		err = vfsub_unlink(hdir->hi_inode, &h_path, &delegated,
-+				   /*force*/0);
-+		if (unlikely(err == -EWOULDBLOCK)) {
-+			pr_warn("cannot retry for NFSv4 delegation"
-+				" for an internal unlink\n");
-+			iput(delegated);
-+		}
-+	} else {
-+		pr_warn("%pd is moved, ignored\n", wbr->wbr_whbase);
-+		err = 0;
-+	}
-+	dput(wbr->wbr_whbase);
-+	wbr->wbr_whbase = NULL;
-+	if (!err)
-+		err = au_wh_init(a->br, a->sb);
-+	wbr_wh_write_unlock(wbr);
-+	au_hn_imtx_unlock(hdir);
-+	di_read_unlock(a->sb->s_root, AuLock_IR);
-+	if (!err)
-+		au_fhsm_wrote(a->sb, bindex, /*force*/0);
-+
-+out:
-+	if (wbr)
-+		atomic_dec(&wbr->wbr_wh_running);
-+	atomic_dec(&a->br->br_count);
-+	si_write_unlock(a->sb);
-+	au_nwt_done(&au_sbi(a->sb)->si_nowait);
-+	kfree(arg);
-+	if (unlikely(err))
-+		AuIOErr("err %d\n", err);
-+}
-+
-+static void kick_reinit_br_wh(struct super_block *sb, struct au_branch *br)
-+{
-+	int do_dec, wkq_err;
-+	struct reinit_br_wh *arg;
-+
-+	do_dec = 1;
-+	if (atomic_inc_return(&br->br_wbr->wbr_wh_running) != 1)
-+		goto out;
-+
-+	/* ignore ENOMEM */
-+	arg = kmalloc(sizeof(*arg), GFP_NOFS);
-+	if (arg) {
-+		/*
-+		 * dec(wh_running), kfree(arg) and dec(br_count)
-+		 * in reinit function
-+		 */
-+		arg->sb = sb;
-+		arg->br = br;
-+		atomic_inc(&br->br_count);
-+		wkq_err = au_wkq_nowait(reinit_br_wh, arg, sb, /*flags*/0);
-+		if (unlikely(wkq_err)) {
-+			atomic_dec(&br->br_wbr->wbr_wh_running);
-+			atomic_dec(&br->br_count);
-+			kfree(arg);
-+		}
-+		do_dec = 0;
-+	}
-+
-+out:
-+	if (do_dec)
-+		atomic_dec(&br->br_wbr->wbr_wh_running);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/*
-+ * create the whiteout @wh.
-+ */
-+static int link_or_create_wh(struct super_block *sb, aufs_bindex_t bindex,
-+			     struct dentry *wh)
-+{
-+	int err;
-+	struct path h_path = {
-+		.dentry = wh
-+	};
-+	struct au_branch *br;
-+	struct au_wbr *wbr;
-+	struct dentry *h_parent;
-+	struct inode *h_dir, *delegated;
-+
-+	h_parent = wh->d_parent; /* dir inode is locked */
-+	h_dir = d_inode(h_parent);
-+	IMustLock(h_dir);
-+
-+	br = au_sbr(sb, bindex);
-+	h_path.mnt = au_br_mnt(br);
-+	wbr = br->br_wbr;
-+	wbr_wh_read_lock(wbr);
-+	if (wbr->wbr_whbase) {
-+		delegated = NULL;
-+		err = vfsub_link(wbr->wbr_whbase, h_dir, &h_path, &delegated);
-+		if (unlikely(err == -EWOULDBLOCK)) {
-+			pr_warn("cannot retry for NFSv4 delegation"
-+				" for an internal link\n");
-+			iput(delegated);
-+		}
-+		if (!err || err != -EMLINK)
-+			goto out;
-+
-+		/* link count full. re-initialize br_whbase. */
-+		kick_reinit_br_wh(sb, br);
-+	}
-+
-+	/* return this error in this context */
-+	err = vfsub_create(h_dir, &h_path, WH_MASK, /*want_excl*/true);
-+	if (!err)
-+		au_fhsm_wrote(sb, bindex, /*force*/0);
-+
-+out:
-+	wbr_wh_read_unlock(wbr);
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/*
-+ * create or remove the diropq.
-+ */
-+static struct dentry *do_diropq(struct dentry *dentry, aufs_bindex_t bindex,
-+				unsigned int flags)
-+{
-+	struct dentry *opq_dentry, *h_dentry;
-+	struct super_block *sb;
-+	struct au_branch *br;
-+	int err;
-+
-+	sb = dentry->d_sb;
-+	br = au_sbr(sb, bindex);
-+	h_dentry = au_h_dptr(dentry, bindex);
-+	opq_dentry = vfsub_lkup_one(&diropq_name, h_dentry);
-+	if (IS_ERR(opq_dentry))
-+		goto out;
-+
-+	if (au_ftest_diropq(flags, CREATE)) {
-+		err = link_or_create_wh(sb, bindex, opq_dentry);
-+		if (!err) {
-+			au_set_dbdiropq(dentry, bindex);
-+			goto out; /* success */
-+		}
-+	} else {
-+		struct path tmp = {
-+			.dentry = opq_dentry,
-+			.mnt	= au_br_mnt(br)
-+		};
-+		err = do_unlink_wh(au_h_iptr(d_inode(dentry), bindex), &tmp);
-+		if (!err)
-+			au_set_dbdiropq(dentry, -1);
-+	}
-+	dput(opq_dentry);
-+	opq_dentry = ERR_PTR(err);
-+
-+out:
-+	return opq_dentry;
-+}
-+
-+struct do_diropq_args {
-+	struct dentry **errp;
-+	struct dentry *dentry;
-+	aufs_bindex_t bindex;
-+	unsigned int flags;
-+};
-+
-+static void call_do_diropq(void *args)
-+{
-+	struct do_diropq_args *a = args;
-+	*a->errp = do_diropq(a->dentry, a->bindex, a->flags);
-+}
-+
-+struct dentry *au_diropq_sio(struct dentry *dentry, aufs_bindex_t bindex,
-+			     unsigned int flags)
-+{
-+	struct dentry *diropq, *h_dentry;
-+
-+	h_dentry = au_h_dptr(dentry, bindex);
-+	if (!au_test_h_perm_sio(d_inode(h_dentry), MAY_EXEC | MAY_WRITE))
-+		diropq = do_diropq(dentry, bindex, flags);
-+	else {
-+		int wkq_err;
-+		struct do_diropq_args args = {
-+			.errp		= &diropq,
-+			.dentry		= dentry,
-+			.bindex		= bindex,
-+			.flags		= flags
-+		};
-+
-+		wkq_err = au_wkq_wait(call_do_diropq, &args);
-+		if (unlikely(wkq_err))
-+			diropq = ERR_PTR(wkq_err);
-+	}
-+
-+	return diropq;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/*
-+ * lookup whiteout dentry.
-+ * @h_parent: lower parent dentry which must exist and be locked
-+ * @base_name: name of dentry which will be whiteouted
-+ * returns dentry for whiteout.
-+ */
-+struct dentry *au_wh_lkup(struct dentry *h_parent, struct qstr *base_name,
-+			  struct au_branch *br)
-+{
-+	int err;
-+	struct qstr wh_name;
-+	struct dentry *wh_dentry;
-+
-+	err = au_wh_name_alloc(&wh_name, base_name);
-+	wh_dentry = ERR_PTR(err);
-+	if (!err) {
-+		wh_dentry = vfsub_lkup_one(&wh_name, h_parent);
-+		kfree(wh_name.name);
-+	}
-+	return wh_dentry;
-+}
-+
-+/*
-+ * link/create a whiteout for @dentry on @bindex.
-+ */
-+struct dentry *au_wh_create(struct dentry *dentry, aufs_bindex_t bindex,
-+			    struct dentry *h_parent)
-+{
-+	struct dentry *wh_dentry;
-+	struct super_block *sb;
-+	int err;
-+
-+	sb = dentry->d_sb;
-+	wh_dentry = au_wh_lkup(h_parent, &dentry->d_name, au_sbr(sb, bindex));
-+	if (!IS_ERR(wh_dentry) && d_is_negative(wh_dentry)) {
-+		err = link_or_create_wh(sb, bindex, wh_dentry);
-+		if (!err) {
-+			au_set_dbwh(dentry, bindex);
-+			au_fhsm_wrote(sb, bindex, /*force*/0);
-+		} else {
-+			dput(wh_dentry);
-+			wh_dentry = ERR_PTR(err);
-+		}
-+	}
-+
-+	return wh_dentry;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* Delete all whiteouts in this directory on branch bindex. */
-+static int del_wh_children(struct dentry *h_dentry, struct au_nhash *whlist,
-+			   aufs_bindex_t bindex, struct au_branch *br)
-+{
-+	int err;
-+	unsigned long ul, n;
-+	struct qstr wh_name;
-+	char *p;
-+	struct hlist_head *head;
-+	struct au_vdir_wh *pos;
-+	struct au_vdir_destr *str;
-+
-+	err = -ENOMEM;
-+	p = (void *)__get_free_page(GFP_NOFS);
-+	wh_name.name = p;
-+	if (unlikely(!wh_name.name))
-+		goto out;
-+
-+	err = 0;
-+	memcpy(p, AUFS_WH_PFX, AUFS_WH_PFX_LEN);
-+	p += AUFS_WH_PFX_LEN;
-+	n = whlist->nh_num;
-+	head = whlist->nh_head;
-+	for (ul = 0; !err && ul < n; ul++, head++) {
-+		hlist_for_each_entry(pos, head, wh_hash) {
-+			if (pos->wh_bindex != bindex)
-+				continue;
-+
-+			str = &pos->wh_str;
-+			if (str->len + AUFS_WH_PFX_LEN <= PATH_MAX) {
-+				memcpy(p, str->name, str->len);
-+				wh_name.len = AUFS_WH_PFX_LEN + str->len;
-+				err = unlink_wh_name(h_dentry, &wh_name, br);
-+				if (!err)
-+					continue;
-+				break;
-+			}
-+			AuIOErr("whiteout name too long %.*s\n",
-+				str->len, str->name);
-+			err = -EIO;
-+			break;
-+		}
-+	}
-+	free_page((unsigned long)wh_name.name);
-+
-+out:
-+	return err;
-+}
-+
-+struct del_wh_children_args {
-+	int *errp;
-+	struct dentry *h_dentry;
-+	struct au_nhash *whlist;
-+	aufs_bindex_t bindex;
-+	struct au_branch *br;
-+};
-+
-+static void call_del_wh_children(void *args)
-+{
-+	struct del_wh_children_args *a = args;
-+	*a->errp = del_wh_children(a->h_dentry, a->whlist, a->bindex, a->br);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+struct au_whtmp_rmdir *au_whtmp_rmdir_alloc(struct super_block *sb, gfp_t gfp)
-+{
-+	struct au_whtmp_rmdir *whtmp;
-+	int err;
-+	unsigned int rdhash;
-+
-+	SiMustAnyLock(sb);
-+
-+	whtmp = kmalloc(sizeof(*whtmp), gfp);
-+	if (unlikely(!whtmp)) {
-+		whtmp = ERR_PTR(-ENOMEM);
-+		goto out;
-+	}
-+
-+	whtmp->dir = NULL;
-+	whtmp->br = NULL;
-+	whtmp->wh_dentry = NULL;
-+	/* no estimation for dir size */
-+	rdhash = au_sbi(sb)->si_rdhash;
-+	if (!rdhash)
-+		rdhash = AUFS_RDHASH_DEF;
-+	err = au_nhash_alloc(&whtmp->whlist, rdhash, gfp);
-+	if (unlikely(err)) {
-+		kfree(whtmp);
-+		whtmp = ERR_PTR(err);
-+	}
-+
-+out:
-+	return whtmp;
-+}
-+
-+void au_whtmp_rmdir_free(struct au_whtmp_rmdir *whtmp)
-+{
-+	if (whtmp->br)
-+		atomic_dec(&whtmp->br->br_count);
-+	dput(whtmp->wh_dentry);
-+	iput(whtmp->dir);
-+	au_nhash_wh_free(&whtmp->whlist);
-+	kfree(whtmp);
-+}
-+
-+/*
-+ * rmdir the whiteouted temporary named dir @h_dentry.
-+ * @whlist: whiteouted children.
-+ */
-+int au_whtmp_rmdir(struct inode *dir, aufs_bindex_t bindex,
-+		   struct dentry *wh_dentry, struct au_nhash *whlist)
-+{
-+	int err;
-+	unsigned int h_nlink;
-+	struct path h_tmp;
-+	struct inode *wh_inode, *h_dir;
-+	struct au_branch *br;
-+
-+	h_dir = d_inode(wh_dentry->d_parent); /* dir inode is locked */
-+	IMustLock(h_dir);
-+
-+	br = au_sbr(dir->i_sb, bindex);
-+	wh_inode = d_inode(wh_dentry);
-+	mutex_lock_nested(&wh_inode->i_mutex, AuLsc_I_CHILD);
-+
-+	/*
-+	 * someone else might change some whiteouts while we were sleeping.
-+	 * it means this whlist may have an obsoleted entry.
-+	 */
-+	if (!au_test_h_perm_sio(wh_inode, MAY_EXEC | MAY_WRITE))
-+		err = del_wh_children(wh_dentry, whlist, bindex, br);
-+	else {
-+		int wkq_err;
-+		struct del_wh_children_args args = {
-+			.errp		= &err,
-+			.h_dentry	= wh_dentry,
-+			.whlist		= whlist,
-+			.bindex		= bindex,
-+			.br		= br
-+		};
-+
-+		wkq_err = au_wkq_wait(call_del_wh_children, &args);
-+		if (unlikely(wkq_err))
-+			err = wkq_err;
-+	}
-+	mutex_unlock(&wh_inode->i_mutex);
-+
-+	if (!err) {
-+		h_tmp.dentry = wh_dentry;
-+		h_tmp.mnt = au_br_mnt(br);
-+		h_nlink = h_dir->i_nlink;
-+		err = vfsub_rmdir(h_dir, &h_tmp);
-+		/* some fs doesn't change the parent nlink in some cases */
-+		h_nlink -= h_dir->i_nlink;
-+	}
-+
-+	if (!err) {
-+		if (au_ibstart(dir) == bindex) {
-+			/* todo: dir->i_mutex is necessary */
-+			au_cpup_attr_timesizes(dir);
-+			if (h_nlink)
-+				vfsub_drop_nlink(dir);
-+		}
-+		return 0; /* success */
-+	}
-+
-+	pr_warn("failed removing %pd(%d), ignored\n", wh_dentry, err);
-+	return err;
-+}
-+
-+static void call_rmdir_whtmp(void *args)
-+{
-+	int err;
-+	aufs_bindex_t bindex;
-+	struct au_whtmp_rmdir *a = args;
-+	struct super_block *sb;
-+	struct dentry *h_parent;
-+	struct inode *h_dir;
-+	struct au_hinode *hdir;
-+
-+	/* rmdir by nfsd may cause deadlock with this i_mutex */
-+	/* mutex_lock(&a->dir->i_mutex); */
-+	err = -EROFS;
-+	sb = a->dir->i_sb;
-+	si_read_lock(sb, !AuLock_FLUSH);
-+	if (!au_br_writable(a->br->br_perm))
-+		goto out;
-+	bindex = au_br_index(sb, a->br->br_id);
-+	if (unlikely(bindex < 0))
-+		goto out;
-+
-+	err = -EIO;
-+	ii_write_lock_parent(a->dir);
-+	h_parent = dget_parent(a->wh_dentry);
-+	h_dir = d_inode(h_parent);
-+	hdir = au_hi(a->dir, bindex);
-+	err = vfsub_mnt_want_write(au_br_mnt(a->br));
-+	if (unlikely(err))
-+		goto out_mnt;
-+	au_hn_imtx_lock_nested(hdir, AuLsc_I_PARENT);
-+	err = au_h_verify(a->wh_dentry, au_opt_udba(sb), h_dir, h_parent,
-+			  a->br);
-+	if (!err)
-+		err = au_whtmp_rmdir(a->dir, bindex, a->wh_dentry, &a->whlist);
-+	au_hn_imtx_unlock(hdir);
-+	vfsub_mnt_drop_write(au_br_mnt(a->br));
-+
-+out_mnt:
-+	dput(h_parent);
-+	ii_write_unlock(a->dir);
-+out:
-+	/* mutex_unlock(&a->dir->i_mutex); */
-+	au_whtmp_rmdir_free(a);
-+	si_read_unlock(sb);
-+	au_nwt_done(&au_sbi(sb)->si_nowait);
-+	if (unlikely(err))
-+		AuIOErr("err %d\n", err);
-+}
-+
-+void au_whtmp_kick_rmdir(struct inode *dir, aufs_bindex_t bindex,
-+			 struct dentry *wh_dentry, struct au_whtmp_rmdir *args)
-+{
-+	int wkq_err;
-+	struct super_block *sb;
-+
-+	IMustLock(dir);
-+
-+	/* all post-process will be done in do_rmdir_whtmp(). */
-+	sb = dir->i_sb;
-+	args->dir = au_igrab(dir);
-+	args->br = au_sbr(sb, bindex);
-+	atomic_inc(&args->br->br_count);
-+	args->wh_dentry = dget(wh_dentry);
-+	wkq_err = au_wkq_nowait(call_rmdir_whtmp, args, sb, /*flags*/0);
-+	if (unlikely(wkq_err)) {
-+		pr_warn("rmdir error %pd (%d), ignored\n", wh_dentry, wkq_err);
-+		au_whtmp_rmdir_free(args);
-+	}
-+}
-diff -Nur linux-4.1.10.orig/fs/aufs/whout.h linux-4.1.10/fs/aufs/whout.h
---- linux-4.1.10.orig/fs/aufs/whout.h	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/whout.h	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,85 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * whiteout for logical deletion and opaque directory
-+ */
-+
-+#ifndef __AUFS_WHOUT_H__
-+#define __AUFS_WHOUT_H__
-+
-+#ifdef __KERNEL__
-+
-+#include "dir.h"
-+
-+/* whout.c */
-+int au_wh_name_alloc(struct qstr *wh, const struct qstr *name);
-+int au_wh_test(struct dentry *h_parent, struct qstr *wh_name, int try_sio);
-+int au_diropq_test(struct dentry *h_dentry);
-+struct au_branch;
-+struct dentry *au_whtmp_lkup(struct dentry *h_parent, struct au_branch *br,
-+			     struct qstr *prefix);
-+int au_whtmp_ren(struct dentry *h_dentry, struct au_branch *br);
-+int au_wh_unlink_dentry(struct inode *h_dir, struct path *h_path,
-+			struct dentry *dentry);
-+int au_wh_init(struct au_branch *br, struct super_block *sb);
-+
-+/* diropq flags */
-+#define AuDiropq_CREATE	1
-+#define au_ftest_diropq(flags, name)	((flags) & AuDiropq_##name)
-+#define au_fset_diropq(flags, name) \
-+	do { (flags) |= AuDiropq_##name; } while (0)
-+#define au_fclr_diropq(flags, name) \
-+	do { (flags) &= ~AuDiropq_##name; } while (0)
-+
-+struct dentry *au_diropq_sio(struct dentry *dentry, aufs_bindex_t bindex,
-+			     unsigned int flags);
-+struct dentry *au_wh_lkup(struct dentry *h_parent, struct qstr *base_name,
-+			  struct au_branch *br);
-+struct dentry *au_wh_create(struct dentry *dentry, aufs_bindex_t bindex,
-+			    struct dentry *h_parent);
-+
-+/* real rmdir for the whiteout-ed dir */
-+struct au_whtmp_rmdir {
-+	struct inode *dir;
-+	struct au_branch *br;
-+	struct dentry *wh_dentry;
-+	struct au_nhash whlist;
-+};
-+
-+struct au_whtmp_rmdir *au_whtmp_rmdir_alloc(struct super_block *sb, gfp_t gfp);
-+void au_whtmp_rmdir_free(struct au_whtmp_rmdir *whtmp);
-+int au_whtmp_rmdir(struct inode *dir, aufs_bindex_t bindex,
-+		   struct dentry *wh_dentry, struct au_nhash *whlist);
-+void au_whtmp_kick_rmdir(struct inode *dir, aufs_bindex_t bindex,
-+			 struct dentry *wh_dentry, struct au_whtmp_rmdir *args);
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static inline struct dentry *au_diropq_create(struct dentry *dentry,
-+					      aufs_bindex_t bindex)
-+{
-+	return au_diropq_sio(dentry, bindex, AuDiropq_CREATE);
-+}
-+
-+static inline int au_diropq_remove(struct dentry *dentry, aufs_bindex_t bindex)
-+{
-+	return PTR_ERR(au_diropq_sio(dentry, bindex, !AuDiropq_CREATE));
-+}
-+
-+#endif /* __KERNEL__ */
-+#endif /* __AUFS_WHOUT_H__ */
-diff -Nur linux-4.1.10.orig/fs/aufs/wkq.c linux-4.1.10/fs/aufs/wkq.c
---- linux-4.1.10.orig/fs/aufs/wkq.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/wkq.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,213 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * workqueue for asynchronous/super-io operations
-+ * todo: try new dredential scheme
-+ */
-+
-+#include <linux/module.h>
-+#include "aufs.h"
-+
-+/* internal workqueue named AUFS_WKQ_NAME */
-+
-+static struct workqueue_struct *au_wkq;
-+
-+struct au_wkinfo {
-+	struct work_struct wk;
-+	struct kobject *kobj;
-+
-+	unsigned int flags; /* see wkq.h */
-+
-+	au_wkq_func_t func;
-+	void *args;
-+
-+	struct completion *comp;
-+};
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static void wkq_func(struct work_struct *wk)
-+{
-+	struct au_wkinfo *wkinfo = container_of(wk, struct au_wkinfo, wk);
-+
-+	AuDebugOn(!uid_eq(current_fsuid(), GLOBAL_ROOT_UID));
-+	AuDebugOn(rlimit(RLIMIT_FSIZE) != RLIM_INFINITY);
-+
-+	wkinfo->func(wkinfo->args);
-+	if (au_ftest_wkq(wkinfo->flags, WAIT))
-+		complete(wkinfo->comp);
-+	else {
-+		kobject_put(wkinfo->kobj);
-+		module_put(THIS_MODULE); /* todo: ?? */
-+		kfree(wkinfo);
-+	}
-+}
-+
-+/*
-+ * Since struct completion is large, try allocating it dynamically.
-+ */
-+#if 1 /* defined(CONFIG_4KSTACKS) || defined(AuTest4KSTACKS) */
-+#define AuWkqCompDeclare(name)	struct completion *comp = NULL
-+
-+static int au_wkq_comp_alloc(struct au_wkinfo *wkinfo, struct completion **comp)
-+{
-+	*comp = kmalloc(sizeof(**comp), GFP_NOFS);
-+	if (*comp) {
-+		init_completion(*comp);
-+		wkinfo->comp = *comp;
-+		return 0;
-+	}
-+	return -ENOMEM;
-+}
-+
-+static void au_wkq_comp_free(struct completion *comp)
-+{
-+	kfree(comp);
-+}
-+
-+#else
-+
-+/* no braces */
-+#define AuWkqCompDeclare(name) \
-+	DECLARE_COMPLETION_ONSTACK(_ ## name); \
-+	struct completion *comp = &_ ## name
-+
-+static int au_wkq_comp_alloc(struct au_wkinfo *wkinfo, struct completion **comp)
-+{
-+	wkinfo->comp = *comp;
-+	return 0;
-+}
-+
-+static void au_wkq_comp_free(struct completion *comp __maybe_unused)
-+{
-+	/* empty */
-+}
-+#endif /* 4KSTACKS */
-+
-+static void au_wkq_run(struct au_wkinfo *wkinfo)
-+{
-+	if (au_ftest_wkq(wkinfo->flags, NEST)) {
-+		if (au_wkq_test()) {
-+			AuWarn1("wkq from wkq, unless silly-rename on NFS,"
-+				" due to a dead dir by UDBA?\n");
-+			AuDebugOn(au_ftest_wkq(wkinfo->flags, WAIT));
-+		}
-+	} else
-+		au_dbg_verify_kthread();
-+
-+	if (au_ftest_wkq(wkinfo->flags, WAIT)) {
-+		INIT_WORK_ONSTACK(&wkinfo->wk, wkq_func);
-+		queue_work(au_wkq, &wkinfo->wk);
-+	} else {
-+		INIT_WORK(&wkinfo->wk, wkq_func);
-+		schedule_work(&wkinfo->wk);
-+	}
-+}
-+
-+/*
-+ * Be careful. It is easy to make deadlock happen.
-+ * processA: lock, wkq and wait
-+ * processB: wkq and wait, lock in wkq
-+ * --> deadlock
-+ */
-+int au_wkq_do_wait(unsigned int flags, au_wkq_func_t func, void *args)
-+{
-+	int err;
-+	AuWkqCompDeclare(comp);
-+	struct au_wkinfo wkinfo = {
-+		.flags	= flags,
-+		.func	= func,
-+		.args	= args
-+	};
-+
-+	err = au_wkq_comp_alloc(&wkinfo, &comp);
-+	if (!err) {
-+		au_wkq_run(&wkinfo);
-+		/* no timeout, no interrupt */
-+		wait_for_completion(wkinfo.comp);
-+		au_wkq_comp_free(comp);
-+		destroy_work_on_stack(&wkinfo.wk);
-+	}
-+
-+	return err;
-+
-+}
-+
-+/*
-+ * Note: dget/dput() in func for aufs dentries are not supported. It will be a
-+ * problem in a concurrent umounting.
-+ */
-+int au_wkq_nowait(au_wkq_func_t func, void *args, struct super_block *sb,
-+		  unsigned int flags)
-+{
-+	int err;
-+	struct au_wkinfo *wkinfo;
-+
-+	atomic_inc(&au_sbi(sb)->si_nowait.nw_len);
-+
-+	/*
-+	 * wkq_func() must free this wkinfo.
-+	 * it highly depends upon the implementation of workqueue.
-+	 */
-+	err = 0;
-+	wkinfo = kmalloc(sizeof(*wkinfo), GFP_NOFS);
-+	if (wkinfo) {
-+		wkinfo->kobj = &au_sbi(sb)->si_kobj;
-+		wkinfo->flags = flags & ~AuWkq_WAIT;
-+		wkinfo->func = func;
-+		wkinfo->args = args;
-+		wkinfo->comp = NULL;
-+		kobject_get(wkinfo->kobj);
-+		__module_get(THIS_MODULE); /* todo: ?? */
-+
-+		au_wkq_run(wkinfo);
-+	} else {
-+		err = -ENOMEM;
-+		au_nwt_done(&au_sbi(sb)->si_nowait);
-+	}
-+
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+void au_nwt_init(struct au_nowait_tasks *nwt)
-+{
-+	atomic_set(&nwt->nw_len, 0);
-+	/* smp_mb(); */ /* atomic_set */
-+	init_waitqueue_head(&nwt->nw_wq);
-+}
-+
-+void au_wkq_fin(void)
-+{
-+	destroy_workqueue(au_wkq);
-+}
-+
-+int __init au_wkq_init(void)
-+{
-+	int err;
-+
-+	err = 0;
-+	au_wkq = alloc_workqueue(AUFS_WKQ_NAME, 0, WQ_DFL_ACTIVE);
-+	if (IS_ERR(au_wkq))
-+		err = PTR_ERR(au_wkq);
-+	else if (!au_wkq)
-+		err = -ENOMEM;
-+
-+	return err;
-+}
-diff -Nur linux-4.1.10.orig/fs/aufs/wkq.h linux-4.1.10/fs/aufs/wkq.h
---- linux-4.1.10.orig/fs/aufs/wkq.h	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/wkq.h	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,91 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * workqueue for asynchronous/super-io operations
-+ * todo: try new credentials management scheme
-+ */
-+
-+#ifndef __AUFS_WKQ_H__
-+#define __AUFS_WKQ_H__
-+
-+#ifdef __KERNEL__
-+
-+struct super_block;
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/*
-+ * in the next operation, wait for the 'nowait' tasks in system-wide workqueue
-+ */
-+struct au_nowait_tasks {
-+	atomic_t		nw_len;
-+	wait_queue_head_t	nw_wq;
-+};
-+
-+/* ---------------------------------------------------------------------- */
-+
-+typedef void (*au_wkq_func_t)(void *args);
-+
-+/* wkq flags */
-+#define AuWkq_WAIT	1
-+#define AuWkq_NEST	(1 << 1)
-+#define au_ftest_wkq(flags, name)	((flags) & AuWkq_##name)
-+#define au_fset_wkq(flags, name) \
-+	do { (flags) |= AuWkq_##name; } while (0)
-+#define au_fclr_wkq(flags, name) \
-+	do { (flags) &= ~AuWkq_##name; } while (0)
-+
-+#ifndef CONFIG_AUFS_HNOTIFY
-+#undef AuWkq_NEST
-+#define AuWkq_NEST	0
-+#endif
-+
-+/* wkq.c */
-+int au_wkq_do_wait(unsigned int flags, au_wkq_func_t func, void *args);
-+int au_wkq_nowait(au_wkq_func_t func, void *args, struct super_block *sb,
-+		  unsigned int flags);
-+void au_nwt_init(struct au_nowait_tasks *nwt);
-+int __init au_wkq_init(void);
-+void au_wkq_fin(void);
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static inline int au_wkq_test(void)
-+{
-+	return current->flags & PF_WQ_WORKER;
-+}
-+
-+static inline int au_wkq_wait(au_wkq_func_t func, void *args)
-+{
-+	return au_wkq_do_wait(AuWkq_WAIT, func, args);
-+}
-+
-+static inline void au_nwt_done(struct au_nowait_tasks *nwt)
-+{
-+	if (atomic_dec_and_test(&nwt->nw_len))
-+		wake_up_all(&nwt->nw_wq);
-+}
-+
-+static inline int au_nwt_flush(struct au_nowait_tasks *nwt)
-+{
-+	wait_event(nwt->nw_wq, !atomic_read(&nwt->nw_len));
-+	return 0;
-+}
-+
-+#endif /* __KERNEL__ */
-+#endif /* __AUFS_WKQ_H__ */
-diff -Nur linux-4.1.10.orig/fs/aufs/xattr.c linux-4.1.10/fs/aufs/xattr.c
---- linux-4.1.10.orig/fs/aufs/xattr.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/xattr.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,344 @@
-+/*
-+ * Copyright (C) 2014-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * handling xattr functions
-+ */
-+
-+#include <linux/xattr.h>
-+#include "aufs.h"
-+
-+static int au_xattr_ignore(int err, char *name, unsigned int ignore_flags)
-+{
-+	if (!ignore_flags)
-+		goto out;
-+	switch (err) {
-+	case -ENOMEM:
-+	case -EDQUOT:
-+		goto out;
-+	}
-+
-+	if ((ignore_flags & AuBrAttr_ICEX) == AuBrAttr_ICEX) {
-+		err = 0;
-+		goto out;
-+	}
-+
-+#define cmp(brattr, prefix) do {					\
-+		if (!strncmp(name, XATTR_##prefix##_PREFIX,		\
-+			     XATTR_##prefix##_PREFIX_LEN)) {		\
-+			if (ignore_flags & AuBrAttr_ICEX_##brattr)	\
-+				err = 0;				\
-+			goto out;					\
-+		}							\
-+	} while (0)
-+
-+	cmp(SEC, SECURITY);
-+	cmp(SYS, SYSTEM);
-+	cmp(TR, TRUSTED);
-+	cmp(USR, USER);
-+#undef cmp
-+
-+	if (ignore_flags & AuBrAttr_ICEX_OTH)
-+		err = 0;
-+
-+out:
-+	return err;
-+}
-+
-+static const int au_xattr_out_of_list = AuBrAttr_ICEX_OTH << 1;
-+
-+static int au_do_cpup_xattr(struct dentry *h_dst, struct dentry *h_src,
-+			    char *name, char **buf, unsigned int ignore_flags,
-+			    unsigned int verbose)
-+{
-+	int err;
-+	ssize_t ssz;
-+	struct inode *h_idst;
-+
-+	ssz = vfs_getxattr_alloc(h_src, name, buf, 0, GFP_NOFS);
-+	err = ssz;
-+	if (unlikely(err <= 0)) {
-+		if (err == -ENODATA
-+		    || (err == -EOPNOTSUPP
-+			&& ((ignore_flags & au_xattr_out_of_list)
-+			    || (au_test_nfs_noacl(d_inode(h_src))
-+				&& (!strcmp(name, XATTR_NAME_POSIX_ACL_ACCESS)
-+				    || !strcmp(name,
-+					       XATTR_NAME_POSIX_ACL_DEFAULT))))
-+			    ))
-+			err = 0;
-+		if (err && (verbose || au_debug_test()))
-+			pr_err("%s, err %d\n", name, err);
-+		goto out;
-+	}
-+
-+	/* unlock it temporary */
-+	h_idst = d_inode(h_dst);
-+	mutex_unlock(&h_idst->i_mutex);
-+	err = vfsub_setxattr(h_dst, name, *buf, ssz, /*flags*/0);
-+	mutex_lock_nested(&h_idst->i_mutex, AuLsc_I_CHILD2);
-+	if (unlikely(err)) {
-+		if (verbose || au_debug_test())
-+			pr_err("%s, err %d\n", name, err);
-+		err = au_xattr_ignore(err, name, ignore_flags);
-+	}
-+
-+out:
-+	return err;
-+}
-+
-+int au_cpup_xattr(struct dentry *h_dst, struct dentry *h_src, int ignore_flags,
-+		  unsigned int verbose)
-+{
-+	int err, unlocked, acl_access, acl_default;
-+	ssize_t ssz;
-+	struct inode *h_isrc, *h_idst;
-+	char *value, *p, *o, *e;
-+
-+	/* try stopping to update the source inode while we are referencing */
-+	/* there should not be the parent-child relationship between them */
-+	h_isrc = d_inode(h_src);
-+	h_idst = d_inode(h_dst);
-+	mutex_unlock(&h_idst->i_mutex);
-+	mutex_lock_nested(&h_isrc->i_mutex, AuLsc_I_CHILD);
-+	mutex_lock_nested(&h_idst->i_mutex, AuLsc_I_CHILD2);
-+	unlocked = 0;
-+
-+	/* some filesystems don't list POSIX ACL, for example tmpfs */
-+	ssz = vfs_listxattr(h_src, NULL, 0);
-+	err = ssz;
-+	if (unlikely(err < 0)) {
-+		AuTraceErr(err);
-+		if (err == -ENODATA
-+		    || err == -EOPNOTSUPP)
-+			err = 0;	/* ignore */
-+		goto out;
-+	}
-+
-+	err = 0;
-+	p = NULL;
-+	o = NULL;
-+	if (ssz) {
-+		err = -ENOMEM;
-+		p = kmalloc(ssz, GFP_NOFS);
-+		o = p;
-+		if (unlikely(!p))
-+			goto out;
-+		err = vfs_listxattr(h_src, p, ssz);
-+	}
-+	mutex_unlock(&h_isrc->i_mutex);
-+	unlocked = 1;
-+	AuDbg("err %d, ssz %zd\n", err, ssz);
-+	if (unlikely(err < 0))
-+		goto out_free;
-+
-+	err = 0;
-+	e = p + ssz;
-+	value = NULL;
-+	acl_access = 0;
-+	acl_default = 0;
-+	while (!err && p < e) {
-+		acl_access |= !strncmp(p, XATTR_NAME_POSIX_ACL_ACCESS,
-+				       sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1);
-+		acl_default |= !strncmp(p, XATTR_NAME_POSIX_ACL_DEFAULT,
-+					sizeof(XATTR_NAME_POSIX_ACL_DEFAULT)
-+					- 1);
-+		err = au_do_cpup_xattr(h_dst, h_src, p, &value, ignore_flags,
-+				       verbose);
-+		p += strlen(p) + 1;
-+	}
-+	AuTraceErr(err);
-+	ignore_flags |= au_xattr_out_of_list;
-+	if (!err && !acl_access) {
-+		err = au_do_cpup_xattr(h_dst, h_src,
-+				       XATTR_NAME_POSIX_ACL_ACCESS, &value,
-+				       ignore_flags, verbose);
-+		AuTraceErr(err);
-+	}
-+	if (!err && !acl_default) {
-+		err = au_do_cpup_xattr(h_dst, h_src,
-+				       XATTR_NAME_POSIX_ACL_DEFAULT, &value,
-+				       ignore_flags, verbose);
-+		AuTraceErr(err);
-+	}
-+
-+	kfree(value);
-+
-+out_free:
-+	kfree(o);
-+out:
-+	if (!unlocked)
-+		mutex_unlock(&h_isrc->i_mutex);
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+enum {
-+	AU_XATTR_LIST,
-+	AU_XATTR_GET
-+};
-+
-+struct au_lgxattr {
-+	int type;
-+	union {
-+		struct {
-+			char	*list;
-+			size_t	size;
-+		} list;
-+		struct {
-+			const char	*name;
-+			void		*value;
-+			size_t		size;
-+		} get;
-+	} u;
-+};
-+
-+static ssize_t au_lgxattr(struct dentry *dentry, struct au_lgxattr *arg)
-+{
-+	ssize_t err;
-+	struct path h_path;
-+	struct super_block *sb;
-+
-+	sb = dentry->d_sb;
-+	err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM);
-+	if (unlikely(err))
-+		goto out;
-+	err = au_h_path_getattr(dentry, /*force*/1, &h_path);
-+	if (unlikely(err))
-+		goto out_si;
-+	if (unlikely(!h_path.dentry))
-+		/* illegally overlapped or something */
-+		goto out_di; /* pretending success */
-+
-+	/* always topmost entry only */
-+	switch (arg->type) {
-+	case AU_XATTR_LIST:
-+		err = vfs_listxattr(h_path.dentry,
-+				    arg->u.list.list, arg->u.list.size);
-+		break;
-+	case AU_XATTR_GET:
-+		err = vfs_getxattr(h_path.dentry,
-+				   arg->u.get.name, arg->u.get.value,
-+				   arg->u.get.size);
-+		break;
-+	}
-+
-+out_di:
-+	di_read_unlock(dentry, AuLock_IR);
-+out_si:
-+	si_read_unlock(sb);
-+out:
-+	AuTraceErr(err);
-+	return err;
-+}
-+
-+ssize_t aufs_listxattr(struct dentry *dentry, char *list, size_t size)
-+{
-+	struct au_lgxattr arg = {
-+		.type = AU_XATTR_LIST,
-+		.u.list = {
-+			.list	= list,
-+			.size	= size
-+		},
-+	};
-+
-+	return au_lgxattr(dentry, &arg);
-+}
-+
-+ssize_t aufs_getxattr(struct dentry *dentry, const char *name, void *value,
-+		      size_t size)
-+{
-+	struct au_lgxattr arg = {
-+		.type = AU_XATTR_GET,
-+		.u.get = {
-+			.name	= name,
-+			.value	= value,
-+			.size	= size
-+		},
-+	};
-+
-+	return au_lgxattr(dentry, &arg);
-+}
-+
-+int aufs_setxattr(struct dentry *dentry, const char *name, const void *value,
-+		  size_t size, int flags)
-+{
-+	struct au_srxattr arg = {
-+		.type = AU_XATTR_SET,
-+		.u.set = {
-+			.name	= name,
-+			.value	= value,
-+			.size	= size,
-+			.flags	= flags
-+		},
-+	};
-+
-+	return au_srxattr(dentry, &arg);
-+}
-+
-+int aufs_removexattr(struct dentry *dentry, const char *name)
-+{
-+	struct au_srxattr arg = {
-+		.type = AU_XATTR_REMOVE,
-+		.u.remove = {
-+			.name	= name
-+		},
-+	};
-+
-+	return au_srxattr(dentry, &arg);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+#if 0
-+static size_t au_xattr_list(struct dentry *dentry, char *list, size_t list_size,
-+			    const char *name, size_t name_len, int type)
-+{
-+	return aufs_listxattr(dentry, list, list_size);
-+}
-+
-+static int au_xattr_get(struct dentry *dentry, const char *name, void *buffer,
-+			size_t size, int type)
-+{
-+	return aufs_getxattr(dentry, name, buffer, size);
-+}
-+
-+static int au_xattr_set(struct dentry *dentry, const char *name,
-+			const void *value, size_t size, int flags, int type)
-+{
-+	return aufs_setxattr(dentry, name, value, size, flags);
-+}
-+
-+static const struct xattr_handler au_xattr_handler = {
-+	/* no prefix, no flags */
-+	.list	= au_xattr_list,
-+	.get	= au_xattr_get,
-+	.set	= au_xattr_set
-+	/* why no remove? */
-+};
-+
-+static const struct xattr_handler *au_xattr_handlers[] = {
-+	&au_xattr_handler
-+};
-+
-+void au_xattr_init(struct super_block *sb)
-+{
-+	/* sb->s_xattr = au_xattr_handlers; */
-+}
-+#endif
-diff -Nur linux-4.1.10.orig/fs/aufs/xino.c linux-4.1.10/fs/aufs/xino.c
---- linux-4.1.10.orig/fs/aufs/xino.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/fs/aufs/xino.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,1296 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+/*
-+ * external inode number translation table and bitmap
-+ */
-+
-+#include <linux/seq_file.h>
-+#include <linux/statfs.h>
-+#include "aufs.h"
-+
-+/* todo: unnecessary to support mmap_sem since kernel-space? */
-+ssize_t xino_fread(vfs_readf_t func, struct file *file, void *kbuf, size_t size,
-+		   loff_t *pos)
-+{
-+	ssize_t err;
-+	mm_segment_t oldfs;
-+	union {
-+		void *k;
-+		char __user *u;
-+	} buf;
-+
-+	buf.k = kbuf;
-+	oldfs = get_fs();
-+	set_fs(KERNEL_DS);
-+	do {
-+		/* todo: signal_pending? */
-+		err = func(file, buf.u, size, pos);
-+	} while (err == -EAGAIN || err == -EINTR);
-+	set_fs(oldfs);
-+
-+#if 0 /* reserved for future use */
-+	if (err > 0)
-+		fsnotify_access(file->f_path.dentry);
-+#endif
-+
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static ssize_t do_xino_fwrite(vfs_writef_t func, struct file *file, void *kbuf,
-+			      size_t size, loff_t *pos)
-+{
-+	ssize_t err;
-+	mm_segment_t oldfs;
-+	union {
-+		void *k;
-+		const char __user *u;
-+	} buf;
-+
-+	buf.k = kbuf;
-+	oldfs = get_fs();
-+	set_fs(KERNEL_DS);
-+	do {
-+		/* todo: signal_pending? */
-+		err = func(file, buf.u, size, pos);
-+	} while (err == -EAGAIN || err == -EINTR);
-+	set_fs(oldfs);
-+
-+#if 0 /* reserved for future use */
-+	if (err > 0)
-+		fsnotify_modify(file->f_path.dentry);
-+#endif
-+
-+	return err;
-+}
-+
-+struct do_xino_fwrite_args {
-+	ssize_t *errp;
-+	vfs_writef_t func;
-+	struct file *file;
-+	void *buf;
-+	size_t size;
-+	loff_t *pos;
-+};
-+
-+static void call_do_xino_fwrite(void *args)
-+{
-+	struct do_xino_fwrite_args *a = args;
-+	*a->errp = do_xino_fwrite(a->func, a->file, a->buf, a->size, a->pos);
-+}
-+
-+ssize_t xino_fwrite(vfs_writef_t func, struct file *file, void *buf,
-+		    size_t size, loff_t *pos)
-+{
-+	ssize_t err;
-+
-+	/* todo: signal block and no wkq? */
-+	if (rlimit(RLIMIT_FSIZE) == RLIM_INFINITY) {
-+		lockdep_off();
-+		err = do_xino_fwrite(func, file, buf, size, pos);
-+		lockdep_on();
-+	} else {
-+		/*
-+		 * it breaks RLIMIT_FSIZE and normal user's limit,
-+		 * users should care about quota and real 'filesystem full.'
-+		 */
-+		int wkq_err;
-+		struct do_xino_fwrite_args args = {
-+			.errp	= &err,
-+			.func	= func,
-+			.file	= file,
-+			.buf	= buf,
-+			.size	= size,
-+			.pos	= pos
-+		};
-+
-+		wkq_err = au_wkq_wait(call_do_xino_fwrite, &args);
-+		if (unlikely(wkq_err))
-+			err = wkq_err;
-+	}
-+
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/*
-+ * create a new xinofile at the same place/path as @base_file.
-+ */
-+struct file *au_xino_create2(struct file *base_file, struct file *copy_src)
-+{
-+	struct file *file;
-+	struct dentry *base, *parent;
-+	struct inode *dir, *delegated;
-+	struct qstr *name;
-+	struct path path;
-+	int err;
-+
-+	base = base_file->f_path.dentry;
-+	parent = base->d_parent; /* dir inode is locked */
-+	dir = d_inode(parent);
-+	IMustLock(dir);
-+
-+	file = ERR_PTR(-EINVAL);
-+	name = &base->d_name;
-+	path.dentry = vfsub_lookup_one_len(name->name, parent, name->len);
-+	if (IS_ERR(path.dentry)) {
-+		file = (void *)path.dentry;
-+		pr_err("%pd lookup err %ld\n",
-+		       base, PTR_ERR(path.dentry));
-+		goto out;
-+	}
-+
-+	/* no need to mnt_want_write() since we call dentry_open() later */
-+	err = vfs_create(dir, path.dentry, S_IRUGO | S_IWUGO, NULL);
-+	if (unlikely(err)) {
-+		file = ERR_PTR(err);
-+		pr_err("%pd create err %d\n", base, err);
-+		goto out_dput;
-+	}
-+
-+	path.mnt = base_file->f_path.mnt;
-+	file = vfsub_dentry_open(&path,
-+				 O_RDWR | O_CREAT | O_EXCL | O_LARGEFILE
-+				 /* | __FMODE_NONOTIFY */);
-+	if (IS_ERR(file)) {
-+		pr_err("%pd open err %ld\n", base, PTR_ERR(file));
-+		goto out_dput;
-+	}
-+
-+	delegated = NULL;
-+	err = vfsub_unlink(dir, &file->f_path, &delegated, /*force*/0);
-+	if (unlikely(err == -EWOULDBLOCK)) {
-+		pr_warn("cannot retry for NFSv4 delegation"
-+			" for an internal unlink\n");
-+		iput(delegated);
-+	}
-+	if (unlikely(err)) {
-+		pr_err("%pd unlink err %d\n", base, err);
-+		goto out_fput;
-+	}
-+
-+	if (copy_src) {
-+		/* no one can touch copy_src xino */
-+		err = au_copy_file(file, copy_src, vfsub_f_size_read(copy_src));
-+		if (unlikely(err)) {
-+			pr_err("%pd copy err %d\n", base, err);
-+			goto out_fput;
-+		}
-+	}
-+	goto out_dput; /* success */
-+
-+out_fput:
-+	fput(file);
-+	file = ERR_PTR(err);
-+out_dput:
-+	dput(path.dentry);
-+out:
-+	return file;
-+}
-+
-+struct au_xino_lock_dir {
-+	struct au_hinode *hdir;
-+	struct dentry *parent;
-+	struct mutex *mtx;
-+};
-+
-+static void au_xino_lock_dir(struct super_block *sb, struct file *xino,
-+			     struct au_xino_lock_dir *ldir)
-+{
-+	aufs_bindex_t brid, bindex;
-+
-+	ldir->hdir = NULL;
-+	bindex = -1;
-+	brid = au_xino_brid(sb);
-+	if (brid >= 0)
-+		bindex = au_br_index(sb, brid);
-+	if (bindex >= 0) {
-+		ldir->hdir = au_hi(d_inode(sb->s_root), bindex);
-+		au_hn_imtx_lock_nested(ldir->hdir, AuLsc_I_PARENT);
-+	} else {
-+		ldir->parent = dget_parent(xino->f_path.dentry);
-+		ldir->mtx = &d_inode(ldir->parent)->i_mutex;
-+		mutex_lock_nested(ldir->mtx, AuLsc_I_PARENT);
-+	}
-+}
-+
-+static void au_xino_unlock_dir(struct au_xino_lock_dir *ldir)
-+{
-+	if (ldir->hdir)
-+		au_hn_imtx_unlock(ldir->hdir);
-+	else {
-+		mutex_unlock(ldir->mtx);
-+		dput(ldir->parent);
-+	}
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* trucate xino files asynchronously */
-+
-+int au_xino_trunc(struct super_block *sb, aufs_bindex_t bindex)
-+{
-+	int err;
-+	unsigned long jiffy;
-+	blkcnt_t blocks;
-+	aufs_bindex_t bi, bend;
-+	struct kstatfs *st;
-+	struct au_branch *br;
-+	struct file *new_xino, *file;
-+	struct super_block *h_sb;
-+	struct au_xino_lock_dir ldir;
-+
-+	err = -ENOMEM;
-+	st = kzalloc(sizeof(*st), GFP_NOFS);
-+	if (unlikely(!st))
-+		goto out;
-+
-+	err = -EINVAL;
-+	bend = au_sbend(sb);
-+	if (unlikely(bindex < 0 || bend < bindex))
-+		goto out_st;
-+	br = au_sbr(sb, bindex);
-+	file = br->br_xino.xi_file;
-+	if (!file)
-+		goto out_st;
-+
-+	err = vfs_statfs(&file->f_path, st);
-+	if (unlikely(err))
-+		AuErr1("statfs err %d, ignored\n", err);
-+	jiffy = jiffies;
-+	blocks = file_inode(file)->i_blocks;
-+	pr_info("begin truncating xino(b%d), ib%llu, %llu/%llu free blks\n",
-+		bindex, (u64)blocks, st->f_bfree, st->f_blocks);
-+
-+	au_xino_lock_dir(sb, file, &ldir);
-+	/* mnt_want_write() is unnecessary here */
-+	new_xino = au_xino_create2(file, file);
-+	au_xino_unlock_dir(&ldir);
-+	err = PTR_ERR(new_xino);
-+	if (IS_ERR(new_xino)) {
-+		pr_err("err %d, ignored\n", err);
-+		goto out_st;
-+	}
-+	err = 0;
-+	fput(file);
-+	br->br_xino.xi_file = new_xino;
-+
-+	h_sb = au_br_sb(br);
-+	for (bi = 0; bi <= bend; bi++) {
-+		if (unlikely(bi == bindex))
-+			continue;
-+		br = au_sbr(sb, bi);
-+		if (au_br_sb(br) != h_sb)
-+			continue;
-+
-+		fput(br->br_xino.xi_file);
-+		br->br_xino.xi_file = new_xino;
-+		get_file(new_xino);
-+	}
-+
-+	err = vfs_statfs(&new_xino->f_path, st);
-+	if (!err) {
-+		pr_info("end truncating xino(b%d), ib%llu, %llu/%llu free blks\n",
-+			bindex, (u64)file_inode(new_xino)->i_blocks,
-+			st->f_bfree, st->f_blocks);
-+		if (file_inode(new_xino)->i_blocks < blocks)
-+			au_sbi(sb)->si_xino_jiffy = jiffy;
-+	} else
-+		AuErr1("statfs err %d, ignored\n", err);
-+
-+out_st:
-+	kfree(st);
-+out:
-+	return err;
-+}
-+
-+struct xino_do_trunc_args {
-+	struct super_block *sb;
-+	struct au_branch *br;
-+};
-+
-+static void xino_do_trunc(void *_args)
-+{
-+	struct xino_do_trunc_args *args = _args;
-+	struct super_block *sb;
-+	struct au_branch *br;
-+	struct inode *dir;
-+	int err;
-+	aufs_bindex_t bindex;
-+
-+	err = 0;
-+	sb = args->sb;
-+	dir = d_inode(sb->s_root);
-+	br = args->br;
-+
-+	si_noflush_write_lock(sb);
-+	ii_read_lock_parent(dir);
-+	bindex = au_br_index(sb, br->br_id);
-+	err = au_xino_trunc(sb, bindex);
-+	ii_read_unlock(dir);
-+	if (unlikely(err))
-+		pr_warn("err b%d, (%d)\n", bindex, err);
-+	atomic_dec(&br->br_xino_running);
-+	atomic_dec(&br->br_count);
-+	si_write_unlock(sb);
-+	au_nwt_done(&au_sbi(sb)->si_nowait);
-+	kfree(args);
-+}
-+
-+static int xino_trunc_test(struct super_block *sb, struct au_branch *br)
-+{
-+	int err;
-+	struct kstatfs st;
-+	struct au_sbinfo *sbinfo;
-+
-+	/* todo: si_xino_expire and the ratio should be customizable */
-+	sbinfo = au_sbi(sb);
-+	if (time_before(jiffies,
-+			sbinfo->si_xino_jiffy + sbinfo->si_xino_expire))
-+		return 0;
-+
-+	/* truncation border */
-+	err = vfs_statfs(&br->br_xino.xi_file->f_path, &st);
-+	if (unlikely(err)) {
-+		AuErr1("statfs err %d, ignored\n", err);
-+		return 0;
-+	}
-+	if (div64_u64(st.f_bfree * 100, st.f_blocks) >= AUFS_XINO_DEF_TRUNC)
-+		return 0;
-+
-+	return 1;
-+}
-+
-+static void xino_try_trunc(struct super_block *sb, struct au_branch *br)
-+{
-+	struct xino_do_trunc_args *args;
-+	int wkq_err;
-+
-+	if (!xino_trunc_test(sb, br))
-+		return;
-+
-+	if (atomic_inc_return(&br->br_xino_running) > 1)
-+		goto out;
-+
-+	/* lock and kfree() will be called in trunc_xino() */
-+	args = kmalloc(sizeof(*args), GFP_NOFS);
-+	if (unlikely(!args)) {
-+		AuErr1("no memory\n");
-+		goto out_args;
-+	}
-+
-+	atomic_inc(&br->br_count);
-+	args->sb = sb;
-+	args->br = br;
-+	wkq_err = au_wkq_nowait(xino_do_trunc, args, sb, /*flags*/0);
-+	if (!wkq_err)
-+		return; /* success */
-+
-+	pr_err("wkq %d\n", wkq_err);
-+	atomic_dec(&br->br_count);
-+
-+out_args:
-+	kfree(args);
-+out:
-+	atomic_dec(&br->br_xino_running);
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static int au_xino_do_write(vfs_writef_t write, struct file *file,
-+			    ino_t h_ino, ino_t ino)
-+{
-+	loff_t pos;
-+	ssize_t sz;
-+
-+	pos = h_ino;
-+	if (unlikely(au_loff_max / sizeof(ino) - 1 < pos)) {
-+		AuIOErr1("too large hi%lu\n", (unsigned long)h_ino);
-+		return -EFBIG;
-+	}
-+	pos *= sizeof(ino);
-+	sz = xino_fwrite(write, file, &ino, sizeof(ino), &pos);
-+	if (sz == sizeof(ino))
-+		return 0; /* success */
-+
-+	AuIOErr("write failed (%zd)\n", sz);
-+	return -EIO;
-+}
-+
-+/*
-+ * write @ino to the xinofile for the specified branch{@sb, @bindex}
-+ * at the position of @h_ino.
-+ * even if @ino is zero, it is written to the xinofile and means no entry.
-+ * if the size of the xino file on a specific filesystem exceeds the watermark,
-+ * try truncating it.
-+ */
-+int au_xino_write(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
-+		  ino_t ino)
-+{
-+	int err;
-+	unsigned int mnt_flags;
-+	struct au_branch *br;
-+
-+	BUILD_BUG_ON(sizeof(long long) != sizeof(au_loff_max)
-+		     || ((loff_t)-1) > 0);
-+	SiMustAnyLock(sb);
-+
-+	mnt_flags = au_mntflags(sb);
-+	if (!au_opt_test(mnt_flags, XINO))
-+		return 0;
-+
-+	br = au_sbr(sb, bindex);
-+	err = au_xino_do_write(au_sbi(sb)->si_xwrite, br->br_xino.xi_file,
-+			       h_ino, ino);
-+	if (!err) {
-+		if (au_opt_test(mnt_flags, TRUNC_XINO)
-+		    && au_test_fs_trunc_xino(au_br_sb(br)))
-+			xino_try_trunc(sb, br);
-+		return 0; /* success */
-+	}
-+
-+	AuIOErr("write failed (%d)\n", err);
-+	return -EIO;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* aufs inode number bitmap */
-+
-+static const int page_bits = (int)PAGE_SIZE * BITS_PER_BYTE;
-+static ino_t xib_calc_ino(unsigned long pindex, int bit)
-+{
-+	ino_t ino;
-+
-+	AuDebugOn(bit < 0 || page_bits <= bit);
-+	ino = AUFS_FIRST_INO + pindex * page_bits + bit;
-+	return ino;
-+}
-+
-+static void xib_calc_bit(ino_t ino, unsigned long *pindex, int *bit)
-+{
-+	AuDebugOn(ino < AUFS_FIRST_INO);
-+	ino -= AUFS_FIRST_INO;
-+	*pindex = ino / page_bits;
-+	*bit = ino % page_bits;
-+}
-+
-+static int xib_pindex(struct super_block *sb, unsigned long pindex)
-+{
-+	int err;
-+	loff_t pos;
-+	ssize_t sz;
-+	struct au_sbinfo *sbinfo;
-+	struct file *xib;
-+	unsigned long *p;
-+
-+	sbinfo = au_sbi(sb);
-+	MtxMustLock(&sbinfo->si_xib_mtx);
-+	AuDebugOn(pindex > ULONG_MAX / PAGE_SIZE
-+		  || !au_opt_test(sbinfo->si_mntflags, XINO));
-+
-+	if (pindex == sbinfo->si_xib_last_pindex)
-+		return 0;
-+
-+	xib = sbinfo->si_xib;
-+	p = sbinfo->si_xib_buf;
-+	pos = sbinfo->si_xib_last_pindex;
-+	pos *= PAGE_SIZE;
-+	sz = xino_fwrite(sbinfo->si_xwrite, xib, p, PAGE_SIZE, &pos);
-+	if (unlikely(sz != PAGE_SIZE))
-+		goto out;
-+
-+	pos = pindex;
-+	pos *= PAGE_SIZE;
-+	if (vfsub_f_size_read(xib) >= pos + PAGE_SIZE)
-+		sz = xino_fread(sbinfo->si_xread, xib, p, PAGE_SIZE, &pos);
-+	else {
-+		memset(p, 0, PAGE_SIZE);
-+		sz = xino_fwrite(sbinfo->si_xwrite, xib, p, PAGE_SIZE, &pos);
-+	}
-+	if (sz == PAGE_SIZE) {
-+		sbinfo->si_xib_last_pindex = pindex;
-+		return 0; /* success */
-+	}
-+
-+out:
-+	AuIOErr1("write failed (%zd)\n", sz);
-+	err = sz;
-+	if (sz >= 0)
-+		err = -EIO;
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+static void au_xib_clear_bit(struct inode *inode)
-+{
-+	int err, bit;
-+	unsigned long pindex;
-+	struct super_block *sb;
-+	struct au_sbinfo *sbinfo;
-+
-+	AuDebugOn(inode->i_nlink);
-+
-+	sb = inode->i_sb;
-+	xib_calc_bit(inode->i_ino, &pindex, &bit);
-+	AuDebugOn(page_bits <= bit);
-+	sbinfo = au_sbi(sb);
-+	mutex_lock(&sbinfo->si_xib_mtx);
-+	err = xib_pindex(sb, pindex);
-+	if (!err) {
-+		clear_bit(bit, sbinfo->si_xib_buf);
-+		sbinfo->si_xib_next_bit = bit;
-+	}
-+	mutex_unlock(&sbinfo->si_xib_mtx);
-+}
-+
-+/* for s_op->delete_inode() */
-+void au_xino_delete_inode(struct inode *inode, const int unlinked)
-+{
-+	int err;
-+	unsigned int mnt_flags;
-+	aufs_bindex_t bindex, bend, bi;
-+	unsigned char try_trunc;
-+	struct au_iinfo *iinfo;
-+	struct super_block *sb;
-+	struct au_hinode *hi;
-+	struct inode *h_inode;
-+	struct au_branch *br;
-+	vfs_writef_t xwrite;
-+
-+	sb = inode->i_sb;
-+	mnt_flags = au_mntflags(sb);
-+	if (!au_opt_test(mnt_flags, XINO)
-+	    || inode->i_ino == AUFS_ROOT_INO)
-+		return;
-+
-+	if (unlinked) {
-+		au_xigen_inc(inode);
-+		au_xib_clear_bit(inode);
-+	}
-+
-+	iinfo = au_ii(inode);
-+	if (!iinfo)
-+		return;
-+
-+	bindex = iinfo->ii_bstart;
-+	if (bindex < 0)
-+		return;
-+
-+	xwrite = au_sbi(sb)->si_xwrite;
-+	try_trunc = !!au_opt_test(mnt_flags, TRUNC_XINO);
-+	hi = iinfo->ii_hinode + bindex;
-+	bend = iinfo->ii_bend;
-+	for (; bindex <= bend; bindex++, hi++) {
-+		h_inode = hi->hi_inode;
-+		if (!h_inode
-+		    || (!unlinked && h_inode->i_nlink))
-+			continue;
-+
-+		/* inode may not be revalidated */
-+		bi = au_br_index(sb, hi->hi_id);
-+		if (bi < 0)
-+			continue;
-+
-+		br = au_sbr(sb, bi);
-+		err = au_xino_do_write(xwrite, br->br_xino.xi_file,
-+				       h_inode->i_ino, /*ino*/0);
-+		if (!err && try_trunc
-+		    && au_test_fs_trunc_xino(au_br_sb(br)))
-+			xino_try_trunc(sb, br);
-+	}
-+}
-+
-+/* get an unused inode number from bitmap */
-+ino_t au_xino_new_ino(struct super_block *sb)
-+{
-+	ino_t ino;
-+	unsigned long *p, pindex, ul, pend;
-+	struct au_sbinfo *sbinfo;
-+	struct file *file;
-+	int free_bit, err;
-+
-+	if (!au_opt_test(au_mntflags(sb), XINO))
-+		return iunique(sb, AUFS_FIRST_INO);
-+
-+	sbinfo = au_sbi(sb);
-+	mutex_lock(&sbinfo->si_xib_mtx);
-+	p = sbinfo->si_xib_buf;
-+	free_bit = sbinfo->si_xib_next_bit;
-+	if (free_bit < page_bits && !test_bit(free_bit, p))
-+		goto out; /* success */
-+	free_bit = find_first_zero_bit(p, page_bits);
-+	if (free_bit < page_bits)
-+		goto out; /* success */
-+
-+	pindex = sbinfo->si_xib_last_pindex;
-+	for (ul = pindex - 1; ul < ULONG_MAX; ul--) {
-+		err = xib_pindex(sb, ul);
-+		if (unlikely(err))
-+			goto out_err;
-+		free_bit = find_first_zero_bit(p, page_bits);
-+		if (free_bit < page_bits)
-+			goto out; /* success */
-+	}
-+
-+	file = sbinfo->si_xib;
-+	pend = vfsub_f_size_read(file) / PAGE_SIZE;
-+	for (ul = pindex + 1; ul <= pend; ul++) {
-+		err = xib_pindex(sb, ul);
-+		if (unlikely(err))
-+			goto out_err;
-+		free_bit = find_first_zero_bit(p, page_bits);
-+		if (free_bit < page_bits)
-+			goto out; /* success */
-+	}
-+	BUG();
-+
-+out:
-+	set_bit(free_bit, p);
-+	sbinfo->si_xib_next_bit = free_bit + 1;
-+	pindex = sbinfo->si_xib_last_pindex;
-+	mutex_unlock(&sbinfo->si_xib_mtx);
-+	ino = xib_calc_ino(pindex, free_bit);
-+	AuDbg("i%lu\n", (unsigned long)ino);
-+	return ino;
-+out_err:
-+	mutex_unlock(&sbinfo->si_xib_mtx);
-+	AuDbg("i0\n");
-+	return 0;
-+}
-+
-+/*
-+ * read @ino from xinofile for the specified branch{@sb, @bindex}
-+ * at the position of @h_ino.
-+ * if @ino does not exist and @do_new is true, get new one.
-+ */
-+int au_xino_read(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
-+		 ino_t *ino)
-+{
-+	int err;
-+	ssize_t sz;
-+	loff_t pos;
-+	struct file *file;
-+	struct au_sbinfo *sbinfo;
-+
-+	*ino = 0;
-+	if (!au_opt_test(au_mntflags(sb), XINO))
-+		return 0; /* no xino */
-+
-+	err = 0;
-+	sbinfo = au_sbi(sb);
-+	pos = h_ino;
-+	if (unlikely(au_loff_max / sizeof(*ino) - 1 < pos)) {
-+		AuIOErr1("too large hi%lu\n", (unsigned long)h_ino);
-+		return -EFBIG;
-+	}
-+	pos *= sizeof(*ino);
-+
-+	file = au_sbr(sb, bindex)->br_xino.xi_file;
-+	if (vfsub_f_size_read(file) < pos + sizeof(*ino))
-+		return 0; /* no ino */
-+
-+	sz = xino_fread(sbinfo->si_xread, file, ino, sizeof(*ino), &pos);
-+	if (sz == sizeof(*ino))
-+		return 0; /* success */
-+
-+	err = sz;
-+	if (unlikely(sz >= 0)) {
-+		err = -EIO;
-+		AuIOErr("xino read error (%zd)\n", sz);
-+	}
-+
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* create and set a new xino file */
-+
-+struct file *au_xino_create(struct super_block *sb, char *fname, int silent)
-+{
-+	struct file *file;
-+	struct dentry *h_parent, *d;
-+	struct inode *h_dir, *inode;
-+	int err;
-+
-+	/*
-+	 * at mount-time, and the xino file is the default path,
-+	 * hnotify is disabled so we have no notify events to ignore.
-+	 * when a user specified the xino, we cannot get au_hdir to be ignored.
-+	 */
-+	file = vfsub_filp_open(fname, O_RDWR | O_CREAT | O_EXCL | O_LARGEFILE
-+			       /* | __FMODE_NONOTIFY */,
-+			       S_IRUGO | S_IWUGO);
-+	if (IS_ERR(file)) {
-+		if (!silent)
-+			pr_err("open %s(%ld)\n", fname, PTR_ERR(file));
-+		return file;
-+	}
-+
-+	/* keep file count */
-+	err = 0;
-+	inode = file_inode(file);
-+	h_parent = dget_parent(file->f_path.dentry);
-+	h_dir = d_inode(h_parent);
-+	mutex_lock_nested(&h_dir->i_mutex, AuLsc_I_PARENT);
-+	/* mnt_want_write() is unnecessary here */
-+	/* no delegation since it is just created */
-+	if (inode->i_nlink)
-+		err = vfsub_unlink(h_dir, &file->f_path, /*delegated*/NULL,
-+				   /*force*/0);
-+	mutex_unlock(&h_dir->i_mutex);
-+	dput(h_parent);
-+	if (unlikely(err)) {
-+		if (!silent)
-+			pr_err("unlink %s(%d)\n", fname, err);
-+		goto out;
-+	}
-+
-+	err = -EINVAL;
-+	d = file->f_path.dentry;
-+	if (unlikely(sb == d->d_sb)) {
-+		if (!silent)
-+			pr_err("%s must be outside\n", fname);
-+		goto out;
-+	}
-+	if (unlikely(au_test_fs_bad_xino(d->d_sb))) {
-+		if (!silent)
-+			pr_err("xino doesn't support %s(%s)\n",
-+			       fname, au_sbtype(d->d_sb));
-+		goto out;
-+	}
-+	return file; /* success */
-+
-+out:
-+	fput(file);
-+	file = ERR_PTR(err);
-+	return file;
-+}
-+
-+/*
-+ * find another branch who is on the same filesystem of the specified
-+ * branch{@btgt}. search until @bend.
-+ */
-+static int is_sb_shared(struct super_block *sb, aufs_bindex_t btgt,
-+			aufs_bindex_t bend)
-+{
-+	aufs_bindex_t bindex;
-+	struct super_block *tgt_sb = au_sbr_sb(sb, btgt);
-+
-+	for (bindex = 0; bindex < btgt; bindex++)
-+		if (unlikely(tgt_sb == au_sbr_sb(sb, bindex)))
-+			return bindex;
-+	for (bindex++; bindex <= bend; bindex++)
-+		if (unlikely(tgt_sb == au_sbr_sb(sb, bindex)))
-+			return bindex;
-+	return -1;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/*
-+ * initialize the xinofile for the specified branch @br
-+ * at the place/path where @base_file indicates.
-+ * test whether another branch is on the same filesystem or not,
-+ * if @do_test is true.
-+ */
-+int au_xino_br(struct super_block *sb, struct au_branch *br, ino_t h_ino,
-+	       struct file *base_file, int do_test)
-+{
-+	int err;
-+	ino_t ino;
-+	aufs_bindex_t bend, bindex;
-+	struct au_branch *shared_br, *b;
-+	struct file *file;
-+	struct super_block *tgt_sb;
-+
-+	shared_br = NULL;
-+	bend = au_sbend(sb);
-+	if (do_test) {
-+		tgt_sb = au_br_sb(br);
-+		for (bindex = 0; bindex <= bend; bindex++) {
-+			b = au_sbr(sb, bindex);
-+			if (tgt_sb == au_br_sb(b)) {
-+				shared_br = b;
-+				break;
-+			}
-+		}
-+	}
-+
-+	if (!shared_br || !shared_br->br_xino.xi_file) {
-+		struct au_xino_lock_dir ldir;
-+
-+		au_xino_lock_dir(sb, base_file, &ldir);
-+		/* mnt_want_write() is unnecessary here */
-+		file = au_xino_create2(base_file, NULL);
-+		au_xino_unlock_dir(&ldir);
-+		err = PTR_ERR(file);
-+		if (IS_ERR(file))
-+			goto out;
-+		br->br_xino.xi_file = file;
-+	} else {
-+		br->br_xino.xi_file = shared_br->br_xino.xi_file;
-+		get_file(br->br_xino.xi_file);
-+	}
-+
-+	ino = AUFS_ROOT_INO;
-+	err = au_xino_do_write(au_sbi(sb)->si_xwrite, br->br_xino.xi_file,
-+			       h_ino, ino);
-+	if (unlikely(err)) {
-+		fput(br->br_xino.xi_file);
-+		br->br_xino.xi_file = NULL;
-+	}
-+
-+out:
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* trucate a xino bitmap file */
-+
-+/* todo: slow */
-+static int do_xib_restore(struct super_block *sb, struct file *file, void *page)
-+{
-+	int err, bit;
-+	ssize_t sz;
-+	unsigned long pindex;
-+	loff_t pos, pend;
-+	struct au_sbinfo *sbinfo;
-+	vfs_readf_t func;
-+	ino_t *ino;
-+	unsigned long *p;
-+
-+	err = 0;
-+	sbinfo = au_sbi(sb);
-+	MtxMustLock(&sbinfo->si_xib_mtx);
-+	p = sbinfo->si_xib_buf;
-+	func = sbinfo->si_xread;
-+	pend = vfsub_f_size_read(file);
-+	pos = 0;
-+	while (pos < pend) {
-+		sz = xino_fread(func, file, page, PAGE_SIZE, &pos);
-+		err = sz;
-+		if (unlikely(sz <= 0))
-+			goto out;
-+
-+		err = 0;
-+		for (ino = page; sz > 0; ino++, sz -= sizeof(ino)) {
-+			if (unlikely(*ino < AUFS_FIRST_INO))
-+				continue;
-+
-+			xib_calc_bit(*ino, &pindex, &bit);
-+			AuDebugOn(page_bits <= bit);
-+			err = xib_pindex(sb, pindex);
-+			if (!err)
-+				set_bit(bit, p);
-+			else
-+				goto out;
-+		}
-+	}
-+
-+out:
-+	return err;
-+}
-+
-+static int xib_restore(struct super_block *sb)
-+{
-+	int err;
-+	aufs_bindex_t bindex, bend;
-+	void *page;
-+
-+	err = -ENOMEM;
-+	page = (void *)__get_free_page(GFP_NOFS);
-+	if (unlikely(!page))
-+		goto out;
-+
-+	err = 0;
-+	bend = au_sbend(sb);
-+	for (bindex = 0; !err && bindex <= bend; bindex++)
-+		if (!bindex || is_sb_shared(sb, bindex, bindex - 1) < 0)
-+			err = do_xib_restore
-+				(sb, au_sbr(sb, bindex)->br_xino.xi_file, page);
-+		else
-+			AuDbg("b%d\n", bindex);
-+	free_page((unsigned long)page);
-+
-+out:
-+	return err;
-+}
-+
-+int au_xib_trunc(struct super_block *sb)
-+{
-+	int err;
-+	ssize_t sz;
-+	loff_t pos;
-+	struct au_xino_lock_dir ldir;
-+	struct au_sbinfo *sbinfo;
-+	unsigned long *p;
-+	struct file *file;
-+
-+	SiMustWriteLock(sb);
-+
-+	err = 0;
-+	sbinfo = au_sbi(sb);
-+	if (!au_opt_test(sbinfo->si_mntflags, XINO))
-+		goto out;
-+
-+	file = sbinfo->si_xib;
-+	if (vfsub_f_size_read(file) <= PAGE_SIZE)
-+		goto out;
-+
-+	au_xino_lock_dir(sb, file, &ldir);
-+	/* mnt_want_write() is unnecessary here */
-+	file = au_xino_create2(sbinfo->si_xib, NULL);
-+	au_xino_unlock_dir(&ldir);
-+	err = PTR_ERR(file);
-+	if (IS_ERR(file))
-+		goto out;
-+	fput(sbinfo->si_xib);
-+	sbinfo->si_xib = file;
-+
-+	p = sbinfo->si_xib_buf;
-+	memset(p, 0, PAGE_SIZE);
-+	pos = 0;
-+	sz = xino_fwrite(sbinfo->si_xwrite, sbinfo->si_xib, p, PAGE_SIZE, &pos);
-+	if (unlikely(sz != PAGE_SIZE)) {
-+		err = sz;
-+		AuIOErr("err %d\n", err);
-+		if (sz >= 0)
-+			err = -EIO;
-+		goto out;
-+	}
-+
-+	mutex_lock(&sbinfo->si_xib_mtx);
-+	/* mnt_want_write() is unnecessary here */
-+	err = xib_restore(sb);
-+	mutex_unlock(&sbinfo->si_xib_mtx);
-+
-+out:
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/*
-+ * xino mount option handlers
-+ */
-+
-+/* xino bitmap */
-+static void xino_clear_xib(struct super_block *sb)
-+{
-+	struct au_sbinfo *sbinfo;
-+
-+	SiMustWriteLock(sb);
-+
-+	sbinfo = au_sbi(sb);
-+	sbinfo->si_xread = NULL;
-+	sbinfo->si_xwrite = NULL;
-+	if (sbinfo->si_xib)
-+		fput(sbinfo->si_xib);
-+	sbinfo->si_xib = NULL;
-+	free_page((unsigned long)sbinfo->si_xib_buf);
-+	sbinfo->si_xib_buf = NULL;
-+}
-+
-+static int au_xino_set_xib(struct super_block *sb, struct file *base)
-+{
-+	int err;
-+	loff_t pos;
-+	struct au_sbinfo *sbinfo;
-+	struct file *file;
-+
-+	SiMustWriteLock(sb);
-+
-+	sbinfo = au_sbi(sb);
-+	file = au_xino_create2(base, sbinfo->si_xib);
-+	err = PTR_ERR(file);
-+	if (IS_ERR(file))
-+		goto out;
-+	if (sbinfo->si_xib)
-+		fput(sbinfo->si_xib);
-+	sbinfo->si_xib = file;
-+	sbinfo->si_xread = vfs_readf(file);
-+	sbinfo->si_xwrite = vfs_writef(file);
-+
-+	err = -ENOMEM;
-+	if (!sbinfo->si_xib_buf)
-+		sbinfo->si_xib_buf = (void *)get_zeroed_page(GFP_NOFS);
-+	if (unlikely(!sbinfo->si_xib_buf))
-+		goto out_unset;
-+
-+	sbinfo->si_xib_last_pindex = 0;
-+	sbinfo->si_xib_next_bit = 0;
-+	if (vfsub_f_size_read(file) < PAGE_SIZE) {
-+		pos = 0;
-+		err = xino_fwrite(sbinfo->si_xwrite, file, sbinfo->si_xib_buf,
-+				  PAGE_SIZE, &pos);
-+		if (unlikely(err != PAGE_SIZE))
-+			goto out_free;
-+	}
-+	err = 0;
-+	goto out; /* success */
-+
-+out_free:
-+	free_page((unsigned long)sbinfo->si_xib_buf);
-+	sbinfo->si_xib_buf = NULL;
-+	if (err >= 0)
-+		err = -EIO;
-+out_unset:
-+	fput(sbinfo->si_xib);
-+	sbinfo->si_xib = NULL;
-+	sbinfo->si_xread = NULL;
-+	sbinfo->si_xwrite = NULL;
-+out:
-+	return err;
-+}
-+
-+/* xino for each branch */
-+static void xino_clear_br(struct super_block *sb)
-+{
-+	aufs_bindex_t bindex, bend;
-+	struct au_branch *br;
-+
-+	bend = au_sbend(sb);
-+	for (bindex = 0; bindex <= bend; bindex++) {
-+		br = au_sbr(sb, bindex);
-+		if (!br || !br->br_xino.xi_file)
-+			continue;
-+
-+		fput(br->br_xino.xi_file);
-+		br->br_xino.xi_file = NULL;
-+	}
-+}
-+
-+static int au_xino_set_br(struct super_block *sb, struct file *base)
-+{
-+	int err;
-+	ino_t ino;
-+	aufs_bindex_t bindex, bend, bshared;
-+	struct {
-+		struct file *old, *new;
-+	} *fpair, *p;
-+	struct au_branch *br;
-+	struct inode *inode;
-+	vfs_writef_t writef;
-+
-+	SiMustWriteLock(sb);
-+
-+	err = -ENOMEM;
-+	bend = au_sbend(sb);
-+	fpair = kcalloc(bend + 1, sizeof(*fpair), GFP_NOFS);
-+	if (unlikely(!fpair))
-+		goto out;
-+
-+	inode = d_inode(sb->s_root);
-+	ino = AUFS_ROOT_INO;
-+	writef = au_sbi(sb)->si_xwrite;
-+	for (bindex = 0, p = fpair; bindex <= bend; bindex++, p++) {
-+		br = au_sbr(sb, bindex);
-+		bshared = is_sb_shared(sb, bindex, bindex - 1);
-+		if (bshared >= 0) {
-+			/* shared xino */
-+			*p = fpair[bshared];
-+			get_file(p->new);
-+		}
-+
-+		if (!p->new) {
-+			/* new xino */
-+			p->old = br->br_xino.xi_file;
-+			p->new = au_xino_create2(base, br->br_xino.xi_file);
-+			err = PTR_ERR(p->new);
-+			if (IS_ERR(p->new)) {
-+				p->new = NULL;
-+				goto out_pair;
-+			}
-+		}
-+
-+		err = au_xino_do_write(writef, p->new,
-+				       au_h_iptr(inode, bindex)->i_ino, ino);
-+		if (unlikely(err))
-+			goto out_pair;
-+	}
-+
-+	for (bindex = 0, p = fpair; bindex <= bend; bindex++, p++) {
-+		br = au_sbr(sb, bindex);
-+		if (br->br_xino.xi_file)
-+			fput(br->br_xino.xi_file);
-+		get_file(p->new);
-+		br->br_xino.xi_file = p->new;
-+	}
-+
-+out_pair:
-+	for (bindex = 0, p = fpair; bindex <= bend; bindex++, p++)
-+		if (p->new)
-+			fput(p->new);
-+		else
-+			break;
-+	kfree(fpair);
-+out:
-+	return err;
-+}
-+
-+void au_xino_clr(struct super_block *sb)
-+{
-+	struct au_sbinfo *sbinfo;
-+
-+	au_xigen_clr(sb);
-+	xino_clear_xib(sb);
-+	xino_clear_br(sb);
-+	sbinfo = au_sbi(sb);
-+	/* lvalue, do not call au_mntflags() */
-+	au_opt_clr(sbinfo->si_mntflags, XINO);
-+}
-+
-+int au_xino_set(struct super_block *sb, struct au_opt_xino *xino, int remount)
-+{
-+	int err, skip;
-+	struct dentry *parent, *cur_parent;
-+	struct qstr *dname, *cur_name;
-+	struct file *cur_xino;
-+	struct inode *dir;
-+	struct au_sbinfo *sbinfo;
-+
-+	SiMustWriteLock(sb);
-+
-+	err = 0;
-+	sbinfo = au_sbi(sb);
-+	parent = dget_parent(xino->file->f_path.dentry);
-+	if (remount) {
-+		skip = 0;
-+		dname = &xino->file->f_path.dentry->d_name;
-+		cur_xino = sbinfo->si_xib;
-+		if (cur_xino) {
-+			cur_parent = dget_parent(cur_xino->f_path.dentry);
-+			cur_name = &cur_xino->f_path.dentry->d_name;
-+			skip = (cur_parent == parent
-+				&& au_qstreq(dname, cur_name));
-+			dput(cur_parent);
-+		}
-+		if (skip)
-+			goto out;
-+	}
-+
-+	au_opt_set(sbinfo->si_mntflags, XINO);
-+	dir = d_inode(parent);
-+	mutex_lock_nested(&dir->i_mutex, AuLsc_I_PARENT);
-+	/* mnt_want_write() is unnecessary here */
-+	err = au_xino_set_xib(sb, xino->file);
-+	if (!err)
-+		err = au_xigen_set(sb, xino->file);
-+	if (!err)
-+		err = au_xino_set_br(sb, xino->file);
-+	mutex_unlock(&dir->i_mutex);
-+	if (!err)
-+		goto out; /* success */
-+
-+	/* reset all */
-+	AuIOErr("failed creating xino(%d).\n", err);
-+	au_xigen_clr(sb);
-+	xino_clear_xib(sb);
-+
-+out:
-+	dput(parent);
-+	return err;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/*
-+ * create a xinofile at the default place/path.
-+ */
-+struct file *au_xino_def(struct super_block *sb)
-+{
-+	struct file *file;
-+	char *page, *p;
-+	struct au_branch *br;
-+	struct super_block *h_sb;
-+	struct path path;
-+	aufs_bindex_t bend, bindex, bwr;
-+
-+	br = NULL;
-+	bend = au_sbend(sb);
-+	bwr = -1;
-+	for (bindex = 0; bindex <= bend; bindex++) {
-+		br = au_sbr(sb, bindex);
-+		if (au_br_writable(br->br_perm)
-+		    && !au_test_fs_bad_xino(au_br_sb(br))) {
-+			bwr = bindex;
-+			break;
-+		}
-+	}
-+
-+	if (bwr >= 0) {
-+		file = ERR_PTR(-ENOMEM);
-+		page = (void *)__get_free_page(GFP_NOFS);
-+		if (unlikely(!page))
-+			goto out;
-+		path.mnt = au_br_mnt(br);
-+		path.dentry = au_h_dptr(sb->s_root, bwr);
-+		p = d_path(&path, page, PATH_MAX - sizeof(AUFS_XINO_FNAME));
-+		file = (void *)p;
-+		if (!IS_ERR(p)) {
-+			strcat(p, "/" AUFS_XINO_FNAME);
-+			AuDbg("%s\n", p);
-+			file = au_xino_create(sb, p, /*silent*/0);
-+			if (!IS_ERR(file))
-+				au_xino_brid_set(sb, br->br_id);
-+		}
-+		free_page((unsigned long)page);
-+	} else {
-+		file = au_xino_create(sb, AUFS_XINO_DEFPATH, /*silent*/0);
-+		if (IS_ERR(file))
-+			goto out;
-+		h_sb = file->f_path.dentry->d_sb;
-+		if (unlikely(au_test_fs_bad_xino(h_sb))) {
-+			pr_err("xino doesn't support %s(%s)\n",
-+			       AUFS_XINO_DEFPATH, au_sbtype(h_sb));
-+			fput(file);
-+			file = ERR_PTR(-EINVAL);
-+		}
-+		if (!IS_ERR(file))
-+			au_xino_brid_set(sb, -1);
-+	}
-+
-+out:
-+	return file;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+int au_xino_path(struct seq_file *seq, struct file *file)
-+{
-+	int err;
-+
-+	err = au_seq_path(seq, &file->f_path);
-+	if (unlikely(err))
-+		goto out;
-+
-+#define Deleted "\\040(deleted)"
-+	seq->count -= sizeof(Deleted) - 1;
-+	AuDebugOn(memcmp(seq->buf + seq->count, Deleted,
-+			 sizeof(Deleted) - 1));
-+#undef Deleted
-+
-+out:
-+	return err;
-+}
-diff -Nur linux-4.1.10.orig/fs/buffer.c linux-4.1.10/fs/buffer.c
---- linux-4.1.10.orig/fs/buffer.c	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/fs/buffer.c	2015-10-22 21:35:53.000000000 +0200
-@@ -2450,7 +2450,7 @@
- 	 * Update file times before taking page lock. We may end up failing the
- 	 * fault so this update may be superfluous but who really cares...
- 	 */
--	file_update_time(vma->vm_file);
-+	vma_file_update_time(vma);
- 
- 	ret = __block_page_mkwrite(vma, vmf, get_block);
- 	sb_end_pagefault(sb);
-diff -Nur linux-4.1.10.orig/fs/dcache.c linux-4.1.10/fs/dcache.c
---- linux-4.1.10.orig/fs/dcache.c	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/fs/dcache.c	2015-10-22 21:35:53.000000000 +0200
-@@ -1167,7 +1167,7 @@
-  *
-  * The @enter() and @finish() callbacks are called with d_lock held.
-  */
--static void d_walk(struct dentry *parent, void *data,
-+void d_walk(struct dentry *parent, void *data,
- 		   enum d_walk_ret (*enter)(void *, struct dentry *),
- 		   void (*finish)(void *))
- {
-@@ -1272,6 +1272,7 @@
- 	seq = 1;
- 	goto again;
- }
-+EXPORT_SYMBOL(d_walk);
- 
- /*
-  * Search for at least 1 mount point in the dentry's subdirs.
-diff -Nur linux-4.1.10.orig/fs/file_table.c linux-4.1.10/fs/file_table.c
---- linux-4.1.10.orig/fs/file_table.c	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/fs/file_table.c	2015-10-22 21:35:53.000000000 +0200
-@@ -147,6 +147,7 @@
- 	}
- 	return ERR_PTR(-ENFILE);
- }
-+EXPORT_SYMBOL(get_empty_filp);
- 
- /**
-  * alloc_file - allocate and initialize a 'struct file'
-@@ -308,6 +309,7 @@
- 		file_free(file);
- 	}
- }
-+EXPORT_SYMBOL(put_filp);
- 
- void __init files_init(unsigned long mempages)
- { 
-diff -Nur linux-4.1.10.orig/fs/inode.c linux-4.1.10/fs/inode.c
---- linux-4.1.10.orig/fs/inode.c	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/fs/inode.c	2015-10-22 21:35:53.000000000 +0200
-@@ -58,6 +58,7 @@
- static __cacheline_aligned_in_smp DEFINE_SPINLOCK(inode_hash_lock);
- 
- __cacheline_aligned_in_smp DEFINE_SPINLOCK(inode_sb_list_lock);
-+EXPORT_SYMBOL(inode_sb_list_lock);
- 
- /*
-  * Empty aops. Can be used for the cases where the user does not
-diff -Nur linux-4.1.10.orig/fs/Kconfig linux-4.1.10/fs/Kconfig
---- linux-4.1.10.orig/fs/Kconfig	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/fs/Kconfig	2015-10-22 21:35:53.000000000 +0200
-@@ -218,6 +218,7 @@
- source "fs/sysv/Kconfig"
- source "fs/ufs/Kconfig"
- source "fs/exofs/Kconfig"
-+source "fs/aufs/Kconfig"
- 
- endif # MISC_FILESYSTEMS
- 
-diff -Nur linux-4.1.10.orig/fs/Makefile linux-4.1.10/fs/Makefile
---- linux-4.1.10.orig/fs/Makefile	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/fs/Makefile	2015-10-22 21:35:53.000000000 +0200
-@@ -127,3 +127,4 @@
- obj-$(CONFIG_CEPH_FS)		+= ceph/
- obj-$(CONFIG_PSTORE)		+= pstore/
- obj-$(CONFIG_EFIVAR_FS)		+= efivarfs/
-+obj-$(CONFIG_AUFS_FS)           += aufs/
-diff -Nur linux-4.1.10.orig/fs/namespace.c linux-4.1.10/fs/namespace.c
---- linux-4.1.10.orig/fs/namespace.c	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/fs/namespace.c	2015-10-22 21:35:53.000000000 +0200
-@@ -463,6 +463,7 @@
- 	mnt_dec_writers(real_mount(mnt));
- 	preempt_enable();
- }
-+EXPORT_SYMBOL_GPL(__mnt_drop_write);
- 
- /**
-  * mnt_drop_write - give up write access to a mount
-@@ -1792,6 +1793,7 @@
- 	}
- 	return 0;
- }
-+EXPORT_SYMBOL(iterate_mounts);
- 
- static void cleanup_group_ids(struct mount *mnt, struct mount *end)
- {
-diff -Nur linux-4.1.10.orig/fs/notify/group.c linux-4.1.10/fs/notify/group.c
---- linux-4.1.10.orig/fs/notify/group.c	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/fs/notify/group.c	2015-10-22 21:35:53.000000000 +0200
-@@ -22,6 +22,7 @@
- #include <linux/srcu.h>
- #include <linux/rculist.h>
- #include <linux/wait.h>
-+#include <linux/module.h>
- 
- #include <linux/fsnotify_backend.h>
- #include "fsnotify.h"
-@@ -72,6 +73,7 @@
- {
- 	atomic_inc(&group->refcnt);
- }
-+EXPORT_SYMBOL(fsnotify_get_group);
- 
- /*
-  * Drop a reference to a group.  Free it if it's through.
-@@ -81,6 +83,7 @@
- 	if (atomic_dec_and_test(&group->refcnt))
- 		fsnotify_final_destroy_group(group);
- }
-+EXPORT_SYMBOL(fsnotify_put_group);
- 
- /*
-  * Create a new fsnotify_group and hold a reference for the group returned.
-@@ -109,6 +112,7 @@
- 
- 	return group;
- }
-+EXPORT_SYMBOL(fsnotify_alloc_group);
- 
- int fsnotify_fasync(int fd, struct file *file, int on)
- {
-diff -Nur linux-4.1.10.orig/fs/notify/mark.c linux-4.1.10/fs/notify/mark.c
---- linux-4.1.10.orig/fs/notify/mark.c	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/fs/notify/mark.c	2015-10-22 21:35:53.000000000 +0200
-@@ -109,6 +109,7 @@
- 		mark->free_mark(mark);
- 	}
- }
-+EXPORT_SYMBOL(fsnotify_put_mark);
- 
- /* Calculate mask of events for a list of marks */
- u32 fsnotify_recalc_mask(struct hlist_head *head)
-@@ -202,6 +203,7 @@
- 	fsnotify_destroy_mark_locked(mark, group);
- 	mutex_unlock(&group->mark_mutex);
- }
-+EXPORT_SYMBOL(fsnotify_destroy_mark);
- 
- /*
-  * Destroy all marks in the given list. The marks must be already detached from
-@@ -376,6 +378,7 @@
- 
- 	return ret;
- }
-+EXPORT_SYMBOL(fsnotify_add_mark);
- 
- int fsnotify_add_mark(struct fsnotify_mark *mark, struct fsnotify_group *group,
- 		      struct inode *inode, struct vfsmount *mnt, int allow_dups)
-@@ -475,6 +478,7 @@
- 	atomic_set(&mark->refcnt, 1);
- 	mark->free_mark = free_mark;
- }
-+EXPORT_SYMBOL(fsnotify_init_mark);
- 
- static int fsnotify_mark_destroy(void *ignored)
- {
-diff -Nur linux-4.1.10.orig/fs/open.c linux-4.1.10/fs/open.c
---- linux-4.1.10.orig/fs/open.c	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/fs/open.c	2015-10-22 21:35:53.000000000 +0200
-@@ -62,6 +62,7 @@
- 	mutex_unlock(&dentry->d_inode->i_mutex);
- 	return ret;
- }
-+EXPORT_SYMBOL(do_truncate);
- 
- long vfs_truncate(struct path *path, loff_t length)
- {
-@@ -676,6 +677,7 @@
- 	}
- 	return 0;
- }
-+EXPORT_SYMBOL(open_check_o_direct);
- 
- static int do_dentry_open(struct file *f,
- 			  int (*open)(struct inode *, struct file *),
-diff -Nur linux-4.1.10.orig/fs/proc/base.c linux-4.1.10/fs/proc/base.c
---- linux-4.1.10.orig/fs/proc/base.c	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/fs/proc/base.c	2015-10-22 21:35:53.000000000 +0200
-@@ -1744,7 +1744,7 @@
- 	down_read(&mm->mmap_sem);
- 	vma = find_exact_vma(mm, vm_start, vm_end);
- 	if (vma && vma->vm_file) {
--		*path = vma->vm_file->f_path;
-+		*path = vma_pr_or_file(vma)->f_path;
- 		path_get(path);
- 		rc = 0;
- 	}
-diff -Nur linux-4.1.10.orig/fs/proc/nommu.c linux-4.1.10/fs/proc/nommu.c
---- linux-4.1.10.orig/fs/proc/nommu.c	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/fs/proc/nommu.c	2015-10-22 21:35:53.000000000 +0200
-@@ -45,7 +45,10 @@
- 	file = region->vm_file;
- 
- 	if (file) {
--		struct inode *inode = file_inode(region->vm_file);
-+		struct inode *inode;
-+
-+		file = vmr_pr_or_file(region);
-+		inode = file_inode(file);
- 		dev = inode->i_sb->s_dev;
- 		ino = inode->i_ino;
- 	}
-diff -Nur linux-4.1.10.orig/fs/proc/task_mmu.c linux-4.1.10/fs/proc/task_mmu.c
---- linux-4.1.10.orig/fs/proc/task_mmu.c	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/fs/proc/task_mmu.c	2015-10-22 21:35:53.000000000 +0200
-@@ -279,7 +279,10 @@
- 	const char *name = NULL;
- 
- 	if (file) {
--		struct inode *inode = file_inode(vma->vm_file);
-+		struct inode *inode;
-+
-+		file = vma_pr_or_file(vma);
-+		inode = file_inode(file);
- 		dev = inode->i_sb->s_dev;
- 		ino = inode->i_ino;
- 		pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT;
-@@ -1479,7 +1482,7 @@
- 	struct proc_maps_private *proc_priv = &numa_priv->proc_maps;
- 	struct vm_area_struct *vma = v;
- 	struct numa_maps *md = &numa_priv->md;
--	struct file *file = vma->vm_file;
-+	struct file *file = vma_pr_or_file(vma);
- 	struct mm_struct *mm = vma->vm_mm;
- 	struct mm_walk walk = {
- 		.hugetlb_entry = gather_hugetlb_stats,
-diff -Nur linux-4.1.10.orig/fs/proc/task_nommu.c linux-4.1.10/fs/proc/task_nommu.c
---- linux-4.1.10.orig/fs/proc/task_nommu.c	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/fs/proc/task_nommu.c	2015-10-22 21:35:53.000000000 +0200
-@@ -160,7 +160,10 @@
- 	file = vma->vm_file;
- 
- 	if (file) {
--		struct inode *inode = file_inode(vma->vm_file);
-+		struct inode *inode;
-+
-+		file = vma_pr_or_file(vma);
-+		inode = file_inode(file);
- 		dev = inode->i_sb->s_dev;
- 		ino = inode->i_ino;
- 		pgoff = (loff_t)vma->vm_pgoff << PAGE_SHIFT;
-diff -Nur linux-4.1.10.orig/fs/read_write.c linux-4.1.10/fs/read_write.c
---- linux-4.1.10.orig/fs/read_write.c	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/fs/read_write.c	2015-10-22 21:35:53.000000000 +0200
-@@ -494,6 +494,30 @@
- }
- EXPORT_SYMBOL(__vfs_write);
- 
-+vfs_readf_t vfs_readf(struct file *file)
-+{
-+	const struct file_operations *fop = file->f_op;
-+
-+	if (fop->read)
-+		return fop->read;
-+	if (fop->read_iter)
-+		return new_sync_read;
-+	return ERR_PTR(-ENOSYS);
-+}
-+EXPORT_SYMBOL(vfs_readf);
-+
-+vfs_writef_t vfs_writef(struct file *file)
-+{
-+	const struct file_operations *fop = file->f_op;
-+
-+	if (fop->write)
-+		return fop->write;
-+	if (fop->write_iter)
-+		return new_sync_write;
-+	return ERR_PTR(-ENOSYS);
-+}
-+EXPORT_SYMBOL(vfs_writef);
-+
- ssize_t __kernel_write(struct file *file, const char *buf, size_t count, loff_t *pos)
- {
- 	mm_segment_t old_fs;
-diff -Nur linux-4.1.10.orig/fs/splice.c linux-4.1.10/fs/splice.c
---- linux-4.1.10.orig/fs/splice.c	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/fs/splice.c	2015-10-22 21:35:53.000000000 +0200
-@@ -1101,8 +1101,8 @@
- /*
-  * Attempt to initiate a splice from pipe to file.
-  */
--static long do_splice_from(struct pipe_inode_info *pipe, struct file *out,
--			   loff_t *ppos, size_t len, unsigned int flags)
-+long do_splice_from(struct pipe_inode_info *pipe, struct file *out,
-+		    loff_t *ppos, size_t len, unsigned int flags)
- {
- 	ssize_t (*splice_write)(struct pipe_inode_info *, struct file *,
- 				loff_t *, size_t, unsigned int);
-@@ -1114,13 +1114,14 @@
- 
- 	return splice_write(pipe, out, ppos, len, flags);
- }
-+EXPORT_SYMBOL(do_splice_from);
- 
- /*
-  * Attempt to initiate a splice from a file to a pipe.
-  */
--static long do_splice_to(struct file *in, loff_t *ppos,
--			 struct pipe_inode_info *pipe, size_t len,
--			 unsigned int flags)
-+long do_splice_to(struct file *in, loff_t *ppos,
-+		  struct pipe_inode_info *pipe, size_t len,
-+		  unsigned int flags)
- {
- 	ssize_t (*splice_read)(struct file *, loff_t *,
- 			       struct pipe_inode_info *, size_t, unsigned int);
-@@ -1140,6 +1141,7 @@
- 
- 	return splice_read(in, ppos, pipe, len, flags);
- }
-+EXPORT_SYMBOL(do_splice_to);
- 
- /**
-  * splice_direct_to_actor - splices data directly between two non-pipes
-diff -Nur linux-4.1.10.orig/fs/xattr.c linux-4.1.10/fs/xattr.c
---- linux-4.1.10.orig/fs/xattr.c	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/fs/xattr.c	2015-10-22 21:35:53.000000000 +0200
-@@ -207,6 +207,7 @@
- 	*xattr_value = value;
- 	return error;
- }
-+EXPORT_SYMBOL(vfs_getxattr_alloc);
- 
- /* Compare an extended attribute value with the given value */
- int vfs_xattr_cmp(struct dentry *dentry, const char *xattr_name,
-diff -Nur linux-4.1.10.orig/include/linux/file.h linux-4.1.10/include/linux/file.h
---- linux-4.1.10.orig/include/linux/file.h	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/include/linux/file.h	2015-10-22 21:35:53.000000000 +0200
-@@ -19,6 +19,7 @@
- struct path;
- extern struct file *alloc_file(struct path *, fmode_t mode,
- 	const struct file_operations *fop);
-+extern struct file *get_empty_filp(void);
- 
- static inline void fput_light(struct file *file, int fput_needed)
- {
-diff -Nur linux-4.1.10.orig/include/linux/fs.h linux-4.1.10/include/linux/fs.h
---- linux-4.1.10.orig/include/linux/fs.h	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/include/linux/fs.h	2015-10-22 21:35:53.000000000 +0200
-@@ -1649,6 +1649,12 @@
- 			      struct iovec *fast_pointer,
- 			      struct iovec **ret_pointer);
- 
-+typedef ssize_t (*vfs_readf_t)(struct file *, char __user *, size_t, loff_t *);
-+typedef ssize_t (*vfs_writef_t)(struct file *, const char __user *, size_t,
-+				loff_t *);
-+vfs_readf_t vfs_readf(struct file *file);
-+vfs_writef_t vfs_writef(struct file *file);
-+
- extern ssize_t __vfs_read(struct file *, char __user *, size_t, loff_t *);
- extern ssize_t __vfs_write(struct file *, const char __user *, size_t, loff_t *);
- extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
-diff -Nur linux-4.1.10.orig/include/linux/mm.h linux-4.1.10/include/linux/mm.h
---- linux-4.1.10.orig/include/linux/mm.h	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/include/linux/mm.h	2015-10-22 21:35:53.000000000 +0200
-@@ -1200,6 +1200,28 @@
- }
- #endif
- 
-+extern void vma_do_file_update_time(struct vm_area_struct *, const char[], int);
-+extern struct file *vma_do_pr_or_file(struct vm_area_struct *, const char[],
-+				      int);
-+extern void vma_do_get_file(struct vm_area_struct *, const char[], int);
-+extern void vma_do_fput(struct vm_area_struct *, const char[], int);
-+
-+#define vma_file_update_time(vma)	vma_do_file_update_time(vma, __func__, \
-+								__LINE__)
-+#define vma_pr_or_file(vma)		vma_do_pr_or_file(vma, __func__, \
-+							  __LINE__)
-+#define vma_get_file(vma)		vma_do_get_file(vma, __func__, __LINE__)
-+#define vma_fput(vma)			vma_do_fput(vma, __func__, __LINE__)
-+
-+#ifndef CONFIG_MMU
-+extern struct file *vmr_do_pr_or_file(struct vm_region *, const char[], int);
-+extern void vmr_do_fput(struct vm_region *, const char[], int);
-+
-+#define vmr_pr_or_file(region)		vmr_do_pr_or_file(region, __func__, \
-+							  __LINE__)
-+#define vmr_fput(region)		vmr_do_fput(region, __func__, __LINE__)
-+#endif /* !CONFIG_MMU */
-+
- extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write);
- extern int access_remote_vm(struct mm_struct *mm, unsigned long addr,
- 		void *buf, int len, int write);
-diff -Nur linux-4.1.10.orig/include/linux/mm_types.h linux-4.1.10/include/linux/mm_types.h
---- linux-4.1.10.orig/include/linux/mm_types.h	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/include/linux/mm_types.h	2015-10-22 21:35:53.000000000 +0200
-@@ -232,6 +232,7 @@
- 	unsigned long	vm_top;		/* region allocated to here */
- 	unsigned long	vm_pgoff;	/* the offset in vm_file corresponding to vm_start */
- 	struct file	*vm_file;	/* the backing file or NULL */
-+	struct file	*vm_prfile;	/* the virtual backing file or NULL */
- 
- 	int		vm_usage;	/* region usage count (access under nommu_region_sem) */
- 	bool		vm_icache_flushed : 1; /* true if the icache has been flushed for
-@@ -296,6 +297,7 @@
- 	unsigned long vm_pgoff;		/* Offset (within vm_file) in PAGE_SIZE
- 					   units, *not* PAGE_CACHE_SIZE */
- 	struct file * vm_file;		/* File we map to (can be NULL). */
-+	struct file *vm_prfile;		/* shadow of vm_file */
- 	void * vm_private_data;		/* was vm_pte (shared mem) */
- 
- #ifndef CONFIG_MMU
-diff -Nur linux-4.1.10.orig/include/linux/splice.h linux-4.1.10/include/linux/splice.h
---- linux-4.1.10.orig/include/linux/splice.h	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/include/linux/splice.h	2015-10-22 21:35:53.000000000 +0200
-@@ -83,4 +83,10 @@
- extern void spd_release_page(struct splice_pipe_desc *, unsigned int);
- 
- extern const struct pipe_buf_operations page_cache_pipe_buf_ops;
-+
-+extern long do_splice_from(struct pipe_inode_info *pipe, struct file *out,
-+			   loff_t *ppos, size_t len, unsigned int flags);
-+extern long do_splice_to(struct file *in, loff_t *ppos,
-+			 struct pipe_inode_info *pipe, size_t len,
-+			 unsigned int flags);
- #endif
-diff -Nur linux-4.1.10.orig/include/uapi/linux/aufs_type.h linux-4.1.10/include/uapi/linux/aufs_type.h
---- linux-4.1.10.orig/include/uapi/linux/aufs_type.h	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/include/uapi/linux/aufs_type.h	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,419 @@
-+/*
-+ * Copyright (C) 2005-2015 Junjiro R. Okajima
-+ *
-+ * This program, aufs is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-+ */
-+
-+#ifndef __AUFS_TYPE_H__
-+#define __AUFS_TYPE_H__
-+
-+#define AUFS_NAME	"aufs"
-+
-+#ifdef __KERNEL__
-+/*
-+ * define it before including all other headers.
-+ * sched.h may use pr_* macros before defining "current", so define the
-+ * no-current version first, and re-define later.
-+ */
-+#define pr_fmt(fmt)	AUFS_NAME " %s:%d: " fmt, __func__, __LINE__
-+#include <linux/sched.h>
-+#undef pr_fmt
-+#define pr_fmt(fmt) \
-+		AUFS_NAME " %s:%d:%.*s[%d]: " fmt, __func__, __LINE__, \
-+		(int)sizeof(current->comm), current->comm, current->pid
-+#else
-+#include <stdint.h>
-+#include <sys/types.h>
-+#endif /* __KERNEL__ */
-+
-+#include <linux/limits.h>
-+
-+#define AUFS_VERSION	"4.1-20151012"
-+
-+/* todo? move this to linux-2.6.19/include/magic.h */
-+#define AUFS_SUPER_MAGIC	('a' << 24 | 'u' << 16 | 'f' << 8 | 's')
-+
-+/* ---------------------------------------------------------------------- */
-+
-+#ifdef CONFIG_AUFS_BRANCH_MAX_127
-+typedef int8_t aufs_bindex_t;
-+#define AUFS_BRANCH_MAX 127
-+#else
-+typedef int16_t aufs_bindex_t;
-+#ifdef CONFIG_AUFS_BRANCH_MAX_511
-+#define AUFS_BRANCH_MAX 511
-+#elif defined(CONFIG_AUFS_BRANCH_MAX_1023)
-+#define AUFS_BRANCH_MAX 1023
-+#elif defined(CONFIG_AUFS_BRANCH_MAX_32767)
-+#define AUFS_BRANCH_MAX 32767
-+#endif
-+#endif
-+
-+#ifdef __KERNEL__
-+#ifndef AUFS_BRANCH_MAX
-+#error unknown CONFIG_AUFS_BRANCH_MAX value
-+#endif
-+#endif /* __KERNEL__ */
-+
-+/* ---------------------------------------------------------------------- */
-+
-+#define AUFS_FSTYPE		AUFS_NAME
-+
-+#define AUFS_ROOT_INO		2
-+#define AUFS_FIRST_INO		11
-+
-+#define AUFS_WH_PFX		".wh."
-+#define AUFS_WH_PFX_LEN		((int)sizeof(AUFS_WH_PFX) - 1)
-+#define AUFS_WH_TMP_LEN		4
-+/* a limit for rmdir/rename a dir and copyup */
-+#define AUFS_MAX_NAMELEN	(NAME_MAX \
-+				- AUFS_WH_PFX_LEN * 2	/* doubly whiteouted */\
-+				- 1			/* dot */\
-+				- AUFS_WH_TMP_LEN)	/* hex */
-+#define AUFS_XINO_FNAME		"." AUFS_NAME ".xino"
-+#define AUFS_XINO_DEFPATH	"/tmp/" AUFS_XINO_FNAME
-+#define AUFS_XINO_DEF_SEC	30 /* seconds */
-+#define AUFS_XINO_DEF_TRUNC	45 /* percentage */
-+#define AUFS_DIRWH_DEF		3
-+#define AUFS_RDCACHE_DEF	10 /* seconds */
-+#define AUFS_RDCACHE_MAX	3600 /* seconds */
-+#define AUFS_RDBLK_DEF		512 /* bytes */
-+#define AUFS_RDHASH_DEF		32
-+#define AUFS_WKQ_NAME		AUFS_NAME "d"
-+#define AUFS_MFS_DEF_SEC	30 /* seconds */
-+#define AUFS_MFS_MAX_SEC	3600 /* seconds */
-+#define AUFS_FHSM_CACHE_DEF_SEC	30 /* seconds */
-+#define AUFS_PLINK_WARN		50 /* number of plinks in a single bucket */
-+
-+/* pseudo-link maintenace under /proc */
-+#define AUFS_PLINK_MAINT_NAME	"plink_maint"
-+#define AUFS_PLINK_MAINT_DIR	"fs/" AUFS_NAME
-+#define AUFS_PLINK_MAINT_PATH	AUFS_PLINK_MAINT_DIR "/" AUFS_PLINK_MAINT_NAME
-+
-+#define AUFS_DIROPQ_NAME	AUFS_WH_PFX ".opq" /* whiteouted doubly */
-+#define AUFS_WH_DIROPQ		AUFS_WH_PFX AUFS_DIROPQ_NAME
-+
-+#define AUFS_BASE_NAME		AUFS_WH_PFX AUFS_NAME
-+#define AUFS_PLINKDIR_NAME	AUFS_WH_PFX "plnk"
-+#define AUFS_ORPHDIR_NAME	AUFS_WH_PFX "orph"
-+
-+/* doubly whiteouted */
-+#define AUFS_WH_BASE		AUFS_WH_PFX AUFS_BASE_NAME
-+#define AUFS_WH_PLINKDIR	AUFS_WH_PFX AUFS_PLINKDIR_NAME
-+#define AUFS_WH_ORPHDIR		AUFS_WH_PFX AUFS_ORPHDIR_NAME
-+
-+/* branch permissions and attributes */
-+#define AUFS_BRPERM_RW		"rw"
-+#define AUFS_BRPERM_RO		"ro"
-+#define AUFS_BRPERM_RR		"rr"
-+#define AUFS_BRATTR_COO_REG	"coo_reg"
-+#define AUFS_BRATTR_COO_ALL	"coo_all"
-+#define AUFS_BRATTR_FHSM	"fhsm"
-+#define AUFS_BRATTR_UNPIN	"unpin"
-+#define AUFS_BRATTR_ICEX	"icex"
-+#define AUFS_BRATTR_ICEX_SEC	"icexsec"
-+#define AUFS_BRATTR_ICEX_SYS	"icexsys"
-+#define AUFS_BRATTR_ICEX_TR	"icextr"
-+#define AUFS_BRATTR_ICEX_USR	"icexusr"
-+#define AUFS_BRATTR_ICEX_OTH	"icexoth"
-+#define AUFS_BRRATTR_WH		"wh"
-+#define AUFS_BRWATTR_NLWH	"nolwh"
-+#define AUFS_BRWATTR_MOO	"moo"
-+
-+#define AuBrPerm_RW		1		/* writable, hardlinkable wh */
-+#define AuBrPerm_RO		(1 << 1)	/* readonly */
-+#define AuBrPerm_RR		(1 << 2)	/* natively readonly */
-+#define AuBrPerm_Mask		(AuBrPerm_RW | AuBrPerm_RO | AuBrPerm_RR)
-+
-+#define AuBrAttr_COO_REG	(1 << 3)	/* copy-up on open */
-+#define AuBrAttr_COO_ALL	(1 << 4)
-+#define AuBrAttr_COO_Mask	(AuBrAttr_COO_REG | AuBrAttr_COO_ALL)
-+
-+#define AuBrAttr_FHSM		(1 << 5)	/* file-based hsm */
-+#define AuBrAttr_UNPIN		(1 << 6)	/* rename-able top dir of
-+						   branch. meaningless since
-+						   linux-3.18-rc1 */
-+
-+/* ignore error in copying XATTR */
-+#define AuBrAttr_ICEX_SEC	(1 << 7)
-+#define AuBrAttr_ICEX_SYS	(1 << 8)
-+#define AuBrAttr_ICEX_TR	(1 << 9)
-+#define AuBrAttr_ICEX_USR	(1 << 10)
-+#define AuBrAttr_ICEX_OTH	(1 << 11)
-+#define AuBrAttr_ICEX		(AuBrAttr_ICEX_SEC	\
-+				 | AuBrAttr_ICEX_SYS	\
-+				 | AuBrAttr_ICEX_TR	\
-+				 | AuBrAttr_ICEX_USR	\
-+				 | AuBrAttr_ICEX_OTH)
-+
-+#define AuBrRAttr_WH		(1 << 12)	/* whiteout-able */
-+#define AuBrRAttr_Mask		AuBrRAttr_WH
-+
-+#define AuBrWAttr_NoLinkWH	(1 << 13)	/* un-hardlinkable whiteouts */
-+#define AuBrWAttr_MOO		(1 << 14)	/* move-up on open */
-+#define AuBrWAttr_Mask		(AuBrWAttr_NoLinkWH | AuBrWAttr_MOO)
-+
-+#define AuBrAttr_CMOO_Mask	(AuBrAttr_COO_Mask | AuBrWAttr_MOO)
-+
-+/* #warning test userspace */
-+#ifdef __KERNEL__
-+#ifndef CONFIG_AUFS_FHSM
-+#undef AuBrAttr_FHSM
-+#define AuBrAttr_FHSM		0
-+#endif
-+#ifndef CONFIG_AUFS_XATTR
-+#undef	AuBrAttr_ICEX
-+#define AuBrAttr_ICEX		0
-+#undef	AuBrAttr_ICEX_SEC
-+#define AuBrAttr_ICEX_SEC	0
-+#undef	AuBrAttr_ICEX_SYS
-+#define AuBrAttr_ICEX_SYS	0
-+#undef	AuBrAttr_ICEX_TR
-+#define AuBrAttr_ICEX_TR	0
-+#undef	AuBrAttr_ICEX_USR
-+#define AuBrAttr_ICEX_USR	0
-+#undef	AuBrAttr_ICEX_OTH
-+#define AuBrAttr_ICEX_OTH	0
-+#endif
-+#endif
-+
-+/* the longest combination */
-+/* AUFS_BRATTR_ICEX and AUFS_BRATTR_ICEX_TR don't affect here */
-+#define AuBrPermStrSz	sizeof(AUFS_BRPERM_RW			\
-+			       "+" AUFS_BRATTR_COO_REG		\
-+			       "+" AUFS_BRATTR_FHSM		\
-+			       "+" AUFS_BRATTR_UNPIN		\
-+			       "+" AUFS_BRATTR_ICEX_SEC		\
-+			       "+" AUFS_BRATTR_ICEX_SYS		\
-+			       "+" AUFS_BRATTR_ICEX_USR		\
-+			       "+" AUFS_BRATTR_ICEX_OTH		\
-+			       "+" AUFS_BRWATTR_NLWH)
-+
-+typedef struct {
-+	char a[AuBrPermStrSz];
-+} au_br_perm_str_t;
-+
-+static inline int au_br_writable(int brperm)
-+{
-+	return brperm & AuBrPerm_RW;
-+}
-+
-+static inline int au_br_whable(int brperm)
-+{
-+	return brperm & (AuBrPerm_RW | AuBrRAttr_WH);
-+}
-+
-+static inline int au_br_wh_linkable(int brperm)
-+{
-+	return !(brperm & AuBrWAttr_NoLinkWH);
-+}
-+
-+static inline int au_br_cmoo(int brperm)
-+{
-+	return brperm & AuBrAttr_CMOO_Mask;
-+}
-+
-+static inline int au_br_fhsm(int brperm)
-+{
-+	return brperm & AuBrAttr_FHSM;
-+}
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* ioctl */
-+enum {
-+	/* readdir in userspace */
-+	AuCtl_RDU,
-+	AuCtl_RDU_INO,
-+
-+	AuCtl_WBR_FD,	/* pathconf wrapper */
-+	AuCtl_IBUSY,	/* busy inode */
-+	AuCtl_MVDOWN,	/* move-down */
-+	AuCtl_BR,	/* info about branches */
-+	AuCtl_FHSM_FD	/* connection for fhsm */
-+};
-+
-+/* borrowed from linux/include/linux/kernel.h */
-+#ifndef ALIGN
-+#define ALIGN(x, a)		__ALIGN_MASK(x, (typeof(x))(a)-1)
-+#define __ALIGN_MASK(x, mask)	(((x)+(mask))&~(mask))
-+#endif
-+
-+/* borrowed from linux/include/linux/compiler-gcc3.h */
-+#ifndef __aligned
-+#define __aligned(x)			__attribute__((aligned(x)))
-+#endif
-+
-+#ifdef __KERNEL__
-+#ifndef __packed
-+#define __packed			__attribute__((packed))
-+#endif
-+#endif
-+
-+struct au_rdu_cookie {
-+	uint64_t	h_pos;
-+	int16_t		bindex;
-+	uint8_t		flags;
-+	uint8_t		pad;
-+	uint32_t	generation;
-+} __aligned(8);
-+
-+struct au_rdu_ent {
-+	uint64_t	ino;
-+	int16_t		bindex;
-+	uint8_t		type;
-+	uint8_t		nlen;
-+	uint8_t		wh;
-+	char		name[0];
-+} __aligned(8);
-+
-+static inline int au_rdu_len(int nlen)
-+{
-+	/* include the terminating NULL */
-+	return ALIGN(sizeof(struct au_rdu_ent) + nlen + 1,
-+		     sizeof(uint64_t));
-+}
-+
-+union au_rdu_ent_ul {
-+	struct au_rdu_ent __user	*e;
-+	uint64_t			ul;
-+};
-+
-+enum {
-+	AufsCtlRduV_SZ,
-+	AufsCtlRduV_End
-+};
-+
-+struct aufs_rdu {
-+	/* input */
-+	union {
-+		uint64_t	sz;	/* AuCtl_RDU */
-+		uint64_t	nent;	/* AuCtl_RDU_INO */
-+	};
-+	union au_rdu_ent_ul	ent;
-+	uint16_t		verify[AufsCtlRduV_End];
-+
-+	/* input/output */
-+	uint32_t		blk;
-+
-+	/* output */
-+	union au_rdu_ent_ul	tail;
-+	/* number of entries which were added in a single call */
-+	uint64_t		rent;
-+	uint8_t			full;
-+	uint8_t			shwh;
-+
-+	struct au_rdu_cookie	cookie;
-+} __aligned(8);
-+
-+/* ---------------------------------------------------------------------- */
-+
-+struct aufs_wbr_fd {
-+	uint32_t	oflags;
-+	int16_t		brid;
-+} __aligned(8);
-+
-+/* ---------------------------------------------------------------------- */
-+
-+struct aufs_ibusy {
-+	uint64_t	ino, h_ino;
-+	int16_t		bindex;
-+} __aligned(8);
-+
-+/* ---------------------------------------------------------------------- */
-+
-+/* error code for move-down */
-+/* the actual message strings are implemented in aufs-util.git */
-+enum {
-+	EAU_MVDOWN_OPAQUE = 1,
-+	EAU_MVDOWN_WHITEOUT,
-+	EAU_MVDOWN_UPPER,
-+	EAU_MVDOWN_BOTTOM,
-+	EAU_MVDOWN_NOUPPER,
-+	EAU_MVDOWN_NOLOWERBR,
-+	EAU_Last
-+};
-+
-+/* flags for move-down */
-+#define AUFS_MVDOWN_DMSG	1
-+#define AUFS_MVDOWN_OWLOWER	(1 << 1)	/* overwrite lower */
-+#define AUFS_MVDOWN_KUPPER	(1 << 2)	/* keep upper */
-+#define AUFS_MVDOWN_ROLOWER	(1 << 3)	/* do even if lower is RO */
-+#define AUFS_MVDOWN_ROLOWER_R	(1 << 4)	/* did on lower RO */
-+#define AUFS_MVDOWN_ROUPPER	(1 << 5)	/* do even if upper is RO */
-+#define AUFS_MVDOWN_ROUPPER_R	(1 << 6)	/* did on upper RO */
-+#define AUFS_MVDOWN_BRID_UPPER	(1 << 7)	/* upper brid */
-+#define AUFS_MVDOWN_BRID_LOWER	(1 << 8)	/* lower brid */
-+#define AUFS_MVDOWN_FHSM_LOWER	(1 << 9)	/* find fhsm attr for lower */
-+#define AUFS_MVDOWN_STFS	(1 << 10)	/* req. stfs */
-+#define AUFS_MVDOWN_STFS_FAILED	(1 << 11)	/* output: stfs is unusable */
-+#define AUFS_MVDOWN_BOTTOM	(1 << 12)	/* output: no more lowers */
-+
-+/* index for move-down */
-+enum {
-+	AUFS_MVDOWN_UPPER,
-+	AUFS_MVDOWN_LOWER,
-+	AUFS_MVDOWN_NARRAY
-+};
-+
-+/*
-+ * additional info of move-down
-+ * number of free blocks and inodes.
-+ * subset of struct kstatfs, but smaller and always 64bit.
-+ */
-+struct aufs_stfs {
-+	uint64_t	f_blocks;
-+	uint64_t	f_bavail;
-+	uint64_t	f_files;
-+	uint64_t	f_ffree;
-+};
-+
-+struct aufs_stbr {
-+	int16_t			brid;	/* optional input */
-+	int16_t			bindex;	/* output */
-+	struct aufs_stfs	stfs;	/* output when AUFS_MVDOWN_STFS set */
-+} __aligned(8);
-+
-+struct aufs_mvdown {
-+	uint32_t		flags;			/* input/output */
-+	struct aufs_stbr	stbr[AUFS_MVDOWN_NARRAY]; /* input/output */
-+	int8_t			au_errno;		/* output */
-+} __aligned(8);
-+
-+/* ---------------------------------------------------------------------- */
-+
-+union aufs_brinfo {
-+	/* PATH_MAX may differ between kernel-space and user-space */
-+	char	_spacer[4096];
-+	struct {
-+		int16_t	id;
-+		int	perm;
-+		char	path[0];
-+	};
-+} __aligned(8);
-+
-+/* ---------------------------------------------------------------------- */
-+
-+#define AuCtlType		'A'
-+#define AUFS_CTL_RDU		_IOWR(AuCtlType, AuCtl_RDU, struct aufs_rdu)
-+#define AUFS_CTL_RDU_INO	_IOWR(AuCtlType, AuCtl_RDU_INO, struct aufs_rdu)
-+#define AUFS_CTL_WBR_FD		_IOW(AuCtlType, AuCtl_WBR_FD, \
-+				     struct aufs_wbr_fd)
-+#define AUFS_CTL_IBUSY		_IOWR(AuCtlType, AuCtl_IBUSY, struct aufs_ibusy)
-+#define AUFS_CTL_MVDOWN		_IOWR(AuCtlType, AuCtl_MVDOWN, \
-+				      struct aufs_mvdown)
-+#define AUFS_CTL_BRINFO		_IOW(AuCtlType, AuCtl_BR, union aufs_brinfo)
-+#define AUFS_CTL_FHSM_FD	_IOW(AuCtlType, AuCtl_FHSM_FD, int)
-+
-+#endif /* __AUFS_TYPE_H__ */
-diff -Nur linux-4.1.10.orig/include/uapi/linux/Kbuild linux-4.1.10/include/uapi/linux/Kbuild
---- linux-4.1.10.orig/include/uapi/linux/Kbuild	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/include/uapi/linux/Kbuild	2015-10-22 21:35:53.000000000 +0200
-@@ -59,6 +59,7 @@
- header-y += atm_tcp.h
- header-y += atm_zatm.h
- header-y += audit.h
-+header-y += aufs_type.h
- header-y += auto_fs4.h
- header-y += auto_fs.h
- header-y += auxvec.h
-diff -Nur linux-4.1.10.orig/kernel/fork.c linux-4.1.10/kernel/fork.c
---- linux-4.1.10.orig/kernel/fork.c	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/kernel/fork.c	2015-10-22 21:35:53.000000000 +0200
-@@ -456,7 +456,7 @@
- 			struct inode *inode = file_inode(file);
- 			struct address_space *mapping = file->f_mapping;
- 
--			get_file(file);
-+			vma_get_file(tmp);
- 			if (tmp->vm_flags & VM_DENYWRITE)
- 				atomic_dec(&inode->i_writecount);
- 			i_mmap_lock_write(mapping);
-diff -Nur linux-4.1.10.orig/MAINTAINERS linux-4.1.10/MAINTAINERS
---- linux-4.1.10.orig/MAINTAINERS	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/MAINTAINERS	2015-10-22 21:35:53.000000000 +0200
-@@ -1880,6 +1880,19 @@
- F:	include/uapi/linux/audit.h
- F:	kernel/audit*
- 
-+AUFS (advanced multi layered unification filesystem) FILESYSTEM
-+M:	"J. R. Okajima" <hooanon05g@gmail.com>
-+L:	linux-unionfs@vger.kernel.org
-+L:	aufs-users@lists.sourceforge.net (members only)
-+W:	http://aufs.sourceforge.net
-+T:	git://github.com/sfjro/aufs4-linux.git
-+S:	Supported
-+F:	Documentation/filesystems/aufs/
-+F:	Documentation/ABI/testing/debugfs-aufs
-+F:	Documentation/ABI/testing/sysfs-aufs
-+F:	fs/aufs/
-+F:	include/uapi/linux/aufs_type.h
-+
- AUXILIARY DISPLAY DRIVERS
- M:	Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>
- W:	http://miguelojeda.es/auxdisplay.htm
-diff -Nur linux-4.1.10.orig/mm/filemap.c linux-4.1.10/mm/filemap.c
---- linux-4.1.10.orig/mm/filemap.c	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/mm/filemap.c	2015-10-22 21:35:53.000000000 +0200
-@@ -2062,7 +2062,7 @@
- 	int ret = VM_FAULT_LOCKED;
- 
- 	sb_start_pagefault(inode->i_sb);
--	file_update_time(vma->vm_file);
-+	vma_file_update_time(vma);
- 	lock_page(page);
- 	if (page->mapping != inode->i_mapping) {
- 		unlock_page(page);
-diff -Nur linux-4.1.10.orig/mm/Makefile linux-4.1.10/mm/Makefile
---- linux-4.1.10.orig/mm/Makefile	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/mm/Makefile	2015-10-22 21:35:53.000000000 +0200
-@@ -21,7 +21,7 @@
- 			   mm_init.o mmu_context.o percpu.o slab_common.o \
- 			   compaction.o vmacache.o \
- 			   interval_tree.o list_lru.o workingset.o \
--			   debug.o $(mmu-y)
-+			   prfile.o debug.o $(mmu-y)
- 
- obj-y += init-mm.o
- 
-diff -Nur linux-4.1.10.orig/mm/memory.c linux-4.1.10/mm/memory.c
---- linux-4.1.10.orig/mm/memory.c	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/mm/memory.c	2015-10-22 21:35:53.000000000 +0200
-@@ -2034,7 +2034,7 @@
- 		}
- 
- 		if (!page_mkwrite)
--			file_update_time(vma->vm_file);
-+			vma_file_update_time(vma);
- 	}
- 
- 	return VM_FAULT_WRITE;
-diff -Nur linux-4.1.10.orig/mm/mmap.c linux-4.1.10/mm/mmap.c
---- linux-4.1.10.orig/mm/mmap.c	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/mm/mmap.c	2015-10-22 21:35:53.000000000 +0200
-@@ -274,7 +274,7 @@
- 	if (vma->vm_ops && vma->vm_ops->close)
- 		vma->vm_ops->close(vma);
- 	if (vma->vm_file)
--		fput(vma->vm_file);
-+		vma_fput(vma);
- 	mpol_put(vma_policy(vma));
- 	kmem_cache_free(vm_area_cachep, vma);
- 	return next;
-@@ -886,7 +886,7 @@
- 	if (remove_next) {
- 		if (file) {
- 			uprobe_munmap(next, next->vm_start, next->vm_end);
--			fput(file);
-+			vma_fput(vma);
- 		}
- 		if (next->anon_vma)
- 			anon_vma_merge(vma, next);
-@@ -1671,8 +1671,8 @@
- 	return addr;
- 
- unmap_and_free_vma:
-+	vma_fput(vma);
- 	vma->vm_file = NULL;
--	fput(file);
- 
- 	/* Undo any partial mapping done by a device driver. */
- 	unmap_region(mm, vma, prev, vma->vm_start, vma->vm_end);
-@@ -2473,7 +2473,7 @@
- 		goto out_free_mpol;
- 
- 	if (new->vm_file)
--		get_file(new->vm_file);
-+		vma_get_file(new);
- 
- 	if (new->vm_ops && new->vm_ops->open)
- 		new->vm_ops->open(new);
-@@ -2492,7 +2492,7 @@
- 	if (new->vm_ops && new->vm_ops->close)
- 		new->vm_ops->close(new);
- 	if (new->vm_file)
--		fput(new->vm_file);
-+		vma_fput(new);
- 	unlink_anon_vmas(new);
-  out_free_mpol:
- 	mpol_put(vma_policy(new));
-@@ -2635,7 +2635,6 @@
- 	struct vm_area_struct *vma;
- 	unsigned long populate = 0;
- 	unsigned long ret = -EINVAL;
--	struct file *file;
- 
- 	pr_warn_once("%s (%d) uses deprecated remap_file_pages() syscall. "
- 			"See Documentation/vm/remap_file_pages.txt.\n",
-@@ -2679,10 +2678,10 @@
- 		munlock_vma_pages_range(vma, start, start + size);
- 	}
- 
--	file = get_file(vma->vm_file);
-+	vma_get_file(vma);
- 	ret = do_mmap_pgoff(vma->vm_file, start, size,
- 			prot, flags, pgoff, &populate);
--	fput(file);
-+	vma_fput(vma);
- out:
- 	up_write(&mm->mmap_sem);
- 	if (populate)
-@@ -2949,7 +2948,7 @@
- 			if (anon_vma_clone(new_vma, vma))
- 				goto out_free_mempol;
- 			if (new_vma->vm_file)
--				get_file(new_vma->vm_file);
-+				vma_get_file(new_vma);
- 			if (new_vma->vm_ops && new_vma->vm_ops->open)
- 				new_vma->vm_ops->open(new_vma);
- 			vma_link(mm, new_vma, prev, rb_link, rb_parent);
-diff -Nur linux-4.1.10.orig/mm/nommu.c linux-4.1.10/mm/nommu.c
---- linux-4.1.10.orig/mm/nommu.c	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/mm/nommu.c	2015-10-22 21:35:53.000000000 +0200
-@@ -693,7 +693,7 @@
- 		up_write(&nommu_region_sem);
- 
- 		if (region->vm_file)
--			fput(region->vm_file);
-+			vmr_fput(region);
- 
- 		/* IO memory and memory shared directly out of the pagecache
- 		 * from ramfs/tmpfs mustn't be released here */
-@@ -858,7 +858,7 @@
- 	if (vma->vm_ops && vma->vm_ops->close)
- 		vma->vm_ops->close(vma);
- 	if (vma->vm_file)
--		fput(vma->vm_file);
-+		vma_fput(vma);
- 	put_nommu_region(vma->vm_region);
- 	kmem_cache_free(vm_area_cachep, vma);
- }
-@@ -1398,7 +1398,7 @@
- 					goto error_just_free;
- 				}
- 			}
--			fput(region->vm_file);
-+			vmr_fput(region);
- 			kmem_cache_free(vm_region_jar, region);
- 			region = pregion;
- 			result = start;
-@@ -1474,10 +1474,10 @@
- 	up_write(&nommu_region_sem);
- error:
- 	if (region->vm_file)
--		fput(region->vm_file);
-+		vmr_fput(region);
- 	kmem_cache_free(vm_region_jar, region);
- 	if (vma->vm_file)
--		fput(vma->vm_file);
-+		vma_fput(vma);
- 	kmem_cache_free(vm_area_cachep, vma);
- 	kleave(" = %d", ret);
- 	return ret;
-diff -Nur linux-4.1.10.orig/mm/prfile.c linux-4.1.10/mm/prfile.c
---- linux-4.1.10.orig/mm/prfile.c	1970-01-01 01:00:00.000000000 +0100
-+++ linux-4.1.10/mm/prfile.c	2015-10-22 21:35:53.000000000 +0200
-@@ -0,0 +1,86 @@
-+/*
-+ * Mainly for aufs which mmap(2) diffrent file and wants to print different path
-+ * in /proc/PID/maps.
-+ * Call these functions via macros defined in linux/mm.h.
-+ *
-+ * See Documentation/filesystems/aufs/design/06mmap.txt
-+ *
-+ * Copyright (c) 2014 Junjro R. Okajima
-+ * Copyright (c) 2014 Ian Campbell
-+ */
-+
-+#include <linux/mm.h>
-+#include <linux/file.h>
-+#include <linux/fs.h>
-+
-+/* #define PRFILE_TRACE */
-+static inline void prfile_trace(struct file *f, struct file *pr,
-+			      const char func[], int line, const char func2[])
-+{
-+#ifdef PRFILE_TRACE
-+	if (pr)
-+		pr_info("%s:%d: %s, %s\n", func, line, func2,
-+			f ? (char *)f->f_path.dentry->d_name.name : "(null)");
-+#endif
-+}
-+
-+void vma_do_file_update_time(struct vm_area_struct *vma, const char func[],
-+			     int line)
-+{
-+	struct file *f = vma->vm_file, *pr = vma->vm_prfile;
-+
-+	prfile_trace(f, pr, func, line, __func__);
-+	file_update_time(f);
-+	if (f && pr)
-+		file_update_time(pr);
-+}
-+
-+struct file *vma_do_pr_or_file(struct vm_area_struct *vma, const char func[],
-+			       int line)
-+{
-+	struct file *f = vma->vm_file, *pr = vma->vm_prfile;
-+
-+	prfile_trace(f, pr, func, line, __func__);
-+	return (f && pr) ? pr : f;
-+}
-+
-+void vma_do_get_file(struct vm_area_struct *vma, const char func[], int line)
-+{
-+	struct file *f = vma->vm_file, *pr = vma->vm_prfile;
-+
-+	prfile_trace(f, pr, func, line, __func__);
-+	get_file(f);
-+	if (f && pr)
-+		get_file(pr);
-+}
-+
-+void vma_do_fput(struct vm_area_struct *vma, const char func[], int line)
-+{
-+	struct file *f = vma->vm_file, *pr = vma->vm_prfile;
-+
-+	prfile_trace(f, pr, func, line, __func__);
-+	fput(f);
-+	if (f && pr)
-+		fput(pr);
-+}
-+
-+#ifndef CONFIG_MMU
-+struct file *vmr_do_pr_or_file(struct vm_region *region, const char func[],
-+			       int line)
-+{
-+	struct file *f = region->vm_file, *pr = region->vm_prfile;
-+
-+	prfile_trace(f, pr, func, line, __func__);
-+	return (f && pr) ? pr : f;
-+}
-+
-+void vmr_do_fput(struct vm_region *region, const char func[], int line)
-+{
-+	struct file *f = region->vm_file, *pr = region->vm_prfile;
-+
-+	prfile_trace(f, pr, func, line, __func__);
-+	fput(f);
-+	if (f && pr)
-+		fput(pr);
-+}
-+#endif /* !CONFIG_MMU */
-diff -Nur linux-4.1.10.orig/security/commoncap.c linux-4.1.10/security/commoncap.c
---- linux-4.1.10.orig/security/commoncap.c	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/security/commoncap.c	2015-10-22 21:35:53.000000000 +0200
-@@ -975,9 +975,11 @@
- 	}
- 	return ret;
- }
-+EXPORT_SYMBOL(cap_mmap_addr);
- 
- int cap_mmap_file(struct file *file, unsigned long reqprot,
- 		  unsigned long prot, unsigned long flags)
- {
- 	return 0;
- }
-+EXPORT_SYMBOL(cap_mmap_file);
-diff -Nur linux-4.1.10.orig/security/device_cgroup.c linux-4.1.10/security/device_cgroup.c
---- linux-4.1.10.orig/security/device_cgroup.c	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/security/device_cgroup.c	2015-10-22 21:35:53.000000000 +0200
-@@ -7,6 +7,7 @@
- #include <linux/device_cgroup.h>
- #include <linux/cgroup.h>
- #include <linux/ctype.h>
-+#include <linux/export.h>
- #include <linux/list.h>
- #include <linux/uaccess.h>
- #include <linux/seq_file.h>
-@@ -849,6 +850,7 @@
- 	return __devcgroup_check_permission(type, imajor(inode), iminor(inode),
- 			access);
- }
-+EXPORT_SYMBOL(__devcgroup_inode_permission);
- 
- int devcgroup_inode_mknod(int mode, dev_t dev)
- {
-diff -Nur linux-4.1.10.orig/security/security.c linux-4.1.10/security/security.c
---- linux-4.1.10.orig/security/security.c	2015-10-03 13:49:38.000000000 +0200
-+++ linux-4.1.10/security/security.c	2015-10-22 21:35:53.000000000 +0200
-@@ -430,6 +430,7 @@
- 		return 0;
- 	return security_ops->path_rmdir(dir, dentry);
- }
-+EXPORT_SYMBOL(security_path_rmdir);
- 
- int security_path_unlink(struct path *dir, struct dentry *dentry)
- {
-@@ -446,6 +447,7 @@
- 		return 0;
- 	return security_ops->path_symlink(dir, dentry, old_name);
- }
-+EXPORT_SYMBOL(security_path_symlink);
- 
- int security_path_link(struct dentry *old_dentry, struct path *new_dir,
- 		       struct dentry *new_dentry)
-@@ -454,6 +456,7 @@
- 		return 0;
- 	return security_ops->path_link(old_dentry, new_dir, new_dentry);
- }
-+EXPORT_SYMBOL(security_path_link);
- 
- int security_path_rename(struct path *old_dir, struct dentry *old_dentry,
- 			 struct path *new_dir, struct dentry *new_dentry,
-@@ -481,6 +484,7 @@
- 		return 0;
- 	return security_ops->path_truncate(path);
- }
-+EXPORT_SYMBOL(security_path_truncate);
- 
- int security_path_chmod(struct path *path, umode_t mode)
- {
-@@ -488,6 +492,7 @@
- 		return 0;
- 	return security_ops->path_chmod(path, mode);
- }
-+EXPORT_SYMBOL(security_path_chmod);
- 
- int security_path_chown(struct path *path, kuid_t uid, kgid_t gid)
- {
-@@ -495,6 +500,7 @@
- 		return 0;
- 	return security_ops->path_chown(path, uid, gid);
- }
-+EXPORT_SYMBOL(security_path_chown);
- 
- int security_path_chroot(struct path *path)
- {
-@@ -580,6 +586,7 @@
- 		return 0;
- 	return security_ops->inode_readlink(dentry);
- }
-+EXPORT_SYMBOL(security_inode_readlink);
- 
- int security_inode_follow_link(struct dentry *dentry, struct nameidata *nd)
- {
-@@ -594,6 +601,7 @@
- 		return 0;
- 	return security_ops->inode_permission(inode, mask);
- }
-+EXPORT_SYMBOL(security_inode_permission);
- 
- int security_inode_setattr(struct dentry *dentry, struct iattr *attr)
- {
-@@ -716,6 +724,7 @@
- 
- 	return fsnotify_perm(file, mask);
- }
-+EXPORT_SYMBOL(security_file_permission);
- 
- int security_file_alloc(struct file *file)
- {
-@@ -775,6 +784,7 @@
- 		return ret;
- 	return ima_file_mmap(file, prot);
- }
-+EXPORT_SYMBOL(security_mmap_file);
- 
- int security_mmap_addr(unsigned long addr)
- {