kernel: add aufs2 support

The patches were extracted from the aufs-standalone git tree,
identically named patches are indeed identical.

2 files changed, 94 insertions, 0 deletions

diff --git a/target/linux/config/Config.in.aufs b/target/linux/config/Config.in.aufs
new file mode 100644
index 000000000..fb63ac931
--- /dev/null
+++ b/target/linux/config/Config.in.aufs
@@ -0,0 +1,93 @@
+config ADK_KPACKAGE_KMOD_AUFS_FS
+	prompt "Aufs (Advanced multi layered unification filesystem) support"
+	tristate
+	select ADK_KERNEL_EXPERIMENTAL
+	select FWRT_KPACKAGE_KMOD_EXPORTFS if ADK_KERNEL_AUFS_EXPORT
+	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_KPACKAGE_KMOD_AUFS_FS
+
+choice 
+	boolean "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"
+	select ADK_KERNEL_INOTIFY
+	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"
+	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_KPACKAGE_KMOD_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
diff --git a/target/linux/config/Config.in.fs b/target/linux/config/Config.in.fs
index 3e85ee64b..977d99aa2 100644
--- a/target/linux/config/Config.in.fs
+++ b/target/linux/config/Config.in.fs
@@ -229,5 +229,6 @@ config ADK_KERNEL_INOTIFY_USER
 
 source target/linux/config/Config.in.fsnet
 source target/linux/config/Config.in.nls
+source target/linux/config/Config.in.aufs
 
 endmenu