diff options
Diffstat (limited to 'target/linux/patches/3.18.10/yaffs2.patch')
| -rw-r--r-- | target/linux/patches/3.18.10/yaffs2.patch | 16551 |
1 files changed, 16551 insertions, 0 deletions
diff --git a/target/linux/patches/3.18.10/yaffs2.patch b/target/linux/patches/3.18.10/yaffs2.patch new file mode 100644 index 000000000..bb244c7ca --- /dev/null +++ b/target/linux/patches/3.18.10/yaffs2.patch @@ -0,0 +1,16551 @@ +diff -Nur linux-3.15-rc5.orig/fs/Kconfig linux-3.15-rc5/fs/Kconfig +--- linux-3.15-rc5.orig/fs/Kconfig 2014-05-09 22:10:52.000000000 +0200 ++++ linux-3.15-rc5/fs/Kconfig 2014-05-17 01:53:17.000000000 +0200 +@@ -190,6 +190,7 @@ + source "fs/befs/Kconfig" + source "fs/bfs/Kconfig" + source "fs/efs/Kconfig" ++source "fs/yaffs2/Kconfig" + source "fs/jffs2/Kconfig" + # UBIFS File system configuration + source "fs/ubifs/Kconfig" +diff -Nur linux-3.15-rc5.orig/fs/Makefile linux-3.15-rc5/fs/Makefile +--- linux-3.15-rc5.orig/fs/Makefile 2014-05-09 22:10:52.000000000 +0200 ++++ linux-3.15-rc5/fs/Makefile 2014-05-17 01:53:25.000000000 +0200 +@@ -126,3 +126,4 @@ + obj-$(CONFIG_CEPH_FS) += ceph/ + obj-$(CONFIG_PSTORE) += pstore/ + obj-$(CONFIG_EFIVAR_FS) += efivarfs/ ++obj-$(CONFIG_YAFFS_FS) += yaffs2/ +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/Kconfig linux-3.15-rc5/fs/yaffs2/Kconfig +--- linux-3.15-rc5.orig/fs/yaffs2/Kconfig 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/Kconfig 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,171 @@ ++# ++# yaffs file system configurations ++# ++ ++config YAFFS_FS ++ tristate "yaffs2 file system support" ++ default n ++ depends on MTD_BLOCK ++ select YAFFS_YAFFS1 ++ select YAFFS_YAFFS2 ++ help ++ yaffs2, or Yet Another Flash File System, is a file system ++ optimised for NAND Flash chips. ++ ++ To compile the yaffs2 file system support as a module, choose M ++ here: the module will be called yaffs2. ++ ++ If unsure, say N. ++ ++ Further information on yaffs2 is available at ++ <http://www.aleph1.co.uk/yaffs/>. ++ ++config YAFFS_YAFFS1 ++ bool "512 byte / page devices" ++ depends on YAFFS_FS ++ default y ++ help ++ Enable yaffs1 support -- yaffs for 512 byte / page devices ++ ++ Not needed for 2K-page devices. ++ ++ If unsure, say Y. ++ ++config YAFFS_9BYTE_TAGS ++ bool "Use older-style on-NAND data format with pageStatus byte" ++ depends on YAFFS_YAFFS1 ++ default n ++ help ++ ++ Older-style on-NAND data format has a "pageStatus" byte to record ++ chunk/page state. This byte is zero when the page is discarded. ++ Choose this option if you have existing on-NAND data using this ++ format that you need to continue to support. New data written ++ also uses the older-style format. Note: Use of this option ++ generally requires that MTD's oob layout be adjusted to use the ++ older-style format. See notes on tags formats and MTD versions ++ in yaffs_mtdif1.c. ++ ++ If unsure, say N. ++ ++config YAFFS_DOES_ECC ++ bool "Lets yaffs do its own ECC" ++ depends on YAFFS_FS && YAFFS_YAFFS1 && !YAFFS_9BYTE_TAGS ++ default n ++ help ++ This enables yaffs to use its own ECC functions instead of using ++ the ones from the generic MTD-NAND driver. ++ ++ If unsure, say N. ++ ++config YAFFS_ECC_WRONG_ORDER ++ bool "Use the same ecc byte order as Steven Hill's nand_ecc.c" ++ depends on YAFFS_FS && YAFFS_DOES_ECC && !YAFFS_9BYTE_TAGS ++ default n ++ help ++ This makes yaffs_ecc.c use the same ecc byte order as Steven ++ Hill's nand_ecc.c. If not set, then you get the same ecc byte ++ order as SmartMedia. ++ ++ If unsure, say N. ++ ++config YAFFS_YAFFS2 ++ bool "2048 byte (or larger) / page devices" ++ depends on YAFFS_FS ++ default y ++ help ++ Enable yaffs2 support -- yaffs for >= 2K bytes per page devices ++ ++ If unsure, say Y. ++ ++config YAFFS_AUTO_YAFFS2 ++ bool "Autoselect yaffs2 format" ++ depends on YAFFS_YAFFS2 ++ default y ++ help ++ Without this, you need to explicitely use yaffs2 as the file ++ system type. With this, you can say "yaffs" and yaffs or yaffs2 ++ will be used depending on the device page size (yaffs on ++ 512-byte page devices, yaffs2 on 2K page devices). ++ ++ If unsure, say Y. ++ ++config YAFFS_DISABLE_TAGS_ECC ++ bool "Disable yaffs from doing ECC on tags by default" ++ depends on YAFFS_FS && YAFFS_YAFFS2 ++ default n ++ help ++ This defaults yaffs to using its own ECC calculations on tags instead of ++ just relying on the MTD. ++ This behavior can also be overridden with tags_ecc_on and ++ tags_ecc_off mount options. ++ ++ If unsure, say N. ++ ++config YAFFS_ALWAYS_CHECK_CHUNK_ERASED ++ bool "Force chunk erase check" ++ depends on YAFFS_FS ++ default n ++ help ++ Normally yaffs only checks chunks before writing until an erased ++ chunk is found. This helps to detect any partially written ++ chunks that might have happened due to power loss. ++ ++ Enabling this forces on the test that chunks are erased in flash ++ before writing to them. This takes more time but is potentially ++ a bit more secure. ++ ++ Suggest setting Y during development and ironing out driver ++ issues etc. Suggest setting to N if you want faster writing. ++ ++ If unsure, say Y. ++ ++config YAFFS_EMPTY_LOST_AND_FOUND ++ bool "Empty lost and found on boot" ++ depends on YAFFS_FS ++ default n ++ help ++ If this is enabled then the contents of lost and found is ++ automatically dumped at mount. ++ ++ If unsure, say N. ++ ++config YAFFS_DISABLE_BLOCK_REFRESHING ++ bool "Disable yaffs2 block refreshing" ++ depends on YAFFS_FS ++ default n ++ help ++ If this is set, then block refreshing is disabled. ++ Block refreshing infrequently refreshes the oldest block in ++ a yaffs2 file system. This mechanism helps to refresh flash to ++ mitigate against data loss. This is particularly useful for MLC. ++ ++ If unsure, say N. ++ ++config YAFFS_DISABLE_BACKGROUND ++ bool "Disable yaffs2 background processing" ++ depends on YAFFS_FS ++ default n ++ help ++ If this is set, then background processing is disabled. ++ Background processing makes many foreground activities faster. ++ ++ If unsure, say N. ++ ++config YAFFS_DISABLE_BAD_BLOCK_MARKING ++ bool "Disable yaffs2 bad block marking" ++ depends on YAFFS_FS ++ default n ++ help ++ Useful during early flash bring up to prevent problems causing ++ lots of bad block marking. ++ ++ If unsure, say N. ++ ++config YAFFS_XATTR ++ bool "Enable yaffs2 xattr support" ++ depends on YAFFS_FS ++ default y ++ help ++ If this is set then yaffs2 will provide xattr support. ++ If unsure, say Y. +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/Makefile linux-3.15-rc5/fs/yaffs2/Makefile +--- linux-3.15-rc5.orig/fs/yaffs2/Makefile 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/Makefile 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,18 @@ ++# ++# Makefile for the linux YAFFS filesystem routines. ++# ++ ++obj-$(CONFIG_YAFFS_FS) += yaffs.o ++ ++yaffs-y := yaffs_ecc.o yaffs_vfs.o yaffs_guts.o yaffs_checkptrw.o ++yaffs-y += yaffs_packedtags1.o yaffs_packedtags2.o yaffs_nand.o ++yaffs-y += yaffs_tagscompat.o yaffs_tagsmarshall.o ++yaffs-y += yaffs_mtdif.o ++yaffs-y += yaffs_nameval.o yaffs_attribs.o ++yaffs-y += yaffs_allocator.o ++yaffs-y += yaffs_yaffs1.o ++yaffs-y += yaffs_yaffs2.o ++yaffs-y += yaffs_bitmap.o ++yaffs-y += yaffs_summary.o ++yaffs-y += yaffs_verify.o ++ +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_allocator.c linux-3.15-rc5/fs/yaffs2/yaffs_allocator.c +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_allocator.c 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_allocator.c 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,357 @@ ++/* ++ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU General Public License version 2 as ++ * published by the Free Software Foundation. ++ */ ++ ++#include "yaffs_allocator.h" ++#include "yaffs_guts.h" ++#include "yaffs_trace.h" ++#include "yportenv.h" ++ ++/* ++ * Each entry in yaffs_tnode_list and yaffs_obj_list hold blocks ++ * of approx 100 objects that are themn allocated singly. ++ * This is basically a simplified slab allocator. ++ * ++ * We don't use the Linux slab allocator because slab does not allow ++ * us to dump all the objects in one hit when we do a umount and tear ++ * down all the tnodes and objects. slab requires that we first free ++ * the individual objects. ++ * ++ * Once yaffs has been mainlined I shall try to motivate for a change ++ * to slab to provide the extra features we need here. ++ */ ++ ++struct yaffs_tnode_list { ++ struct yaffs_tnode_list *next; ++ struct yaffs_tnode *tnodes; ++}; ++ ++struct yaffs_obj_list { ++ struct yaffs_obj_list *next; ++ struct yaffs_obj *objects; ++}; ++ ++struct yaffs_allocator { ++ int n_tnodes_created; ++ struct yaffs_tnode *free_tnodes; ++ int n_free_tnodes; ++ struct yaffs_tnode_list *alloc_tnode_list; ++ ++ int n_obj_created; ++ struct list_head free_objs; ++ int n_free_objects; ++ ++ struct yaffs_obj_list *allocated_obj_list; ++}; ++ ++static void yaffs_deinit_raw_tnodes(struct yaffs_dev *dev) ++{ ++ struct yaffs_allocator *allocator = ++ (struct yaffs_allocator *)dev->allocator; ++ struct yaffs_tnode_list *tmp; ++ ++ if (!allocator) { ++ BUG(); ++ return; ++ } ++ ++ while (allocator->alloc_tnode_list) { ++ tmp = allocator->alloc_tnode_list->next; ++ ++ kfree(allocator->alloc_tnode_list->tnodes); ++ kfree(allocator->alloc_tnode_list); ++ allocator->alloc_tnode_list = tmp; ++ } ++ ++ allocator->free_tnodes = NULL; ++ allocator->n_free_tnodes = 0; ++ allocator->n_tnodes_created = 0; ++} ++ ++static void yaffs_init_raw_tnodes(struct yaffs_dev *dev) ++{ ++ struct yaffs_allocator *allocator = dev->allocator; ++ ++ if (!allocator) { ++ BUG(); ++ return; ++ } ++ ++ allocator->alloc_tnode_list = NULL; ++ allocator->free_tnodes = NULL; ++ allocator->n_free_tnodes = 0; ++ allocator->n_tnodes_created = 0; ++} ++ ++static int yaffs_create_tnodes(struct yaffs_dev *dev, int n_tnodes) ++{ ++ struct yaffs_allocator *allocator = ++ (struct yaffs_allocator *)dev->allocator; ++ int i; ++ struct yaffs_tnode *new_tnodes; ++ u8 *mem; ++ struct yaffs_tnode *curr; ++ struct yaffs_tnode *next; ++ struct yaffs_tnode_list *tnl; ++ ++ if (!allocator) { ++ BUG(); ++ return YAFFS_FAIL; ++ } ++ ++ if (n_tnodes < 1) ++ return YAFFS_OK; ++ ++ /* make these things */ ++ new_tnodes = kmalloc(n_tnodes * dev->tnode_size, GFP_NOFS); ++ mem = (u8 *) new_tnodes; ++ ++ if (!new_tnodes) { ++ yaffs_trace(YAFFS_TRACE_ERROR, ++ "yaffs: Could not allocate Tnodes"); ++ return YAFFS_FAIL; ++ } ++ ++ /* New hookup for wide tnodes */ ++ for (i = 0; i < n_tnodes - 1; i++) { ++ curr = (struct yaffs_tnode *)&mem[i * dev->tnode_size]; ++ next = (struct yaffs_tnode *)&mem[(i + 1) * dev->tnode_size]; ++ curr->internal[0] = next; ++ } ++ ++ curr = (struct yaffs_tnode *)&mem[(n_tnodes - 1) * dev->tnode_size]; ++ curr->internal[0] = allocator->free_tnodes; ++ allocator->free_tnodes = (struct yaffs_tnode *)mem; ++ ++ allocator->n_free_tnodes += n_tnodes; ++ allocator->n_tnodes_created += n_tnodes; ++ ++ /* Now add this bunch of tnodes to a list for freeing up. ++ * NB If we can't add this to the management list it isn't fatal ++ * but it just means we can't free this bunch of tnodes later. ++ */ ++ tnl = kmalloc(sizeof(struct yaffs_tnode_list), GFP_NOFS); ++ if (!tnl) { ++ yaffs_trace(YAFFS_TRACE_ERROR, ++ "Could not add tnodes to management list"); ++ return YAFFS_FAIL; ++ } else { ++ tnl->tnodes = new_tnodes; ++ tnl->next = allocator->alloc_tnode_list; ++ allocator->alloc_tnode_list = tnl; ++ } ++ ++ yaffs_trace(YAFFS_TRACE_ALLOCATE, "Tnodes added"); ++ ++ return YAFFS_OK; ++} ++ ++struct yaffs_tnode *yaffs_alloc_raw_tnode(struct yaffs_dev *dev) ++{ ++ struct yaffs_allocator *allocator = ++ (struct yaffs_allocator *)dev->allocator; ++ struct yaffs_tnode *tn = NULL; ++ ++ if (!allocator) { ++ BUG(); ++ return NULL; ++ } ++ ++ /* If there are none left make more */ ++ if (!allocator->free_tnodes) ++ yaffs_create_tnodes(dev, YAFFS_ALLOCATION_NTNODES); ++ ++ if (allocator->free_tnodes) { ++ tn = allocator->free_tnodes; ++ allocator->free_tnodes = allocator->free_tnodes->internal[0]; ++ allocator->n_free_tnodes--; ++ } ++ ++ return tn; ++} ++ ++/* FreeTnode frees up a tnode and puts it back on the free list */ ++void yaffs_free_raw_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn) ++{ ++ struct yaffs_allocator *allocator = dev->allocator; ++ ++ if (!allocator) { ++ BUG(); ++ return; ++ } ++ ++ if (tn) { ++ tn->internal[0] = allocator->free_tnodes; ++ allocator->free_tnodes = tn; ++ allocator->n_free_tnodes++; ++ } ++ dev->checkpoint_blocks_required = 0; /* force recalculation */ ++} ++ ++/*--------------- yaffs_obj alloaction ------------------------ ++ * ++ * Free yaffs_objs are stored in a list using obj->siblings. ++ * The blocks of allocated objects are stored in a linked list. ++ */ ++ ++static void yaffs_init_raw_objs(struct yaffs_dev *dev) ++{ ++ struct yaffs_allocator *allocator = dev->allocator; ++ ++ if (!allocator) { ++ BUG(); ++ return; ++ } ++ ++ allocator->allocated_obj_list = NULL; ++ INIT_LIST_HEAD(&allocator->free_objs); ++ allocator->n_free_objects = 0; ++} ++ ++static void yaffs_deinit_raw_objs(struct yaffs_dev *dev) ++{ ++ struct yaffs_allocator *allocator = dev->allocator; ++ struct yaffs_obj_list *tmp; ++ ++ if (!allocator) { ++ BUG(); ++ return; ++ } ++ ++ while (allocator->allocated_obj_list) { ++ tmp = allocator->allocated_obj_list->next; ++ kfree(allocator->allocated_obj_list->objects); ++ kfree(allocator->allocated_obj_list); ++ allocator->allocated_obj_list = tmp; ++ } ++ ++ INIT_LIST_HEAD(&allocator->free_objs); ++ allocator->n_free_objects = 0; ++ allocator->n_obj_created = 0; ++} ++ ++static int yaffs_create_free_objs(struct yaffs_dev *dev, int n_obj) ++{ ++ struct yaffs_allocator *allocator = dev->allocator; ++ int i; ++ struct yaffs_obj *new_objs; ++ struct yaffs_obj_list *list; ++ ++ if (!allocator) { ++ BUG(); ++ return YAFFS_FAIL; ++ } ++ ++ if (n_obj < 1) ++ return YAFFS_OK; ++ ++ /* make these things */ ++ new_objs = kmalloc(n_obj * sizeof(struct yaffs_obj), GFP_NOFS); ++ list = kmalloc(sizeof(struct yaffs_obj_list), GFP_NOFS); ++ ++ if (!new_objs || !list) { ++ kfree(new_objs); ++ new_objs = NULL; ++ kfree(list); ++ list = NULL; ++ yaffs_trace(YAFFS_TRACE_ALLOCATE, ++ "Could not allocate more objects"); ++ return YAFFS_FAIL; ++ } ++ ++ /* Hook them into the free list */ ++ for (i = 0; i < n_obj; i++) ++ list_add(&new_objs[i].siblings, &allocator->free_objs); ++ ++ allocator->n_free_objects += n_obj; ++ allocator->n_obj_created += n_obj; ++ ++ /* Now add this bunch of Objects to a list for freeing up. */ ++ ++ list->objects = new_objs; ++ list->next = allocator->allocated_obj_list; ++ allocator->allocated_obj_list = list; ++ ++ return YAFFS_OK; ++} ++ ++struct yaffs_obj *yaffs_alloc_raw_obj(struct yaffs_dev *dev) ++{ ++ struct yaffs_obj *obj = NULL; ++ struct list_head *lh; ++ struct yaffs_allocator *allocator = dev->allocator; ++ ++ if (!allocator) { ++ BUG(); ++ return obj; ++ } ++ ++ /* If there are none left make more */ ++ if (list_empty(&allocator->free_objs)) ++ yaffs_create_free_objs(dev, YAFFS_ALLOCATION_NOBJECTS); ++ ++ if (!list_empty(&allocator->free_objs)) { ++ lh = allocator->free_objs.next; ++ obj = list_entry(lh, struct yaffs_obj, siblings); ++ list_del_init(lh); ++ allocator->n_free_objects--; ++ } ++ ++ return obj; ++} ++ ++void yaffs_free_raw_obj(struct yaffs_dev *dev, struct yaffs_obj *obj) ++{ ++ ++ struct yaffs_allocator *allocator = dev->allocator; ++ ++ if (!allocator) { ++ BUG(); ++ return; ++ } ++ ++ /* Link into the free list. */ ++ list_add(&obj->siblings, &allocator->free_objs); ++ allocator->n_free_objects++; ++} ++ ++void yaffs_deinit_raw_tnodes_and_objs(struct yaffs_dev *dev) ++{ ++ ++ if (!dev->allocator) { ++ BUG(); ++ return; ++ } ++ ++ yaffs_deinit_raw_tnodes(dev); ++ yaffs_deinit_raw_objs(dev); ++ kfree(dev->allocator); ++ dev->allocator = NULL; ++} ++ ++void yaffs_init_raw_tnodes_and_objs(struct yaffs_dev *dev) ++{ ++ struct yaffs_allocator *allocator; ++ ++ if (dev->allocator) { ++ BUG(); ++ return; ++ } ++ ++ allocator = kmalloc(sizeof(struct yaffs_allocator), GFP_NOFS); ++ if (allocator) { ++ dev->allocator = allocator; ++ yaffs_init_raw_tnodes(dev); ++ yaffs_init_raw_objs(dev); ++ } ++} ++ +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_allocator.h linux-3.15-rc5/fs/yaffs2/yaffs_allocator.h +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_allocator.h 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_allocator.h 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,30 @@ ++/* ++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU Lesser General Public License version 2.1 as ++ * published by the Free Software Foundation. ++ * ++ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. ++ */ ++ ++#ifndef __YAFFS_ALLOCATOR_H__ ++#define __YAFFS_ALLOCATOR_H__ ++ ++#include "yaffs_guts.h" ++ ++void yaffs_init_raw_tnodes_and_objs(struct yaffs_dev *dev); ++void yaffs_deinit_raw_tnodes_and_objs(struct yaffs_dev *dev); ++ ++struct yaffs_tnode *yaffs_alloc_raw_tnode(struct yaffs_dev *dev); ++void yaffs_free_raw_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn); ++ ++struct yaffs_obj *yaffs_alloc_raw_obj(struct yaffs_dev *dev); ++void yaffs_free_raw_obj(struct yaffs_dev *dev, struct yaffs_obj *obj); ++ ++#endif +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_attribs.c linux-3.15-rc5/fs/yaffs2/yaffs_attribs.c +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_attribs.c 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_attribs.c 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,166 @@ ++/* ++ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU General Public License version 2 as ++ * published by the Free Software Foundation. ++ */ ++ ++#include "yaffs_guts.h" ++#include "yaffs_attribs.h" ++ ++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0)) ++static inline uid_t ia_uid_read(const struct iattr *iattr) ++{ ++ return from_kuid(&init_user_ns, iattr->ia_uid); ++} ++ ++static inline gid_t ia_gid_read(const struct iattr *iattr) ++{ ++ return from_kgid(&init_user_ns, iattr->ia_gid); ++} ++ ++static inline void ia_uid_write(struct iattr *iattr, uid_t uid) ++{ ++ iattr->ia_uid = make_kuid(&init_user_ns, uid); ++} ++ ++static inline void ia_gid_write(struct iattr *iattr, gid_t gid) ++{ ++ iattr->ia_gid = make_kgid(&init_user_ns, gid); ++} ++#else ++static inline uid_t ia_uid_read(const struct iattr *iattr) ++{ ++ return iattr->ia_uid; ++} ++ ++static inline gid_t ia_gid_read(const struct iattr *inode) ++{ ++ return iattr->ia_gid; ++} ++ ++static inline void ia_uid_write(struct iattr *iattr, uid_t uid) ++{ ++ iattr->ia_uid = uid; ++} ++ ++static inline void ia_gid_write(struct iattr *iattr, gid_t gid) ++{ ++ iattr->ia_gid = gid; ++} ++#endif ++ ++void yaffs_load_attribs(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh) ++{ ++ obj->yst_uid = oh->yst_uid; ++ obj->yst_gid = oh->yst_gid; ++ obj->yst_atime = oh->yst_atime; ++ obj->yst_mtime = oh->yst_mtime; ++ obj->yst_ctime = oh->yst_ctime; ++ obj->yst_rdev = oh->yst_rdev; ++} ++ ++void yaffs_load_attribs_oh(struct yaffs_obj_hdr *oh, struct yaffs_obj *obj) ++{ ++ oh->yst_uid = obj->yst_uid; ++ oh->yst_gid = obj->yst_gid; ++ oh->yst_atime = obj->yst_atime; ++ oh->yst_mtime = obj->yst_mtime; ++ oh->yst_ctime = obj->yst_ctime; ++ oh->yst_rdev = obj->yst_rdev; ++ ++} ++ ++void yaffs_load_current_time(struct yaffs_obj *obj, int do_a, int do_c) ++{ ++ obj->yst_mtime = Y_CURRENT_TIME; ++ if (do_a) ++ obj->yst_atime = obj->yst_mtime; ++ if (do_c) ++ obj->yst_ctime = obj->yst_mtime; ++} ++ ++void yaffs_attribs_init(struct yaffs_obj *obj, u32 gid, u32 uid, u32 rdev) ++{ ++ yaffs_load_current_time(obj, 1, 1); ++ obj->yst_rdev = rdev; ++ obj->yst_uid = uid; ++ obj->yst_gid = gid; ++} ++ ++static loff_t yaffs_get_file_size(struct yaffs_obj *obj) ++{ ++ YCHAR *alias = NULL; ++ obj = yaffs_get_equivalent_obj(obj); ++ ++ switch (obj->variant_type) { ++ case YAFFS_OBJECT_TYPE_FILE: ++ return obj->variant.file_variant.file_size; ++ case YAFFS_OBJECT_TYPE_SYMLINK: ++ alias = obj->variant.symlink_variant.alias; ++ if (!alias) ++ return 0; ++ return strnlen(alias, YAFFS_MAX_ALIAS_LENGTH); ++ default: ++ return 0; ++ } ++} ++ ++int yaffs_set_attribs(struct yaffs_obj *obj, struct iattr *attr) ++{ ++ unsigned int valid = attr->ia_valid; ++ ++ if (valid & ATTR_MODE) ++ obj->yst_mode = attr->ia_mode; ++ if (valid & ATTR_UID) ++ obj->yst_uid = ia_uid_read(attr); ++ if (valid & ATTR_GID) ++ obj->yst_gid = ia_gid_read(attr); ++ ++ if (valid & ATTR_ATIME) ++ obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime); ++ if (valid & ATTR_CTIME) ++ obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime); ++ if (valid & ATTR_MTIME) ++ obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime); ++ ++ if (valid & ATTR_SIZE) ++ yaffs_resize_file(obj, attr->ia_size); ++ ++ yaffs_update_oh(obj, NULL, 1, 0, 0, NULL); ++ ++ return YAFFS_OK; ++ ++} ++ ++int yaffs_get_attribs(struct yaffs_obj *obj, struct iattr *attr) ++{ ++ unsigned int valid = 0; ++ ++ attr->ia_mode = obj->yst_mode; ++ valid |= ATTR_MODE; ++ ia_uid_write(attr, obj->yst_uid); ++ valid |= ATTR_UID; ++ ia_gid_write(attr, obj->yst_gid); ++ valid |= ATTR_GID; ++ ++ Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime; ++ valid |= ATTR_ATIME; ++ Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime; ++ valid |= ATTR_CTIME; ++ Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime; ++ valid |= ATTR_MTIME; ++ ++ attr->ia_size = yaffs_get_file_size(obj); ++ valid |= ATTR_SIZE; ++ ++ attr->ia_valid = valid; ++ ++ return YAFFS_OK; ++} +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_attribs.h linux-3.15-rc5/fs/yaffs2/yaffs_attribs.h +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_attribs.h 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_attribs.h 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,28 @@ ++/* ++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU Lesser General Public License version 2.1 as ++ * published by the Free Software Foundation. ++ * ++ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. ++ */ ++ ++#ifndef __YAFFS_ATTRIBS_H__ ++#define __YAFFS_ATTRIBS_H__ ++ ++#include "yaffs_guts.h" ++ ++void yaffs_load_attribs(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh); ++void yaffs_load_attribs_oh(struct yaffs_obj_hdr *oh, struct yaffs_obj *obj); ++void yaffs_attribs_init(struct yaffs_obj *obj, u32 gid, u32 uid, u32 rdev); ++void yaffs_load_current_time(struct yaffs_obj *obj, int do_a, int do_c); ++int yaffs_set_attribs(struct yaffs_obj *obj, struct iattr *attr); ++int yaffs_get_attribs(struct yaffs_obj *obj, struct iattr *attr); ++ ++#endif +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_bitmap.c linux-3.15-rc5/fs/yaffs2/yaffs_bitmap.c +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_bitmap.c 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_bitmap.c 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,97 @@ ++/* ++ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU General Public License version 2 as ++ * published by the Free Software Foundation. ++ */ ++ ++#include "yaffs_bitmap.h" ++#include "yaffs_trace.h" ++/* ++ * Chunk bitmap manipulations ++ */ ++ ++static inline u8 *yaffs_block_bits(struct yaffs_dev *dev, int blk) ++{ ++ if (blk < dev->internal_start_block || blk > dev->internal_end_block) { ++ yaffs_trace(YAFFS_TRACE_ERROR, ++ "BlockBits block %d is not valid", ++ blk); ++ BUG(); ++ } ++ return dev->chunk_bits + ++ (dev->chunk_bit_stride * (blk - dev->internal_start_block)); ++} ++ ++void yaffs_verify_chunk_bit_id(struct yaffs_dev *dev, int blk, int chunk) ++{ ++ if (blk < dev->internal_start_block || blk > dev->internal_end_block || ++ chunk < 0 || chunk >= dev->param.chunks_per_block) { ++ yaffs_trace(YAFFS_TRACE_ERROR, ++ "Chunk Id (%d:%d) invalid", ++ blk, chunk); ++ BUG(); ++ } ++} ++ ++void yaffs_clear_chunk_bits(struct yaffs_dev *dev, int blk) ++{ ++ u8 *blk_bits = yaffs_block_bits(dev, blk); ++ ++ memset(blk_bits, 0, dev->chunk_bit_stride); ++} ++ ++void yaffs_clear_chunk_bit(struct yaffs_dev *dev, int blk, int chunk) ++{ ++ u8 *blk_bits = yaffs_block_bits(dev, blk); ++ ++ yaffs_verify_chunk_bit_id(dev, blk, chunk); ++ blk_bits[chunk / 8] &= ~(1 << (chunk & 7)); ++} ++ ++void yaffs_set_chunk_bit(struct yaffs_dev *dev, int blk, int chunk) ++{ ++ u8 *blk_bits = yaffs_block_bits(dev, blk); ++ ++ yaffs_verify_chunk_bit_id(dev, blk, chunk); ++ blk_bits[chunk / 8] |= (1 << (chunk & 7)); ++} ++ ++int yaffs_check_chunk_bit(struct yaffs_dev *dev, int blk, int chunk) ++{ ++ u8 *blk_bits = yaffs_block_bits(dev, blk); ++ ++ yaffs_verify_chunk_bit_id(dev, blk, chunk); ++ return (blk_bits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0; ++} ++ ++int yaffs_still_some_chunks(struct yaffs_dev *dev, int blk) ++{ ++ u8 *blk_bits = yaffs_block_bits(dev, blk); ++ int i; ++ ++ for (i = 0; i < dev->chunk_bit_stride; i++) { ++ if (*blk_bits) ++ return 1; ++ blk_bits++; ++ } ++ return 0; ++} ++ ++int yaffs_count_chunk_bits(struct yaffs_dev *dev, int blk) ++{ ++ u8 *blk_bits = yaffs_block_bits(dev, blk); ++ int i; ++ int n = 0; ++ ++ for (i = 0; i < dev->chunk_bit_stride; i++, blk_bits++) ++ n += hweight8(*blk_bits); ++ ++ return n; ++} +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_bitmap.h linux-3.15-rc5/fs/yaffs2/yaffs_bitmap.h +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_bitmap.h 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_bitmap.h 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,33 @@ ++/* ++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU Lesser General Public License version 2.1 as ++ * published by the Free Software Foundation. ++ * ++ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. ++ */ ++ ++/* ++ * Chunk bitmap manipulations ++ */ ++ ++#ifndef __YAFFS_BITMAP_H__ ++#define __YAFFS_BITMAP_H__ ++ ++#include "yaffs_guts.h" ++ ++void yaffs_verify_chunk_bit_id(struct yaffs_dev *dev, int blk, int chunk); ++void yaffs_clear_chunk_bits(struct yaffs_dev *dev, int blk); ++void yaffs_clear_chunk_bit(struct yaffs_dev *dev, int blk, int chunk); ++void yaffs_set_chunk_bit(struct yaffs_dev *dev, int blk, int chunk); ++int yaffs_check_chunk_bit(struct yaffs_dev *dev, int blk, int chunk); ++int yaffs_still_some_chunks(struct yaffs_dev *dev, int blk); ++int yaffs_count_chunk_bits(struct yaffs_dev *dev, int blk); ++ ++#endif +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_checkptrw.c linux-3.15-rc5/fs/yaffs2/yaffs_checkptrw.c +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_checkptrw.c 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_checkptrw.c 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,474 @@ ++/* ++ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU General Public License version 2 as ++ * published by the Free Software Foundation. ++ */ ++ ++#include "yaffs_checkptrw.h" ++#include "yaffs_getblockinfo.h" ++ ++struct yaffs_checkpt_chunk_hdr { ++ int version; ++ int seq; ++ u32 sum; ++ u32 xor; ++} ; ++ ++ ++static int apply_chunk_offset(struct yaffs_dev *dev, int chunk) ++{ ++ return chunk - dev->chunk_offset; ++} ++ ++static int apply_block_offset(struct yaffs_dev *dev, int block) ++{ ++ return block - dev->block_offset; ++} ++ ++static void yaffs2_checkpt_init_chunk_hdr(struct yaffs_dev *dev) ++{ ++ struct yaffs_checkpt_chunk_hdr hdr; ++ ++ hdr.version = YAFFS_CHECKPOINT_VERSION; ++ hdr.seq = dev->checkpt_page_seq; ++ hdr.sum = dev->checkpt_sum; ++ hdr.xor = dev->checkpt_xor; ++ ++ dev->checkpt_byte_offs = sizeof(hdr); ++ ++ memcpy(dev->checkpt_buffer, &hdr, sizeof(hdr)); ++} ++ ++static int yaffs2_checkpt_check_chunk_hdr(struct yaffs_dev *dev) ++{ ++ struct yaffs_checkpt_chunk_hdr hdr; ++ ++ memcpy(&hdr, dev->checkpt_buffer, sizeof(hdr)); ++ ++ dev->checkpt_byte_offs = sizeof(hdr); ++ ++ return hdr.version == YAFFS_CHECKPOINT_VERSION && ++ hdr.seq == dev->checkpt_page_seq && ++ hdr.sum == dev->checkpt_sum && ++ hdr.xor == dev->checkpt_xor; ++} ++ ++static int yaffs2_checkpt_space_ok(struct yaffs_dev *dev) ++{ ++ int blocks_avail = dev->n_erased_blocks - dev->param.n_reserved_blocks; ++ ++ yaffs_trace(YAFFS_TRACE_CHECKPOINT, ++ "checkpt blocks_avail = %d", blocks_avail); ++ ++ return (blocks_avail <= 0) ? 0 : 1; ++} ++ ++static int yaffs_checkpt_erase(struct yaffs_dev *dev) ++{ ++ int i; ++ ++ if (!dev->drv.drv_erase_fn) ++ return 0; ++ yaffs_trace(YAFFS_TRACE_CHECKPOINT, ++ "checking blocks %d to %d", ++ dev->internal_start_block, dev->internal_end_block); ++ ++ for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) { ++ struct yaffs_block_info *bi = yaffs_get_block_info(dev, i); ++ int offset_i = apply_block_offset(dev, i); ++ int result; ++ ++ if (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT) { ++ yaffs_trace(YAFFS_TRACE_CHECKPOINT, ++ "erasing checkpt block %d", i); ++ ++ dev->n_erasures++; ++ ++ result = dev->drv.drv_erase_fn(dev, offset_i); ++ if(result) { ++ bi->block_state = YAFFS_BLOCK_STATE_EMPTY; ++ dev->n_erased_blocks++; ++ dev->n_free_chunks += ++ dev->param.chunks_per_block; ++ } else { ++ dev->drv.drv_mark_bad_fn(dev, offset_i); ++ bi->block_state = YAFFS_BLOCK_STATE_DEAD; ++ } ++ } ++ } ++ ++ dev->blocks_in_checkpt = 0; ++ ++ return 1; ++} ++ ++static void yaffs2_checkpt_find_erased_block(struct yaffs_dev *dev) ++{ ++ int i; ++ int blocks_avail = dev->n_erased_blocks - dev->param.n_reserved_blocks; ++ ++ yaffs_trace(YAFFS_TRACE_CHECKPOINT, ++ "allocating checkpt block: erased %d reserved %d avail %d next %d ", ++ dev->n_erased_blocks, dev->param.n_reserved_blocks, ++ blocks_avail, dev->checkpt_next_block); ++ ++ if (dev->checkpt_next_block >= 0 && ++ dev->checkpt_next_block <= dev->internal_end_block && ++ blocks_avail > 0) { ++ ++ for (i = dev->checkpt_next_block; i <= dev->internal_end_block; ++ i++) { ++ struct yaffs_block_info *bi; ++ ++ bi = yaffs_get_block_info(dev, i); ++ if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) { ++ dev->checkpt_next_block = i + 1; ++ dev->checkpt_cur_block = i; ++ yaffs_trace(YAFFS_TRACE_CHECKPOINT, ++ "allocating checkpt block %d", i); ++ return; ++ } ++ } ++ } ++ yaffs_trace(YAFFS_TRACE_CHECKPOINT, "out of checkpt blocks"); ++ ++ dev->checkpt_next_block = -1; ++ dev->checkpt_cur_block = -1; ++} ++ ++static void yaffs2_checkpt_find_block(struct yaffs_dev *dev) ++{ ++ int i; ++ struct yaffs_ext_tags tags; ++ ++ yaffs_trace(YAFFS_TRACE_CHECKPOINT, ++ "find next checkpt block: start: blocks %d next %d", ++ dev->blocks_in_checkpt, dev->checkpt_next_block); ++ ++ if (dev->blocks_in_checkpt < dev->checkpt_max_blocks) ++ for (i = dev->checkpt_next_block; i <= dev->internal_end_block; ++ i++) { ++ int chunk = i * dev->param.chunks_per_block; ++ enum yaffs_block_state state; ++ u32 seq; ++ ++ dev->tagger.read_chunk_tags_fn(dev, ++ apply_chunk_offset(dev, chunk), ++ NULL, &tags); ++ yaffs_trace(YAFFS_TRACE_CHECKPOINT, ++ "find next checkpt block: search: block %d state %d oid %d seq %d eccr %d", ++ i, (int) state, ++ tags.obj_id, tags.seq_number, ++ tags.ecc_result); ++ ++ if (tags.seq_number != YAFFS_SEQUENCE_CHECKPOINT_DATA) ++ continue; ++ ++ dev->tagger.query_block_fn(dev, ++ apply_block_offset(dev, i), ++ &state, &seq); ++ if (state == YAFFS_BLOCK_STATE_DEAD) ++ continue; ++ ++ /* Right kind of block */ ++ dev->checkpt_next_block = tags.obj_id; ++ dev->checkpt_cur_block = i; ++ dev->checkpt_block_list[dev->blocks_in_checkpt] = i; ++ dev->blocks_in_checkpt++; ++ yaffs_trace(YAFFS_TRACE_CHECKPOINT, ++ "found checkpt block %d", i); ++ return; ++ } ++ ++ yaffs_trace(YAFFS_TRACE_CHECKPOINT, "found no more checkpt blocks"); ++ ++ dev->checkpt_next_block = -1; ++ dev->checkpt_cur_block = -1; ++} ++ ++int yaffs2_checkpt_open(struct yaffs_dev *dev, int writing) ++{ ++ int i; ++ ++ dev->checkpt_open_write = writing; ++ ++ /* Got the functions we need? */ ++ if (!dev->tagger.write_chunk_tags_fn || ++ !dev->tagger.read_chunk_tags_fn || ++ !dev->drv.drv_erase_fn || ++ !dev->drv.drv_mark_bad_fn) ++ return 0; ++ ++ if (writing && !yaffs2_checkpt_space_ok(dev)) ++ return 0; ++ ++ if (!dev->checkpt_buffer) ++ dev->checkpt_buffer = ++ kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS); ++ if (!dev->checkpt_buffer) ++ return 0; ++ ++ dev->checkpt_page_seq = 0; ++ dev->checkpt_byte_count = 0; ++ dev->checkpt_sum = 0; ++ dev->checkpt_xor = 0; ++ dev->checkpt_cur_block = -1; ++ dev->checkpt_cur_chunk = -1; ++ dev->checkpt_next_block = dev->internal_start_block; ++ ++ if (writing) { ++ memset(dev->checkpt_buffer, 0, dev->data_bytes_per_chunk); ++ yaffs2_checkpt_init_chunk_hdr(dev); ++ return yaffs_checkpt_erase(dev); ++ } ++ ++ /* Opening for a read */ ++ /* Set to a value that will kick off a read */ ++ dev->checkpt_byte_offs = dev->data_bytes_per_chunk; ++ /* A checkpoint block list of 1 checkpoint block per 16 block is ++ * (hopefully) going to be way more than we need */ ++ dev->blocks_in_checkpt = 0; ++ dev->checkpt_max_blocks = ++ (dev->internal_end_block - dev->internal_start_block) / 16 + 2; ++ dev->checkpt_block_list = ++ kmalloc(sizeof(int) * dev->checkpt_max_blocks, GFP_NOFS); ++ ++ if (!dev->checkpt_block_list) ++ return 0; ++ ++ for (i = 0; i < dev->checkpt_max_blocks; i++) ++ dev->checkpt_block_list[i] = -1; ++ ++ return 1; ++} ++ ++int yaffs2_get_checkpt_sum(struct yaffs_dev *dev, u32 * sum) ++{ ++ u32 composite_sum; ++ ++ composite_sum = (dev->checkpt_sum << 8) | (dev->checkpt_xor & 0xff); ++ *sum = composite_sum; ++ return 1; ++} ++ ++static int yaffs2_checkpt_flush_buffer(struct yaffs_dev *dev) ++{ ++ int chunk; ++ int offset_chunk; ++ struct yaffs_ext_tags tags; ++ ++ if (dev->checkpt_cur_block < 0) { ++ yaffs2_checkpt_find_erased_block(dev); ++ dev->checkpt_cur_chunk = 0; ++ } ++ ++ if (dev->checkpt_cur_block < 0) ++ return 0; ++ ++ tags.is_deleted = 0; ++ tags.obj_id = dev->checkpt_next_block; /* Hint to next place to look */ ++ tags.chunk_id = dev->checkpt_page_seq + 1; ++ tags.seq_number = YAFFS_SEQUENCE_CHECKPOINT_DATA; ++ tags.n_bytes = dev->data_bytes_per_chunk; ++ if (dev->checkpt_cur_chunk == 0) { ++ /* First chunk we write for the block? Set block state to ++ checkpoint */ ++ struct yaffs_block_info *bi = ++ yaffs_get_block_info(dev, dev->checkpt_cur_block); ++ bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT; ++ dev->blocks_in_checkpt++; ++ } ++ ++ chunk = ++ dev->checkpt_cur_block * dev->param.chunks_per_block + ++ dev->checkpt_cur_chunk; ++ ++ yaffs_trace(YAFFS_TRACE_CHECKPOINT, ++ "checkpoint wite buffer nand %d(%d:%d) objid %d chId %d", ++ chunk, dev->checkpt_cur_block, dev->checkpt_cur_chunk, ++ tags.obj_id, tags.chunk_id); ++ ++ offset_chunk = apply_chunk_offset(dev, chunk); ++ ++ dev->n_page_writes++; ++ ++ dev->tagger.write_chunk_tags_fn(dev, offset_chunk, ++ dev->checkpt_buffer, &tags); ++ dev->checkpt_page_seq++; ++ dev->checkpt_cur_chunk++; ++ if (dev->checkpt_cur_chunk >= dev->param.chunks_per_block) { ++ dev->checkpt_cur_chunk = 0; ++ dev->checkpt_cur_block = -1; ++ } ++ memset(dev->checkpt_buffer, 0, dev->data_bytes_per_chunk); ++ ++ yaffs2_checkpt_init_chunk_hdr(dev); ++ ++ ++ return 1; ++} ++ ++int yaffs2_checkpt_wr(struct yaffs_dev *dev, const void *data, int n_bytes) ++{ ++ int i = 0; ++ int ok = 1; ++ u8 *data_bytes = (u8 *) data; ++ ++ if (!dev->checkpt_buffer) ++ return 0; ++ ++ if (!dev->checkpt_open_write) ++ return -1; ++ ++ while (i < n_bytes && ok) { ++ dev->checkpt_buffer[dev->checkpt_byte_offs] = *data_bytes; ++ dev->checkpt_sum += *data_bytes; ++ dev->checkpt_xor ^= *data_bytes; ++ ++ dev->checkpt_byte_offs++; ++ i++; ++ data_bytes++; ++ dev->checkpt_byte_count++; ++ ++ if (dev->checkpt_byte_offs < 0 || ++ dev->checkpt_byte_offs >= dev->data_bytes_per_chunk) ++ ok = yaffs2_checkpt_flush_buffer(dev); ++ } ++ ++ return i; ++} ++ ++int yaffs2_checkpt_rd(struct yaffs_dev *dev, void *data, int n_bytes) ++{ ++ int i = 0; ++ int ok = 1; ++ struct yaffs_ext_tags tags; ++ int chunk; ++ int offset_chunk; ++ u8 *data_bytes = (u8 *) data; ++ ++ if (!dev->checkpt_buffer) ++ return 0; ++ ++ if (dev->checkpt_open_write) ++ return -1; ++ ++ while (i < n_bytes && ok) { ++ ++ if (dev->checkpt_byte_offs < 0 || ++ dev->checkpt_byte_offs >= dev->data_bytes_per_chunk) { ++ ++ if (dev->checkpt_cur_block < 0) { ++ yaffs2_checkpt_find_block(dev); ++ dev->checkpt_cur_chunk = 0; ++ } ++ ++ if (dev->checkpt_cur_block < 0) { ++ ok = 0; ++ break; ++ } ++ ++ chunk = dev->checkpt_cur_block * ++ dev->param.chunks_per_block + ++ dev->checkpt_cur_chunk; ++ ++ offset_chunk = apply_chunk_offset(dev, chunk); ++ dev->n_page_reads++; ++ ++ /* read in the next chunk */ ++ dev->tagger.read_chunk_tags_fn(dev, ++ offset_chunk, ++ dev->checkpt_buffer, ++ &tags); ++ ++ if (tags.chunk_id != (dev->checkpt_page_seq + 1) || ++ tags.ecc_result > YAFFS_ECC_RESULT_FIXED || ++ tags.seq_number != YAFFS_SEQUENCE_CHECKPOINT_DATA) { ++ ok = 0; ++ break; ++ } ++ if(!yaffs2_checkpt_check_chunk_hdr(dev)) { ++ ok = 0; ++ break; ++ } ++ ++ dev->checkpt_page_seq++; ++ dev->checkpt_cur_chunk++; ++ ++ if (dev->checkpt_cur_chunk >= ++ dev->param.chunks_per_block) ++ dev->checkpt_cur_block = -1; ++ ++ } ++ ++ *data_bytes = dev->checkpt_buffer[dev->checkpt_byte_offs]; ++ dev->checkpt_sum += *data_bytes; ++ dev->checkpt_xor ^= *data_bytes; ++ dev->checkpt_byte_offs++; ++ i++; ++ data_bytes++; ++ dev->checkpt_byte_count++; ++ } ++ ++ return i; ++} ++ ++int yaffs_checkpt_close(struct yaffs_dev *dev) ++{ ++ int i; ++ ++ if (dev->checkpt_open_write) { ++ if (dev->checkpt_byte_offs != ++ sizeof(sizeof(struct yaffs_checkpt_chunk_hdr))) ++ yaffs2_checkpt_flush_buffer(dev); ++ } else if (dev->checkpt_block_list) { ++ for (i = 0; ++ i < dev->blocks_in_checkpt && ++ dev->checkpt_block_list[i] >= 0; i++) { ++ int blk = dev->checkpt_block_list[i]; ++ struct yaffs_block_info *bi = NULL; ++ ++ if (dev->internal_start_block <= blk && ++ blk <= dev->internal_end_block) ++ bi = yaffs_get_block_info(dev, blk); ++ if (bi && bi->block_state == YAFFS_BLOCK_STATE_EMPTY) ++ bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT; ++ } ++ kfree(dev->checkpt_block_list); ++ dev->checkpt_block_list = NULL; ++ } ++ ++ dev->n_free_chunks -= ++ dev->blocks_in_checkpt * dev->param.chunks_per_block; ++ dev->n_erased_blocks -= dev->blocks_in_checkpt; ++ ++ yaffs_trace(YAFFS_TRACE_CHECKPOINT, "checkpoint byte count %d", ++ dev->checkpt_byte_count); ++ ++ if (dev->checkpt_buffer) { ++ /* free the buffer */ ++ kfree(dev->checkpt_buffer); ++ dev->checkpt_buffer = NULL; ++ return 1; ++ } else { ++ return 0; ++ } ++} ++ ++int yaffs2_checkpt_invalidate_stream(struct yaffs_dev *dev) ++{ ++ /* Erase the checkpoint data */ ++ ++ yaffs_trace(YAFFS_TRACE_CHECKPOINT, ++ "checkpoint invalidate of %d blocks", ++ dev->blocks_in_checkpt); ++ ++ return yaffs_checkpt_erase(dev); ++} +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_checkptrw.h linux-3.15-rc5/fs/yaffs2/yaffs_checkptrw.h +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_checkptrw.h 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_checkptrw.h 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,33 @@ ++/* ++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU Lesser General Public License version 2.1 as ++ * published by the Free Software Foundation. ++ * ++ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. ++ */ ++ ++#ifndef __YAFFS_CHECKPTRW_H__ ++#define __YAFFS_CHECKPTRW_H__ ++ ++#include "yaffs_guts.h" ++ ++int yaffs2_checkpt_open(struct yaffs_dev *dev, int writing); ++ ++int yaffs2_checkpt_wr(struct yaffs_dev *dev, const void *data, int n_bytes); ++ ++int yaffs2_checkpt_rd(struct yaffs_dev *dev, void *data, int n_bytes); ++ ++int yaffs2_get_checkpt_sum(struct yaffs_dev *dev, u32 * sum); ++ ++int yaffs_checkpt_close(struct yaffs_dev *dev); ++ ++int yaffs2_checkpt_invalidate_stream(struct yaffs_dev *dev); ++ ++#endif +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_ecc.c linux-3.15-rc5/fs/yaffs2/yaffs_ecc.c +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_ecc.c 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_ecc.c 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,281 @@ ++/* ++ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU General Public License version 2 as ++ * published by the Free Software Foundation. ++ */ ++ ++/* ++ * This code implements the ECC algorithm used in SmartMedia. ++ * ++ * The ECC comprises 22 bits of parity information and is stuffed into 3 bytes. ++ * The two unused bit are set to 1. ++ * The ECC can correct single bit errors in a 256-byte page of data. Thus, two ++ * such ECC blocks are used on a 512-byte NAND page. ++ * ++ */ ++ ++#include "yportenv.h" ++ ++#include "yaffs_ecc.h" ++ ++/* Table generated by gen-ecc.c ++ * Using a table means we do not have to calculate p1..p4 and p1'..p4' ++ * for each byte of data. These are instead provided in a table in bits7..2. ++ * Bit 0 of each entry indicates whether the entry has an odd or even parity, ++ * and therefore this bytes influence on the line parity. ++ */ ++ ++static const unsigned char column_parity_table[] = { ++ 0x00, 0x55, 0x59, 0x0c, 0x65, 0x30, 0x3c, 0x69, ++ 0x69, 0x3c, 0x30, 0x65, 0x0c, 0x59, 0x55, 0x00, ++ 0x95, 0xc0, 0xcc, 0x99, 0xf0, 0xa5, 0xa9, 0xfc, ++ 0xfc, 0xa9, 0xa5, 0xf0, 0x99, 0xcc, 0xc0, 0x95, ++ 0x99, 0xcc, 0xc0, 0x95, 0xfc, 0xa9, 0xa5, 0xf0, ++ 0xf0, 0xa5, 0xa9, 0xfc, 0x95, 0xc0, 0xcc, 0x99, ++ 0x0c, 0x59, 0x55, 0x00, 0x69, 0x3c, 0x30, 0x65, ++ 0x65, 0x30, 0x3c, 0x69, 0x00, 0x55, 0x59, 0x0c, ++ 0xa5, 0xf0, 0xfc, 0xa9, 0xc0, 0x95, 0x99, 0xcc, ++ 0xcc, 0x99, 0x95, 0xc0, 0xa9, 0xfc, 0xf0, 0xa5, ++ 0x30, 0x65, 0x69, 0x3c, 0x55, 0x00, 0x0c, 0x59, ++ 0x59, 0x0c, 0x00, 0x55, 0x3c, 0x69, 0x65, 0x30, ++ 0x3c, 0x69, 0x65, 0x30, 0x59, 0x0c, 0x00, 0x55, ++ 0x55, 0x00, 0x0c, 0x59, 0x30, 0x65, 0x69, 0x3c, ++ 0xa9, 0xfc, 0xf0, 0xa5, 0xcc, 0x99, 0x95, 0xc0, ++ 0xc0, 0x95, 0x99, 0xcc, 0xa5, 0xf0, 0xfc, 0xa9, ++ 0xa9, 0xfc, 0xf0, 0xa5, 0xcc, 0x99, 0x95, 0xc0, ++ 0xc0, 0x95, 0x99, 0xcc, 0xa5, 0xf0, 0xfc, 0xa9, ++ 0x3c, 0x69, 0x65, 0x30, 0x59, 0x0c, 0x00, 0x55, ++ 0x55, 0x00, 0x0c, 0x59, 0x30, 0x65, 0x69, 0x3c, ++ 0x30, 0x65, 0x69, 0x3c, 0x55, 0x00, 0x0c, 0x59, ++ 0x59, 0x0c, 0x00, 0x55, 0x3c, 0x69, 0x65, 0x30, ++ 0xa5, 0xf0, 0xfc, 0xa9, 0xc0, 0x95, 0x99, 0xcc, ++ 0xcc, 0x99, 0x95, 0xc0, 0xa9, 0xfc, 0xf0, 0xa5, ++ 0x0c, 0x59, 0x55, 0x00, 0x69, 0x3c, 0x30, 0x65, ++ 0x65, 0x30, 0x3c, 0x69, 0x00, 0x55, 0x59, 0x0c, ++ 0x99, 0xcc, 0xc0, 0x95, 0xfc, 0xa9, 0xa5, 0xf0, ++ 0xf0, 0xa5, 0xa9, 0xfc, 0x95, 0xc0, 0xcc, 0x99, ++ 0x95, 0xc0, 0xcc, 0x99, 0xf0, 0xa5, 0xa9, 0xfc, ++ 0xfc, 0xa9, 0xa5, 0xf0, 0x99, 0xcc, 0xc0, 0x95, ++ 0x00, 0x55, 0x59, 0x0c, 0x65, 0x30, 0x3c, 0x69, ++ 0x69, 0x3c, 0x30, 0x65, 0x0c, 0x59, 0x55, 0x00, ++}; ++ ++ ++/* Calculate the ECC for a 256-byte block of data */ ++void yaffs_ecc_calc(const unsigned char *data, unsigned char *ecc) ++{ ++ unsigned int i; ++ unsigned char col_parity = 0; ++ unsigned char line_parity = 0; ++ unsigned char line_parity_prime = 0; ++ unsigned char t; ++ unsigned char b; ++ ++ for (i = 0; i < 256; i++) { ++ b = column_parity_table[*data++]; ++ col_parity ^= b; ++ ++ if (b & 0x01) { /* odd number of bits in the byte */ ++ line_parity ^= i; ++ line_parity_prime ^= ~i; ++ } ++ } ++ ++ ecc[2] = (~col_parity) | 0x03; ++ ++ t = 0; ++ if (line_parity & 0x80) ++ t |= 0x80; ++ if (line_parity_prime & 0x80) ++ t |= 0x40; ++ if (line_parity & 0x40) ++ t |= 0x20; ++ if (line_parity_prime & 0x40) ++ t |= 0x10; ++ if (line_parity & 0x20) ++ t |= 0x08; ++ if (line_parity_prime & 0x20) ++ t |= 0x04; ++ if (line_parity & 0x10) ++ t |= 0x02; ++ if (line_parity_prime & 0x10) ++ t |= 0x01; ++ ecc[1] = ~t; ++ ++ t = 0; ++ if (line_parity & 0x08) ++ t |= 0x80; ++ if (line_parity_prime & 0x08) ++ t |= 0x40; ++ if (line_parity & 0x04) ++ t |= 0x20; ++ if (line_parity_prime & 0x04) ++ t |= 0x10; ++ if (line_parity & 0x02) ++ t |= 0x08; ++ if (line_parity_prime & 0x02) ++ t |= 0x04; ++ if (line_parity & 0x01) ++ t |= 0x02; ++ if (line_parity_prime & 0x01) ++ t |= 0x01; ++ ecc[0] = ~t; ++ ++} ++ ++/* Correct the ECC on a 256 byte block of data */ ++ ++int yaffs_ecc_correct(unsigned char *data, unsigned char *read_ecc, ++ const unsigned char *test_ecc) ++{ ++ unsigned char d0, d1, d2; /* deltas */ ++ ++ d0 = read_ecc[0] ^ test_ecc[0]; ++ d1 = read_ecc[1] ^ test_ecc[1]; ++ d2 = read_ecc[2] ^ test_ecc[2]; ++ ++ if ((d0 | d1 | d2) == 0) ++ return 0; /* no error */ ++ ++ if (((d0 ^ (d0 >> 1)) & 0x55) == 0x55 && ++ ((d1 ^ (d1 >> 1)) & 0x55) == 0x55 && ++ ((d2 ^ (d2 >> 1)) & 0x54) == 0x54) { ++ /* Single bit (recoverable) error in data */ ++ ++ unsigned byte; ++ unsigned bit; ++ ++ bit = byte = 0; ++ ++ if (d1 & 0x80) ++ byte |= 0x80; ++ if (d1 & 0x20) ++ byte |= 0x40; ++ if (d1 & 0x08) ++ byte |= 0x20; ++ if (d1 & 0x02) ++ byte |= 0x10; ++ if (d0 & 0x80) ++ byte |= 0x08; ++ if (d0 & 0x20) ++ byte |= 0x04; ++ if (d0 & 0x08) ++ byte |= 0x02; ++ if (d0 & 0x02) ++ byte |= 0x01; ++ ++ if (d2 & 0x80) ++ bit |= 0x04; ++ if (d2 & 0x20) ++ bit |= 0x02; ++ if (d2 & 0x08) ++ bit |= 0x01; ++ ++ data[byte] ^= (1 << bit); ++ ++ return 1; /* Corrected the error */ ++ } ++ ++ if ((hweight8(d0) + hweight8(d1) + hweight8(d2)) == 1) { ++ /* Reccoverable error in ecc */ ++ ++ read_ecc[0] = test_ecc[0]; ++ read_ecc[1] = test_ecc[1]; ++ read_ecc[2] = test_ecc[2]; ++ ++ return 1; /* Corrected the error */ ++ } ++ ++ /* Unrecoverable error */ ++ ++ return -1; ++ ++} ++ ++/* ++ * ECCxxxOther does ECC calcs on arbitrary n bytes of data ++ */ ++void yaffs_ecc_calc_other(const unsigned char *data, unsigned n_bytes, ++ struct yaffs_ecc_other *ecc_other) ++{ ++ unsigned int i; ++ unsigned char col_parity = 0; ++ unsigned line_parity = 0; ++ unsigned line_parity_prime = 0; ++ unsigned char b; ++ ++ for (i = 0; i < n_bytes; i++) { ++ b = column_parity_table[*data++]; ++ col_parity ^= b; ++ ++ if (b & 0x01) { ++ /* odd number of bits in the byte */ ++ line_parity ^= i; ++ line_parity_prime ^= ~i; ++ } ++ ++ } ++ ++ ecc_other->col_parity = (col_parity >> 2) & 0x3f; ++ ecc_other->line_parity = line_parity; ++ ecc_other->line_parity_prime = line_parity_prime; ++} ++ ++int yaffs_ecc_correct_other(unsigned char *data, unsigned n_bytes, ++ struct yaffs_ecc_other *read_ecc, ++ const struct yaffs_ecc_other *test_ecc) ++{ ++ unsigned char delta_col; /* column parity delta */ ++ unsigned delta_line; /* line parity delta */ ++ unsigned delta_line_prime; /* line parity delta */ ++ unsigned bit; ++ ++ delta_col = read_ecc->col_parity ^ test_ecc->col_parity; ++ delta_line = read_ecc->line_parity ^ test_ecc->line_parity; ++ delta_line_prime = ++ read_ecc->line_parity_prime ^ test_ecc->line_parity_prime; ++ ++ if ((delta_col | delta_line | delta_line_prime) == 0) ++ return 0; /* no error */ ++ ++ if (delta_line == ~delta_line_prime && ++ (((delta_col ^ (delta_col >> 1)) & 0x15) == 0x15)) { ++ /* Single bit (recoverable) error in data */ ++ ++ bit = 0; ++ ++ if (delta_col & 0x20) ++ bit |= 0x04; ++ if (delta_col & 0x08) ++ bit |= 0x02; ++ if (delta_col & 0x02) ++ bit |= 0x01; ++ ++ if (delta_line >= n_bytes) ++ return -1; ++ ++ data[delta_line] ^= (1 << bit); ++ ++ return 1; /* corrected */ ++ } ++ ++ if ((hweight32(delta_line) + ++ hweight32(delta_line_prime) + ++ hweight8(delta_col)) == 1) { ++ /* Reccoverable error in ecc */ ++ ++ *read_ecc = *test_ecc; ++ return 1; /* corrected */ ++ } ++ ++ /* Unrecoverable error */ ++ ++ return -1; ++} +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_ecc.h linux-3.15-rc5/fs/yaffs2/yaffs_ecc.h +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_ecc.h 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_ecc.h 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,44 @@ ++/* ++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU Lesser General Public License version 2.1 as ++ * published by the Free Software Foundation. ++ * ++ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. ++ */ ++ ++/* ++ * This code implements the ECC algorithm used in SmartMedia. ++ * ++ * The ECC comprises 22 bits of parity information and is stuffed into 3 bytes. ++ * The two unused bit are set to 1. ++ * The ECC can correct single bit errors in a 256-byte page of data. ++ * Thus, two such ECC blocks are used on a 512-byte NAND page. ++ * ++ */ ++ ++#ifndef __YAFFS_ECC_H__ ++#define __YAFFS_ECC_H__ ++ ++struct yaffs_ecc_other { ++ unsigned char col_parity; ++ unsigned line_parity; ++ unsigned line_parity_prime; ++}; ++ ++void yaffs_ecc_calc(const unsigned char *data, unsigned char *ecc); ++int yaffs_ecc_correct(unsigned char *data, unsigned char *read_ecc, ++ const unsigned char *test_ecc); ++ ++void yaffs_ecc_calc_other(const unsigned char *data, unsigned n_bytes, ++ struct yaffs_ecc_other *ecc); ++int yaffs_ecc_correct_other(unsigned char *data, unsigned n_bytes, ++ struct yaffs_ecc_other *read_ecc, ++ const struct yaffs_ecc_other *test_ecc); ++#endif +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_getblockinfo.h linux-3.15-rc5/fs/yaffs2/yaffs_getblockinfo.h +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_getblockinfo.h 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_getblockinfo.h 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,35 @@ ++/* ++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU Lesser General Public License version 2.1 as ++ * published by the Free Software Foundation. ++ * ++ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. ++ */ ++ ++#ifndef __YAFFS_GETBLOCKINFO_H__ ++#define __YAFFS_GETBLOCKINFO_H__ ++ ++#include "yaffs_guts.h" ++#include "yaffs_trace.h" ++ ++/* Function to manipulate block info */ ++static inline struct yaffs_block_info *yaffs_get_block_info(struct yaffs_dev ++ *dev, int blk) ++{ ++ if (blk < dev->internal_start_block || blk > dev->internal_end_block) { ++ yaffs_trace(YAFFS_TRACE_ERROR, ++ "**>> yaffs: get_block_info block %d is not valid", ++ blk); ++ BUG(); ++ } ++ return &dev->block_info[blk - dev->internal_start_block]; ++} ++ ++#endif +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_guts.c linux-3.15-rc5/fs/yaffs2/yaffs_guts.c +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_guts.c 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_guts.c 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,5146 @@ ++/* ++ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU General Public License version 2 as ++ * published by the Free Software Foundation. ++ */ ++ ++#include "yportenv.h" ++#include "yaffs_trace.h" ++ ++#include "yaffs_guts.h" ++#include "yaffs_getblockinfo.h" ++#include "yaffs_tagscompat.h" ++#include "yaffs_tagsmarshall.h" ++#include "yaffs_nand.h" ++#include "yaffs_yaffs1.h" ++#include "yaffs_yaffs2.h" ++#include "yaffs_bitmap.h" ++#include "yaffs_verify.h" ++#include "yaffs_nand.h" ++#include "yaffs_packedtags2.h" ++#include "yaffs_nameval.h" ++#include "yaffs_allocator.h" ++#include "yaffs_attribs.h" ++#include "yaffs_summary.h" ++ ++/* Note YAFFS_GC_GOOD_ENOUGH must be <= YAFFS_GC_PASSIVE_THRESHOLD */ ++#define YAFFS_GC_GOOD_ENOUGH 2 ++#define YAFFS_GC_PASSIVE_THRESHOLD 4 ++ ++#include "yaffs_ecc.h" ++ ++/* Forward declarations */ ++ ++static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk, ++ const u8 *buffer, int n_bytes, int use_reserve); ++ ++static void yaffs_fix_null_name(struct yaffs_obj *obj, YCHAR *name, ++ int buffer_size); ++ ++/* Function to calculate chunk and offset */ ++ ++void yaffs_addr_to_chunk(struct yaffs_dev *dev, loff_t addr, ++ int *chunk_out, u32 *offset_out) ++{ ++ int chunk; ++ u32 offset; ++ ++ chunk = (u32) (addr >> dev->chunk_shift); ++ ++ if (dev->chunk_div == 1) { ++ /* easy power of 2 case */ ++ offset = (u32) (addr & dev->chunk_mask); ++ } else { ++ /* Non power-of-2 case */ ++ ++ loff_t chunk_base; ++ ++ chunk /= dev->chunk_div; ++ ++ chunk_base = ((loff_t) chunk) * dev->data_bytes_per_chunk; ++ offset = (u32) (addr - chunk_base); ++ } ++ ++ *chunk_out = chunk; ++ *offset_out = offset; ++} ++ ++/* Function to return the number of shifts for a power of 2 greater than or ++ * equal to the given number ++ * Note we don't try to cater for all possible numbers and this does not have to ++ * be hellishly efficient. ++ */ ++ ++static inline u32 calc_shifts_ceiling(u32 x) ++{ ++ int extra_bits; ++ int shifts; ++ ++ shifts = extra_bits = 0; ++ ++ while (x > 1) { ++ if (x & 1) ++ extra_bits++; ++ x >>= 1; ++ shifts++; ++ } ++ ++ if (extra_bits) ++ shifts++; ++ ++ return shifts; ++} ++ ++/* Function to return the number of shifts to get a 1 in bit 0 ++ */ ++ ++static inline u32 calc_shifts(u32 x) ++{ ++ u32 shifts; ++ ++ shifts = 0; ++ ++ if (!x) ++ return 0; ++ ++ while (!(x & 1)) { ++ x >>= 1; ++ shifts++; ++ } ++ ++ return shifts; ++} ++ ++/* ++ * Temporary buffer manipulations. ++ */ ++ ++static int yaffs_init_tmp_buffers(struct yaffs_dev *dev) ++{ ++ int i; ++ u8 *buf = (u8 *) 1; ++ ++ memset(dev->temp_buffer, 0, sizeof(dev->temp_buffer)); ++ ++ for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) { ++ dev->temp_buffer[i].in_use = 0; ++ buf = kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS); ++ dev->temp_buffer[i].buffer = buf; ++ } ++ ++ return buf ? YAFFS_OK : YAFFS_FAIL; ++} ++ ++u8 *yaffs_get_temp_buffer(struct yaffs_dev * dev) ++{ ++ int i; ++ ++ dev->temp_in_use++; ++ if (dev->temp_in_use > dev->max_temp) ++ dev->max_temp = dev->temp_in_use; ++ ++ for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) { ++ if (dev->temp_buffer[i].in_use == 0) { ++ dev->temp_buffer[i].in_use = 1; ++ return dev->temp_buffer[i].buffer; ++ } ++ } ++ ++ yaffs_trace(YAFFS_TRACE_BUFFERS, "Out of temp buffers"); ++ /* ++ * If we got here then we have to allocate an unmanaged one ++ * This is not good. ++ */ ++ ++ dev->unmanaged_buffer_allocs++; ++ return kmalloc(dev->data_bytes_per_chunk, GFP_NOFS); ++ ++} ++ ++void yaffs_release_temp_buffer(struct yaffs_dev *dev, u8 *buffer) ++{ ++ int i; ++ ++ dev->temp_in_use--; ++ ++ for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) { ++ if (dev->temp_buffer[i].buffer == buffer) { ++ dev->temp_buffer[i].in_use = 0; ++ return; ++ } ++ } ++ ++ if (buffer) { ++ /* assume it is an unmanaged one. */ ++ yaffs_trace(YAFFS_TRACE_BUFFERS, ++ "Releasing unmanaged temp buffer"); ++ kfree(buffer); ++ dev->unmanaged_buffer_deallocs++; ++ } ++ ++} ++ ++/* ++ * Functions for robustisizing TODO ++ * ++ */ ++ ++static void yaffs_handle_chunk_wr_ok(struct yaffs_dev *dev, int nand_chunk, ++ const u8 *data, ++ const struct yaffs_ext_tags *tags) ++{ ++ (void) dev; ++ (void) nand_chunk; ++ (void) data; ++ (void) tags; ++} ++ ++static void yaffs_handle_chunk_update(struct yaffs_dev *dev, int nand_chunk, ++ const struct yaffs_ext_tags *tags) ++{ ++ (void) dev; ++ (void) nand_chunk; ++ (void) tags; ++} ++ ++void yaffs_handle_chunk_error(struct yaffs_dev *dev, ++ struct yaffs_block_info *bi) ++{ ++ if (!bi->gc_prioritise) { ++ bi->gc_prioritise = 1; ++ dev->has_pending_prioritised_gc = 1; ++ bi->chunk_error_strikes++; ++ ++ if (bi->chunk_error_strikes > 3) { ++ bi->needs_retiring = 1; /* Too many stikes, so retire */ ++ yaffs_trace(YAFFS_TRACE_ALWAYS, ++ "yaffs: Block struck out"); ++ ++ } ++ } ++} ++ ++static void yaffs_handle_chunk_wr_error(struct yaffs_dev *dev, int nand_chunk, ++ int erased_ok) ++{ ++ int flash_block = nand_chunk / dev->param.chunks_per_block; ++ struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block); ++ ++ yaffs_handle_chunk_error(dev, bi); ++ ++ if (erased_ok) { ++ /* Was an actual write failure, ++ * so mark the block for retirement.*/ ++ bi->needs_retiring = 1; ++ yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS, ++ "**>> Block %d needs retiring", flash_block); ++ } ++ ++ /* Delete the chunk */ ++ yaffs_chunk_del(dev, nand_chunk, 1, __LINE__); ++ yaffs_skip_rest_of_block(dev); ++} ++ ++/* ++ * Verification code ++ */ ++ ++/* ++ * Simple hash function. Needs to have a reasonable spread ++ */ ++ ++static inline int yaffs_hash_fn(int n) ++{ ++ if (n < 0) ++ n = -n; ++ return n % YAFFS_NOBJECT_BUCKETS; ++} ++ ++/* ++ * Access functions to useful fake objects. ++ * Note that root might have a presence in NAND if permissions are set. ++ */ ++ ++struct yaffs_obj *yaffs_root(struct yaffs_dev *dev) ++{ ++ return dev->root_dir; ++} ++ ++struct yaffs_obj *yaffs_lost_n_found(struct yaffs_dev *dev) ++{ ++ return dev->lost_n_found; ++} ++ ++/* ++ * Erased NAND checking functions ++ */ ++ ++int yaffs_check_ff(u8 *buffer, int n_bytes) ++{ ++ /* Horrible, slow implementation */ ++ while (n_bytes--) { ++ if (*buffer != 0xff) ++ return 0; ++ buffer++; ++ } ++ return 1; ++} ++ ++static int yaffs_check_chunk_erased(struct yaffs_dev *dev, int nand_chunk) ++{ ++ int retval = YAFFS_OK; ++ u8 *data = yaffs_get_temp_buffer(dev); ++ struct yaffs_ext_tags tags; ++ int result; ++ ++ result = yaffs_rd_chunk_tags_nand(dev, nand_chunk, data, &tags); ++ ++ if (tags.ecc_result > YAFFS_ECC_RESULT_NO_ERROR) ++ retval = YAFFS_FAIL; ++ ++ if (!yaffs_check_ff(data, dev->data_bytes_per_chunk) || ++ tags.chunk_used) { ++ yaffs_trace(YAFFS_TRACE_NANDACCESS, ++ "Chunk %d not erased", nand_chunk); ++ retval = YAFFS_FAIL; ++ } ++ ++ yaffs_release_temp_buffer(dev, data); ++ ++ return retval; ++ ++} ++ ++static int yaffs_verify_chunk_written(struct yaffs_dev *dev, ++ int nand_chunk, ++ const u8 *data, ++ struct yaffs_ext_tags *tags) ++{ ++ int retval = YAFFS_OK; ++ struct yaffs_ext_tags temp_tags; ++ u8 *buffer = yaffs_get_temp_buffer(dev); ++ int result; ++ ++ result = yaffs_rd_chunk_tags_nand(dev, nand_chunk, buffer, &temp_tags); ++ if (memcmp(buffer, data, dev->data_bytes_per_chunk) || ++ temp_tags.obj_id != tags->obj_id || ++ temp_tags.chunk_id != tags->chunk_id || ++ temp_tags.n_bytes != tags->n_bytes) ++ retval = YAFFS_FAIL; ++ ++ yaffs_release_temp_buffer(dev, buffer); ++ ++ return retval; ++} ++ ++ ++int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks) ++{ ++ int reserved_chunks; ++ int reserved_blocks = dev->param.n_reserved_blocks; ++ int checkpt_blocks; ++ ++ checkpt_blocks = yaffs_calc_checkpt_blocks_required(dev); ++ ++ reserved_chunks = ++ (reserved_blocks + checkpt_blocks) * dev->param.chunks_per_block; ++ ++ return (dev->n_free_chunks > (reserved_chunks + n_chunks)); ++} ++ ++static int yaffs_find_alloc_block(struct yaffs_dev *dev) ++{ ++ int i; ++ struct yaffs_block_info *bi; ++ ++ if (dev->n_erased_blocks < 1) { ++ /* Hoosterman we've got a problem. ++ * Can't get space to gc ++ */ ++ yaffs_trace(YAFFS_TRACE_ERROR, ++ "yaffs tragedy: no more erased blocks"); ++ ++ return -1; ++ } ++ ++ /* Find an empty block. */ ++ ++ for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) { ++ dev->alloc_block_finder++; ++ if (dev->alloc_block_finder < dev->internal_start_block ++ || dev->alloc_block_finder > dev->internal_end_block) { ++ dev->alloc_block_finder = dev->internal_start_block; ++ } ++ ++ bi = yaffs_get_block_info(dev, dev->alloc_block_finder); ++ ++ if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) { ++ bi->block_state = YAFFS_BLOCK_STATE_ALLOCATING; ++ dev->seq_number++; ++ bi->seq_number = dev->seq_number; ++ dev->n_erased_blocks--; ++ yaffs_trace(YAFFS_TRACE_ALLOCATE, ++ "Allocated block %d, seq %d, %d left" , ++ dev->alloc_block_finder, dev->seq_number, ++ dev->n_erased_blocks); ++ return dev->alloc_block_finder; ++ } ++ } ++ ++ yaffs_trace(YAFFS_TRACE_ALWAYS, ++ "yaffs tragedy: no more erased blocks, but there should have been %d", ++ dev->n_erased_blocks); ++ ++ return -1; ++} ++ ++static int yaffs_alloc_chunk(struct yaffs_dev *dev, int use_reserver, ++ struct yaffs_block_info **block_ptr) ++{ ++ int ret_val; ++ struct yaffs_block_info *bi; ++ ++ if (dev->alloc_block < 0) { ++ /* Get next block to allocate off */ ++ dev->alloc_block = yaffs_find_alloc_block(dev); ++ dev->alloc_page = 0; ++ } ++ ++ if (!use_reserver && !yaffs_check_alloc_available(dev, 1)) { ++ /* No space unless we're allowed to use the reserve. */ ++ return -1; ++ } ++ ++ if (dev->n_erased_blocks < dev->param.n_reserved_blocks ++ && dev->alloc_page == 0) ++ yaffs_trace(YAFFS_TRACE_ALLOCATE, "Allocating reserve"); ++ ++ /* Next page please.... */ ++ if (dev->alloc_block >= 0) { ++ bi = yaffs_get_block_info(dev, dev->alloc_block); ++ ++ ret_val = (dev->alloc_block * dev->param.chunks_per_block) + ++ dev->alloc_page; ++ bi->pages_in_use++; ++ yaffs_set_chunk_bit(dev, dev->alloc_block, dev->alloc_page); ++ ++ dev->alloc_page++; ++ ++ dev->n_free_chunks--; ++ ++ /* If the block is full set the state to full */ ++ if (dev->alloc_page >= dev->param.chunks_per_block) { ++ bi->block_state = YAFFS_BLOCK_STATE_FULL; ++ dev->alloc_block = -1; ++ } ++ ++ if (block_ptr) ++ *block_ptr = bi; ++ ++ return ret_val; ++ } ++ ++ yaffs_trace(YAFFS_TRACE_ERROR, ++ "!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!"); ++ ++ return -1; ++} ++ ++static int yaffs_get_erased_chunks(struct yaffs_dev *dev) ++{ ++ int n; ++ ++ n = dev->n_erased_blocks * dev->param.chunks_per_block; ++ ++ if (dev->alloc_block > 0) ++ n += (dev->param.chunks_per_block - dev->alloc_page); ++ ++ return n; ++ ++} ++ ++/* ++ * yaffs_skip_rest_of_block() skips over the rest of the allocation block ++ * if we don't want to write to it. ++ */ ++void yaffs_skip_rest_of_block(struct yaffs_dev *dev) ++{ ++ struct yaffs_block_info *bi; ++ ++ if (dev->alloc_block > 0) { ++ bi = yaffs_get_block_info(dev, dev->alloc_block); ++ if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING) { ++ bi->block_state = YAFFS_BLOCK_STATE_FULL; ++ dev->alloc_block = -1; ++ } ++ } ++} ++ ++static int yaffs_write_new_chunk(struct yaffs_dev *dev, ++ const u8 *data, ++ struct yaffs_ext_tags *tags, int use_reserver) ++{ ++ int attempts = 0; ++ int write_ok = 0; ++ int chunk; ++ ++ yaffs2_checkpt_invalidate(dev); ++ ++ do { ++ struct yaffs_block_info *bi = 0; ++ int erased_ok = 0; ++ ++ chunk = yaffs_alloc_chunk(dev, use_reserver, &bi); ++ if (chunk < 0) { ++ /* no space */ ++ break; ++ } ++ ++ /* First check this chunk is erased, if it needs ++ * checking. The checking policy (unless forced ++ * always on) is as follows: ++ * ++ * Check the first page we try to write in a block. ++ * If the check passes then we don't need to check any ++ * more. If the check fails, we check again... ++ * If the block has been erased, we don't need to check. ++ * ++ * However, if the block has been prioritised for gc, ++ * then we think there might be something odd about ++ * this block and stop using it. ++ * ++ * Rationale: We should only ever see chunks that have ++ * not been erased if there was a partially written ++ * chunk due to power loss. This checking policy should ++ * catch that case with very few checks and thus save a ++ * lot of checks that are most likely not needed. ++ * ++ * Mods to the above ++ * If an erase check fails or the write fails we skip the ++ * rest of the block. ++ */ ++ ++ /* let's give it a try */ ++ attempts++; ++ ++ if (dev->param.always_check_erased) ++ bi->skip_erased_check = 0; ++ ++ if (!bi->skip_erased_check) { ++ erased_ok = yaffs_check_chunk_erased(dev, chunk); ++ if (erased_ok != YAFFS_OK) { ++ yaffs_trace(YAFFS_TRACE_ERROR, ++ "**>> yaffs chunk %d was not erased", ++ chunk); ++ ++ /* If not erased, delete this one, ++ * skip rest of block and ++ * try another chunk */ ++ yaffs_chunk_del(dev, chunk, 1, __LINE__); ++ yaffs_skip_rest_of_block(dev); ++ continue; ++ } ++ } ++ ++ write_ok = yaffs_wr_chunk_tags_nand(dev, chunk, data, tags); ++ ++ if (!bi->skip_erased_check) ++ write_ok = ++ yaffs_verify_chunk_written(dev, chunk, data, tags); ++ ++ if (write_ok != YAFFS_OK) { ++ /* Clean up aborted write, skip to next block and ++ * try another chunk */ ++ yaffs_handle_chunk_wr_error(dev, chunk, erased_ok); ++ continue; ++ } ++ ++ bi->skip_erased_check = 1; ++ ++ /* Copy the data into the robustification buffer */ ++ yaffs_handle_chunk_wr_ok(dev, chunk, data, tags); ++ ++ } while (write_ok != YAFFS_OK && ++ (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts)); ++ ++ if (!write_ok) ++ chunk = -1; ++ ++ if (attempts > 1) { ++ yaffs_trace(YAFFS_TRACE_ERROR, ++ "**>> yaffs write required %d attempts", ++ attempts); ++ dev->n_retried_writes += (attempts - 1); ++ } ++ ++ return chunk; ++} ++ ++/* ++ * Block retiring for handling a broken block. ++ */ ++ ++static void yaffs_retire_block(struct yaffs_dev *dev, int flash_block) ++{ ++ struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block); ++ ++ yaffs2_checkpt_invalidate(dev); ++ ++ yaffs2_clear_oldest_dirty_seq(dev, bi); ++ ++ if (yaffs_mark_bad(dev, flash_block) != YAFFS_OK) { ++ if (yaffs_erase_block(dev, flash_block) != YAFFS_OK) { ++ yaffs_trace(YAFFS_TRACE_ALWAYS, ++ "yaffs: Failed to mark bad and erase block %d", ++ flash_block); ++ } else { ++ struct yaffs_ext_tags tags; ++ int chunk_id = ++ flash_block * dev->param.chunks_per_block; ++ ++ u8 *buffer = yaffs_get_temp_buffer(dev); ++ ++ memset(buffer, 0xff, dev->data_bytes_per_chunk); ++ memset(&tags, 0, sizeof(tags)); ++ tags.seq_number = YAFFS_SEQUENCE_BAD_BLOCK; ++ if (dev->tagger.write_chunk_tags_fn(dev, chunk_id - ++ dev->chunk_offset, ++ buffer, ++ &tags) != YAFFS_OK) ++ yaffs_trace(YAFFS_TRACE_ALWAYS, ++ "yaffs: Failed to write bad block marker to block %d", ++ flash_block); ++ ++ yaffs_release_temp_buffer(dev, buffer); ++ } ++ } ++ ++ bi->block_state = YAFFS_BLOCK_STATE_DEAD; ++ bi->gc_prioritise = 0; ++ bi->needs_retiring = 0; ++ ++ dev->n_retired_blocks++; ++} ++ ++/*---------------- Name handling functions ------------*/ ++ ++static u16 yaffs_calc_name_sum(const YCHAR *name) ++{ ++ u16 sum = 0; ++ u16 i = 1; ++ ++ if (!name) ++ return 0; ++ ++ while ((*name) && i < (YAFFS_MAX_NAME_LENGTH / 2)) { ++ ++ /* 0x1f mask is case insensitive */ ++ sum += ((*name) & 0x1f) * i; ++ i++; ++ name++; ++ } ++ return sum; ++} ++ ++ ++void yaffs_set_obj_name(struct yaffs_obj *obj, const YCHAR * name) ++{ ++ memset(obj->short_name, 0, sizeof(obj->short_name)); ++ ++ if (name && !name[0]) { ++ yaffs_fix_null_name(obj, obj->short_name, ++ YAFFS_SHORT_NAME_LENGTH); ++ name = obj->short_name; ++ } else if (name && ++ strnlen(name, YAFFS_SHORT_NAME_LENGTH + 1) <= ++ YAFFS_SHORT_NAME_LENGTH) { ++ strcpy(obj->short_name, name); ++ } ++ ++ obj->sum = yaffs_calc_name_sum(name); ++} ++ ++void yaffs_set_obj_name_from_oh(struct yaffs_obj *obj, ++ const struct yaffs_obj_hdr *oh) ++{ ++#ifdef CONFIG_YAFFS_AUTO_UNICODE ++ YCHAR tmp_name[YAFFS_MAX_NAME_LENGTH + 1]; ++ memset(tmp_name, 0, sizeof(tmp_name)); ++ yaffs_load_name_from_oh(obj->my_dev, tmp_name, oh->name, ++ YAFFS_MAX_NAME_LENGTH + 1); ++ yaffs_set_obj_name(obj, tmp_name); ++#else ++ yaffs_set_obj_name(obj, oh->name); ++#endif ++} ++ ++loff_t yaffs_max_file_size(struct yaffs_dev *dev) ++{ ++ if(sizeof(loff_t) < 8) ++ return YAFFS_MAX_FILE_SIZE_32; ++ else ++ return ((loff_t) YAFFS_MAX_CHUNK_ID) * dev->data_bytes_per_chunk; ++} ++ ++/*-------------------- TNODES ------------------- ++ ++ * List of spare tnodes ++ * The list is hooked together using the first pointer ++ * in the tnode. ++ */ ++ ++struct yaffs_tnode *yaffs_get_tnode(struct yaffs_dev *dev) ++{ ++ struct yaffs_tnode *tn = yaffs_alloc_raw_tnode(dev); ++ ++ if (tn) { ++ memset(tn, 0, dev->tnode_size); ++ dev->n_tnodes++; ++ } ++ ++ dev->checkpoint_blocks_required = 0; /* force recalculation */ ++ ++ return tn; ++} ++ ++/* FreeTnode frees up a tnode and puts it back on the free list */ ++static void yaffs_free_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn) ++{ ++ yaffs_free_raw_tnode(dev, tn); ++ dev->n_tnodes--; ++ dev->checkpoint_blocks_required = 0; /* force recalculation */ ++} ++ ++static void yaffs_deinit_tnodes_and_objs(struct yaffs_dev *dev) ++{ ++ yaffs_deinit_raw_tnodes_and_objs(dev); ++ dev->n_obj = 0; ++ dev->n_tnodes = 0; ++} ++ ++static void yaffs_load_tnode_0(struct yaffs_dev *dev, struct yaffs_tnode *tn, ++ unsigned pos, unsigned val) ++{ ++ u32 *map = (u32 *) tn; ++ u32 bit_in_map; ++ u32 bit_in_word; ++ u32 word_in_map; ++ u32 mask; ++ ++ pos &= YAFFS_TNODES_LEVEL0_MASK; ++ val >>= dev->chunk_grp_bits; ++ ++ bit_in_map = pos * dev->tnode_width; ++ word_in_map = bit_in_map / 32; ++ bit_in_word = bit_in_map & (32 - 1); ++ ++ mask = dev->tnode_mask << bit_in_word; ++ ++ map[word_in_map] &= ~mask; ++ map[word_in_map] |= (mask & (val << bit_in_word)); ++ ++ if (dev->tnode_width > (32 - bit_in_word)) { ++ bit_in_word = (32 - bit_in_word); ++ word_in_map++; ++ mask = ++ dev->tnode_mask >> bit_in_word; ++ map[word_in_map] &= ~mask; ++ map[word_in_map] |= (mask & (val >> bit_in_word)); ++ } ++} ++ ++u32 yaffs_get_group_base(struct yaffs_dev *dev, struct yaffs_tnode *tn, ++ unsigned pos) ++{ ++ u32 *map = (u32 *) tn; ++ u32 bit_in_map; ++ u32 bit_in_word; ++ u32 word_in_map; ++ u32 val; ++ ++ pos &= YAFFS_TNODES_LEVEL0_MASK; ++ ++ bit_in_map = pos * dev->tnode_width; ++ word_in_map = bit_in_map / 32; ++ bit_in_word = bit_in_map & (32 - 1); ++ ++ val = map[word_in_map] >> bit_in_word; ++ ++ if (dev->tnode_width > (32 - bit_in_word)) { ++ bit_in_word = (32 - bit_in_word); ++ word_in_map++; ++ val |= (map[word_in_map] << bit_in_word); ++ } ++ ++ val &= dev->tnode_mask; ++ val <<= dev->chunk_grp_bits; ++ ++ return val; ++} ++ ++/* ------------------- End of individual tnode manipulation -----------------*/ ++ ++/* ---------Functions to manipulate the look-up tree (made up of tnodes) ------ ++ * The look up tree is represented by the top tnode and the number of top_level ++ * in the tree. 0 means only the level 0 tnode is in the tree. ++ */ ++ ++/* FindLevel0Tnode finds the level 0 tnode, if one exists. */ ++struct yaffs_tnode *yaffs_find_tnode_0(struct yaffs_dev *dev, ++ struct yaffs_file_var *file_struct, ++ u32 chunk_id) ++{ ++ struct yaffs_tnode *tn = file_struct->top; ++ u32 i; ++ int required_depth; ++ int level = file_struct->top_level; ++ ++ (void) dev; ++ ++ /* Check sane level and chunk Id */ ++ if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL) ++ return NULL; ++ ++ if (chunk_id > YAFFS_MAX_CHUNK_ID) ++ return NULL; ++ ++ /* First check we're tall enough (ie enough top_level) */ ++ ++ i = chunk_id >> YAFFS_TNODES_LEVEL0_BITS; ++ required_depth = 0; ++ while (i) { ++ i >>= YAFFS_TNODES_INTERNAL_BITS; ++ required_depth++; ++ } ++ ++ if (required_depth > file_struct->top_level) ++ return NULL; /* Not tall enough, so we can't find it */ ++ ++ /* Traverse down to level 0 */ ++ while (level > 0 && tn) { ++ tn = tn->internal[(chunk_id >> ++ (YAFFS_TNODES_LEVEL0_BITS + ++ (level - 1) * ++ YAFFS_TNODES_INTERNAL_BITS)) & ++ YAFFS_TNODES_INTERNAL_MASK]; ++ level--; ++ } ++ ++ return tn; ++} ++ ++/* add_find_tnode_0 finds the level 0 tnode if it exists, ++ * otherwise first expands the tree. ++ * This happens in two steps: ++ * 1. If the tree isn't tall enough, then make it taller. ++ * 2. Scan down the tree towards the level 0 tnode adding tnodes if required. ++ * ++ * Used when modifying the tree. ++ * ++ * If the tn argument is NULL, then a fresh tnode will be added otherwise the ++ * specified tn will be plugged into the ttree. ++ */ ++ ++struct yaffs_tnode *yaffs_add_find_tnode_0(struct yaffs_dev *dev, ++ struct yaffs_file_var *file_struct, ++ u32 chunk_id, ++ struct yaffs_tnode *passed_tn) ++{ ++ int required_depth; ++ int i; ++ int l; ++ struct yaffs_tnode *tn; ++ u32 x; ++ ++ /* Check sane level and page Id */ ++ if (file_struct->top_level < 0 || ++ file_struct->top_level > YAFFS_TNODES_MAX_LEVEL) ++ return NULL; ++ ++ if (chunk_id > YAFFS_MAX_CHUNK_ID) ++ return NULL; ++ ++ /* First check we're tall enough (ie enough top_level) */ ++ ++ x = chunk_id >> YAFFS_TNODES_LEVEL0_BITS; ++ required_depth = 0; ++ while (x) { ++ x >>= YAFFS_TNODES_INTERNAL_BITS; ++ required_depth++; ++ } ++ ++ if (required_depth > file_struct->top_level) { ++ /* Not tall enough, gotta make the tree taller */ ++ for (i = file_struct->top_level; i < required_depth; i++) { ++ ++ tn = yaffs_get_tnode(dev); ++ ++ if (tn) { ++ tn->internal[0] = file_struct->top; ++ file_struct->top = tn; ++ file_struct->top_level++; ++ } else { ++ yaffs_trace(YAFFS_TRACE_ERROR, ++ "yaffs: no more tnodes"); ++ return NULL; ++ } ++ } ++ } ++ ++ /* Traverse down to level 0, adding anything we need */ ++ ++ l = file_struct->top_level; ++ tn = file_struct->top; ++ ++ if (l > 0) { ++ while (l > 0 && tn) { ++ x = (chunk_id >> ++ (YAFFS_TNODES_LEVEL0_BITS + ++ (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) & ++ YAFFS_TNODES_INTERNAL_MASK; ++ ++ if ((l > 1) && !tn->internal[x]) { ++ /* Add missing non-level-zero tnode */ ++ tn->internal[x] = yaffs_get_tnode(dev); ++ if (!tn->internal[x]) ++ return NULL; ++ } else if (l == 1) { ++ /* Looking from level 1 at level 0 */ ++ if (passed_tn) { ++ /* If we already have one, release it */ ++ if (tn->internal[x]) ++ yaffs_free_tnode(dev, ++ tn->internal[x]); ++ tn->internal[x] = passed_tn; ++ ++ } else if (!tn->internal[x]) { ++ /* Don't have one, none passed in */ ++ tn->internal[x] = yaffs_get_tnode(dev); ++ if (!tn->internal[x]) ++ return NULL; ++ } ++ } ++ ++ tn = tn->internal[x]; ++ l--; ++ } ++ } else { ++ /* top is level 0 */ ++ if (passed_tn) { ++ memcpy(tn, passed_tn, ++ (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8); ++ yaffs_free_tnode(dev, passed_tn); ++ } ++ } ++ ++ return tn; ++} ++ ++static int yaffs_tags_match(const struct yaffs_ext_tags *tags, int obj_id, ++ int chunk_obj) ++{ ++ return (tags->chunk_id == chunk_obj && ++ tags->obj_id == obj_id && ++ !tags->is_deleted) ? 1 : 0; ++ ++} ++ ++static int yaffs_find_chunk_in_group(struct yaffs_dev *dev, int the_chunk, ++ struct yaffs_ext_tags *tags, int obj_id, ++ int inode_chunk) ++{ ++ int j; ++ ++ for (j = 0; the_chunk && j < dev->chunk_grp_size; j++) { ++ if (yaffs_check_chunk_bit ++ (dev, the_chunk / dev->param.chunks_per_block, ++ the_chunk % dev->param.chunks_per_block)) { ++ ++ if (dev->chunk_grp_size == 1) ++ return the_chunk; ++ else { ++ yaffs_rd_chunk_tags_nand(dev, the_chunk, NULL, ++ tags); ++ if (yaffs_tags_match(tags, ++ obj_id, inode_chunk)) { ++ /* found it; */ ++ return the_chunk; ++ } ++ } ++ } ++ the_chunk++; ++ } ++ return -1; ++} ++ ++int yaffs_find_chunk_in_file(struct yaffs_obj *in, int inode_chunk, ++ struct yaffs_ext_tags *tags) ++{ ++ /*Get the Tnode, then get the level 0 offset chunk offset */ ++ struct yaffs_tnode *tn; ++ int the_chunk = -1; ++ struct yaffs_ext_tags local_tags; ++ int ret_val = -1; ++ struct yaffs_dev *dev = in->my_dev; ++ ++ if (!tags) { ++ /* Passed a NULL, so use our own tags space */ ++ tags = &local_tags; ++ } ++ ++ tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk); ++ ++ if (!tn) ++ return ret_val; ++ ++ the_chunk = yaffs_get_group_base(dev, tn, inode_chunk); ++ ++ ret_val = yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id, ++ inode_chunk); ++ return ret_val; ++} ++ ++static int yaffs_find_del_file_chunk(struct yaffs_obj *in, int inode_chunk, ++ struct yaffs_ext_tags *tags) ++{ ++ /* Get the Tnode, then get the level 0 offset chunk offset */ ++ struct yaffs_tnode *tn; ++ int the_chunk = -1; ++ struct yaffs_ext_tags local_tags; ++ struct yaffs_dev *dev = in->my_dev; ++ int ret_val = -1; ++ ++ if (!tags) { ++ /* Passed a NULL, so use our own tags space */ ++ tags = &local_tags; ++ } ++ ++ tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk); ++ ++ if (!tn) ++ return ret_val; ++ ++ the_chunk = yaffs_get_group_base(dev, tn, inode_chunk); ++ ++ ret_val = yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id, ++ inode_chunk); ++ ++ /* Delete the entry in the filestructure (if found) */ ++ if (ret_val != -1) ++ yaffs_load_tnode_0(dev, tn, inode_chunk, 0); ++ ++ return ret_val; ++} ++ ++int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk, ++ int nand_chunk, int in_scan) ++{ ++ /* NB in_scan is zero unless scanning. ++ * For forward scanning, in_scan is > 0; ++ * for backward scanning in_scan is < 0 ++ * ++ * nand_chunk = 0 is a dummy insert to make sure the tnodes are there. ++ */ ++ ++ struct yaffs_tnode *tn; ++ struct yaffs_dev *dev = in->my_dev; ++ int existing_cunk; ++ struct yaffs_ext_tags existing_tags; ++ struct yaffs_ext_tags new_tags; ++ unsigned existing_serial, new_serial; ++ ++ if (in->variant_type != YAFFS_OBJECT_TYPE_FILE) { ++ /* Just ignore an attempt at putting a chunk into a non-file ++ * during scanning. ++ * If it is not during Scanning then something went wrong! ++ */ ++ if (!in_scan) { ++ yaffs_trace(YAFFS_TRACE_ERROR, ++ "yaffs tragedy:attempt to put data chunk into a non-file" ++ ); ++ BUG(); ++ } ++ ++ yaffs_chunk_del(dev, nand_chunk, 1, __LINE__); ++ return YAFFS_OK; ++ } ++ ++ tn = yaffs_add_find_tnode_0(dev, ++ &in->variant.file_variant, ++ inode_chunk, NULL); ++ if (!tn) ++ return YAFFS_FAIL; ++ ++ if (!nand_chunk) ++ /* Dummy insert, bail now */ ++ return YAFFS_OK; ++ ++ existing_cunk = yaffs_get_group_base(dev, tn, inode_chunk); ++ ++ if (in_scan != 0) { ++ /* If we're scanning then we need to test for duplicates ++ * NB This does not need to be efficient since it should only ++ * happen when the power fails during a write, then only one ++ * chunk should ever be affected. ++ * ++ * Correction for YAFFS2: This could happen quite a lot and we ++ * need to think about efficiency! TODO ++ * Update: For backward scanning we don't need to re-read tags ++ * so this is quite cheap. ++ */ ++ ++ if (existing_cunk > 0) { ++ /* NB Right now existing chunk will not be real ++ * chunk_id if the chunk group size > 1 ++ * thus we have to do a FindChunkInFile to get the ++ * real chunk id. ++ * ++ * We have a duplicate now we need to decide which ++ * one to use: ++ * ++ * Backwards scanning YAFFS2: The old one is what ++ * we use, dump the new one. ++ * YAFFS1: Get both sets of tags and compare serial ++ * numbers. ++ */ ++ ++ if (in_scan > 0) { ++ /* Only do this for forward scanning */ ++ yaffs_rd_chunk_tags_nand(dev, ++ nand_chunk, ++ NULL, &new_tags); ++ ++ /* Do a proper find */ ++ existing_cunk = ++ yaffs_find_chunk_in_file(in, inode_chunk, ++ &existing_tags); ++ } ++ ++ if (existing_cunk <= 0) { ++ /*Hoosterman - how did this happen? */ ++ ++ yaffs_trace(YAFFS_TRACE_ERROR, ++ "yaffs tragedy: existing chunk < 0 in scan" ++ ); ++ ++ } ++ ++ /* NB The deleted flags should be false, otherwise ++ * the chunks will not be loaded during a scan ++ */ ++ ++ if (in_scan > 0) { ++ new_serial = new_tags.serial_number; ++ existing_serial = existing_tags.serial_number; ++ } ++ ++ if ((in_scan > 0) && ++ (existing_cunk <= 0 || ++ ((existing_serial + 1) & 3) == new_serial)) { ++ /* Forward scanning. ++ * Use new ++ * Delete the old one and drop through to ++ * update the tnode ++ */ ++ yaffs_chunk_del(dev, existing_cunk, 1, ++ __LINE__); ++ } else { ++ /* Backward scanning or we want to use the ++ * existing one ++ * Delete the new one and return early so that ++ * the tnode isn't changed ++ */ ++ yaffs_chunk_del(dev, nand_chunk, 1, __LINE__); ++ return YAFFS_OK; ++ } ++ } ++ ++ } ++ ++ if (existing_cunk == 0) ++ in->n_data_chunks++; ++ ++ yaffs_load_tnode_0(dev, tn, inode_chunk, nand_chunk); ++ ++ return YAFFS_OK; ++} ++ ++static void yaffs_soft_del_chunk(struct yaffs_dev *dev, int chunk) ++{ ++ struct yaffs_block_info *the_block; ++ unsigned block_no; ++ ++ yaffs_trace(YAFFS_TRACE_DELETION, "soft delete chunk %d", chunk); ++ ++ block_no = chunk / dev->param.chunks_per_block; ++ the_block = yaffs_get_block_info(dev, block_no); ++ if (the_block) { ++ the_block->soft_del_pages++; ++ dev->n_free_chunks++; ++ yaffs2_update_oldest_dirty_seq(dev, block_no, the_block); ++ } ++} ++ ++/* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all ++ * the chunks in the file. ++ * All soft deleting does is increment the block's softdelete count and pulls ++ * the chunk out of the tnode. ++ * Thus, essentially this is the same as DeleteWorker except that the chunks ++ * are soft deleted. ++ */ ++ ++static int yaffs_soft_del_worker(struct yaffs_obj *in, struct yaffs_tnode *tn, ++ u32 level, int chunk_offset) ++{ ++ int i; ++ int the_chunk; ++ int all_done = 1; ++ struct yaffs_dev *dev = in->my_dev; ++ ++ if (!tn) ++ return 1; ++ ++ if (level > 0) { ++ for (i = YAFFS_NTNODES_INTERNAL - 1; ++ all_done && i >= 0; ++ i--) { ++ if (tn->internal[i]) { ++ all_done = ++ yaffs_soft_del_worker(in, ++ tn->internal[i], ++ level - 1, ++ (chunk_offset << ++ YAFFS_TNODES_INTERNAL_BITS) ++ + i); ++ if (all_done) { ++ yaffs_free_tnode(dev, ++ tn->internal[i]); ++ tn->internal[i] = NULL; ++ } else { ++ /* Can this happen? */ ++ } ++ } ++ } ++ return (all_done) ? 1 : 0; ++ } ++ ++ /* level 0 */ ++ for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) { ++ the_chunk = yaffs_get_group_base(dev, tn, i); ++ if (the_chunk) { ++ yaffs_soft_del_chunk(dev, the_chunk); ++ yaffs_load_tnode_0(dev, tn, i, 0); ++ } ++ } ++ return 1; ++} ++ ++static void yaffs_remove_obj_from_dir(struct yaffs_obj *obj) ++{ ++ struct yaffs_dev *dev = obj->my_dev; ++ struct yaffs_obj *parent; ++ ++ yaffs_verify_obj_in_dir(obj); ++ parent = obj->parent; ++ ++ yaffs_verify_dir(parent); ++ ++ if (dev && dev->param.remove_obj_fn) ++ dev->param.remove_obj_fn(obj); ++ ++ list_del_init(&obj->siblings); ++ obj->parent = NULL; ++ ++ yaffs_verify_dir(parent); ++} ++ ++void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj) ++{ ++ if (!directory) { ++ yaffs_trace(YAFFS_TRACE_ALWAYS, ++ "tragedy: Trying to add an object to a null pointer directory" ++ ); ++ BUG(); ++ return; ++ } ++ if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) { ++ yaffs_trace(YAFFS_TRACE_ALWAYS, ++ "tragedy: Trying to add an object to a non-directory" ++ ); ++ BUG(); ++ } ++ ++ if (obj->siblings.prev == NULL) { ++ /* Not initialised */ ++ BUG(); ++ } ++ ++ yaffs_verify_dir(directory); ++ ++ yaffs_remove_obj_from_dir(obj); ++ ++ /* Now add it */ ++ list_add(&obj->siblings, &directory->variant.dir_variant.children); ++ obj->parent = directory; ++ ++ if (directory == obj->my_dev->unlinked_dir ++ || directory == obj->my_dev->del_dir) { ++ obj->unlinked = 1; ++ obj->my_dev->n_unlinked_files++; ++ obj->rename_allowed = 0; ++ } ++ ++ yaffs_verify_dir(directory); ++ yaffs_verify_obj_in_dir(obj); ++} ++ ++static int yaffs_change_obj_name(struct yaffs_obj *obj, ++ struct yaffs_obj *new_dir, ++ const YCHAR *new_name, int force, int shadows) ++{ ++ int unlink_op; ++ int del_op; ++ struct yaffs_obj *existing_target; ++ ++ if (new_dir == NULL) ++ new_dir = obj->parent; /* use the old directory */ ++ ++ if (new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) { ++ yaffs_trace(YAFFS_TRACE_ALWAYS, ++ "tragedy: yaffs_change_obj_name: new_dir is not a directory" ++ ); ++ BUG(); ++ } ++ ++ unlink_op = (new_dir == obj->my_dev->unlinked_dir); ++ del_op = (new_dir == obj->my_dev->del_dir); ++ ++ existing_target = yaffs_find_by_name(new_dir, new_name); ++ ++ /* If the object is a file going into the unlinked directory, ++ * then it is OK to just stuff it in since duplicate names are OK. ++ * else only proceed if the new name does not exist and we're putting ++ * it into a directory. ++ */ ++ if (!(unlink_op || del_op || force || ++ shadows > 0 || !existing_target) || ++ new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) ++ return YAFFS_FAIL; ++ ++ yaffs_set_obj_name(obj, new_name); ++ obj->dirty = 1; ++ yaffs_add_obj_to_dir(new_dir, obj); ++ ++ if (unlink_op) ++ obj->unlinked = 1; ++ ++ /* If it is a deletion then we mark it as a shrink for gc */ ++ if (yaffs_update_oh(obj, new_name, 0, del_op, shadows, NULL) >= 0) ++ return YAFFS_OK; ++ ++ return YAFFS_FAIL; ++} ++ ++/*------------------------ Short Operations Cache ------------------------------ ++ * In many situations where there is no high level buffering a lot of ++ * reads might be short sequential reads, and a lot of writes may be short ++ * sequential writes. eg. scanning/writing a jpeg file. ++ * In these cases, a short read/write cache can provide a huge perfomance ++ * benefit with dumb-as-a-rock code. ++ * In Linux, the page cache provides read buffering and the short op cache ++ * provides write buffering. ++ * ++ * There are a small number (~10) of cache chunks per device so that we don't ++ * need a very intelligent search. ++ */ ++ ++static int yaffs_obj_cache_dirty(struct yaffs_obj *obj) ++{ ++ struct yaffs_dev *dev = obj->my_dev; ++ int i; ++ struct yaffs_cache *cache; ++ int n_caches = obj->my_dev->param.n_caches; ++ ++ for (i = 0; i < n_caches; i++) { ++ cache = &dev->cache[i]; ++ if (cache->object == obj && cache->dirty) ++ return 1; ++ } ++ ++ return 0; ++} ++ ++static void yaffs_flush_file_cache(struct yaffs_obj *obj) ++{ ++ struct yaffs_dev *dev = obj->my_dev; ++ int lowest = -99; /* Stop compiler whining. */ ++ int i; ++ struct yaffs_cache *cache; ++ int chunk_written = 0; ++ int n_caches = obj->my_dev->param.n_caches; ++ ++ if (n_caches < 1) ++ return; ++ do { ++ cache = NULL; ++ ++ /* Find the lowest dirty chunk for this object */ ++ for (i = 0; i < n_caches; i++) { ++ if (dev->cache[i].object == obj && ++ dev->cache[i].dirty) { ++ if (!cache || ++ dev->cache[i].chunk_id < lowest) { ++ cache = &dev->cache[i]; ++ lowest = cache->chunk_id; ++ } ++ } ++ } ++ ++ if (cache && !cache->locked) { ++ /* Write it out and free it up */ ++ chunk_written = ++ yaffs_wr_data_obj(cache->object, ++ cache->chunk_id, ++ cache->data, ++ cache->n_bytes, 1); ++ cache->dirty = 0; ++ cache->object = NULL; ++ } ++ } while (cache && chunk_written > 0); ++ ++ if (cache) ++ /* Hoosterman, disk full while writing cache out. */ ++ yaffs_trace(YAFFS_TRACE_ERROR, ++ "yaffs tragedy: no space during cache write"); ++} ++ ++/*yaffs_flush_whole_cache(dev) ++ * ++ * ++ */ ++ ++void yaffs_flush_whole_cache(struct yaffs_dev *dev) ++{ ++ struct yaffs_obj *obj; ++ int n_caches = dev->param.n_caches; ++ int i; ++ ++ /* Find a dirty object in the cache and flush it... ++ * until there are no further dirty objects. ++ */ ++ do { ++ obj = NULL; ++ for (i = 0; i < n_caches && !obj; i++) { ++ if (dev->cache[i].object && dev->cache[i].dirty) ++ obj = dev->cache[i].object; ++ } ++ if (obj) ++ yaffs_flush_file_cache(obj); ++ } while (obj); ++ ++} ++ ++/* Grab us a cache chunk for use. ++ * First look for an empty one. ++ * Then look for the least recently used non-dirty one. ++ * Then look for the least recently used dirty one...., flush and look again. ++ */ ++static struct yaffs_cache *yaffs_grab_chunk_worker(struct yaffs_dev *dev) ++{ ++ int i; ++ ++ if (dev->param.n_caches > 0) { ++ for (i = 0; i < dev->param.n_caches; i++) { ++ if (!dev->cache[i].object) ++ return &dev->cache[i]; ++ } ++ } ++ return NULL; ++} ++ ++static struct yaffs_cache *yaffs_grab_chunk_cache(struct yaffs_dev *dev) ++{ ++ struct yaffs_cache *cache; ++ struct yaffs_obj *the_obj; ++ int usage; ++ int i; ++ int pushout; ++ ++ if (dev->param.n_caches < 1) ++ return NULL; ++ ++ /* Try find a non-dirty one... */ ++ ++ cache = yaffs_grab_chunk_worker(dev); ++ ++ if (!cache) { ++ /* They were all dirty, find the LRU object and flush ++ * its cache, then find again. ++ * NB what's here is not very accurate, ++ * we actually flush the object with the LRU chunk. ++ */ ++ ++ /* With locking we can't assume we can use entry zero, ++ * Set the_obj to a valid pointer for Coverity. */ ++ the_obj = dev->cache[0].object; ++ usage = -1; ++ cache = NULL; ++ pushout = -1; ++ ++ for (i = 0; i < dev->param.n_caches; i++) { ++ if (dev->cache[i].object && ++ !dev->cache[i].locked && ++ (dev->cache[i].last_use < usage || ++ !cache)) { ++ usage = dev->cache[i].last_use; ++ the_obj = dev->cache[i].object; ++ cache = &dev->cache[i]; ++ pushout = i; ++ } ++ } ++ ++ if (!cache || cache->dirty) { ++ /* Flush and try again */ ++ yaffs_flush_file_cache(the_obj); ++ cache = yaffs_grab_chunk_worker(dev); ++ } ++ } ++ return cache; ++} ++ ++/* Find a cached chunk */ ++static struct yaffs_cache *yaffs_find_chunk_cache(const struct yaffs_obj *obj, ++ int chunk_id) ++{ ++ struct yaffs_dev *dev = obj->my_dev; ++ int i; ++ ++ if (dev->param.n_caches < 1) ++ return NULL; ++ ++ for (i = 0; i < dev->param.n_caches; i++) { ++ if (dev->cache[i].object == obj && ++ dev->cache[i].chunk_id == chunk_id) { ++ dev->cache_hits++; ++ ++ return &dev->cache[i]; ++ } ++ } ++ return NULL; ++} ++ ++/* Mark the chunk for the least recently used algorithym */ ++static void yaffs_use_cache(struct yaffs_dev *dev, struct yaffs_cache *cache, ++ int is_write) ++{ ++ int i; ++ ++ if (dev->param.n_caches < 1) ++ return; ++ ++ if (dev->cache_last_use < 0 || ++ dev->cache_last_use > 100000000) { ++ /* Reset the cache usages */ ++ for (i = 1; i < dev->param.n_caches; i++) ++ dev->cache[i].last_use = 0; ++ ++ dev->cache_last_use = 0; ++ } ++ dev->cache_last_use++; ++ cache->last_use = dev->cache_last_use; ++ ++ if (is_write) ++ cache->dirty = 1; ++} ++ ++/* Invalidate a single cache page. ++ * Do this when a whole page gets written, ++ * ie the short cache for this page is no longer valid. ++ */ ++static void yaffs_invalidate_chunk_cache(struct yaffs_obj *object, int chunk_id) ++{ ++ struct yaffs_cache *cache; ++ ++ if (object->my_dev->param.n_caches > 0) { ++ cache = yaffs_find_chunk_cache(object, chunk_id); ++ ++ if (cache) ++ cache->object = NULL; ++ } ++} ++ ++/* Invalidate all the cache pages associated with this object ++ * Do this whenever ther file is deleted or resized. ++ */ ++static void yaffs_invalidate_whole_cache(struct yaffs_obj *in) ++{ ++ int i; ++ struct yaffs_dev *dev = in->my_dev; ++ ++ if (dev->param.n_caches > 0) { ++ /* Invalidate it. */ ++ for (i = 0; i < dev->param.n_caches; i++) { ++ if (dev->cache[i].object == in) ++ dev->cache[i].object = NULL; ++ } ++ } ++} ++ ++static void yaffs_unhash_obj(struct yaffs_obj *obj) ++{ ++ int bucket; ++ struct yaffs_dev *dev = obj->my_dev; ++ ++ /* If it is still linked into the bucket list, free from the list */ ++ if (!list_empty(&obj->hash_link)) { ++ list_del_init(&obj->hash_link); ++ bucket = yaffs_hash_fn(obj->obj_id); ++ dev->obj_bucket[bucket].count--; ++ } ++} ++ ++/* FreeObject frees up a Object and puts it back on the free list */ ++static void yaffs_free_obj(struct yaffs_obj *obj) ++{ ++ struct yaffs_dev *dev; ++ ++ if (!obj) { ++ BUG(); ++ return; ++ } ++ dev = obj->my_dev; ++ yaffs_trace(YAFFS_TRACE_OS, "FreeObject %p inode %p", ++ obj, obj->my_inode); ++ if (obj->parent) ++ BUG(); ++ if (!list_empty(&obj->siblings)) ++ BUG(); ++ ++ if (obj->my_inode) { ++ /* We're still hooked up to a cached inode. ++ * Don't delete now, but mark for later deletion ++ */ ++ obj->defered_free = 1; ++ return; ++ } ++ ++ yaffs_unhash_obj(obj); ++ ++ yaffs_free_raw_obj(dev, obj); ++ dev->n_obj--; ++ dev->checkpoint_blocks_required = 0; /* force recalculation */ ++} ++ ++void yaffs_handle_defered_free(struct yaffs_obj *obj) ++{ ++ if (obj->defered_free) ++ yaffs_free_obj(obj); ++} ++ ++static int yaffs_generic_obj_del(struct yaffs_obj *in) ++{ ++ /* Iinvalidate the file's data in the cache, without flushing. */ ++ yaffs_invalidate_whole_cache(in); ++ ++ if (in->my_dev->param.is_yaffs2 && in->parent != in->my_dev->del_dir) { ++ /* Move to unlinked directory so we have a deletion record */ ++ yaffs_change_obj_name(in, in->my_dev->del_dir, _Y("deleted"), 0, ++ 0); ++ } ++ ++ yaffs_remove_obj_from_dir(in); ++ yaffs_chunk_del(in->my_dev, in->hdr_chunk, 1, __LINE__); ++ in->hdr_chunk = 0; ++ ++ yaffs_free_obj(in); ++ return YAFFS_OK; ++ ++} ++ ++static void yaffs_soft_del_file(struct yaffs_obj *obj) ++{ ++ if (!obj->deleted || ++ obj->variant_type != YAFFS_OBJECT_TYPE_FILE || ++ obj->soft_del) ++ return; ++ ++ if (obj->n_data_chunks <= 0) { ++ /* Empty file with no duplicate object headers, ++ * just delete it immediately */ ++ yaffs_free_tnode(obj->my_dev, obj->variant.file_variant.top); ++ obj->variant.file_variant.top = NULL; ++ yaffs_trace(YAFFS_TRACE_TRACING, ++ "yaffs: Deleting empty file %d", ++ obj->obj_id); ++ yaffs_generic_obj_del(obj); ++ } else { ++ yaffs_soft_del_worker(obj, ++ obj->variant.file_variant.top, ++ obj->variant. ++ file_variant.top_level, 0); ++ obj->soft_del = 1; ++ } ++} ++ ++/* Pruning removes any part of the file structure tree that is beyond the ++ * bounds of the file (ie that does not point to chunks). ++ * ++ * A file should only get pruned when its size is reduced. ++ * ++ * Before pruning, the chunks must be pulled from the tree and the ++ * level 0 tnode entries must be zeroed out. ++ * Could also use this for file deletion, but that's probably better handled ++ * by a special case. ++ * ++ * This function is recursive. For levels > 0 the function is called again on ++ * any sub-tree. For level == 0 we just check if the sub-tree has data. ++ * If there is no data in a subtree then it is pruned. ++ */ ++ ++static struct yaffs_tnode *yaffs_prune_worker(struct yaffs_dev *dev, ++ struct yaffs_tnode *tn, u32 level, ++ int del0) ++{ ++ int i; ++ int has_data; ++ ++ if (!tn) ++ return tn; ++ ++ has_data = 0; ++ ++ if (level > 0) { ++ for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) { ++ if (tn->internal[i]) { ++ tn->internal[i] = ++ yaffs_prune_worker(dev, ++ tn->internal[i], ++ level - 1, ++ (i == 0) ? del0 : 1); ++ } ++ ++ if (tn->internal[i]) ++ has_data++; ++ } ++ } else { ++ int tnode_size_u32 = dev->tnode_size / sizeof(u32); ++ u32 *map = (u32 *) tn; ++ ++ for (i = 0; !has_data && i < tnode_size_u32; i++) { ++ if (map[i]) ++ has_data++; ++ } ++ } ++ ++ if (has_data == 0 && del0) { ++ /* Free and return NULL */ ++ yaffs_free_tnode(dev, tn); ++ tn = NULL; ++ } ++ return tn; ++} ++ ++static int yaffs_prune_tree(struct yaffs_dev *dev, ++ struct yaffs_file_var *file_struct) ++{ ++ int i; ++ int has_data; ++ int done = 0; ++ struct yaffs_tnode *tn; ++ ++ if (file_struct->top_level < 1) ++ return YAFFS_OK; ++ ++ file_struct->top = ++ yaffs_prune_worker(dev, file_struct->top, file_struct->top_level, 0); ++ ++ /* Now we have a tree with all the non-zero branches NULL but ++ * the height is the same as it was. ++ * Let's see if we can trim internal tnodes to shorten the tree. ++ * We can do this if only the 0th element in the tnode is in use ++ * (ie all the non-zero are NULL) ++ */ ++ ++ while (file_struct->top_level && !done) { ++ tn = file_struct->top; ++ ++ has_data = 0; ++ for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) { ++ if (tn->internal[i]) ++ has_data++; ++ } ++ ++ if (!has_data) { ++ file_struct->top = tn->internal[0]; ++ file_struct->top_level--; ++ yaffs_free_tnode(dev, tn); ++ } else { ++ done = 1; ++ } ++ } ++ ++ return YAFFS_OK; ++} ++ ++/*-------------------- End of File Structure functions.-------------------*/ ++ ++/* alloc_empty_obj gets us a clean Object.*/ ++static struct yaffs_obj *yaffs_alloc_empty_obj(struct yaffs_dev *dev) ++{ ++ struct yaffs_obj *obj = yaffs_alloc_raw_obj(dev); ++ ++ if (!obj) ++ return obj; ++ ++ dev->n_obj++; ++ ++ /* Now sweeten it up... */ ++ ++ memset(obj, 0, sizeof(struct yaffs_obj)); ++ obj->being_created = 1; ++ ++ obj->my_dev = dev; ++ obj->hdr_chunk = 0; ++ obj->variant_type = YAFFS_OBJECT_TYPE_UNKNOWN; ++ INIT_LIST_HEAD(&(obj->hard_links)); ++ INIT_LIST_HEAD(&(obj->hash_link)); ++ INIT_LIST_HEAD(&obj->siblings); ++ ++ /* Now make the directory sane */ ++ if (dev->root_dir) { ++ obj->parent = dev->root_dir; ++ list_add(&(obj->siblings), ++ &dev->root_dir->variant.dir_variant.children); ++ } ++ ++ /* Add it to the lost and found directory. ++ * NB Can't put root or lost-n-found in lost-n-found so ++ * check if lost-n-found exists first ++ */ ++ if (dev->lost_n_found) ++ yaffs_add_obj_to_dir(dev->lost_n_found, obj); ++ ++ obj->being_created = 0; ++ ++ dev->checkpoint_blocks_required = 0; /* force recalculation */ ++ ++ return obj; ++} ++ ++static int yaffs_find_nice_bucket(struct yaffs_dev *dev) ++{ ++ int i; ++ int l = 999; ++ int lowest = 999999; ++ ++ /* Search for the shortest list or one that ++ * isn't too long. ++ */ ++ ++ for (i = 0; i < 10 && lowest > 4; i++) { ++ dev->bucket_finder++; ++ dev->bucket_finder %= YAFFS_NOBJECT_BUCKETS; ++ if (dev->obj_bucket[dev->bucket_finder].count < lowest) { ++ lowest = dev->obj_bucket[dev->bucket_finder].count; ++ l = dev->bucket_finder; ++ } ++ } ++ ++ return l; ++} ++ ++static int yaffs_new_obj_id(struct yaffs_dev *dev) ++{ ++ int bucket = yaffs_find_nice_bucket(dev); ++ int found = 0; ++ struct list_head *i; ++ u32 n = (u32) bucket; ++ ++ /* Now find an object value that has not already been taken ++ * by scanning the list. ++ */ ++ ++ while (!found) { ++ found = 1; ++ n += YAFFS_NOBJECT_BUCKETS; ++ if (1 || dev->obj_bucket[bucket].count > 0) { ++ list_for_each(i, &dev->obj_bucket[bucket].list) { ++ /* If there is already one in the list */ ++ if (i && list_entry(i, struct yaffs_obj, ++ hash_link)->obj_id == n) { ++ found = 0; ++ } ++ } ++ } ++ } ++ return n; ++} ++ ++static void yaffs_hash_obj(struct yaffs_obj *in) ++{ ++ int bucket = yaffs_hash_fn(in->obj_id); ++ struct yaffs_dev *dev = in->my_dev; ++ ++ list_add(&in->hash_link, &dev->obj_bucket[bucket].list); ++ dev->obj_bucket[bucket].count++; ++} ++ ++struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number) ++{ ++ int bucket = yaffs_hash_fn(number); ++ struct list_head *i; ++ struct yaffs_obj *in; ++ ++ list_for_each(i, &dev->obj_bucket[bucket].list) { ++ /* Look if it is in the list */ ++ in = list_entry(i, struct yaffs_obj, hash_link); ++ if (in->obj_id == number) { ++ /* Don't show if it is defered free */ ++ if (in->defered_free) ++ return NULL; ++ return in; ++ } ++ } ++ ++ return NULL; ++} ++ ++static struct yaffs_obj *yaffs_new_obj(struct yaffs_dev *dev, int number, ++ enum yaffs_obj_type type) ++{ ++ struct yaffs_obj *the_obj = NULL; ++ struct yaffs_tnode *tn = NULL; ++ ++ if (number < 0) ++ number = yaffs_new_obj_id(dev); ++ ++ if (type == YAFFS_OBJECT_TYPE_FILE) { ++ tn = yaffs_get_tnode(dev); ++ if (!tn) ++ return NULL; ++ } ++ ++ the_obj = yaffs_alloc_empty_obj(dev); ++ if (!the_obj) { ++ if (tn) ++ yaffs_free_tnode(dev, tn); ++ return NULL; ++ } ++ ++ the_obj->fake = 0; ++ the_obj->rename_allowed = 1; ++ the_obj->unlink_allowed = 1; ++ the_obj->obj_id = number; ++ yaffs_hash_obj(the_obj); ++ the_obj->variant_type = type; ++ yaffs_load_current_time(the_obj, 1, 1); ++ ++ switch (type) { ++ case YAFFS_OBJECT_TYPE_FILE: ++ the_obj->variant.file_variant.file_size = 0; ++ the_obj->variant.file_variant.scanned_size = 0; ++ the_obj->variant.file_variant.shrink_size = ++ yaffs_max_file_size(dev); ++ the_obj->variant.file_variant.top_level = 0; ++ the_obj->variant.file_variant.top = tn; ++ break; ++ case YAFFS_OBJECT_TYPE_DIRECTORY: ++ INIT_LIST_HEAD(&the_obj->variant.dir_variant.children); ++ INIT_LIST_HEAD(&the_obj->variant.dir_variant.dirty); ++ break; ++ case YAFFS_OBJECT_TYPE_SYMLINK: ++ case YAFFS_OBJECT_TYPE_HARDLINK: ++ case YAFFS_OBJECT_TYPE_SPECIAL: ++ /* No action required */ ++ break; ++ case YAFFS_OBJECT_TYPE_UNKNOWN: ++ /* todo this should not happen */ ++ break; ++ } ++ return the_obj; ++} ++ ++static struct yaffs_obj *yaffs_create_fake_dir(struct yaffs_dev *dev, ++ int number, u32 mode) ++{ ++ ++ struct yaffs_obj *obj = ++ yaffs_new_obj(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY); ++ ++ if (!obj) ++ return NULL; ++ ++ obj->fake = 1; /* it is fake so it might not use NAND */ ++ obj->rename_allowed = 0; ++ obj->unlink_allowed = 0; ++ obj->deleted = 0; ++ obj->unlinked = 0; ++ obj->yst_mode = mode; ++ obj->my_dev = dev; ++ obj->hdr_chunk = 0; /* Not a valid chunk. */ ++ return obj; ++ ++} ++ ++ ++static void yaffs_init_tnodes_and_objs(struct yaffs_dev *dev) ++{ ++ int i; ++ ++ dev->n_obj = 0; ++ dev->n_tnodes = 0; ++ yaffs_init_raw_tnodes_and_objs(dev); ++ ++ for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) { ++ INIT_LIST_HEAD(&dev->obj_bucket[i].list); ++ dev->obj_bucket[i].count = 0; ++ } ++} ++ ++struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev, ++ int number, ++ enum yaffs_obj_type type) ++{ ++ struct yaffs_obj *the_obj = NULL; ++ ++ if (number > 0) ++ the_obj = yaffs_find_by_number(dev, number); ++ ++ if (!the_obj) ++ the_obj = yaffs_new_obj(dev, number, type); ++ ++ return the_obj; ++ ++} ++ ++YCHAR *yaffs_clone_str(const YCHAR *str) ++{ ++ YCHAR *new_str = NULL; ++ int len; ++ ++ if (!str) ++ str = _Y(""); ++ ++ len = strnlen(str, YAFFS_MAX_ALIAS_LENGTH); ++ new_str = kmalloc((len + 1) * sizeof(YCHAR), GFP_NOFS); ++ if (new_str) { ++ strncpy(new_str, str, len); ++ new_str[len] = 0; ++ } ++ return new_str; ++ ++} ++/* ++ *yaffs_update_parent() handles fixing a directories mtime and ctime when a new ++ * link (ie. name) is created or deleted in the directory. ++ * ++ * ie. ++ * create dir/a : update dir's mtime/ctime ++ * rm dir/a: update dir's mtime/ctime ++ * modify dir/a: don't update dir's mtimme/ctime ++ * ++ * This can be handled immediately or defered. Defering helps reduce the number ++ * of updates when many files in a directory are changed within a brief period. ++ * ++ * If the directory updating is defered then yaffs_update_dirty_dirs must be ++ * called periodically. ++ */ ++ ++static void yaffs_update_parent(struct yaffs_obj *obj) ++{ ++ struct yaffs_dev *dev; ++ ++ if (!obj) ++ return; ++ dev = obj->my_dev; ++ obj->dirty = 1; ++ yaffs_load_current_time(obj, 0, 1); ++ if (dev->param.defered_dir_update) { ++ struct list_head *link = &obj->variant.dir_variant.dirty; ++ ++ if (list_empty(link)) { ++ list_add(link, &dev->dirty_dirs); ++ yaffs_trace(YAFFS_TRACE_BACKGROUND, ++ "Added object %d to dirty directories", ++ obj->obj_id); ++ } ++ ++ } else { ++ yaffs_update_oh(obj, NULL, 0, 0, 0, NULL); ++ } ++} ++ ++void yaffs_update_dirty_dirs(struct yaffs_dev *dev) ++{ ++ struct list_head *link; ++ struct yaffs_obj *obj; ++ struct yaffs_dir_var *d_s; ++ union yaffs_obj_var *o_v; ++ ++ yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update dirty directories"); ++ ++ while (!list_empty(&dev->dirty_dirs)) { ++ link = dev->dirty_dirs.next; ++ list_del_init(link); ++ ++ d_s = list_entry(link, struct yaffs_dir_var, dirty); ++ o_v = list_entry(d_s, union yaffs_obj_var, dir_variant); ++ obj = list_entry(o_v, struct yaffs_obj, variant); ++ ++ yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update directory %d", ++ obj->obj_id); ++ ++ if (obj->dirty) ++ yaffs_update_oh(obj, NULL, 0, 0, 0, NULL); ++ } ++} ++ ++/* ++ * Mknod (create) a new object. ++ * equiv_obj only has meaning for a hard link; ++ * alias_str only has meaning for a symlink. ++ * rdev only has meaning for devices (a subset of special objects) ++ */ ++ ++static struct yaffs_obj *yaffs_create_obj(enum yaffs_obj_type type, ++ struct yaffs_obj *parent, ++ const YCHAR *name, ++ u32 mode, ++ u32 uid, ++ u32 gid, ++ struct yaffs_obj *equiv_obj, ++ const YCHAR *alias_str, u32 rdev) ++{ ++ struct yaffs_obj *in; ++ YCHAR *str = NULL; ++ struct yaffs_dev *dev = parent->my_dev; ++ ++ /* Check if the entry exists. ++ * If it does then fail the call since we don't want a dup. */ ++ if (yaffs_find_by_name(parent, name)) ++ return NULL; ++ ++ if (type == YAFFS_OBJECT_TYPE_SYMLINK) { ++ str = yaffs_clone_str(alias_str); ++ if (!str) ++ return NULL; ++ } ++ ++ in = yaffs_new_obj(dev, -1, type); ++ ++ if (!in) { ++ kfree(str); ++ return NULL; ++ } ++ ++ in->hdr_chunk = 0; ++ in->valid = 1; ++ in->variant_type = type; ++ ++ in->yst_mode = mode; ++ ++ yaffs_attribs_init(in, gid, uid, rdev); ++ ++ in->n_data_chunks = 0; ++ ++ yaffs_set_obj_name(in, name); ++ in->dirty = 1; ++ ++ yaffs_add_obj_to_dir(parent, in); ++ ++ in->my_dev = parent->my_dev; ++ ++ switch (type) { ++ case YAFFS_OBJECT_TYPE_SYMLINK: ++ in->variant.symlink_variant.alias = str; ++ break; ++ case YAFFS_OBJECT_TYPE_HARDLINK: ++ in->variant.hardlink_variant.equiv_obj = equiv_obj; ++ in->variant.hardlink_variant.equiv_id = equiv_obj->obj_id; ++ list_add(&in->hard_links, &equiv_obj->hard_links); ++ break; ++ case YAFFS_OBJECT_TYPE_FILE: ++ case YAFFS_OBJECT_TYPE_DIRECTORY: ++ case YAFFS_OBJECT_TYPE_SPECIAL: ++ case YAFFS_OBJECT_TYPE_UNKNOWN: ++ /* do nothing */ ++ break; ++ } ++ ++ if (yaffs_update_oh(in, name, 0, 0, 0, NULL) < 0) { ++ /* Could not create the object header, fail */ ++ yaffs_del_obj(in); ++ in = NULL; ++ } ++ ++ if (in) ++ yaffs_update_parent(parent); ++ ++ return in; ++} ++ ++struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent, ++ const YCHAR *name, u32 mode, u32 uid, ++ u32 gid) ++{ ++ return yaffs_create_obj(YAFFS_OBJECT_TYPE_FILE, parent, name, mode, ++ uid, gid, NULL, NULL, 0); ++} ++ ++struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR *name, ++ u32 mode, u32 uid, u32 gid) ++{ ++ return yaffs_create_obj(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name, ++ mode, uid, gid, NULL, NULL, 0); ++} ++ ++struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent, ++ const YCHAR *name, u32 mode, u32 uid, ++ u32 gid, u32 rdev) ++{ ++ return yaffs_create_obj(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode, ++ uid, gid, NULL, NULL, rdev); ++} ++ ++struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent, ++ const YCHAR *name, u32 mode, u32 uid, ++ u32 gid, const YCHAR *alias) ++{ ++ return yaffs_create_obj(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode, ++ uid, gid, NULL, alias, 0); ++} ++ ++/* yaffs_link_obj returns the object id of the equivalent object.*/ ++struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR * name, ++ struct yaffs_obj *equiv_obj) ++{ ++ /* Get the real object in case we were fed a hard link obj */ ++ equiv_obj = yaffs_get_equivalent_obj(equiv_obj); ++ ++ if (yaffs_create_obj(YAFFS_OBJECT_TYPE_HARDLINK, ++ parent, name, 0, 0, 0, ++ equiv_obj, NULL, 0)) ++ return equiv_obj; ++ ++ return NULL; ++ ++} ++ ++ ++ ++/*---------------------- Block Management and Page Allocation -------------*/ ++ ++static void yaffs_deinit_blocks(struct yaffs_dev *dev) ++{ ++ if (dev->block_info_alt && dev->block_info) ++ vfree(dev->block_info); ++ else ++ kfree(dev->block_info); ++ ++ dev->block_info_alt = 0; ++ ++ dev->block_info = NULL; ++ ++ if (dev->chunk_bits_alt && dev->chunk_bits) ++ vfree(dev->chunk_bits); ++ else ++ kfree(dev->chunk_bits); ++ dev->chunk_bits_alt = 0; ++ dev->chunk_bits = NULL; ++} ++ ++static int yaffs_init_blocks(struct yaffs_dev *dev) ++{ ++ int n_blocks = dev->internal_end_block - dev->internal_start_block + 1; ++ ++ dev->block_info = NULL; ++ dev->chunk_bits = NULL; ++ dev->alloc_block = -1; /* force it to get a new one */ ++ ++ /* If the first allocation strategy fails, thry the alternate one */ ++ dev->block_info = ++ kmalloc(n_blocks * sizeof(struct yaffs_block_info), GFP_NOFS); ++ if (!dev->block_info) { ++ dev->block_info = ++ vmalloc(n_blocks * sizeof(struct yaffs_block_info)); ++ dev->block_info_alt = 1; ++ } else { ++ dev->block_info_alt = 0; ++ } ++ ++ if (!dev->block_info) ++ goto alloc_error; ++ ++ /* Set up dynamic blockinfo stuff. Round up bytes. */ ++ dev->chunk_bit_stride = (dev->param.chunks_per_block + 7) / 8; ++ dev->chunk_bits = ++ kmalloc(dev->chunk_bit_stride * n_blocks, GFP_NOFS); ++ if (!dev->chunk_bits) { ++ dev->chunk_bits = ++ vmalloc(dev->chunk_bit_stride * n_blocks); ++ dev->chunk_bits_alt = 1; ++ } else { ++ dev->chunk_bits_alt = 0; ++ } ++ if (!dev->chunk_bits) ++ goto alloc_error; ++ ++ ++ memset(dev->block_info, 0, n_blocks * sizeof(struct yaffs_block_info)); ++ memset(dev->chunk_bits, 0, dev->chunk_bit_stride * n_blocks); ++ return YAFFS_OK; ++ ++alloc_error: ++ yaffs_deinit_blocks(dev); ++ return YAFFS_FAIL; ++} ++ ++ ++void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no) ++{ ++ struct yaffs_block_info *bi = yaffs_get_block_info(dev, block_no); ++ int erased_ok = 0; ++ int i; ++ ++ /* If the block is still healthy erase it and mark as clean. ++ * If the block has had a data failure, then retire it. ++ */ ++ ++ yaffs_trace(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE, ++ "yaffs_block_became_dirty block %d state %d %s", ++ block_no, bi->block_state, ++ (bi->needs_retiring) ? "needs retiring" : ""); ++ ++ yaffs2_clear_oldest_dirty_seq(dev, bi); ++ ++ bi->block_state = YAFFS_BLOCK_STATE_DIRTY; ++ ++ /* If this is the block being garbage collected then stop gc'ing */ ++ if (block_no == dev->gc_block) ++ dev->gc_block = 0; ++ ++ /* If this block is currently the best candidate for gc ++ * then drop as a candidate */ ++ if (block_no == dev->gc_dirtiest) { ++ dev->gc_dirtiest = 0; ++ dev->gc_pages_in_use = 0; ++ } ++ ++ if (!bi->needs_retiring) { ++ yaffs2_checkpt_invalidate(dev); ++ erased_ok = yaffs_erase_block(dev, block_no); ++ if (!erased_ok) { ++ dev->n_erase_failures++; ++ yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS, ++ "**>> Erasure failed %d", block_no); ++ } ++ } ++ ++ /* Verify erasure if needed */ ++ if (erased_ok && ++ ((yaffs_trace_mask & YAFFS_TRACE_ERASE) || ++ !yaffs_skip_verification(dev))) { ++ for (i = 0; i < dev->param.chunks_per_block; i++) { ++ if (!yaffs_check_chunk_erased(dev, ++ block_no * dev->param.chunks_per_block + i)) { ++ yaffs_trace(YAFFS_TRACE_ERROR, ++ ">>Block %d erasure supposedly OK, but chunk %d not erased", ++ block_no, i); ++ } ++ } ++ } ++ ++ if (!erased_ok) { ++ /* We lost a block of free space */ ++ dev->n_free_chunks -= dev->param.chunks_per_block; ++ yaffs_retire_block(dev, block_no); ++ yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS, ++ "**>> Block %d retired", block_no); ++ return; ++ } ++ ++ /* Clean it up... */ ++ bi->block_state = YAFFS_BLOCK_STATE_EMPTY; ++ bi->seq_number = 0; ++ dev->n_erased_blocks++; ++ bi->pages_in_use = 0; ++ bi->soft_del_pages = 0; ++ bi->has_shrink_hdr = 0; ++ bi->skip_erased_check = 1; /* Clean, so no need to check */ ++ bi->gc_prioritise = 0; ++ bi->has_summary = 0; ++ ++ yaffs_clear_chunk_bits(dev, block_no); ++ ++ yaffs_trace(YAFFS_TRACE_ERASE, "Erased block %d", block_no); ++} ++ ++static inline int yaffs_gc_process_chunk(struct yaffs_dev *dev, ++ struct yaffs_block_info *bi, ++ int old_chunk, u8 *buffer) ++{ ++ int new_chunk; ++ int mark_flash = 1; ++ struct yaffs_ext_tags tags; ++ struct yaffs_obj *object; ++ int matching_chunk; ++ int ret_val = YAFFS_OK; ++ ++ memset(&tags, 0, sizeof(tags)); ++ yaffs_rd_chunk_tags_nand(dev, old_chunk, ++ buffer, &tags); ++ object = yaffs_find_by_number(dev, tags.obj_id); ++ ++ yaffs_trace(YAFFS_TRACE_GC_DETAIL, ++ "Collecting chunk in block %d, %d %d %d ", ++ dev->gc_chunk, tags.obj_id, ++ tags.chunk_id, tags.n_bytes); ++ ++ if (object && !yaffs_skip_verification(dev)) { ++ if (tags.chunk_id == 0) ++ matching_chunk = ++ object->hdr_chunk; ++ else if (object->soft_del) ++ /* Defeat the test */ ++ matching_chunk = old_chunk; ++ else ++ matching_chunk = ++ yaffs_find_chunk_in_file ++ (object, tags.chunk_id, ++ NULL); ++ ++ if (old_chunk != matching_chunk) ++ yaffs_trace(YAFFS_TRACE_ERROR, ++ "gc: page in gc mismatch: %d %d %d %d", ++ old_chunk, ++ matching_chunk, ++ tags.obj_id, ++ tags.chunk_id); ++ } ++ ++ if (!object) { ++ yaffs_trace(YAFFS_TRACE_ERROR, ++ "page %d in gc has no object: %d %d %d ", ++ old_chunk, ++ tags.obj_id, tags.chunk_id, ++ tags.n_bytes); ++ } ++ ++ if (object && ++ object->deleted && ++ object->soft_del && tags.chunk_id != 0) { ++ /* Data chunk in a soft deleted file, ++ * throw it away. ++ * It's a soft deleted data chunk, ++ * No need to copy this, just forget ++ * about it and fix up the object. ++ */ ++ ++ /* Free chunks already includes ++ * softdeleted chunks, how ever this ++ * chunk is going to soon be really ++ * deleted which will increment free ++ * chunks. We have to decrement free ++ * chunks so this works out properly. ++ */ ++ dev->n_free_chunks--; ++ bi->soft_del_pages--; ++ ++ object->n_data_chunks--; ++ if (object->n_data_chunks <= 0) { ++ /* remeber to clean up obj */ ++ dev->gc_cleanup_list[dev->n_clean_ups] = tags.obj_id; ++ dev->n_clean_ups++; ++ } ++ mark_flash = 0; ++ } else if (object) { ++ /* It's either a data chunk in a live ++ * file or an ObjectHeader, so we're ++ * interested in it. ++ * NB Need to keep the ObjectHeaders of ++ * deleted files until the whole file ++ * has been deleted off ++ */ ++ tags.serial_number++; ++ dev->n_gc_copies++; ++ ++ if (tags.chunk_id == 0) { ++ /* It is an object Id, ++ * We need to nuke the ++ * shrinkheader flags since its ++ * work is done. ++ * Also need to clean up ++ * shadowing. ++ */ ++ struct yaffs_obj_hdr *oh; ++ oh = (struct yaffs_obj_hdr *) buffer; ++ ++ oh->is_shrink = 0; ++ tags.extra_is_shrink = 0; ++ oh->shadows_obj = 0; ++ oh->inband_shadowed_obj_id = 0; ++ tags.extra_shadows = 0; ++ ++ /* Update file size */ ++ if (object->variant_type == YAFFS_OBJECT_TYPE_FILE) { ++ yaffs_oh_size_load(oh, ++ object->variant.file_variant.file_size); ++ tags.extra_file_size = ++ object->variant.file_variant.file_size; ++ } ++ ++ yaffs_verify_oh(object, oh, &tags, 1); ++ new_chunk = ++ yaffs_write_new_chunk(dev, (u8 *) oh, &tags, 1); ++ } else { ++ new_chunk = ++ yaffs_write_new_chunk(dev, buffer, &tags, 1); ++ } ++ ++ if (new_chunk < 0) { ++ ret_val = YAFFS_FAIL; ++ } else { ++ ++ /* Now fix up the Tnodes etc. */ ++ ++ if (tags.chunk_id == 0) { ++ /* It's a header */ ++ object->hdr_chunk = new_chunk; ++ object->serial = tags.serial_number; ++ } else { ++ /* It's a data chunk */ ++ yaffs_put_chunk_in_file(object, tags.chunk_id, ++ new_chunk, 0); ++ } ++ } ++ } ++ if (ret_val == YAFFS_OK) ++ yaffs_chunk_del(dev, old_chunk, mark_flash, __LINE__); ++ return ret_val; ++} ++ ++static int yaffs_gc_block(struct yaffs_dev *dev, int block, int whole_block) ++{ ++ int old_chunk; ++ int ret_val = YAFFS_OK; ++ int i; ++ int is_checkpt_block; ++ int max_copies; ++ int chunks_before = yaffs_get_erased_chunks(dev); ++ int chunks_after; ++ struct yaffs_block_info *bi = yaffs_get_block_info(dev, block); ++ ++ is_checkpt_block = (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT); ++ ++ yaffs_trace(YAFFS_TRACE_TRACING, ++ "Collecting block %d, in use %d, shrink %d, whole_block %d", ++ block, bi->pages_in_use, bi->has_shrink_hdr, ++ whole_block); ++ ++ /*yaffs_verify_free_chunks(dev); */ ++ ++ if (bi->block_state == YAFFS_BLOCK_STATE_FULL) ++ bi->block_state = YAFFS_BLOCK_STATE_COLLECTING; ++ ++ bi->has_shrink_hdr = 0; /* clear the flag so that the block can erase */ ++ ++ dev->gc_disable = 1; ++ ++ yaffs_summary_gc(dev, block); ++ ++ if (is_checkpt_block || !yaffs_still_some_chunks(dev, block)) { ++ yaffs_trace(YAFFS_TRACE_TRACING, ++ "Collecting block %d that has no chunks in use", ++ block); ++ yaffs_block_became_dirty(dev, block); ++ } else { ++ ++ u8 *buffer = yaffs_get_temp_buffer(dev); ++ ++ yaffs_verify_blk(dev, bi, block); ++ ++ max_copies = (whole_block) ? dev->param.chunks_per_block : 5; ++ old_chunk = block * dev->param.chunks_per_block + dev->gc_chunk; ++ ++ for (/* init already done */ ; ++ ret_val == YAFFS_OK && ++ dev->gc_chunk < dev->param.chunks_per_block && ++ (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) && ++ max_copies > 0; ++ dev->gc_chunk++, old_chunk++) { ++ if (yaffs_check_chunk_bit(dev, block, dev->gc_chunk)) { ++ /* Page is in use and might need to be copied */ ++ max_copies--; ++ ret_val = yaffs_gc_process_chunk(dev, bi, ++ old_chunk, buffer); ++ } ++ } ++ yaffs_release_temp_buffer(dev, buffer); ++ } ++ ++ yaffs_verify_collected_blk(dev, bi, block); ++ ++ if (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) { ++ /* ++ * The gc did not complete. Set block state back to FULL ++ * because checkpointing does not restore gc. ++ */ ++ bi->block_state = YAFFS_BLOCK_STATE_FULL; ++ } else { ++ /* The gc completed. */ ++ /* Do any required cleanups */ ++ for (i = 0; i < dev->n_clean_ups; i++) { ++ /* Time to delete the file too */ ++ struct yaffs_obj *object = ++ yaffs_find_by_number(dev, dev->gc_cleanup_list[i]); ++ if (object) { ++ yaffs_free_tnode(dev, ++ object->variant.file_variant.top); ++ object->variant.file_variant.top = NULL; ++ yaffs_trace(YAFFS_TRACE_GC, ++ "yaffs: About to finally delete object %d", ++ object->obj_id); ++ yaffs_generic_obj_del(object); ++ object->my_dev->n_deleted_files--; ++ } ++ ++ } ++ chunks_after = yaffs_get_erased_chunks(dev); ++ if (chunks_before >= chunks_after) ++ yaffs_trace(YAFFS_TRACE_GC, ++ "gc did not increase free chunks before %d after %d", ++ chunks_before, chunks_after); ++ dev->gc_block = 0; ++ dev->gc_chunk = 0; ++ dev->n_clean_ups = 0; ++ } ++ ++ dev->gc_disable = 0; ++ ++ return ret_val; ++} ++ ++/* ++ * find_gc_block() selects the dirtiest block (or close enough) ++ * for garbage collection. ++ */ ++ ++static unsigned yaffs_find_gc_block(struct yaffs_dev *dev, ++ int aggressive, int background) ++{ ++ int i; ++ int iterations; ++ unsigned selected = 0; ++ int prioritised = 0; ++ int prioritised_exist = 0; ++ struct yaffs_block_info *bi; ++ int threshold; ++ ++ /* First let's see if we need to grab a prioritised block */ ++ if (dev->has_pending_prioritised_gc && !aggressive) { ++ dev->gc_dirtiest = 0; ++ bi = dev->block_info; ++ for (i = dev->internal_start_block; ++ i <= dev->internal_end_block && !selected; i++) { ++ ++ if (bi->gc_prioritise) { ++ prioritised_exist = 1; ++ if (bi->block_state == YAFFS_BLOCK_STATE_FULL && ++ yaffs_block_ok_for_gc(dev, bi)) { ++ selected = i; ++ prioritised = 1; ++ } ++ } ++ bi++; ++ } ++ ++ /* ++ * If there is a prioritised block and none was selected then ++ * this happened because there is at least one old dirty block ++ * gumming up the works. Let's gc the oldest dirty block. ++ */ ++ ++ if (prioritised_exist && ++ !selected && dev->oldest_dirty_block > 0) ++ selected = dev->oldest_dirty_block; ++ ++ if (!prioritised_exist) /* None found, so we can clear this */ ++ dev->has_pending_prioritised_gc = 0; ++ } ++ ++ /* If we're doing aggressive GC then we are happy to take a less-dirty ++ * block, and search harder. ++ * else (leasurely gc), then we only bother to do this if the ++ * block has only a few pages in use. ++ */ ++ ++ if (!selected) { ++ int pages_used; ++ int n_blocks = ++ dev->internal_end_block - dev->internal_start_block + 1; ++ if (aggressive) { ++ threshold = dev->param.chunks_per_block; ++ iterations = n_blocks; ++ } else { ++ int max_threshold; ++ ++ if (background) ++ max_threshold = dev->param.chunks_per_block / 2; ++ else ++ max_threshold = dev->param.chunks_per_block / 8; ++ ++ if (max_threshold < YAFFS_GC_PASSIVE_THRESHOLD) ++ max_threshold = YAFFS_GC_PASSIVE_THRESHOLD; ++ ++ threshold = background ? (dev->gc_not_done + 2) * 2 : 0; ++ if (threshold < YAFFS_GC_PASSIVE_THRESHOLD) ++ threshold = YAFFS_GC_PASSIVE_THRESHOLD; ++ if (threshold > max_threshold) ++ threshold = max_threshold; ++ ++ iterations = n_blocks / 16 + 1; ++ if (iterations > 100) ++ iterations = 100; ++ } ++ ++ for (i = 0; ++ i < iterations && ++ (dev->gc_dirtiest < 1 || ++ dev->gc_pages_in_use > YAFFS_GC_GOOD_ENOUGH); ++ i++) { ++ dev->gc_block_finder++; ++ if (dev->gc_block_finder < dev->internal_start_block || ++ dev->gc_block_finder > dev->internal_end_block) ++ dev->gc_block_finder = ++ dev->internal_start_block; ++ ++ bi = yaffs_get_block_info(dev, dev->gc_block_finder); ++ ++ pages_used = bi->pages_in_use - bi->soft_del_pages; ++ ++ if (bi->block_state == YAFFS_BLOCK_STATE_FULL && ++ pages_used < dev->param.chunks_per_block && ++ (dev->gc_dirtiest < 1 || ++ pages_used < dev->gc_pages_in_use) && ++ yaffs_block_ok_for_gc(dev, bi)) { ++ dev->gc_dirtiest = dev->gc_block_finder; ++ dev->gc_pages_in_use = pages_used; ++ } ++ } ++ ++ if (dev->gc_dirtiest > 0 && dev->gc_pages_in_use <= threshold) ++ selected = dev->gc_dirtiest; ++ } ++ ++ /* ++ * If nothing has been selected for a while, try the oldest dirty ++ * because that's gumming up the works. ++ */ ++ ++ if (!selected && dev->param.is_yaffs2 && ++ dev->gc_not_done >= (background ? 10 : 20)) { ++ yaffs2_find_oldest_dirty_seq(dev); ++ if (dev->oldest_dirty_block > 0) { ++ selected = dev->oldest_dirty_block; ++ dev->gc_dirtiest = selected; ++ dev->oldest_dirty_gc_count++; ++ bi = yaffs_get_block_info(dev, selected); ++ dev->gc_pages_in_use = ++ bi->pages_in_use - bi->soft_del_pages; ++ } else { ++ dev->gc_not_done = 0; ++ } ++ } ++ ++ if (selected) { ++ yaffs_trace(YAFFS_TRACE_GC, ++ "GC Selected block %d with %d free, prioritised:%d", ++ selected, ++ dev->param.chunks_per_block - dev->gc_pages_in_use, ++ prioritised); ++ ++ dev->n_gc_blocks++; ++ if (background) ++ dev->bg_gcs++; ++ ++ dev->gc_dirtiest = 0; ++ dev->gc_pages_in_use = 0; ++ dev->gc_not_done = 0; ++ if (dev->refresh_skip > 0) ++ dev->refresh_skip--; ++ } else { ++ dev->gc_not_done++; ++ yaffs_trace(YAFFS_TRACE_GC, ++ "GC none: finder %d skip %d threshold %d dirtiest %d using %d oldest %d%s", ++ dev->gc_block_finder, dev->gc_not_done, threshold, ++ dev->gc_dirtiest, dev->gc_pages_in_use, ++ dev->oldest_dirty_block, background ? " bg" : ""); ++ } ++ ++ return selected; ++} ++ ++/* New garbage collector ++ * If we're very low on erased blocks then we do aggressive garbage collection ++ * otherwise we do "leasurely" garbage collection. ++ * Aggressive gc looks further (whole array) and will accept less dirty blocks. ++ * Passive gc only inspects smaller areas and only accepts more dirty blocks. ++ * ++ * The idea is to help clear out space in a more spread-out manner. ++ * Dunno if it really does anything useful. ++ */ ++static int yaffs_check_gc(struct yaffs_dev *dev, int background) ++{ ++ int aggressive = 0; ++ int gc_ok = YAFFS_OK; ++ int max_tries = 0; ++ int min_erased; ++ int erased_chunks; ++ int checkpt_block_adjust; ++ ++ if (dev->param.gc_control_fn && ++ (dev->param.gc_control_fn(dev) & 1) == 0) ++ return YAFFS_OK; ++ ++ if (dev->gc_disable) ++ /* Bail out so we don't get recursive gc */ ++ return YAFFS_OK; ++ ++ /* This loop should pass the first time. ++ * Only loops here if the collection does not increase space. ++ */ ++ ++ do { ++ max_tries++; ++ ++ checkpt_block_adjust = yaffs_calc_checkpt_blocks_required(dev); ++ ++ min_erased = ++ dev->param.n_reserved_blocks + checkpt_block_adjust + 1; ++ erased_chunks = ++ dev->n_erased_blocks * dev->param.chunks_per_block; ++ ++ /* If we need a block soon then do aggressive gc. */ ++ if (dev->n_erased_blocks < min_erased) ++ aggressive = 1; ++ else { ++ if (!background ++ && erased_chunks > (dev->n_free_chunks / 4)) ++ break; ++ ++ if (dev->gc_skip > 20) ++ dev->gc_skip = 20; ++ if (erased_chunks < dev->n_free_chunks / 2 || ++ dev->gc_skip < 1 || background) ++ aggressive = 0; ++ else { ++ dev->gc_skip--; ++ break; ++ } ++ } ++ ++ dev->gc_skip = 5; ++ ++ /* If we don't already have a block being gc'd then see if we ++ * should start another */ ++ ++ if (dev->gc_block < 1 && !aggressive) { ++ dev->gc_block = yaffs2_find_refresh_block(dev); ++ dev->gc_chunk = 0; ++ dev->n_clean_ups = 0; ++ } ++ if (dev->gc_block < 1) { ++ dev->gc_block = ++ yaffs_find_gc_block(dev, aggressive, background); ++ dev->gc_chunk = 0; ++ dev->n_clean_ups = 0; ++ } ++ ++ if (dev->gc_block > 0) { ++ dev->all_gcs++; ++ if (!aggressive) ++ dev->passive_gc_count++; ++ ++ yaffs_trace(YAFFS_TRACE_GC, ++ "yaffs: GC n_erased_blocks %d aggressive %d", ++ dev->n_erased_blocks, aggressive); ++ ++ gc_ok = yaffs_gc_block(dev, dev->gc_block, aggressive); ++ } ++ ++ if (dev->n_erased_blocks < (dev->param.n_reserved_blocks) && ++ dev->gc_block > 0) { ++ yaffs_trace(YAFFS_TRACE_GC, ++ "yaffs: GC !!!no reclaim!!! n_erased_blocks %d after try %d block %d", ++ dev->n_erased_blocks, max_tries, ++ dev->gc_block); ++ } ++ } while ((dev->n_erased_blocks < dev->param.n_reserved_blocks) && ++ (dev->gc_block > 0) && (max_tries < 2)); ++ ++ return aggressive ? gc_ok : YAFFS_OK; ++} ++ ++/* ++ * yaffs_bg_gc() ++ * Garbage collects. Intended to be called from a background thread. ++ * Returns non-zero if at least half the free chunks are erased. ++ */ ++int yaffs_bg_gc(struct yaffs_dev *dev, unsigned urgency) ++{ ++ int erased_chunks = dev->n_erased_blocks * dev->param.chunks_per_block; ++ ++ yaffs_trace(YAFFS_TRACE_BACKGROUND, "Background gc %u", urgency); ++ ++ yaffs_check_gc(dev, 1); ++ return erased_chunks > dev->n_free_chunks / 2; ++} ++ ++/*-------------------- Data file manipulation -----------------*/ ++ ++static int yaffs_rd_data_obj(struct yaffs_obj *in, int inode_chunk, u8 * buffer) ++{ ++ int nand_chunk = yaffs_find_chunk_in_file(in, inode_chunk, NULL); ++ ++ if (nand_chunk >= 0) ++ return yaffs_rd_chunk_tags_nand(in->my_dev, nand_chunk, ++ buffer, NULL); ++ else { ++ yaffs_trace(YAFFS_TRACE_NANDACCESS, ++ "Chunk %d not found zero instead", ++ nand_chunk); ++ /* get sane (zero) data if you read a hole */ ++ memset(buffer, 0, in->my_dev->data_bytes_per_chunk); ++ return 0; ++ } ++ ++} ++ ++void yaffs_chunk_del(struct yaffs_dev *dev, int chunk_id, int mark_flash, ++ int lyn) ++{ ++ int block; ++ int page; ++ struct yaffs_ext_tags tags; ++ struct yaffs_block_info *bi; ++ ++ if (chunk_id <= 0) ++ return; ++ ++ dev->n_deletions++; ++ block = chunk_id / dev->param.chunks_per_block; ++ page = chunk_id % dev->param.chunks_per_block; ++ ++ if (!yaffs_check_chunk_bit(dev, block, page)) ++ yaffs_trace(YAFFS_TRACE_VERIFY, ++ "Deleting invalid chunk %d", chunk_id); ++ ++ bi = yaffs_get_block_info(dev, block); ++ ++ yaffs2_update_oldest_dirty_seq(dev, block, bi); ++ ++ yaffs_trace(YAFFS_TRACE_DELETION, ++ "line %d delete of chunk %d", ++ lyn, chunk_id); ++ ++ if (!dev->param.is_yaffs2 && mark_flash && ++ bi->block_state != YAFFS_BLOCK_STATE_COLLECTING) { ++ ++ memset(&tags, 0, sizeof(tags)); ++ tags.is_deleted = 1; ++ yaffs_wr_chunk_tags_nand(dev, chunk_id, NULL, &tags); ++ yaffs_handle_chunk_update(dev, chunk_id, &tags); ++ } else { ++ dev->n_unmarked_deletions++; ++ } ++ ++ /* Pull out of the management area. ++ * If the whole block became dirty, this will kick off an erasure. ++ */ ++ if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING || ++ bi->block_state == YAFFS_BLOCK_STATE_FULL || ++ bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN || ++ bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) { ++ dev->n_free_chunks++; ++ yaffs_clear_chunk_bit(dev, block, page); ++ bi->pages_in_use--; ++ ++ if (bi->pages_in_use == 0 && ++ !bi->has_shrink_hdr && ++ bi->block_state != YAFFS_BLOCK_STATE_ALLOCATING && ++ bi->block_state != YAFFS_BLOCK_STATE_NEEDS_SCAN) { ++ yaffs_block_became_dirty(dev, block); ++ } ++ } ++} ++ ++static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk, ++ const u8 *buffer, int n_bytes, int use_reserve) ++{ ++ /* Find old chunk Need to do this to get serial number ++ * Write new one and patch into tree. ++ * Invalidate old tags. ++ */ ++ ++ int prev_chunk_id; ++ struct yaffs_ext_tags prev_tags; ++ int new_chunk_id; ++ struct yaffs_ext_tags new_tags; ++ struct yaffs_dev *dev = in->my_dev; ++ ++ yaffs_check_gc(dev, 0); ++ ++ /* Get the previous chunk at this location in the file if it exists. ++ * If it does not exist then put a zero into the tree. This creates ++ * the tnode now, rather than later when it is harder to clean up. ++ */ ++ prev_chunk_id = yaffs_find_chunk_in_file(in, inode_chunk, &prev_tags); ++ if (prev_chunk_id < 1 && ++ !yaffs_put_chunk_in_file(in, inode_chunk, 0, 0)) ++ return 0; ++ ++ /* Set up new tags */ ++ memset(&new_tags, 0, sizeof(new_tags)); ++ ++ new_tags.chunk_id = inode_chunk; ++ new_tags.obj_id = in->obj_id; ++ new_tags.serial_number = ++ (prev_chunk_id > 0) ? prev_tags.serial_number + 1 : 1; ++ new_tags.n_bytes = n_bytes; ++ ++ if (n_bytes < 1 || n_bytes > dev->param.total_bytes_per_chunk) { ++ yaffs_trace(YAFFS_TRACE_ERROR, ++ "Writing %d bytes to chunk!!!!!!!!!", ++ n_bytes); ++ BUG(); ++ } ++ ++ new_chunk_id = ++ yaffs_write_new_chunk(dev, buffer, &new_tags, use_reserve); ++ ++ if (new_chunk_id > 0) { ++ yaffs_put_chunk_in_file(in, inode_chunk, new_chunk_id, 0); ++ ++ if (prev_chunk_id > 0) ++ yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__); ++ ++ yaffs_verify_file_sane(in); ++ } ++ return new_chunk_id; ++ ++} ++ ++ ++ ++static int yaffs_do_xattrib_mod(struct yaffs_obj *obj, int set, ++ const YCHAR *name, const void *value, int size, ++ int flags) ++{ ++ struct yaffs_xattr_mod xmod; ++ int result; ++ ++ xmod.set = set; ++ xmod.name = name; ++ xmod.data = value; ++ xmod.size = size; ++ xmod.flags = flags; ++ xmod.result = -ENOSPC; ++ ++ result = yaffs_update_oh(obj, NULL, 0, 0, 0, &xmod); ++ ++ if (result > 0) ++ return xmod.result; ++ else ++ return -ENOSPC; ++} ++ ++static int yaffs_apply_xattrib_mod(struct yaffs_obj *obj, char *buffer, ++ struct yaffs_xattr_mod *xmod) ++{ ++ int retval = 0; ++ int x_offs = sizeof(struct yaffs_obj_hdr); ++ struct yaffs_dev *dev = obj->my_dev; ++ int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr); ++ char *x_buffer = buffer + x_offs; ++ ++ if (xmod->set) ++ retval = ++ nval_set(x_buffer, x_size, xmod->name, xmod->data, ++ xmod->size, xmod->flags); ++ else ++ retval = nval_del(x_buffer, x_size, xmod->name); ++ ++ obj->has_xattr = nval_hasvalues(x_buffer, x_size); ++ obj->xattr_known = 1; ++ xmod->result = retval; ++ ++ return retval; ++} ++ ++static int yaffs_do_xattrib_fetch(struct yaffs_obj *obj, const YCHAR *name, ++ void *value, int size) ++{ ++ char *buffer = NULL; ++ int result; ++ struct yaffs_ext_tags tags; ++ struct yaffs_dev *dev = obj->my_dev; ++ int x_offs = sizeof(struct yaffs_obj_hdr); ++ int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr); ++ char *x_buffer; ++ int retval = 0; ++ ++ if (obj->hdr_chunk < 1) ++ return -ENODATA; ++ ++ /* If we know that the object has no xattribs then don't do all the ++ * reading and parsing. ++ */ ++ if (obj->xattr_known && !obj->has_xattr) { ++ if (name) ++ return -ENODATA; ++ else ++ return 0; ++ } ++ ++ buffer = (char *)yaffs_get_temp_buffer(dev); ++ if (!buffer) ++ return -ENOMEM; ++ ++ result = ++ yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, (u8 *) buffer, &tags); ++ ++ if (result != YAFFS_OK) ++ retval = -ENOENT; ++ else { ++ x_buffer = buffer + x_offs; ++ ++ if (!obj->xattr_known) { ++ obj->has_xattr = nval_hasvalues(x_buffer, x_size); ++ obj->xattr_known = 1; ++ } ++ ++ if (name) ++ retval = nval_get(x_buffer, x_size, name, value, size); ++ else ++ retval = nval_list(x_buffer, x_size, value, size); ++ } ++ yaffs_release_temp_buffer(dev, (u8 *) buffer); ++ return retval; ++} ++ ++int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR * name, ++ const void *value, int size, int flags) ++{ ++ return yaffs_do_xattrib_mod(obj, 1, name, value, size, flags); ++} ++ ++int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR * name) ++{ ++ return yaffs_do_xattrib_mod(obj, 0, name, NULL, 0, 0); ++} ++ ++int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR * name, void *value, ++ int size) ++{ ++ return yaffs_do_xattrib_fetch(obj, name, value, size); ++} ++ ++int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size) ++{ ++ return yaffs_do_xattrib_fetch(obj, NULL, buffer, size); ++} ++ ++static void yaffs_check_obj_details_loaded(struct yaffs_obj *in) ++{ ++ u8 *buf; ++ struct yaffs_obj_hdr *oh; ++ struct yaffs_dev *dev; ++ struct yaffs_ext_tags tags; ++ int result; ++ int alloc_failed = 0; ++ ++ if (!in || !in->lazy_loaded || in->hdr_chunk < 1) ++ return; ++ ++ dev = in->my_dev; ++ in->lazy_loaded = 0; ++ buf = yaffs_get_temp_buffer(dev); ++ ++ result = yaffs_rd_chunk_tags_nand(dev, in->hdr_chunk, buf, &tags); ++ oh = (struct yaffs_obj_hdr *)buf; ++ ++ in->yst_mode = oh->yst_mode; ++ yaffs_load_attribs(in, oh); ++ yaffs_set_obj_name_from_oh(in, oh); ++ ++ if (in->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) { ++ in->variant.symlink_variant.alias = ++ yaffs_clone_str(oh->alias); ++ if (!in->variant.symlink_variant.alias) ++ alloc_failed = 1; /* Not returned */ ++ } ++ yaffs_release_temp_buffer(dev, buf); ++} ++ ++static void yaffs_load_name_from_oh(struct yaffs_dev *dev, YCHAR *name, ++ const YCHAR *oh_name, int buff_size) ++{ ++#ifdef CONFIG_YAFFS_AUTO_UNICODE ++ if (dev->param.auto_unicode) { ++ if (*oh_name) { ++ /* It is an ASCII name, do an ASCII to ++ * unicode conversion */ ++ const char *ascii_oh_name = (const char *)oh_name; ++ int n = buff_size - 1; ++ while (n > 0 && *ascii_oh_name) { ++ *name = *ascii_oh_name; ++ name++; ++ ascii_oh_name++; ++ n--; ++ } ++ } else { ++ strncpy(name, oh_name + 1, buff_size - 1); ++ } ++ } else { ++#else ++ (void) dev; ++ { ++#endif ++ strncpy(name, oh_name, buff_size - 1); ++ } ++} ++ ++static void yaffs_load_oh_from_name(struct yaffs_dev *dev, YCHAR *oh_name, ++ const YCHAR *name) ++{ ++#ifdef CONFIG_YAFFS_AUTO_UNICODE ++ ++ int is_ascii; ++ YCHAR *w; ++ ++ if (dev->param.auto_unicode) { ++ ++ is_ascii = 1; ++ w = name; ++ ++ /* Figure out if the name will fit in ascii character set */ ++ while (is_ascii && *w) { ++ if ((*w) & 0xff00) ++ is_ascii = 0; ++ w++; ++ } ++ ++ if (is_ascii) { ++ /* It is an ASCII name, so convert unicode to ascii */ ++ char *ascii_oh_name = (char *)oh_name; ++ int n = YAFFS_MAX_NAME_LENGTH - 1; ++ while (n > 0 && *name) { ++ *ascii_oh_name = *name; ++ name++; ++ ascii_oh_name++; ++ n--; ++ } ++ } else { ++ /* Unicode name, so save starting at the second YCHAR */ ++ *oh_name = 0; ++ strncpy(oh_name + 1, name, YAFFS_MAX_NAME_LENGTH - 2); ++ } ++ } else { ++#else ++ dev = dev; ++ { ++#endif ++ strncpy(oh_name, name, YAFFS_MAX_NAME_LENGTH - 1); ++ } ++} ++ ++/* UpdateObjectHeader updates the header on NAND for an object. ++ * If name is not NULL, then that new name is used. ++ */ ++int yaffs_update_oh(struct yaffs_obj *in, const YCHAR *name, int force, ++ int is_shrink, int shadows, struct yaffs_xattr_mod *xmod) ++{ ++ ++ struct yaffs_block_info *bi; ++ struct yaffs_dev *dev = in->my_dev; ++ int prev_chunk_id; ++ int ret_val = 0; ++ int result = 0; ++ int new_chunk_id; ++ struct yaffs_ext_tags new_tags; ++ struct yaffs_ext_tags old_tags; ++ const YCHAR *alias = NULL; ++ u8 *buffer = NULL; ++ YCHAR old_name[YAFFS_MAX_NAME_LENGTH + 1]; ++ struct yaffs_obj_hdr *oh = NULL; ++ loff_t file_size = 0; ++ ++ strcpy(old_name, _Y("silly old name")); ++ ++ if (in->fake && in != dev->root_dir && !force && !xmod) ++ return ret_val; ++ ++ yaffs_check_gc(dev, 0); ++ yaffs_check_obj_details_loaded(in); ++ ++ buffer = yaffs_get_temp_buffer(in->my_dev); ++ oh = (struct yaffs_obj_hdr *)buffer; ++ ++ prev_chunk_id = in->hdr_chunk; ++ ++ if (prev_chunk_id > 0) { ++ result = yaffs_rd_chunk_tags_nand(dev, prev_chunk_id, ++ buffer, &old_tags); ++ ++ yaffs_verify_oh(in, oh, &old_tags, 0); ++ memcpy(old_name, oh->name, sizeof(oh->name)); ++ memset(buffer, 0xff, sizeof(struct yaffs_obj_hdr)); ++ } else { ++ memset(buffer, 0xff, dev->data_bytes_per_chunk); ++ } ++ ++ oh->type = in->variant_type; ++ oh->yst_mode = in->yst_mode; ++ oh->shadows_obj = oh->inband_shadowed_obj_id = shadows; ++ ++ yaffs_load_attribs_oh(oh, in); ++ ++ if (in->parent) ++ oh->parent_obj_id = in->parent->obj_id; ++ else ++ oh->parent_obj_id = 0; ++ ++ if (name && *name) { ++ memset(oh->name, 0, sizeof(oh->name)); ++ yaffs_load_oh_from_name(dev, oh->name, name); ++ } else if (prev_chunk_id > 0) { ++ memcpy(oh->name, old_name, sizeof(oh->name)); ++ } else { ++ memset(oh->name, 0, sizeof(oh->name)); ++ } ++ ++ oh->is_shrink = is_shrink; ++ ++ switch (in->variant_type) { ++ case YAFFS_OBJECT_TYPE_UNKNOWN: ++ /* Should not happen */ ++ break; ++ case YAFFS_OBJECT_TYPE_FILE: ++ if (oh->parent_obj_id != YAFFS_OBJECTID_DELETED && ++ oh->parent_obj_id != YAFFS_OBJECTID_UNLINKED) ++ file_size = in->variant.file_variant.file_size; ++ yaffs_oh_size_load(oh, file_size); ++ break; ++ case YAFFS_OBJECT_TYPE_HARDLINK: ++ oh->equiv_id = in->variant.hardlink_variant.equiv_id; ++ break; ++ case YAFFS_OBJECT_TYPE_SPECIAL: ++ /* Do nothing */ ++ break; ++ case YAFFS_OBJECT_TYPE_DIRECTORY: ++ /* Do nothing */ ++ break; ++ case YAFFS_OBJECT_TYPE_SYMLINK: ++ alias = in->variant.symlink_variant.alias; ++ if (!alias) ++ alias = _Y("no alias"); ++ strncpy(oh->alias, alias, YAFFS_MAX_ALIAS_LENGTH); ++ oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0; ++ break; ++ } ++ ++ /* process any xattrib modifications */ ++ if (xmod) ++ yaffs_apply_xattrib_mod(in, (char *)buffer, xmod); ++ ++ /* Tags */ ++ memset(&new_tags, 0, sizeof(new_tags)); ++ in->serial++; ++ new_tags.chunk_id = 0; ++ new_tags.obj_id = in->obj_id; ++ new_tags.serial_number = in->serial; ++ ++ /* Add extra info for file header */ ++ new_tags.extra_available = 1; ++ new_tags.extra_parent_id = oh->parent_obj_id; ++ new_tags.extra_file_size = file_size; ++ new_tags.extra_is_shrink = oh->is_shrink; ++ new_tags.extra_equiv_id = oh->equiv_id; ++ new_tags.extra_shadows = (oh->shadows_obj > 0) ? 1 : 0; ++ new_tags.extra_obj_type = in->variant_type; ++ yaffs_verify_oh(in, oh, &new_tags, 1); ++ ++ /* Create new chunk in NAND */ ++ new_chunk_id = ++ yaffs_write_new_chunk(dev, buffer, &new_tags, ++ (prev_chunk_id > 0) ? 1 : 0); ++ ++ if (buffer) ++ yaffs_release_temp_buffer(dev, buffer); ++ ++ if (new_chunk_id < 0) ++ return new_chunk_id; ++ ++ in->hdr_chunk = new_chunk_id; ++ ++ if (prev_chunk_id > 0) ++ yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__); ++ ++ if (!yaffs_obj_cache_dirty(in)) ++ in->dirty = 0; ++ ++ /* If this was a shrink, then mark the block ++ * that the chunk lives on */ ++ if (is_shrink) { ++ bi = yaffs_get_block_info(in->my_dev, ++ new_chunk_id / ++ in->my_dev->param.chunks_per_block); ++ bi->has_shrink_hdr = 1; ++ } ++ ++ ++ return new_chunk_id; ++} ++ ++/*--------------------- File read/write ------------------------ ++ * Read and write have very similar structures. ++ * In general the read/write has three parts to it ++ * An incomplete chunk to start with (if the read/write is not chunk-aligned) ++ * Some complete chunks ++ * An incomplete chunk to end off with ++ * ++ * Curve-balls: the first chunk might also be the last chunk. ++ */ ++ ++int yaffs_file_rd(struct yaffs_obj *in, u8 * buffer, loff_t offset, int n_bytes) ++{ ++ int chunk; ++ u32 start; ++ int n_copy; ++ int n = n_bytes; ++ int n_done = 0; ++ struct yaffs_cache *cache; ++ struct yaffs_dev *dev; ++ ++ dev = in->my_dev; ++ ++ while (n > 0) { ++ yaffs_addr_to_chunk(dev, offset, &chunk, &start); ++ chunk++; ++ ++ /* OK now check for the curveball where the start and end are in ++ * the same chunk. ++ */ ++ if ((start + n) < dev->data_bytes_per_chunk) ++ n_copy = n; ++ else ++ n_copy = dev->data_bytes_per_chunk - start; ++ ++ cache = yaffs_find_chunk_cache(in, chunk); ++ ++ /* If the chunk is already in the cache or it is less than ++ * a whole chunk or we're using inband tags then use the cache ++ * (if there is caching) else bypass the cache. ++ */ ++ if (cache || n_copy != dev->data_bytes_per_chunk || ++ dev->param.inband_tags) { ++ if (dev->param.n_caches > 0) { ++ ++ /* If we can't find the data in the cache, ++ * then load it up. */ ++ ++ if (!cache) { ++ cache = ++ yaffs_grab_chunk_cache(in->my_dev); ++ cache->object = in; ++ cache->chunk_id = chunk; ++ cache->dirty = 0; ++ cache->locked = 0; ++ yaffs_rd_data_obj(in, chunk, ++ cache->data); ++ cache->n_bytes = 0; ++ } ++ ++ yaffs_use_cache(dev, cache, 0); ++ ++ cache->locked = 1; ++ ++ memcpy(buffer, &cache->data[start], n_copy); ++ ++ cache->locked = 0; ++ } else { ++ /* Read into the local buffer then copy.. */ ++ ++ u8 *local_buffer = ++ yaffs_get_temp_buffer(dev); ++ yaffs_rd_data_obj(in, chunk, local_buffer); ++ ++ memcpy(buffer, &local_buffer[start], n_copy); ++ ++ yaffs_release_temp_buffer(dev, local_buffer); ++ } ++ } else { ++ /* A full chunk. Read directly into the buffer. */ ++ yaffs_rd_data_obj(in, chunk, buffer); ++ } ++ n -= n_copy; ++ offset += n_copy; ++ buffer += n_copy; ++ n_done += n_copy; ++ } ++ return n_done; ++} ++ ++int yaffs_do_file_wr(struct yaffs_obj *in, const u8 *buffer, loff_t offset, ++ int n_bytes, int write_through) ++{ ++ ++ int chunk; ++ u32 start; ++ int n_copy; ++ int n = n_bytes; ++ int n_done = 0; ++ int n_writeback; ++ loff_t start_write = offset; ++ int chunk_written = 0; ++ u32 n_bytes_read; ++ loff_t chunk_start; ++ struct yaffs_dev *dev; ++ ++ dev = in->my_dev; ++ ++ while (n > 0 && chunk_written >= 0) { ++ yaffs_addr_to_chunk(dev, offset, &chunk, &start); ++ ++ if (((loff_t)chunk) * ++ dev->data_bytes_per_chunk + start != offset || ++ start >= dev->data_bytes_per_chunk) { ++ yaffs_trace(YAFFS_TRACE_ERROR, ++ "AddrToChunk of offset %lld gives chunk %d start %d", ++ offset, chunk, start); ++ } ++ chunk++; /* File pos to chunk in file offset */ ++ ++ /* OK now check for the curveball where the start and end are in ++ * the same chunk. ++ */ ++ ++ if ((start + n) < dev->data_bytes_per_chunk) { ++ n_copy = n; ++ ++ /* Now calculate how many bytes to write back.... ++ * If we're overwriting and not writing to then end of ++ * file then we need to write back as much as was there ++ * before. ++ */ ++ ++ chunk_start = (((loff_t)(chunk - 1)) * ++ dev->data_bytes_per_chunk); ++ ++ if (chunk_start > in->variant.file_variant.file_size) ++ n_bytes_read = 0; /* Past end of file */ ++ else ++ n_bytes_read = ++ in->variant.file_variant.file_size - ++ chunk_start; ++ ++ if (n_bytes_read > dev->data_bytes_per_chunk) ++ n_bytes_read = dev->data_bytes_per_chunk; ++ ++ n_writeback = ++ (n_bytes_read > ++ (start + n)) ? n_bytes_read : (start + n); ++ ++ if (n_writeback < 0 || ++ n_writeback > dev->data_bytes_per_chunk) ++ BUG(); ++ ++ } else { ++ n_copy = dev->data_bytes_per_chunk - start; ++ n_writeback = dev->data_bytes_per_chunk; ++ } ++ ++ if (n_copy != dev->data_bytes_per_chunk || ++ !dev->param.cache_bypass_aligned || ++ dev->param.inband_tags) { ++ /* An incomplete start or end chunk (or maybe both ++ * start and end chunk), or we're using inband tags, ++ * or we're forcing writes through the cache, ++ * so we want to use the cache buffers. ++ */ ++ if (dev->param.n_caches > 0) { ++ struct yaffs_cache *cache; ++ ++ /* If we can't find the data in the cache, then ++ * load the cache */ ++ cache = yaffs_find_chunk_cache(in, chunk); ++ ++ if (!cache && ++ yaffs_check_alloc_available(dev, 1)) { ++ cache = yaffs_grab_chunk_cache(dev); ++ cache->object = in; ++ cache->chunk_id = chunk; ++ cache->dirty = 0; ++ cache->locked = 0; ++ yaffs_rd_data_obj(in, chunk, ++ cache->data); ++ } else if (cache && ++ !cache->dirty && ++ !yaffs_check_alloc_available(dev, ++ 1)) { ++ /* Drop the cache if it was a read cache ++ * item and no space check has been made ++ * for it. ++ */ ++ cache = NULL; ++ } ++ ++ if (cache) { ++ yaffs_use_cache(dev, cache, 1); ++ cache->locked = 1; ++ ++ memcpy(&cache->data[start], buffer, ++ n_copy); ++ ++ cache->locked = 0; ++ cache->n_bytes = n_writeback; ++ ++ if (write_through) { ++ chunk_written = ++ yaffs_wr_data_obj ++ (cache->object, ++ cache->chunk_id, ++ cache->data, ++ cache->n_bytes, 1); ++ cache->dirty = 0; ++ } ++ } else { ++ chunk_written = -1; /* fail write */ ++ } ++ } else { ++ /* An incomplete start or end chunk (or maybe ++ * both start and end chunk). Read into the ++ * local buffer then copy over and write back. ++ */ ++ ++ u8 *local_buffer = yaffs_get_temp_buffer(dev); ++ ++ yaffs_rd_data_obj(in, chunk, local_buffer); ++ memcpy(&local_buffer[start], buffer, n_copy); ++ ++ chunk_written = ++ yaffs_wr_data_obj(in, chunk, ++ local_buffer, ++ n_writeback, 0); ++ ++ yaffs_release_temp_buffer(dev, local_buffer); ++ } ++ } else { ++ /* A full chunk. Write directly from the buffer. */ ++ ++ chunk_written = ++ yaffs_wr_data_obj(in, chunk, buffer, ++ dev->data_bytes_per_chunk, 0); ++ ++ /* Since we've overwritten the cached data, ++ * we better invalidate it. */ ++ yaffs_invalidate_chunk_cache(in, chunk); ++ } ++ ++ if (chunk_written >= 0) { ++ n -= n_copy; ++ offset += n_copy; ++ buffer += n_copy; ++ n_done += n_copy; ++ } ++ } ++ ++ /* Update file object */ ++ ++ if ((start_write + n_done) > in->variant.file_variant.file_size) ++ in->variant.file_variant.file_size = (start_write + n_done); ++ ++ in->dirty = 1; ++ return n_done; ++} ++ ++int yaffs_wr_file(struct yaffs_obj *in, const u8 *buffer, loff_t offset, ++ int n_bytes, int write_through) ++{ ++ yaffs2_handle_hole(in, offset); ++ return yaffs_do_file_wr(in, buffer, offset, n_bytes, write_through); ++} ++ ++/* ---------------------- File resizing stuff ------------------ */ ++ ++static void yaffs_prune_chunks(struct yaffs_obj *in, loff_t new_size) ++{ ++ ++ struct yaffs_dev *dev = in->my_dev; ++ loff_t old_size = in->variant.file_variant.file_size; ++ int i; ++ int chunk_id; ++ u32 dummy; ++ int last_del; ++ int start_del; ++ ++ if (old_size > 0) ++ yaffs_addr_to_chunk(dev, old_size - 1, &last_del, &dummy); ++ else ++ last_del = 0; ++ ++ yaffs_addr_to_chunk(dev, new_size + dev->data_bytes_per_chunk - 1, ++ &start_del, &dummy); ++ last_del++; ++ start_del++; ++ ++ /* Delete backwards so that we don't end up with holes if ++ * power is lost part-way through the operation. ++ */ ++ for (i = last_del; i >= start_del; i--) { ++ /* NB this could be optimised somewhat, ++ * eg. could retrieve the tags and write them without ++ * using yaffs_chunk_del ++ */ ++ ++ chunk_id = yaffs_find_del_file_chunk(in, i, NULL); ++ ++ if (chunk_id < 1) ++ continue; ++ ++ if (chunk_id < ++ (dev->internal_start_block * dev->param.chunks_per_block) || ++ chunk_id >= ++ ((dev->internal_end_block + 1) * ++ dev->param.chunks_per_block)) { ++ yaffs_trace(YAFFS_TRACE_ALWAYS, ++ "Found daft chunk_id %d for %d", ++ chunk_id, i); ++ } else { ++ in->n_data_chunks--; ++ yaffs_chunk_del(dev, chunk_id, 1, __LINE__); ++ } ++ } ++} ++ ++void yaffs_resize_file_down(struct yaffs_obj *obj, loff_t new_size) ++{ ++ int new_full; ++ u32 new_partial; ++ struct yaffs_dev *dev = obj->my_dev; ++ ++ yaffs_addr_to_chunk(dev, new_size, &new_full, &new_partial); ++ ++ yaffs_prune_chunks(obj, new_size); ++ ++ if (new_partial != 0) { ++ int last_chunk = 1 + new_full; ++ u8 *local_buffer = yaffs_get_temp_buffer(dev); ++ ++ /* Rewrite the last chunk with its new size and zero pad */ ++ yaffs_rd_data_obj(obj, last_chunk, local_buffer); ++ memset(local_buffer + new_partial, 0, ++ dev->data_bytes_per_chunk - new_partial); ++ ++ yaffs_wr_data_obj(obj, last_chunk, local_buffer, ++ new_partial, 1); ++ ++ yaffs_release_temp_buffer(dev, local_buffer); ++ } ++ ++ obj->variant.file_variant.file_size = new_size; ++ ++ yaffs_prune_tree(dev, &obj->variant.file_variant); ++} ++ ++int yaffs_resize_file(struct yaffs_obj *in, loff_t new_size) ++{ ++ struct yaffs_dev *dev = in->my_dev; ++ loff_t old_size = in->variant.file_variant.file_size; ++ ++ yaffs_flush_file_cache(in); ++ yaffs_invalidate_whole_cache(in); ++ ++ yaffs_check_gc(dev, 0); ++ ++ if (in->variant_type != YAFFS_OBJECT_TYPE_FILE) ++ return YAFFS_FAIL; ++ ++ if (new_size == old_size) ++ return YAFFS_OK; ++ ++ if (new_size > old_size) { ++ yaffs2_handle_hole(in, new_size); ++ in->variant.file_variant.file_size = new_size; ++ } else { ++ /* new_size < old_size */ ++ yaffs_resize_file_down(in, new_size); ++ } ++ ++ /* Write a new object header to reflect the resize. ++ * show we've shrunk the file, if need be ++ * Do this only if the file is not in the deleted directories ++ * and is not shadowed. ++ */ ++ if (in->parent && ++ !in->is_shadowed && ++ in->parent->obj_id != YAFFS_OBJECTID_UNLINKED && ++ in->parent->obj_id != YAFFS_OBJECTID_DELETED) ++ yaffs_update_oh(in, NULL, 0, 0, 0, NULL); ++ ++ return YAFFS_OK; ++} ++ ++int yaffs_flush_file(struct yaffs_obj *in, int update_time, int data_sync) ++{ ++ if (!in->dirty) ++ return YAFFS_OK; ++ ++ yaffs_flush_file_cache(in); ++ ++ if (data_sync) ++ return YAFFS_OK; ++ ++ if (update_time) ++ yaffs_load_current_time(in, 0, 0); ++ ++ return (yaffs_update_oh(in, NULL, 0, 0, 0, NULL) >= 0) ? ++ YAFFS_OK : YAFFS_FAIL; ++} ++ ++ ++/* yaffs_del_file deletes the whole file data ++ * and the inode associated with the file. ++ * It does not delete the links associated with the file. ++ */ ++static int yaffs_unlink_file_if_needed(struct yaffs_obj *in) ++{ ++ int ret_val; ++ int del_now = 0; ++ struct yaffs_dev *dev = in->my_dev; ++ ++ if (!in->my_inode) ++ del_now = 1; ++ ++ if (del_now) { ++ ret_val = ++ yaffs_change_obj_name(in, in->my_dev->del_dir, ++ _Y("deleted"), 0, 0); ++ yaffs_trace(YAFFS_TRACE_TRACING, ++ "yaffs: immediate deletion of file %d", ++ in->obj_id); ++ in->deleted = 1; ++ in->my_dev->n_deleted_files++; ++ if (dev->param.disable_soft_del || dev->param.is_yaffs2) ++ yaffs_resize_file(in, 0); ++ yaffs_soft_del_file(in); ++ } else { ++ ret_val = ++ yaffs_change_obj_name(in, in->my_dev->unlinked_dir, ++ _Y("unlinked"), 0, 0); ++ } ++ return ret_val; ++} ++ ++static int yaffs_del_file(struct yaffs_obj *in) ++{ ++ int ret_val = YAFFS_OK; ++ int deleted; /* Need to cache value on stack if in is freed */ ++ struct yaffs_dev *dev = in->my_dev; ++ ++ if (dev->param.disable_soft_del || dev->param.is_yaffs2) ++ yaffs_resize_file(in, 0); ++ ++ if (in->n_data_chunks > 0) { ++ /* Use soft deletion if there is data in the file. ++ * That won't be the case if it has been resized to zero. ++ */ ++ if (!in->unlinked) ++ ret_val = yaffs_unlink_file_if_needed(in); ++ ++ deleted = in->deleted; ++ ++ if (ret_val == YAFFS_OK && in->unlinked && !in->deleted) { ++ in->deleted = 1; ++ deleted = 1; ++ in->my_dev->n_deleted_files++; ++ yaffs_soft_del_file(in); ++ } ++ return deleted ? YAFFS_OK : YAFFS_FAIL; ++ } else { ++ /* The file has no data chunks so we toss it immediately */ ++ yaffs_free_tnode(in->my_dev, in->variant.file_variant.top); ++ in->variant.file_variant.top = NULL; ++ yaffs_generic_obj_del(in); ++ ++ return YAFFS_OK; ++ } ++} ++ ++int yaffs_is_non_empty_dir(struct yaffs_obj *obj) ++{ ++ return (obj && ++ obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) && ++ !(list_empty(&obj->variant.dir_variant.children)); ++} ++ ++static int yaffs_del_dir(struct yaffs_obj *obj) ++{ ++ /* First check that the directory is empty. */ ++ if (yaffs_is_non_empty_dir(obj)) ++ return YAFFS_FAIL; ++ ++ return yaffs_generic_obj_del(obj); ++} ++ ++static int yaffs_del_symlink(struct yaffs_obj *in) ++{ ++ kfree(in->variant.symlink_variant.alias); ++ in->variant.symlink_variant.alias = NULL; ++ ++ return yaffs_generic_obj_del(in); ++} ++ ++static int yaffs_del_link(struct yaffs_obj *in) ++{ ++ /* remove this hardlink from the list associated with the equivalent ++ * object ++ */ ++ list_del_init(&in->hard_links); ++ return yaffs_generic_obj_del(in); ++} ++ ++int yaffs_del_obj(struct yaffs_obj *obj) ++{ ++ int ret_val = -1; ++ ++ switch (obj->variant_type) { ++ case YAFFS_OBJECT_TYPE_FILE: ++ ret_val = yaffs_del_file(obj); ++ break; ++ case YAFFS_OBJECT_TYPE_DIRECTORY: ++ if (!list_empty(&obj->variant.dir_variant.dirty)) { ++ yaffs_trace(YAFFS_TRACE_BACKGROUND, ++ "Remove object %d from dirty directories", ++ obj->obj_id); ++ list_del_init(&obj->variant.dir_variant.dirty); ++ } ++ return yaffs_del_dir(obj); ++ break; ++ case YAFFS_OBJECT_TYPE_SYMLINK: ++ ret_val = yaffs_del_symlink(obj); ++ break; ++ case YAFFS_OBJECT_TYPE_HARDLINK: ++ ret_val = yaffs_del_link(obj); ++ break; ++ case YAFFS_OBJECT_TYPE_SPECIAL: ++ ret_val = yaffs_generic_obj_del(obj); ++ break; ++ case YAFFS_OBJECT_TYPE_UNKNOWN: ++ ret_val = 0; ++ break; /* should not happen. */ ++ } ++ return ret_val; ++} ++ ++ ++static void yaffs_empty_dir_to_dir(struct yaffs_obj *from_dir, ++ struct yaffs_obj *to_dir) ++{ ++ struct yaffs_obj *obj; ++ struct list_head *lh; ++ struct list_head *n; ++ ++ list_for_each_safe(lh, n, &from_dir->variant.dir_variant.children) { ++ obj = list_entry(lh, struct yaffs_obj, siblings); ++ yaffs_add_obj_to_dir(to_dir, obj); ++ } ++} ++ ++struct yaffs_obj *yaffs_retype_obj(struct yaffs_obj *obj, ++ enum yaffs_obj_type type) ++{ ++ /* Tear down the old variant */ ++ switch (obj->variant_type) { ++ case YAFFS_OBJECT_TYPE_FILE: ++ /* Nuke file data */ ++ yaffs_resize_file(obj, 0); ++ yaffs_free_tnode(obj->my_dev, obj->variant.file_variant.top); ++ obj->variant.file_variant.top = NULL; ++ break; ++ case YAFFS_OBJECT_TYPE_DIRECTORY: ++ /* Put the children in lost and found. */ ++ yaffs_empty_dir_to_dir(obj, obj->my_dev->lost_n_found); ++ if (!list_empty(&obj->variant.dir_variant.dirty)) ++ list_del_init(&obj->variant.dir_variant.dirty); ++ break; ++ case YAFFS_OBJECT_TYPE_SYMLINK: ++ /* Nuke symplink data */ ++ kfree(obj->variant.symlink_variant.alias); ++ obj->variant.symlink_variant.alias = NULL; ++ break; ++ case YAFFS_OBJECT_TYPE_HARDLINK: ++ list_del_init(&obj->hard_links); ++ break; ++ default: ++ break; ++ } ++ ++ memset(&obj->variant, 0, sizeof(obj->variant)); ++ ++ /*Set up new variant if the memset is not enough. */ ++ switch (type) { ++ case YAFFS_OBJECT_TYPE_DIRECTORY: ++ INIT_LIST_HEAD(&obj->variant.dir_variant.children); ++ INIT_LIST_HEAD(&obj->variant.dir_variant.dirty); ++ break; ++ case YAFFS_OBJECT_TYPE_FILE: ++ case YAFFS_OBJECT_TYPE_SYMLINK: ++ case YAFFS_OBJECT_TYPE_HARDLINK: ++ default: ++ break; ++ } ++ ++ obj->variant_type = type; ++ ++ return obj; ++ ++} ++ ++static int yaffs_unlink_worker(struct yaffs_obj *obj) ++{ ++ int del_now = 0; ++ ++ if (!obj) ++ return YAFFS_FAIL; ++ ++ if (!obj->my_inode) ++ del_now = 1; ++ ++ yaffs_update_parent(obj->parent); ++ ++ if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) { ++ return yaffs_del_link(obj); ++ } else if (!list_empty(&obj->hard_links)) { ++ /* Curve ball: We're unlinking an object that has a hardlink. ++ * ++ * This problem arises because we are not strictly following ++ * The Linux link/inode model. ++ * ++ * We can't really delete the object. ++ * Instead, we do the following: ++ * - Select a hardlink. ++ * - Unhook it from the hard links ++ * - Move it from its parent directory so that the rename works. ++ * - Rename the object to the hardlink's name. ++ * - Delete the hardlink ++ */ ++ ++ struct yaffs_obj *hl; ++ struct yaffs_obj *parent; ++ int ret_val; ++ YCHAR name[YAFFS_MAX_NAME_LENGTH + 1]; ++ ++ hl = list_entry(obj->hard_links.next, struct yaffs_obj, ++ hard_links); ++ ++ yaffs_get_obj_name(hl, name, YAFFS_MAX_NAME_LENGTH + 1); ++ parent = hl->parent; ++ ++ list_del_init(&hl->hard_links); ++ ++ yaffs_add_obj_to_dir(obj->my_dev->unlinked_dir, hl); ++ ++ ret_val = yaffs_change_obj_name(obj, parent, name, 0, 0); ++ ++ if (ret_val == YAFFS_OK) ++ ret_val = yaffs_generic_obj_del(hl); ++ ++ return ret_val; ++ ++ } else if (del_now) { ++ switch (obj->variant_type) { ++ case YAFFS_OBJECT_TYPE_FILE: ++ return yaffs_del_file(obj); ++ break; ++ case YAFFS_OBJECT_TYPE_DIRECTORY: ++ list_del_init(&obj->variant.dir_variant.dirty); ++ return yaffs_del_dir(obj); ++ break; ++ case YAFFS_OBJECT_TYPE_SYMLINK: ++ return yaffs_del_symlink(obj); ++ break; ++ case YAFFS_OBJECT_TYPE_SPECIAL: ++ return yaffs_generic_obj_del(obj); ++ break; ++ case YAFFS_OBJECT_TYPE_HARDLINK: ++ case YAFFS_OBJECT_TYPE_UNKNOWN: ++ default: ++ return YAFFS_FAIL; ++ } ++ } else if (yaffs_is_non_empty_dir(obj)) { ++ return YAFFS_FAIL; ++ } else { ++ return yaffs_change_obj_name(obj, obj->my_dev->unlinked_dir, ++ _Y("unlinked"), 0, 0); ++ } ++} ++ ++static int yaffs_unlink_obj(struct yaffs_obj *obj) ++{ ++ if (obj && obj->unlink_allowed) ++ return yaffs_unlink_worker(obj); ++ ++ return YAFFS_FAIL; ++} ++ ++int yaffs_unlinker(struct yaffs_obj *dir, const YCHAR *name) ++{ ++ struct yaffs_obj *obj; ++ ++ obj = yaffs_find_by_name(dir, name); ++ return yaffs_unlink_obj(obj); ++} ++ ++/* Note: ++ * If old_name is NULL then we take old_dir as the object to be renamed. ++ */ ++int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR *old_name, ++ struct yaffs_obj *new_dir, const YCHAR *new_name) ++{ ++ struct yaffs_obj *obj = NULL; ++ struct yaffs_obj *existing_target = NULL; ++ int force = 0; ++ int result; ++ struct yaffs_dev *dev; ++ ++ if (!old_dir || old_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) { ++ BUG(); ++ return YAFFS_FAIL; ++ } ++ if (!new_dir || new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) { ++ BUG(); ++ return YAFFS_FAIL; ++ } ++ ++ dev = old_dir->my_dev; ++ ++#ifdef CONFIG_YAFFS_CASE_INSENSITIVE ++ /* Special case for case insemsitive systems. ++ * While look-up is case insensitive, the name isn't. ++ * Therefore we might want to change x.txt to X.txt ++ */ ++ if (old_dir == new_dir && ++ old_name && new_name && ++ strcmp(old_name, new_name) == 0) ++ force = 1; ++#endif ++ ++ if (strnlen(new_name, YAFFS_MAX_NAME_LENGTH + 1) > ++ YAFFS_MAX_NAME_LENGTH) ++ /* ENAMETOOLONG */ ++ return YAFFS_FAIL; ++ ++ if (old_name) ++ obj = yaffs_find_by_name(old_dir, old_name); ++ else{ ++ obj = old_dir; ++ old_dir = obj->parent; ++ } ++ ++ if (obj && obj->rename_allowed) { ++ /* Now handle an existing target, if there is one */ ++ existing_target = yaffs_find_by_name(new_dir, new_name); ++ if (yaffs_is_non_empty_dir(existing_target)) { ++ return YAFFS_FAIL; /* ENOTEMPTY */ ++ } else if (existing_target && existing_target != obj) { ++ /* Nuke the target first, using shadowing, ++ * but only if it isn't the same object. ++ * ++ * Note we must disable gc here otherwise it can mess ++ * up the shadowing. ++ * ++ */ ++ dev->gc_disable = 1; ++ yaffs_change_obj_name(obj, new_dir, new_name, force, ++ existing_target->obj_id); ++ existing_target->is_shadowed = 1; ++ yaffs_unlink_obj(existing_target); ++ dev->gc_disable = 0; ++ } ++ ++ result = yaffs_change_obj_name(obj, new_dir, new_name, 1, 0); ++ ++ yaffs_update_parent(old_dir); ++ if (new_dir != old_dir) ++ yaffs_update_parent(new_dir); ++ ++ return result; ++ } ++ return YAFFS_FAIL; ++} ++ ++/*----------------------- Initialisation Scanning ---------------------- */ ++ ++void yaffs_handle_shadowed_obj(struct yaffs_dev *dev, int obj_id, ++ int backward_scanning) ++{ ++ struct yaffs_obj *obj; ++ ++ if (backward_scanning) { ++ /* Handle YAFFS2 case (backward scanning) ++ * If the shadowed object exists then ignore. ++ */ ++ obj = yaffs_find_by_number(dev, obj_id); ++ if (obj) ++ return; ++ } ++ ++ /* Let's create it (if it does not exist) assuming it is a file so that ++ * it can do shrinking etc. ++ * We put it in unlinked dir to be cleaned up after the scanning ++ */ ++ obj = ++ yaffs_find_or_create_by_number(dev, obj_id, YAFFS_OBJECT_TYPE_FILE); ++ if (!obj) ++ return; ++ obj->is_shadowed = 1; ++ yaffs_add_obj_to_dir(dev->unlinked_dir, obj); ++ obj->variant.file_variant.shrink_size = 0; ++ obj->valid = 1; /* So that we don't read any other info. */ ++} ++ ++void yaffs_link_fixup(struct yaffs_dev *dev, struct list_head *hard_list) ++{ ++ struct list_head *lh; ++ struct list_head *save; ++ struct yaffs_obj *hl; ++ struct yaffs_obj *in; ++ ++ list_for_each_safe(lh, save, hard_list) { ++ hl = list_entry(lh, struct yaffs_obj, hard_links); ++ in = yaffs_find_by_number(dev, ++ hl->variant.hardlink_variant.equiv_id); ++ ++ if (in) { ++ /* Add the hardlink pointers */ ++ hl->variant.hardlink_variant.equiv_obj = in; ++ list_add(&hl->hard_links, &in->hard_links); ++ } else { ++ /* Todo Need to report/handle this better. ++ * Got a problem... hardlink to a non-existant object ++ */ ++ hl->variant.hardlink_variant.equiv_obj = NULL; ++ INIT_LIST_HEAD(&hl->hard_links); ++ } ++ } ++} ++ ++static void yaffs_strip_deleted_objs(struct yaffs_dev *dev) ++{ ++ /* ++ * Sort out state of unlinked and deleted objects after scanning. ++ */ ++ struct list_head *i; ++ struct list_head *n; ++ struct yaffs_obj *l; ++ ++ if (dev->read_only) ++ return; ++ ++ /* Soft delete all the unlinked files */ ++ list_for_each_safe(i, n, ++ &dev->unlinked_dir->variant.dir_variant.children) { ++ l = list_entry(i, struct yaffs_obj, siblings); ++ yaffs_del_obj(l); ++ } ++ ++ list_for_each_safe(i, n, &dev->del_dir->variant.dir_variant.children) { ++ l = list_entry(i, struct yaffs_obj, siblings); ++ yaffs_del_obj(l); ++ } ++} ++ ++/* ++ * This code iterates through all the objects making sure that they are rooted. ++ * Any unrooted objects are re-rooted in lost+found. ++ * An object needs to be in one of: ++ * - Directly under deleted, unlinked ++ * - Directly or indirectly under root. ++ * ++ * Note: ++ * This code assumes that we don't ever change the current relationships ++ * between directories: ++ * root_dir->parent == unlinked_dir->parent == del_dir->parent == NULL ++ * lost-n-found->parent == root_dir ++ * ++ * This fixes the problem where directories might have inadvertently been ++ * deleted leaving the object "hanging" without being rooted in the ++ * directory tree. ++ */ ++ ++static int yaffs_has_null_parent(struct yaffs_dev *dev, struct yaffs_obj *obj) ++{ ++ return (obj == dev->del_dir || ++ obj == dev->unlinked_dir || obj == dev->root_dir); ++} ++ ++static void yaffs_fix_hanging_objs(struct yaffs_dev *dev) ++{ ++ struct yaffs_obj *obj; ++ struct yaffs_obj *parent; ++ int i; ++ struct list_head *lh; ++ struct list_head *n; ++ int depth_limit; ++ int hanging; ++ ++ if (dev->read_only) ++ return; ++ ++ /* Iterate through the objects in each hash entry, ++ * looking at each object. ++ * Make sure it is rooted. ++ */ ++ ++ for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) { ++ list_for_each_safe(lh, n, &dev->obj_bucket[i].list) { ++ obj = list_entry(lh, struct yaffs_obj, hash_link); ++ parent = obj->parent; ++ ++ if (yaffs_has_null_parent(dev, obj)) { ++ /* These directories are not hanging */ ++ hanging = 0; ++ } else if (!parent || ++ parent->variant_type != ++ YAFFS_OBJECT_TYPE_DIRECTORY) { ++ hanging = 1; ++ } else if (yaffs_has_null_parent(dev, parent)) { ++ hanging = 0; ++ } else { ++ /* ++ * Need to follow the parent chain to ++ * see if it is hanging. ++ */ ++ hanging = 0; ++ depth_limit = 100; ++ ++ while (parent != dev->root_dir && ++ parent->parent && ++ parent->parent->variant_type == ++ YAFFS_OBJECT_TYPE_DIRECTORY && ++ depth_limit > 0) { ++ parent = parent->parent; ++ depth_limit--; ++ } ++ if (parent != dev->root_dir) ++ hanging = 1; ++ } ++ if (hanging) { ++ yaffs_trace(YAFFS_TRACE_SCAN, ++ "Hanging object %d moved to lost and found", ++ obj->obj_id); ++ yaffs_add_obj_to_dir(dev->lost_n_found, obj); ++ } ++ } ++ } ++} ++ ++/* ++ * Delete directory contents for cleaning up lost and found. ++ */ ++static void yaffs_del_dir_contents(struct yaffs_obj *dir) ++{ ++ struct yaffs_obj *obj; ++ struct list_head *lh; ++ struct list_head *n; ++ ++ if (dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) ++ BUG(); ++ ++ list_for_each_safe(lh, n, &dir->variant.dir_variant.children) { ++ obj = list_entry(lh, struct yaffs_obj, siblings); ++ if (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) ++ yaffs_del_dir_contents(obj); ++ yaffs_trace(YAFFS_TRACE_SCAN, ++ "Deleting lost_found object %d", ++ obj->obj_id); ++ yaffs_unlink_obj(obj); ++ } ++} ++ ++static void yaffs_empty_l_n_f(struct yaffs_dev *dev) ++{ ++ yaffs_del_dir_contents(dev->lost_n_found); ++} ++ ++ ++struct yaffs_obj *yaffs_find_by_name(struct yaffs_obj *directory, ++ const YCHAR *name) ++{ ++ int sum; ++ struct list_head *i; ++ YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1]; ++ struct yaffs_obj *l; ++ ++ if (!name) ++ return NULL; ++ ++ if (!directory) { ++ yaffs_trace(YAFFS_TRACE_ALWAYS, ++ "tragedy: yaffs_find_by_name: null pointer directory" ++ ); ++ BUG(); ++ return NULL; ++ } ++ if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) { ++ yaffs_trace(YAFFS_TRACE_ALWAYS, ++ "tragedy: yaffs_find_by_name: non-directory" ++ ); ++ BUG(); ++ } ++ ++ sum = yaffs_calc_name_sum(name); ++ ++ list_for_each(i, &directory->variant.dir_variant.children) { ++ l = list_entry(i, struct yaffs_obj, siblings); ++ ++ if (l->parent != directory) ++ BUG(); ++ ++ yaffs_check_obj_details_loaded(l); ++ ++ /* Special case for lost-n-found */ ++ if (l->obj_id == YAFFS_OBJECTID_LOSTNFOUND) { ++ if (!strcmp(name, YAFFS_LOSTNFOUND_NAME)) ++ return l; ++ } else if (l->sum == sum || l->hdr_chunk <= 0) { ++ /* LostnFound chunk called Objxxx ++ * Do a real check ++ */ ++ yaffs_get_obj_name(l, buffer, ++ YAFFS_MAX_NAME_LENGTH + 1); ++ if (!strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH)) ++ return l; ++ } ++ } ++ return NULL; ++} ++ ++/* GetEquivalentObject dereferences any hard links to get to the ++ * actual object. ++ */ ++ ++struct yaffs_obj *yaffs_get_equivalent_obj(struct yaffs_obj *obj) ++{ ++ if (obj && obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) { ++ obj = obj->variant.hardlink_variant.equiv_obj; ++ yaffs_check_obj_details_loaded(obj); ++ } ++ return obj; ++} ++ ++/* ++ * A note or two on object names. ++ * * If the object name is missing, we then make one up in the form objnnn ++ * ++ * * ASCII names are stored in the object header's name field from byte zero ++ * * Unicode names are historically stored starting from byte zero. ++ * ++ * Then there are automatic Unicode names... ++ * The purpose of these is to save names in a way that can be read as ++ * ASCII or Unicode names as appropriate, thus allowing a Unicode and ASCII ++ * system to share files. ++ * ++ * These automatic unicode are stored slightly differently... ++ * - If the name can fit in the ASCII character space then they are saved as ++ * ascii names as per above. ++ * - If the name needs Unicode then the name is saved in Unicode ++ * starting at oh->name[1]. ++ ++ */ ++static void yaffs_fix_null_name(struct yaffs_obj *obj, YCHAR *name, ++ int buffer_size) ++{ ++ /* Create an object name if we could not find one. */ ++ if (strnlen(name, YAFFS_MAX_NAME_LENGTH) == 0) { ++ YCHAR local_name[20]; ++ YCHAR num_string[20]; ++ YCHAR *x = &num_string[19]; ++ unsigned v = obj->obj_id; ++ num_string[19] = 0; ++ while (v > 0) { ++ x--; ++ *x = '0' + (v % 10); ++ v /= 10; ++ } ++ /* make up a name */ ++ strcpy(local_name, YAFFS_LOSTNFOUND_PREFIX); ++ strcat(local_name, x); ++ strncpy(name, local_name, buffer_size - 1); ++ } ++} ++ ++int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR *name, int buffer_size) ++{ ++ memset(name, 0, buffer_size * sizeof(YCHAR)); ++ yaffs_check_obj_details_loaded(obj); ++ if (obj->obj_id == YAFFS_OBJECTID_LOSTNFOUND) { ++ strncpy(name, YAFFS_LOSTNFOUND_NAME, buffer_size - 1); ++ } else if (obj->short_name[0]) { ++ strcpy(name, obj->short_name); ++ } else if (obj->hdr_chunk > 0) { ++ int result; ++ u8 *buffer = yaffs_get_temp_buffer(obj->my_dev); ++ ++ struct yaffs_obj_hdr *oh = (struct yaffs_obj_hdr *)buffer; ++ ++ memset(buffer, 0, obj->my_dev->data_bytes_per_chunk); ++ ++ if (obj->hdr_chunk > 0) { ++ result = yaffs_rd_chunk_tags_nand(obj->my_dev, ++ obj->hdr_chunk, ++ buffer, NULL); ++ } ++ yaffs_load_name_from_oh(obj->my_dev, name, oh->name, ++ buffer_size); ++ ++ yaffs_release_temp_buffer(obj->my_dev, buffer); ++ } ++ ++ yaffs_fix_null_name(obj, name, buffer_size); ++ ++ return strnlen(name, YAFFS_MAX_NAME_LENGTH); ++} ++ ++loff_t yaffs_get_obj_length(struct yaffs_obj *obj) ++{ ++ /* Dereference any hard linking */ ++ obj = yaffs_get_equivalent_obj(obj); ++ ++ if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE) ++ return obj->variant.file_variant.file_size; ++ if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) { ++ if (!obj->variant.symlink_variant.alias) ++ return 0; ++ return strnlen(obj->variant.symlink_variant.alias, ++ YAFFS_MAX_ALIAS_LENGTH); ++ } else { ++ /* Only a directory should drop through to here */ ++ return obj->my_dev->data_bytes_per_chunk; ++ } ++} ++ ++int yaffs_get_obj_link_count(struct yaffs_obj *obj) ++{ ++ int count = 0; ++ struct list_head *i; ++ ++ if (!obj->unlinked) ++ count++; /* the object itself */ ++ ++ list_for_each(i, &obj->hard_links) ++ count++; /* add the hard links; */ ++ ++ return count; ++} ++ ++int yaffs_get_obj_inode(struct yaffs_obj *obj) ++{ ++ obj = yaffs_get_equivalent_obj(obj); ++ ++ return obj->obj_id; ++} ++ ++unsigned yaffs_get_obj_type(struct yaffs_obj *obj) ++{ ++ obj = yaffs_get_equivalent_obj(obj); ++ ++ switch (obj->variant_type) { ++ case YAFFS_OBJECT_TYPE_FILE: ++ return DT_REG; ++ break; ++ case YAFFS_OBJECT_TYPE_DIRECTORY: ++ return DT_DIR; ++ break; ++ case YAFFS_OBJECT_TYPE_SYMLINK: ++ return DT_LNK; ++ break; ++ case YAFFS_OBJECT_TYPE_HARDLINK: ++ return DT_REG; ++ break; ++ case YAFFS_OBJECT_TYPE_SPECIAL: ++ if (S_ISFIFO(obj->yst_mode)) ++ return DT_FIFO; ++ if (S_ISCHR(obj->yst_mode)) ++ return DT_CHR; ++ if (S_ISBLK(obj->yst_mode)) ++ return DT_BLK; ++ if (S_ISSOCK(obj->yst_mode)) ++ return DT_SOCK; ++ return DT_REG; ++ break; ++ default: ++ return DT_REG; ++ break; ++ } ++} ++ ++YCHAR *yaffs_get_symlink_alias(struct yaffs_obj *obj) ++{ ++ obj = yaffs_get_equivalent_obj(obj); ++ if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) ++ return yaffs_clone_str(obj->variant.symlink_variant.alias); ++ else ++ return yaffs_clone_str(_Y("")); ++} ++ ++/*--------------------------- Initialisation code -------------------------- */ ++ ++static int yaffs_check_dev_fns(struct yaffs_dev *dev) ++{ ++ struct yaffs_driver *drv = &dev->drv; ++ struct yaffs_tags_handler *tagger = &dev->tagger; ++ ++ /* Common functions, gotta have */ ++ if (!drv->drv_read_chunk_fn || ++ !drv->drv_write_chunk_fn || ++ !drv->drv_erase_fn) ++ return 0; ++ ++ if (dev->param.is_yaffs2 && ++ (!drv->drv_mark_bad_fn || !drv->drv_check_bad_fn)) ++ return 0; ++ ++ /* Install the default tags marshalling functions if needed. */ ++ yaffs_tags_compat_install(dev); ++ yaffs_tags_marshall_install(dev); ++ ++ /* Check we now have the marshalling functions required. */ ++ if (!tagger->write_chunk_tags_fn || ++ !tagger->read_chunk_tags_fn || ++ !tagger->query_block_fn || ++ !tagger->mark_bad_fn) ++ return 0; ++ ++ return 1; ++} ++ ++static int yaffs_create_initial_dir(struct yaffs_dev *dev) ++{ ++ /* Initialise the unlinked, deleted, root and lost+found directories */ ++ dev->lost_n_found = dev->root_dir = NULL; ++ dev->unlinked_dir = dev->del_dir = NULL; ++ dev->unlinked_dir = ++ yaffs_create_fake_dir(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR); ++ dev->del_dir = ++ yaffs_create_fake_dir(dev, YAFFS_OBJECTID_DELETED, S_IFDIR); ++ dev->root_dir = ++ yaffs_create_fake_dir(dev, YAFFS_OBJECTID_ROOT, ++ YAFFS_ROOT_MODE | S_IFDIR); ++ dev->lost_n_found = ++ yaffs_create_fake_dir(dev, YAFFS_OBJECTID_LOSTNFOUND, ++ YAFFS_LOSTNFOUND_MODE | S_IFDIR); ++ ++ if (dev->lost_n_found && dev->root_dir && dev->unlinked_dir ++ && dev->del_dir) { ++ yaffs_add_obj_to_dir(dev->root_dir, dev->lost_n_found); ++ return YAFFS_OK; ++ } ++ return YAFFS_FAIL; ++} ++ ++/* Low level init. ++ * Typically only used by yaffs_guts_initialise, but also used by the ++ * Low level yaffs driver tests. ++ */ ++ ++int yaffs_guts_ll_init(struct yaffs_dev *dev) ++{ ++ ++ ++ yaffs_trace(YAFFS_TRACE_TRACING, "yaffs: yaffs_ll_init()"); ++ ++ if (!dev) { ++ yaffs_trace(YAFFS_TRACE_ALWAYS, ++ "yaffs: Need a device" ++ ); ++ return YAFFS_FAIL; ++ } ++ ++ if (dev->ll_init) ++ return YAFFS_OK; ++ ++ dev->internal_start_block = dev->param.start_block; ++ dev->internal_end_block = dev->param.end_block; ++ dev->block_offset = 0; ++ dev->chunk_offset = 0; ++ dev->n_free_chunks = 0; ++ ++ dev->gc_block = 0; ++ ++ if (dev->param.start_block == 0) { ++ dev->internal_start_block = dev->param.start_block + 1; ++ dev->internal_end_block = dev->param.end_block + 1; ++ dev->block_offset = 1; ++ dev->chunk_offset = dev->param.chunks_per_block; ++ } ++ ++ /* Check geometry parameters. */ ++ ++ if ((!dev->param.inband_tags && dev->param.is_yaffs2 && ++ dev->param.total_bytes_per_chunk < 1024) || ++ (!dev->param.is_yaffs2 && ++ dev->param.total_bytes_per_chunk < 512) || ++ (dev->param.inband_tags && !dev->param.is_yaffs2) || ++ dev->param.chunks_per_block < 2 || ++ dev->param.n_reserved_blocks < 2 || ++ dev->internal_start_block <= 0 || ++ dev->internal_end_block <= 0 || ++ dev->internal_end_block <= ++ (dev->internal_start_block + dev->param.n_reserved_blocks + 2) ++ ) { ++ /* otherwise it is too small */ ++ yaffs_trace(YAFFS_TRACE_ALWAYS, ++ "NAND geometry problems: chunk size %d, type is yaffs%s, inband_tags %d ", ++ dev->param.total_bytes_per_chunk, ++ dev->param.is_yaffs2 ? "2" : "", ++ dev->param.inband_tags); ++ return YAFFS_FAIL; ++ } ++ ++ /* Sort out space for inband tags, if required */ ++ if (dev->param.inband_tags) ++ dev->data_bytes_per_chunk = ++ dev->param.total_bytes_per_chunk - ++ sizeof(struct yaffs_packed_tags2_tags_only); ++ else ++ dev->data_bytes_per_chunk = dev->param.total_bytes_per_chunk; ++ ++ /* Got the right mix of functions? */ ++ if (!yaffs_check_dev_fns(dev)) { ++ /* Function missing */ ++ yaffs_trace(YAFFS_TRACE_ALWAYS, ++ "device function(s) missing or wrong"); ++ ++ return YAFFS_FAIL; ++ } ++ ++ if (yaffs_init_nand(dev) != YAFFS_OK) { ++ yaffs_trace(YAFFS_TRACE_ALWAYS, "InitialiseNAND failed"); ++ return YAFFS_FAIL; ++ } ++ ++ return YAFFS_OK; ++} ++ ++ ++int yaffs_guts_format_dev(struct yaffs_dev *dev) ++{ ++ int i; ++ enum yaffs_block_state state; ++ u32 dummy; ++ ++ if(yaffs_guts_ll_init(dev) != YAFFS_OK) ++ return YAFFS_FAIL; ++ ++ if(dev->is_mounted) ++ return YAFFS_FAIL; ++ ++ for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) { ++ yaffs_query_init_block_state(dev, i, &state, &dummy); ++ if (state != YAFFS_BLOCK_STATE_DEAD) ++ yaffs_erase_block(dev, i); ++ } ++ ++ return YAFFS_OK; ++} ++ ++ ++int yaffs_guts_initialise(struct yaffs_dev *dev) ++{ ++ int init_failed = 0; ++ unsigned x; ++ int bits; ++ ++ if(yaffs_guts_ll_init(dev) != YAFFS_OK) ++ return YAFFS_FAIL; ++ ++ if (dev->is_mounted) { ++ yaffs_trace(YAFFS_TRACE_ALWAYS, "device already mounted"); ++ return YAFFS_FAIL; ++ } ++ ++ dev->is_mounted = 1; ++ ++ /* OK now calculate a few things for the device */ ++ ++ /* ++ * Calculate all the chunk size manipulation numbers: ++ */ ++ x = dev->data_bytes_per_chunk; ++ /* We always use dev->chunk_shift and dev->chunk_div */ ++ dev->chunk_shift = calc_shifts(x); ++ x >>= dev->chunk_shift; ++ dev->chunk_div = x; ++ /* We only use chunk mask if chunk_div is 1 */ ++ dev->chunk_mask = (1 << dev->chunk_shift) - 1; ++ ++ /* ++ * Calculate chunk_grp_bits. ++ * We need to find the next power of 2 > than internal_end_block ++ */ ++ ++ x = dev->param.chunks_per_block * (dev->internal_end_block + 1); ++ ++ bits = calc_shifts_ceiling(x); ++ ++ /* Set up tnode width if wide tnodes are enabled. */ ++ if (!dev->param.wide_tnodes_disabled) { ++ /* bits must be even so that we end up with 32-bit words */ ++ if (bits & 1) ++ bits++; ++ if (bits < 16) ++ dev->tnode_width = 16; ++ else ++ dev->tnode_width = bits; ++ } else { ++ dev->tnode_width = 16; ++ } ++ ++ dev->tnode_mask = (1 << dev->tnode_width) - 1; ++ ++ /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled), ++ * so if the bitwidth of the ++ * chunk range we're using is greater than 16 we need ++ * to figure out chunk shift and chunk_grp_size ++ */ ++ ++ if (bits <= dev->tnode_width) ++ dev->chunk_grp_bits = 0; ++ else ++ dev->chunk_grp_bits = bits - dev->tnode_width; ++ ++ dev->tnode_size = (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8; ++ if (dev->tnode_size < sizeof(struct yaffs_tnode)) ++ dev->tnode_size = sizeof(struct yaffs_tnode); ++ ++ dev->chunk_grp_size = 1 << dev->chunk_grp_bits; ++ ++ if (dev->param.chunks_per_block < dev->chunk_grp_size) { ++ /* We have a problem because the soft delete won't work if ++ * the chunk group size > chunks per block. ++ * This can be remedied by using larger "virtual blocks". ++ */ ++ yaffs_trace(YAFFS_TRACE_ALWAYS, "chunk group too large"); ++ ++ return YAFFS_FAIL; ++ } ++ ++ /* Finished verifying the device, continue with initialisation */ ++ ++ /* More device initialisation */ ++ dev->all_gcs = 0; ++ dev->passive_gc_count = 0; ++ dev->oldest_dirty_gc_count = 0; ++ dev->bg_gcs = 0; ++ dev->gc_block_finder = 0; ++ dev->buffered_block = -1; ++ dev->doing_buffered_block_rewrite = 0; ++ dev->n_deleted_files = 0; ++ dev->n_bg_deletions = 0; ++ dev->n_unlinked_files = 0; ++ dev->n_ecc_fixed = 0; ++ dev->n_ecc_unfixed = 0; ++ dev->n_tags_ecc_fixed = 0; ++ dev->n_tags_ecc_unfixed = 0; ++ dev->n_erase_failures = 0; ++ dev->n_erased_blocks = 0; ++ dev->gc_disable = 0; ++ dev->has_pending_prioritised_gc = 1; ++ /* Assume the worst for now, will get fixed on first GC */ ++ INIT_LIST_HEAD(&dev->dirty_dirs); ++ dev->oldest_dirty_seq = 0; ++ dev->oldest_dirty_block = 0; ++ ++ /* Initialise temporary buffers and caches. */ ++ if (!yaffs_init_tmp_buffers(dev)) ++ init_failed = 1; ++ ++ dev->cache = NULL; ++ dev->gc_cleanup_list = NULL; ++ ++ if (!init_failed && dev->param.n_caches > 0) { ++ int i; ++ void *buf; ++ int cache_bytes = ++ dev->param.n_caches * sizeof(struct yaffs_cache); ++ ++ if (dev->param.n_caches > YAFFS_MAX_SHORT_OP_CACHES) ++ dev->param.n_caches = YAFFS_MAX_SHORT_OP_CACHES; ++ ++ dev->cache = kmalloc(cache_bytes, GFP_NOFS); ++ ++ buf = (u8 *) dev->cache; ++ ++ if (dev->cache) ++ memset(dev->cache, 0, cache_bytes); ++ ++ for (i = 0; i < dev->param.n_caches && buf; i++) { ++ dev->cache[i].object = NULL; ++ dev->cache[i].last_use = 0; ++ dev->cache[i].dirty = 0; ++ dev->cache[i].data = buf = ++ kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS); ++ } ++ if (!buf) ++ init_failed = 1; ++ ++ dev->cache_last_use = 0; ++ } ++ ++ dev->cache_hits = 0; ++ ++ if (!init_failed) { ++ dev->gc_cleanup_list = ++ kmalloc(dev->param.chunks_per_block * sizeof(u32), ++ GFP_NOFS); ++ if (!dev->gc_cleanup_list) ++ init_failed = 1; ++ } ++ ++ if (dev->param.is_yaffs2) ++ dev->param.use_header_file_size = 1; ++ ++ if (!init_failed && !yaffs_init_blocks(dev)) ++ init_failed = 1; ++ ++ yaffs_init_tnodes_and_objs(dev); ++ ++ if (!init_failed && !yaffs_create_initial_dir(dev)) ++ init_failed = 1; ++ ++ if (!init_failed && dev->param.is_yaffs2 && ++ !dev->param.disable_summary && ++ !yaffs_summary_init(dev)) ++ init_failed = 1; ++ ++ if (!init_failed) { ++ /* Now scan the flash. */ ++ if (dev->param.is_yaffs2) { ++ if (yaffs2_checkpt_restore(dev)) { ++ yaffs_check_obj_details_loaded(dev->root_dir); ++ yaffs_trace(YAFFS_TRACE_CHECKPOINT | ++ YAFFS_TRACE_MOUNT, ++ "yaffs: restored from checkpoint" ++ ); ++ } else { ++ ++ /* Clean up the mess caused by an aborted ++ * checkpoint load then scan backwards. ++ */ ++ yaffs_deinit_blocks(dev); ++ ++ yaffs_deinit_tnodes_and_objs(dev); ++ ++ dev->n_erased_blocks = 0; ++ dev->n_free_chunks = 0; ++ dev->alloc_block = -1; ++ dev->alloc_page = -1; ++ dev->n_deleted_files = 0; ++ dev->n_unlinked_files = 0; ++ dev->n_bg_deletions = 0; ++ ++ if (!init_failed && !yaffs_init_blocks(dev)) ++ init_failed = 1; ++ ++ yaffs_init_tnodes_and_objs(dev); ++ ++ if (!init_failed ++ && !yaffs_create_initial_dir(dev)) ++ init_failed = 1; ++ ++ if (!init_failed && !yaffs2_scan_backwards(dev)) ++ init_failed = 1; ++ } ++ } else if (!yaffs1_scan(dev)) { ++ init_failed = 1; ++ } ++ ++ yaffs_strip_deleted_objs(dev); ++ yaffs_fix_hanging_objs(dev); ++ if (dev->param.empty_lost_n_found) ++ yaffs_empty_l_n_f(dev); ++ } ++ ++ if (init_failed) { ++ /* Clean up the mess */ ++ yaffs_trace(YAFFS_TRACE_TRACING, ++ "yaffs: yaffs_guts_initialise() aborted."); ++ ++ yaffs_deinitialise(dev); ++ return YAFFS_FAIL; ++ } ++ ++ /* Zero out stats */ ++ dev->n_page_reads = 0; ++ dev->n_page_writes = 0; ++ dev->n_erasures = 0; ++ dev->n_gc_copies = 0; ++ dev->n_retried_writes = 0; ++ ++ dev->n_retired_blocks = 0; ++ ++ yaffs_verify_free_chunks(dev); ++ yaffs_verify_blocks(dev); ++ ++ /* Clean up any aborted checkpoint data */ ++ if (!dev->is_checkpointed && dev->blocks_in_checkpt > 0) ++ yaffs2_checkpt_invalidate(dev); ++ ++ yaffs_trace(YAFFS_TRACE_TRACING, ++ "yaffs: yaffs_guts_initialise() done."); ++ return YAFFS_OK; ++} ++ ++void yaffs_deinitialise(struct yaffs_dev *dev) ++{ ++ if (dev->is_mounted) { ++ int i; ++ ++ yaffs_deinit_blocks(dev); ++ yaffs_deinit_tnodes_and_objs(dev); ++ yaffs_summary_deinit(dev); ++ ++ if (dev->param.n_caches > 0 && dev->cache) { ++ ++ for (i = 0; i < dev->param.n_caches; i++) { ++ kfree(dev->cache[i].data); ++ dev->cache[i].data = NULL; ++ } ++ ++ kfree(dev->cache); ++ dev->cache = NULL; ++ } ++ ++ kfree(dev->gc_cleanup_list); ++ ++ for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) ++ kfree(dev->temp_buffer[i].buffer); ++ ++ dev->is_mounted = 0; ++ ++ yaffs_deinit_nand(dev); ++ } ++} ++ ++int yaffs_count_free_chunks(struct yaffs_dev *dev) ++{ ++ int n_free = 0; ++ int b; ++ struct yaffs_block_info *blk; ++ ++ blk = dev->block_info; ++ for (b = dev->internal_start_block; b <= dev->internal_end_block; b++) { ++ switch (blk->block_state) { ++ case YAFFS_BLOCK_STATE_EMPTY: ++ case YAFFS_BLOCK_STATE_ALLOCATING: ++ case YAFFS_BLOCK_STATE_COLLECTING: ++ case YAFFS_BLOCK_STATE_FULL: ++ n_free += ++ (dev->param.chunks_per_block - blk->pages_in_use + ++ blk->soft_del_pages); ++ break; ++ default: ++ break; ++ } ++ blk++; ++ } ++ return n_free; ++} ++ ++int yaffs_get_n_free_chunks(struct yaffs_dev *dev) ++{ ++ /* This is what we report to the outside world */ ++ int n_free; ++ int n_dirty_caches; ++ int blocks_for_checkpt; ++ int i; ++ ++ n_free = dev->n_free_chunks; ++ n_free += dev->n_deleted_files; ++ ++ /* Now count and subtract the number of dirty chunks in the cache. */ ++ ++ for (n_dirty_caches = 0, i = 0; i < dev->param.n_caches; i++) { ++ if (dev->cache[i].dirty) ++ n_dirty_caches++; ++ } ++ ++ n_free -= n_dirty_caches; ++ ++ n_free -= ++ ((dev->param.n_reserved_blocks + 1) * dev->param.chunks_per_block); ++ ++ /* Now figure checkpoint space and report that... */ ++ blocks_for_checkpt = yaffs_calc_checkpt_blocks_required(dev); ++ ++ n_free -= (blocks_for_checkpt * dev->param.chunks_per_block); ++ ++ if (n_free < 0) ++ n_free = 0; ++ ++ return n_free; ++} ++ ++ ++ ++/* ++ * Marshalling functions to get loff_t file sizes into and out of ++ * object headers. ++ */ ++void yaffs_oh_size_load(struct yaffs_obj_hdr *oh, loff_t fsize) ++{ ++ oh->file_size_low = (fsize & 0xFFFFFFFF); ++ oh->file_size_high = ((fsize >> 32) & 0xFFFFFFFF); ++} ++ ++loff_t yaffs_oh_to_size(struct yaffs_obj_hdr *oh) ++{ ++ loff_t retval; ++ ++ if (sizeof(loff_t) >= 8 && ~(oh->file_size_high)) ++ retval = (((loff_t) oh->file_size_high) << 32) | ++ (((loff_t) oh->file_size_low) & 0xFFFFFFFF); ++ else ++ retval = (loff_t) oh->file_size_low; ++ ++ return retval; ++} ++ ++ ++void yaffs_count_blocks_by_state(struct yaffs_dev *dev, int bs[10]) ++{ ++ int i; ++ struct yaffs_block_info *bi; ++ int s; ++ ++ for(i = 0; i < 10; i++) ++ bs[i] = 0; ++ ++ for(i = dev->internal_start_block; i <= dev->internal_end_block; i++) { ++ bi = yaffs_get_block_info(dev, i); ++ s = bi->block_state; ++ if(s > YAFFS_BLOCK_STATE_DEAD || s < YAFFS_BLOCK_STATE_UNKNOWN) ++ bs[0]++; ++ else ++ bs[s]++; ++ } ++} +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_guts.h linux-3.15-rc5/fs/yaffs2/yaffs_guts.h +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_guts.h 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_guts.h 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,1007 @@ ++/* ++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU Lesser General Public License version 2.1 as ++ * published by the Free Software Foundation. ++ * ++ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. ++ */ ++ ++#ifndef __YAFFS_GUTS_H__ ++#define __YAFFS_GUTS_H__ ++ ++#include "yportenv.h" ++ ++#define YAFFS_OK 1 ++#define YAFFS_FAIL 0 ++ ++/* Give us a Y=0x59, ++ * Give us an A=0x41, ++ * Give us an FF=0xff ++ * Give us an S=0x53 ++ * And what have we got... ++ */ ++#define YAFFS_MAGIC 0x5941ff53 ++ ++/* ++ * Tnodes form a tree with the tnodes in "levels" ++ * Levels greater than 0 hold 8 slots which point to other tnodes. ++ * Those at level 0 hold 16 slots which point to chunks in NAND. ++ * ++ * A maximum level of 8 thust supports files of size up to: ++ * ++ * 2^(3*MAX_LEVEL+4) ++ * ++ * Thus a max level of 8 supports files with up to 2^^28 chunks which gives ++ * a maximum file size of around 512Gbytees with 2k chunks. ++ */ ++#define YAFFS_NTNODES_LEVEL0 16 ++#define YAFFS_TNODES_LEVEL0_BITS 4 ++#define YAFFS_TNODES_LEVEL0_MASK 0xf ++ ++#define YAFFS_NTNODES_INTERNAL (YAFFS_NTNODES_LEVEL0 / 2) ++#define YAFFS_TNODES_INTERNAL_BITS (YAFFS_TNODES_LEVEL0_BITS - 1) ++#define YAFFS_TNODES_INTERNAL_MASK 0x7 ++#define YAFFS_TNODES_MAX_LEVEL 8 ++#define YAFFS_TNODES_MAX_BITS (YAFFS_TNODES_LEVEL0_BITS + \ ++ YAFFS_TNODES_INTERNAL_BITS * \ ++ YAFFS_TNODES_MAX_LEVEL) ++#define YAFFS_MAX_CHUNK_ID ((1 << YAFFS_TNODES_MAX_BITS) - 1) ++ ++#define YAFFS_MAX_FILE_SIZE_32 0x7fffffff ++ ++/* Constants for YAFFS1 mode */ ++#define YAFFS_BYTES_PER_SPARE 16 ++#define YAFFS_BYTES_PER_CHUNK 512 ++#define YAFFS_CHUNK_SIZE_SHIFT 9 ++#define YAFFS_CHUNKS_PER_BLOCK 32 ++#define YAFFS_BYTES_PER_BLOCK (YAFFS_CHUNKS_PER_BLOCK*YAFFS_BYTES_PER_CHUNK) ++ ++#define YAFFS_MIN_YAFFS2_CHUNK_SIZE 1024 ++#define YAFFS_MIN_YAFFS2_SPARE_SIZE 32 ++ ++ ++ ++#define YAFFS_ALLOCATION_NOBJECTS 100 ++#define YAFFS_ALLOCATION_NTNODES 100 ++#define YAFFS_ALLOCATION_NLINKS 100 ++ ++#define YAFFS_NOBJECT_BUCKETS 256 ++ ++#define YAFFS_OBJECT_SPACE 0x40000 ++#define YAFFS_MAX_OBJECT_ID (YAFFS_OBJECT_SPACE - 1) ++ ++/* Binary data version stamps */ ++#define YAFFS_SUMMARY_VERSION 1 ++#define YAFFS_CHECKPOINT_VERSION 7 ++ ++#ifdef CONFIG_YAFFS_UNICODE ++#define YAFFS_MAX_NAME_LENGTH 127 ++#define YAFFS_MAX_ALIAS_LENGTH 79 ++#else ++#define YAFFS_MAX_NAME_LENGTH 255 ++#define YAFFS_MAX_ALIAS_LENGTH 159 ++#endif ++ ++#define YAFFS_SHORT_NAME_LENGTH 15 ++ ++/* Some special object ids for pseudo objects */ ++#define YAFFS_OBJECTID_ROOT 1 ++#define YAFFS_OBJECTID_LOSTNFOUND 2 ++#define YAFFS_OBJECTID_UNLINKED 3 ++#define YAFFS_OBJECTID_DELETED 4 ++ ++/* Fake object Id for summary data */ ++#define YAFFS_OBJECTID_SUMMARY 0x10 ++ ++/* Pseudo object ids for checkpointing */ ++#define YAFFS_OBJECTID_CHECKPOINT_DATA 0x20 ++#define YAFFS_SEQUENCE_CHECKPOINT_DATA 0x21 ++ ++#define YAFFS_MAX_SHORT_OP_CACHES 20 ++ ++#define YAFFS_N_TEMP_BUFFERS 6 ++ ++/* We limit the number attempts at sucessfully saving a chunk of data. ++ * Small-page devices have 32 pages per block; large-page devices have 64. ++ * Default to something in the order of 5 to 10 blocks worth of chunks. ++ */ ++#define YAFFS_WR_ATTEMPTS (5*64) ++ ++/* Sequence numbers are used in YAFFS2 to determine block allocation order. ++ * The range is limited slightly to help distinguish bad numbers from good. ++ * This also allows us to perhaps in the future use special numbers for ++ * special purposes. ++ * EFFFFF00 allows the allocation of 8 blocks/second (~1Mbytes) for 15 years, ++ * and is a larger number than the lifetime of a 2GB device. ++ */ ++#define YAFFS_LOWEST_SEQUENCE_NUMBER 0x00001000 ++#define YAFFS_HIGHEST_SEQUENCE_NUMBER 0xefffff00 ++ ++/* Special sequence number for bad block that failed to be marked bad */ ++#define YAFFS_SEQUENCE_BAD_BLOCK 0xffff0000 ++ ++/* ChunkCache is used for short read/write operations.*/ ++struct yaffs_cache { ++ struct yaffs_obj *object; ++ int chunk_id; ++ int last_use; ++ int dirty; ++ int n_bytes; /* Only valid if the cache is dirty */ ++ int locked; /* Can't push out or flush while locked. */ ++ u8 *data; ++}; ++ ++/* yaffs1 tags structures in RAM ++ * NB This uses bitfield. Bitfields should not straddle a u32 boundary ++ * otherwise the structure size will get blown out. ++ */ ++ ++struct yaffs_tags { ++ u32 chunk_id:20; ++ u32 serial_number:2; ++ u32 n_bytes_lsb:10; ++ u32 obj_id:18; ++ u32 ecc:12; ++ u32 n_bytes_msb:2; ++}; ++ ++union yaffs_tags_union { ++ struct yaffs_tags as_tags; ++ u8 as_bytes[8]; ++}; ++ ++ ++/* Stuff used for extended tags in YAFFS2 */ ++ ++enum yaffs_ecc_result { ++ YAFFS_ECC_RESULT_UNKNOWN, ++ YAFFS_ECC_RESULT_NO_ERROR, ++ YAFFS_ECC_RESULT_FIXED, ++ YAFFS_ECC_RESULT_UNFIXED ++}; ++ ++enum yaffs_obj_type { ++ YAFFS_OBJECT_TYPE_UNKNOWN, ++ YAFFS_OBJECT_TYPE_FILE, ++ YAFFS_OBJECT_TYPE_SYMLINK, ++ YAFFS_OBJECT_TYPE_DIRECTORY, ++ YAFFS_OBJECT_TYPE_HARDLINK, ++ YAFFS_OBJECT_TYPE_SPECIAL ++}; ++ ++#define YAFFS_OBJECT_TYPE_MAX YAFFS_OBJECT_TYPE_SPECIAL ++ ++struct yaffs_ext_tags { ++ unsigned chunk_used; /* Status of the chunk: used or unused */ ++ unsigned obj_id; /* If 0 this is not used */ ++ unsigned chunk_id; /* If 0 this is a header, else a data chunk */ ++ unsigned n_bytes; /* Only valid for data chunks */ ++ ++ /* The following stuff only has meaning when we read */ ++ enum yaffs_ecc_result ecc_result; ++ unsigned block_bad; ++ ++ /* YAFFS 1 stuff */ ++ unsigned is_deleted; /* The chunk is marked deleted */ ++ unsigned serial_number; /* Yaffs1 2-bit serial number */ ++ ++ /* YAFFS2 stuff */ ++ unsigned seq_number; /* The sequence number of this block */ ++ ++ /* Extra info if this is an object header (YAFFS2 only) */ ++ ++ unsigned extra_available; /* Extra info available if not zero */ ++ unsigned extra_parent_id; /* The parent object */ ++ unsigned extra_is_shrink; /* Is it a shrink header? */ ++ unsigned extra_shadows; /* Does this shadow another object? */ ++ ++ enum yaffs_obj_type extra_obj_type; /* What object type? */ ++ ++ loff_t extra_file_size; /* Length if it is a file */ ++ unsigned extra_equiv_id; /* Equivalent object for a hard link */ ++}; ++ ++/* Spare structure for YAFFS1 */ ++struct yaffs_spare { ++ u8 tb0; ++ u8 tb1; ++ u8 tb2; ++ u8 tb3; ++ u8 page_status; /* set to 0 to delete the chunk */ ++ u8 block_status; ++ u8 tb4; ++ u8 tb5; ++ u8 ecc1[3]; ++ u8 tb6; ++ u8 tb7; ++ u8 ecc2[3]; ++}; ++ ++/*Special structure for passing through to mtd */ ++struct yaffs_nand_spare { ++ struct yaffs_spare spare; ++ int eccres1; ++ int eccres2; ++}; ++ ++/* Block data in RAM */ ++ ++enum yaffs_block_state { ++ YAFFS_BLOCK_STATE_UNKNOWN = 0, ++ ++ YAFFS_BLOCK_STATE_SCANNING, ++ /* Being scanned */ ++ ++ YAFFS_BLOCK_STATE_NEEDS_SCAN, ++ /* The block might have something on it (ie it is allocating or full, ++ * perhaps empty) but it needs to be scanned to determine its true ++ * state. ++ * This state is only valid during scanning. ++ * NB We tolerate empty because the pre-scanner might be incapable of ++ * deciding ++ * However, if this state is returned on a YAFFS2 device, ++ * then we expect a sequence number ++ */ ++ ++ YAFFS_BLOCK_STATE_EMPTY, ++ /* This block is empty */ ++ ++ YAFFS_BLOCK_STATE_ALLOCATING, ++ /* This block is partially allocated. ++ * At least one page holds valid data. ++ * This is the one currently being used for page ++ * allocation. Should never be more than one of these. ++ * If a block is only partially allocated at mount it is treated as ++ * full. ++ */ ++ ++ YAFFS_BLOCK_STATE_FULL, ++ /* All the pages in this block have been allocated. ++ * If a block was only partially allocated when mounted we treat ++ * it as fully allocated. ++ */ ++ ++ YAFFS_BLOCK_STATE_DIRTY, ++ /* The block was full and now all chunks have been deleted. ++ * Erase me, reuse me. ++ */ ++ ++ YAFFS_BLOCK_STATE_CHECKPOINT, ++ /* This block is assigned to holding checkpoint data. */ ++ ++ YAFFS_BLOCK_STATE_COLLECTING, ++ /* This block is being garbage collected */ ++ ++ YAFFS_BLOCK_STATE_DEAD ++ /* This block has failed and is not in use */ ++}; ++ ++#define YAFFS_NUMBER_OF_BLOCK_STATES (YAFFS_BLOCK_STATE_DEAD + 1) ++ ++struct yaffs_block_info { ++ ++ s32 soft_del_pages:10; /* number of soft deleted pages */ ++ s32 pages_in_use:10; /* number of pages in use */ ++ u32 block_state:4; /* One of the above block states. */ ++ /* NB use unsigned because enum is sometimes ++ * an int */ ++ u32 needs_retiring:1; /* Data has failed on this block, */ ++ /*need to get valid data off and retire*/ ++ u32 skip_erased_check:1;/* Skip the erased check on this block */ ++ u32 gc_prioritise:1; /* An ECC check or blank check has failed. ++ Block should be prioritised for GC */ ++ u32 chunk_error_strikes:3; /* How many times we've had ecc etc ++ failures on this block and tried to reuse it */ ++ u32 has_summary:1; /* The block has a summary */ ++ ++ u32 has_shrink_hdr:1; /* This block has at least one shrink header */ ++ u32 seq_number; /* block sequence number for yaffs2 */ ++ ++}; ++ ++/* -------------------------- Object structure -------------------------------*/ ++/* This is the object structure as stored on NAND */ ++ ++struct yaffs_obj_hdr { ++ enum yaffs_obj_type type; ++ ++ /* Apply to everything */ ++ int parent_obj_id; ++ u16 sum_no_longer_used; /* checksum of name. No longer used */ ++ YCHAR name[YAFFS_MAX_NAME_LENGTH + 1]; ++ ++ /* The following apply to all object types except for hard links */ ++ u32 yst_mode; /* protection */ ++ ++ u32 yst_uid; ++ u32 yst_gid; ++ u32 yst_atime; ++ u32 yst_mtime; ++ u32 yst_ctime; ++ ++ /* File size applies to files only */ ++ u32 file_size_low; ++ ++ /* Equivalent object id applies to hard links only. */ ++ int equiv_id; ++ ++ /* Alias is for symlinks only. */ ++ YCHAR alias[YAFFS_MAX_ALIAS_LENGTH + 1]; ++ ++ u32 yst_rdev; /* stuff for block and char devices (major/min) */ ++ ++ u32 win_ctime[2]; ++ u32 win_atime[2]; ++ u32 win_mtime[2]; ++ ++ u32 inband_shadowed_obj_id; ++ u32 inband_is_shrink; ++ ++ u32 file_size_high; ++ u32 reserved[1]; ++ int shadows_obj; /* This object header shadows the ++ specified object if > 0 */ ++ ++ /* is_shrink applies to object headers written when wemake a hole. */ ++ u32 is_shrink; ++ ++}; ++ ++/*--------------------------- Tnode -------------------------- */ ++ ++struct yaffs_tnode { ++ struct yaffs_tnode *internal[YAFFS_NTNODES_INTERNAL]; ++}; ++ ++/*------------------------ Object -----------------------------*/ ++/* An object can be one of: ++ * - a directory (no data, has children links ++ * - a regular file (data.... not prunes :->). ++ * - a symlink [symbolic link] (the alias). ++ * - a hard link ++ */ ++ ++struct yaffs_file_var { ++ loff_t file_size; ++ loff_t scanned_size; ++ loff_t shrink_size; ++ int top_level; ++ struct yaffs_tnode *top; ++}; ++ ++struct yaffs_dir_var { ++ struct list_head children; /* list of child links */ ++ struct list_head dirty; /* Entry for list of dirty directories */ ++}; ++ ++struct yaffs_symlink_var { ++ YCHAR *alias; ++}; ++ ++struct yaffs_hardlink_var { ++ struct yaffs_obj *equiv_obj; ++ u32 equiv_id; ++}; ++ ++union yaffs_obj_var { ++ struct yaffs_file_var file_variant; ++ struct yaffs_dir_var dir_variant; ++ struct yaffs_symlink_var symlink_variant; ++ struct yaffs_hardlink_var hardlink_variant; ++}; ++ ++struct yaffs_obj { ++ u8 deleted:1; /* This should only apply to unlinked files. */ ++ u8 soft_del:1; /* it has also been soft deleted */ ++ u8 unlinked:1; /* An unlinked file.*/ ++ u8 fake:1; /* A fake object has no presence on NAND. */ ++ u8 rename_allowed:1; /* Some objects cannot be renamed. */ ++ u8 unlink_allowed:1; ++ u8 dirty:1; /* the object needs to be written to flash */ ++ u8 valid:1; /* When the file system is being loaded up, this ++ * object might be created before the data ++ * is available ++ * ie. file data chunks encountered before ++ * the header. ++ */ ++ u8 lazy_loaded:1; /* This object has been lazy loaded and ++ * is missing some detail */ ++ ++ u8 defered_free:1; /* Object is removed from NAND, but is ++ * still in the inode cache. ++ * Free of object is defered. ++ * until the inode is released. ++ */ ++ u8 being_created:1; /* This object is still being created ++ * so skip some verification checks. */ ++ u8 is_shadowed:1; /* This object is shadowed on the way ++ * to being renamed. */ ++ ++ u8 xattr_known:1; /* We know if this has object has xattribs ++ * or not. */ ++ u8 has_xattr:1; /* This object has xattribs. ++ * Only valid if xattr_known. */ ++ ++ u8 serial; /* serial number of chunk in NAND.*/ ++ u16 sum; /* sum of the name to speed searching */ ++ ++ struct yaffs_dev *my_dev; /* The device I'm on */ ++ ++ struct list_head hash_link; /* list of objects in hash bucket */ ++ ++ struct list_head hard_links; /* hard linked object chain*/ ++ ++ /* directory structure stuff */ ++ /* also used for linking up the free list */ ++ struct yaffs_obj *parent; ++ struct list_head siblings; ++ ++ /* Where's my object header in NAND? */ ++ int hdr_chunk; ++ ++ int n_data_chunks; /* Number of data chunks for this file. */ ++ ++ u32 obj_id; /* the object id value */ ++ ++ u32 yst_mode; ++ ++ YCHAR short_name[YAFFS_SHORT_NAME_LENGTH + 1]; ++ ++#ifdef CONFIG_YAFFS_WINCE ++ u32 win_ctime[2]; ++ u32 win_mtime[2]; ++ u32 win_atime[2]; ++#else ++ u32 yst_uid; ++ u32 yst_gid; ++ u32 yst_atime; ++ u32 yst_mtime; ++ u32 yst_ctime; ++#endif ++ ++ u32 yst_rdev; ++ ++ void *my_inode; ++ ++ enum yaffs_obj_type variant_type; ++ ++ union yaffs_obj_var variant; ++ ++}; ++ ++struct yaffs_obj_bucket { ++ struct list_head list; ++ int count; ++}; ++ ++/* yaffs_checkpt_obj holds the definition of an object as dumped ++ * by checkpointing. ++ */ ++ ++struct yaffs_checkpt_obj { ++ int struct_type; ++ u32 obj_id; ++ u32 parent_id; ++ int hdr_chunk; ++ enum yaffs_obj_type variant_type:3; ++ u8 deleted:1; ++ u8 soft_del:1; ++ u8 unlinked:1; ++ u8 fake:1; ++ u8 rename_allowed:1; ++ u8 unlink_allowed:1; ++ u8 serial; ++ int n_data_chunks; ++ loff_t size_or_equiv_obj; ++}; ++ ++/*--------------------- Temporary buffers ---------------- ++ * ++ * These are chunk-sized working buffers. Each device has a few. ++ */ ++ ++struct yaffs_buffer { ++ u8 *buffer; ++ int in_use; ++}; ++ ++/*----------------- Device ---------------------------------*/ ++ ++struct yaffs_param { ++ const YCHAR *name; ++ ++ /* ++ * Entry parameters set up way early. Yaffs sets up the rest. ++ * The structure should be zeroed out before use so that unused ++ * and default values are zero. ++ */ ++ ++ int inband_tags; /* Use unband tags */ ++ u32 total_bytes_per_chunk; /* Should be >= 512, does not need to ++ be a power of 2 */ ++ int chunks_per_block; /* does not need to be a power of 2 */ ++ int spare_bytes_per_chunk; /* spare area size */ ++ int start_block; /* Start block we're allowed to use */ ++ int end_block; /* End block we're allowed to use */ ++ int n_reserved_blocks; /* Tuneable so that we can reduce ++ * reserved blocks on NOR and RAM. */ ++ ++ int n_caches; /* If <= 0, then short op caching is disabled, ++ * else the number of short op caches. ++ */ ++ int cache_bypass_aligned; /* If non-zero then bypass the cache for ++ * aligned writes. ++ */ ++ ++ int use_nand_ecc; /* Flag to decide whether or not to use ++ * NAND driver ECC on data (yaffs1) */ ++ int tags_9bytes; /* Use 9 byte tags */ ++ int no_tags_ecc; /* Flag to decide whether or not to do ECC ++ * on packed tags (yaffs2) */ ++ ++ int is_yaffs2; /* Use yaffs2 mode on this device */ ++ ++ int empty_lost_n_found; /* Auto-empty lost+found directory on mount */ ++ ++ int refresh_period; /* How often to check for a block refresh */ ++ ++ /* Checkpoint control. Can be set before or after initialisation */ ++ u8 skip_checkpt_rd; ++ u8 skip_checkpt_wr; ++ ++ int enable_xattr; /* Enable xattribs */ ++ ++ int max_objects; /* ++ * Set to limit the number of objects created. ++ * 0 = no limit. ++ */ ++ ++ /* The remove_obj_fn function must be supplied by OS flavours that ++ * need it. ++ * yaffs direct uses it to implement the faster readdir. ++ * Linux uses it to protect the directory during unlocking. ++ */ ++ void (*remove_obj_fn) (struct yaffs_obj *obj); ++ ++ /* Callback to mark the superblock dirty */ ++ void (*sb_dirty_fn) (struct yaffs_dev *dev); ++ ++ /* Callback to control garbage collection. */ ++ unsigned (*gc_control_fn) (struct yaffs_dev *dev); ++ ++ /* Debug control flags. Don't use unless you know what you're doing */ ++ int use_header_file_size; /* Flag to determine if we should use ++ * file sizes from the header */ ++ int disable_lazy_load; /* Disable lazy loading on this device */ ++ int wide_tnodes_disabled; /* Set to disable wide tnodes */ ++ int disable_soft_del; /* yaffs 1 only: Set to disable the use of ++ * softdeletion. */ ++ ++ int defered_dir_update; /* Set to defer directory updates */ ++ ++#ifdef CONFIG_YAFFS_AUTO_UNICODE ++ int auto_unicode; ++#endif ++ int always_check_erased; /* Force chunk erased check always on */ ++ ++ int disable_summary; ++ int disable_bad_block_marking; ++ ++}; ++ ++struct yaffs_driver { ++ int (*drv_write_chunk_fn) (struct yaffs_dev *dev, int nand_chunk, ++ const u8 *data, int data_len, ++ const u8 *oob, int oob_len); ++ int (*drv_read_chunk_fn) (struct yaffs_dev *dev, int nand_chunk, ++ u8 *data, int data_len, ++ u8 *oob, int oob_len, ++ enum yaffs_ecc_result *ecc_result); ++ int (*drv_erase_fn) (struct yaffs_dev *dev, int block_no); ++ int (*drv_mark_bad_fn) (struct yaffs_dev *dev, int block_no); ++ int (*drv_check_bad_fn) (struct yaffs_dev *dev, int block_no); ++ int (*drv_initialise_fn) (struct yaffs_dev *dev); ++ int (*drv_deinitialise_fn) (struct yaffs_dev *dev); ++}; ++ ++struct yaffs_tags_handler { ++ int (*write_chunk_tags_fn) (struct yaffs_dev *dev, ++ int nand_chunk, const u8 *data, ++ const struct yaffs_ext_tags *tags); ++ int (*read_chunk_tags_fn) (struct yaffs_dev *dev, ++ int nand_chunk, u8 *data, ++ struct yaffs_ext_tags *tags); ++ ++ int (*query_block_fn) (struct yaffs_dev *dev, int block_no, ++ enum yaffs_block_state *state, ++ u32 *seq_number); ++ int (*mark_bad_fn) (struct yaffs_dev *dev, int block_no); ++}; ++ ++struct yaffs_dev { ++ struct yaffs_param param; ++ struct yaffs_driver drv; ++ struct yaffs_tags_handler tagger; ++ ++ /* Context storage. Holds extra OS specific data for this device */ ++ ++ void *os_context; ++ void *driver_context; ++ ++ struct list_head dev_list; ++ ++ int ll_init; ++ /* Runtime parameters. Set up by YAFFS. */ ++ int data_bytes_per_chunk; ++ ++ /* Non-wide tnode stuff */ ++ u16 chunk_grp_bits; /* Number of bits that need to be resolved if ++ * the tnodes are not wide enough. ++ */ ++ u16 chunk_grp_size; /* == 2^^chunk_grp_bits */ ++ ++ /* Stuff to support wide tnodes */ ++ u32 tnode_width; ++ u32 tnode_mask; ++ u32 tnode_size; ++ ++ /* Stuff for figuring out file offset to chunk conversions */ ++ u32 chunk_shift; /* Shift value */ ++ u32 chunk_div; /* Divisor after shifting: 1 for 2^n sizes */ ++ u32 chunk_mask; /* Mask to use for power-of-2 case */ ++ ++ int is_mounted; ++ int read_only; ++ int is_checkpointed; ++ ++ /* Stuff to support block offsetting to support start block zero */ ++ int internal_start_block; ++ int internal_end_block; ++ int block_offset; ++ int chunk_offset; ++ ++ /* Runtime checkpointing stuff */ ++ int checkpt_page_seq; /* running sequence number of checkpt pages */ ++ int checkpt_byte_count; ++ int checkpt_byte_offs; ++ u8 *checkpt_buffer; ++ int checkpt_open_write; ++ int blocks_in_checkpt; ++ int checkpt_cur_chunk; ++ int checkpt_cur_block; ++ int checkpt_next_block; ++ int *checkpt_block_list; ++ int checkpt_max_blocks; ++ u32 checkpt_sum; ++ u32 checkpt_xor; ++ ++ int checkpoint_blocks_required; /* Number of blocks needed to store ++ * current checkpoint set */ ++ ++ /* Block Info */ ++ struct yaffs_block_info *block_info; ++ u8 *chunk_bits; /* bitmap of chunks in use */ ++ u8 block_info_alt:1; /* allocated using alternative alloc */ ++ u8 chunk_bits_alt:1; /* allocated using alternative alloc */ ++ int chunk_bit_stride; /* Number of bytes of chunk_bits per block. ++ * Must be consistent with chunks_per_block. ++ */ ++ ++ int n_erased_blocks; ++ int alloc_block; /* Current block being allocated off */ ++ u32 alloc_page; ++ int alloc_block_finder; /* Used to search for next allocation block */ ++ ++ /* Object and Tnode memory management */ ++ void *allocator; ++ int n_obj; ++ int n_tnodes; ++ ++ int n_hardlinks; ++ ++ struct yaffs_obj_bucket obj_bucket[YAFFS_NOBJECT_BUCKETS]; ++ u32 bucket_finder; ++ ++ int n_free_chunks; ++ ++ /* Garbage collection control */ ++ u32 *gc_cleanup_list; /* objects to delete at the end of a GC. */ ++ u32 n_clean_ups; ++ ++ unsigned has_pending_prioritised_gc; /* We think this device might ++ have pending prioritised gcs */ ++ unsigned gc_disable; ++ unsigned gc_block_finder; ++ unsigned gc_dirtiest; ++ unsigned gc_pages_in_use; ++ unsigned gc_not_done; ++ unsigned gc_block; ++ unsigned gc_chunk; ++ unsigned gc_skip; ++ struct yaffs_summary_tags *gc_sum_tags; ++ ++ /* Special directories */ ++ struct yaffs_obj *root_dir; ++ struct yaffs_obj *lost_n_found; ++ ++ int buffered_block; /* Which block is buffered here? */ ++ int doing_buffered_block_rewrite; ++ ++ struct yaffs_cache *cache; ++ int cache_last_use; ++ ++ /* Stuff for background deletion and unlinked files. */ ++ struct yaffs_obj *unlinked_dir; /* Directory where unlinked and deleted ++ files live. */ ++ struct yaffs_obj *del_dir; /* Directory where deleted objects are ++ sent to disappear. */ ++ struct yaffs_obj *unlinked_deletion; /* Current file being ++ background deleted. */ ++ int n_deleted_files; /* Count of files awaiting deletion; */ ++ int n_unlinked_files; /* Count of unlinked files. */ ++ int n_bg_deletions; /* Count of background deletions. */ ++ ++ /* Temporary buffer management */ ++ struct yaffs_buffer temp_buffer[YAFFS_N_TEMP_BUFFERS]; ++ int max_temp; ++ int temp_in_use; ++ int unmanaged_buffer_allocs; ++ int unmanaged_buffer_deallocs; ++ ++ /* yaffs2 runtime stuff */ ++ unsigned seq_number; /* Sequence number of currently ++ allocating block */ ++ unsigned oldest_dirty_seq; ++ unsigned oldest_dirty_block; ++ ++ /* Block refreshing */ ++ int refresh_skip; /* A skip down counter. ++ * Refresh happens when this gets to zero. */ ++ ++ /* Dirty directory handling */ ++ struct list_head dirty_dirs; /* List of dirty directories */ ++ ++ /* Summary */ ++ int chunks_per_summary; ++ struct yaffs_summary_tags *sum_tags; ++ ++ /* Statistics */ ++ u32 n_page_writes; ++ u32 n_page_reads; ++ u32 n_erasures; ++ u32 n_bad_queries; ++ u32 n_bad_markings; ++ u32 n_erase_failures; ++ u32 n_gc_copies; ++ u32 all_gcs; ++ u32 passive_gc_count; ++ u32 oldest_dirty_gc_count; ++ u32 n_gc_blocks; ++ u32 bg_gcs; ++ u32 n_retried_writes; ++ u32 n_retired_blocks; ++ u32 n_ecc_fixed; ++ u32 n_ecc_unfixed; ++ u32 n_tags_ecc_fixed; ++ u32 n_tags_ecc_unfixed; ++ u32 n_deletions; ++ u32 n_unmarked_deletions; ++ u32 refresh_count; ++ u32 cache_hits; ++ u32 tags_used; ++ u32 summary_used; ++ ++}; ++ ++/* The CheckpointDevice structure holds the device information that changes ++ *at runtime and must be preserved over unmount/mount cycles. ++ */ ++struct yaffs_checkpt_dev { ++ int struct_type; ++ int n_erased_blocks; ++ int alloc_block; /* Current block being allocated off */ ++ u32 alloc_page; ++ int n_free_chunks; ++ ++ int n_deleted_files; /* Count of files awaiting deletion; */ ++ int n_unlinked_files; /* Count of unlinked files. */ ++ int n_bg_deletions; /* Count of background deletions. */ ++ ++ /* yaffs2 runtime stuff */ ++ unsigned seq_number; /* Sequence number of currently ++ * allocating block */ ++ ++}; ++ ++struct yaffs_checkpt_validity { ++ int struct_type; ++ u32 magic; ++ u32 version; ++ u32 head; ++}; ++ ++struct yaffs_shadow_fixer { ++ int obj_id; ++ int shadowed_id; ++ struct yaffs_shadow_fixer *next; ++}; ++ ++/* Structure for doing xattr modifications */ ++struct yaffs_xattr_mod { ++ int set; /* If 0 then this is a deletion */ ++ const YCHAR *name; ++ const void *data; ++ int size; ++ int flags; ++ int result; ++}; ++ ++/*----------------------- YAFFS Functions -----------------------*/ ++ ++int yaffs_guts_initialise(struct yaffs_dev *dev); ++void yaffs_deinitialise(struct yaffs_dev *dev); ++ ++int yaffs_get_n_free_chunks(struct yaffs_dev *dev); ++ ++int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR * old_name, ++ struct yaffs_obj *new_dir, const YCHAR * new_name); ++ ++int yaffs_unlinker(struct yaffs_obj *dir, const YCHAR * name); ++int yaffs_del_obj(struct yaffs_obj *obj); ++struct yaffs_obj *yaffs_retype_obj(struct yaffs_obj *obj, ++ enum yaffs_obj_type type); ++ ++ ++int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR * name, int buffer_size); ++loff_t yaffs_get_obj_length(struct yaffs_obj *obj); ++int yaffs_get_obj_inode(struct yaffs_obj *obj); ++unsigned yaffs_get_obj_type(struct yaffs_obj *obj); ++int yaffs_get_obj_link_count(struct yaffs_obj *obj); ++ ++/* File operations */ ++int yaffs_file_rd(struct yaffs_obj *obj, u8 * buffer, loff_t offset, ++ int n_bytes); ++int yaffs_wr_file(struct yaffs_obj *obj, const u8 * buffer, loff_t offset, ++ int n_bytes, int write_trhrough); ++int yaffs_resize_file(struct yaffs_obj *obj, loff_t new_size); ++ ++struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent, ++ const YCHAR *name, u32 mode, u32 uid, ++ u32 gid); ++ ++int yaffs_flush_file(struct yaffs_obj *obj, int update_time, int data_sync); ++ ++/* Flushing and checkpointing */ ++void yaffs_flush_whole_cache(struct yaffs_dev *dev); ++ ++int yaffs_checkpoint_save(struct yaffs_dev *dev); ++int yaffs_checkpoint_restore(struct yaffs_dev *dev); ++ ++/* Directory operations */ ++struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR *name, ++ u32 mode, u32 uid, u32 gid); ++struct yaffs_obj *yaffs_find_by_name(struct yaffs_obj *the_dir, ++ const YCHAR *name); ++struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number); ++ ++/* Link operations */ ++struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR *name, ++ struct yaffs_obj *equiv_obj); ++ ++struct yaffs_obj *yaffs_get_equivalent_obj(struct yaffs_obj *obj); ++ ++/* Symlink operations */ ++struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent, ++ const YCHAR *name, u32 mode, u32 uid, ++ u32 gid, const YCHAR *alias); ++YCHAR *yaffs_get_symlink_alias(struct yaffs_obj *obj); ++ ++/* Special inodes (fifos, sockets and devices) */ ++struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent, ++ const YCHAR *name, u32 mode, u32 uid, ++ u32 gid, u32 rdev); ++ ++int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR *name, ++ const void *value, int size, int flags); ++int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR *name, void *value, ++ int size); ++int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size); ++int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR *name); ++ ++/* Special directories */ ++struct yaffs_obj *yaffs_root(struct yaffs_dev *dev); ++struct yaffs_obj *yaffs_lost_n_found(struct yaffs_dev *dev); ++ ++void yaffs_handle_defered_free(struct yaffs_obj *obj); ++ ++void yaffs_update_dirty_dirs(struct yaffs_dev *dev); ++ ++int yaffs_bg_gc(struct yaffs_dev *dev, unsigned urgency); ++ ++/* Debug dump */ ++int yaffs_dump_obj(struct yaffs_obj *obj); ++ ++void yaffs_guts_test(struct yaffs_dev *dev); ++int yaffs_guts_ll_init(struct yaffs_dev *dev); ++ ++ ++/* A few useful functions to be used within the core files*/ ++void yaffs_chunk_del(struct yaffs_dev *dev, int chunk_id, int mark_flash, ++ int lyn); ++int yaffs_check_ff(u8 *buffer, int n_bytes); ++void yaffs_handle_chunk_error(struct yaffs_dev *dev, ++ struct yaffs_block_info *bi); ++ ++u8 *yaffs_get_temp_buffer(struct yaffs_dev *dev); ++void yaffs_release_temp_buffer(struct yaffs_dev *dev, u8 *buffer); ++ ++struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev, ++ int number, ++ enum yaffs_obj_type type); ++int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk, ++ int nand_chunk, int in_scan); ++void yaffs_set_obj_name(struct yaffs_obj *obj, const YCHAR *name); ++void yaffs_set_obj_name_from_oh(struct yaffs_obj *obj, ++ const struct yaffs_obj_hdr *oh); ++void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj); ++YCHAR *yaffs_clone_str(const YCHAR *str); ++void yaffs_link_fixup(struct yaffs_dev *dev, struct list_head *hard_list); ++void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no); ++int yaffs_update_oh(struct yaffs_obj *in, const YCHAR *name, ++ int force, int is_shrink, int shadows, ++ struct yaffs_xattr_mod *xop); ++void yaffs_handle_shadowed_obj(struct yaffs_dev *dev, int obj_id, ++ int backward_scanning); ++int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks); ++struct yaffs_tnode *yaffs_get_tnode(struct yaffs_dev *dev); ++struct yaffs_tnode *yaffs_add_find_tnode_0(struct yaffs_dev *dev, ++ struct yaffs_file_var *file_struct, ++ u32 chunk_id, ++ struct yaffs_tnode *passed_tn); ++ ++int yaffs_do_file_wr(struct yaffs_obj *in, const u8 *buffer, loff_t offset, ++ int n_bytes, int write_trhrough); ++void yaffs_resize_file_down(struct yaffs_obj *obj, loff_t new_size); ++void yaffs_skip_rest_of_block(struct yaffs_dev *dev); ++ ++int yaffs_count_free_chunks(struct yaffs_dev *dev); ++ ++struct yaffs_tnode *yaffs_find_tnode_0(struct yaffs_dev *dev, ++ struct yaffs_file_var *file_struct, ++ u32 chunk_id); ++ ++u32 yaffs_get_group_base(struct yaffs_dev *dev, struct yaffs_tnode *tn, ++ unsigned pos); ++ ++int yaffs_is_non_empty_dir(struct yaffs_obj *obj); ++ ++int yaffs_guts_format_dev(struct yaffs_dev *dev); ++ ++void yaffs_addr_to_chunk(struct yaffs_dev *dev, loff_t addr, ++ int *chunk_out, u32 *offset_out); ++/* ++ * Marshalling functions to get loff_t file sizes into aand out of ++ * object headers. ++ */ ++void yaffs_oh_size_load(struct yaffs_obj_hdr *oh, loff_t fsize); ++loff_t yaffs_oh_to_size(struct yaffs_obj_hdr *oh); ++loff_t yaffs_max_file_size(struct yaffs_dev *dev); ++ ++/* ++ * Debug function to count number of blocks in each state ++ * NB Needs to be called with correct number of integers ++ */ ++ ++void yaffs_count_blocks_by_state(struct yaffs_dev *dev, int bs[10]); ++ ++int yaffs_find_chunk_in_file(struct yaffs_obj *in, int inode_chunk, ++ struct yaffs_ext_tags *tags); ++ ++#endif +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_linux.h linux-3.15-rc5/fs/yaffs2/yaffs_linux.h +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_linux.h 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_linux.h 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,48 @@ ++/* ++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU Lesser General Public License version 2.1 as ++ * published by the Free Software Foundation. ++ * ++ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. ++ */ ++ ++#ifndef __YAFFS_LINUX_H__ ++#define __YAFFS_LINUX_H__ ++ ++#include "yportenv.h" ++ ++struct yaffs_linux_context { ++ struct list_head context_list; /* List of these we have mounted */ ++ struct yaffs_dev *dev; ++ struct super_block *super; ++ struct task_struct *bg_thread; /* Background thread for this device */ ++ int bg_running; ++ struct mutex gross_lock; /* Gross locking mutex*/ ++ u8 *spare_buffer; /* For mtdif2 use. Don't know the buffer size ++ * at compile time so we have to allocate it. ++ */ ++ struct list_head search_contexts; ++ struct task_struct *readdir_process; ++ unsigned mount_id; ++ int dirty; ++}; ++ ++#define yaffs_dev_to_lc(dev) ((struct yaffs_linux_context *)((dev)->os_context)) ++#define yaffs_dev_to_mtd(dev) ((struct mtd_info *)((dev)->driver_context)) ++ ++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17)) ++#define WRITE_SIZE_STR "writesize" ++#define WRITE_SIZE(mtd) ((mtd)->writesize) ++#else ++#define WRITE_SIZE_STR "oobblock" ++#define WRITE_SIZE(mtd) ((mtd)->oobblock) ++#endif ++ ++#endif +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_mtdif.c linux-3.15-rc5/fs/yaffs2/yaffs_mtdif.c +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_mtdif.c 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_mtdif.c 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,309 @@ ++/* ++ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU General Public License version 2 as ++ * published by the Free Software Foundation. ++ */ ++ ++#include "yportenv.h" ++ ++#include "yaffs_mtdif.h" ++ ++#include "linux/mtd/mtd.h" ++#include "linux/types.h" ++#include "linux/time.h" ++#include "linux/major.h" ++#include "linux/mtd/nand.h" ++#include "linux/kernel.h" ++#include "linux/version.h" ++#include "linux/types.h" ++ ++#include "yaffs_trace.h" ++#include "yaffs_guts.h" ++#include "yaffs_linux.h" ++ ++ ++#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 2, 0)) ++#define MTD_OPS_AUTO_OOB MTD_OOB_AUTO ++#endif ++ ++ ++#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0)) ++#define mtd_erase(m, ei) (m)->erase(m, ei) ++#define mtd_write_oob(m, addr, pops) (m)->write_oob(m, addr, pops) ++#define mtd_read_oob(m, addr, pops) (m)->read_oob(m, addr, pops) ++#define mtd_block_isbad(m, offs) (m)->block_isbad(m, offs) ++#define mtd_block_markbad(m, offs) (m)->block_markbad(m, offs) ++#endif ++ ++ ++ ++int nandmtd_erase_block(struct yaffs_dev *dev, int block_no) ++{ ++ struct mtd_info *mtd = yaffs_dev_to_mtd(dev); ++ u32 addr = ++ ((loff_t) block_no) * dev->param.total_bytes_per_chunk * ++ dev->param.chunks_per_block; ++ struct erase_info ei; ++ int retval = 0; ++ ++ ei.mtd = mtd; ++ ei.addr = addr; ++ ei.len = dev->param.total_bytes_per_chunk * dev->param.chunks_per_block; ++ ei.time = 1000; ++ ei.retries = 2; ++ ei.callback = NULL; ++ ei.priv = (u_long) dev; ++ ++ retval = mtd_erase(mtd, &ei); ++ ++ if (retval == 0) ++ return YAFFS_OK; ++ ++ return YAFFS_FAIL; ++} ++ ++ ++static int yaffs_mtd_write(struct yaffs_dev *dev, int nand_chunk, ++ const u8 *data, int data_len, ++ const u8 *oob, int oob_len) ++{ ++ struct mtd_info *mtd = yaffs_dev_to_mtd(dev); ++ loff_t addr; ++ struct mtd_oob_ops ops; ++ int retval; ++ ++ yaffs_trace(YAFFS_TRACE_MTD, ++ "yaffs_mtd_write(%p, %d, %p, %d, %p, %d)\n", ++ dev, nand_chunk, data, data_len, oob, oob_len); ++ ++ if (!data || !data_len) { ++ data = NULL; ++ data_len = 0; ++ } ++ ++ if (!oob || !oob_len) { ++ oob = NULL; ++ oob_len = 0; ++ } ++ ++ addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk; ++ memset(&ops, 0, sizeof(ops)); ++ ops.mode = MTD_OPS_AUTO_OOB; ++ ops.len = (data) ? data_len : 0; ++ ops.ooblen = oob_len; ++ ops.datbuf = (u8 *)data; ++ ops.oobbuf = (u8 *)oob; ++ ++ retval = mtd_write_oob(mtd, addr, &ops); ++ if (retval) { ++ yaffs_trace(YAFFS_TRACE_MTD, ++ "write_oob failed, chunk %d, mtd error %d", ++ nand_chunk, retval); ++ } ++ return retval ? YAFFS_FAIL : YAFFS_OK; ++} ++ ++static int yaffs_mtd_read(struct yaffs_dev *dev, int nand_chunk, ++ u8 *data, int data_len, ++ u8 *oob, int oob_len, ++ enum yaffs_ecc_result *ecc_result) ++{ ++ struct mtd_info *mtd = yaffs_dev_to_mtd(dev); ++ loff_t addr; ++ struct mtd_oob_ops ops; ++ int retval; ++ ++ addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk; ++ memset(&ops, 0, sizeof(ops)); ++ ops.mode = MTD_OPS_AUTO_OOB; ++ ops.len = (data) ? data_len : 0; ++ ops.ooblen = oob_len; ++ ops.datbuf = data; ++ ops.oobbuf = oob; ++ ++#if (MTD_VERSION_CODE < MTD_VERSION(2, 6, 20)) ++ /* In MTD 2.6.18 to 2.6.19 nand_base.c:nand_do_read_oob() has a bug; ++ * help it out with ops.len = ops.ooblen when ops.datbuf == NULL. ++ */ ++ ops.len = (ops.datbuf) ? ops.len : ops.ooblen; ++#endif ++ /* Read page and oob using MTD. ++ * Check status and determine ECC result. ++ */ ++ retval = mtd_read_oob(mtd, addr, &ops); ++ if (retval) ++ yaffs_trace(YAFFS_TRACE_MTD, ++ "read_oob failed, chunk %d, mtd error %d", ++ nand_chunk, retval); ++ ++ switch (retval) { ++ case 0: ++ /* no error */ ++ if(ecc_result) ++ *ecc_result = YAFFS_ECC_RESULT_NO_ERROR; ++ break; ++ ++ case -EUCLEAN: ++ /* MTD's ECC fixed the data */ ++ if(ecc_result) ++ *ecc_result = YAFFS_ECC_RESULT_FIXED; ++ dev->n_ecc_fixed++; ++ break; ++ ++ case -EBADMSG: ++ default: ++ /* MTD's ECC could not fix the data */ ++ dev->n_ecc_unfixed++; ++ if(ecc_result) ++ *ecc_result = YAFFS_ECC_RESULT_UNFIXED; ++ return YAFFS_FAIL; ++ } ++ ++ return YAFFS_OK; ++} ++ ++static int yaffs_mtd_erase(struct yaffs_dev *dev, int block_no) ++{ ++ struct mtd_info *mtd = yaffs_dev_to_mtd(dev); ++ ++ loff_t addr; ++ struct erase_info ei; ++ int retval = 0; ++ u32 block_size; ++ ++ block_size = dev->param.total_bytes_per_chunk * ++ dev->param.chunks_per_block; ++ addr = ((loff_t) block_no) * block_size; ++ ++ ei.mtd = mtd; ++ ei.addr = addr; ++ ei.len = block_size; ++ ei.time = 1000; ++ ei.retries = 2; ++ ei.callback = NULL; ++ ei.priv = (u_long) dev; ++ ++ retval = mtd_erase(mtd, &ei); ++ ++ if (retval == 0) ++ return YAFFS_OK; ++ ++ return YAFFS_FAIL; ++} ++ ++static int yaffs_mtd_mark_bad(struct yaffs_dev *dev, int block_no) ++{ ++ struct mtd_info *mtd = yaffs_dev_to_mtd(dev); ++ int blocksize = dev->param.chunks_per_block * dev->param.total_bytes_per_chunk; ++ int retval; ++ ++ yaffs_trace(YAFFS_TRACE_BAD_BLOCKS, "marking block %d bad", block_no); ++ ++ retval = mtd_block_markbad(mtd, (loff_t) blocksize * block_no); ++ return (retval) ? YAFFS_FAIL : YAFFS_OK; ++} ++ ++static int yaffs_mtd_check_bad(struct yaffs_dev *dev, int block_no) ++{ ++ struct mtd_info *mtd = yaffs_dev_to_mtd(dev); ++ int blocksize = dev->param.chunks_per_block * dev->param.total_bytes_per_chunk; ++ int retval; ++ ++ yaffs_trace(YAFFS_TRACE_MTD, "checking block %d bad", block_no); ++ ++ retval = mtd_block_isbad(mtd, (loff_t) blocksize * block_no); ++ return (retval) ? YAFFS_FAIL : YAFFS_OK; ++} ++ ++static int yaffs_mtd_initialise(struct yaffs_dev *dev) ++{ ++ return YAFFS_OK; ++} ++ ++static int yaffs_mtd_deinitialise(struct yaffs_dev *dev) ++{ ++ return YAFFS_OK; ++} ++ ++ ++void yaffs_mtd_drv_install(struct yaffs_dev *dev) ++{ ++ struct yaffs_driver *drv = &dev->drv; ++ ++ drv->drv_write_chunk_fn = yaffs_mtd_write; ++ drv->drv_read_chunk_fn = yaffs_mtd_read; ++ drv->drv_erase_fn = yaffs_mtd_erase; ++ drv->drv_mark_bad_fn = yaffs_mtd_mark_bad; ++ drv->drv_check_bad_fn = yaffs_mtd_check_bad; ++ drv->drv_initialise_fn = yaffs_mtd_initialise; ++ drv->drv_deinitialise_fn = yaffs_mtd_deinitialise; ++} ++ ++ ++struct mtd_info * yaffs_get_mtd_device(dev_t sdev) ++{ ++ struct mtd_info *mtd; ++ ++ mtd = yaffs_get_mtd_device(sdev); ++ ++ /* Check it's an mtd device..... */ ++ if (MAJOR(sdev) != MTD_BLOCK_MAJOR) ++ return NULL; /* This isn't an mtd device */ ++ ++ /* Check it's NAND */ ++ if (mtd->type != MTD_NANDFLASH) { ++ yaffs_trace(YAFFS_TRACE_ALWAYS, ++ "yaffs: MTD device is not NAND it's type %d", ++ mtd->type); ++ return NULL; ++ } ++ ++ yaffs_trace(YAFFS_TRACE_OS, " %s %d", WRITE_SIZE_STR, WRITE_SIZE(mtd)); ++ yaffs_trace(YAFFS_TRACE_OS, " oobsize %d", mtd->oobsize); ++ yaffs_trace(YAFFS_TRACE_OS, " erasesize %d", mtd->erasesize); ++#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29) ++ yaffs_trace(YAFFS_TRACE_OS, " size %u", mtd->size); ++#else ++ yaffs_trace(YAFFS_TRACE_OS, " size %lld", mtd->size); ++#endif ++ ++ return mtd; ++} ++ ++int yaffs_verify_mtd(struct mtd_info *mtd, int yaffs_version, int inband_tags) ++{ ++ if (yaffs_version == 2) { ++ if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE || ++ mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) && ++ !inband_tags) { ++ yaffs_trace(YAFFS_TRACE_ALWAYS, ++ "MTD device does not have the right page sizes" ++ ); ++ return -1; ++ } ++ } else { ++ if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK || ++ mtd->oobsize != YAFFS_BYTES_PER_SPARE) { ++ yaffs_trace(YAFFS_TRACE_ALWAYS, ++ "MTD device does not support have the right page sizes" ++ ); ++ return -1; ++ } ++ } ++ ++ return 0; ++} ++ ++ ++void yaffs_put_mtd_device(struct mtd_info *mtd) ++{ ++ if(mtd) ++ put_mtd_device(mtd); ++} +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_mtdif.h linux-3.15-rc5/fs/yaffs2/yaffs_mtdif.h +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_mtdif.h 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_mtdif.h 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,25 @@ ++/* ++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU Lesser General Public License version 2.1 as ++ * published by the Free Software Foundation. ++ * ++ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. ++ */ ++ ++#ifndef __YAFFS_MTDIF_H__ ++#define __YAFFS_MTDIF_H__ ++ ++#include "yaffs_guts.h" ++ ++void yaffs_mtd_drv_install(struct yaffs_dev *dev); ++struct mtd_info * yaffs_get_mtd_device(dev_t sdev); ++void yaffs_put_mtd_device(struct mtd_info *mtd); ++int yaffs_verify_mtd(struct mtd_info *mtd, int yaffs_version, int inband_tags); ++#endif +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_nameval.c linux-3.15-rc5/fs/yaffs2/yaffs_nameval.c +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_nameval.c 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_nameval.c 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,208 @@ ++/* ++ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU General Public License version 2 as ++ * published by the Free Software Foundation. ++ */ ++ ++/* ++ * This simple implementation of a name-value store assumes a small number of ++* values and fits into a small finite buffer. ++ * ++ * Each attribute is stored as a record: ++ * sizeof(int) bytes record size. ++ * strnlen+1 bytes name null terminated. ++ * nbytes value. ++ * ---------- ++ * total size stored in record size ++ * ++ * This code has not been tested with unicode yet. ++ */ ++ ++#include "yaffs_nameval.h" ++ ++#include "yportenv.h" ++ ++static int nval_find(const char *xb, int xb_size, const YCHAR *name, ++ int *exist_size) ++{ ++ int pos = 0; ++ int size; ++ ++ memcpy(&size, xb, sizeof(int)); ++ while (size > 0 && (size < xb_size) && (pos + size < xb_size)) { ++ if (!strncmp((YCHAR *) (xb + pos + sizeof(int)), ++ name, size)) { ++ if (exist_size) ++ *exist_size = size; ++ return pos; ++ } ++ pos += size; ++ if (pos < xb_size - sizeof(int)) ++ memcpy(&size, xb + pos, sizeof(int)); ++ else ++ size = 0; ++ } ++ if (exist_size) ++ *exist_size = 0; ++ return -ENODATA; ++} ++ ++static int nval_used(const char *xb, int xb_size) ++{ ++ int pos = 0; ++ int size; ++ ++ memcpy(&size, xb + pos, sizeof(int)); ++ while (size > 0 && (size < xb_size) && (pos + size < xb_size)) { ++ pos += size; ++ if (pos < xb_size - sizeof(int)) ++ memcpy(&size, xb + pos, sizeof(int)); ++ else ++ size = 0; ++ } ++ return pos; ++} ++ ++int nval_del(char *xb, int xb_size, const YCHAR *name) ++{ ++ int pos = nval_find(xb, xb_size, name, NULL); ++ int size; ++ ++ if (pos < 0 || pos >= xb_size) ++ return -ENODATA; ++ ++ /* Find size, shift rest over this record, ++ * then zero out the rest of buffer */ ++ memcpy(&size, xb + pos, sizeof(int)); ++ memcpy(xb + pos, xb + pos + size, xb_size - (pos + size)); ++ memset(xb + (xb_size - size), 0, size); ++ return 0; ++} ++ ++int nval_set(char *xb, int xb_size, const YCHAR *name, const char *buf, ++ int bsize, int flags) ++{ ++ int pos; ++ int namelen = strnlen(name, xb_size); ++ int reclen; ++ int size_exist = 0; ++ int space; ++ int start; ++ ++ pos = nval_find(xb, xb_size, name, &size_exist); ++ ++ if (flags & XATTR_CREATE && pos >= 0) ++ return -EEXIST; ++ if (flags & XATTR_REPLACE && pos < 0) ++ return -ENODATA; ++ ++ start = nval_used(xb, xb_size); ++ space = xb_size - start + size_exist; ++ ++ reclen = (sizeof(int) + namelen + 1 + bsize); ++ ++ if (reclen > space) ++ return -ENOSPC; ++ ++ if (pos >= 0) { ++ nval_del(xb, xb_size, name); ++ start = nval_used(xb, xb_size); ++ } ++ ++ pos = start; ++ ++ memcpy(xb + pos, &reclen, sizeof(int)); ++ pos += sizeof(int); ++ strncpy((YCHAR *) (xb + pos), name, reclen); ++ pos += (namelen + 1); ++ memcpy(xb + pos, buf, bsize); ++ return 0; ++} ++ ++int nval_get(const char *xb, int xb_size, const YCHAR * name, char *buf, ++ int bsize) ++{ ++ int pos = nval_find(xb, xb_size, name, NULL); ++ int size; ++ ++ if (pos >= 0 && pos < xb_size) { ++ ++ memcpy(&size, xb + pos, sizeof(int)); ++ pos += sizeof(int); /* advance past record length */ ++ size -= sizeof(int); ++ ++ /* Advance over name string */ ++ while (xb[pos] && size > 0 && pos < xb_size) { ++ pos++; ++ size--; ++ } ++ /*Advance over NUL */ ++ pos++; ++ size--; ++ ++ /* If bsize is zero then this is a size query. ++ * Return the size, but don't copy. ++ */ ++ if (!bsize) ++ return size; ++ ++ if (size <= bsize) { ++ memcpy(buf, xb + pos, size); ++ return size; ++ } ++ } ++ if (pos >= 0) ++ return -ERANGE; ++ ++ return -ENODATA; ++} ++ ++int nval_list(const char *xb, int xb_size, char *buf, int bsize) ++{ ++ int pos = 0; ++ int size; ++ int name_len; ++ int ncopied = 0; ++ int filled = 0; ++ ++ memcpy(&size, xb + pos, sizeof(int)); ++ while (size > sizeof(int) && ++ size <= xb_size && ++ (pos + size) < xb_size && ++ !filled) { ++ pos += sizeof(int); ++ size -= sizeof(int); ++ name_len = strnlen((YCHAR *) (xb + pos), size); ++ if (ncopied + name_len + 1 < bsize) { ++ memcpy(buf, xb + pos, name_len * sizeof(YCHAR)); ++ buf += name_len; ++ *buf = '\0'; ++ buf++; ++ if (sizeof(YCHAR) > 1) { ++ *buf = '\0'; ++ buf++; ++ } ++ ncopied += (name_len + 1); ++ } else { ++ filled = 1; ++ } ++ pos += size; ++ if (pos < xb_size - sizeof(int)) ++ memcpy(&size, xb + pos, sizeof(int)); ++ else ++ size = 0; ++ } ++ return ncopied; ++} ++ ++int nval_hasvalues(const char *xb, int xb_size) ++{ ++ return nval_used(xb, xb_size) > 0; ++} +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_nameval.h linux-3.15-rc5/fs/yaffs2/yaffs_nameval.h +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_nameval.h 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_nameval.h 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,28 @@ ++/* ++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU Lesser General Public License version 2.1 as ++ * published by the Free Software Foundation. ++ * ++ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. ++ */ ++ ++#ifndef __NAMEVAL_H__ ++#define __NAMEVAL_H__ ++ ++#include "yportenv.h" ++ ++int nval_del(char *xb, int xb_size, const YCHAR * name); ++int nval_set(char *xb, int xb_size, const YCHAR * name, const char *buf, ++ int bsize, int flags); ++int nval_get(const char *xb, int xb_size, const YCHAR * name, char *buf, ++ int bsize); ++int nval_list(const char *xb, int xb_size, char *buf, int bsize); ++int nval_hasvalues(const char *xb, int xb_size); ++#endif +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_nand.c linux-3.15-rc5/fs/yaffs2/yaffs_nand.c +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_nand.c 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_nand.c 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,122 @@ ++/* ++ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU General Public License version 2 as ++ * published by the Free Software Foundation. ++ */ ++ ++#include "yaffs_nand.h" ++#include "yaffs_tagscompat.h" ++ ++#include "yaffs_getblockinfo.h" ++#include "yaffs_summary.h" ++ ++static int apply_chunk_offset(struct yaffs_dev *dev, int chunk) ++{ ++ return chunk - dev->chunk_offset; ++} ++ ++int yaffs_rd_chunk_tags_nand(struct yaffs_dev *dev, int nand_chunk, ++ u8 *buffer, struct yaffs_ext_tags *tags) ++{ ++ int result; ++ struct yaffs_ext_tags local_tags; ++ int flash_chunk = apply_chunk_offset(dev, nand_chunk); ++ ++ dev->n_page_reads++; ++ ++ /* If there are no tags provided use local tags. */ ++ if (!tags) ++ tags = &local_tags; ++ ++ result = dev->tagger.read_chunk_tags_fn(dev, flash_chunk, buffer, tags); ++ if (tags && tags->ecc_result > YAFFS_ECC_RESULT_NO_ERROR) { ++ ++ struct yaffs_block_info *bi; ++ bi = yaffs_get_block_info(dev, ++ nand_chunk / ++ dev->param.chunks_per_block); ++ yaffs_handle_chunk_error(dev, bi); ++ } ++ return result; ++} ++ ++int yaffs_wr_chunk_tags_nand(struct yaffs_dev *dev, ++ int nand_chunk, ++ const u8 *buffer, struct yaffs_ext_tags *tags) ++{ ++ int result; ++ int flash_chunk = apply_chunk_offset(dev, nand_chunk); ++ ++ dev->n_page_writes++; ++ ++ if (!tags) { ++ yaffs_trace(YAFFS_TRACE_ERROR, "Writing with no tags"); ++ BUG(); ++ return YAFFS_FAIL; ++ } ++ ++ tags->seq_number = dev->seq_number; ++ tags->chunk_used = 1; ++ yaffs_trace(YAFFS_TRACE_WRITE, ++ "Writing chunk %d tags %d %d", ++ nand_chunk, tags->obj_id, tags->chunk_id); ++ ++ result = dev->tagger.write_chunk_tags_fn(dev, flash_chunk, ++ buffer, tags); ++ ++ yaffs_summary_add(dev, tags, nand_chunk); ++ ++ return result; ++} ++ ++int yaffs_mark_bad(struct yaffs_dev *dev, int block_no) ++{ ++ block_no -= dev->block_offset; ++ dev->n_bad_markings++; ++ ++ if (dev->param.disable_bad_block_marking) ++ return YAFFS_OK; ++ ++ return dev->tagger.mark_bad_fn(dev, block_no); ++} ++ ++ ++int yaffs_query_init_block_state(struct yaffs_dev *dev, ++ int block_no, ++ enum yaffs_block_state *state, ++ u32 *seq_number) ++{ ++ block_no -= dev->block_offset; ++ return dev->tagger.query_block_fn(dev, block_no, state, seq_number); ++} ++ ++int yaffs_erase_block(struct yaffs_dev *dev, int block_no) ++{ ++ int result; ++ ++ block_no -= dev->block_offset; ++ dev->n_erasures++; ++ result = dev->drv.drv_erase_fn(dev, block_no); ++ return result; ++} ++ ++int yaffs_init_nand(struct yaffs_dev *dev) ++{ ++ if (dev->drv.drv_initialise_fn) ++ return dev->drv.drv_initialise_fn(dev); ++ return YAFFS_OK; ++} ++ ++int yaffs_deinit_nand(struct yaffs_dev *dev) ++{ ++ if (dev->drv.drv_deinitialise_fn) ++ return dev->drv.drv_deinitialise_fn(dev); ++ return YAFFS_OK; ++} +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_nand.h linux-3.15-rc5/fs/yaffs2/yaffs_nand.h +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_nand.h 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_nand.h 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,39 @@ ++/* ++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU Lesser General Public License version 2.1 as ++ * published by the Free Software Foundation. ++ * ++ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. ++ */ ++ ++#ifndef __YAFFS_NAND_H__ ++#define __YAFFS_NAND_H__ ++#include "yaffs_guts.h" ++ ++int yaffs_rd_chunk_tags_nand(struct yaffs_dev *dev, int nand_chunk, ++ u8 *buffer, struct yaffs_ext_tags *tags); ++ ++int yaffs_wr_chunk_tags_nand(struct yaffs_dev *dev, ++ int nand_chunk, ++ const u8 *buffer, struct yaffs_ext_tags *tags); ++ ++int yaffs_mark_bad(struct yaffs_dev *dev, int block_no); ++ ++int yaffs_query_init_block_state(struct yaffs_dev *dev, ++ int block_no, ++ enum yaffs_block_state *state, ++ unsigned *seq_number); ++ ++int yaffs_erase_block(struct yaffs_dev *dev, int flash_block); ++ ++int yaffs_init_nand(struct yaffs_dev *dev); ++int yaffs_deinit_nand(struct yaffs_dev *dev); ++ ++#endif +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_packedtags1.c linux-3.15-rc5/fs/yaffs2/yaffs_packedtags1.c +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_packedtags1.c 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_packedtags1.c 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,56 @@ ++/* ++ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU General Public License version 2 as ++ * published by the Free Software Foundation. ++ */ ++ ++#include "yaffs_packedtags1.h" ++#include "yportenv.h" ++ ++static const u8 all_ff[20] = { ++ 0xff, 0xff, 0xff, 0xff, ++ 0xff, 0xff, 0xff, 0xff, ++ 0xff, 0xff, 0xff, 0xff, ++ 0xff, 0xff, 0xff, 0xff, ++ 0xff, 0xff, 0xff, 0xff ++}; ++ ++void yaffs_pack_tags1(struct yaffs_packed_tags1 *pt, ++ const struct yaffs_ext_tags *t) ++{ ++ pt->chunk_id = t->chunk_id; ++ pt->serial_number = t->serial_number; ++ pt->n_bytes = t->n_bytes; ++ pt->obj_id = t->obj_id; ++ pt->ecc = 0; ++ pt->deleted = (t->is_deleted) ? 0 : 1; ++ pt->unused_stuff = 0; ++ pt->should_be_ff = 0xffffffff; ++} ++ ++void yaffs_unpack_tags1(struct yaffs_ext_tags *t, ++ const struct yaffs_packed_tags1 *pt) ++{ ++ ++ if (memcmp(all_ff, pt, sizeof(struct yaffs_packed_tags1))) { ++ t->block_bad = 0; ++ if (pt->should_be_ff != 0xffffffff) ++ t->block_bad = 1; ++ t->chunk_used = 1; ++ t->obj_id = pt->obj_id; ++ t->chunk_id = pt->chunk_id; ++ t->n_bytes = pt->n_bytes; ++ t->ecc_result = YAFFS_ECC_RESULT_NO_ERROR; ++ t->is_deleted = (pt->deleted) ? 0 : 1; ++ t->serial_number = pt->serial_number; ++ } else { ++ memset(t, 0, sizeof(struct yaffs_ext_tags)); ++ } ++} +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_packedtags1.h linux-3.15-rc5/fs/yaffs2/yaffs_packedtags1.h +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_packedtags1.h 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_packedtags1.h 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,39 @@ ++/* ++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU Lesser General Public License version 2.1 as ++ * published by the Free Software Foundation. ++ * ++ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. ++ */ ++ ++/* This is used to pack YAFFS1 tags, not YAFFS2 tags. */ ++ ++#ifndef __YAFFS_PACKEDTAGS1_H__ ++#define __YAFFS_PACKEDTAGS1_H__ ++ ++#include "yaffs_guts.h" ++ ++struct yaffs_packed_tags1 { ++ u32 chunk_id:20; ++ u32 serial_number:2; ++ u32 n_bytes:10; ++ u32 obj_id:18; ++ u32 ecc:12; ++ u32 deleted:1; ++ u32 unused_stuff:1; ++ unsigned should_be_ff; ++ ++}; ++ ++void yaffs_pack_tags1(struct yaffs_packed_tags1 *pt, ++ const struct yaffs_ext_tags *t); ++void yaffs_unpack_tags1(struct yaffs_ext_tags *t, ++ const struct yaffs_packed_tags1 *pt); ++#endif +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_packedtags2.c linux-3.15-rc5/fs/yaffs2/yaffs_packedtags2.c +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_packedtags2.c 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_packedtags2.c 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,197 @@ ++/* ++ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU General Public License version 2 as ++ * published by the Free Software Foundation. ++ */ ++ ++#include "yaffs_packedtags2.h" ++#include "yportenv.h" ++#include "yaffs_trace.h" ++ ++/* This code packs a set of extended tags into a binary structure for ++ * NAND storage ++ */ ++ ++/* Some of the information is "extra" struff which can be packed in to ++ * speed scanning ++ * This is defined by having the EXTRA_HEADER_INFO_FLAG set. ++ */ ++ ++/* Extra flags applied to chunk_id */ ++ ++#define EXTRA_HEADER_INFO_FLAG 0x80000000 ++#define EXTRA_SHRINK_FLAG 0x40000000 ++#define EXTRA_SHADOWS_FLAG 0x20000000 ++#define EXTRA_SPARE_FLAGS 0x10000000 ++ ++#define ALL_EXTRA_FLAGS 0xf0000000 ++ ++/* Also, the top 4 bits of the object Id are set to the object type. */ ++#define EXTRA_OBJECT_TYPE_SHIFT (28) ++#define EXTRA_OBJECT_TYPE_MASK ((0x0f) << EXTRA_OBJECT_TYPE_SHIFT) ++ ++static void yaffs_dump_packed_tags2_tags_only( ++ const struct yaffs_packed_tags2_tags_only *ptt) ++{ ++ yaffs_trace(YAFFS_TRACE_MTD, ++ "packed tags obj %d chunk %d byte %d seq %d", ++ ptt->obj_id, ptt->chunk_id, ptt->n_bytes, ptt->seq_number); ++} ++ ++static void yaffs_dump_packed_tags2(const struct yaffs_packed_tags2 *pt) ++{ ++ yaffs_dump_packed_tags2_tags_only(&pt->t); ++} ++ ++static void yaffs_dump_tags2(const struct yaffs_ext_tags *t) ++{ ++ yaffs_trace(YAFFS_TRACE_MTD, ++ "ext.tags eccres %d blkbad %d chused %d obj %d chunk%d byte %d del %d ser %d seq %d", ++ t->ecc_result, t->block_bad, t->chunk_used, t->obj_id, ++ t->chunk_id, t->n_bytes, t->is_deleted, t->serial_number, ++ t->seq_number); ++ ++} ++ ++static int yaffs_check_tags_extra_packable(const struct yaffs_ext_tags *t) ++{ ++ if (t->chunk_id != 0 || !t->extra_available) ++ return 0; ++ ++ /* Check if the file size is too long to store */ ++ if (t->extra_obj_type == YAFFS_OBJECT_TYPE_FILE && ++ (t->extra_file_size >> 31) != 0) ++ return 0; ++ return 1; ++} ++ ++void yaffs_pack_tags2_tags_only(struct yaffs_packed_tags2_tags_only *ptt, ++ const struct yaffs_ext_tags *t) ++{ ++ ptt->chunk_id = t->chunk_id; ++ ptt->seq_number = t->seq_number; ++ ptt->n_bytes = t->n_bytes; ++ ptt->obj_id = t->obj_id; ++ ++ /* Only store extra tags for object headers. ++ * If it is a file then only store if the file size is short\ ++ * enough to fit. ++ */ ++ if (yaffs_check_tags_extra_packable(t)) { ++ /* Store the extra header info instead */ ++ /* We save the parent object in the chunk_id */ ++ ptt->chunk_id = EXTRA_HEADER_INFO_FLAG | t->extra_parent_id; ++ if (t->extra_is_shrink) ++ ptt->chunk_id |= EXTRA_SHRINK_FLAG; ++ if (t->extra_shadows) ++ ptt->chunk_id |= EXTRA_SHADOWS_FLAG; ++ ++ ptt->obj_id &= ~EXTRA_OBJECT_TYPE_MASK; ++ ptt->obj_id |= (t->extra_obj_type << EXTRA_OBJECT_TYPE_SHIFT); ++ ++ if (t->extra_obj_type == YAFFS_OBJECT_TYPE_HARDLINK) ++ ptt->n_bytes = t->extra_equiv_id; ++ else if (t->extra_obj_type == YAFFS_OBJECT_TYPE_FILE) ++ ptt->n_bytes = (unsigned) t->extra_file_size; ++ else ++ ptt->n_bytes = 0; ++ } ++ ++ yaffs_dump_packed_tags2_tags_only(ptt); ++ yaffs_dump_tags2(t); ++} ++ ++void yaffs_pack_tags2(struct yaffs_packed_tags2 *pt, ++ const struct yaffs_ext_tags *t, int tags_ecc) ++{ ++ yaffs_pack_tags2_tags_only(&pt->t, t); ++ ++ if (tags_ecc) ++ yaffs_ecc_calc_other((unsigned char *)&pt->t, ++ sizeof(struct yaffs_packed_tags2_tags_only), ++ &pt->ecc); ++} ++ ++void yaffs_unpack_tags2_tags_only(struct yaffs_ext_tags *t, ++ struct yaffs_packed_tags2_tags_only *ptt) ++{ ++ memset(t, 0, sizeof(struct yaffs_ext_tags)); ++ ++ if (ptt->seq_number == 0xffffffff) ++ return; ++ ++ t->block_bad = 0; ++ t->chunk_used = 1; ++ t->obj_id = ptt->obj_id; ++ t->chunk_id = ptt->chunk_id; ++ t->n_bytes = ptt->n_bytes; ++ t->is_deleted = 0; ++ t->serial_number = 0; ++ t->seq_number = ptt->seq_number; ++ ++ /* Do extra header info stuff */ ++ if (ptt->chunk_id & EXTRA_HEADER_INFO_FLAG) { ++ t->chunk_id = 0; ++ t->n_bytes = 0; ++ ++ t->extra_available = 1; ++ t->extra_parent_id = ptt->chunk_id & (~(ALL_EXTRA_FLAGS)); ++ t->extra_is_shrink = ptt->chunk_id & EXTRA_SHRINK_FLAG ? 1 : 0; ++ t->extra_shadows = ptt->chunk_id & EXTRA_SHADOWS_FLAG ? 1 : 0; ++ t->extra_obj_type = ptt->obj_id >> EXTRA_OBJECT_TYPE_SHIFT; ++ t->obj_id &= ~EXTRA_OBJECT_TYPE_MASK; ++ ++ if (t->extra_obj_type == YAFFS_OBJECT_TYPE_HARDLINK) ++ t->extra_equiv_id = ptt->n_bytes; ++ else ++ t->extra_file_size = ptt->n_bytes; ++ } ++ yaffs_dump_packed_tags2_tags_only(ptt); ++ yaffs_dump_tags2(t); ++} ++ ++void yaffs_unpack_tags2(struct yaffs_ext_tags *t, struct yaffs_packed_tags2 *pt, ++ int tags_ecc) ++{ ++ enum yaffs_ecc_result ecc_result = YAFFS_ECC_RESULT_NO_ERROR; ++ ++ if (pt->t.seq_number != 0xffffffff && tags_ecc) { ++ /* Chunk is in use and we need to do ECC */ ++ ++ struct yaffs_ecc_other ecc; ++ int result; ++ yaffs_ecc_calc_other((unsigned char *)&pt->t, ++ sizeof(struct yaffs_packed_tags2_tags_only), ++ &ecc); ++ result = ++ yaffs_ecc_correct_other((unsigned char *)&pt->t, ++ sizeof(struct yaffs_packed_tags2_tags_only), ++ &pt->ecc, &ecc); ++ switch (result) { ++ case 0: ++ ecc_result = YAFFS_ECC_RESULT_NO_ERROR; ++ break; ++ case 1: ++ ecc_result = YAFFS_ECC_RESULT_FIXED; ++ break; ++ case -1: ++ ecc_result = YAFFS_ECC_RESULT_UNFIXED; ++ break; ++ default: ++ ecc_result = YAFFS_ECC_RESULT_UNKNOWN; ++ } ++ } ++ yaffs_unpack_tags2_tags_only(t, &pt->t); ++ ++ t->ecc_result = ecc_result; ++ ++ yaffs_dump_packed_tags2(pt); ++ yaffs_dump_tags2(t); ++} +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_packedtags2.h linux-3.15-rc5/fs/yaffs2/yaffs_packedtags2.h +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_packedtags2.h 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_packedtags2.h 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,47 @@ ++/* ++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU Lesser General Public License version 2.1 as ++ * published by the Free Software Foundation. ++ * ++ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. ++ */ ++ ++/* This is used to pack YAFFS2 tags, not YAFFS1tags. */ ++ ++#ifndef __YAFFS_PACKEDTAGS2_H__ ++#define __YAFFS_PACKEDTAGS2_H__ ++ ++#include "yaffs_guts.h" ++#include "yaffs_ecc.h" ++ ++struct yaffs_packed_tags2_tags_only { ++ unsigned seq_number; ++ unsigned obj_id; ++ unsigned chunk_id; ++ unsigned n_bytes; ++}; ++ ++struct yaffs_packed_tags2 { ++ struct yaffs_packed_tags2_tags_only t; ++ struct yaffs_ecc_other ecc; ++}; ++ ++/* Full packed tags with ECC, used for oob tags */ ++void yaffs_pack_tags2(struct yaffs_packed_tags2 *pt, ++ const struct yaffs_ext_tags *t, int tags_ecc); ++void yaffs_unpack_tags2(struct yaffs_ext_tags *t, struct yaffs_packed_tags2 *pt, ++ int tags_ecc); ++ ++/* Only the tags part (no ECC for use with inband tags */ ++void yaffs_pack_tags2_tags_only(struct yaffs_packed_tags2_tags_only *pt, ++ const struct yaffs_ext_tags *t); ++void yaffs_unpack_tags2_tags_only(struct yaffs_ext_tags *t, ++ struct yaffs_packed_tags2_tags_only *pt); ++#endif +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_summary.c linux-3.15-rc5/fs/yaffs2/yaffs_summary.c +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_summary.c 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_summary.c 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,312 @@ ++/* ++ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU General Public License version 2 as ++ * published by the Free Software Foundation. ++ */ ++ ++/* Summaries write the useful part of the tags for the chunks in a block into an ++ * an array which is written to the last n chunks of the block. ++ * Reading the summaries gives all the tags for the block in one read. Much ++ * faster. ++ * ++ * Chunks holding summaries are marked with tags making it look like ++ * they are part of a fake file. ++ * ++ * The summary could also be used during gc. ++ * ++ */ ++ ++#include "yaffs_summary.h" ++#include "yaffs_packedtags2.h" ++#include "yaffs_nand.h" ++#include "yaffs_getblockinfo.h" ++#include "yaffs_bitmap.h" ++ ++/* ++ * The summary is built up in an array of summary tags. ++ * This gets written to the last one or two (maybe more) chunks in a block. ++ * A summary header is written as the first part of each chunk of summary data. ++ * The summary header must match or the summary is rejected. ++ */ ++ ++/* Summary tags don't need the sequence number because that is redundant. */ ++struct yaffs_summary_tags { ++ unsigned obj_id; ++ unsigned chunk_id; ++ unsigned n_bytes; ++}; ++ ++/* Summary header */ ++struct yaffs_summary_header { ++ unsigned version; /* Must match current version */ ++ unsigned block; /* Must be this block */ ++ unsigned seq; /* Must be this sequence number */ ++ unsigned sum; /* Just add up all the bytes in the tags */ ++}; ++ ++ ++static void yaffs_summary_clear(struct yaffs_dev *dev) ++{ ++ if (!dev->sum_tags) ++ return; ++ memset(dev->sum_tags, 0, dev->chunks_per_summary * ++ sizeof(struct yaffs_summary_tags)); ++} ++ ++ ++void yaffs_summary_deinit(struct yaffs_dev *dev) ++{ ++ kfree(dev->sum_tags); ++ dev->sum_tags = NULL; ++ kfree(dev->gc_sum_tags); ++ dev->gc_sum_tags = NULL; ++ dev->chunks_per_summary = 0; ++} ++ ++int yaffs_summary_init(struct yaffs_dev *dev) ++{ ++ int sum_bytes; ++ int chunks_used; /* Number of chunks used by summary */ ++ int sum_tags_bytes; ++ ++ sum_bytes = dev->param.chunks_per_block * ++ sizeof(struct yaffs_summary_tags); ++ ++ chunks_used = (sum_bytes + dev->data_bytes_per_chunk - 1)/ ++ (dev->data_bytes_per_chunk - ++ sizeof(struct yaffs_summary_header)); ++ ++ dev->chunks_per_summary = dev->param.chunks_per_block - chunks_used; ++ sum_tags_bytes = sizeof(struct yaffs_summary_tags) * ++ dev->chunks_per_summary; ++ dev->sum_tags = kmalloc(sum_tags_bytes, GFP_NOFS); ++ dev->gc_sum_tags = kmalloc(sum_tags_bytes, GFP_NOFS); ++ if (!dev->sum_tags || !dev->gc_sum_tags) { ++ yaffs_summary_deinit(dev); ++ return YAFFS_FAIL; ++ } ++ ++ yaffs_summary_clear(dev); ++ ++ return YAFFS_OK; ++} ++ ++static unsigned yaffs_summary_sum(struct yaffs_dev *dev) ++{ ++ u8 *sum_buffer = (u8 *)dev->sum_tags; ++ int i; ++ unsigned sum = 0; ++ ++ i = sizeof(struct yaffs_summary_tags) * ++ dev->chunks_per_summary; ++ while (i > 0) { ++ sum += *sum_buffer; ++ sum_buffer++; ++ i--; ++ } ++ ++ return sum; ++} ++ ++static int yaffs_summary_write(struct yaffs_dev *dev, int blk) ++{ ++ struct yaffs_ext_tags tags; ++ u8 *buffer; ++ u8 *sum_buffer = (u8 *)dev->sum_tags; ++ int n_bytes; ++ int chunk_in_nand; ++ int chunk_in_block; ++ int result; ++ int this_tx; ++ struct yaffs_summary_header hdr; ++ int sum_bytes_per_chunk = dev->data_bytes_per_chunk - sizeof(hdr); ++ struct yaffs_block_info *bi = yaffs_get_block_info(dev, blk); ++ ++ buffer = yaffs_get_temp_buffer(dev); ++ n_bytes = sizeof(struct yaffs_summary_tags) * ++ dev->chunks_per_summary; ++ memset(&tags, 0, sizeof(struct yaffs_ext_tags)); ++ tags.obj_id = YAFFS_OBJECTID_SUMMARY; ++ tags.chunk_id = 1; ++ chunk_in_block = dev->chunks_per_summary; ++ chunk_in_nand = dev->alloc_block * dev->param.chunks_per_block + ++ dev->chunks_per_summary; ++ hdr.version = YAFFS_SUMMARY_VERSION; ++ hdr.block = blk; ++ hdr.seq = bi->seq_number; ++ hdr.sum = yaffs_summary_sum(dev); ++ ++ do { ++ this_tx = n_bytes; ++ if (this_tx > sum_bytes_per_chunk) ++ this_tx = sum_bytes_per_chunk; ++ memcpy(buffer, &hdr, sizeof(hdr)); ++ memcpy(buffer + sizeof(hdr), sum_buffer, this_tx); ++ tags.n_bytes = this_tx + sizeof(hdr); ++ result = yaffs_wr_chunk_tags_nand(dev, chunk_in_nand, ++ buffer, &tags); ++ ++ if (result != YAFFS_OK) ++ break; ++ yaffs_set_chunk_bit(dev, blk, chunk_in_block); ++ bi->pages_in_use++; ++ dev->n_free_chunks--; ++ ++ n_bytes -= this_tx; ++ sum_buffer += this_tx; ++ chunk_in_nand++; ++ chunk_in_block++; ++ tags.chunk_id++; ++ } while (result == YAFFS_OK && n_bytes > 0); ++ yaffs_release_temp_buffer(dev, buffer); ++ ++ ++ if (result == YAFFS_OK) ++ bi->has_summary = 1; ++ ++ ++ return result; ++} ++ ++int yaffs_summary_read(struct yaffs_dev *dev, ++ struct yaffs_summary_tags *st, ++ int blk) ++{ ++ struct yaffs_ext_tags tags; ++ u8 *buffer; ++ u8 *sum_buffer = (u8 *)st; ++ int n_bytes; ++ int chunk_id; ++ int chunk_in_nand; ++ int chunk_in_block; ++ int result; ++ int this_tx; ++ struct yaffs_summary_header hdr; ++ struct yaffs_block_info *bi = yaffs_get_block_info(dev, blk); ++ int sum_bytes_per_chunk = dev->data_bytes_per_chunk - sizeof(hdr); ++ int sum_tags_bytes; ++ ++ sum_tags_bytes = sizeof(struct yaffs_summary_tags) * ++ dev->chunks_per_summary; ++ buffer = yaffs_get_temp_buffer(dev); ++ n_bytes = sizeof(struct yaffs_summary_tags) * dev->chunks_per_summary; ++ chunk_in_block = dev->chunks_per_summary; ++ chunk_in_nand = blk * dev->param.chunks_per_block + ++ dev->chunks_per_summary; ++ chunk_id = 1; ++ do { ++ this_tx = n_bytes; ++ if (this_tx > sum_bytes_per_chunk) ++ this_tx = sum_bytes_per_chunk; ++ result = yaffs_rd_chunk_tags_nand(dev, chunk_in_nand, ++ buffer, &tags); ++ ++ if (tags.chunk_id != chunk_id || ++ tags.obj_id != YAFFS_OBJECTID_SUMMARY || ++ tags.chunk_used == 0 || ++ tags.ecc_result > YAFFS_ECC_RESULT_FIXED || ++ tags.n_bytes != (this_tx + sizeof(hdr))) ++ result = YAFFS_FAIL; ++ if (result != YAFFS_OK) ++ break; ++ ++ if (st == dev->sum_tags) { ++ /* If we're scanning then update the block info */ ++ yaffs_set_chunk_bit(dev, blk, chunk_in_block); ++ bi->pages_in_use++; ++ } ++ memcpy(&hdr, buffer, sizeof(hdr)); ++ memcpy(sum_buffer, buffer + sizeof(hdr), this_tx); ++ n_bytes -= this_tx; ++ sum_buffer += this_tx; ++ chunk_in_nand++; ++ chunk_in_block++; ++ chunk_id++; ++ } while (result == YAFFS_OK && n_bytes > 0); ++ yaffs_release_temp_buffer(dev, buffer); ++ ++ if (result == YAFFS_OK) { ++ /* Verify header */ ++ if (hdr.version != YAFFS_SUMMARY_VERSION || ++ hdr.seq != bi->seq_number || ++ hdr.sum != yaffs_summary_sum(dev)) ++ result = YAFFS_FAIL; ++ } ++ ++ if (st == dev->sum_tags && result == YAFFS_OK) ++ bi->has_summary = 1; ++ ++ return result; ++} ++ ++int yaffs_summary_add(struct yaffs_dev *dev, ++ struct yaffs_ext_tags *tags, ++ int chunk_in_nand) ++{ ++ struct yaffs_packed_tags2_tags_only tags_only; ++ struct yaffs_summary_tags *sum_tags; ++ int block_in_nand = chunk_in_nand / dev->param.chunks_per_block; ++ int chunk_in_block = chunk_in_nand % dev->param.chunks_per_block; ++ ++ if (!dev->sum_tags) ++ return YAFFS_OK; ++ ++ if (chunk_in_block >= 0 && chunk_in_block < dev->chunks_per_summary) { ++ yaffs_pack_tags2_tags_only(&tags_only, tags); ++ sum_tags = &dev->sum_tags[chunk_in_block]; ++ sum_tags->chunk_id = tags_only.chunk_id; ++ sum_tags->n_bytes = tags_only.n_bytes; ++ sum_tags->obj_id = tags_only.obj_id; ++ ++ if (chunk_in_block == dev->chunks_per_summary - 1) { ++ /* Time to write out the summary */ ++ yaffs_summary_write(dev, block_in_nand); ++ yaffs_summary_clear(dev); ++ yaffs_skip_rest_of_block(dev); ++ } ++ } ++ return YAFFS_OK; ++} ++ ++int yaffs_summary_fetch(struct yaffs_dev *dev, ++ struct yaffs_ext_tags *tags, ++ int chunk_in_block) ++{ ++ struct yaffs_packed_tags2_tags_only tags_only; ++ struct yaffs_summary_tags *sum_tags; ++ if (chunk_in_block >= 0 && chunk_in_block < dev->chunks_per_summary) { ++ sum_tags = &dev->sum_tags[chunk_in_block]; ++ tags_only.chunk_id = sum_tags->chunk_id; ++ tags_only.n_bytes = sum_tags->n_bytes; ++ tags_only.obj_id = sum_tags->obj_id; ++ yaffs_unpack_tags2_tags_only(tags, &tags_only); ++ return YAFFS_OK; ++ } ++ return YAFFS_FAIL; ++} ++ ++void yaffs_summary_gc(struct yaffs_dev *dev, int blk) ++{ ++ struct yaffs_block_info *bi = yaffs_get_block_info(dev, blk); ++ int i; ++ ++ if (!bi->has_summary) ++ return; ++ ++ for (i = dev->chunks_per_summary; ++ i < dev->param.chunks_per_block; ++ i++) { ++ if (yaffs_check_chunk_bit(dev, blk, i)) { ++ yaffs_clear_chunk_bit(dev, blk, i); ++ bi->pages_in_use--; ++ dev->n_free_chunks++; ++ } ++ } ++} +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_summary.h linux-3.15-rc5/fs/yaffs2/yaffs_summary.h +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_summary.h 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_summary.h 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,37 @@ ++/* ++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU Lesser General Public License version 2.1 as ++ * published by the Free Software Foundation. ++ * ++ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. ++ */ ++ ++#ifndef __YAFFS_SUMMARY_H__ ++#define __YAFFS_SUMMARY_H__ ++ ++#include "yaffs_packedtags2.h" ++ ++ ++int yaffs_summary_init(struct yaffs_dev *dev); ++void yaffs_summary_deinit(struct yaffs_dev *dev); ++ ++int yaffs_summary_add(struct yaffs_dev *dev, ++ struct yaffs_ext_tags *tags, ++ int chunk_in_block); ++int yaffs_summary_fetch(struct yaffs_dev *dev, ++ struct yaffs_ext_tags *tags, ++ int chunk_in_block); ++int yaffs_summary_read(struct yaffs_dev *dev, ++ struct yaffs_summary_tags *st, ++ int blk); ++void yaffs_summary_gc(struct yaffs_dev *dev, int blk); ++ ++ ++#endif +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_tagscompat.c linux-3.15-rc5/fs/yaffs2/yaffs_tagscompat.c +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_tagscompat.c 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_tagscompat.c 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,381 @@ ++/* ++ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU General Public License version 2 as ++ * published by the Free Software Foundation. ++ */ ++ ++#include "yaffs_guts.h" ++#include "yaffs_tagscompat.h" ++#include "yaffs_ecc.h" ++#include "yaffs_getblockinfo.h" ++#include "yaffs_trace.h" ++ ++static void yaffs_handle_rd_data_error(struct yaffs_dev *dev, int nand_chunk); ++ ++ ++/********** Tags ECC calculations *********/ ++ ++ ++void yaffs_calc_tags_ecc(struct yaffs_tags *tags) ++{ ++ /* Calculate an ecc */ ++ unsigned char *b = ((union yaffs_tags_union *)tags)->as_bytes; ++ unsigned i, j; ++ unsigned ecc = 0; ++ unsigned bit = 0; ++ ++ tags->ecc = 0; ++ ++ for (i = 0; i < 8; i++) { ++ for (j = 1; j & 0xff; j <<= 1) { ++ bit++; ++ if (b[i] & j) ++ ecc ^= bit; ++ } ++ } ++ tags->ecc = ecc; ++} ++ ++int yaffs_check_tags_ecc(struct yaffs_tags *tags) ++{ ++ unsigned ecc = tags->ecc; ++ ++ yaffs_calc_tags_ecc(tags); ++ ++ ecc ^= tags->ecc; ++ ++ if (ecc && ecc <= 64) { ++ /* TODO: Handle the failure better. Retire? */ ++ unsigned char *b = ((union yaffs_tags_union *)tags)->as_bytes; ++ ++ ecc--; ++ ++ b[ecc / 8] ^= (1 << (ecc & 7)); ++ ++ /* Now recvalc the ecc */ ++ yaffs_calc_tags_ecc(tags); ++ ++ return 1; /* recovered error */ ++ } else if (ecc) { ++ /* Wierd ecc failure value */ ++ /* TODO Need to do somethiong here */ ++ return -1; /* unrecovered error */ ++ } ++ return 0; ++} ++ ++/********** Tags **********/ ++ ++static void yaffs_load_tags_to_spare(struct yaffs_spare *spare_ptr, ++ struct yaffs_tags *tags_ptr) ++{ ++ union yaffs_tags_union *tu = (union yaffs_tags_union *)tags_ptr; ++ ++ yaffs_calc_tags_ecc(tags_ptr); ++ ++ spare_ptr->tb0 = tu->as_bytes[0]; ++ spare_ptr->tb1 = tu->as_bytes[1]; ++ spare_ptr->tb2 = tu->as_bytes[2]; ++ spare_ptr->tb3 = tu->as_bytes[3]; ++ spare_ptr->tb4 = tu->as_bytes[4]; ++ spare_ptr->tb5 = tu->as_bytes[5]; ++ spare_ptr->tb6 = tu->as_bytes[6]; ++ spare_ptr->tb7 = tu->as_bytes[7]; ++} ++ ++static void yaffs_get_tags_from_spare(struct yaffs_dev *dev, ++ struct yaffs_spare *spare_ptr, ++ struct yaffs_tags *tags_ptr) ++{ ++ union yaffs_tags_union *tu = (union yaffs_tags_union *)tags_ptr; ++ int result; ++ ++ tu->as_bytes[0] = spare_ptr->tb0; ++ tu->as_bytes[1] = spare_ptr->tb1; ++ tu->as_bytes[2] = spare_ptr->tb2; ++ tu->as_bytes[3] = spare_ptr->tb3; ++ tu->as_bytes[4] = spare_ptr->tb4; ++ tu->as_bytes[5] = spare_ptr->tb5; ++ tu->as_bytes[6] = spare_ptr->tb6; ++ tu->as_bytes[7] = spare_ptr->tb7; ++ ++ result = yaffs_check_tags_ecc(tags_ptr); ++ if (result > 0) ++ dev->n_tags_ecc_fixed++; ++ else if (result < 0) ++ dev->n_tags_ecc_unfixed++; ++} ++ ++static void yaffs_spare_init(struct yaffs_spare *spare) ++{ ++ memset(spare, 0xff, sizeof(struct yaffs_spare)); ++} ++ ++static int yaffs_wr_nand(struct yaffs_dev *dev, ++ int nand_chunk, const u8 *data, ++ struct yaffs_spare *spare) ++{ ++ int data_size = dev->data_bytes_per_chunk; ++ ++ return dev->drv.drv_write_chunk_fn(dev, nand_chunk, ++ data, data_size, ++ (u8 *) spare, sizeof(*spare)); ++} ++ ++static int yaffs_rd_chunk_nand(struct yaffs_dev *dev, ++ int nand_chunk, ++ u8 *data, ++ struct yaffs_spare *spare, ++ enum yaffs_ecc_result *ecc_result, ++ int correct_errors) ++{ ++ int ret_val; ++ struct yaffs_spare local_spare; ++ int data_size; ++ int spare_size; ++ int ecc_result1, ecc_result2; ++ u8 calc_ecc[3]; ++ ++ if (!spare) { ++ /* If we don't have a real spare, then we use a local one. */ ++ /* Need this for the calculation of the ecc */ ++ spare = &local_spare; ++ } ++ data_size = dev->data_bytes_per_chunk; ++ spare_size = sizeof(struct yaffs_spare); ++ ++ if (dev->param.use_nand_ecc) ++ return dev->drv.drv_read_chunk_fn(dev, nand_chunk, ++ data, data_size, ++ (u8 *) spare, spare_size, ++ ecc_result); ++ ++ ++ /* Handle the ECC at this level. */ ++ ++ ret_val = dev->drv.drv_read_chunk_fn(dev, nand_chunk, ++ data, data_size, ++ (u8 *)spare, spare_size, ++ NULL); ++ if (!data || !correct_errors) ++ return ret_val; ++ ++ /* Do ECC correction if needed. */ ++ yaffs_ecc_calc(data, calc_ecc); ++ ecc_result1 = yaffs_ecc_correct(data, spare->ecc1, calc_ecc); ++ yaffs_ecc_calc(&data[256], calc_ecc); ++ ecc_result2 = yaffs_ecc_correct(&data[256], spare->ecc2, calc_ecc); ++ ++ if (ecc_result1 > 0) { ++ yaffs_trace(YAFFS_TRACE_ERROR, ++ "**>>yaffs ecc error fix performed on chunk %d:0", ++ nand_chunk); ++ dev->n_ecc_fixed++; ++ } else if (ecc_result1 < 0) { ++ yaffs_trace(YAFFS_TRACE_ERROR, ++ "**>>yaffs ecc error unfixed on chunk %d:0", ++ nand_chunk); ++ dev->n_ecc_unfixed++; ++ } ++ ++ if (ecc_result2 > 0) { ++ yaffs_trace(YAFFS_TRACE_ERROR, ++ "**>>yaffs ecc error fix performed on chunk %d:1", ++ nand_chunk); ++ dev->n_ecc_fixed++; ++ } else if (ecc_result2 < 0) { ++ yaffs_trace(YAFFS_TRACE_ERROR, ++ "**>>yaffs ecc error unfixed on chunk %d:1", ++ nand_chunk); ++ dev->n_ecc_unfixed++; ++ } ++ ++ if (ecc_result1 || ecc_result2) { ++ /* We had a data problem on this page */ ++ yaffs_handle_rd_data_error(dev, nand_chunk); ++ } ++ ++ if (ecc_result1 < 0 || ecc_result2 < 0) ++ *ecc_result = YAFFS_ECC_RESULT_UNFIXED; ++ else if (ecc_result1 > 0 || ecc_result2 > 0) ++ *ecc_result = YAFFS_ECC_RESULT_FIXED; ++ else ++ *ecc_result = YAFFS_ECC_RESULT_NO_ERROR; ++ ++ return ret_val; ++} ++ ++/* ++ * Functions for robustisizing ++ */ ++ ++static void yaffs_handle_rd_data_error(struct yaffs_dev *dev, int nand_chunk) ++{ ++ int flash_block = nand_chunk / dev->param.chunks_per_block; ++ ++ /* Mark the block for retirement */ ++ yaffs_get_block_info(dev, flash_block + dev->block_offset)-> ++ needs_retiring = 1; ++ yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS, ++ "**>>Block %d marked for retirement", ++ flash_block); ++ ++ /* TODO: ++ * Just do a garbage collection on the affected block ++ * then retire the block ++ * NB recursion ++ */ ++} ++ ++static int yaffs_tags_compat_wr(struct yaffs_dev *dev, ++ int nand_chunk, ++ const u8 *data, const struct yaffs_ext_tags *ext_tags) ++{ ++ struct yaffs_spare spare; ++ struct yaffs_tags tags; ++ ++ yaffs_spare_init(&spare); ++ ++ if (ext_tags->is_deleted) ++ spare.page_status = 0; ++ else { ++ tags.obj_id = ext_tags->obj_id; ++ tags.chunk_id = ext_tags->chunk_id; ++ ++ tags.n_bytes_lsb = ext_tags->n_bytes & (1024 - 1); ++ ++ if (dev->data_bytes_per_chunk >= 1024) ++ tags.n_bytes_msb = (ext_tags->n_bytes >> 10) & 3; ++ else ++ tags.n_bytes_msb = 3; ++ ++ tags.serial_number = ext_tags->serial_number; ++ ++ if (!dev->param.use_nand_ecc && data) { ++ yaffs_ecc_calc(data, spare.ecc1); ++ yaffs_ecc_calc(&data[256], spare.ecc2); ++ } ++ ++ yaffs_load_tags_to_spare(&spare, &tags); ++ } ++ return yaffs_wr_nand(dev, nand_chunk, data, &spare); ++} ++ ++static int yaffs_tags_compat_rd(struct yaffs_dev *dev, ++ int nand_chunk, ++ u8 *data, struct yaffs_ext_tags *ext_tags) ++{ ++ struct yaffs_spare spare; ++ struct yaffs_tags tags; ++ enum yaffs_ecc_result ecc_result = YAFFS_ECC_RESULT_UNKNOWN; ++ static struct yaffs_spare spare_ff; ++ static int init; ++ int deleted; ++ ++ if (!init) { ++ memset(&spare_ff, 0xff, sizeof(spare_ff)); ++ init = 1; ++ } ++ ++ if (!yaffs_rd_chunk_nand(dev, nand_chunk, ++ data, &spare, &ecc_result, 1)) ++ return YAFFS_FAIL; ++ ++ /* ext_tags may be NULL */ ++ if (!ext_tags) ++ return YAFFS_OK; ++ ++ deleted = (hweight8(spare.page_status) < 7) ? 1 : 0; ++ ++ ext_tags->is_deleted = deleted; ++ ext_tags->ecc_result = ecc_result; ++ ext_tags->block_bad = 0; /* We're reading it */ ++ /* therefore it is not a bad block */ ++ ext_tags->chunk_used = ++ memcmp(&spare_ff, &spare, sizeof(spare_ff)) ? 1 : 0; ++ ++ if (ext_tags->chunk_used) { ++ yaffs_get_tags_from_spare(dev, &spare, &tags); ++ ext_tags->obj_id = tags.obj_id; ++ ext_tags->chunk_id = tags.chunk_id; ++ ext_tags->n_bytes = tags.n_bytes_lsb; ++ ++ if (dev->data_bytes_per_chunk >= 1024) ++ ext_tags->n_bytes |= ++ (((unsigned)tags.n_bytes_msb) << 10); ++ ++ ext_tags->serial_number = tags.serial_number; ++ } ++ ++ return YAFFS_OK; ++} ++ ++static int yaffs_tags_compat_mark_bad(struct yaffs_dev *dev, int flash_block) ++{ ++ struct yaffs_spare spare; ++ ++ memset(&spare, 0xff, sizeof(struct yaffs_spare)); ++ ++ spare.block_status = 'Y'; ++ ++ yaffs_wr_nand(dev, flash_block * dev->param.chunks_per_block, NULL, ++ &spare); ++ yaffs_wr_nand(dev, flash_block * dev->param.chunks_per_block + 1, ++ NULL, &spare); ++ ++ return YAFFS_OK; ++} ++ ++static int yaffs_tags_compat_query_block(struct yaffs_dev *dev, ++ int block_no, ++ enum yaffs_block_state *state, ++ u32 *seq_number) ++{ ++ struct yaffs_spare spare0, spare1; ++ static struct yaffs_spare spare_ff; ++ static int init; ++ enum yaffs_ecc_result dummy; ++ ++ if (!init) { ++ memset(&spare_ff, 0xff, sizeof(spare_ff)); ++ init = 1; ++ } ++ ++ *seq_number = 0; ++ ++ /* Look for bad block markers in the first two chunks */ ++ yaffs_rd_chunk_nand(dev, block_no * dev->param.chunks_per_block, ++ NULL, &spare0, &dummy, 0); ++ yaffs_rd_chunk_nand(dev, block_no * dev->param.chunks_per_block + 1, ++ NULL, &spare1, &dummy, 0); ++ ++ if (hweight8(spare0.block_status & spare1.block_status) < 7) ++ *state = YAFFS_BLOCK_STATE_DEAD; ++ else if (memcmp(&spare_ff, &spare0, sizeof(spare_ff)) == 0) ++ *state = YAFFS_BLOCK_STATE_EMPTY; ++ else ++ *state = YAFFS_BLOCK_STATE_NEEDS_SCAN; ++ ++ return YAFFS_OK; ++} ++ ++void yaffs_tags_compat_install(struct yaffs_dev *dev) ++{ ++ if(dev->param.is_yaffs2) ++ return; ++ if(!dev->tagger.write_chunk_tags_fn) ++ dev->tagger.write_chunk_tags_fn = yaffs_tags_compat_wr; ++ if(!dev->tagger.read_chunk_tags_fn) ++ dev->tagger.read_chunk_tags_fn = yaffs_tags_compat_rd; ++ if(!dev->tagger.query_block_fn) ++ dev->tagger.query_block_fn = yaffs_tags_compat_query_block; ++ if(!dev->tagger.mark_bad_fn) ++ dev->tagger.mark_bad_fn = yaffs_tags_compat_mark_bad; ++} +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_tagscompat.h linux-3.15-rc5/fs/yaffs2/yaffs_tagscompat.h +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_tagscompat.h 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_tagscompat.h 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,44 @@ ++/* ++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU Lesser General Public License version 2.1 as ++ * published by the Free Software Foundation. ++ * ++ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. ++ */ ++ ++#ifndef __YAFFS_TAGSCOMPAT_H__ ++#define __YAFFS_TAGSCOMPAT_H__ ++ ++ ++#include "yaffs_guts.h" ++ ++#if 0 ++ ++ ++int yaffs_tags_compat_wr(struct yaffs_dev *dev, ++ int nand_chunk, ++ const u8 *data, const struct yaffs_ext_tags *tags); ++int yaffs_tags_compat_rd(struct yaffs_dev *dev, ++ int nand_chunk, ++ u8 *data, struct yaffs_ext_tags *tags); ++int yaffs_tags_compat_mark_bad(struct yaffs_dev *dev, int block_no); ++int yaffs_tags_compat_query_block(struct yaffs_dev *dev, ++ int block_no, ++ enum yaffs_block_state *state, ++ u32 *seq_number); ++ ++#endif ++ ++ ++void yaffs_tags_compat_install(struct yaffs_dev *dev); ++void yaffs_calc_tags_ecc(struct yaffs_tags *tags); ++int yaffs_check_tags_ecc(struct yaffs_tags *tags); ++ ++#endif +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_tagsmarshall.c linux-3.15-rc5/fs/yaffs2/yaffs_tagsmarshall.c +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_tagsmarshall.c 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_tagsmarshall.c 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,199 @@ ++/* ++ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU General Public License version 2 as ++ * published by the Free Software Foundation. ++ */ ++ ++#include "yaffs_guts.h" ++#include "yaffs_trace.h" ++#include "yaffs_packedtags2.h" ++ ++static int yaffs_tags_marshall_write(struct yaffs_dev *dev, ++ int nand_chunk, const u8 *data, ++ const struct yaffs_ext_tags *tags) ++{ ++ struct yaffs_packed_tags2 pt; ++ int retval; ++ ++ int packed_tags_size = ++ dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt); ++ void *packed_tags_ptr = ++ dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt; ++ ++ yaffs_trace(YAFFS_TRACE_MTD, ++ "yaffs_tags_marshall_write chunk %d data %p tags %p", ++ nand_chunk, data, tags); ++ ++ /* For yaffs2 writing there must be both data and tags. ++ * If we're using inband tags, then the tags are stuffed into ++ * the end of the data buffer. ++ */ ++ if (!data || !tags) ++ BUG(); ++ else if (dev->param.inband_tags) { ++ struct yaffs_packed_tags2_tags_only *pt2tp; ++ pt2tp = ++ (struct yaffs_packed_tags2_tags_only *)(data + ++ dev-> ++ data_bytes_per_chunk); ++ yaffs_pack_tags2_tags_only(pt2tp, tags); ++ } else { ++ yaffs_pack_tags2(&pt, tags, !dev->param.no_tags_ecc); ++ } ++ ++ retval = dev->drv.drv_write_chunk_fn(dev, nand_chunk, ++ data, dev->param.total_bytes_per_chunk, ++ (dev->param.inband_tags) ? NULL : packed_tags_ptr, ++ (dev->param.inband_tags) ? 0 : packed_tags_size); ++ ++ return retval; ++} ++ ++static int yaffs_tags_marshall_read(struct yaffs_dev *dev, ++ int nand_chunk, u8 *data, ++ struct yaffs_ext_tags *tags) ++{ ++ int retval = 0; ++ int local_data = 0; ++ u8 spare_buffer[100]; ++ enum yaffs_ecc_result ecc_result; ++ ++ struct yaffs_packed_tags2 pt; ++ ++ int packed_tags_size = ++ dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt); ++ void *packed_tags_ptr = ++ dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt; ++ ++ yaffs_trace(YAFFS_TRACE_MTD, ++ "yaffs_tags_marshall_read chunk %d data %p tags %p", ++ nand_chunk, data, tags); ++ ++ if (dev->param.inband_tags) { ++ if (!data) { ++ local_data = 1; ++ data = yaffs_get_temp_buffer(dev); ++ } ++ } ++ ++ if (dev->param.inband_tags || (data && !tags)) ++ retval = dev->drv.drv_read_chunk_fn(dev, nand_chunk, ++ data, dev->param.total_bytes_per_chunk, ++ NULL, 0, ++ &ecc_result); ++ else if (tags) ++ retval = dev->drv.drv_read_chunk_fn(dev, nand_chunk, ++ data, dev->param.total_bytes_per_chunk, ++ spare_buffer, packed_tags_size, ++ &ecc_result); ++ else ++ BUG(); ++ ++ ++ if (dev->param.inband_tags) { ++ if (tags) { ++ struct yaffs_packed_tags2_tags_only *pt2tp; ++ pt2tp = ++ (struct yaffs_packed_tags2_tags_only *) ++ &data[dev->data_bytes_per_chunk]; ++ yaffs_unpack_tags2_tags_only(tags, pt2tp); ++ } ++ } else if (tags) { ++ memcpy(packed_tags_ptr, spare_buffer, packed_tags_size); ++ yaffs_unpack_tags2(tags, &pt, !dev->param.no_tags_ecc); ++ } ++ ++ if (local_data) ++ yaffs_release_temp_buffer(dev, data); ++ ++ if (tags && ecc_result == YAFFS_ECC_RESULT_UNFIXED) { ++ tags->ecc_result = YAFFS_ECC_RESULT_UNFIXED; ++ dev->n_ecc_unfixed++; ++ } ++ ++ if (tags && ecc_result == -YAFFS_ECC_RESULT_FIXED) { ++ if (tags->ecc_result <= YAFFS_ECC_RESULT_NO_ERROR) ++ tags->ecc_result = YAFFS_ECC_RESULT_FIXED; ++ dev->n_ecc_fixed++; ++ } ++ ++ if (ecc_result < YAFFS_ECC_RESULT_UNFIXED) ++ return YAFFS_OK; ++ else ++ return YAFFS_FAIL; ++} ++ ++static int yaffs_tags_marshall_query_block(struct yaffs_dev *dev, int block_no, ++ enum yaffs_block_state *state, ++ u32 *seq_number) ++{ ++ int retval; ++ ++ yaffs_trace(YAFFS_TRACE_MTD, "yaffs_tags_marshall_query_block %d", ++ block_no); ++ ++ retval = dev->drv.drv_check_bad_fn(dev, block_no); ++ ++ if (retval== YAFFS_FAIL) { ++ yaffs_trace(YAFFS_TRACE_MTD, "block is bad"); ++ ++ *state = YAFFS_BLOCK_STATE_DEAD; ++ *seq_number = 0; ++ } else { ++ struct yaffs_ext_tags t; ++ ++ yaffs_tags_marshall_read(dev, ++ block_no * dev->param.chunks_per_block, ++ NULL, &t); ++ ++ if (t.chunk_used) { ++ *seq_number = t.seq_number; ++ *state = YAFFS_BLOCK_STATE_NEEDS_SCAN; ++ } else { ++ *seq_number = 0; ++ *state = YAFFS_BLOCK_STATE_EMPTY; ++ } ++ } ++ ++ yaffs_trace(YAFFS_TRACE_MTD, ++ "block query returns seq %d state %d", ++ *seq_number, *state); ++ ++ if (retval == 0) ++ return YAFFS_OK; ++ else ++ return YAFFS_FAIL; ++} ++ ++static int yaffs_tags_marshall_mark_bad(struct yaffs_dev *dev, int block_no) ++{ ++ return dev->drv.drv_mark_bad_fn(dev, block_no); ++ ++} ++ ++ ++void yaffs_tags_marshall_install(struct yaffs_dev *dev) ++{ ++ if (!dev->param.is_yaffs2) ++ return; ++ ++ if (!dev->tagger.write_chunk_tags_fn) ++ dev->tagger.write_chunk_tags_fn = yaffs_tags_marshall_write; ++ ++ if (!dev->tagger.read_chunk_tags_fn) ++ dev->tagger.read_chunk_tags_fn = yaffs_tags_marshall_read; ++ ++ if (!dev->tagger.query_block_fn) ++ dev->tagger.query_block_fn = yaffs_tags_marshall_query_block; ++ ++ if (!dev->tagger.mark_bad_fn) ++ dev->tagger.mark_bad_fn = yaffs_tags_marshall_mark_bad; ++ ++} +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_tagsmarshall.h linux-3.15-rc5/fs/yaffs2/yaffs_tagsmarshall.h +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_tagsmarshall.h 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_tagsmarshall.h 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,22 @@ ++/* ++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU Lesser General Public License version 2.1 as ++ * published by the Free Software Foundation. ++ * ++ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. ++ */ ++ ++#ifndef __YAFFS_TAGSMARSHALL_H__ ++#define __YAFFS_TAGSMARSHALL_H__ ++ ++#include "yaffs_guts.h" ++void yaffs_tags_marshall_install(struct yaffs_dev *dev); ++ ++#endif +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_trace.h linux-3.15-rc5/fs/yaffs2/yaffs_trace.h +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_trace.h 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_trace.h 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,57 @@ ++/* ++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU Lesser General Public License version 2.1 as ++ * published by the Free Software Foundation. ++ * ++ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. ++ */ ++ ++#ifndef __YTRACE_H__ ++#define __YTRACE_H__ ++ ++extern unsigned int yaffs_trace_mask; ++extern unsigned int yaffs_wr_attempts; ++ ++/* ++ * Tracing flags. ++ * The flags masked in YAFFS_TRACE_ALWAYS are always traced. ++ */ ++ ++#define YAFFS_TRACE_OS 0x00000002 ++#define YAFFS_TRACE_ALLOCATE 0x00000004 ++#define YAFFS_TRACE_SCAN 0x00000008 ++#define YAFFS_TRACE_BAD_BLOCKS 0x00000010 ++#define YAFFS_TRACE_ERASE 0x00000020 ++#define YAFFS_TRACE_GC 0x00000040 ++#define YAFFS_TRACE_WRITE 0x00000080 ++#define YAFFS_TRACE_TRACING 0x00000100 ++#define YAFFS_TRACE_DELETION 0x00000200 ++#define YAFFS_TRACE_BUFFERS 0x00000400 ++#define YAFFS_TRACE_NANDACCESS 0x00000800 ++#define YAFFS_TRACE_GC_DETAIL 0x00001000 ++#define YAFFS_TRACE_SCAN_DEBUG 0x00002000 ++#define YAFFS_TRACE_MTD 0x00004000 ++#define YAFFS_TRACE_CHECKPOINT 0x00008000 ++ ++#define YAFFS_TRACE_VERIFY 0x00010000 ++#define YAFFS_TRACE_VERIFY_NAND 0x00020000 ++#define YAFFS_TRACE_VERIFY_FULL 0x00040000 ++#define YAFFS_TRACE_VERIFY_ALL 0x000f0000 ++ ++#define YAFFS_TRACE_SYNC 0x00100000 ++#define YAFFS_TRACE_BACKGROUND 0x00200000 ++#define YAFFS_TRACE_LOCK 0x00400000 ++#define YAFFS_TRACE_MOUNT 0x00800000 ++ ++#define YAFFS_TRACE_ERROR 0x40000000 ++#define YAFFS_TRACE_BUG 0x80000000 ++#define YAFFS_TRACE_ALWAYS 0xf0000000 ++ ++#endif +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_verify.c linux-3.15-rc5/fs/yaffs2/yaffs_verify.c +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_verify.c 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_verify.c 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,529 @@ ++/* ++ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU General Public License version 2 as ++ * published by the Free Software Foundation. ++ */ ++ ++#include "yaffs_verify.h" ++#include "yaffs_trace.h" ++#include "yaffs_bitmap.h" ++#include "yaffs_getblockinfo.h" ++#include "yaffs_nand.h" ++ ++int yaffs_skip_verification(struct yaffs_dev *dev) ++{ ++ (void) dev; ++ return !(yaffs_trace_mask & ++ (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL)); ++} ++ ++static int yaffs_skip_full_verification(struct yaffs_dev *dev) ++{ ++ (void) dev; ++ return !(yaffs_trace_mask & (YAFFS_TRACE_VERIFY_FULL)); ++} ++ ++static int yaffs_skip_nand_verification(struct yaffs_dev *dev) ++{ ++ (void) dev; ++ return !(yaffs_trace_mask & (YAFFS_TRACE_VERIFY_NAND)); ++} ++ ++static const char * const block_state_name[] = { ++ "Unknown", ++ "Needs scan", ++ "Scanning", ++ "Empty", ++ "Allocating", ++ "Full", ++ "Dirty", ++ "Checkpoint", ++ "Collecting", ++ "Dead" ++}; ++ ++void yaffs_verify_blk(struct yaffs_dev *dev, struct yaffs_block_info *bi, int n) ++{ ++ int actually_used; ++ int in_use; ++ ++ if (yaffs_skip_verification(dev)) ++ return; ++ ++ /* Report illegal runtime states */ ++ if (bi->block_state >= YAFFS_NUMBER_OF_BLOCK_STATES) ++ yaffs_trace(YAFFS_TRACE_VERIFY, ++ "Block %d has undefined state %d", ++ n, bi->block_state); ++ ++ switch (bi->block_state) { ++ case YAFFS_BLOCK_STATE_UNKNOWN: ++ case YAFFS_BLOCK_STATE_SCANNING: ++ case YAFFS_BLOCK_STATE_NEEDS_SCAN: ++ yaffs_trace(YAFFS_TRACE_VERIFY, ++ "Block %d has bad run-state %s", ++ n, block_state_name[bi->block_state]); ++ } ++ ++ /* Check pages in use and soft deletions are legal */ ++ ++ actually_used = bi->pages_in_use - bi->soft_del_pages; ++ ++ if (bi->pages_in_use < 0 || ++ bi->pages_in_use > dev->param.chunks_per_block || ++ bi->soft_del_pages < 0 || ++ bi->soft_del_pages > dev->param.chunks_per_block || ++ actually_used < 0 || actually_used > dev->param.chunks_per_block) ++ yaffs_trace(YAFFS_TRACE_VERIFY, ++ "Block %d has illegal values pages_in_used %d soft_del_pages %d", ++ n, bi->pages_in_use, bi->soft_del_pages); ++ ++ /* Check chunk bitmap legal */ ++ in_use = yaffs_count_chunk_bits(dev, n); ++ if (in_use != bi->pages_in_use) ++ yaffs_trace(YAFFS_TRACE_VERIFY, ++ "Block %d has inconsistent values pages_in_use %d counted chunk bits %d", ++ n, bi->pages_in_use, in_use); ++} ++ ++void yaffs_verify_collected_blk(struct yaffs_dev *dev, ++ struct yaffs_block_info *bi, int n) ++{ ++ yaffs_verify_blk(dev, bi, n); ++ ++ /* After collection the block should be in the erased state */ ++ ++ if (bi->block_state != YAFFS_BLOCK_STATE_COLLECTING && ++ bi->block_state != YAFFS_BLOCK_STATE_EMPTY) { ++ yaffs_trace(YAFFS_TRACE_ERROR, ++ "Block %d is in state %d after gc, should be erased", ++ n, bi->block_state); ++ } ++} ++ ++void yaffs_verify_blocks(struct yaffs_dev *dev) ++{ ++ int i; ++ int state_count[YAFFS_NUMBER_OF_BLOCK_STATES]; ++ int illegal_states = 0; ++ ++ if (yaffs_skip_verification(dev)) ++ return; ++ ++ memset(state_count, 0, sizeof(state_count)); ++ ++ for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) { ++ struct yaffs_block_info *bi = yaffs_get_block_info(dev, i); ++ yaffs_verify_blk(dev, bi, i); ++ ++ if (bi->block_state < YAFFS_NUMBER_OF_BLOCK_STATES) ++ state_count[bi->block_state]++; ++ else ++ illegal_states++; ++ } ++ ++ yaffs_trace(YAFFS_TRACE_VERIFY, "Block summary"); ++ ++ yaffs_trace(YAFFS_TRACE_VERIFY, ++ "%d blocks have illegal states", ++ illegal_states); ++ if (state_count[YAFFS_BLOCK_STATE_ALLOCATING] > 1) ++ yaffs_trace(YAFFS_TRACE_VERIFY, ++ "Too many allocating blocks"); ++ ++ for (i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++) ++ yaffs_trace(YAFFS_TRACE_VERIFY, ++ "%s %d blocks", ++ block_state_name[i], state_count[i]); ++ ++ if (dev->blocks_in_checkpt != state_count[YAFFS_BLOCK_STATE_CHECKPOINT]) ++ yaffs_trace(YAFFS_TRACE_VERIFY, ++ "Checkpoint block count wrong dev %d count %d", ++ dev->blocks_in_checkpt, ++ state_count[YAFFS_BLOCK_STATE_CHECKPOINT]); ++ ++ if (dev->n_erased_blocks != state_count[YAFFS_BLOCK_STATE_EMPTY]) ++ yaffs_trace(YAFFS_TRACE_VERIFY, ++ "Erased block count wrong dev %d count %d", ++ dev->n_erased_blocks, ++ state_count[YAFFS_BLOCK_STATE_EMPTY]); ++ ++ if (state_count[YAFFS_BLOCK_STATE_COLLECTING] > 1) ++ yaffs_trace(YAFFS_TRACE_VERIFY, ++ "Too many collecting blocks %d (max is 1)", ++ state_count[YAFFS_BLOCK_STATE_COLLECTING]); ++} ++ ++/* ++ * Verify the object header. oh must be valid, but obj and tags may be NULL in ++ * which case those tests will not be performed. ++ */ ++void yaffs_verify_oh(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh, ++ struct yaffs_ext_tags *tags, int parent_check) ++{ ++ if (obj && yaffs_skip_verification(obj->my_dev)) ++ return; ++ ++ if (!(tags && obj && oh)) { ++ yaffs_trace(YAFFS_TRACE_VERIFY, ++ "Verifying object header tags %p obj %p oh %p", ++ tags, obj, oh); ++ return; ++ } ++ ++ if (oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN || ++ oh->type > YAFFS_OBJECT_TYPE_MAX) ++ yaffs_trace(YAFFS_TRACE_VERIFY, ++ "Obj %d header type is illegal value 0x%x", ++ tags->obj_id, oh->type); ++ ++ if (tags->obj_id != obj->obj_id) ++ yaffs_trace(YAFFS_TRACE_VERIFY, ++ "Obj %d header mismatch obj_id %d", ++ tags->obj_id, obj->obj_id); ++ ++ /* ++ * Check that the object's parent ids match if parent_check requested. ++ * ++ * Tests do not apply to the root object. ++ */ ++ ++ if (parent_check && tags->obj_id > 1 && !obj->parent) ++ yaffs_trace(YAFFS_TRACE_VERIFY, ++ "Obj %d header mismatch parent_id %d obj->parent is NULL", ++ tags->obj_id, oh->parent_obj_id); ++ ++ if (parent_check && obj->parent && ++ oh->parent_obj_id != obj->parent->obj_id && ++ (oh->parent_obj_id != YAFFS_OBJECTID_UNLINKED || ++ obj->parent->obj_id != YAFFS_OBJECTID_DELETED)) ++ yaffs_trace(YAFFS_TRACE_VERIFY, ++ "Obj %d header mismatch parent_id %d parent_obj_id %d", ++ tags->obj_id, oh->parent_obj_id, ++ obj->parent->obj_id); ++ ++ if (tags->obj_id > 1 && oh->name[0] == 0) /* Null name */ ++ yaffs_trace(YAFFS_TRACE_VERIFY, ++ "Obj %d header name is NULL", ++ obj->obj_id); ++ ++ if (tags->obj_id > 1 && ((u8) (oh->name[0])) == 0xff) /* Junk name */ ++ yaffs_trace(YAFFS_TRACE_VERIFY, ++ "Obj %d header name is 0xff", ++ obj->obj_id); ++} ++ ++void yaffs_verify_file(struct yaffs_obj *obj) ++{ ++ u32 x; ++ int required_depth; ++ int actual_depth; ++ int last_chunk; ++ u32 offset_in_chunk; ++ u32 the_chunk; ++ ++ u32 i; ++ struct yaffs_dev *dev; ++ struct yaffs_ext_tags tags; ++ struct yaffs_tnode *tn; ++ u32 obj_id; ++ ++ if (!obj) ++ return; ++ ++ if (yaffs_skip_verification(obj->my_dev)) ++ return; ++ ++ dev = obj->my_dev; ++ obj_id = obj->obj_id; ++ ++ ++ /* Check file size is consistent with tnode depth */ ++ yaffs_addr_to_chunk(dev, obj->variant.file_variant.file_size, ++ &last_chunk, &offset_in_chunk); ++ last_chunk++; ++ x = last_chunk >> YAFFS_TNODES_LEVEL0_BITS; ++ required_depth = 0; ++ while (x > 0) { ++ x >>= YAFFS_TNODES_INTERNAL_BITS; ++ required_depth++; ++ } ++ ++ actual_depth = obj->variant.file_variant.top_level; ++ ++ /* Check that the chunks in the tnode tree are all correct. ++ * We do this by scanning through the tnode tree and ++ * checking the tags for every chunk match. ++ */ ++ ++ if (yaffs_skip_nand_verification(dev)) ++ return; ++ ++ for (i = 1; i <= last_chunk; i++) { ++ tn = yaffs_find_tnode_0(dev, &obj->variant.file_variant, i); ++ ++ if (!tn) ++ continue; ++ ++ the_chunk = yaffs_get_group_base(dev, tn, i); ++ if (the_chunk > 0) { ++ yaffs_rd_chunk_tags_nand(dev, the_chunk, NULL, ++ &tags); ++ if (tags.obj_id != obj_id || tags.chunk_id != i) ++ yaffs_trace(YAFFS_TRACE_VERIFY, ++ "Object %d chunk_id %d NAND mismatch chunk %d tags (%d:%d)", ++ obj_id, i, the_chunk, ++ tags.obj_id, tags.chunk_id); ++ } ++ } ++} ++ ++void yaffs_verify_link(struct yaffs_obj *obj) ++{ ++ if (obj && yaffs_skip_verification(obj->my_dev)) ++ return; ++ ++ /* Verify sane equivalent object */ ++} ++ ++void yaffs_verify_symlink(struct yaffs_obj *obj) ++{ ++ if (obj && yaffs_skip_verification(obj->my_dev)) ++ return; ++ ++ /* Verify symlink string */ ++} ++ ++void yaffs_verify_special(struct yaffs_obj *obj) ++{ ++ if (obj && yaffs_skip_verification(obj->my_dev)) ++ return; ++} ++ ++void yaffs_verify_obj(struct yaffs_obj *obj) ++{ ++ struct yaffs_dev *dev; ++ u32 chunk_min; ++ u32 chunk_max; ++ u32 chunk_id_ok; ++ u32 chunk_in_range; ++ u32 chunk_wrongly_deleted; ++ u32 chunk_valid; ++ ++ if (!obj) ++ return; ++ ++ if (obj->being_created) ++ return; ++ ++ dev = obj->my_dev; ++ ++ if (yaffs_skip_verification(dev)) ++ return; ++ ++ /* Check sane object header chunk */ ++ ++ chunk_min = dev->internal_start_block * dev->param.chunks_per_block; ++ chunk_max = ++ (dev->internal_end_block + 1) * dev->param.chunks_per_block - 1; ++ ++ chunk_in_range = (((unsigned)(obj->hdr_chunk)) >= chunk_min && ++ ((unsigned)(obj->hdr_chunk)) <= chunk_max); ++ chunk_id_ok = chunk_in_range || (obj->hdr_chunk == 0); ++ chunk_valid = chunk_in_range && ++ yaffs_check_chunk_bit(dev, ++ obj->hdr_chunk / dev->param.chunks_per_block, ++ obj->hdr_chunk % dev->param.chunks_per_block); ++ chunk_wrongly_deleted = chunk_in_range && !chunk_valid; ++ ++ if (!obj->fake && (!chunk_id_ok || chunk_wrongly_deleted)) ++ yaffs_trace(YAFFS_TRACE_VERIFY, ++ "Obj %d has chunk_id %d %s %s", ++ obj->obj_id, obj->hdr_chunk, ++ chunk_id_ok ? "" : ",out of range", ++ chunk_wrongly_deleted ? ",marked as deleted" : ""); ++ ++ if (chunk_valid && !yaffs_skip_nand_verification(dev)) { ++ struct yaffs_ext_tags tags; ++ struct yaffs_obj_hdr *oh; ++ u8 *buffer = yaffs_get_temp_buffer(dev); ++ ++ oh = (struct yaffs_obj_hdr *)buffer; ++ ++ yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, buffer, &tags); ++ ++ yaffs_verify_oh(obj, oh, &tags, 1); ++ ++ yaffs_release_temp_buffer(dev, buffer); ++ } ++ ++ /* Verify it has a parent */ ++ if (obj && !obj->fake && (!obj->parent || obj->parent->my_dev != dev)) { ++ yaffs_trace(YAFFS_TRACE_VERIFY, ++ "Obj %d has parent pointer %p which does not look like an object", ++ obj->obj_id, obj->parent); ++ } ++ ++ /* Verify parent is a directory */ ++ if (obj->parent && ++ obj->parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) { ++ yaffs_trace(YAFFS_TRACE_VERIFY, ++ "Obj %d's parent is not a directory (type %d)", ++ obj->obj_id, obj->parent->variant_type); ++ } ++ ++ switch (obj->variant_type) { ++ case YAFFS_OBJECT_TYPE_FILE: ++ yaffs_verify_file(obj); ++ break; ++ case YAFFS_OBJECT_TYPE_SYMLINK: ++ yaffs_verify_symlink(obj); ++ break; ++ case YAFFS_OBJECT_TYPE_DIRECTORY: ++ yaffs_verify_dir(obj); ++ break; ++ case YAFFS_OBJECT_TYPE_HARDLINK: ++ yaffs_verify_link(obj); ++ break; ++ case YAFFS_OBJECT_TYPE_SPECIAL: ++ yaffs_verify_special(obj); ++ break; ++ case YAFFS_OBJECT_TYPE_UNKNOWN: ++ default: ++ yaffs_trace(YAFFS_TRACE_VERIFY, ++ "Obj %d has illegaltype %d", ++ obj->obj_id, obj->variant_type); ++ break; ++ } ++} ++ ++void yaffs_verify_objects(struct yaffs_dev *dev) ++{ ++ struct yaffs_obj *obj; ++ int i; ++ struct list_head *lh; ++ ++ if (yaffs_skip_verification(dev)) ++ return; ++ ++ /* Iterate through the objects in each hash entry */ ++ ++ for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) { ++ list_for_each(lh, &dev->obj_bucket[i].list) { ++ obj = list_entry(lh, struct yaffs_obj, hash_link); ++ yaffs_verify_obj(obj); ++ } ++ } ++} ++ ++void yaffs_verify_obj_in_dir(struct yaffs_obj *obj) ++{ ++ struct list_head *lh; ++ struct yaffs_obj *list_obj; ++ int count = 0; ++ ++ if (!obj) { ++ yaffs_trace(YAFFS_TRACE_ALWAYS, "No object to verify"); ++ BUG(); ++ return; ++ } ++ ++ if (yaffs_skip_verification(obj->my_dev)) ++ return; ++ ++ if (!obj->parent) { ++ yaffs_trace(YAFFS_TRACE_ALWAYS, "Object does not have parent"); ++ BUG(); ++ return; ++ } ++ ++ if (obj->parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) { ++ yaffs_trace(YAFFS_TRACE_ALWAYS, "Parent is not directory"); ++ BUG(); ++ } ++ ++ /* Iterate through the objects in each hash entry */ ++ ++ list_for_each(lh, &obj->parent->variant.dir_variant.children) { ++ list_obj = list_entry(lh, struct yaffs_obj, siblings); ++ yaffs_verify_obj(list_obj); ++ if (obj == list_obj) ++ count++; ++ } ++ ++ if (count != 1) { ++ yaffs_trace(YAFFS_TRACE_ALWAYS, ++ "Object in directory %d times", ++ count); ++ BUG(); ++ } ++} ++ ++void yaffs_verify_dir(struct yaffs_obj *directory) ++{ ++ struct list_head *lh; ++ struct yaffs_obj *list_obj; ++ ++ if (!directory) { ++ BUG(); ++ return; ++ } ++ ++ if (yaffs_skip_full_verification(directory->my_dev)) ++ return; ++ ++ if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) { ++ yaffs_trace(YAFFS_TRACE_ALWAYS, ++ "Directory has wrong type: %d", ++ directory->variant_type); ++ BUG(); ++ } ++ ++ /* Iterate through the objects in each hash entry */ ++ ++ list_for_each(lh, &directory->variant.dir_variant.children) { ++ list_obj = list_entry(lh, struct yaffs_obj, siblings); ++ if (list_obj->parent != directory) { ++ yaffs_trace(YAFFS_TRACE_ALWAYS, ++ "Object in directory list has wrong parent %p", ++ list_obj->parent); ++ BUG(); ++ } ++ yaffs_verify_obj_in_dir(list_obj); ++ } ++} ++ ++static int yaffs_free_verification_failures; ++ ++void yaffs_verify_free_chunks(struct yaffs_dev *dev) ++{ ++ int counted; ++ int difference; ++ ++ if (yaffs_skip_verification(dev)) ++ return; ++ ++ counted = yaffs_count_free_chunks(dev); ++ ++ difference = dev->n_free_chunks - counted; ++ ++ if (difference) { ++ yaffs_trace(YAFFS_TRACE_ALWAYS, ++ "Freechunks verification failure %d %d %d", ++ dev->n_free_chunks, counted, difference); ++ yaffs_free_verification_failures++; ++ } ++} ++ ++int yaffs_verify_file_sane(struct yaffs_obj *in) ++{ ++ (void) in; ++ return YAFFS_OK; ++} +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_verify.h linux-3.15-rc5/fs/yaffs2/yaffs_verify.h +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_verify.h 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_verify.h 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,43 @@ ++/* ++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU Lesser General Public License version 2.1 as ++ * published by the Free Software Foundation. ++ * ++ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. ++ */ ++ ++#ifndef __YAFFS_VERIFY_H__ ++#define __YAFFS_VERIFY_H__ ++ ++#include "yaffs_guts.h" ++ ++void yaffs_verify_blk(struct yaffs_dev *dev, struct yaffs_block_info *bi, ++ int n); ++void yaffs_verify_collected_blk(struct yaffs_dev *dev, ++ struct yaffs_block_info *bi, int n); ++void yaffs_verify_blocks(struct yaffs_dev *dev); ++ ++void yaffs_verify_oh(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh, ++ struct yaffs_ext_tags *tags, int parent_check); ++void yaffs_verify_file(struct yaffs_obj *obj); ++void yaffs_verify_link(struct yaffs_obj *obj); ++void yaffs_verify_symlink(struct yaffs_obj *obj); ++void yaffs_verify_special(struct yaffs_obj *obj); ++void yaffs_verify_obj(struct yaffs_obj *obj); ++void yaffs_verify_objects(struct yaffs_dev *dev); ++void yaffs_verify_obj_in_dir(struct yaffs_obj *obj); ++void yaffs_verify_dir(struct yaffs_obj *directory); ++void yaffs_verify_free_chunks(struct yaffs_dev *dev); ++ ++int yaffs_verify_file_sane(struct yaffs_obj *obj); ++ ++int yaffs_skip_verification(struct yaffs_dev *dev); ++ ++#endif +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_vfs.c linux-3.15-rc5/fs/yaffs2/yaffs_vfs.c +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_vfs.c 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_vfs.c 2014-05-17 02:52:54.000000000 +0200 +@@ -0,0 +1,3604 @@ ++/* ++ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * Acknowledgements: ++ * Luc van OostenRyck for numerous patches. ++ * Nick Bane for numerous patches. ++ * Nick Bane for 2.5/2.6 integration. ++ * Andras Toth for mknod rdev issue. ++ * Michael Fischer for finding the problem with inode inconsistency. ++ * Some code bodily lifted from JFFS ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU General Public License version 2 as ++ * published by the Free Software Foundation. ++ */ ++ ++/* ++ * ++ * This is the file system front-end to YAFFS that hooks it up to ++ * the VFS. ++ * ++ * Special notes: ++ * >> 2.4: sb->u.generic_sbp points to the struct yaffs_dev associated with ++ * this superblock ++ * >> 2.6: sb->s_fs_info points to the struct yaffs_dev associated with this ++ * superblock ++ * >> inode->u.generic_ip points to the associated struct yaffs_obj. ++ */ ++ ++/* ++ * There are two variants of the VFS glue code. This variant should compile ++ * for any version of Linux. ++ */ ++#include <linux/version.h> ++ ++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 10)) ++#define YAFFS_COMPILE_BACKGROUND ++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23)) ++#define YAFFS_COMPILE_FREEZER ++#endif ++#endif ++ ++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 28)) ++#define YAFFS_COMPILE_EXPORTFS ++#endif ++ ++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 35)) ++#define YAFFS_USE_SETATTR_COPY ++#define YAFFS_USE_TRUNCATE_SETSIZE ++#endif ++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 35)) ++#define YAFFS_HAS_EVICT_INODE ++#endif ++ ++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13)) ++#define YAFFS_NEW_FOLLOW_LINK 1 ++#else ++#define YAFFS_NEW_FOLLOW_LINK 0 ++#endif ++ ++#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 6, 0)) ++#define YAFFS_HAS_WRITE_SUPER ++#endif ++ ++ ++#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19)) ++#include <linux/config.h> ++#endif ++ ++#include <linux/kernel.h> ++#include <linux/module.h> ++#include <linux/slab.h> ++#include <linux/init.h> ++#include <linux/fs.h> ++#include <linux/proc_fs.h> ++#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 39)) ++#include <linux/smp_lock.h> ++#endif ++#include <linux/pagemap.h> ++#include <linux/mtd/mtd.h> ++#include <linux/interrupt.h> ++#include <linux/string.h> ++#include <linux/ctype.h> ++ ++#if (YAFFS_NEW_FOLLOW_LINK == 1) ++#include <linux/namei.h> ++#endif ++ ++#ifdef YAFFS_COMPILE_EXPORTFS ++#include <linux/exportfs.h> ++#endif ++ ++#ifdef YAFFS_COMPILE_BACKGROUND ++#include <linux/kthread.h> ++#include <linux/delay.h> ++#endif ++#ifdef YAFFS_COMPILE_FREEZER ++#include <linux/freezer.h> ++#endif ++ ++#include <asm/div64.h> ++ ++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) ++ ++#include <linux/statfs.h> ++ ++#define UnlockPage(p) unlock_page(p) ++#define Page_Uptodate(page) test_bit(PG_uptodate, &(page)->flags) ++ ++/* FIXME: use sb->s_id instead ? */ ++#define yaffs_devname(sb, buf) bdevname(sb->s_bdev, buf) ++ ++#else ++ ++#include <linux/locks.h> ++#define BDEVNAME_SIZE 0 ++#define yaffs_devname(sb, buf) kdevname(sb->s_dev) ++ ++#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0)) ++/* added NCB 26/5/2006 for 2.4.25-vrs2-tcl1 kernel */ ++#define __user ++#endif ++ ++#endif ++ ++#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26)) ++#define YPROC_ROOT (&proc_root) ++#else ++#define YPROC_ROOT NULL ++#endif ++ ++#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26)) ++#define Y_INIT_TIMER(a) init_timer(a) ++#else ++#define Y_INIT_TIMER(a) init_timer_on_stack(a) ++#endif ++ ++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 27)) ++#define YAFFS_USE_WRITE_BEGIN_END 1 ++#else ++#define YAFFS_USE_WRITE_BEGIN_END 0 ++#endif ++ ++#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 6, 0)) ++#define YAFFS_SUPER_HAS_DIRTY ++#endif ++ ++ ++#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 2, 0)) ++#define set_nlink(inode, count) do { (inode)->i_nlink = (count); } while(0) ++#endif ++ ++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 28)) ++static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size) ++{ ++ uint64_t result = partition_size; ++ do_div(result, block_size); ++ return (uint32_t) result; ++} ++#else ++#define YCALCBLOCKS(s, b) ((s)/(b)) ++#endif ++ ++#include <linux/uaccess.h> ++#include <linux/mtd/mtd.h> ++ ++#include "yportenv.h" ++#include "yaffs_trace.h" ++#include "yaffs_guts.h" ++#include "yaffs_attribs.h" ++ ++#include "yaffs_linux.h" ++ ++#include "yaffs_mtdif.h" ++#include "yaffs_packedtags2.h" ++#include "yaffs_getblockinfo.h" ++ ++unsigned int yaffs_trace_mask = ++ YAFFS_TRACE_BAD_BLOCKS | ++ YAFFS_TRACE_ALWAYS | ++ 0; ++ ++unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS; ++unsigned int yaffs_auto_checkpoint = 1; ++unsigned int yaffs_gc_control = 1; ++unsigned int yaffs_bg_enable = 1; ++unsigned int yaffs_auto_select = 1; ++/* Module Parameters */ ++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) ++module_param(yaffs_trace_mask, uint, 0644); ++module_param(yaffs_wr_attempts, uint, 0644); ++module_param(yaffs_auto_checkpoint, uint, 0644); ++module_param(yaffs_gc_control, uint, 0644); ++module_param(yaffs_bg_enable, uint, 0644); ++#else ++MODULE_PARM(yaffs_trace_mask, "i"); ++MODULE_PARM(yaffs_wr_attempts, "i"); ++MODULE_PARM(yaffs_auto_checkpoint, "i"); ++MODULE_PARM(yaffs_gc_control, "i"); ++#endif ++ ++#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25)) ++/* use iget and read_inode */ ++#define Y_IGET(sb, inum) iget((sb), (inum)) ++ ++#else ++/* Call local equivalent */ ++#define YAFFS_USE_OWN_IGET ++#define Y_IGET(sb, inum) yaffs_iget((sb), (inum)) ++ ++#endif ++ ++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18)) ++#define yaffs_inode_to_obj_lv(iptr) ((iptr)->i_private) ++#else ++#define yaffs_inode_to_obj_lv(iptr) ((iptr)->u.generic_ip) ++#endif ++ ++#define yaffs_inode_to_obj(iptr) \ ++ ((struct yaffs_obj *)(yaffs_inode_to_obj_lv(iptr))) ++#define yaffs_dentry_to_obj(dptr) yaffs_inode_to_obj((dptr)->d_inode) ++ ++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) ++#define yaffs_super_to_dev(sb) ((struct yaffs_dev *)sb->s_fs_info) ++#else ++#define yaffs_super_to_dev(sb) ((struct yaffs_dev *)sb->u.generic_sbp) ++#endif ++ ++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0)) ++#define Y_CLEAR_INODE(i) clear_inode(i) ++#else ++#define Y_CLEAR_INODE(i) end_writeback(i) ++#endif ++ ++ ++#define update_dir_time(dir) do {\ ++ (dir)->i_ctime = (dir)->i_mtime = CURRENT_TIME; \ ++ } while (0) ++ ++static void yaffs_fill_inode_from_obj(struct inode *inode, ++ struct yaffs_obj *obj); ++ ++ ++static void yaffs_gross_lock(struct yaffs_dev *dev) ++{ ++ yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locking %p", current); ++ mutex_lock(&(yaffs_dev_to_lc(dev)->gross_lock)); ++ yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locked %p", current); ++} ++ ++static void yaffs_gross_unlock(struct yaffs_dev *dev) ++{ ++ yaffs_trace(YAFFS_TRACE_LOCK, "yaffs unlocking %p", current); ++ mutex_unlock(&(yaffs_dev_to_lc(dev)->gross_lock)); ++} ++ ++ ++static int yaffs_readpage_nolock(struct file *f, struct page *pg) ++{ ++ /* Lifted from jffs2 */ ++ ++ struct yaffs_obj *obj; ++ unsigned char *pg_buf; ++ int ret; ++ loff_t pos = ((loff_t) pg->index) << PAGE_CACHE_SHIFT; ++ struct yaffs_dev *dev; ++ ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_readpage_nolock at %lld, size %08x", ++ (long long)pos, ++ (unsigned)PAGE_CACHE_SIZE); ++ ++ obj = yaffs_dentry_to_obj(f->f_dentry); ++ ++ dev = obj->my_dev; ++ ++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) ++ BUG_ON(!PageLocked(pg)); ++#else ++ if (!PageLocked(pg)) ++ PAGE_BUG(pg); ++#endif ++ ++ pg_buf = kmap(pg); ++ /* FIXME: Can kmap fail? */ ++ ++ yaffs_gross_lock(dev); ++ ++ ret = yaffs_file_rd(obj, pg_buf, pos, PAGE_CACHE_SIZE); ++ ++ yaffs_gross_unlock(dev); ++ ++ if (ret >= 0) ++ ret = 0; ++ ++ if (ret) { ++ ClearPageUptodate(pg); ++ SetPageError(pg); ++ } else { ++ SetPageUptodate(pg); ++ ClearPageError(pg); ++ } ++ ++ flush_dcache_page(pg); ++ kunmap(pg); ++ ++ yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage_nolock done"); ++ return ret; ++} ++ ++static int yaffs_readpage_unlock(struct file *f, struct page *pg) ++{ ++ int ret = yaffs_readpage_nolock(f, pg); ++ UnlockPage(pg); ++ return ret; ++} ++ ++static int yaffs_readpage(struct file *f, struct page *pg) ++{ ++ int ret; ++ ++ yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage"); ++ ret = yaffs_readpage_unlock(f, pg); ++ yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage done"); ++ return ret; ++} ++ ++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0)) ++#define YCRED_FSUID() from_kuid(&init_user_ns, current_fsuid()) ++#define YCRED_FSGID() from_kgid(&init_user_ns, current_fsgid()) ++#else ++#define YCRED_FSUID() YCRED(current)->fsuid ++#define YCRED_FSGID() YCRED(current)->fsgid ++ ++static inline uid_t i_uid_read(const struct inode *inode) ++{ ++ return inode->i_uid; ++} ++ ++static inline gid_t i_gid_read(const struct inode *inode) ++{ ++ return inode->i_gid; ++} ++ ++static inline void i_uid_write(struct inode *inode, uid_t uid) ++{ ++ inode->i_uid = uid; ++} ++ ++static inline void i_gid_write(struct inode *inode, gid_t gid) ++{ ++ inode->i_gid = gid; ++} ++#endif ++ ++static void yaffs_set_super_dirty_val(struct yaffs_dev *dev, int val) ++{ ++ struct yaffs_linux_context *lc = yaffs_dev_to_lc(dev); ++ ++ if (lc) ++ lc->dirty = val; ++ ++# ifdef YAFFS_SUPER_HAS_DIRTY ++ { ++ struct super_block *sb = lc->super; ++ ++ if (sb) ++ sb->s_dirt = val; ++ } ++#endif ++ ++} ++ ++static void yaffs_set_super_dirty(struct yaffs_dev *dev) ++{ ++ yaffs_set_super_dirty_val(dev, 1); ++} ++ ++static void yaffs_clear_super_dirty(struct yaffs_dev *dev) ++{ ++ yaffs_set_super_dirty_val(dev, 0); ++} ++ ++static int yaffs_check_super_dirty(struct yaffs_dev *dev) ++{ ++ struct yaffs_linux_context *lc = yaffs_dev_to_lc(dev); ++ ++ if (lc && lc->dirty) ++ return 1; ++ ++# ifdef YAFFS_SUPER_HAS_DIRTY ++ { ++ struct super_block *sb = lc->super; ++ ++ if (sb && sb->s_dirt) ++ return 1; ++ } ++#endif ++ return 0; ++ ++} ++ ++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) ++static int yaffs_writepage(struct page *page, struct writeback_control *wbc) ++#else ++static int yaffs_writepage(struct page *page) ++#endif ++{ ++ struct yaffs_dev *dev; ++ struct address_space *mapping = page->mapping; ++ struct inode *inode; ++ unsigned long end_index; ++ char *buffer; ++ struct yaffs_obj *obj; ++ int n_written = 0; ++ unsigned n_bytes; ++ loff_t i_size; ++ ++ if (!mapping) ++ BUG(); ++ inode = mapping->host; ++ if (!inode) ++ BUG(); ++ i_size = i_size_read(inode); ++ ++ end_index = i_size >> PAGE_CACHE_SHIFT; ++ ++ if (page->index < end_index) ++ n_bytes = PAGE_CACHE_SIZE; ++ else { ++ n_bytes = i_size & (PAGE_CACHE_SIZE - 1); ++ ++ if (page->index > end_index || !n_bytes) { ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_writepage at %lld, inode size = %lld!!", ++ ((loff_t)page->index) << PAGE_CACHE_SHIFT, ++ inode->i_size); ++ yaffs_trace(YAFFS_TRACE_OS, ++ " -> don't care!!"); ++ ++ zero_user_segment(page, 0, PAGE_CACHE_SIZE); ++ set_page_writeback(page); ++ unlock_page(page); ++ end_page_writeback(page); ++ return 0; ++ } ++ } ++ ++ if (n_bytes != PAGE_CACHE_SIZE) ++ zero_user_segment(page, n_bytes, PAGE_CACHE_SIZE); ++ ++ get_page(page); ++ ++ buffer = kmap(page); ++ ++ obj = yaffs_inode_to_obj(inode); ++ dev = obj->my_dev; ++ yaffs_gross_lock(dev); ++ ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_writepage at %lld, size %08x", ++ ((loff_t)page->index) << PAGE_CACHE_SHIFT, n_bytes); ++ yaffs_trace(YAFFS_TRACE_OS, ++ "writepag0: obj = %lld, ino = %lld", ++ obj->variant.file_variant.file_size, inode->i_size); ++ ++ n_written = yaffs_wr_file(obj, buffer, ++ ((loff_t)page->index) << PAGE_CACHE_SHIFT, n_bytes, 0); ++ ++ yaffs_set_super_dirty(dev); ++ ++ yaffs_trace(YAFFS_TRACE_OS, ++ "writepag1: obj = %lld, ino = %lld", ++ obj->variant.file_variant.file_size, inode->i_size); ++ ++ yaffs_gross_unlock(dev); ++ ++ kunmap(page); ++ set_page_writeback(page); ++ unlock_page(page); ++ end_page_writeback(page); ++ put_page(page); ++ ++ return (n_written == n_bytes) ? 0 : -ENOSPC; ++} ++ ++/* Space holding and freeing is done to ensure we have space available for write_begin/end */ ++/* For now we just assume few parallel writes and check against a small number. */ ++/* Todo: need to do this with a counter to handle parallel reads better */ ++ ++static ssize_t yaffs_hold_space(struct file *f) ++{ ++ struct yaffs_obj *obj; ++ struct yaffs_dev *dev; ++ ++ int n_free_chunks; ++ ++ obj = yaffs_dentry_to_obj(f->f_dentry); ++ ++ dev = obj->my_dev; ++ ++ yaffs_gross_lock(dev); ++ ++ n_free_chunks = yaffs_get_n_free_chunks(dev); ++ ++ yaffs_gross_unlock(dev); ++ ++ return (n_free_chunks > 20) ? 1 : 0; ++} ++ ++static void yaffs_release_space(struct file *f) ++{ ++ struct yaffs_obj *obj; ++ struct yaffs_dev *dev; ++ ++ obj = yaffs_dentry_to_obj(f->f_dentry); ++ ++ dev = obj->my_dev; ++ ++ yaffs_gross_lock(dev); ++ ++ yaffs_gross_unlock(dev); ++} ++ ++#if (YAFFS_USE_WRITE_BEGIN_END > 0) ++static int yaffs_write_begin(struct file *filp, struct address_space *mapping, ++ loff_t pos, unsigned len, unsigned flags, ++ struct page **pagep, void **fsdata) ++{ ++ struct page *pg = NULL; ++ pgoff_t index = pos >> PAGE_CACHE_SHIFT; ++ ++ int ret = 0; ++ int space_held = 0; ++ ++ /* Get a page */ ++#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 28) ++ pg = grab_cache_page_write_begin(mapping, index, flags); ++#else ++ pg = __grab_cache_page(mapping, index); ++#endif ++ ++ *pagep = pg; ++ if (!pg) { ++ ret = -ENOMEM; ++ goto out; ++ } ++ yaffs_trace(YAFFS_TRACE_OS, ++ "start yaffs_write_begin index %d(%x) uptodate %d", ++ (int)index, (int)index, Page_Uptodate(pg) ? 1 : 0); ++ ++ /* Get fs space */ ++ space_held = yaffs_hold_space(filp); ++ ++ if (!space_held) { ++ ret = -ENOSPC; ++ goto out; ++ } ++ ++ /* Update page if required */ ++ ++ if (!Page_Uptodate(pg)) ++ ret = yaffs_readpage_nolock(filp, pg); ++ ++ if (ret) ++ goto out; ++ ++ /* Happy path return */ ++ yaffs_trace(YAFFS_TRACE_OS, "end yaffs_write_begin - ok"); ++ ++ return 0; ++ ++out: ++ yaffs_trace(YAFFS_TRACE_OS, ++ "end yaffs_write_begin fail returning %d", ret); ++ if (space_held) ++ yaffs_release_space(filp); ++ if (pg) { ++ unlock_page(pg); ++ page_cache_release(pg); ++ } ++ return ret; ++} ++ ++#else ++ ++static int yaffs_prepare_write(struct file *f, struct page *pg, ++ unsigned offset, unsigned to) ++{ ++ yaffs_trace(YAFFS_TRACE_OS, "yaffs_prepair_write"); ++ ++ if (!Page_Uptodate(pg)) ++ return yaffs_readpage_nolock(f, pg); ++ return 0; ++} ++#endif ++ ++ ++static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, ++ loff_t * pos) ++{ ++ struct yaffs_obj *obj; ++ int n_written; ++ loff_t ipos; ++ struct inode *inode; ++ struct yaffs_dev *dev; ++ ++ obj = yaffs_dentry_to_obj(f->f_dentry); ++ ++ if (!obj) { ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_file_write: hey obj is null!"); ++ return -EINVAL; ++ } ++ ++ dev = obj->my_dev; ++ ++ yaffs_gross_lock(dev); ++ ++ inode = f->f_dentry->d_inode; ++ ++ if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND) ++ ipos = inode->i_size; ++ else ++ ipos = *pos; ++ ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_file_write about to write writing %u(%x) bytes to object %d at %lld", ++ (unsigned)n, (unsigned)n, obj->obj_id, ipos); ++ ++ n_written = yaffs_wr_file(obj, buf, ipos, n, 0); ++ ++ yaffs_set_super_dirty(dev); ++ ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_file_write: %d(%x) bytes written", ++ (unsigned)n, (unsigned)n); ++ ++ if (n_written > 0) { ++ ipos += n_written; ++ *pos = ipos; ++ if (ipos > inode->i_size) { ++ inode->i_size = ipos; ++ inode->i_blocks = (ipos + 511) >> 9; ++ ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_file_write size updated to %lld bytes, %d blocks", ++ ipos, (int)(inode->i_blocks)); ++ } ++ ++ } ++ yaffs_gross_unlock(dev); ++ return (n_written == 0) && (n > 0) ? -ENOSPC : n_written; ++} ++ ++ ++#if (YAFFS_USE_WRITE_BEGIN_END > 0) ++static int yaffs_write_end(struct file *filp, struct address_space *mapping, ++ loff_t pos, unsigned len, unsigned copied, ++ struct page *pg, void *fsdadata) ++{ ++ int ret = 0; ++ void *addr, *kva; ++ uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1); ++ ++ kva = kmap(pg); ++ addr = kva + offset_into_page; ++ ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_write_end addr %p pos %lld n_bytes %d", ++ addr, pos, copied); ++ ++ ret = yaffs_file_write(filp, addr, copied, &pos); ++ ++ if (ret != copied) { ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_write_end not same size ret %d copied %d", ++ ret, copied); ++ SetPageError(pg); ++ } ++ ++ kunmap(pg); ++ ++ yaffs_release_space(filp); ++ unlock_page(pg); ++ page_cache_release(pg); ++ return ret; ++} ++#else ++ ++static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, ++ unsigned to) ++{ ++ void *addr, *kva; ++ ++ loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset; ++ int n_bytes = to - offset; ++ int n_written; ++ ++ kva = kmap(pg); ++ addr = kva + offset; ++ ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_commit_write addr %p pos %lld n_bytes %d", ++ addr, pos, n_bytes); ++ ++ n_written = yaffs_file_write(f, addr, n_bytes, &pos); ++ ++ if (n_written != n_bytes) { ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_commit_write not same size n_written %d n_bytes %d", ++ n_written, n_bytes); ++ SetPageError(pg); ++ } ++ kunmap(pg); ++ ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_commit_write returning %d", ++ n_written == n_bytes ? 0 : n_written); ++ ++ return n_written == n_bytes ? 0 : n_written; ++} ++#endif ++ ++static struct address_space_operations yaffs_file_address_operations = { ++ .readpage = yaffs_readpage, ++ .writepage = yaffs_writepage, ++#if (YAFFS_USE_WRITE_BEGIN_END > 0) ++ .write_begin = yaffs_write_begin, ++ .write_end = yaffs_write_end, ++#else ++ .prepare_write = yaffs_prepare_write, ++ .commit_write = yaffs_commit_write, ++#endif ++}; ++ ++ ++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17)) ++static int yaffs_file_flush(struct file *file, fl_owner_t id) ++#else ++static int yaffs_file_flush(struct file *file) ++#endif ++{ ++ struct yaffs_obj *obj = yaffs_dentry_to_obj(file->f_dentry); ++ ++ struct yaffs_dev *dev = obj->my_dev; ++ ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_file_flush object %d (%s)", ++ obj->obj_id, ++ obj->dirty ? "dirty" : "clean"); ++ ++ yaffs_gross_lock(dev); ++ ++ yaffs_flush_file(obj, 1, 0); ++ ++ yaffs_gross_unlock(dev); ++ ++ return 0; ++} ++ ++ ++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39)) ++static int yaffs_sync_object(struct file *file, loff_t start, loff_t end, int datasync) ++#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34)) ++static int yaffs_sync_object(struct file *file, int datasync) ++#else ++static int yaffs_sync_object(struct file *file, struct dentry *dentry, ++ int datasync) ++#endif ++{ ++ struct yaffs_obj *obj; ++ struct yaffs_dev *dev; ++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34)) ++ struct dentry *dentry = file->f_path.dentry; ++#endif ++ ++ obj = yaffs_dentry_to_obj(dentry); ++ ++ dev = obj->my_dev; ++ ++ yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, ++ "yaffs_sync_object"); ++ yaffs_gross_lock(dev); ++ yaffs_flush_file(obj, 1, datasync); ++ yaffs_gross_unlock(dev); ++ return 0; ++} ++ ++ ++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 22)) ++static const struct file_operations yaffs_file_operations = { ++ .read = do_sync_read, ++ .write = do_sync_write, ++ .aio_read = generic_file_aio_read, ++ .aio_write = generic_file_aio_write, ++ .mmap = generic_file_mmap, ++ .flush = yaffs_file_flush, ++ .fsync = yaffs_sync_object, ++ .splice_read = generic_file_splice_read, ++ .splice_write = generic_file_splice_write, ++ .llseek = generic_file_llseek, ++}; ++ ++#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18)) ++ ++static const struct file_operations yaffs_file_operations = { ++ .read = do_sync_read, ++ .write = do_sync_write, ++ .aio_read = generic_file_aio_read, ++ .aio_write = generic_file_aio_write, ++ .mmap = generic_file_mmap, ++ .flush = yaffs_file_flush, ++ .fsync = yaffs_sync_object, ++ .sendfile = generic_file_sendfile, ++}; ++ ++#else ++ ++static const struct file_operations yaffs_file_operations = { ++ .read = generic_file_read, ++ .write = generic_file_write, ++ .mmap = generic_file_mmap, ++ .flush = yaffs_file_flush, ++ .fsync = yaffs_sync_object, ++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) ++ .sendfile = generic_file_sendfile, ++#endif ++}; ++#endif ++ ++ ++ ++ ++#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25)) ++static void zero_user_segment(struct page *page, unsigned start, unsigned end) ++{ ++ void *kaddr = kmap_atomic(page, KM_USER0); ++ memset(kaddr + start, 0, end - start); ++ kunmap_atomic(kaddr, KM_USER0); ++ flush_dcache_page(page); ++} ++#endif ++ ++ ++static int yaffs_vfs_setsize(struct inode *inode, loff_t newsize) ++{ ++#ifdef YAFFS_USE_TRUNCATE_SETSIZE ++ truncate_setsize(inode, newsize); ++ return 0; ++#else ++ truncate_inode_pages(&inode->i_data, newsize); ++ return 0; ++#endif ++ ++} ++ ++ ++static int yaffs_vfs_setattr(struct inode *inode, struct iattr *attr) ++{ ++#ifdef YAFFS_USE_SETATTR_COPY ++ setattr_copy(inode, attr); ++ return 0; ++#else ++ return inode_setattr(inode, attr); ++#endif ++ ++} ++ ++static int yaffs_setattr(struct dentry *dentry, struct iattr *attr) ++{ ++ struct inode *inode = dentry->d_inode; ++ int error = 0; ++ struct yaffs_dev *dev; ++ ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_setattr of object %d", ++ yaffs_inode_to_obj(inode)->obj_id); ++#if 0 ++ /* Fail if a requested resize >= 2GB */ ++ if (attr->ia_valid & ATTR_SIZE && (attr->ia_size >> 31)) ++ error = -EINVAL; ++#endif ++ ++ if (error == 0) ++ error = inode_change_ok(inode, attr); ++ if (error == 0) { ++ int result; ++ if (!error) { ++ error = yaffs_vfs_setattr(inode, attr); ++ yaffs_trace(YAFFS_TRACE_OS, "inode_setattr called"); ++ if (attr->ia_valid & ATTR_SIZE) { ++ yaffs_vfs_setsize(inode, attr->ia_size); ++ inode->i_blocks = (inode->i_size + 511) >> 9; ++ } ++ } ++ dev = yaffs_inode_to_obj(inode)->my_dev; ++ if (attr->ia_valid & ATTR_SIZE) { ++ yaffs_trace(YAFFS_TRACE_OS, ++ "resize to %d(%x)", ++ (int)(attr->ia_size), ++ (int)(attr->ia_size)); ++ } ++ yaffs_gross_lock(dev); ++ result = yaffs_set_attribs(yaffs_inode_to_obj(inode), attr); ++ if (result == YAFFS_OK) { ++ error = 0; ++ } else { ++ error = -EPERM; ++ } ++ yaffs_gross_unlock(dev); ++ ++ } ++ ++ yaffs_trace(YAFFS_TRACE_OS, "yaffs_setattr done returning %d", error); ++ ++ return error; ++} ++ ++static int yaffs_setxattr(struct dentry *dentry, const char *name, ++ const void *value, size_t size, int flags) ++{ ++ struct inode *inode = dentry->d_inode; ++ int error = 0; ++ struct yaffs_dev *dev; ++ struct yaffs_obj *obj = yaffs_inode_to_obj(inode); ++ ++ yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr of object %d", obj->obj_id); ++ ++ if (error == 0) { ++ int result; ++ dev = obj->my_dev; ++ yaffs_gross_lock(dev); ++ result = yaffs_set_xattrib(obj, name, value, size, flags); ++ if (result == YAFFS_OK) ++ error = 0; ++ else if (result < 0) ++ error = result; ++ yaffs_gross_unlock(dev); ++ ++ } ++ yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr done returning %d", error); ++ ++ return error; ++} ++ ++static ssize_t yaffs_getxattr(struct dentry * dentry, const char *name, ++ void *buff, size_t size) ++{ ++ struct inode *inode = dentry->d_inode; ++ int error = 0; ++ struct yaffs_dev *dev; ++ struct yaffs_obj *obj = yaffs_inode_to_obj(inode); ++ ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_getxattr \"%s\" from object %d", ++ name, obj->obj_id); ++ ++ if (error == 0) { ++ dev = obj->my_dev; ++ yaffs_gross_lock(dev); ++ error = yaffs_get_xattrib(obj, name, buff, size); ++ yaffs_gross_unlock(dev); ++ ++ } ++ yaffs_trace(YAFFS_TRACE_OS, "yaffs_getxattr done returning %d", error); ++ ++ return error; ++} ++ ++static int yaffs_removexattr(struct dentry *dentry, const char *name) ++{ ++ struct inode *inode = dentry->d_inode; ++ int error = 0; ++ struct yaffs_dev *dev; ++ struct yaffs_obj *obj = yaffs_inode_to_obj(inode); ++ ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_removexattr of object %d", obj->obj_id); ++ ++ if (error == 0) { ++ int result; ++ dev = obj->my_dev; ++ yaffs_gross_lock(dev); ++ result = yaffs_remove_xattrib(obj, name); ++ if (result == YAFFS_OK) ++ error = 0; ++ else if (result < 0) ++ error = result; ++ yaffs_gross_unlock(dev); ++ ++ } ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_removexattr done returning %d", error); ++ ++ return error; ++} ++ ++static ssize_t yaffs_listxattr(struct dentry * dentry, char *buff, size_t size) ++{ ++ struct inode *inode = dentry->d_inode; ++ int error = 0; ++ struct yaffs_dev *dev; ++ struct yaffs_obj *obj = yaffs_inode_to_obj(inode); ++ ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_listxattr of object %d", obj->obj_id); ++ ++ if (error == 0) { ++ dev = obj->my_dev; ++ yaffs_gross_lock(dev); ++ error = yaffs_list_xattrib(obj, buff, size); ++ yaffs_gross_unlock(dev); ++ ++ } ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_listxattr done returning %d", error); ++ ++ return error; ++} ++ ++ ++static const struct inode_operations yaffs_file_inode_operations = { ++ .setattr = yaffs_setattr, ++ .setxattr = yaffs_setxattr, ++ .getxattr = yaffs_getxattr, ++ .listxattr = yaffs_listxattr, ++ .removexattr = yaffs_removexattr, ++}; ++ ++ ++static int yaffs_readlink(struct dentry *dentry, char __user * buffer, ++ int buflen) ++{ ++ unsigned char *alias; ++ int ret; ++ ++ struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev; ++ ++ yaffs_gross_lock(dev); ++ ++ alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry)); ++ ++ yaffs_gross_unlock(dev); ++ ++ if (!alias) ++ return -ENOMEM; ++ ++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 15, 0)) ++ ret = readlink_copy(buffer, buflen, alias); ++#else ++ ret = vfs_readlink(dentry, buffer, buflen, alias); ++#endif ++ kfree(alias); ++ return ret; ++} ++ ++#if (YAFFS_NEW_FOLLOW_LINK == 1) ++static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd) ++{ ++ void *ret; ++#else ++static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd) ++{ ++ int ret ++#endif ++ unsigned char *alias; ++ int ret_int = 0; ++ struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev; ++ ++ yaffs_gross_lock(dev); ++ ++ alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry)); ++ yaffs_gross_unlock(dev); ++ ++ if (!alias) { ++ ret_int = -ENOMEM; ++ goto out; ++ } ++#if (YAFFS_NEW_FOLLOW_LINK == 1) ++ nd_set_link(nd, alias); ++ ret = alias; ++out: ++ if (ret_int) ++ ret = ERR_PTR(ret_int); ++ return ret; ++#else ++ ret = vfs_follow_link(nd, alias); ++ kfree(alias); ++out: ++ if (ret_int) ++ ret = ret_int; ++ return ret; ++#endif ++} ++ ++ ++#ifdef YAFFS_HAS_PUT_INODE ++ ++/* For now put inode is just for debugging ++ * Put inode is called when the inode **structure** is put. ++ */ ++static void yaffs_put_inode(struct inode *inode) ++{ ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_put_inode: ino %d, count %d"), ++ (int)inode->i_ino, atomic_read(&inode->i_count); ++ ++} ++#endif ++ ++#if (YAFFS_NEW_FOLLOW_LINK == 1) ++void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias) ++{ ++ kfree(alias); ++} ++#endif ++ ++static const struct inode_operations yaffs_symlink_inode_operations = { ++ .readlink = yaffs_readlink, ++ .follow_link = yaffs_follow_link, ++#if (YAFFS_NEW_FOLLOW_LINK == 1) ++ .put_link = yaffs_put_link, ++#endif ++ .setattr = yaffs_setattr, ++ .setxattr = yaffs_setxattr, ++ .getxattr = yaffs_getxattr, ++ .listxattr = yaffs_listxattr, ++ .removexattr = yaffs_removexattr, ++}; ++ ++#ifdef YAFFS_USE_OWN_IGET ++ ++static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino) ++{ ++ struct inode *inode; ++ struct yaffs_obj *obj; ++ struct yaffs_dev *dev = yaffs_super_to_dev(sb); ++ ++ yaffs_trace(YAFFS_TRACE_OS, "yaffs_iget for %lu", ino); ++ ++ inode = iget_locked(sb, ino); ++ if (!inode) ++ return ERR_PTR(-ENOMEM); ++ if (!(inode->i_state & I_NEW)) ++ return inode; ++ ++ /* NB This is called as a side effect of other functions, but ++ * we had to release the lock to prevent deadlocks, so ++ * need to lock again. ++ */ ++ ++ yaffs_gross_lock(dev); ++ ++ obj = yaffs_find_by_number(dev, inode->i_ino); ++ ++ yaffs_fill_inode_from_obj(inode, obj); ++ ++ yaffs_gross_unlock(dev); ++ ++ unlock_new_inode(inode); ++ return inode; ++} ++ ++#else ++ ++static void yaffs_read_inode(struct inode *inode) ++{ ++ /* NB This is called as a side effect of other functions, but ++ * we had to release the lock to prevent deadlocks, so ++ * need to lock again. ++ */ ++ ++ struct yaffs_obj *obj; ++ struct yaffs_dev *dev = yaffs_super_to_dev(inode->i_sb); ++ ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_read_inode for %d", (int)inode->i_ino); ++ ++ if (current != yaffs_dev_to_lc(dev)->readdir_process) ++ yaffs_gross_lock(dev); ++ ++ obj = yaffs_find_by_number(dev, inode->i_ino); ++ ++ yaffs_fill_inode_from_obj(inode, obj); ++ ++ if (current != yaffs_dev_to_lc(dev)->readdir_process) ++ yaffs_gross_unlock(dev); ++} ++ ++#endif ++ ++ ++ ++struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev, ++ struct yaffs_obj *obj) ++{ ++ struct inode *inode; ++ ++ if (!sb) { ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_get_inode for NULL super_block!!"); ++ return NULL; ++ ++ } ++ ++ if (!obj) { ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_get_inode for NULL object!!"); ++ return NULL; ++ ++ } ++ ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_get_inode for object %d", obj->obj_id); ++ ++ inode = Y_IGET(sb, obj->obj_id); ++ if (IS_ERR(inode)) ++ return NULL; ++ ++ /* NB Side effect: iget calls back to yaffs_read_inode(). */ ++ /* iget also increments the inode's i_count */ ++ /* NB You can't be holding gross_lock or deadlock will happen! */ ++ ++ return inode; ++} ++ ++ ++ ++#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29) ++#define YCRED(x) x ++#else ++#define YCRED(x) (x->cred) ++#endif ++ ++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 4, 0)) ++static int yaffs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, ++ dev_t rdev) ++#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) ++static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, ++ dev_t rdev) ++#else ++static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, ++ int rdev) ++#endif ++{ ++ struct inode *inode; ++ ++ struct yaffs_obj *obj = NULL; ++ struct yaffs_dev *dev; ++ ++ struct yaffs_obj *parent = yaffs_inode_to_obj(dir); ++ ++ int error = -ENOSPC; ++ uid_t uid = YCRED_FSUID(); ++ gid_t gid = ++ (dir->i_mode & S_ISGID) ? i_gid_read(dir) : YCRED_FSGID(); ++ ++ if ((dir->i_mode & S_ISGID) && S_ISDIR(mode)) ++ mode |= S_ISGID; ++ ++ if (parent) { ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_mknod: parent object %d type %d", ++ parent->obj_id, parent->variant_type); ++ } else { ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_mknod: could not get parent object"); ++ return -EPERM; ++ } ++ ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_mknod: making oject for %s, mode %x dev %x", ++ dentry->d_name.name, mode, rdev); ++ ++ dev = parent->my_dev; ++ ++ yaffs_gross_lock(dev); ++ ++ switch (mode & S_IFMT) { ++ default: ++ /* Special (socket, fifo, device...) */ ++ yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making special"); ++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) ++ obj = ++ yaffs_create_special(parent, dentry->d_name.name, mode, uid, ++ gid, old_encode_dev(rdev)); ++#else ++ obj = ++ yaffs_create_special(parent, dentry->d_name.name, mode, uid, ++ gid, rdev); ++#endif ++ break; ++ case S_IFREG: /* file */ ++ yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making file"); ++ obj = yaffs_create_file(parent, dentry->d_name.name, mode, uid, ++ gid); ++ break; ++ case S_IFDIR: /* directory */ ++ yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making directory"); ++ obj = yaffs_create_dir(parent, dentry->d_name.name, mode, ++ uid, gid); ++ break; ++ case S_IFLNK: /* symlink */ ++ yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making symlink"); ++ obj = NULL; /* Do we ever get here? */ ++ break; ++ } ++ ++ /* Can not call yaffs_get_inode() with gross lock held */ ++ yaffs_gross_unlock(dev); ++ ++ if (obj) { ++ inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj); ++ d_instantiate(dentry, inode); ++ update_dir_time(dir); ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_mknod created object %d count = %d", ++ obj->obj_id, atomic_read(&inode->i_count)); ++ error = 0; ++ yaffs_fill_inode_from_obj(dir, parent); ++ } else { ++ yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod failed making object"); ++ error = -ENOMEM; ++ } ++ ++ return error; ++} ++ ++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 4, 0)) ++static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) ++#else ++static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode) ++#endif ++{ ++ int ret_val; ++ yaffs_trace(YAFFS_TRACE_OS, "yaffs_mkdir"); ++ ret_val = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0); ++ return ret_val; ++} ++ ++ ++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 6, 0)) ++static int yaffs_create(struct inode *dir, struct dentry *dentry, umode_t mode, ++ bool dummy) ++#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 4, 0)) ++static int yaffs_create(struct inode *dir, struct dentry *dentry, umode_t mode, ++ struct nameidata *n) ++#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) ++static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode, ++ struct nameidata *n) ++#else ++static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode) ++#endif ++{ ++ yaffs_trace(YAFFS_TRACE_OS, "yaffs_create"); ++ return yaffs_mknod(dir, dentry, mode | S_IFREG, 0); ++} ++ ++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 6, 0)) ++static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry, ++ unsigned int dummy) ++#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) ++static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry, ++ struct nameidata *n) ++#else ++static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry) ++#endif ++{ ++ struct yaffs_obj *obj; ++ struct inode *inode = NULL; /* NCB 2.5/2.6 needs NULL here */ ++ ++ struct yaffs_dev *dev = yaffs_inode_to_obj(dir)->my_dev; ++ ++ if (current != yaffs_dev_to_lc(dev)->readdir_process) ++ yaffs_gross_lock(dev); ++ ++ yaffs_trace(YAFFS_TRACE_OS, "yaffs_lookup for %d:%s", ++ yaffs_inode_to_obj(dir)->obj_id, dentry->d_name.name); ++ ++ obj = yaffs_find_by_name(yaffs_inode_to_obj(dir), dentry->d_name.name); ++ ++ obj = yaffs_get_equivalent_obj(obj); /* in case it was a hardlink */ ++ ++ /* Can't hold gross lock when calling yaffs_get_inode() */ ++ if (current != yaffs_dev_to_lc(dev)->readdir_process) ++ yaffs_gross_unlock(dev); ++ ++ if (obj) { ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_lookup found %d", obj->obj_id); ++ ++ inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj); ++ } else { ++ yaffs_trace(YAFFS_TRACE_OS, "yaffs_lookup not found"); ++ ++ } ++ ++/* added NCB for 2.5/6 compatability - forces add even if inode is ++ * NULL which creates dentry hash */ ++ d_add(dentry, inode); ++ ++ return NULL; ++} ++ ++/* ++ * Create a link... ++ */ ++static int yaffs_link(struct dentry *old_dentry, struct inode *dir, ++ struct dentry *dentry) ++{ ++ struct inode *inode = old_dentry->d_inode; ++ struct yaffs_obj *obj = NULL; ++ struct yaffs_obj *link = NULL; ++ struct yaffs_dev *dev; ++ ++ yaffs_trace(YAFFS_TRACE_OS, "yaffs_link"); ++ ++ obj = yaffs_inode_to_obj(inode); ++ dev = obj->my_dev; ++ ++ yaffs_gross_lock(dev); ++ ++ if (!S_ISDIR(inode->i_mode)) /* Don't link directories */ ++ link = ++ yaffs_link_obj(yaffs_inode_to_obj(dir), dentry->d_name.name, ++ obj); ++ ++ if (link) { ++ set_nlink(old_dentry->d_inode, yaffs_get_obj_link_count(obj)); ++ d_instantiate(dentry, old_dentry->d_inode); ++ atomic_inc(&old_dentry->d_inode->i_count); ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_link link count %d i_count %d", ++ old_dentry->d_inode->i_nlink, ++ atomic_read(&old_dentry->d_inode->i_count)); ++ } ++ ++ yaffs_gross_unlock(dev); ++ ++ if (link) { ++ update_dir_time(dir); ++ return 0; ++ } ++ ++ return -EPERM; ++} ++ ++static int yaffs_symlink(struct inode *dir, struct dentry *dentry, ++ const char *symname) ++{ ++ struct yaffs_obj *obj; ++ struct yaffs_dev *dev; ++ uid_t uid = YCRED_FSUID(); ++ gid_t gid = ++ (dir->i_mode & S_ISGID) ? i_gid_read(dir) : YCRED_FSGID(); ++ ++ yaffs_trace(YAFFS_TRACE_OS, "yaffs_symlink"); ++ ++ if (strnlen(dentry->d_name.name, YAFFS_MAX_NAME_LENGTH + 1) > ++ YAFFS_MAX_NAME_LENGTH) ++ return -ENAMETOOLONG; ++ ++ if (strnlen(symname, YAFFS_MAX_ALIAS_LENGTH + 1) > ++ YAFFS_MAX_ALIAS_LENGTH) ++ return -ENAMETOOLONG; ++ ++ dev = yaffs_inode_to_obj(dir)->my_dev; ++ yaffs_gross_lock(dev); ++ obj = yaffs_create_symlink(yaffs_inode_to_obj(dir), dentry->d_name.name, ++ S_IFLNK | S_IRWXUGO, uid, gid, symname); ++ yaffs_gross_unlock(dev); ++ ++ if (obj) { ++ struct inode *inode; ++ ++ inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj); ++ d_instantiate(dentry, inode); ++ update_dir_time(dir); ++ yaffs_trace(YAFFS_TRACE_OS, "symlink created OK"); ++ return 0; ++ } else { ++ yaffs_trace(YAFFS_TRACE_OS, "symlink not created"); ++ } ++ ++ return -ENOMEM; ++} ++ ++/* ++ * The VFS layer already does all the dentry stuff for rename. ++ * ++ * NB: POSIX says you can rename an object over an old object of the same name ++ */ ++static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry, ++ struct inode *new_dir, struct dentry *new_dentry) ++{ ++ struct yaffs_dev *dev; ++ int ret_val = YAFFS_FAIL; ++ struct yaffs_obj *target; ++ ++ yaffs_trace(YAFFS_TRACE_OS, "yaffs_rename"); ++ dev = yaffs_inode_to_obj(old_dir)->my_dev; ++ ++ yaffs_gross_lock(dev); ++ ++ /* Check if the target is an existing directory that is not empty. */ ++ target = yaffs_find_by_name(yaffs_inode_to_obj(new_dir), ++ new_dentry->d_name.name); ++ ++ if (target && target->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY && ++ !list_empty(&target->variant.dir_variant.children)) { ++ ++ yaffs_trace(YAFFS_TRACE_OS, "target is non-empty dir"); ++ ++ ret_val = YAFFS_FAIL; ++ } else { ++ /* Now does unlinking internally using shadowing mechanism */ ++ yaffs_trace(YAFFS_TRACE_OS, "calling yaffs_rename_obj"); ++ ++ ret_val = yaffs_rename_obj(yaffs_inode_to_obj(old_dir), ++ old_dentry->d_name.name, ++ yaffs_inode_to_obj(new_dir), ++ new_dentry->d_name.name); ++ } ++ yaffs_gross_unlock(dev); ++ ++ if (ret_val == YAFFS_OK) { ++ if (target) ++ inode_dec_link_count(new_dentry->d_inode); ++ ++ update_dir_time(old_dir); ++ if (old_dir != new_dir) ++ update_dir_time(new_dir); ++ return 0; ++ } else { ++ return -ENOTEMPTY; ++ } ++} ++ ++ ++ ++ ++static int yaffs_unlink(struct inode *dir, struct dentry *dentry) ++{ ++ int ret_val; ++ ++ struct yaffs_dev *dev; ++ struct yaffs_obj *obj; ++ ++ yaffs_trace(YAFFS_TRACE_OS, "yaffs_unlink %d:%s", ++ (int)(dir->i_ino), dentry->d_name.name); ++ obj = yaffs_inode_to_obj(dir); ++ dev = obj->my_dev; ++ ++ yaffs_gross_lock(dev); ++ ++ ret_val = yaffs_unlinker(obj, dentry->d_name.name); ++ ++ if (ret_val == YAFFS_OK) { ++ inode_dec_link_count(dentry->d_inode); ++ dir->i_version++; ++ yaffs_gross_unlock(dev); ++ update_dir_time(dir); ++ return 0; ++ } ++ yaffs_gross_unlock(dev); ++ return -ENOTEMPTY; ++} ++ ++ ++ ++static const struct inode_operations yaffs_dir_inode_operations = { ++ .create = yaffs_create, ++ .lookup = yaffs_lookup, ++ .link = yaffs_link, ++ .unlink = yaffs_unlink, ++ .symlink = yaffs_symlink, ++ .mkdir = yaffs_mkdir, ++ .rmdir = yaffs_unlink, ++ .mknod = yaffs_mknod, ++ .rename = yaffs_rename, ++ .setattr = yaffs_setattr, ++ .setxattr = yaffs_setxattr, ++ .getxattr = yaffs_getxattr, ++ .listxattr = yaffs_listxattr, ++ .removexattr = yaffs_removexattr, ++}; ++ ++/*-----------------------------------------------------------------*/ ++/* Directory search context allows us to unlock access to yaffs during ++ * filldir without causing problems with the directory being modified. ++ * This is similar to the tried and tested mechanism used in yaffs direct. ++ * ++ * A search context iterates along a doubly linked list of siblings in the ++ * directory. If the iterating object is deleted then this would corrupt ++ * the list iteration, likely causing a crash. The search context avoids ++ * this by using the remove_obj_fn to move the search context to the ++ * next object before the object is deleted. ++ * ++ * Many readdirs (and thus seach conexts) may be alive simulateously so ++ * each struct yaffs_dev has a list of these. ++ * ++ * A seach context lives for the duration of a readdir. ++ * ++ * All these functions must be called while yaffs is locked. ++ */ ++ ++struct yaffs_search_context { ++ struct yaffs_dev *dev; ++ struct yaffs_obj *dir_obj; ++ struct yaffs_obj *next_return; ++ struct list_head others; ++}; ++ ++/* ++ * yaffs_new_search() creates a new search context, initialises it and ++ * adds it to the device's search context list. ++ * ++ * Called at start of readdir. ++ */ ++static struct yaffs_search_context *yaffs_new_search(struct yaffs_obj *dir) ++{ ++ struct yaffs_dev *dev = dir->my_dev; ++ struct yaffs_search_context *sc = ++ kmalloc(sizeof(struct yaffs_search_context), GFP_NOFS); ++ if (sc) { ++ sc->dir_obj = dir; ++ sc->dev = dev; ++ if (list_empty(&sc->dir_obj->variant.dir_variant.children)) ++ sc->next_return = NULL; ++ else ++ sc->next_return = ++ list_entry(dir->variant.dir_variant.children.next, ++ struct yaffs_obj, siblings); ++ INIT_LIST_HEAD(&sc->others); ++ list_add(&sc->others, &(yaffs_dev_to_lc(dev)->search_contexts)); ++ } ++ return sc; ++} ++ ++/* ++ * yaffs_search_end() disposes of a search context and cleans up. ++ */ ++static void yaffs_search_end(struct yaffs_search_context *sc) ++{ ++ if (sc) { ++ list_del(&sc->others); ++ kfree(sc); ++ } ++} ++ ++/* ++ * yaffs_search_advance() moves a search context to the next object. ++ * Called when the search iterates or when an object removal causes ++ * the search context to be moved to the next object. ++ */ ++static void yaffs_search_advance(struct yaffs_search_context *sc) ++{ ++ if (!sc) ++ return; ++ ++ if (sc->next_return == NULL || ++ list_empty(&sc->dir_obj->variant.dir_variant.children)) ++ sc->next_return = NULL; ++ else { ++ struct list_head *next = sc->next_return->siblings.next; ++ ++ if (next == &sc->dir_obj->variant.dir_variant.children) ++ sc->next_return = NULL; /* end of list */ ++ else ++ sc->next_return = ++ list_entry(next, struct yaffs_obj, siblings); ++ } ++} ++ ++/* ++ * yaffs_remove_obj_callback() is called when an object is unlinked. ++ * We check open search contexts and advance any which are currently ++ * on the object being iterated. ++ */ ++static void yaffs_remove_obj_callback(struct yaffs_obj *obj) ++{ ++ ++ struct list_head *i; ++ struct yaffs_search_context *sc; ++ struct list_head *search_contexts = ++ &(yaffs_dev_to_lc(obj->my_dev)->search_contexts); ++ ++ /* Iterate through the directory search contexts. ++ * If any are currently on the object being removed, then advance ++ * the search context to the next object to prevent a hanging pointer. ++ */ ++ list_for_each(i, search_contexts) { ++ sc = list_entry(i, struct yaffs_search_context, others); ++ if (sc->next_return == obj) ++ yaffs_search_advance(sc); ++ } ++ ++} ++ ++ ++/*-----------------------------------------------------------------*/ ++ ++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 12, 0)) ++static int yaffs_readdir(struct file *file, struct dir_context *ctx) ++{ ++ struct yaffs_obj *obj; ++ struct yaffs_dev *dev; ++ struct yaffs_search_context *sc; ++ struct inode *inode = file->f_dentry->d_inode; ++ unsigned long offset, curoffs; ++ struct yaffs_obj *l; ++ int ret_val = 0; ++ ++ char name[YAFFS_MAX_NAME_LENGTH + 1]; ++ ++ obj = yaffs_dentry_to_obj(file->f_dentry); ++ dev = obj->my_dev; ++ ++ yaffs_gross_lock(dev); ++ ++ yaffs_dev_to_lc(dev)->readdir_process = current; ++ ++ offset = ctx->pos; ++ ++ sc = yaffs_new_search(obj); ++ if (!sc) { ++ ret_val = -ENOMEM; ++ goto out; ++ } ++ ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_readdir: starting at %d", (int)offset); ++ ++ if (offset == 0) { ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_readdir: entry . ino %d", ++ (int)inode->i_ino); ++ yaffs_gross_unlock(dev); ++ if (!dir_emit_dot(file, ctx)) { ++ yaffs_gross_lock(dev); ++ goto out; ++ } ++ yaffs_gross_lock(dev); ++ offset++; ++ ctx->pos++; ++ } ++ if (offset == 1) { ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_readdir: entry .. ino %d", ++ (int)file->f_dentry->d_parent->d_inode->i_ino); ++ yaffs_gross_unlock(dev); ++ if (!dir_emit_dotdot(file, ctx)) { ++ yaffs_gross_lock(dev); ++ goto out; ++ } ++ yaffs_gross_lock(dev); ++ offset++; ++ ctx->pos++; ++ } ++ ++ curoffs = 1; ++ ++ /* If the directory has changed since the open or last call to ++ readdir, rewind to after the 2 canned entries. */ ++ if (file->f_version != inode->i_version) { ++ offset = 2; ++ ctx->pos = offset; ++ file->f_version = inode->i_version; ++ } ++ ++ while (sc->next_return) { ++ curoffs++; ++ l = sc->next_return; ++ if (curoffs >= offset) { ++ int this_inode = yaffs_get_obj_inode(l); ++ int this_type = yaffs_get_obj_type(l); ++ ++ yaffs_get_obj_name(l, name, YAFFS_MAX_NAME_LENGTH + 1); ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_readdir: %s inode %d", ++ name, yaffs_get_obj_inode(l)); ++ ++ yaffs_gross_unlock(dev); ++ ++ if (!dir_emit(ctx, name, strlen(name), ++ this_inode, this_type) < 0) { ++ yaffs_gross_lock(dev); ++ goto out; ++ } ++ ++ yaffs_gross_lock(dev); ++ ++ offset++; ++ ctx->pos++; ++ } ++ yaffs_search_advance(sc); ++ } ++ ++out: ++ yaffs_search_end(sc); ++ yaffs_dev_to_lc(dev)->readdir_process = NULL; ++ yaffs_gross_unlock(dev); ++ ++ return ret_val; ++} ++#else ++static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir) ++{ ++ struct yaffs_obj *obj; ++ struct yaffs_dev *dev; ++ struct yaffs_search_context *sc; ++ struct inode *inode = f->f_dentry->d_inode; ++ unsigned long offset, curoffs; ++ struct yaffs_obj *l; ++ int ret_val = 0; ++ ++ char name[YAFFS_MAX_NAME_LENGTH + 1]; ++ ++ obj = yaffs_dentry_to_obj(f->f_dentry); ++ dev = obj->my_dev; ++ ++ yaffs_gross_lock(dev); ++ ++ yaffs_dev_to_lc(dev)->readdir_process = current; ++ ++ offset = f->f_pos; ++ ++ sc = yaffs_new_search(obj); ++ if (!sc) { ++ ret_val = -ENOMEM; ++ goto out; ++ } ++ ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_readdir: starting at %d", (int)offset); ++ ++ if (offset == 0) { ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_readdir: entry . ino %d", ++ (int)inode->i_ino); ++ yaffs_gross_unlock(dev); ++ if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0) { ++ yaffs_gross_lock(dev); ++ goto out; ++ } ++ yaffs_gross_lock(dev); ++ offset++; ++ f->f_pos++; ++ } ++ if (offset == 1) { ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_readdir: entry .. ino %d", ++ (int)f->f_dentry->d_parent->d_inode->i_ino); ++ yaffs_gross_unlock(dev); ++ if (filldir(dirent, "..", 2, offset, ++ f->f_dentry->d_parent->d_inode->i_ino, ++ DT_DIR) < 0) { ++ yaffs_gross_lock(dev); ++ goto out; ++ } ++ yaffs_gross_lock(dev); ++ offset++; ++ f->f_pos++; ++ } ++ ++ curoffs = 1; ++ ++ /* If the directory has changed since the open or last call to ++ readdir, rewind to after the 2 canned entries. */ ++ if (f->f_version != inode->i_version) { ++ offset = 2; ++ f->f_pos = offset; ++ f->f_version = inode->i_version; ++ } ++ ++ while (sc->next_return) { ++ curoffs++; ++ l = sc->next_return; ++ if (curoffs >= offset) { ++ int this_inode = yaffs_get_obj_inode(l); ++ int this_type = yaffs_get_obj_type(l); ++ ++ yaffs_get_obj_name(l, name, YAFFS_MAX_NAME_LENGTH + 1); ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_readdir: %s inode %d", ++ name, yaffs_get_obj_inode(l)); ++ ++ yaffs_gross_unlock(dev); ++ ++ if (filldir(dirent, ++ name, ++ strlen(name), ++ offset, this_inode, this_type) < 0) { ++ yaffs_gross_lock(dev); ++ goto out; ++ } ++ ++ yaffs_gross_lock(dev); ++ ++ offset++; ++ f->f_pos++; ++ } ++ yaffs_search_advance(sc); ++ } ++ ++out: ++ yaffs_search_end(sc); ++ yaffs_dev_to_lc(dev)->readdir_process = NULL; ++ yaffs_gross_unlock(dev); ++ ++ return ret_val; ++} ++#endif ++ ++static const struct file_operations yaffs_dir_operations = { ++ .read = generic_read_dir, ++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 12, 0)) ++ .iterate = yaffs_readdir, ++#else ++ .readdir = yaffs_readdir, ++#endif ++ .fsync = yaffs_sync_object, ++ .llseek = generic_file_llseek, ++}; ++ ++static void yaffs_fill_inode_from_obj(struct inode *inode, ++ struct yaffs_obj *obj) ++{ ++ if (inode && obj) { ++ ++ /* Check mode against the variant type and attempt to repair if broken. */ ++ u32 mode = obj->yst_mode; ++ switch (obj->variant_type) { ++ case YAFFS_OBJECT_TYPE_FILE: ++ if (!S_ISREG(mode)) { ++ obj->yst_mode &= ~S_IFMT; ++ obj->yst_mode |= S_IFREG; ++ } ++ ++ break; ++ case YAFFS_OBJECT_TYPE_SYMLINK: ++ if (!S_ISLNK(mode)) { ++ obj->yst_mode &= ~S_IFMT; ++ obj->yst_mode |= S_IFLNK; ++ } ++ ++ break; ++ case YAFFS_OBJECT_TYPE_DIRECTORY: ++ if (!S_ISDIR(mode)) { ++ obj->yst_mode &= ~S_IFMT; ++ obj->yst_mode |= S_IFDIR; ++ } ++ ++ break; ++ case YAFFS_OBJECT_TYPE_UNKNOWN: ++ case YAFFS_OBJECT_TYPE_HARDLINK: ++ case YAFFS_OBJECT_TYPE_SPECIAL: ++ default: ++ /* TODO? */ ++ break; ++ } ++ ++ inode->i_flags |= S_NOATIME; ++ ++ inode->i_ino = obj->obj_id; ++ inode->i_mode = obj->yst_mode; ++ i_uid_write(inode, obj->yst_uid); ++ i_gid_write(inode, obj->yst_gid); ++#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19)) ++ inode->i_blksize = inode->i_sb->s_blocksize; ++#endif ++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) ++ ++ inode->i_rdev = old_decode_dev(obj->yst_rdev); ++ inode->i_atime.tv_sec = (time_t) (obj->yst_atime); ++ inode->i_atime.tv_nsec = 0; ++ inode->i_mtime.tv_sec = (time_t) obj->yst_mtime; ++ inode->i_mtime.tv_nsec = 0; ++ inode->i_ctime.tv_sec = (time_t) obj->yst_ctime; ++ inode->i_ctime.tv_nsec = 0; ++#else ++ inode->i_rdev = obj->yst_rdev; ++ inode->i_atime = obj->yst_atime; ++ inode->i_mtime = obj->yst_mtime; ++ inode->i_ctime = obj->yst_ctime; ++#endif ++ inode->i_size = yaffs_get_obj_length(obj); ++ inode->i_blocks = (inode->i_size + 511) >> 9; ++ ++ set_nlink(inode, yaffs_get_obj_link_count(obj)); ++ ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_fill_inode mode %x uid %d gid %d size %lld count %d", ++ inode->i_mode, i_uid_read(inode), i_gid_read(inode), ++ inode->i_size, atomic_read(&inode->i_count)); ++ ++ switch (obj->yst_mode & S_IFMT) { ++ default: /* fifo, device or socket */ ++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) ++ init_special_inode(inode, obj->yst_mode, ++ old_decode_dev(obj->yst_rdev)); ++#else ++ init_special_inode(inode, obj->yst_mode, ++ (dev_t) (obj->yst_rdev)); ++#endif ++ break; ++ case S_IFREG: /* file */ ++ inode->i_op = &yaffs_file_inode_operations; ++ inode->i_fop = &yaffs_file_operations; ++ inode->i_mapping->a_ops = ++ &yaffs_file_address_operations; ++ break; ++ case S_IFDIR: /* directory */ ++ inode->i_op = &yaffs_dir_inode_operations; ++ inode->i_fop = &yaffs_dir_operations; ++ break; ++ case S_IFLNK: /* symlink */ ++ inode->i_op = &yaffs_symlink_inode_operations; ++ break; ++ } ++ ++ yaffs_inode_to_obj_lv(inode) = obj; ++ ++ obj->my_inode = inode; ++ ++ } else { ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_fill_inode invalid parameters"); ++ } ++ ++} ++ ++ ++ ++/* ++ * yaffs background thread functions . ++ * yaffs_bg_thread_fn() the thread function ++ * yaffs_bg_start() launches the background thread. ++ * yaffs_bg_stop() cleans up the background thread. ++ * ++ * NB: ++ * The thread should only run after the yaffs is initialised ++ * The thread should be stopped before yaffs is unmounted. ++ * The thread should not do any writing while the fs is in read only. ++ */ ++ ++static unsigned yaffs_bg_gc_urgency(struct yaffs_dev *dev) ++{ ++ unsigned erased_chunks = ++ dev->n_erased_blocks * dev->param.chunks_per_block; ++ struct yaffs_linux_context *context = yaffs_dev_to_lc(dev); ++ unsigned scattered = 0; /* Free chunks not in an erased block */ ++ ++ if (erased_chunks < dev->n_free_chunks) ++ scattered = (dev->n_free_chunks - erased_chunks); ++ ++ if (!context->bg_running) ++ return 0; ++ else if (scattered < (dev->param.chunks_per_block * 2)) ++ return 0; ++ else if (erased_chunks > dev->n_free_chunks / 2) ++ return 0; ++ else if (erased_chunks > dev->n_free_chunks / 4) ++ return 1; ++ else ++ return 2; ++} ++ ++#ifdef YAFFS_COMPILE_BACKGROUND ++ ++void yaffs_background_waker(unsigned long data) ++{ ++ wake_up_process((struct task_struct *)data); ++} ++ ++static int yaffs_bg_thread_fn(void *data) ++{ ++ struct yaffs_dev *dev = (struct yaffs_dev *)data; ++ struct yaffs_linux_context *context = yaffs_dev_to_lc(dev); ++ unsigned long now = jiffies; ++ unsigned long next_dir_update = now; ++ unsigned long next_gc = now; ++ unsigned long expires; ++ unsigned int urgency; ++ ++ int gc_result; ++ struct timer_list timer; ++ ++ yaffs_trace(YAFFS_TRACE_BACKGROUND, ++ "yaffs_background starting for dev %p", (void *)dev); ++ ++#ifdef YAFFS_COMPILE_FREEZER ++ set_freezable(); ++#endif ++ while (context->bg_running) { ++ yaffs_trace(YAFFS_TRACE_BACKGROUND, "yaffs_background"); ++ ++ if (kthread_should_stop()) ++ break; ++ ++#ifdef YAFFS_COMPILE_FREEZER ++ if (try_to_freeze()) ++ continue; ++#endif ++ yaffs_gross_lock(dev); ++ ++ now = jiffies; ++ ++ if (time_after(now, next_dir_update) && yaffs_bg_enable) { ++ yaffs_update_dirty_dirs(dev); ++ next_dir_update = now + HZ; ++ } ++ ++ if (time_after(now, next_gc) && yaffs_bg_enable) { ++ if (!dev->is_checkpointed) { ++ urgency = yaffs_bg_gc_urgency(dev); ++ gc_result = yaffs_bg_gc(dev, urgency); ++ if (urgency > 1) ++ next_gc = now + HZ / 20 + 1; ++ else if (urgency > 0) ++ next_gc = now + HZ / 10 + 1; ++ else ++ next_gc = now + HZ * 2; ++ } else { ++ /* ++ * gc not running so set to next_dir_update ++ * to cut down on wake ups ++ */ ++ next_gc = next_dir_update; ++ } ++ } ++ yaffs_gross_unlock(dev); ++#if 1 ++ expires = next_dir_update; ++ if (time_before(next_gc, expires)) ++ expires = next_gc; ++ if (time_before(expires, now)) ++ expires = now + HZ; ++ ++ Y_INIT_TIMER(&timer); ++ timer.expires = expires + 1; ++ timer.data = (unsigned long)current; ++ timer.function = yaffs_background_waker; ++ ++ set_current_state(TASK_INTERRUPTIBLE); ++ add_timer(&timer); ++ schedule(); ++ del_timer_sync(&timer); ++#else ++ msleep(10); ++#endif ++ } ++ ++ return 0; ++} ++ ++static int yaffs_bg_start(struct yaffs_dev *dev) ++{ ++ int retval = 0; ++ struct yaffs_linux_context *context = yaffs_dev_to_lc(dev); ++ ++ if (dev->read_only) ++ return -1; ++ ++ context->bg_running = 1; ++ ++ context->bg_thread = kthread_run(yaffs_bg_thread_fn, ++ (void *)dev, "yaffs-bg-%d", ++ context->mount_id); ++ ++ if (IS_ERR(context->bg_thread)) { ++ retval = PTR_ERR(context->bg_thread); ++ context->bg_thread = NULL; ++ context->bg_running = 0; ++ } ++ return retval; ++} ++ ++static void yaffs_bg_stop(struct yaffs_dev *dev) ++{ ++ struct yaffs_linux_context *ctxt = yaffs_dev_to_lc(dev); ++ ++ ctxt->bg_running = 0; ++ ++ if (ctxt->bg_thread) { ++ kthread_stop(ctxt->bg_thread); ++ ctxt->bg_thread = NULL; ++ } ++} ++#else ++static int yaffs_bg_thread_fn(void *data) ++{ ++ return 0; ++} ++ ++static int yaffs_bg_start(struct yaffs_dev *dev) ++{ ++ return 0; ++} ++ ++static void yaffs_bg_stop(struct yaffs_dev *dev) ++{ ++} ++#endif ++ ++ ++static void yaffs_flush_inodes(struct super_block *sb) ++{ ++ struct inode *iptr; ++ struct yaffs_obj *obj; ++ ++ list_for_each_entry(iptr, &sb->s_inodes, i_sb_list) { ++ obj = yaffs_inode_to_obj(iptr); ++ if (obj) { ++ yaffs_trace(YAFFS_TRACE_OS, ++ "flushing obj %d", ++ obj->obj_id); ++ yaffs_flush_file(obj, 1, 0); ++ } ++ } ++} ++ ++static void yaffs_flush_super(struct super_block *sb, int do_checkpoint) ++{ ++ struct yaffs_dev *dev = yaffs_super_to_dev(sb); ++ if (!dev) ++ return; ++ ++ yaffs_flush_inodes(sb); ++ yaffs_update_dirty_dirs(dev); ++ yaffs_flush_whole_cache(dev); ++ if (do_checkpoint) ++ yaffs_checkpoint_save(dev); ++} ++ ++static LIST_HEAD(yaffs_context_list); ++struct mutex yaffs_context_lock; ++ ++static void yaffs_put_super(struct super_block *sb) ++{ ++ struct yaffs_dev *dev = yaffs_super_to_dev(sb); ++ struct mtd_info *mtd = yaffs_dev_to_mtd(dev); ++ ++ yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_ALWAYS, ++ "yaffs_put_super"); ++ ++ yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND, ++ "Shutting down yaffs background thread"); ++ yaffs_bg_stop(dev); ++ yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND, ++ "yaffs background thread shut down"); ++ ++ yaffs_gross_lock(dev); ++ ++ yaffs_flush_super(sb, 1); ++ ++ yaffs_deinitialise(dev); ++ ++ yaffs_gross_unlock(dev); ++ ++ mutex_lock(&yaffs_context_lock); ++ list_del_init(&(yaffs_dev_to_lc(dev)->context_list)); ++ mutex_unlock(&yaffs_context_lock); ++ ++ if (yaffs_dev_to_lc(dev)->spare_buffer) { ++ kfree(yaffs_dev_to_lc(dev)->spare_buffer); ++ yaffs_dev_to_lc(dev)->spare_buffer = NULL; ++ } ++ ++ kfree(dev); ++ ++ yaffs_put_mtd_device(mtd); ++ ++ yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_ALWAYS, ++ "yaffs_put_super done"); ++} ++ ++ ++static unsigned yaffs_gc_control_callback(struct yaffs_dev *dev) ++{ ++ return yaffs_gc_control; ++} ++ ++ ++#ifdef YAFFS_COMPILE_EXPORTFS ++ ++static struct inode *yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino, ++ uint32_t generation) ++{ ++ return Y_IGET(sb, ino); ++} ++ ++static struct dentry *yaffs2_fh_to_dentry(struct super_block *sb, ++ struct fid *fid, int fh_len, ++ int fh_type) ++{ ++ return generic_fh_to_dentry(sb, fid, fh_len, fh_type, ++ yaffs2_nfs_get_inode); ++} ++ ++static struct dentry *yaffs2_fh_to_parent(struct super_block *sb, ++ struct fid *fid, int fh_len, ++ int fh_type) ++{ ++ return generic_fh_to_parent(sb, fid, fh_len, fh_type, ++ yaffs2_nfs_get_inode); ++} ++ ++struct dentry *yaffs2_get_parent(struct dentry *dentry) ++{ ++ ++ struct super_block *sb = dentry->d_inode->i_sb; ++ struct dentry *parent = ERR_PTR(-ENOENT); ++ struct inode *inode; ++ unsigned long parent_ino; ++ struct yaffs_obj *d_obj; ++ struct yaffs_obj *parent_obj; ++ ++ d_obj = yaffs_inode_to_obj(dentry->d_inode); ++ ++ if (d_obj) { ++ parent_obj = d_obj->parent; ++ if (parent_obj) { ++ parent_ino = yaffs_get_obj_inode(parent_obj); ++ inode = Y_IGET(sb, parent_ino); ++ ++ if (IS_ERR(inode)) { ++ parent = ERR_CAST(inode); ++ } else { ++ parent = d_obtain_alias(inode); ++ if (!IS_ERR(parent)) { ++ parent = ERR_PTR(-ENOMEM); ++ iput(inode); ++ } ++ } ++ } ++ } ++ ++ return parent; ++} ++ ++/* Just declare a zero structure as a NULL value implies ++ * using the default functions of exportfs. ++ */ ++ ++static struct export_operations yaffs_export_ops = { ++ .fh_to_dentry = yaffs2_fh_to_dentry, ++ .fh_to_parent = yaffs2_fh_to_parent, ++ .get_parent = yaffs2_get_parent, ++}; ++ ++#endif ++ ++static void yaffs_unstitch_obj(struct inode *inode, struct yaffs_obj *obj) ++{ ++ /* Clear the association between the inode and ++ * the struct yaffs_obj. ++ */ ++ obj->my_inode = NULL; ++ yaffs_inode_to_obj_lv(inode) = NULL; ++ ++ /* If the object freeing was deferred, then the real ++ * free happens now. ++ * This should fix the inode inconsistency problem. ++ */ ++ yaffs_handle_defered_free(obj); ++} ++ ++#ifdef YAFFS_HAS_EVICT_INODE ++/* yaffs_evict_inode combines into one operation what was previously done in ++ * yaffs_clear_inode() and yaffs_delete_inode() ++ * ++ */ ++static void yaffs_evict_inode(struct inode *inode) ++{ ++ struct yaffs_obj *obj; ++ struct yaffs_dev *dev; ++ int deleteme = 0; ++ ++ obj = yaffs_inode_to_obj(inode); ++ ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_evict_inode: ino %d, count %d %s", ++ (int)inode->i_ino, atomic_read(&inode->i_count), ++ obj ? "object exists" : "null object"); ++ ++ if (!inode->i_nlink && !is_bad_inode(inode)) ++ deleteme = 1; ++ truncate_inode_pages(&inode->i_data, 0); ++ Y_CLEAR_INODE(inode); ++ ++ if (deleteme && obj) { ++ dev = obj->my_dev; ++ yaffs_gross_lock(dev); ++ yaffs_del_obj(obj); ++ yaffs_gross_unlock(dev); ++ } ++ if (obj) { ++ dev = obj->my_dev; ++ yaffs_gross_lock(dev); ++ yaffs_unstitch_obj(inode, obj); ++ yaffs_gross_unlock(dev); ++ } ++} ++#else ++ ++/* clear is called to tell the fs to release any per-inode data it holds. ++ * The object might still exist on disk and is just being thrown out of the cache ++ * or else the object has actually been deleted and we're being called via ++ * the chain ++ * yaffs_delete_inode() -> clear_inode()->yaffs_clear_inode() ++ */ ++ ++static void yaffs_clear_inode(struct inode *inode) ++{ ++ struct yaffs_obj *obj; ++ struct yaffs_dev *dev; ++ ++ obj = yaffs_inode_to_obj(inode); ++ ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_clear_inode: ino %d, count %d %s", ++ (int)inode->i_ino, atomic_read(&inode->i_count), ++ obj ? "object exists" : "null object"); ++ ++ if (obj) { ++ dev = obj->my_dev; ++ yaffs_gross_lock(dev); ++ yaffs_unstitch_obj(inode, obj); ++ yaffs_gross_unlock(dev); ++ } ++ ++} ++ ++/* delete is called when the link count is zero and the inode ++ * is put (ie. nobody wants to know about it anymore, time to ++ * delete the file). ++ * NB Must call clear_inode() ++ */ ++static void yaffs_delete_inode(struct inode *inode) ++{ ++ struct yaffs_obj *obj = yaffs_inode_to_obj(inode); ++ struct yaffs_dev *dev; ++ ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_delete_inode: ino %d, count %d %s", ++ (int)inode->i_ino, atomic_read(&inode->i_count), ++ obj ? "object exists" : "null object"); ++ ++ if (obj) { ++ dev = obj->my_dev; ++ yaffs_gross_lock(dev); ++ yaffs_del_obj(obj); ++ yaffs_gross_unlock(dev); ++ } ++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13)) ++ truncate_inode_pages(&inode->i_data, 0); ++#endif ++ clear_inode(inode); ++} ++#endif ++ ++ ++ ++ ++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17)) ++static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf) ++{ ++ struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev; ++ struct super_block *sb = dentry->d_sb; ++#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) ++static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf) ++{ ++ struct yaffs_dev *dev = yaffs_super_to_dev(sb); ++#else ++static int yaffs_statfs(struct super_block *sb, struct statfs *buf) ++{ ++ struct yaffs_dev *dev = yaffs_super_to_dev(sb); ++#endif ++ ++ yaffs_trace(YAFFS_TRACE_OS, "yaffs_statfs"); ++ ++ yaffs_gross_lock(dev); ++ ++ buf->f_type = YAFFS_MAGIC; ++ buf->f_bsize = sb->s_blocksize; ++ buf->f_namelen = 255; ++ ++ if (dev->data_bytes_per_chunk & (dev->data_bytes_per_chunk - 1)) { ++ /* Do this if chunk size is not a power of 2 */ ++ ++ uint64_t bytes_in_dev; ++ uint64_t bytes_free; ++ ++ bytes_in_dev = ++ ((uint64_t) ++ ((dev->param.end_block - dev->param.start_block + ++ 1))) * ((uint64_t) (dev->param.chunks_per_block * ++ dev->data_bytes_per_chunk)); ++ ++ do_div(bytes_in_dev, sb->s_blocksize); /* bytes_in_dev becomes the number of blocks */ ++ buf->f_blocks = bytes_in_dev; ++ ++ bytes_free = ((uint64_t) (yaffs_get_n_free_chunks(dev))) * ++ ((uint64_t) (dev->data_bytes_per_chunk)); ++ ++ do_div(bytes_free, sb->s_blocksize); ++ ++ buf->f_bfree = bytes_free; ++ ++ } else if (sb->s_blocksize > dev->data_bytes_per_chunk) { ++ ++ buf->f_blocks = ++ (dev->param.end_block - dev->param.start_block + 1) * ++ dev->param.chunks_per_block / ++ (sb->s_blocksize / dev->data_bytes_per_chunk); ++ buf->f_bfree = ++ yaffs_get_n_free_chunks(dev) / ++ (sb->s_blocksize / dev->data_bytes_per_chunk); ++ } else { ++ buf->f_blocks = ++ (dev->param.end_block - dev->param.start_block + 1) * ++ dev->param.chunks_per_block * ++ (dev->data_bytes_per_chunk / sb->s_blocksize); ++ ++ buf->f_bfree = ++ yaffs_get_n_free_chunks(dev) * ++ (dev->data_bytes_per_chunk / sb->s_blocksize); ++ } ++ ++ buf->f_files = 0; ++ buf->f_ffree = 0; ++ buf->f_bavail = buf->f_bfree; ++ ++ yaffs_gross_unlock(dev); ++ return 0; ++} ++ ++ ++ ++static int yaffs_do_sync_fs(struct super_block *sb, int request_checkpoint) ++{ ++ ++ struct yaffs_dev *dev = yaffs_super_to_dev(sb); ++ unsigned int oneshot_checkpoint = (yaffs_auto_checkpoint & 4); ++ unsigned gc_urgent = yaffs_bg_gc_urgency(dev); ++ int do_checkpoint; ++ int dirty = yaffs_check_super_dirty(dev); ++ ++ yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND, ++ "yaffs_do_sync_fs: gc-urgency %d %s %s%s", ++ gc_urgent, ++ dirty ? "dirty" : "clean", ++ request_checkpoint ? "checkpoint requested" : "no checkpoint", ++ oneshot_checkpoint ? " one-shot" : ""); ++ ++ yaffs_gross_lock(dev); ++ do_checkpoint = ((request_checkpoint && !gc_urgent) || ++ oneshot_checkpoint) && !dev->is_checkpointed; ++ ++ if (dirty || do_checkpoint) { ++ yaffs_flush_super(sb, !dev->is_checkpointed && do_checkpoint); ++ yaffs_clear_super_dirty(dev); ++ if (oneshot_checkpoint) ++ yaffs_auto_checkpoint &= ~4; ++ } ++ yaffs_gross_unlock(dev); ++ ++ return 0; ++} ++ ++ ++#ifdef YAFFS_HAS_WRITE_SUPER ++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17)) ++static void yaffs_write_super(struct super_block *sb) ++#else ++static int yaffs_write_super(struct super_block *sb) ++#endif ++{ ++ unsigned request_checkpoint = (yaffs_auto_checkpoint >= 2); ++ ++ yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND, ++ "yaffs_write_super %s", ++ request_checkpoint ? " checkpt" : ""); ++ ++ yaffs_do_sync_fs(sb, request_checkpoint); ++ ++#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18)) ++ return 0; ++#endif ++} ++#endif ++ ++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17)) ++static int yaffs_sync_fs(struct super_block *sb, int wait) ++#else ++static int yaffs_sync_fs(struct super_block *sb) ++#endif ++{ ++ unsigned request_checkpoint = (yaffs_auto_checkpoint >= 1); ++ ++ yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, ++ "yaffs_sync_fs%s", request_checkpoint ? " checkpt" : ""); ++ ++ yaffs_do_sync_fs(sb, request_checkpoint); ++ ++ return 0; ++} ++ ++ ++ ++static const struct super_operations yaffs_super_ops = { ++ .statfs = yaffs_statfs, ++ ++#ifndef YAFFS_USE_OWN_IGET ++ .read_inode = yaffs_read_inode, ++#endif ++#ifdef YAFFS_HAS_PUT_INODE ++ .put_inode = yaffs_put_inode, ++#endif ++ .put_super = yaffs_put_super, ++#ifdef YAFFS_HAS_EVICT_INODE ++ .evict_inode = yaffs_evict_inode, ++#else ++ .delete_inode = yaffs_delete_inode, ++ .clear_inode = yaffs_clear_inode, ++#endif ++ .sync_fs = yaffs_sync_fs, ++#ifdef YAFFS_HAS_WRITE_SUPER ++ .write_super = yaffs_write_super, ++#endif ++}; ++ ++struct yaffs_options { ++ int inband_tags; ++ int skip_checkpoint_read; ++ int skip_checkpoint_write; ++ int no_cache; ++ int tags_ecc_on; ++ int tags_ecc_overridden; ++ int lazy_loading_enabled; ++ int lazy_loading_overridden; ++ int empty_lost_and_found; ++ int empty_lost_and_found_overridden; ++ int disable_summary; ++}; ++ ++#define MAX_OPT_LEN 30 ++static int yaffs_parse_options(struct yaffs_options *options, ++ const char *options_str) ++{ ++ char cur_opt[MAX_OPT_LEN + 1]; ++ int p; ++ int error = 0; ++ ++ /* Parse through the options which is a comma seperated list */ ++ ++ while (options_str && *options_str && !error) { ++ memset(cur_opt, 0, MAX_OPT_LEN + 1); ++ p = 0; ++ ++ while (*options_str == ',') ++ options_str++; ++ ++ while (*options_str && *options_str != ',') { ++ if (p < MAX_OPT_LEN) { ++ cur_opt[p] = *options_str; ++ p++; ++ } ++ options_str++; ++ } ++ ++ if (!strcmp(cur_opt, "inband-tags")) { ++ options->inband_tags = 1; ++ } else if (!strcmp(cur_opt, "tags-ecc-off")) { ++ options->tags_ecc_on = 0; ++ options->tags_ecc_overridden = 1; ++ } else if (!strcmp(cur_opt, "tags-ecc-on")) { ++ options->tags_ecc_on = 1; ++ options->tags_ecc_overridden = 1; ++ } else if (!strcmp(cur_opt, "lazy-loading-off")) { ++ options->lazy_loading_enabled = 0; ++ options->lazy_loading_overridden = 1; ++ } else if (!strcmp(cur_opt, "lazy-loading-on")) { ++ options->lazy_loading_enabled = 1; ++ options->lazy_loading_overridden = 1; ++ } else if (!strcmp(cur_opt, "disable-summary")) { ++ options->disable_summary = 1; ++ } else if (!strcmp(cur_opt, "empty-lost-and-found-off")) { ++ options->empty_lost_and_found = 0; ++ options->empty_lost_and_found_overridden = 1; ++ } else if (!strcmp(cur_opt, "empty-lost-and-found-on")) { ++ options->empty_lost_and_found = 1; ++ options->empty_lost_and_found_overridden = 1; ++ } else if (!strcmp(cur_opt, "no-cache")) { ++ options->no_cache = 1; ++ } else if (!strcmp(cur_opt, "no-checkpoint-read")) { ++ options->skip_checkpoint_read = 1; ++ } else if (!strcmp(cur_opt, "no-checkpoint-write")) { ++ options->skip_checkpoint_write = 1; ++ } else if (!strcmp(cur_opt, "no-checkpoint")) { ++ options->skip_checkpoint_read = 1; ++ options->skip_checkpoint_write = 1; ++ } else { ++ printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n", ++ cur_opt); ++ error = 1; ++ } ++ } ++ ++ return error; ++} ++ ++ ++static struct dentry *yaffs_make_root(struct inode *inode) ++{ ++#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0)) ++ struct dentry *root = d_alloc_root(inode); ++ ++ if (!root) ++ iput(inode); ++ ++ return root; ++#else ++ return d_make_root(inode); ++#endif ++} ++ ++ ++ ++ ++static struct super_block *yaffs_internal_read_super(int yaffs_version, ++ struct super_block *sb, ++ void *data, int silent) ++{ ++ int n_blocks; ++ struct inode *inode = NULL; ++ struct dentry *root; ++ struct yaffs_dev *dev = 0; ++ char devname_buf[BDEVNAME_SIZE + 1]; ++ struct mtd_info *mtd; ++ int err; ++ char *data_str = (char *)data; ++ struct yaffs_linux_context *context = NULL; ++ struct yaffs_param *param; ++ ++ int read_only = 0; ++ int inband_tags = 0; ++ ++ struct yaffs_options options; ++ ++ unsigned mount_id; ++ int found; ++ struct yaffs_linux_context *context_iterator; ++ struct list_head *l; ++ ++ if (!sb) { ++ printk(KERN_INFO "yaffs: sb is NULL\n"); ++ return NULL; ++ } ++ ++ sb->s_magic = YAFFS_MAGIC; ++ sb->s_op = &yaffs_super_ops; ++ sb->s_flags |= MS_NOATIME; ++ ++ read_only = ((sb->s_flags & MS_RDONLY) != 0); ++ ++#ifdef YAFFS_COMPILE_EXPORTFS ++ sb->s_export_op = &yaffs_export_ops; ++#endif ++ ++ if (!sb->s_dev) ++ printk(KERN_INFO "yaffs: sb->s_dev is NULL\n"); ++ else if (!yaffs_devname(sb, devname_buf)) ++ printk(KERN_INFO "yaffs: devname is NULL\n"); ++ else ++ printk(KERN_INFO "yaffs: dev is %d name is \"%s\" %s\n", ++ sb->s_dev, ++ yaffs_devname(sb, devname_buf), read_only ? "ro" : "rw"); ++ ++ if (!data_str) ++ data_str = ""; ++ ++ printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str); ++ ++ memset(&options, 0, sizeof(options)); ++ ++ if (yaffs_parse_options(&options, data_str)) { ++ /* Option parsing failed */ ++ return NULL; ++ } ++ ++ sb->s_blocksize = PAGE_CACHE_SIZE; ++ sb->s_blocksize_bits = PAGE_CACHE_SHIFT; ++ ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_read_super: Using yaffs%d", yaffs_version); ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_read_super: block size %d", (int)(sb->s_blocksize)); ++ ++ yaffs_trace(YAFFS_TRACE_ALWAYS, ++ "yaffs: Attempting MTD mount of %u.%u,\"%s\"", ++ MAJOR(sb->s_dev), MINOR(sb->s_dev), ++ yaffs_devname(sb, devname_buf)); ++ ++ /* Get the device */ ++ mtd = get_mtd_device(NULL, MINOR(sb->s_dev)); ++ if (IS_ERR(mtd)) { ++ yaffs_trace(YAFFS_TRACE_ALWAYS, ++ "yaffs: MTD device %u either not valid or unavailable", ++ MINOR(sb->s_dev)); ++ return NULL; ++ } ++ ++ if (yaffs_auto_select && yaffs_version == 1 && WRITE_SIZE(mtd) >= 2048) { ++ yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs2"); ++ yaffs_version = 2; ++ } ++ ++ /* Added NCB 26/5/2006 for completeness */ ++ if (yaffs_version == 2 && !options.inband_tags ++ && WRITE_SIZE(mtd) == 512) { ++ yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs1"); ++ yaffs_version = 1; ++ } ++ ++ if (mtd->oobavail < sizeof(struct yaffs_packed_tags2) || ++ options.inband_tags) ++ inband_tags = 1; ++ ++ if(yaffs_verify_mtd(mtd, yaffs_version, inband_tags) < 0) ++ return NULL; ++ ++ /* OK, so if we got here, we have an MTD that's NAND and looks ++ * like it has the right capabilities ++ * Set the struct yaffs_dev up for mtd ++ */ ++ ++ if (!read_only && !(mtd->flags & MTD_WRITEABLE)) { ++ read_only = 1; ++ printk(KERN_INFO ++ "yaffs: mtd is read only, setting superblock read only\n" ++ ); ++ sb->s_flags |= MS_RDONLY; ++ } ++ ++ dev = kmalloc(sizeof(struct yaffs_dev), GFP_KERNEL); ++ context = kmalloc(sizeof(struct yaffs_linux_context), GFP_KERNEL); ++ ++ if (!dev || !context) { ++ kfree(dev); ++ kfree(context); ++ dev = NULL; ++ context = NULL; ++ ++ /* Deep shit could not allocate device structure */ ++ yaffs_trace(YAFFS_TRACE_ALWAYS, ++ "yaffs_read_super: Failed trying to allocate struct yaffs_dev." ++ ); ++ return NULL; ++ } ++ memset(dev, 0, sizeof(struct yaffs_dev)); ++ param = &(dev->param); ++ ++ memset(context, 0, sizeof(struct yaffs_linux_context)); ++ dev->os_context = context; ++ INIT_LIST_HEAD(&(context->context_list)); ++ context->dev = dev; ++ context->super = sb; ++ ++ dev->read_only = read_only; ++ ++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) ++ sb->s_fs_info = dev; ++#else ++ sb->u.generic_sbp = dev; ++#endif ++ ++ ++ dev->driver_context = mtd; ++ param->name = mtd->name; ++ ++ /* Set up the memory size parameters.... */ ++ ++ ++ param->n_reserved_blocks = 5; ++ param->n_caches = (options.no_cache) ? 0 : 10; ++ param->inband_tags = inband_tags; ++ ++ param->enable_xattr = 1; ++ if (options.lazy_loading_overridden) ++ param->disable_lazy_load = !options.lazy_loading_enabled; ++ ++ param->defered_dir_update = 1; ++ ++ if (options.tags_ecc_overridden) ++ param->no_tags_ecc = !options.tags_ecc_on; ++ ++ param->empty_lost_n_found = 1; ++ param->refresh_period = 500; ++ param->disable_summary = options.disable_summary; ++ ++ ++#ifdef CONFIG_YAFFS_DISABLE_BAD_BLOCK_MARKING ++ param->disable_bad_block_marking = 1; ++#endif ++ if (options.empty_lost_and_found_overridden) ++ param->empty_lost_n_found = options.empty_lost_and_found; ++ ++ /* ... and the functions. */ ++ if (yaffs_version == 2) { ++ param->is_yaffs2 = 1; ++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17)) ++ param->total_bytes_per_chunk = mtd->writesize; ++ param->chunks_per_block = mtd->erasesize / mtd->writesize; ++#else ++ param->total_bytes_per_chunk = mtd->oobblock; ++ param->chunks_per_block = mtd->erasesize / mtd->oobblock; ++#endif ++ n_blocks = YCALCBLOCKS(mtd->size, mtd->erasesize); ++ ++ param->start_block = 0; ++ param->end_block = n_blocks - 1; ++ } else { ++ param->is_yaffs2 = 0; ++ n_blocks = YCALCBLOCKS(mtd->size, ++ YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK); ++ ++ param->chunks_per_block = YAFFS_CHUNKS_PER_BLOCK; ++ param->total_bytes_per_chunk = YAFFS_BYTES_PER_CHUNK; ++ } ++ ++ param->start_block = 0; ++ param->end_block = n_blocks - 1; ++ ++ yaffs_mtd_drv_install(dev); ++ ++ param->sb_dirty_fn = yaffs_set_super_dirty; ++ param->gc_control_fn = yaffs_gc_control_callback; ++ ++ yaffs_dev_to_lc(dev)->super = sb; ++ ++ param->use_nand_ecc = 1; ++ ++ param->skip_checkpt_rd = options.skip_checkpoint_read; ++ param->skip_checkpt_wr = options.skip_checkpoint_write; ++ ++ mutex_lock(&yaffs_context_lock); ++ /* Get a mount id */ ++ found = 0; ++ for (mount_id = 0; !found; mount_id++) { ++ found = 1; ++ list_for_each(l, &yaffs_context_list) { ++ context_iterator = ++ list_entry(l, struct yaffs_linux_context, ++ context_list); ++ if (context_iterator->mount_id == mount_id) ++ found = 0; ++ } ++ } ++ context->mount_id = mount_id; ++ ++ list_add_tail(&(yaffs_dev_to_lc(dev)->context_list), ++ &yaffs_context_list); ++ mutex_unlock(&yaffs_context_lock); ++ ++ /* Directory search handling... */ ++ INIT_LIST_HEAD(&(yaffs_dev_to_lc(dev)->search_contexts)); ++ param->remove_obj_fn = yaffs_remove_obj_callback; ++ ++ mutex_init(&(yaffs_dev_to_lc(dev)->gross_lock)); ++ ++ yaffs_gross_lock(dev); ++ ++ err = yaffs_guts_initialise(dev); ++ ++ yaffs_trace(YAFFS_TRACE_OS, ++ "yaffs_read_super: guts initialised %s", ++ (err == YAFFS_OK) ? "OK" : "FAILED"); ++ ++ if (err == YAFFS_OK) ++ yaffs_bg_start(dev); ++ ++ if (!context->bg_thread) ++ param->defered_dir_update = 0; ++ ++ sb->s_maxbytes = yaffs_max_file_size(dev); ++ ++ /* Release lock before yaffs_get_inode() */ ++ yaffs_gross_unlock(dev); ++ ++ /* Create root inode */ ++ if (err == YAFFS_OK) ++ inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0, yaffs_root(dev)); ++ ++ if (!inode) ++ return NULL; ++ ++ inode->i_op = &yaffs_dir_inode_operations; ++ inode->i_fop = &yaffs_dir_operations; ++ ++ yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: got root inode"); ++ ++ root = yaffs_make_root(inode); ++ ++ if (!root) ++ return NULL; ++ ++ sb->s_root = root; ++ if(!dev->is_checkpointed) ++ yaffs_set_super_dirty(dev); ++ ++ yaffs_trace(YAFFS_TRACE_ALWAYS, ++ "yaffs_read_super: is_checkpointed %d", ++ dev->is_checkpointed); ++ ++ yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: done"); ++ return sb; ++} ++ ++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) ++static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data, ++ int silent) ++{ ++ return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL; ++} ++ ++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39)) ++static struct dentry *yaffs_mount(struct file_system_type *fs_type, int flags, ++ const char *dev_name, void *data) ++{ ++ return mount_bdev(fs_type, flags, dev_name, data, yaffs_internal_read_super_mtd); ++} ++#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17)) ++static int yaffs_read_super(struct file_system_type *fs, ++ int flags, const char *dev_name, ++ void *data, struct vfsmount *mnt) ++{ ++ ++ return get_sb_bdev(fs, flags, dev_name, data, ++ yaffs_internal_read_super_mtd, mnt); ++} ++#else ++static struct super_block *yaffs_read_super(struct file_system_type *fs, ++ int flags, const char *dev_name, ++ void *data) ++{ ++ ++ return get_sb_bdev(fs, flags, dev_name, data, ++ yaffs_internal_read_super_mtd); ++} ++#endif ++ ++static struct file_system_type yaffs_fs_type = { ++ .owner = THIS_MODULE, ++ .name = "yaffs", ++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39)) ++ .mount = yaffs_mount, ++#else ++ .get_sb = yaffs_read_super, ++#endif ++ .kill_sb = kill_block_super, ++ .fs_flags = FS_REQUIRES_DEV, ++}; ++#else ++static struct super_block *yaffs_read_super(struct super_block *sb, void *data, ++ int silent) ++{ ++ return yaffs_internal_read_super(1, sb, data, silent); ++} ++ ++static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super, ++ FS_REQUIRES_DEV); ++#endif ++ ++ ++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) ++static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data, ++ int silent) ++{ ++ return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL; ++} ++ ++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39)) ++static struct dentry *yaffs2_mount(struct file_system_type *fs_type, int flags, ++ const char *dev_name, void *data) ++{ ++ return mount_bdev(fs_type, flags, dev_name, data, yaffs2_internal_read_super_mtd); ++} ++#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17)) ++static int yaffs2_read_super(struct file_system_type *fs, ++ int flags, const char *dev_name, void *data, ++ struct vfsmount *mnt) ++{ ++ return get_sb_bdev(fs, flags, dev_name, data, ++ yaffs2_internal_read_super_mtd, mnt); ++} ++#else ++static struct super_block *yaffs2_read_super(struct file_system_type *fs, ++ int flags, const char *dev_name, ++ void *data) ++{ ++ ++ return get_sb_bdev(fs, flags, dev_name, data, ++ yaffs2_internal_read_super_mtd); ++} ++#endif ++ ++static struct file_system_type yaffs2_fs_type = { ++ .owner = THIS_MODULE, ++ .name = "yaffs2", ++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39)) ++ .mount = yaffs2_mount, ++#else ++ .get_sb = yaffs2_read_super, ++#endif ++ .kill_sb = kill_block_super, ++ .fs_flags = FS_REQUIRES_DEV, ++}; ++#else ++static struct super_block *yaffs2_read_super(struct super_block *sb, ++ void *data, int silent) ++{ ++ return yaffs_internal_read_super(2, sb, data, silent); ++} ++ ++static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super, ++ FS_REQUIRES_DEV); ++#endif ++ ++ ++#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 9, 0)) ++static struct proc_dir_entry *my_proc_entry; ++ ++static char *yaffs_dump_dev_part0(char *buf, struct yaffs_dev *dev) ++{ ++ struct yaffs_param *param = &dev->param; ++ int bs[10]; ++ ++ yaffs_count_blocks_by_state(dev,bs); ++ ++ buf += sprintf(buf, "start_block.......... %d\n", param->start_block); ++ buf += sprintf(buf, "end_block............ %d\n", param->end_block); ++ buf += sprintf(buf, "total_bytes_per_chunk %d\n", ++ param->total_bytes_per_chunk); ++ buf += sprintf(buf, "use_nand_ecc......... %d\n", param->use_nand_ecc); ++ buf += sprintf(buf, "no_tags_ecc.......... %d\n", param->no_tags_ecc); ++ buf += sprintf(buf, "is_yaffs2............ %d\n", param->is_yaffs2); ++ buf += sprintf(buf, "inband_tags.......... %d\n", param->inband_tags); ++ buf += sprintf(buf, "empty_lost_n_found... %d\n", ++ param->empty_lost_n_found); ++ buf += sprintf(buf, "disable_lazy_load.... %d\n", ++ param->disable_lazy_load); ++ buf += sprintf(buf, "disable_bad_block_mrk %d\n", ++ param->disable_bad_block_marking); ++ buf += sprintf(buf, "refresh_period....... %d\n", ++ param->refresh_period); ++ buf += sprintf(buf, "n_caches............. %d\n", param->n_caches); ++ buf += sprintf(buf, "n_reserved_blocks.... %d\n", ++ param->n_reserved_blocks); ++ buf += sprintf(buf, "always_check_erased.. %d\n", ++ param->always_check_erased); ++ buf += sprintf(buf, "\n"); ++ buf += sprintf(buf, "block count by state\n"); ++ buf += sprintf(buf, "0:%d 1:%d 2:%d 3:%d 4:%d\n", ++ bs[0], bs[1], bs[2], bs[3], bs[4]); ++ buf += sprintf(buf, "5:%d 6:%d 7:%d 8:%d 9:%d\n", ++ bs[5], bs[6], bs[7], bs[8], bs[9]); ++ ++ return buf; ++} ++ ++static char *yaffs_dump_dev_part1(char *buf, struct yaffs_dev *dev) ++{ ++ buf += sprintf(buf, "max file size....... %lld\n", ++ (long long) yaffs_max_file_size(dev)); ++ buf += sprintf(buf, "data_bytes_per_chunk. %d\n", ++ dev->data_bytes_per_chunk); ++ buf += sprintf(buf, "chunk_grp_bits....... %d\n", dev->chunk_grp_bits); ++ buf += sprintf(buf, "chunk_grp_size....... %d\n", dev->chunk_grp_size); ++ buf += sprintf(buf, "n_erased_blocks...... %d\n", dev->n_erased_blocks); ++ buf += sprintf(buf, "blocks_in_checkpt.... %d\n", ++ dev->blocks_in_checkpt); ++ buf += sprintf(buf, "\n"); ++ buf += sprintf(buf, "n_tnodes............. %d\n", dev->n_tnodes); ++ buf += sprintf(buf, "n_obj................ %d\n", dev->n_obj); ++ buf += sprintf(buf, "n_free_chunks........ %d\n", dev->n_free_chunks); ++ buf += sprintf(buf, "\n"); ++ buf += sprintf(buf, "n_page_writes........ %u\n", dev->n_page_writes); ++ buf += sprintf(buf, "n_page_reads......... %u\n", dev->n_page_reads); ++ buf += sprintf(buf, "n_erasures........... %u\n", dev->n_erasures); ++ buf += sprintf(buf, "n_gc_copies.......... %u\n", dev->n_gc_copies); ++ buf += sprintf(buf, "all_gcs.............. %u\n", dev->all_gcs); ++ buf += sprintf(buf, "passive_gc_count..... %u\n", ++ dev->passive_gc_count); ++ buf += sprintf(buf, "oldest_dirty_gc_count %u\n", ++ dev->oldest_dirty_gc_count); ++ buf += sprintf(buf, "n_gc_blocks.......... %u\n", dev->n_gc_blocks); ++ buf += sprintf(buf, "bg_gcs............... %u\n", dev->bg_gcs); ++ buf += sprintf(buf, "n_retried_writes..... %u\n", ++ dev->n_retried_writes); ++ buf += sprintf(buf, "n_retired_blocks..... %u\n", ++ dev->n_retired_blocks); ++ buf += sprintf(buf, "n_ecc_fixed.......... %u\n", dev->n_ecc_fixed); ++ buf += sprintf(buf, "n_ecc_unfixed........ %u\n", dev->n_ecc_unfixed); ++ buf += sprintf(buf, "n_tags_ecc_fixed..... %u\n", ++ dev->n_tags_ecc_fixed); ++ buf += sprintf(buf, "n_tags_ecc_unfixed... %u\n", ++ dev->n_tags_ecc_unfixed); ++ buf += sprintf(buf, "cache_hits........... %u\n", dev->cache_hits); ++ buf += sprintf(buf, "n_deleted_files...... %u\n", dev->n_deleted_files); ++ buf += sprintf(buf, "n_unlinked_files..... %u\n", ++ dev->n_unlinked_files); ++ buf += sprintf(buf, "refresh_count........ %u\n", dev->refresh_count); ++ buf += sprintf(buf, "n_bg_deletions....... %u\n", dev->n_bg_deletions); ++ buf += sprintf(buf, "tags_used............ %u\n", dev->tags_used); ++ buf += sprintf(buf, "summary_used......... %u\n", dev->summary_used); ++ ++ return buf; ++} ++ ++static int yaffs_proc_read(char *page, ++ char **start, ++ off_t offset, int count, int *eof, void *data) ++{ ++ struct list_head *item; ++ char *buf = page; ++ int step = offset; ++ int n = 0; ++ ++ /* Get proc_file_read() to step 'offset' by one on each sucessive call. ++ * We use 'offset' (*ppos) to indicate where we are in dev_list. ++ * This also assumes the user has posted a read buffer large ++ * enough to hold the complete output; but that's life in /proc. ++ */ ++ ++ *(int *)start = 1; ++ ++ /* Print header first */ ++ if (step == 0) ++ buf += ++ sprintf(buf, ++ "Multi-version YAFFS built:" __DATE__ " " __TIME__ ++ "\n"); ++ else if (step == 1) ++ buf += sprintf(buf, "\n"); ++ else { ++ step -= 2; ++ ++ mutex_lock(&yaffs_context_lock); ++ ++ /* Locate and print the Nth entry. Order N-squared but N is small. */ ++ list_for_each(item, &yaffs_context_list) { ++ struct yaffs_linux_context *dc = ++ list_entry(item, struct yaffs_linux_context, ++ context_list); ++ struct yaffs_dev *dev = dc->dev; ++ ++ if (n < (step & ~1)) { ++ n += 2; ++ continue; ++ } ++ if ((step & 1) == 0) { ++ buf += ++ sprintf(buf, "\nDevice %d \"%s\"\n", n, ++ dev->param.name); ++ buf = yaffs_dump_dev_part0(buf, dev); ++ } else { ++ buf = yaffs_dump_dev_part1(buf, dev); ++ } ++ ++ break; ++ } ++ mutex_unlock(&yaffs_context_lock); ++ } ++ ++ return buf - page < count ? buf - page : count; ++} ++ ++/** ++ * Set the verbosity of the warnings and error messages. ++ * ++ * Note that the names can only be a..z or _ with the current code. ++ */ ++ ++static struct { ++ char *mask_name; ++ unsigned mask_bitfield; ++} mask_flags[] = { ++ {"allocate", YAFFS_TRACE_ALLOCATE}, ++ {"always", YAFFS_TRACE_ALWAYS}, ++ {"background", YAFFS_TRACE_BACKGROUND}, ++ {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS}, ++ {"buffers", YAFFS_TRACE_BUFFERS}, ++ {"bug", YAFFS_TRACE_BUG}, ++ {"checkpt", YAFFS_TRACE_CHECKPOINT}, ++ {"deletion", YAFFS_TRACE_DELETION}, ++ {"erase", YAFFS_TRACE_ERASE}, ++ {"error", YAFFS_TRACE_ERROR}, ++ {"gc_detail", YAFFS_TRACE_GC_DETAIL}, ++ {"gc", YAFFS_TRACE_GC}, ++ {"lock", YAFFS_TRACE_LOCK}, ++ {"mtd", YAFFS_TRACE_MTD}, ++ {"nandaccess", YAFFS_TRACE_NANDACCESS}, ++ {"os", YAFFS_TRACE_OS}, ++ {"scan_debug", YAFFS_TRACE_SCAN_DEBUG}, ++ {"scan", YAFFS_TRACE_SCAN}, ++ {"mount", YAFFS_TRACE_MOUNT}, ++ {"tracing", YAFFS_TRACE_TRACING}, ++ {"sync", YAFFS_TRACE_SYNC}, ++ {"write", YAFFS_TRACE_WRITE}, ++ {"verify", YAFFS_TRACE_VERIFY}, ++ {"verify_nand", YAFFS_TRACE_VERIFY_NAND}, ++ {"verify_full", YAFFS_TRACE_VERIFY_FULL}, ++ {"verify_all", YAFFS_TRACE_VERIFY_ALL}, ++ {"all", 0xffffffff}, ++ {"none", 0}, ++ {NULL, 0}, ++}; ++ ++#define MAX_MASK_NAME_LENGTH 40 ++static int yaffs_proc_write_trace_options(struct file *file, const char *buf, ++ unsigned long count, void *data) ++{ ++ unsigned rg = 0, mask_bitfield; ++ char *end; ++ char *mask_name; ++ const char *x; ++ char substring[MAX_MASK_NAME_LENGTH + 1]; ++ int i; ++ int done = 0; ++ int add, len = 0; ++ int pos = 0; ++ ++ rg = yaffs_trace_mask; ++ ++ while (!done && (pos < count)) { ++ done = 1; ++ while ((pos < count) && isspace(buf[pos])) ++ pos++; ++ ++ switch (buf[pos]) { ++ case '+': ++ case '-': ++ case '=': ++ add = buf[pos]; ++ pos++; ++ break; ++ ++ default: ++ add = ' '; ++ break; ++ } ++ mask_name = NULL; ++ ++ mask_bitfield = simple_strtoul(buf + pos, &end, 0); ++ ++ if (end > buf + pos) { ++ mask_name = "numeral"; ++ len = end - (buf + pos); ++ pos += len; ++ done = 0; ++ } else { ++ for (x = buf + pos, i = 0; ++ (*x == '_' || (*x >= 'a' && *x <= 'z')) && ++ i < MAX_MASK_NAME_LENGTH; x++, i++, pos++) ++ substring[i] = *x; ++ substring[i] = '\0'; ++ ++ for (i = 0; mask_flags[i].mask_name != NULL; i++) { ++ if (strcmp(substring, mask_flags[i].mask_name) ++ == 0) { ++ mask_name = mask_flags[i].mask_name; ++ mask_bitfield = ++ mask_flags[i].mask_bitfield; ++ done = 0; ++ break; ++ } ++ } ++ } ++ ++ if (mask_name != NULL) { ++ done = 0; ++ switch (add) { ++ case '-': ++ rg &= ~mask_bitfield; ++ break; ++ case '+': ++ rg |= mask_bitfield; ++ break; ++ case '=': ++ rg = mask_bitfield; ++ break; ++ default: ++ rg |= mask_bitfield; ++ break; ++ } ++ } ++ } ++ ++ yaffs_trace_mask = rg | YAFFS_TRACE_ALWAYS; ++ ++ printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_trace_mask); ++ ++ if (rg & YAFFS_TRACE_ALWAYS) { ++ for (i = 0; mask_flags[i].mask_name != NULL; i++) { ++ char flag; ++ flag = ((rg & mask_flags[i].mask_bitfield) == ++ mask_flags[i].mask_bitfield) ? '+' : '-'; ++ printk(KERN_DEBUG "%c%s\n", flag, ++ mask_flags[i].mask_name); ++ } ++ } ++ ++ return count; ++} ++ ++/* Debug strings are of the form: ++ * .bnnn print info on block n ++ * .cobjn,chunkn print nand chunk id for objn:chunkn ++ */ ++ ++static int yaffs_proc_debug_write(struct file *file, const char *buf, ++ unsigned long count, void *data) ++{ ++ ++ char str[100]; ++ char *p0; ++ char *p1; ++ long p1_val; ++ long p0_val; ++ char cmd; ++ struct list_head *item; ++ ++ memset(str, 0, sizeof(str)); ++ memcpy(str, buf, min(count, sizeof(str) -1)); ++ ++ cmd = str[1]; ++ ++ p0 = str + 2; ++ ++ p1 = p0; ++ ++ while (*p1 && *p1 != ',') { ++ p1++; ++ } ++ *p1 = '\0'; ++ p1++; ++ ++ p0_val = simple_strtol(p0, NULL, 0); ++ p1_val = simple_strtol(p1, NULL, 0); ++ ++ ++ mutex_lock(&yaffs_context_lock); ++ ++ /* Locate and print the Nth entry. Order N-squared but N is small. */ ++ list_for_each(item, &yaffs_context_list) { ++ struct yaffs_linux_context *dc = ++ list_entry(item, struct yaffs_linux_context, ++ context_list); ++ struct yaffs_dev *dev = dc->dev; ++ ++ if (cmd == 'b') { ++ struct yaffs_block_info *bi; ++ ++ bi = yaffs_get_block_info(dev,p0_val); ++ ++ if(bi) { ++ printk("Block %d: state %d, retire %d, use %d, seq %d\n", ++ (int)p0_val, bi->block_state, ++ bi->needs_retiring, bi->pages_in_use, ++ bi->seq_number); ++ } ++ } else if (cmd == 'c') { ++ struct yaffs_obj *obj; ++ int nand_chunk; ++ ++ obj = yaffs_find_by_number(dev, p0_val); ++ if (!obj) ++ printk("No obj %d\n", (int)p0_val); ++ else { ++ if(p1_val == 0) ++ nand_chunk = obj->hdr_chunk; ++ else ++ nand_chunk = ++ yaffs_find_chunk_in_file(obj, ++ p1_val, NULL); ++ printk("Nand chunk for %d:%d is %d\n", ++ (int)p0_val, (int)p1_val, nand_chunk); ++ } ++ } ++ } ++ ++ mutex_unlock(&yaffs_context_lock); ++ ++ return count; ++} ++ ++static int yaffs_proc_write(struct file *file, const char *buf, ++ unsigned long count, void *data) ++{ ++ if (buf[0] == '.') ++ return yaffs_proc_debug_write(file, buf, count, data); ++ return yaffs_proc_write_trace_options(file, buf, count, data); ++} ++#endif /* (LINUX_VERSION_CODE < KERNEL_VERSION(3, 9, 0)) */ ++ ++/* Stuff to handle installation of file systems */ ++struct file_system_to_install { ++ struct file_system_type *fst; ++ int installed; ++}; ++ ++static struct file_system_to_install fs_to_install[] = { ++ {&yaffs_fs_type, 0}, ++ {&yaffs2_fs_type, 0}, ++ {NULL, 0} ++}; ++ ++static int __init init_yaffs_fs(void) ++{ ++ int error = 0; ++ struct file_system_to_install *fsinst; ++ ++ yaffs_trace(YAFFS_TRACE_ALWAYS, ++ "yaffs built " __DATE__ " " __TIME__ " Installing."); ++ ++ mutex_init(&yaffs_context_lock); ++ ++#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 9, 0)) ++ /* Install the proc_fs entries */ ++ my_proc_entry = create_proc_entry("yaffs", ++ S_IRUGO | S_IFREG, YPROC_ROOT); ++ ++ if (my_proc_entry) { ++ my_proc_entry->write_proc = yaffs_proc_write; ++ my_proc_entry->read_proc = yaffs_proc_read; ++ my_proc_entry->data = NULL; ++ } else { ++ return -ENOMEM; ++ } ++#endif ++ ++ /* Now add the file system entries */ ++ ++ fsinst = fs_to_install; ++ ++ while (fsinst->fst && !error) { ++ error = register_filesystem(fsinst->fst); ++ if (!error) ++ fsinst->installed = 1; ++ fsinst++; ++ } ++ ++ /* Any errors? uninstall */ ++ if (error) { ++ fsinst = fs_to_install; ++ ++ while (fsinst->fst) { ++ if (fsinst->installed) { ++ unregister_filesystem(fsinst->fst); ++ fsinst->installed = 0; ++ } ++ fsinst++; ++ } ++ } ++ ++ return error; ++} ++ ++static void __exit exit_yaffs_fs(void) ++{ ++ ++ struct file_system_to_install *fsinst; ++ ++ yaffs_trace(YAFFS_TRACE_ALWAYS, ++ "yaffs built " __DATE__ " " __TIME__ " removing."); ++ ++#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 9, 0)) ++ remove_proc_entry("yaffs", YPROC_ROOT); ++#endif ++ ++ fsinst = fs_to_install; ++ ++ while (fsinst->fst) { ++ if (fsinst->installed) { ++ unregister_filesystem(fsinst->fst); ++ fsinst->installed = 0; ++ } ++ fsinst++; ++ } ++} ++ ++module_init(init_yaffs_fs) ++ module_exit(exit_yaffs_fs) ++ ++ MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system"); ++MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2011"); ++MODULE_LICENSE("GPL"); +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_yaffs1.c linux-3.15-rc5/fs/yaffs2/yaffs_yaffs1.c +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_yaffs1.c 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_yaffs1.c 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,422 @@ ++/* ++ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU General Public License version 2 as ++ * published by the Free Software Foundation. ++ */ ++ ++#include "yaffs_yaffs1.h" ++#include "yportenv.h" ++#include "yaffs_trace.h" ++#include "yaffs_bitmap.h" ++#include "yaffs_getblockinfo.h" ++#include "yaffs_nand.h" ++#include "yaffs_attribs.h" ++ ++int yaffs1_scan(struct yaffs_dev *dev) ++{ ++ struct yaffs_ext_tags tags; ++ int blk; ++ int result; ++ int chunk; ++ int c; ++ int deleted; ++ enum yaffs_block_state state; ++ LIST_HEAD(hard_list); ++ struct yaffs_block_info *bi; ++ u32 seq_number; ++ struct yaffs_obj_hdr *oh; ++ struct yaffs_obj *in; ++ struct yaffs_obj *parent; ++ int alloc_failed = 0; ++ struct yaffs_shadow_fixer *shadow_fixers = NULL; ++ u8 *chunk_data; ++ ++ yaffs_trace(YAFFS_TRACE_SCAN, ++ "yaffs1_scan starts intstartblk %d intendblk %d...", ++ dev->internal_start_block, dev->internal_end_block); ++ ++ chunk_data = yaffs_get_temp_buffer(dev); ++ ++ dev->seq_number = YAFFS_LOWEST_SEQUENCE_NUMBER; ++ ++ /* Scan all the blocks to determine their state */ ++ bi = dev->block_info; ++ for (blk = dev->internal_start_block; blk <= dev->internal_end_block; ++ blk++) { ++ yaffs_clear_chunk_bits(dev, blk); ++ bi->pages_in_use = 0; ++ bi->soft_del_pages = 0; ++ ++ yaffs_query_init_block_state(dev, blk, &state, &seq_number); ++ ++ bi->block_state = state; ++ bi->seq_number = seq_number; ++ ++ if (bi->seq_number == YAFFS_SEQUENCE_BAD_BLOCK) ++ bi->block_state = state = YAFFS_BLOCK_STATE_DEAD; ++ ++ yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, ++ "Block scanning block %d state %d seq %d", ++ blk, state, seq_number); ++ ++ if (state == YAFFS_BLOCK_STATE_DEAD) { ++ yaffs_trace(YAFFS_TRACE_BAD_BLOCKS, ++ "block %d is bad", blk); ++ } else if (state == YAFFS_BLOCK_STATE_EMPTY) { ++ yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, "Block empty "); ++ dev->n_erased_blocks++; ++ dev->n_free_chunks += dev->param.chunks_per_block; ++ } ++ bi++; ++ } ++ ++ /* For each block.... */ ++ for (blk = dev->internal_start_block; ++ !alloc_failed && blk <= dev->internal_end_block; blk++) { ++ ++ cond_resched(); ++ ++ bi = yaffs_get_block_info(dev, blk); ++ state = bi->block_state; ++ ++ deleted = 0; ++ ++ /* For each chunk in each block that needs scanning.... */ ++ for (c = 0; ++ !alloc_failed && c < dev->param.chunks_per_block && ++ state == YAFFS_BLOCK_STATE_NEEDS_SCAN; c++) { ++ /* Read the tags and decide what to do */ ++ chunk = blk * dev->param.chunks_per_block + c; ++ ++ result = yaffs_rd_chunk_tags_nand(dev, chunk, NULL, ++ &tags); ++ ++ /* Let's have a good look at this chunk... */ ++ ++ if (tags.ecc_result == YAFFS_ECC_RESULT_UNFIXED || ++ tags.is_deleted) { ++ /* YAFFS1 only... ++ * A deleted chunk ++ */ ++ deleted++; ++ dev->n_free_chunks++; ++ } else if (!tags.chunk_used) { ++ /* An unassigned chunk in the block ++ * This means that either the block is empty or ++ * this is the one being allocated from ++ */ ++ ++ if (c == 0) { ++ /* We're looking at the first chunk in ++ *the block so the block is unused */ ++ state = YAFFS_BLOCK_STATE_EMPTY; ++ dev->n_erased_blocks++; ++ } else { ++ /* this is the block being allocated */ ++ yaffs_trace(YAFFS_TRACE_SCAN, ++ " Allocating from %d %d", ++ blk, c); ++ state = YAFFS_BLOCK_STATE_ALLOCATING; ++ dev->alloc_block = blk; ++ dev->alloc_page = c; ++ dev->alloc_block_finder = blk; ++ ++ } ++ ++ dev->n_free_chunks += ++ (dev->param.chunks_per_block - c); ++ } else if (tags.chunk_id > 0) { ++ /* chunk_id > 0 so it is a data chunk... */ ++ unsigned int endpos; ++ ++ yaffs_set_chunk_bit(dev, blk, c); ++ bi->pages_in_use++; ++ ++ in = yaffs_find_or_create_by_number(dev, ++ tags.obj_id, ++ YAFFS_OBJECT_TYPE_FILE); ++ /* PutChunkIntoFile checks for a clash ++ * (two data chunks with the same chunk_id). ++ */ ++ ++ if (!in) ++ alloc_failed = 1; ++ ++ if (in) { ++ if (!yaffs_put_chunk_in_file ++ (in, tags.chunk_id, chunk, 1)) ++ alloc_failed = 1; ++ } ++ ++ endpos = ++ (tags.chunk_id - 1) * ++ dev->data_bytes_per_chunk + ++ tags.n_bytes; ++ if (in && ++ in->variant_type == ++ YAFFS_OBJECT_TYPE_FILE && ++ in->variant.file_variant.scanned_size < ++ endpos) { ++ in->variant.file_variant.scanned_size = ++ endpos; ++ if (!dev->param.use_header_file_size) { ++ in->variant. ++ file_variant.file_size = ++ in->variant. ++ file_variant.scanned_size; ++ } ++ ++ } ++ } else { ++ /* chunk_id == 0, so it is an ObjectHeader. ++ * Make the object ++ */ ++ yaffs_set_chunk_bit(dev, blk, c); ++ bi->pages_in_use++; ++ ++ result = yaffs_rd_chunk_tags_nand(dev, chunk, ++ chunk_data, ++ NULL); ++ ++ oh = (struct yaffs_obj_hdr *)chunk_data; ++ ++ in = yaffs_find_by_number(dev, tags.obj_id); ++ if (in && in->variant_type != oh->type) { ++ /* This should not happen, but somehow ++ * Wev'e ended up with an obj_id that ++ * has been reused but not yet deleted, ++ * and worse still it has changed type. ++ * Delete the old object. ++ */ ++ ++ yaffs_del_obj(in); ++ in = NULL; ++ } ++ ++ in = yaffs_find_or_create_by_number(dev, ++ tags.obj_id, ++ oh->type); ++ ++ if (!in) ++ alloc_failed = 1; ++ ++ if (in && oh->shadows_obj > 0) { ++ ++ struct yaffs_shadow_fixer *fixer; ++ fixer = ++ kmalloc(sizeof ++ (struct yaffs_shadow_fixer), ++ GFP_NOFS); ++ if (fixer) { ++ fixer->next = shadow_fixers; ++ shadow_fixers = fixer; ++ fixer->obj_id = tags.obj_id; ++ fixer->shadowed_id = ++ oh->shadows_obj; ++ yaffs_trace(YAFFS_TRACE_SCAN, ++ " Shadow fixer: %d shadows %d", ++ fixer->obj_id, ++ fixer->shadowed_id); ++ ++ } ++ ++ } ++ ++ if (in && in->valid) { ++ /* We have already filled this one. ++ * We have a duplicate and need to ++ * resolve it. */ ++ ++ unsigned existing_serial = in->serial; ++ unsigned new_serial = ++ tags.serial_number; ++ ++ if (((existing_serial + 1) & 3) == ++ new_serial) { ++ /* Use new one - destroy the ++ * exisiting one */ ++ yaffs_chunk_del(dev, ++ in->hdr_chunk, ++ 1, __LINE__); ++ in->valid = 0; ++ } else { ++ /* Use existing - destroy ++ * this one. */ ++ yaffs_chunk_del(dev, chunk, 1, ++ __LINE__); ++ } ++ } ++ ++ if (in && !in->valid && ++ (tags.obj_id == YAFFS_OBJECTID_ROOT || ++ tags.obj_id == ++ YAFFS_OBJECTID_LOSTNFOUND)) { ++ /* We only load some info, don't fiddle ++ * with directory structure */ ++ in->valid = 1; ++ in->variant_type = oh->type; ++ ++ in->yst_mode = oh->yst_mode; ++ yaffs_load_attribs(in, oh); ++ in->hdr_chunk = chunk; ++ in->serial = tags.serial_number; ++ ++ } else if (in && !in->valid) { ++ /* we need to load this info */ ++ ++ in->valid = 1; ++ in->variant_type = oh->type; ++ ++ in->yst_mode = oh->yst_mode; ++ yaffs_load_attribs(in, oh); ++ in->hdr_chunk = chunk; ++ in->serial = tags.serial_number; ++ ++ yaffs_set_obj_name_from_oh(in, oh); ++ in->dirty = 0; ++ ++ /* directory stuff... ++ * hook up to parent ++ */ ++ ++ parent = ++ yaffs_find_or_create_by_number ++ (dev, oh->parent_obj_id, ++ YAFFS_OBJECT_TYPE_DIRECTORY); ++ if (!parent) ++ alloc_failed = 1; ++ if (parent && parent->variant_type == ++ YAFFS_OBJECT_TYPE_UNKNOWN) { ++ /* Set up as a directory */ ++ parent->variant_type = ++ YAFFS_OBJECT_TYPE_DIRECTORY; ++ INIT_LIST_HEAD(&parent-> ++ variant.dir_variant. ++ children); ++ } else if (!parent || ++ parent->variant_type != ++ YAFFS_OBJECT_TYPE_DIRECTORY) { ++ /* Hoosterman, a problem.... ++ * We're trying to use a ++ * non-directory as a directory ++ */ ++ ++ yaffs_trace(YAFFS_TRACE_ERROR, ++ "yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found." ++ ); ++ parent = dev->lost_n_found; ++ } ++ ++ yaffs_add_obj_to_dir(parent, in); ++ ++ switch (in->variant_type) { ++ case YAFFS_OBJECT_TYPE_UNKNOWN: ++ /* Todo got a problem */ ++ break; ++ case YAFFS_OBJECT_TYPE_FILE: ++ if (dev->param. ++ use_header_file_size) ++ in->variant. ++ file_variant.file_size ++ = yaffs_oh_to_size(oh); ++ break; ++ case YAFFS_OBJECT_TYPE_HARDLINK: ++ in->variant. ++ hardlink_variant.equiv_id = ++ oh->equiv_id; ++ list_add(&in->hard_links, ++ &hard_list); ++ break; ++ case YAFFS_OBJECT_TYPE_DIRECTORY: ++ /* Do nothing */ ++ break; ++ case YAFFS_OBJECT_TYPE_SPECIAL: ++ /* Do nothing */ ++ break; ++ case YAFFS_OBJECT_TYPE_SYMLINK: ++ in->variant.symlink_variant. ++ alias = ++ yaffs_clone_str(oh->alias); ++ if (!in->variant. ++ symlink_variant.alias) ++ alloc_failed = 1; ++ break; ++ } ++ } ++ } ++ } ++ ++ if (state == YAFFS_BLOCK_STATE_NEEDS_SCAN) { ++ /* If we got this far while scanning, ++ * then the block is fully allocated. */ ++ state = YAFFS_BLOCK_STATE_FULL; ++ } ++ ++ if (state == YAFFS_BLOCK_STATE_ALLOCATING) { ++ /* If the block was partially allocated then ++ * treat it as fully allocated. */ ++ state = YAFFS_BLOCK_STATE_FULL; ++ dev->alloc_block = -1; ++ } ++ ++ bi->block_state = state; ++ ++ /* Now let's see if it was dirty */ ++ if (bi->pages_in_use == 0 && ++ !bi->has_shrink_hdr && ++ bi->block_state == YAFFS_BLOCK_STATE_FULL) ++ yaffs_block_became_dirty(dev, blk); ++ } ++ ++ /* Ok, we've done all the scanning. ++ * Fix up the hard link chains. ++ * We should now have scanned all the objects, now it's time to add ++ * these hardlinks. ++ */ ++ ++ yaffs_link_fixup(dev, &hard_list); ++ ++ /* ++ * Fix up any shadowed objects. ++ * There should not be more than one of these. ++ */ ++ { ++ struct yaffs_shadow_fixer *fixer; ++ struct yaffs_obj *obj; ++ ++ while (shadow_fixers) { ++ fixer = shadow_fixers; ++ shadow_fixers = fixer->next; ++ /* Complete the rename transaction by deleting the ++ * shadowed object then setting the object header ++ to unshadowed. ++ */ ++ obj = yaffs_find_by_number(dev, fixer->shadowed_id); ++ if (obj) ++ yaffs_del_obj(obj); ++ ++ obj = yaffs_find_by_number(dev, fixer->obj_id); ++ ++ if (obj) ++ yaffs_update_oh(obj, NULL, 1, 0, 0, NULL); ++ ++ kfree(fixer); ++ } ++ } ++ ++ yaffs_release_temp_buffer(dev, chunk_data); ++ ++ if (alloc_failed) ++ return YAFFS_FAIL; ++ ++ yaffs_trace(YAFFS_TRACE_SCAN, "yaffs1_scan ends"); ++ ++ return YAFFS_OK; ++} +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_yaffs1.h linux-3.15-rc5/fs/yaffs2/yaffs_yaffs1.h +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_yaffs1.h 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_yaffs1.h 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,22 @@ ++/* ++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU Lesser General Public License version 2.1 as ++ * published by the Free Software Foundation. ++ * ++ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. ++ */ ++ ++#ifndef __YAFFS_YAFFS1_H__ ++#define __YAFFS_YAFFS1_H__ ++ ++#include "yaffs_guts.h" ++int yaffs1_scan(struct yaffs_dev *dev); ++ ++#endif +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_yaffs2.c linux-3.15-rc5/fs/yaffs2/yaffs_yaffs2.c +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_yaffs2.c 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_yaffs2.c 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,1534 @@ ++/* ++ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU General Public License version 2 as ++ * published by the Free Software Foundation. ++ */ ++ ++#include "yaffs_guts.h" ++#include "yaffs_trace.h" ++#include "yaffs_yaffs2.h" ++#include "yaffs_checkptrw.h" ++#include "yaffs_bitmap.h" ++#include "yaffs_nand.h" ++#include "yaffs_getblockinfo.h" ++#include "yaffs_verify.h" ++#include "yaffs_attribs.h" ++#include "yaffs_summary.h" ++ ++/* ++ * Checkpoints are really no benefit on very small partitions. ++ * ++ * To save space on small partitions don't bother with checkpoints unless ++ * the partition is at least this big. ++ */ ++#define YAFFS_CHECKPOINT_MIN_BLOCKS 60 ++#define YAFFS_SMALL_HOLE_THRESHOLD 4 ++ ++/* ++ * Oldest Dirty Sequence Number handling. ++ */ ++ ++/* yaffs_calc_oldest_dirty_seq() ++ * yaffs2_find_oldest_dirty_seq() ++ * Calculate the oldest dirty sequence number if we don't know it. ++ */ ++void yaffs_calc_oldest_dirty_seq(struct yaffs_dev *dev) ++{ ++ int i; ++ unsigned seq; ++ unsigned block_no = 0; ++ struct yaffs_block_info *b; ++ ++ if (!dev->param.is_yaffs2) ++ return; ++ ++ /* Find the oldest dirty sequence number. */ ++ seq = dev->seq_number + 1; ++ b = dev->block_info; ++ for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) { ++ if (b->block_state == YAFFS_BLOCK_STATE_FULL && ++ (b->pages_in_use - b->soft_del_pages) < ++ dev->param.chunks_per_block && ++ b->seq_number < seq) { ++ seq = b->seq_number; ++ block_no = i; ++ } ++ b++; ++ } ++ ++ if (block_no) { ++ dev->oldest_dirty_seq = seq; ++ dev->oldest_dirty_block = block_no; ++ } ++} ++ ++void yaffs2_find_oldest_dirty_seq(struct yaffs_dev *dev) ++{ ++ if (!dev->param.is_yaffs2) ++ return; ++ ++ if (!dev->oldest_dirty_seq) ++ yaffs_calc_oldest_dirty_seq(dev); ++} ++ ++/* ++ * yaffs_clear_oldest_dirty_seq() ++ * Called when a block is erased or marked bad. (ie. when its seq_number ++ * becomes invalid). If the value matches the oldest then we clear ++ * dev->oldest_dirty_seq to force its recomputation. ++ */ ++void yaffs2_clear_oldest_dirty_seq(struct yaffs_dev *dev, ++ struct yaffs_block_info *bi) ++{ ++ ++ if (!dev->param.is_yaffs2) ++ return; ++ ++ if (!bi || bi->seq_number == dev->oldest_dirty_seq) { ++ dev->oldest_dirty_seq = 0; ++ dev->oldest_dirty_block = 0; ++ } ++} ++ ++/* ++ * yaffs2_update_oldest_dirty_seq() ++ * Update the oldest dirty sequence number whenever we dirty a block. ++ * Only do this if the oldest_dirty_seq is actually being tracked. ++ */ ++void yaffs2_update_oldest_dirty_seq(struct yaffs_dev *dev, unsigned block_no, ++ struct yaffs_block_info *bi) ++{ ++ if (!dev->param.is_yaffs2) ++ return; ++ ++ if (dev->oldest_dirty_seq) { ++ if (dev->oldest_dirty_seq > bi->seq_number) { ++ dev->oldest_dirty_seq = bi->seq_number; ++ dev->oldest_dirty_block = block_no; ++ } ++ } ++} ++ ++int yaffs_block_ok_for_gc(struct yaffs_dev *dev, struct yaffs_block_info *bi) ++{ ++ ++ if (!dev->param.is_yaffs2) ++ return 1; /* disqualification only applies to yaffs2. */ ++ ++ if (!bi->has_shrink_hdr) ++ return 1; /* can gc */ ++ ++ yaffs2_find_oldest_dirty_seq(dev); ++ ++ /* Can't do gc of this block if there are any blocks older than this ++ * one that have discarded pages. ++ */ ++ return (bi->seq_number <= dev->oldest_dirty_seq); ++} ++ ++/* ++ * yaffs2_find_refresh_block() ++ * periodically finds the oldest full block by sequence number for refreshing. ++ * Only for yaffs2. ++ */ ++u32 yaffs2_find_refresh_block(struct yaffs_dev *dev) ++{ ++ u32 b; ++ u32 oldest = 0; ++ u32 oldest_seq = 0; ++ struct yaffs_block_info *bi; ++ ++ if (!dev->param.is_yaffs2) ++ return oldest; ++ ++ /* ++ * If refresh period < 10 then refreshing is disabled. ++ */ ++ if (dev->param.refresh_period < 10) ++ return oldest; ++ ++ /* ++ * Fix broken values. ++ */ ++ if (dev->refresh_skip > dev->param.refresh_period) ++ dev->refresh_skip = dev->param.refresh_period; ++ ++ if (dev->refresh_skip > 0) ++ return oldest; ++ ++ /* ++ * Refresh skip is now zero. ++ * We'll do a refresh this time around.... ++ * Update the refresh skip and find the oldest block. ++ */ ++ dev->refresh_skip = dev->param.refresh_period; ++ dev->refresh_count++; ++ bi = dev->block_info; ++ for (b = dev->internal_start_block; b <= dev->internal_end_block; b++) { ++ ++ if (bi->block_state == YAFFS_BLOCK_STATE_FULL) { ++ ++ if (oldest < 1 || bi->seq_number < oldest_seq) { ++ oldest = b; ++ oldest_seq = bi->seq_number; ++ } ++ } ++ bi++; ++ } ++ ++ if (oldest > 0) { ++ yaffs_trace(YAFFS_TRACE_GC, ++ "GC refresh count %d selected block %d with seq_number %d", ++ dev->refresh_count, oldest, oldest_seq); ++ } ++ ++ return oldest; ++} ++ ++int yaffs2_checkpt_required(struct yaffs_dev *dev) ++{ ++ int nblocks; ++ ++ if (!dev->param.is_yaffs2) ++ return 0; ++ ++ nblocks = dev->internal_end_block - dev->internal_start_block + 1; ++ ++ return !dev->param.skip_checkpt_wr && ++ !dev->read_only && (nblocks >= YAFFS_CHECKPOINT_MIN_BLOCKS); ++} ++ ++int yaffs_calc_checkpt_blocks_required(struct yaffs_dev *dev) ++{ ++ int retval; ++ int n_bytes = 0; ++ int n_blocks; ++ int dev_blocks; ++ ++ if (!dev->param.is_yaffs2) ++ return 0; ++ ++ if (!dev->checkpoint_blocks_required && yaffs2_checkpt_required(dev)) { ++ /* Not a valid value so recalculate */ ++ dev_blocks = dev->param.end_block - dev->param.start_block + 1; ++ n_bytes += sizeof(struct yaffs_checkpt_validity); ++ n_bytes += sizeof(struct yaffs_checkpt_dev); ++ n_bytes += dev_blocks * sizeof(struct yaffs_block_info); ++ n_bytes += dev_blocks * dev->chunk_bit_stride; ++ n_bytes += ++ (sizeof(struct yaffs_checkpt_obj) + sizeof(u32)) * ++ dev->n_obj; ++ n_bytes += (dev->tnode_size + sizeof(u32)) * dev->n_tnodes; ++ n_bytes += sizeof(struct yaffs_checkpt_validity); ++ n_bytes += sizeof(u32); /* checksum */ ++ ++ /* Round up and add 2 blocks to allow for some bad blocks, ++ * so add 3 */ ++ ++ n_blocks = ++ (n_bytes / ++ (dev->data_bytes_per_chunk * ++ dev->param.chunks_per_block)) + 3; ++ ++ dev->checkpoint_blocks_required = n_blocks; ++ } ++ ++ retval = dev->checkpoint_blocks_required - dev->blocks_in_checkpt; ++ if (retval < 0) ++ retval = 0; ++ return retval; ++} ++ ++/*--------------------- Checkpointing --------------------*/ ++ ++static int yaffs2_wr_checkpt_validity_marker(struct yaffs_dev *dev, int head) ++{ ++ struct yaffs_checkpt_validity cp; ++ ++ memset(&cp, 0, sizeof(cp)); ++ ++ cp.struct_type = sizeof(cp); ++ cp.magic = YAFFS_MAGIC; ++ cp.version = YAFFS_CHECKPOINT_VERSION; ++ cp.head = (head) ? 1 : 0; ++ ++ return (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp)) ? 1 : 0; ++} ++ ++static int yaffs2_rd_checkpt_validity_marker(struct yaffs_dev *dev, int head) ++{ ++ struct yaffs_checkpt_validity cp; ++ int ok; ++ ++ ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == sizeof(cp)); ++ ++ if (ok) ++ ok = (cp.struct_type == sizeof(cp)) && ++ (cp.magic == YAFFS_MAGIC) && ++ (cp.version == YAFFS_CHECKPOINT_VERSION) && ++ (cp.head == ((head) ? 1 : 0)); ++ return ok ? 1 : 0; ++} ++ ++static void yaffs2_dev_to_checkpt_dev(struct yaffs_checkpt_dev *cp, ++ struct yaffs_dev *dev) ++{ ++ cp->n_erased_blocks = dev->n_erased_blocks; ++ cp->alloc_block = dev->alloc_block; ++ cp->alloc_page = dev->alloc_page; ++ cp->n_free_chunks = dev->n_free_chunks; ++ ++ cp->n_deleted_files = dev->n_deleted_files; ++ cp->n_unlinked_files = dev->n_unlinked_files; ++ cp->n_bg_deletions = dev->n_bg_deletions; ++ cp->seq_number = dev->seq_number; ++ ++} ++ ++static void yaffs_checkpt_dev_to_dev(struct yaffs_dev *dev, ++ struct yaffs_checkpt_dev *cp) ++{ ++ dev->n_erased_blocks = cp->n_erased_blocks; ++ dev->alloc_block = cp->alloc_block; ++ dev->alloc_page = cp->alloc_page; ++ dev->n_free_chunks = cp->n_free_chunks; ++ ++ dev->n_deleted_files = cp->n_deleted_files; ++ dev->n_unlinked_files = cp->n_unlinked_files; ++ dev->n_bg_deletions = cp->n_bg_deletions; ++ dev->seq_number = cp->seq_number; ++} ++ ++static int yaffs2_wr_checkpt_dev(struct yaffs_dev *dev) ++{ ++ struct yaffs_checkpt_dev cp; ++ u32 n_bytes; ++ u32 n_blocks = dev->internal_end_block - dev->internal_start_block + 1; ++ int ok; ++ ++ /* Write device runtime values */ ++ yaffs2_dev_to_checkpt_dev(&cp, dev); ++ cp.struct_type = sizeof(cp); ++ ++ ok = (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp)); ++ if (!ok) ++ return 0; ++ ++ /* Write block info */ ++ n_bytes = n_blocks * sizeof(struct yaffs_block_info); ++ ok = (yaffs2_checkpt_wr(dev, dev->block_info, n_bytes) == n_bytes); ++ if (!ok) ++ return 0; ++ ++ /* Write chunk bits */ ++ n_bytes = n_blocks * dev->chunk_bit_stride; ++ ok = (yaffs2_checkpt_wr(dev, dev->chunk_bits, n_bytes) == n_bytes); ++ ++ return ok ? 1 : 0; ++} ++ ++static int yaffs2_rd_checkpt_dev(struct yaffs_dev *dev) ++{ ++ struct yaffs_checkpt_dev cp; ++ u32 n_bytes; ++ u32 n_blocks = ++ (dev->internal_end_block - dev->internal_start_block + 1); ++ int ok; ++ ++ ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == sizeof(cp)); ++ if (!ok) ++ return 0; ++ ++ if (cp.struct_type != sizeof(cp)) ++ return 0; ++ ++ yaffs_checkpt_dev_to_dev(dev, &cp); ++ ++ n_bytes = n_blocks * sizeof(struct yaffs_block_info); ++ ++ ok = (yaffs2_checkpt_rd(dev, dev->block_info, n_bytes) == n_bytes); ++ ++ if (!ok) ++ return 0; ++ ++ n_bytes = n_blocks * dev->chunk_bit_stride; ++ ++ ok = (yaffs2_checkpt_rd(dev, dev->chunk_bits, n_bytes) == n_bytes); ++ ++ return ok ? 1 : 0; ++} ++ ++static void yaffs2_obj_checkpt_obj(struct yaffs_checkpt_obj *cp, ++ struct yaffs_obj *obj) ++{ ++ cp->obj_id = obj->obj_id; ++ cp->parent_id = (obj->parent) ? obj->parent->obj_id : 0; ++ cp->hdr_chunk = obj->hdr_chunk; ++ cp->variant_type = obj->variant_type; ++ cp->deleted = obj->deleted; ++ cp->soft_del = obj->soft_del; ++ cp->unlinked = obj->unlinked; ++ cp->fake = obj->fake; ++ cp->rename_allowed = obj->rename_allowed; ++ cp->unlink_allowed = obj->unlink_allowed; ++ cp->serial = obj->serial; ++ cp->n_data_chunks = obj->n_data_chunks; ++ ++ if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE) ++ cp->size_or_equiv_obj = obj->variant.file_variant.file_size; ++ else if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) ++ cp->size_or_equiv_obj = obj->variant.hardlink_variant.equiv_id; ++} ++ ++static int yaffs2_checkpt_obj_to_obj(struct yaffs_obj *obj, ++ struct yaffs_checkpt_obj *cp) ++{ ++ struct yaffs_obj *parent; ++ ++ if (obj->variant_type != cp->variant_type) { ++ yaffs_trace(YAFFS_TRACE_ERROR, ++ "Checkpoint read object %d type %d chunk %d does not match existing object type %d", ++ cp->obj_id, cp->variant_type, cp->hdr_chunk, ++ obj->variant_type); ++ return 0; ++ } ++ ++ obj->obj_id = cp->obj_id; ++ ++ if (cp->parent_id) ++ parent = yaffs_find_or_create_by_number(obj->my_dev, ++ cp->parent_id, ++ YAFFS_OBJECT_TYPE_DIRECTORY); ++ else ++ parent = NULL; ++ ++ if (parent) { ++ if (parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) { ++ yaffs_trace(YAFFS_TRACE_ALWAYS, ++ "Checkpoint read object %d parent %d type %d chunk %d Parent type, %d, not directory", ++ cp->obj_id, cp->parent_id, ++ cp->variant_type, cp->hdr_chunk, ++ parent->variant_type); ++ return 0; ++ } ++ yaffs_add_obj_to_dir(parent, obj); ++ } ++ ++ obj->hdr_chunk = cp->hdr_chunk; ++ obj->variant_type = cp->variant_type; ++ obj->deleted = cp->deleted; ++ obj->soft_del = cp->soft_del; ++ obj->unlinked = cp->unlinked; ++ obj->fake = cp->fake; ++ obj->rename_allowed = cp->rename_allowed; ++ obj->unlink_allowed = cp->unlink_allowed; ++ obj->serial = cp->serial; ++ obj->n_data_chunks = cp->n_data_chunks; ++ ++ if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE) ++ obj->variant.file_variant.file_size = cp->size_or_equiv_obj; ++ else if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) ++ obj->variant.hardlink_variant.equiv_id = cp->size_or_equiv_obj; ++ ++ if (obj->hdr_chunk > 0) ++ obj->lazy_loaded = 1; ++ return 1; ++} ++ ++static int yaffs2_checkpt_tnode_worker(struct yaffs_obj *in, ++ struct yaffs_tnode *tn, u32 level, ++ int chunk_offset) ++{ ++ int i; ++ struct yaffs_dev *dev = in->my_dev; ++ int ok = 1; ++ u32 base_offset; ++ ++ if (!tn) ++ return 1; ++ ++ if (level > 0) { ++ for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) { ++ if (!tn->internal[i]) ++ continue; ++ ok = yaffs2_checkpt_tnode_worker(in, ++ tn->internal[i], ++ level - 1, ++ (chunk_offset << ++ YAFFS_TNODES_INTERNAL_BITS) + i); ++ } ++ return ok; ++ } ++ ++ /* Level 0 tnode */ ++ base_offset = chunk_offset << YAFFS_TNODES_LEVEL0_BITS; ++ ok = (yaffs2_checkpt_wr(dev, &base_offset, sizeof(base_offset)) == ++ sizeof(base_offset)); ++ if (ok) ++ ok = (yaffs2_checkpt_wr(dev, tn, dev->tnode_size) == ++ dev->tnode_size); ++ ++ return ok; ++} ++ ++static int yaffs2_wr_checkpt_tnodes(struct yaffs_obj *obj) ++{ ++ u32 end_marker = ~0; ++ int ok = 1; ++ ++ if (obj->variant_type != YAFFS_OBJECT_TYPE_FILE) ++ return ok; ++ ++ ok = yaffs2_checkpt_tnode_worker(obj, ++ obj->variant.file_variant.top, ++ obj->variant.file_variant. ++ top_level, 0); ++ if (ok) ++ ok = (yaffs2_checkpt_wr(obj->my_dev, &end_marker, ++ sizeof(end_marker)) == sizeof(end_marker)); ++ ++ return ok ? 1 : 0; ++} ++ ++static int yaffs2_rd_checkpt_tnodes(struct yaffs_obj *obj) ++{ ++ u32 base_chunk; ++ int ok = 1; ++ struct yaffs_dev *dev = obj->my_dev; ++ struct yaffs_file_var *file_stuct_ptr = &obj->variant.file_variant; ++ struct yaffs_tnode *tn; ++ int nread = 0; ++ ++ ok = (yaffs2_checkpt_rd(dev, &base_chunk, sizeof(base_chunk)) == ++ sizeof(base_chunk)); ++ ++ while (ok && (~base_chunk)) { ++ nread++; ++ /* Read level 0 tnode */ ++ ++ tn = yaffs_get_tnode(dev); ++ if (tn) ++ ok = (yaffs2_checkpt_rd(dev, tn, dev->tnode_size) == ++ dev->tnode_size); ++ else ++ ok = 0; ++ ++ if (tn && ok) ++ ok = yaffs_add_find_tnode_0(dev, ++ file_stuct_ptr, ++ base_chunk, tn) ? 1 : 0; ++ ++ if (ok) ++ ok = (yaffs2_checkpt_rd ++ (dev, &base_chunk, ++ sizeof(base_chunk)) == sizeof(base_chunk)); ++ } ++ ++ yaffs_trace(YAFFS_TRACE_CHECKPOINT, ++ "Checkpoint read tnodes %d records, last %d. ok %d", ++ nread, base_chunk, ok); ++ ++ return ok ? 1 : 0; ++} ++ ++static int yaffs2_wr_checkpt_objs(struct yaffs_dev *dev) ++{ ++ struct yaffs_obj *obj; ++ struct yaffs_checkpt_obj cp; ++ int i; ++ int ok = 1; ++ struct list_head *lh; ++ ++ /* Iterate through the objects in each hash entry, ++ * dumping them to the checkpointing stream. ++ */ ++ ++ for (i = 0; ok && i < YAFFS_NOBJECT_BUCKETS; i++) { ++ list_for_each(lh, &dev->obj_bucket[i].list) { ++ obj = list_entry(lh, struct yaffs_obj, hash_link); ++ if (!obj->defered_free) { ++ yaffs2_obj_checkpt_obj(&cp, obj); ++ cp.struct_type = sizeof(cp); ++ ++ yaffs_trace(YAFFS_TRACE_CHECKPOINT, ++ "Checkpoint write object %d parent %d type %d chunk %d obj addr %p", ++ cp.obj_id, cp.parent_id, ++ cp.variant_type, cp.hdr_chunk, obj); ++ ++ ok = (yaffs2_checkpt_wr(dev, &cp, ++ sizeof(cp)) == sizeof(cp)); ++ ++ if (ok && ++ obj->variant_type == ++ YAFFS_OBJECT_TYPE_FILE) ++ ok = yaffs2_wr_checkpt_tnodes(obj); ++ } ++ } ++ } ++ ++ /* Dump end of list */ ++ memset(&cp, 0xff, sizeof(struct yaffs_checkpt_obj)); ++ cp.struct_type = sizeof(cp); ++ ++ if (ok) ++ ok = (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp)); ++ ++ return ok ? 1 : 0; ++} ++ ++static int yaffs2_rd_checkpt_objs(struct yaffs_dev *dev) ++{ ++ struct yaffs_obj *obj; ++ struct yaffs_checkpt_obj cp; ++ int ok = 1; ++ int done = 0; ++ LIST_HEAD(hard_list); ++ ++ ++ while (ok && !done) { ++ ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == sizeof(cp)); ++ if (cp.struct_type != sizeof(cp)) { ++ yaffs_trace(YAFFS_TRACE_CHECKPOINT, ++ "struct size %d instead of %d ok %d", ++ cp.struct_type, (int)sizeof(cp), ok); ++ ok = 0; ++ } ++ ++ yaffs_trace(YAFFS_TRACE_CHECKPOINT, ++ "Checkpoint read object %d parent %d type %d chunk %d ", ++ cp.obj_id, cp.parent_id, cp.variant_type, ++ cp.hdr_chunk); ++ ++ if (ok && cp.obj_id == ~0) { ++ done = 1; ++ } else if (ok) { ++ obj = ++ yaffs_find_or_create_by_number(dev, cp.obj_id, ++ cp.variant_type); ++ if (obj) { ++ ok = yaffs2_checkpt_obj_to_obj(obj, &cp); ++ if (!ok) ++ break; ++ if (obj->variant_type == ++ YAFFS_OBJECT_TYPE_FILE) { ++ ok = yaffs2_rd_checkpt_tnodes(obj); ++ } else if (obj->variant_type == ++ YAFFS_OBJECT_TYPE_HARDLINK) { ++ list_add(&obj->hard_links, &hard_list); ++ } ++ } else { ++ ok = 0; ++ } ++ } ++ } ++ ++ if (ok) ++ yaffs_link_fixup(dev, &hard_list); ++ ++ return ok ? 1 : 0; ++} ++ ++static int yaffs2_wr_checkpt_sum(struct yaffs_dev *dev) ++{ ++ u32 checkpt_sum; ++ int ok; ++ ++ yaffs2_get_checkpt_sum(dev, &checkpt_sum); ++ ++ ok = (yaffs2_checkpt_wr(dev, &checkpt_sum, sizeof(checkpt_sum)) == ++ sizeof(checkpt_sum)); ++ ++ if (!ok) ++ return 0; ++ ++ return 1; ++} ++ ++static int yaffs2_rd_checkpt_sum(struct yaffs_dev *dev) ++{ ++ u32 checkpt_sum0; ++ u32 checkpt_sum1; ++ int ok; ++ ++ yaffs2_get_checkpt_sum(dev, &checkpt_sum0); ++ ++ ok = (yaffs2_checkpt_rd(dev, &checkpt_sum1, sizeof(checkpt_sum1)) == ++ sizeof(checkpt_sum1)); ++ ++ if (!ok) ++ return 0; ++ ++ if (checkpt_sum0 != checkpt_sum1) ++ return 0; ++ ++ return 1; ++} ++ ++static int yaffs2_wr_checkpt_data(struct yaffs_dev *dev) ++{ ++ int ok = 1; ++ ++ if (!yaffs2_checkpt_required(dev)) { ++ yaffs_trace(YAFFS_TRACE_CHECKPOINT, ++ "skipping checkpoint write"); ++ ok = 0; ++ } ++ ++ if (ok) ++ ok = yaffs2_checkpt_open(dev, 1); ++ ++ if (ok) { ++ yaffs_trace(YAFFS_TRACE_CHECKPOINT, ++ "write checkpoint validity"); ++ ok = yaffs2_wr_checkpt_validity_marker(dev, 1); ++ } ++ if (ok) { ++ yaffs_trace(YAFFS_TRACE_CHECKPOINT, ++ "write checkpoint device"); ++ ok = yaffs2_wr_checkpt_dev(dev); ++ } ++ if (ok) { ++ yaffs_trace(YAFFS_TRACE_CHECKPOINT, ++ "write checkpoint objects"); ++ ok = yaffs2_wr_checkpt_objs(dev); ++ } ++ if (ok) { ++ yaffs_trace(YAFFS_TRACE_CHECKPOINT, ++ "write checkpoint validity"); ++ ok = yaffs2_wr_checkpt_validity_marker(dev, 0); ++ } ++ ++ if (ok) ++ ok = yaffs2_wr_checkpt_sum(dev); ++ ++ if (!yaffs_checkpt_close(dev)) ++ ok = 0; ++ ++ if (ok) ++ dev->is_checkpointed = 1; ++ else ++ dev->is_checkpointed = 0; ++ ++ return dev->is_checkpointed; ++} ++ ++static int yaffs2_rd_checkpt_data(struct yaffs_dev *dev) ++{ ++ int ok = 1; ++ ++ if (!dev->param.is_yaffs2) ++ ok = 0; ++ ++ if (ok && dev->param.skip_checkpt_rd) { ++ yaffs_trace(YAFFS_TRACE_CHECKPOINT, ++ "skipping checkpoint read"); ++ ok = 0; ++ } ++ ++ if (ok) ++ ok = yaffs2_checkpt_open(dev, 0); /* open for read */ ++ ++ if (ok) { ++ yaffs_trace(YAFFS_TRACE_CHECKPOINT, ++ "read checkpoint validity"); ++ ok = yaffs2_rd_checkpt_validity_marker(dev, 1); ++ } ++ if (ok) { ++ yaffs_trace(YAFFS_TRACE_CHECKPOINT, ++ "read checkpoint device"); ++ ok = yaffs2_rd_checkpt_dev(dev); ++ } ++ if (ok) { ++ yaffs_trace(YAFFS_TRACE_CHECKPOINT, ++ "read checkpoint objects"); ++ ok = yaffs2_rd_checkpt_objs(dev); ++ } ++ if (ok) { ++ yaffs_trace(YAFFS_TRACE_CHECKPOINT, ++ "read checkpoint validity"); ++ ok = yaffs2_rd_checkpt_validity_marker(dev, 0); ++ } ++ ++ if (ok) { ++ ok = yaffs2_rd_checkpt_sum(dev); ++ yaffs_trace(YAFFS_TRACE_CHECKPOINT, ++ "read checkpoint checksum %d", ok); ++ } ++ ++ if (!yaffs_checkpt_close(dev)) ++ ok = 0; ++ ++ if (ok) ++ dev->is_checkpointed = 1; ++ else ++ dev->is_checkpointed = 0; ++ ++ return ok ? 1 : 0; ++} ++ ++void yaffs2_checkpt_invalidate(struct yaffs_dev *dev) ++{ ++ if (dev->is_checkpointed || dev->blocks_in_checkpt > 0) { ++ dev->is_checkpointed = 0; ++ yaffs2_checkpt_invalidate_stream(dev); ++ } ++ if (dev->param.sb_dirty_fn) ++ dev->param.sb_dirty_fn(dev); ++} ++ ++int yaffs_checkpoint_save(struct yaffs_dev *dev) ++{ ++ yaffs_trace(YAFFS_TRACE_CHECKPOINT, ++ "save entry: is_checkpointed %d", ++ dev->is_checkpointed); ++ ++ yaffs_verify_objects(dev); ++ yaffs_verify_blocks(dev); ++ yaffs_verify_free_chunks(dev); ++ ++ if (!dev->is_checkpointed) { ++ yaffs2_checkpt_invalidate(dev); ++ yaffs2_wr_checkpt_data(dev); ++ } ++ ++ yaffs_trace(YAFFS_TRACE_CHECKPOINT | YAFFS_TRACE_MOUNT, ++ "save exit: is_checkpointed %d", ++ dev->is_checkpointed); ++ ++ return dev->is_checkpointed; ++} ++ ++int yaffs2_checkpt_restore(struct yaffs_dev *dev) ++{ ++ int retval; ++ ++ yaffs_trace(YAFFS_TRACE_CHECKPOINT, ++ "restore entry: is_checkpointed %d", ++ dev->is_checkpointed); ++ ++ retval = yaffs2_rd_checkpt_data(dev); ++ ++ if (dev->is_checkpointed) { ++ yaffs_verify_objects(dev); ++ yaffs_verify_blocks(dev); ++ yaffs_verify_free_chunks(dev); ++ } ++ ++ yaffs_trace(YAFFS_TRACE_CHECKPOINT, ++ "restore exit: is_checkpointed %d", ++ dev->is_checkpointed); ++ ++ return retval; ++} ++ ++int yaffs2_handle_hole(struct yaffs_obj *obj, loff_t new_size) ++{ ++ /* if new_size > old_file_size. ++ * We're going to be writing a hole. ++ * If the hole is small then write zeros otherwise write a start ++ * of hole marker. ++ */ ++ loff_t old_file_size; ++ loff_t increase; ++ int small_hole; ++ int result = YAFFS_OK; ++ struct yaffs_dev *dev = NULL; ++ u8 *local_buffer = NULL; ++ int small_increase_ok = 0; ++ ++ if (!obj) ++ return YAFFS_FAIL; ++ ++ if (obj->variant_type != YAFFS_OBJECT_TYPE_FILE) ++ return YAFFS_FAIL; ++ ++ dev = obj->my_dev; ++ ++ /* Bail out if not yaffs2 mode */ ++ if (!dev->param.is_yaffs2) ++ return YAFFS_OK; ++ ++ old_file_size = obj->variant.file_variant.file_size; ++ ++ if (new_size <= old_file_size) ++ return YAFFS_OK; ++ ++ increase = new_size - old_file_size; ++ ++ if (increase < YAFFS_SMALL_HOLE_THRESHOLD * dev->data_bytes_per_chunk && ++ yaffs_check_alloc_available(dev, YAFFS_SMALL_HOLE_THRESHOLD + 1)) ++ small_hole = 1; ++ else ++ small_hole = 0; ++ ++ if (small_hole) ++ local_buffer = yaffs_get_temp_buffer(dev); ++ ++ if (local_buffer) { ++ /* fill hole with zero bytes */ ++ loff_t pos = old_file_size; ++ int this_write; ++ int written; ++ memset(local_buffer, 0, dev->data_bytes_per_chunk); ++ small_increase_ok = 1; ++ ++ while (increase > 0 && small_increase_ok) { ++ this_write = increase; ++ if (this_write > dev->data_bytes_per_chunk) ++ this_write = dev->data_bytes_per_chunk; ++ written = ++ yaffs_do_file_wr(obj, local_buffer, pos, this_write, ++ 0); ++ if (written == this_write) { ++ pos += this_write; ++ increase -= this_write; ++ } else { ++ small_increase_ok = 0; ++ } ++ } ++ ++ yaffs_release_temp_buffer(dev, local_buffer); ++ ++ /* If out of space then reverse any chunks we've added */ ++ if (!small_increase_ok) ++ yaffs_resize_file_down(obj, old_file_size); ++ } ++ ++ if (!small_increase_ok && ++ obj->parent && ++ obj->parent->obj_id != YAFFS_OBJECTID_UNLINKED && ++ obj->parent->obj_id != YAFFS_OBJECTID_DELETED) { ++ /* Write a hole start header with the old file size */ ++ yaffs_update_oh(obj, NULL, 0, 1, 0, NULL); ++ } ++ ++ return result; ++} ++ ++struct yaffs_block_index { ++ int seq; ++ int block; ++}; ++ ++static int yaffs2_ybicmp(const void *a, const void *b) ++{ ++ int aseq = ((struct yaffs_block_index *)a)->seq; ++ int bseq = ((struct yaffs_block_index *)b)->seq; ++ int ablock = ((struct yaffs_block_index *)a)->block; ++ int bblock = ((struct yaffs_block_index *)b)->block; ++ ++ if (aseq == bseq) ++ return ablock - bblock; ++ ++ return aseq - bseq; ++} ++ ++static inline int yaffs2_scan_chunk(struct yaffs_dev *dev, ++ struct yaffs_block_info *bi, ++ int blk, int chunk_in_block, ++ int *found_chunks, ++ u8 *chunk_data, ++ struct list_head *hard_list, ++ int summary_available) ++{ ++ struct yaffs_obj_hdr *oh; ++ struct yaffs_obj *in; ++ struct yaffs_obj *parent; ++ int equiv_id; ++ loff_t file_size; ++ int is_shrink; ++ int is_unlinked; ++ struct yaffs_ext_tags tags; ++ int result; ++ int alloc_failed = 0; ++ int chunk = blk * dev->param.chunks_per_block + chunk_in_block; ++ struct yaffs_file_var *file_var; ++ struct yaffs_hardlink_var *hl_var; ++ struct yaffs_symlink_var *sl_var; ++ ++ if (summary_available) { ++ result = yaffs_summary_fetch(dev, &tags, chunk_in_block); ++ tags.seq_number = bi->seq_number; ++ } ++ ++ if (!summary_available || tags.obj_id == 0) { ++ result = yaffs_rd_chunk_tags_nand(dev, chunk, NULL, &tags); ++ dev->tags_used++; ++ } else { ++ dev->summary_used++; ++ } ++ ++ /* Let's have a good look at this chunk... */ ++ ++ if (!tags.chunk_used) { ++ /* An unassigned chunk in the block. ++ * If there are used chunks after this one, then ++ * it is a chunk that was skipped due to failing ++ * the erased check. Just skip it so that it can ++ * be deleted. ++ * But, more typically, We get here when this is ++ * an unallocated chunk and his means that ++ * either the block is empty or this is the one ++ * being allocated from ++ */ ++ ++ if (*found_chunks) { ++ /* This is a chunk that was skipped due ++ * to failing the erased check */ ++ } else if (chunk_in_block == 0) { ++ /* We're looking at the first chunk in ++ * the block so the block is unused */ ++ bi->block_state = YAFFS_BLOCK_STATE_EMPTY; ++ dev->n_erased_blocks++; ++ } else { ++ if (bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN || ++ bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING) { ++ if (dev->seq_number == bi->seq_number) { ++ /* Allocating from this block*/ ++ yaffs_trace(YAFFS_TRACE_SCAN, ++ " Allocating from %d %d", ++ blk, chunk_in_block); ++ ++ bi->block_state = ++ YAFFS_BLOCK_STATE_ALLOCATING; ++ dev->alloc_block = blk; ++ dev->alloc_page = chunk_in_block; ++ dev->alloc_block_finder = blk; ++ } else { ++ /* This is a partially written block ++ * that is not the current ++ * allocation block. ++ */ ++ yaffs_trace(YAFFS_TRACE_SCAN, ++ "Partially written block %d detected. gc will fix this.", ++ blk); ++ } ++ } ++ } ++ ++ dev->n_free_chunks++; ++ ++ } else if (tags.ecc_result == ++ YAFFS_ECC_RESULT_UNFIXED) { ++ yaffs_trace(YAFFS_TRACE_SCAN, ++ " Unfixed ECC in chunk(%d:%d), chunk ignored", ++ blk, chunk_in_block); ++ dev->n_free_chunks++; ++ } else if (tags.obj_id > YAFFS_MAX_OBJECT_ID || ++ tags.chunk_id > YAFFS_MAX_CHUNK_ID || ++ tags.obj_id == YAFFS_OBJECTID_SUMMARY || ++ (tags.chunk_id > 0 && ++ tags.n_bytes > dev->data_bytes_per_chunk) || ++ tags.seq_number != bi->seq_number) { ++ yaffs_trace(YAFFS_TRACE_SCAN, ++ "Chunk (%d:%d) with bad tags:obj = %d, chunk_id = %d, n_bytes = %d, ignored", ++ blk, chunk_in_block, tags.obj_id, ++ tags.chunk_id, tags.n_bytes); ++ dev->n_free_chunks++; ++ } else if (tags.chunk_id > 0) { ++ /* chunk_id > 0 so it is a data chunk... */ ++ loff_t endpos; ++ loff_t chunk_base = (tags.chunk_id - 1) * ++ dev->data_bytes_per_chunk; ++ ++ *found_chunks = 1; ++ ++ yaffs_set_chunk_bit(dev, blk, chunk_in_block); ++ bi->pages_in_use++; ++ ++ in = yaffs_find_or_create_by_number(dev, ++ tags.obj_id, ++ YAFFS_OBJECT_TYPE_FILE); ++ if (!in) ++ /* Out of memory */ ++ alloc_failed = 1; ++ ++ if (in && ++ in->variant_type == YAFFS_OBJECT_TYPE_FILE && ++ chunk_base < in->variant.file_variant.shrink_size) { ++ /* This has not been invalidated by ++ * a resize */ ++ if (!yaffs_put_chunk_in_file(in, tags.chunk_id, ++ chunk, -1)) ++ alloc_failed = 1; ++ ++ /* File size is calculated by looking at ++ * the data chunks if we have not ++ * seen an object header yet. ++ * Stop this practice once we find an ++ * object header. ++ */ ++ endpos = chunk_base + tags.n_bytes; ++ ++ if (!in->valid && ++ in->variant.file_variant.scanned_size < endpos) { ++ in->variant.file_variant. ++ scanned_size = endpos; ++ in->variant.file_variant. ++ file_size = endpos; ++ } ++ } else if (in) { ++ /* This chunk has been invalidated by a ++ * resize, or a past file deletion ++ * so delete the chunk*/ ++ yaffs_chunk_del(dev, chunk, 1, __LINE__); ++ } ++ } else { ++ /* chunk_id == 0, so it is an ObjectHeader. ++ * Thus, we read in the object header and make ++ * the object ++ */ ++ *found_chunks = 1; ++ ++ yaffs_set_chunk_bit(dev, blk, chunk_in_block); ++ bi->pages_in_use++; ++ ++ oh = NULL; ++ in = NULL; ++ ++ if (tags.extra_available) { ++ in = yaffs_find_or_create_by_number(dev, ++ tags.obj_id, ++ tags.extra_obj_type); ++ if (!in) ++ alloc_failed = 1; ++ } ++ ++ if (!in || ++ (!in->valid && dev->param.disable_lazy_load) || ++ tags.extra_shadows || ++ (!in->valid && (tags.obj_id == YAFFS_OBJECTID_ROOT || ++ tags.obj_id == YAFFS_OBJECTID_LOSTNFOUND))) { ++ ++ /* If we don't have valid info then we ++ * need to read the chunk ++ * TODO In future we can probably defer ++ * reading the chunk and living with ++ * invalid data until needed. ++ */ ++ ++ result = yaffs_rd_chunk_tags_nand(dev, ++ chunk, ++ chunk_data, ++ NULL); ++ ++ oh = (struct yaffs_obj_hdr *)chunk_data; ++ ++ if (dev->param.inband_tags) { ++ /* Fix up the header if they got ++ * corrupted by inband tags */ ++ oh->shadows_obj = ++ oh->inband_shadowed_obj_id; ++ oh->is_shrink = ++ oh->inband_is_shrink; ++ } ++ ++ if (!in) { ++ in = yaffs_find_or_create_by_number(dev, ++ tags.obj_id, oh->type); ++ if (!in) ++ alloc_failed = 1; ++ } ++ } ++ ++ if (!in) { ++ /* TODO Hoosterman we have a problem! */ ++ yaffs_trace(YAFFS_TRACE_ERROR, ++ "yaffs tragedy: Could not make object for object %d at chunk %d during scan", ++ tags.obj_id, chunk); ++ return YAFFS_FAIL; ++ } ++ ++ if (in->valid) { ++ /* We have already filled this one. ++ * We have a duplicate that will be ++ * discarded, but we first have to suck ++ * out resize info if it is a file. ++ */ ++ if ((in->variant_type == YAFFS_OBJECT_TYPE_FILE) && ++ ((oh && oh->type == YAFFS_OBJECT_TYPE_FILE) || ++ (tags.extra_available && ++ tags.extra_obj_type == YAFFS_OBJECT_TYPE_FILE) ++ )) { ++ loff_t this_size = (oh) ? ++ yaffs_oh_to_size(oh) : ++ tags.extra_file_size; ++ u32 parent_obj_id = (oh) ? ++ oh->parent_obj_id : ++ tags.extra_parent_id; ++ ++ is_shrink = (oh) ? ++ oh->is_shrink : ++ tags.extra_is_shrink; ++ ++ /* If it is deleted (unlinked ++ * at start also means deleted) ++ * we treat the file size as ++ * being zeroed at this point. ++ */ ++ if (parent_obj_id == YAFFS_OBJECTID_DELETED || ++ parent_obj_id == YAFFS_OBJECTID_UNLINKED) { ++ this_size = 0; ++ is_shrink = 1; ++ } ++ ++ if (is_shrink && ++ in->variant.file_variant.shrink_size > ++ this_size) ++ in->variant.file_variant.shrink_size = ++ this_size; ++ ++ if (is_shrink) ++ bi->has_shrink_hdr = 1; ++ } ++ /* Use existing - destroy this one. */ ++ yaffs_chunk_del(dev, chunk, 1, __LINE__); ++ } ++ ++ if (!in->valid && in->variant_type != ++ (oh ? oh->type : tags.extra_obj_type)) { ++ yaffs_trace(YAFFS_TRACE_ERROR, ++ "yaffs tragedy: Bad type, %d != %d, for object %d at chunk %d during scan", ++ oh ? oh->type : tags.extra_obj_type, ++ in->variant_type, tags.obj_id, ++ chunk); ++ in = yaffs_retype_obj(in, oh ? oh->type : tags.extra_obj_type); ++ } ++ ++ if (!in->valid && ++ (tags.obj_id == YAFFS_OBJECTID_ROOT || ++ tags.obj_id == YAFFS_OBJECTID_LOSTNFOUND)) { ++ /* We only load some info, don't fiddle ++ * with directory structure */ ++ in->valid = 1; ++ ++ if (oh) { ++ in->yst_mode = oh->yst_mode; ++ yaffs_load_attribs(in, oh); ++ in->lazy_loaded = 0; ++ } else { ++ in->lazy_loaded = 1; ++ } ++ in->hdr_chunk = chunk; ++ ++ } else if (!in->valid) { ++ /* we need to load this info */ ++ in->valid = 1; ++ in->hdr_chunk = chunk; ++ if (oh) { ++ in->variant_type = oh->type; ++ in->yst_mode = oh->yst_mode; ++ yaffs_load_attribs(in, oh); ++ ++ if (oh->shadows_obj > 0) ++ yaffs_handle_shadowed_obj(dev, ++ oh->shadows_obj, 1); ++ ++ yaffs_set_obj_name_from_oh(in, oh); ++ parent = yaffs_find_or_create_by_number(dev, ++ oh->parent_obj_id, ++ YAFFS_OBJECT_TYPE_DIRECTORY); ++ file_size = yaffs_oh_to_size(oh); ++ is_shrink = oh->is_shrink; ++ equiv_id = oh->equiv_id; ++ } else { ++ in->variant_type = tags.extra_obj_type; ++ parent = yaffs_find_or_create_by_number(dev, ++ tags.extra_parent_id, ++ YAFFS_OBJECT_TYPE_DIRECTORY); ++ file_size = tags.extra_file_size; ++ is_shrink = tags.extra_is_shrink; ++ equiv_id = tags.extra_equiv_id; ++ in->lazy_loaded = 1; ++ } ++ in->dirty = 0; ++ ++ if (!parent) ++ alloc_failed = 1; ++ ++ /* directory stuff... ++ * hook up to parent ++ */ ++ ++ if (parent && ++ parent->variant_type == YAFFS_OBJECT_TYPE_UNKNOWN) { ++ /* Set up as a directory */ ++ parent->variant_type = ++ YAFFS_OBJECT_TYPE_DIRECTORY; ++ INIT_LIST_HEAD(&parent-> ++ variant.dir_variant.children); ++ } else if (!parent || ++ parent->variant_type != ++ YAFFS_OBJECT_TYPE_DIRECTORY) { ++ /* Hoosterman, another problem.... ++ * Trying to use a non-directory as a directory ++ */ ++ ++ yaffs_trace(YAFFS_TRACE_ERROR, ++ "yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found." ++ ); ++ parent = dev->lost_n_found; ++ } ++ yaffs_add_obj_to_dir(parent, in); ++ ++ is_unlinked = (parent == dev->del_dir) || ++ (parent == dev->unlinked_dir); ++ ++ if (is_shrink) ++ /* Mark the block */ ++ bi->has_shrink_hdr = 1; ++ ++ /* Note re hardlinks. ++ * Since we might scan a hardlink before its equivalent ++ * object is scanned we put them all in a list. ++ * After scanning is complete, we should have all the ++ * objects, so we run through this list and fix up all ++ * the chains. ++ */ ++ ++ switch (in->variant_type) { ++ case YAFFS_OBJECT_TYPE_UNKNOWN: ++ /* Todo got a problem */ ++ break; ++ case YAFFS_OBJECT_TYPE_FILE: ++ file_var = &in->variant.file_variant; ++ if (file_var->scanned_size < file_size) { ++ /* This covers the case where the file ++ * size is greater than the data held. ++ * This will happen if the file is ++ * resized to be larger than its ++ * current data extents. ++ */ ++ file_var->file_size = file_size; ++ file_var->scanned_size = file_size; ++ } ++ ++ if (file_var->shrink_size > file_size) ++ file_var->shrink_size = file_size; ++ ++ break; ++ case YAFFS_OBJECT_TYPE_HARDLINK: ++ hl_var = &in->variant.hardlink_variant; ++ if (!is_unlinked) { ++ hl_var->equiv_id = equiv_id; ++ list_add(&in->hard_links, hard_list); ++ } ++ break; ++ case YAFFS_OBJECT_TYPE_DIRECTORY: ++ /* Do nothing */ ++ break; ++ case YAFFS_OBJECT_TYPE_SPECIAL: ++ /* Do nothing */ ++ break; ++ case YAFFS_OBJECT_TYPE_SYMLINK: ++ sl_var = &in->variant.symlink_variant; ++ if (oh) { ++ sl_var->alias = ++ yaffs_clone_str(oh->alias); ++ if (!sl_var->alias) ++ alloc_failed = 1; ++ } ++ break; ++ } ++ } ++ } ++ return alloc_failed ? YAFFS_FAIL : YAFFS_OK; ++} ++ ++int yaffs2_scan_backwards(struct yaffs_dev *dev) ++{ ++ int blk; ++ int block_iter; ++ int start_iter; ++ int end_iter; ++ int n_to_scan = 0; ++ enum yaffs_block_state state; ++ int c; ++ int deleted; ++ LIST_HEAD(hard_list); ++ struct yaffs_block_info *bi; ++ u32 seq_number; ++ int n_blocks = dev->internal_end_block - dev->internal_start_block + 1; ++ u8 *chunk_data; ++ int found_chunks; ++ int alloc_failed = 0; ++ struct yaffs_block_index *block_index = NULL; ++ int alt_block_index = 0; ++ int summary_available; ++ ++ yaffs_trace(YAFFS_TRACE_SCAN, ++ "yaffs2_scan_backwards starts intstartblk %d intendblk %d...", ++ dev->internal_start_block, dev->internal_end_block); ++ ++ dev->seq_number = YAFFS_LOWEST_SEQUENCE_NUMBER; ++ ++ block_index = ++ kmalloc(n_blocks * sizeof(struct yaffs_block_index), GFP_NOFS); ++ ++ if (!block_index) { ++ block_index = ++ vmalloc(n_blocks * sizeof(struct yaffs_block_index)); ++ alt_block_index = 1; ++ } ++ ++ if (!block_index) { ++ yaffs_trace(YAFFS_TRACE_SCAN, ++ "yaffs2_scan_backwards() could not allocate block index!" ++ ); ++ return YAFFS_FAIL; ++ } ++ ++ dev->blocks_in_checkpt = 0; ++ ++ chunk_data = yaffs_get_temp_buffer(dev); ++ ++ /* Scan all the blocks to determine their state */ ++ bi = dev->block_info; ++ for (blk = dev->internal_start_block; blk <= dev->internal_end_block; ++ blk++) { ++ yaffs_clear_chunk_bits(dev, blk); ++ bi->pages_in_use = 0; ++ bi->soft_del_pages = 0; ++ ++ yaffs_query_init_block_state(dev, blk, &state, &seq_number); ++ ++ bi->block_state = state; ++ bi->seq_number = seq_number; ++ ++ if (bi->seq_number == YAFFS_SEQUENCE_CHECKPOINT_DATA) ++ bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT; ++ if (bi->seq_number == YAFFS_SEQUENCE_BAD_BLOCK) ++ bi->block_state = YAFFS_BLOCK_STATE_DEAD; ++ ++ yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, ++ "Block scanning block %d state %d seq %d", ++ blk, bi->block_state, seq_number); ++ ++ if (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT) { ++ dev->blocks_in_checkpt++; ++ ++ } else if (bi->block_state == YAFFS_BLOCK_STATE_DEAD) { ++ yaffs_trace(YAFFS_TRACE_BAD_BLOCKS, ++ "block %d is bad", blk); ++ } else if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) { ++ yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, "Block empty "); ++ dev->n_erased_blocks++; ++ dev->n_free_chunks += dev->param.chunks_per_block; ++ } else if (bi->block_state == ++ YAFFS_BLOCK_STATE_NEEDS_SCAN) { ++ /* Determine the highest sequence number */ ++ if (seq_number >= YAFFS_LOWEST_SEQUENCE_NUMBER && ++ seq_number < YAFFS_HIGHEST_SEQUENCE_NUMBER) { ++ block_index[n_to_scan].seq = seq_number; ++ block_index[n_to_scan].block = blk; ++ n_to_scan++; ++ if (seq_number >= dev->seq_number) ++ dev->seq_number = seq_number; ++ } else { ++ /* TODO: Nasty sequence number! */ ++ yaffs_trace(YAFFS_TRACE_SCAN, ++ "Block scanning block %d has bad sequence number %d", ++ blk, seq_number); ++ } ++ } ++ bi++; ++ } ++ ++ yaffs_trace(YAFFS_TRACE_ALWAYS, "%d blocks to be sorted...", n_to_scan); ++ ++ cond_resched(); ++ ++ /* Sort the blocks by sequence number */ ++ sort(block_index, n_to_scan, sizeof(struct yaffs_block_index), ++ yaffs2_ybicmp, NULL); ++ ++ cond_resched(); ++ ++ yaffs_trace(YAFFS_TRACE_SCAN, "...done"); ++ ++ /* Now scan the blocks looking at the data. */ ++ start_iter = 0; ++ end_iter = n_to_scan - 1; ++ yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, "%d blocks to scan", n_to_scan); ++ ++ /* For each block.... backwards */ ++ for (block_iter = end_iter; ++ !alloc_failed && block_iter >= start_iter; ++ block_iter--) { ++ /* Cooperative multitasking! This loop can run for so ++ long that watchdog timers expire. */ ++ cond_resched(); ++ ++ /* get the block to scan in the correct order */ ++ blk = block_index[block_iter].block; ++ bi = yaffs_get_block_info(dev, blk); ++ deleted = 0; ++ ++ summary_available = yaffs_summary_read(dev, dev->sum_tags, blk); ++ ++ /* For each chunk in each block that needs scanning.... */ ++ found_chunks = 0; ++ if (summary_available) ++ c = dev->chunks_per_summary - 1; ++ else ++ c = dev->param.chunks_per_block - 1; ++ ++ for (/* c is already initialised */; ++ !alloc_failed && c >= 0 && ++ (bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN || ++ bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING); ++ c--) { ++ /* Scan backwards... ++ * Read the tags and decide what to do ++ */ ++ if (yaffs2_scan_chunk(dev, bi, blk, c, ++ &found_chunks, chunk_data, ++ &hard_list, summary_available) == ++ YAFFS_FAIL) ++ alloc_failed = 1; ++ } ++ ++ if (bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN) { ++ /* If we got this far while scanning, then the block ++ * is fully allocated. */ ++ bi->block_state = YAFFS_BLOCK_STATE_FULL; ++ } ++ ++ /* Now let's see if it was dirty */ ++ if (bi->pages_in_use == 0 && ++ !bi->has_shrink_hdr && ++ bi->block_state == YAFFS_BLOCK_STATE_FULL) { ++ yaffs_block_became_dirty(dev, blk); ++ } ++ } ++ ++ yaffs_skip_rest_of_block(dev); ++ ++ if (alt_block_index) ++ vfree(block_index); ++ else ++ kfree(block_index); ++ ++ /* Ok, we've done all the scanning. ++ * Fix up the hard link chains. ++ * We have scanned all the objects, now it's time to add these ++ * hardlinks. ++ */ ++ yaffs_link_fixup(dev, &hard_list); ++ ++ yaffs_release_temp_buffer(dev, chunk_data); ++ ++ if (alloc_failed) ++ return YAFFS_FAIL; ++ ++ yaffs_trace(YAFFS_TRACE_SCAN, "yaffs2_scan_backwards ends"); ++ ++ return YAFFS_OK; ++} +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yaffs_yaffs2.h linux-3.15-rc5/fs/yaffs2/yaffs_yaffs2.h +--- linux-3.15-rc5.orig/fs/yaffs2/yaffs_yaffs2.h 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yaffs_yaffs2.h 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,39 @@ ++/* ++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU Lesser General Public License version 2.1 as ++ * published by the Free Software Foundation. ++ * ++ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. ++ */ ++ ++#ifndef __YAFFS_YAFFS2_H__ ++#define __YAFFS_YAFFS2_H__ ++ ++#include "yaffs_guts.h" ++ ++void yaffs_calc_oldest_dirty_seq(struct yaffs_dev *dev); ++void yaffs2_find_oldest_dirty_seq(struct yaffs_dev *dev); ++void yaffs2_clear_oldest_dirty_seq(struct yaffs_dev *dev, ++ struct yaffs_block_info *bi); ++void yaffs2_update_oldest_dirty_seq(struct yaffs_dev *dev, unsigned block_no, ++ struct yaffs_block_info *bi); ++int yaffs_block_ok_for_gc(struct yaffs_dev *dev, struct yaffs_block_info *bi); ++u32 yaffs2_find_refresh_block(struct yaffs_dev *dev); ++int yaffs2_checkpt_required(struct yaffs_dev *dev); ++int yaffs_calc_checkpt_blocks_required(struct yaffs_dev *dev); ++ ++void yaffs2_checkpt_invalidate(struct yaffs_dev *dev); ++int yaffs2_checkpt_save(struct yaffs_dev *dev); ++int yaffs2_checkpt_restore(struct yaffs_dev *dev); ++ ++int yaffs2_handle_hole(struct yaffs_obj *obj, loff_t new_size); ++int yaffs2_scan_backwards(struct yaffs_dev *dev); ++ ++#endif +diff -Nur linux-3.15-rc5.orig/fs/yaffs2/yportenv.h linux-3.15-rc5/fs/yaffs2/yportenv.h +--- linux-3.15-rc5.orig/fs/yaffs2/yportenv.h 1970-01-01 01:00:00.000000000 +0100 ++++ linux-3.15-rc5/fs/yaffs2/yportenv.h 2014-05-17 01:53:27.000000000 +0200 +@@ -0,0 +1,85 @@ ++/* ++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. ++ * ++ * Copyright (C) 2002-2011 Aleph One Ltd. ++ * for Toby Churchill Ltd and Brightstar Engineering ++ * ++ * Created by Charles Manning <charles@aleph1.co.uk> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU Lesser General Public License version 2.1 as ++ * published by the Free Software Foundation. ++ * ++ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. ++ */ ++ ++#ifndef __YPORTENV_H__ ++#define __YPORTENV_H__ ++ ++/* ++ * Define the MTD version in terms of Linux Kernel versions ++ * This allows yaffs to be used independantly of the kernel ++ * as well as with it. ++ */ ++ ++#define MTD_VERSION(a, b, c) (((a) << 16) + ((b) << 8) + (c)) ++ ++#ifdef YAFFS_OUT_OF_TREE ++#include "moduleconfig.h" ++#endif ++ ++#include <linux/version.h> ++#define MTD_VERSION_CODE LINUX_VERSION_CODE ++ ++#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19)) ++#include <linux/config.h> ++#endif ++#include <linux/version.h> ++#include <linux/kernel.h> ++#include <linux/mm.h> ++#include <linux/sched.h> ++#include <linux/string.h> ++#include <linux/slab.h> ++#include <linux/vmalloc.h> ++#include <linux/xattr.h> ++#include <linux/list.h> ++#include <linux/types.h> ++#include <linux/fs.h> ++#include <linux/stat.h> ++#include <linux/sort.h> ++#include <linux/bitops.h> ++ ++/* These type wrappings are used to support Unicode names in WinCE. */ ++#define YCHAR char ++#define YUCHAR unsigned char ++#define _Y(x) x ++ ++#define YAFFS_LOSTNFOUND_NAME "lost+found" ++#define YAFFS_LOSTNFOUND_PREFIX "obj" ++ ++ ++#define YAFFS_ROOT_MODE 0755 ++#define YAFFS_LOSTNFOUND_MODE 0700 ++ ++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0)) ++#define Y_CURRENT_TIME CURRENT_TIME.tv_sec ++#define Y_TIME_CONVERT(x) (x).tv_sec ++#else ++#define Y_CURRENT_TIME CURRENT_TIME ++#define Y_TIME_CONVERT(x) (x) ++#endif ++ ++#define compile_time_assertion(assertion) \ ++ ({ int x = __builtin_choose_expr(assertion, 0, (void)0); (void) x; }) ++ ++ ++#define yaffs_printf(msk, fmt, ...) \ ++ printk(KERN_DEBUG "yaffs: " fmt "\n", ##__VA_ARGS__) ++ ++#define yaffs_trace(msk, fmt, ...) do { \ ++ if (yaffs_trace_mask & (msk)) \ ++ printk(KERN_DEBUG "yaffs: " fmt "\n", ##__VA_ARGS__); \ ++} while (0) ++ ++ ++#endif |