diff -Nur linux-2.6.32.orig/fs/Kconfig linux-2.6.32/fs/Kconfig
--- linux-2.6.32.orig/fs/Kconfig 2009-12-03 04:51:21.000000000 +0100
+++ linux-2.6.32/fs/Kconfig 2010-01-30 20:35:00.921899692 +0100
@@ -174,6 +174,10 @@
source "fs/befs/Kconfig"
source "fs/bfs/Kconfig"
source "fs/efs/Kconfig"
+
+# Patched by YAFFS
+source "fs/yaffs2/Kconfig"
+
source "fs/jffs2/Kconfig"
# UBIFS File system configuration
source "fs/ubifs/Kconfig"
diff -Nur linux-2.6.32.orig/fs/Makefile linux-2.6.32/fs/Makefile
--- linux-2.6.32.orig/fs/Makefile 2009-12-03 04:51:21.000000000 +0100
+++ linux-2.6.32/fs/Makefile 2010-01-30 20:35:00.933084814 +0100
@@ -124,3 +124,4 @@
obj-$(CONFIG_BTRFS_FS) += btrfs/
obj-$(CONFIG_GFS2_FS) += gfs2/
obj-$(CONFIG_EXOFS_FS) += exofs/
+obj-$(CONFIG_YAFFS_FS) += yaffs2/
diff -Nur linux-2.6.32.orig/fs/Makefile.pre.yaffs linux-2.6.32/fs/Makefile.pre.yaffs
--- linux-2.6.32.orig/fs/Makefile.pre.yaffs 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.32/fs/Makefile.pre.yaffs 2010-01-30 20:35:00.983076819 +0100
@@ -0,0 +1,126 @@
+#
+# Makefile for the Linux filesystems.
+#
+# 14 Sep 2000, Christoph Hellwig <hch@infradead.org>
+# Rewritten to use lists instead of if-statements.
+#
+
+obj-y := open.o read_write.o file_table.o super.o \
+ char_dev.o stat.o exec.o pipe.o namei.o fcntl.o \
+ ioctl.o readdir.o select.o fifo.o dcache.o inode.o \
+ attr.o bad_inode.o file.o filesystems.o namespace.o \
+ seq_file.o xattr.o libfs.o fs-writeback.o \
+ pnode.o drop_caches.o splice.o sync.o utimes.o \
+ stack.o
+
+ifeq ($(CONFIG_BLOCK),y)
+obj-y += buffer.o bio.o block_dev.o direct-io.o mpage.o ioprio.o
+else
+obj-y += no-block.o
+endif
+
+obj-$(CONFIG_BLK_DEV_INTEGRITY) += bio-integrity.o
+obj-y += notify/
+obj-$(CONFIG_EPOLL) += eventpoll.o
+obj-$(CONFIG_ANON_INODES) += anon_inodes.o
+obj-$(CONFIG_SIGNALFD) += signalfd.o
+obj-$(CONFIG_TIMERFD) += timerfd.o
+obj-$(CONFIG_EVENTFD) += eventfd.o
+obj-$(CONFIG_AIO) += aio.o
+obj-$(CONFIG_FILE_LOCKING) += locks.o
+obj-$(CONFIG_COMPAT) += compat.o compat_ioctl.o
+
+nfsd-$(CONFIG_NFSD) := nfsctl.o
+obj-y += $(nfsd-y) $(nfsd-m)
+
+obj-$(CONFIG_BINFMT_AOUT) += binfmt_aout.o
+obj-$(CONFIG_BINFMT_EM86) += binfmt_em86.o
+obj-$(CONFIG_BINFMT_MISC) += binfmt_misc.o
+
+# binfmt_script is always there
+obj-y += binfmt_script.o
+
+obj-$(CONFIG_BINFMT_ELF) += binfmt_elf.o
+obj-$(CONFIG_COMPAT_BINFMT_ELF) += compat_binfmt_elf.o
+obj-$(CONFIG_BINFMT_ELF_FDPIC) += binfmt_elf_fdpic.o
+obj-$(CONFIG_BINFMT_SOM) += binfmt_som.o
+obj-$(CONFIG_BINFMT_FLAT) += binfmt_flat.o
+
+obj-$(CONFIG_FS_MBCACHE) += mbcache.o
+obj-$(CONFIG_FS_POSIX_ACL) += posix_acl.o xattr_acl.o
+obj-$(CONFIG_NFS_COMMON) += nfs_common/
+obj-$(CONFIG_GENERIC_ACL) += generic_acl.o
+
+obj-$(CONFIG_QUOTA) += dquot.o
+obj-$(CONFIG_QFMT_V1) += quota_v1.o
+obj-$(CONFIG_QFMT_V2) += quota_v2.o
+obj-$(CONFIG_QUOTA_TREE) += quota_tree.o
+obj-$(CONFIG_QUOTACTL) += quota.o
+
+obj-$(CONFIG_PROC_FS) += proc/
+obj-y += partitions/
+obj-$(CONFIG_SYSFS) += sysfs/
+obj-$(CONFIG_CONFIGFS_FS) += configfs/
+obj-y += devpts/
+
+obj-$(CONFIG_PROFILING) += dcookies.o
+obj-$(CONFIG_DLM) += dlm/
+
+# Do not add any filesystems before this line
+obj-$(CONFIG_REISERFS_FS) += reiserfs/
+obj-$(CONFIG_EXT3_FS) += ext3/ # Before ext2 so root fs can be ext3
+obj-$(CONFIG_EXT2_FS) += ext2/
+# We place ext4 after ext2 so plain ext2 root fs's are mounted using ext2
+# unless explicitly requested by rootfstype
+obj-$(CONFIG_EXT4_FS) += ext4/
+obj-$(CONFIG_JBD) += jbd/
+obj-$(CONFIG_JBD2) += jbd2/
+obj-$(CONFIG_CRAMFS) += cramfs/
+obj-$(CONFIG_SQUASHFS) += squashfs/
+obj-y += ramfs/
+obj-$(CONFIG_HUGETLBFS) += hugetlbfs/
+obj-$(CONFIG_CODA_FS) += coda/
+obj-$(CONFIG_MINIX_FS) += minix/
+obj-$(CONFIG_FAT_FS) += fat/
+obj-$(CONFIG_BFS_FS) += bfs/
+obj-$(CONFIG_ISO9660_FS) += isofs/
+obj-$(CONFIG_HFSPLUS_FS) += hfsplus/ # Before hfs to find wrapped HFS+
+obj-$(CONFIG_HFS_FS) += hfs/
+obj-$(CONFIG_ECRYPT_FS) += ecryptfs/
+obj-$(CONFIG_VXFS_FS) += freevxfs/
+obj-$(CONFIG_NFS_FS) += nfs/
+obj-$(CONFIG_EXPORTFS) += exportfs/
+obj-$(CONFIG_NFSD) += nfsd/
+obj-$(CONFIG_LOCKD) += lockd/
+obj-$(CONFIG_NLS) += nls/
+obj-$(CONFIG_SYSV_FS) += sysv/
+obj-$(CONFIG_SMB_FS) += smbfs/
+obj-$(CONFIG_CIFS) += cifs/
+obj-$(CONFIG_NCP_FS) += ncpfs/
+obj-$(CONFIG_HPFS_FS) += hpfs/
+obj-$(CONFIG_NTFS_FS) += ntfs/
+obj-$(CONFIG_UFS_FS) += ufs/
+obj-$(CONFIG_EFS_FS) += efs/
+obj-$(CONFIG_JFFS2_FS) += jffs2/
+obj-$(CONFIG_UBIFS_FS) += ubifs/
+obj-$(CONFIG_AFFS_FS) += affs/
+obj-$(CONFIG_ROMFS_FS) += romfs/
+obj-$(CONFIG_QNX4FS_FS) += qnx4/
+obj-$(CONFIG_AUTOFS_FS) += autofs/
+obj-$(CONFIG_AUTOFS4_FS) += autofs4/
+obj-$(CONFIG_ADFS_FS) += adfs/
+obj-$(CONFIG_FUSE_FS) += fuse/
+obj-$(CONFIG_UDF_FS) += udf/
+obj-$(CONFIG_SUN_OPENPROMFS) += openpromfs/
+obj-$(CONFIG_OMFS_FS) += omfs/
+obj-$(CONFIG_JFS_FS) += jfs/
+obj-$(CONFIG_XFS_FS) += xfs/
+obj-$(CONFIG_9P_FS) += 9p/
+obj-$(CONFIG_AFS_FS) += afs/
+obj-$(CONFIG_BEFS_FS) += befs/
+obj-$(CONFIG_HOSTFS) += hostfs/
+obj-$(CONFIG_HPPFS) += hppfs/
+obj-$(CONFIG_DEBUG_FS) += debugfs/
+obj-$(CONFIG_OCFS2_FS) += ocfs2/
+obj-$(CONFIG_BTRFS_FS) += btrfs/
+obj-$(CONFIG_GFS2_FS) += gfs2/
diff -Nur linux-2.6.32.orig/fs/yaffs2/devextras.h linux-2.6.32/fs/yaffs2/devextras.h
--- linux-2.6.32.orig/fs/yaffs2/devextras.h 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.32/fs/yaffs2/devextras.h 2010-01-30 20:35:01.021829008 +0100
@@ -0,0 +1,196 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2007 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 file is just holds extra declarations of macros that would normally
+ * be providesd in the Linux kernel. These macros have been written from
+ * scratch but are functionally equivalent to the Linux ones.
+ *
+ */
+
+#ifndef __EXTRAS_H__
+#define __EXTRAS_H__
+
+
+#if !(defined __KERNEL__)
+
+/* Definition of types */
+typedef unsigned char __u8;
+typedef unsigned short __u16;
+typedef unsigned __u32;
+
+#endif
+
+/*
+ * This is a simple doubly linked list implementation that matches the
+ * way the Linux kernel doubly linked list implementation works.
+ */
+
+struct ylist_head {
+ struct ylist_head *next; /* next in chain */
+ struct ylist_head *prev; /* previous in chain */
+};
+
+
+/* Initialise a static list */
+#define YLIST_HEAD(name) \
+struct ylist_head name = { &(name), &(name)}
+
+
+
+/* Initialise a list head to an empty list */
+#define YINIT_LIST_HEAD(p) \
+do { \
+ (p)->next = (p);\
+ (p)->prev = (p); \
+} while (0)
+
+
+/* Add an element to a list */
+static __inline__ void ylist_add(struct ylist_head *newEntry,
+ struct ylist_head *list)
+{
+ struct ylist_head *listNext = list->next;
+
+ list->next = newEntry;
+ newEntry->prev = list;
+ newEntry->next = listNext;
+ listNext->prev = newEntry;
+
+}
+
+static __inline__ void ylist_add_tail(struct ylist_head *newEntry,
+ struct ylist_head *list)
+{
+ struct ylist_head *listPrev = list->prev;
+
+ list->prev = newEntry;
+ newEntry->next = list;
+ newEntry->prev = listPrev;
+ listPrev->next = newEntry;
+
+}
+
+
+/* Take an element out of its current list, with or without
+ * reinitialising the links.of the entry*/
+static __inline__ void ylist_del(struct ylist_head *entry)
+{
+ struct ylist_head *listNext = entry->next;
+ struct ylist_head *listPrev = entry->prev;
+
+ listNext->prev = listPrev;
+ listPrev->next = listNext;
+
+}
+
+static __inline__ void ylist_del_init(struct ylist_head *entry)
+{
+ ylist_del(entry);
+ entry->next = entry->prev = entry;
+}
+
+
+/* Test if the list is empty */
+static __inline__ int ylist_empty(struct ylist_head *entry)
+{
+ return (entry->next == entry);
+}
+
+
+/* ylist_entry takes a pointer to a list entry and offsets it to that
+ * we can find a pointer to the object it is embedded in.
+ */
+
+
+#define ylist_entry(entry, type, member) \
+ ((type *)((char *)(entry)-(unsigned long)(&((type *)NULL)->member)))
+
+
+/* ylist_for_each and list_for_each_safe iterate over lists.
+ * ylist_for_each_safe uses temporary storage to make the list delete safe
+ */
+
+#define ylist_for_each(itervar, list) \
+ for (itervar = (list)->next; itervar != (list); itervar = itervar->next)
+
+#define ylist_for_each_safe(itervar, saveVar, list) \
+ for (itervar = (list)->next, saveVar = (list)->next->next; \
+ itervar != (list); itervar = saveVar, saveVar = saveVar->next)
+
+
+#if !(defined __KERNEL__)
+
+
+#ifndef WIN32
+#include <sys/stat.h>
+#endif
+
+
+#ifdef CONFIG_YAFFS_PROVIDE_DEFS
+/* File types */
+
+
+#define DT_UNKNOWN 0
+#define DT_FIFO 1
+#define DT_CHR 2
+#define DT_DIR 4
+#define DT_BLK 6
+#define DT_REG 8
+#define DT_LNK 10
+#define DT_SOCK 12
+#define DT_WHT 14
+
+
+#ifndef WIN32
+#include <sys/stat.h>
+#endif
+
+/*
+ * Attribute flags. These should be or-ed together to figure out what
+ * has been changed!
+ */
+#define ATTR_MODE 1
+#define ATTR_UID 2
+#define ATTR_GID 4
+#define ATTR_SIZE 8
+#define ATTR_ATIME 16
+#define ATTR_MTIME 32
+#define ATTR_CTIME 64
+
+struct iattr {
+ unsigned int ia_valid;
+ unsigned ia_mode;
+ unsigned ia_uid;
+ unsigned ia_gid;
+ unsigned ia_size;
+ unsigned ia_atime;
+ unsigned ia_mtime;
+ unsigned ia_ctime;
+ unsigned int ia_attr_flags;
+};
+
+#endif
+
+#else
+
+#include <linux/types.h>
+#include <linux/fs.h>
+#include <linux/stat.h>
+
+#endif
+
+
+#endif
diff -Nur linux-2.6.32.orig/fs/yaffs2/Kconfig linux-2.6.32/fs/yaffs2/Kconfig
--- linux-2.6.32.orig/fs/yaffs2/Kconfig 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.32/fs/yaffs2/Kconfig 2010-01-30 20:35:01.053081300 +0100
@@ -0,0 +1,156 @@
+#
+# 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 Filing System, is a filing 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_LAZY_LOAD
+ bool "Disable lazy loading"
+ depends on YAFFS_YAFFS2
+ default n
+ help
+ "Lazy loading" defers loading file details until they are
+ required. This saves mount time, but makes the first look-up
+ a bit longer.
+
+ Lazy loading will only happen if enabled by this option being 'n'
+ and if the appropriate tags are available, else yaffs2 will
+ automatically fall back to immediate loading and do the right
+ thing.
+
+ Lazy laoding will be required by checkpointing.
+
+ Setting this to 'y' will disable lazy loading.
+
+ If unsure, say N.
+
+
+config YAFFS_DISABLE_WIDE_TNODES
+ bool "Turn off wide tnodes"
+ depends on YAFFS_FS
+ default n
+ help
+ Wide tnodes are only used for NAND arrays >=32MB for 512-byte
+ page devices and >=128MB for 2k page devices. They use slightly
+ more RAM but are faster since they eliminate chunk group
+ searching.
+
+ Setting this to 'y' will force tnode width to 16 bits and save
+ memory but make large arrays slower.
+
+ 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_SHORT_NAMES_IN_RAM
+ bool "Cache short names in RAM"
+ depends on YAFFS_FS
+ default y
+ help
+ If this config is set, then short names are stored with the
+ yaffs_Object. This costs an extra 16 bytes of RAM per object,
+ but makes look-ups faster.
+
+ If unsure, say Y.
diff -Nur linux-2.6.32.orig/fs/yaffs2/Makefile linux-2.6.32/fs/yaffs2/Makefile
--- linux-2.6.32.orig/fs/yaffs2/Makefile 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.32/fs/yaffs2/Makefile 2010-01-30 20:35:01.093074881 +0100
@@ -0,0 +1,10 @@
+#
+# Makefile for the linux YAFFS filesystem routines.
+#
+
+obj-$(CONFIG_YAFFS_FS) += yaffs.o
+
+yaffs-y := yaffs_ecc.o yaffs_fs.o yaffs_guts.o yaffs_checkptrw.o
+yaffs-y += yaffs_packedtags1.o yaffs_packedtags2.o yaffs_nand.o yaffs_qsort.o
+yaffs-y += yaffs_tagscompat.o yaffs_tagsvalidity.o
+yaffs-y += yaffs_mtdif.o yaffs_mtdif1.o yaffs_mtdif2.o
diff -Nur linux-2.6.32.orig/fs/yaffs2/moduleconfig.h linux-2.6.32/fs/yaffs2/moduleconfig.h
--- linux-2.6.32.orig/fs/yaffs2/moduleconfig.h 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.32/fs/yaffs2/moduleconfig.h 2010-01-30 20:35:01.131828051 +0100
@@ -0,0 +1,65 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ * for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Martin Fouts <Martin.Fouts@palmsource.com>
+ *
+ * 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_CONFIG_H__
+#define __YAFFS_CONFIG_H__
+
+#ifdef YAFFS_OUT_OF_TREE
+
+/* DO NOT UNSET THESE THREE. YAFFS2 will not compile if you do. */
+#define CONFIG_YAFFS_FS
+#define CONFIG_YAFFS_YAFFS1
+#define CONFIG_YAFFS_YAFFS2
+
+/* These options are independent of each other. Select those that matter. */
+
+/* Default: Not selected */
+/* Meaning: Yaffs does its own ECC, rather than using MTD ECC */
+/* #define CONFIG_YAFFS_DOES_ECC */
+
+/* Default: Not selected */
+/* Meaning: ECC byte order is 'wrong'. Only meaningful if */
+/* CONFIG_YAFFS_DOES_ECC is set */
+/* #define CONFIG_YAFFS_ECC_WRONG_ORDER */
+
+/* Default: Selected */
+/* Meaning: Disables testing whether chunks are erased before writing to them*/
+#define CONFIG_YAFFS_DISABLE_CHUNK_ERASED_CHECK
+
+/* Default: Selected */
+/* Meaning: Cache short names, taking more RAM, but faster look-ups */
+#define CONFIG_YAFFS_SHORT_NAMES_IN_RAM
+
+/* Default: 10 */
+/* Meaning: set the count of blocks to reserve for checkpointing */
+#define CONFIG_YAFFS_CHECKPOINT_RESERVED_BLOCKS 10
+
+/*
+Older-style on-NAND data format has a "pageStatus" byte to record
+chunk/page state. This byte is zeroed when the page is discarded.
+Choose this option if you have existing on-NAND data in 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.
+*/
+/* Default: Not selected */
+/* Meaning: Use older-style on-NAND data format with pageStatus byte */
+/* #define CONFIG_YAFFS_9BYTE_TAGS */
+
+#endif /* YAFFS_OUT_OF_TREE */
+
+#endif /* __YAFFS_CONFIG_H__ */
diff -Nur linux-2.6.32.orig/fs/yaffs2/yaffs_checkptrw.c linux-2.6.32/fs/yaffs2/yaffs_checkptrw.c
--- linux-2.6.32.orig/fs/yaffs2/yaffs_checkptrw.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.32/fs/yaffs2/yaffs_checkptrw.c 2010-01-30 20:35:01.171829690 +0100
@@ -0,0 +1,394 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2007 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.
+ */
+
+const char *yaffs_checkptrw_c_version =
+ "$Id: yaffs_checkptrw.c,v 1.18 2009-03-06 17:20:49 wookey Exp $";
+
+
+#include "yaffs_checkptrw.h"
+#include "yaffs_getblockinfo.h"
+
+static int yaffs_CheckpointSpaceOk(yaffs_Device *dev)
+{
+ int blocksAvailable = dev->nErasedBlocks - dev->nReservedBlocks;
+
+ T(YAFFS_TRACE_CHECKPOINT,
+ (TSTR("checkpt blocks available = %d" TENDSTR),
+ blocksAvailable));
+
+ return (blocksAvailable <= 0) ? 0 : 1;
+}
+
+
+static int yaffs_CheckpointErase(yaffs_Device *dev)
+{
+ int i;
+
+ if (!dev->eraseBlockInNAND)
+ return 0;
+ T(YAFFS_TRACE_CHECKPOINT, (TSTR("checking blocks %d to %d"TENDSTR),
+ dev->internalStartBlock, dev->internalEndBlock));
+
+ for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
+ yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, i);
+ if (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT) {
+ T(YAFFS_TRACE_CHECKPOINT, (TSTR("erasing checkpt block %d"TENDSTR), i));
+ if (dev->eraseBlockInNAND(dev, i - dev->blockOffset /* realign */)) {
+ bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
+ dev->nErasedBlocks++;
+ dev->nFreeChunks += dev->nChunksPerBlock;
+ } else {
+ dev->markNANDBlockBad(dev, i);
+ bi->blockState = YAFFS_BLOCK_STATE_DEAD;
+ }
+ }
+ }
+
+ dev->blocksInCheckpoint = 0;
+
+ return 1;
+}
+
+
+static void yaffs_CheckpointFindNextErasedBlock(yaffs_Device *dev)
+{
+ int i;
+ int blocksAvailable = dev->nErasedBlocks - dev->nReservedBlocks;
+ T(YAFFS_TRACE_CHECKPOINT,
+ (TSTR("allocating checkpt block: erased %d reserved %d avail %d next %d "TENDSTR),
+ dev->nErasedBlocks, dev->nReservedBlocks, blocksAvailable, dev->checkpointNextBlock));
+
+ if (dev->checkpointNextBlock >= 0 &&
+ dev->checkpointNextBlock <= dev->internalEndBlock &&
+ blocksAvailable > 0) {
+
+ for (i = dev->checkpointNextBlock; i <= dev->internalEndBlock; i++) {
+ yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, i);
+ if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
+ dev->checkpointNextBlock = i + 1;
+ dev->checkpointCurrentBlock = i;
+ T(YAFFS_TRACE_CHECKPOINT, (TSTR("allocating checkpt block %d"TENDSTR), i));
+ return;
+ }
+ }
+ }
+ T(YAFFS_TRACE_CHECKPOINT, (TSTR("out of checkpt blocks"TENDSTR)));
+
+ dev->checkpointNextBlock = -1;
+ dev->checkpointCurrentBlock = -1;
+}
+
+static void yaffs_CheckpointFindNextCheckpointBlock(yaffs_Device *dev)
+{
+ int i;
+ yaffs_ExtendedTags tags;
+
+ T(YAFFS_TRACE_CHECKPOINT, (TSTR("find next checkpt block: start: blocks %d next %d" TENDSTR),
+ dev->blocksInCheckpoint, dev->checkpointNextBlock));
+
+ if (dev->blocksInCheckpoint < dev->checkpointMaxBlocks)
+ for (i = dev->checkpointNextBlock; i <= dev->internalEndBlock; i++) {
+ int chunk = i * dev->nChunksPerBlock;
+ int realignedChunk = chunk - dev->chunkOffset;
+
+ dev->readChunkWithTagsFromNAND(dev, realignedChunk,
+ NULL, &tags);
+ T(YAFFS_TRACE_CHECKPOINT, (TSTR("find next checkpt block: search: block %d oid %d seq %d eccr %d" TENDSTR),
+ i, tags.objectId, tags.sequenceNumber, tags.eccResult));
+
+ if (tags.sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA) {
+ /* Right kind of block */
+ dev->checkpointNextBlock = tags.objectId;
+ dev->checkpointCurrentBlock = i;
+ dev->checkpointBlockList[dev->blocksInCheckpoint] = i;
+ dev->blocksInCheckpoint++;
+ T(YAFFS_TRACE_CHECKPOINT, (TSTR("found checkpt block %d"TENDSTR), i));
+ return;
+ }
+ }
+
+ T(YAFFS_TRACE_CHECKPOINT, (TSTR("found no more checkpt blocks"TENDSTR)));
+
+ dev->checkpointNextBlock = -1;
+ dev->checkpointCurrentBlock = -1;
+}
+
+
+int yaffs_CheckpointOpen(yaffs_Device *dev, int forWriting)
+{
+
+ /* Got the functions we need? */
+ if (!dev->writeChunkWithTagsToNAND ||
+ !dev->readChunkWithTagsFromNAND ||
+ !dev->eraseBlockInNAND ||
+ !dev->markNANDBlockBad)
+ return 0;
+
+ if (forWriting && !yaffs_CheckpointSpaceOk(dev))
+ return 0;
+
+ if (!dev->checkpointBuffer)
+ dev->checkpointBuffer = YMALLOC_DMA(dev->totalBytesPerChunk);
+ if (!dev->checkpointBuffer)
+ return 0;
+
+
+ dev->checkpointPageSequence = 0;
+
+ dev->checkpointOpenForWrite = forWriting;
+
+ dev->checkpointByteCount = 0;
+ dev->checkpointSum = 0;
+ dev->checkpointXor = 0;
+ dev->checkpointCurrentBlock = -1;
+ dev->checkpointCurrentChunk = -1;
+ dev->checkpointNextBlock = dev->internalStartBlock;
+
+ /* Erase all the blocks in the checkpoint area */
+ if (forWriting) {
+ memset(dev->checkpointBuffer, 0, dev->nDataBytesPerChunk);
+ dev->checkpointByteOffset = 0;
+ return yaffs_CheckpointErase(dev);
+ } else {
+ int i;
+ /* Set to a value that will kick off a read */
+ dev->checkpointByteOffset = dev->nDataBytesPerChunk;
+ /* A checkpoint block list of 1 checkpoint block per 16 block is (hopefully)
+ * going to be way more than we need */
+ dev->blocksInCheckpoint = 0;
+ dev->checkpointMaxBlocks = (dev->internalEndBlock - dev->internalStartBlock)/16 + 2;
+ dev->checkpointBlockList = YMALLOC(sizeof(int) * dev->checkpointMaxBlocks);
+ for (i = 0; i < dev->checkpointMaxBlocks; i++)
+ dev->checkpointBlockList[i] = -1;
+ }
+
+ return 1;
+}
+
+int yaffs_GetCheckpointSum(yaffs_Device *dev, __u32 *sum)
+{
+ __u32 compositeSum;
+ compositeSum = (dev->checkpointSum << 8) | (dev->checkpointXor & 0xFF);
+ *sum = compositeSum;
+ return 1;
+}
+
+static int yaffs_CheckpointFlushBuffer(yaffs_Device *dev)
+{
+ int chunk;
+ int realignedChunk;
+
+ yaffs_ExtendedTags tags;
+
+ if (dev->checkpointCurrentBlock < 0) {
+ yaffs_CheckpointFindNextErasedBlock(dev);
+ dev->checkpointCurrentChunk = 0;
+ }
+
+ if (dev->checkpointCurrentBlock < 0)
+ return 0;
+
+ tags.chunkDeleted = 0;
+ tags.objectId = dev->checkpointNextBlock; /* Hint to next place to look */
+ tags.chunkId = dev->checkpointPageSequence + 1;
+ tags.sequenceNumber = YAFFS_SEQUENCE_CHECKPOINT_DATA;
+ tags.byteCount = dev->nDataBytesPerChunk;
+ if (dev->checkpointCurrentChunk == 0) {
+ /* First chunk we write for the block? Set block state to
+ checkpoint */
+ yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, dev->checkpointCurrentBlock);
+ bi->blockState = YAFFS_BLOCK_STATE_CHECKPOINT;
+ dev->blocksInCheckpoint++;
+ }
+
+ chunk = dev->checkpointCurrentBlock * dev->nChunksPerBlock + dev->checkpointCurrentChunk;
+
+
+ T(YAFFS_TRACE_CHECKPOINT, (TSTR("checkpoint wite buffer nand %d(%d:%d) objid %d chId %d" TENDSTR),
+ chunk, dev->checkpointCurrentBlock, dev->checkpointCurrentChunk, tags.objectId, tags.chunkId));
+
+ realignedChunk = chunk - dev->chunkOffset;
+
+ dev->writeChunkWithTagsToNAND(dev, realignedChunk,
+ dev->checkpointBuffer, &tags);
+ dev->checkpointByteOffset = 0;
+ dev->checkpointPageSequence++;
+ dev->checkpointCurrentChunk++;
+ if (dev->checkpointCurrentChunk >= dev->nChunksPerBlock) {
+ dev->checkpointCurrentChunk = 0;
+ dev->checkpointCurrentBlock = -1;
+ }
+ memset(dev->checkpointBuffer, 0, dev->nDataBytesPerChunk);
+
+ return 1;
+}
+
+
+int yaffs_CheckpointWrite(yaffs_Device *dev, const void *data, int nBytes)
+{
+ int i = 0;
+ int ok = 1;
+
+
+ __u8 * dataBytes = (__u8 *)data;
+
+
+
+ if (!dev->checkpointBuffer)
+ return 0;
+
+ if (!dev->checkpointOpenForWrite)
+ return -1;
+
+ while (i < nBytes && ok) {
+ dev->checkpointBuffer[dev->checkpointByteOffset] = *dataBytes;
+ dev->checkpointSum += *dataBytes;
+ dev->checkpointXor ^= *dataBytes;
+
+ dev->checkpointByteOffset++;
+ i++;
+ dataBytes++;
+ dev->checkpointByteCount++;
+
+
+ if (dev->checkpointByteOffset < 0 ||
+ dev->checkpointByteOffset >= dev->nDataBytesPerChunk)
+ ok = yaffs_CheckpointFlushBuffer(dev);
+ }
+
+ return i;
+}
+
+int yaffs_CheckpointRead(yaffs_Device *dev, void *data, int nBytes)
+{
+ int i = 0;
+ int ok = 1;
+ yaffs_ExtendedTags tags;
+
+
+ int chunk;
+ int realignedChunk;
+
+ __u8 *dataBytes = (__u8 *)data;
+
+ if (!dev->checkpointBuffer)
+ return 0;
+
+ if (dev->checkpointOpenForWrite)
+ return -1;
+
+ while (i < nBytes && ok) {
+
+
+ if (dev->checkpointByteOffset < 0 ||
+ dev->checkpointByteOffset >= dev->nDataBytesPerChunk) {
+
+ if (dev->checkpointCurrentBlock < 0) {
+ yaffs_CheckpointFindNextCheckpointBlock(dev);
+ dev->checkpointCurrentChunk = 0;
+ }
+
+ if (dev->checkpointCurrentBlock < 0)
+ ok = 0;
+ else {
+ chunk = dev->checkpointCurrentBlock *
+ dev->nChunksPerBlock +
+ dev->checkpointCurrentChunk;
+
+ realignedChunk = chunk - dev->chunkOffset;
+
+ /* read in the next chunk */
+ /* printf("read checkpoint page %d\n",dev->checkpointPage); */
+ dev->readChunkWithTagsFromNAND(dev,
+ realignedChunk,
+ dev->checkpointBuffer,
+ &tags);
+
+ if (tags.chunkId != (dev->checkpointPageSequence + 1) ||
+ tags.eccResult > YAFFS_ECC_RESULT_FIXED ||
+ tags.sequenceNumber != YAFFS_SEQUENCE_CHECKPOINT_DATA)
+ ok = 0;
+
+ dev->checkpointByteOffset = 0;
+ dev->checkpointPageSequence++;
+ dev->checkpointCurrentChunk++;
+
+ if (dev->checkpointCurrentChunk >= dev->nChunksPerBlock)
+ dev->checkpointCurrentBlock = -1;
+ }
+ }
+
+ if (ok) {
+ *dataBytes = dev->checkpointBuffer[dev->checkpointByteOffset];
+ dev->checkpointSum += *dataBytes;
+ dev->checkpointXor ^= *dataBytes;
+ dev->checkpointByteOffset++;
+ i++;
+ dataBytes++;
+ dev->checkpointByteCount++;
+ }
+ }
+
+ return i;
+}
+
+int yaffs_CheckpointClose(yaffs_Device *dev)
+{
+
+ if (dev->checkpointOpenForWrite) {
+ if (dev->checkpointByteOffset != 0)
+ yaffs_CheckpointFlushBuffer(dev);
+ } else {
+ int i;
+ for (i = 0; i < dev->blocksInCheckpoint && dev->checkpointBlockList[i] >= 0; i++) {
+ yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, dev->checkpointBlockList[i]);
+ if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY)
+ bi->blockState = YAFFS_BLOCK_STATE_CHECKPOINT;
+ else {
+ /* Todo this looks odd... */
+ }
+ }
+ YFREE(dev->checkpointBlockList);
+ dev->checkpointBlockList = NULL;
+ }
+
+ dev->nFreeChunks -= dev->blocksInCheckpoint * dev->nChunksPerBlock;
+ dev->nErasedBlocks -= dev->blocksInCheckpoint;
+
+
+ T(YAFFS_TRACE_CHECKPOINT, (TSTR("checkpoint byte count %d" TENDSTR),
+ dev->checkpointByteCount));
+
+ if (dev->checkpointBuffer) {
+ /* free the buffer */
+ YFREE(dev->checkpointBuffer);
+ dev->checkpointBuffer = NULL;
+ return 1;
+ } else
+ return 0;
+}
+
+int yaffs_CheckpointInvalidateStream(yaffs_Device *dev)
+{
+ /* Erase the first checksum block */
+
+ T(YAFFS_TRACE_CHECKPOINT, (TSTR("checkpoint invalidate"TENDSTR)));
+
+ if (!yaffs_CheckpointSpaceOk(dev))
+ return 0;
+
+ return yaffs_CheckpointErase(dev);
+}
+
+
+
diff -Nur linux-2.6.32.orig/fs/yaffs2/yaffs_checkptrw.h linux-2.6.32/fs/yaffs2/yaffs_checkptrw.h
--- linux-2.6.32.orig/fs/yaffs2/yaffs_checkptrw.h 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.32/fs/yaffs2/yaffs_checkptrw.h 2010-01-30 20:35:01.213084831 +0100
@@ -0,0 +1,35 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2007 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 yaffs_CheckpointOpen(yaffs_Device *dev, int forWriting);
+
+int yaffs_CheckpointWrite(yaffs_Device *dev, const void *data, int nBytes);
+
+int yaffs_CheckpointRead(yaffs_Device *dev, void *data, int nBytes);
+
+int yaffs_GetCheckpointSum(yaffs_Device *dev, __u32 *sum);
+
+int yaffs_CheckpointClose(yaffs_Device *dev);
+
+int yaffs_CheckpointInvalidateStream(yaffs_Device *dev);
+
+
+#endif
+
diff -Nur linux-2.6.32.orig/fs/yaffs2/yaffs_ecc.c linux-2.6.32/fs/yaffs2/yaffs_ecc.c
--- linux-2.6.32.orig/fs/yaffs2/yaffs_ecc.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.32/fs/yaffs2/yaffs_ecc.c 2010-01-30 20:35:01.251829837 +0100
@@ -0,0 +1,326 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2007 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.
+ *
+ */
+
+/* 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.
+ */
+
+const char *yaffs_ecc_c_version =
+ "$Id: yaffs_ecc.c,v 1.11 2009-03-06 17:20:50 wookey Exp $";
+
+#include "yportenv.h"
+
+#include "yaffs_ecc.h"
+
+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,
+};
+
+/* Count the bits in an unsigned char or a U32 */
+
+static int yaffs_CountBits(unsigned char x)
+{
+ int r = 0;
+ while (x) {
+ if (x & 1)
+ r++;
+ x >>= 1;
+ }
+ return r;
+}
+
+static int yaffs_CountBits32(unsigned x)
+{
+ int r = 0;
+ while (x) {
+ if (x & 1)
+ r++;
+ x >>= 1;
+ }
+ return r;
+}
+
+/* Calculate the ECC for a 256-byte block of data */
+void yaffs_ECCCalculate(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;
+
+#ifdef CONFIG_YAFFS_ECC_WRONG_ORDER
+ /* Swap the bytes into the wrong order */
+ t = ecc[0];
+ ecc[0] = ecc[1];
+ ecc[1] = t;
+#endif
+}
+
+
+/* Correct the ECC on a 256 byte block of data */
+
+int yaffs_ECCCorrect(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;
+
+#ifdef CONFIG_YAFFS_ECC_WRONG_ORDER
+ /* swap the bytes to correct for the wrong order */
+ unsigned char t;
+
+ t = d0;
+ d0 = d1;
+ d1 = t;
+#endif
+
+ 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 ((yaffs_CountBits(d0) +
+ yaffs_CountBits(d1) +
+ yaffs_CountBits(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_ECCCalculateOther(const unsigned char *data, unsigned nBytes,
+ yaffs_ECCOther *eccOther)
+{
+ unsigned int i;
+
+ unsigned char col_parity = 0;
+ unsigned line_parity = 0;
+ unsigned line_parity_prime = 0;
+ unsigned char b;
+
+ for (i = 0; i < nBytes; 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;
+ }
+
+ }
+
+ eccOther->colParity = (col_parity >> 2) & 0x3f;
+ eccOther->lineParity = line_parity;
+ eccOther->lineParityPrime = line_parity_prime;
+}
+
+int yaffs_ECCCorrectOther(unsigned char *data, unsigned nBytes,
+ yaffs_ECCOther *read_ecc,
+ const yaffs_ECCOther *test_ecc)
+{
+ unsigned char cDelta; /* column parity delta */
+ unsigned lDelta; /* line parity delta */
+ unsigned lDeltaPrime; /* line parity delta */
+ unsigned bit;
+
+ cDelta = read_ecc->colParity ^ test_ecc->colParity;
+ lDelta = read_ecc->lineParity ^ test_ecc->lineParity;
+ lDeltaPrime = read_ecc->lineParityPrime ^ test_ecc->lineParityPrime;
+
+ if ((cDelta | lDelta | lDeltaPrime) == 0)
+ return 0; /* no error */
+
+ if (lDelta == ~lDeltaPrime &&
+ (((cDelta ^ (cDelta >> 1)) & 0x15) == 0x15)) {
+ /* Single bit (recoverable) error in data */
+
+ bit = 0;
+
+ if (cDelta & 0x20)
+ bit |= 0x04;
+ if (cDelta & 0x08)
+ bit |= 0x02;
+ if (cDelta & 0x02)
+ bit |= 0x01;
+
+ if (lDelta >= nBytes)
+ return -1;
+
+ data[lDelta] ^= (1 << bit);
+
+ return 1; /* corrected */
+ }
+
+ if ((yaffs_CountBits32(lDelta) + yaffs_CountBits32(lDeltaPrime) +
+ yaffs_CountBits(cDelta)) == 1) {
+ /* Reccoverable error in ecc */
+
+ *read_ecc = *test_ecc;
+ return 1; /* corrected */
+ }
+
+ /* Unrecoverable error */
+
+ return -1;
+}
diff -Nur linux-2.6.32.orig/fs/yaffs2/yaffs_ecc.h linux-2.6.32/fs/yaffs2/yaffs_ecc.h
--- linux-2.6.32.orig/fs/yaffs2/yaffs_ecc.h 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.32/fs/yaffs2/yaffs_ecc.h 2010-01-30 20:35:01.292693842 +0100
@@ -0,0 +1,44 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2007 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__
+
+typedef struct {
+ unsigned char colParity;
+ unsigned lineParity;
+ unsigned lineParityPrime;
+} yaffs_ECCOther;
+
+void yaffs_ECCCalculate(const unsigned char *data, unsigned char *ecc);
+int yaffs_ECCCorrect(unsigned char *data, unsigned char *read_ecc,
+ const unsigned char *test_ecc);
+
+void yaffs_ECCCalculateOther(const unsigned char *data, unsigned nBytes,
+ yaffs_ECCOther *ecc);
+int yaffs_ECCCorrectOther(unsigned char *data, unsigned nBytes,
+ yaffs_ECCOther *read_ecc,
+ const yaffs_ECCOther *test_ecc);
+#endif
diff -Nur linux-2.6.32.orig/fs/yaffs2/yaffs_fs.c linux-2.6.32/fs/yaffs2/yaffs_fs.c
--- linux-2.6.32.orig/fs/yaffs2/yaffs_fs.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.32/fs/yaffs2/yaffs_fs.c 2010-01-30 20:35:01.331845579 +0100
@@ -0,0 +1,2529 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2009 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 yaffs_Device associated with
+ * this superblock
+ * >> 2.6: sb->s_fs_info points to the yaffs_Device associated with this
+ * superblock
+ * >> inode->u.generic_ip points to the associated yaffs_Object.
+ */
+
+const char *yaffs_fs_c_version =
+ "$Id: yaffs_fs.c,v 1.79 2009-03-17 01:12:00 wookey Exp $";
+extern const char *yaffs_guts_c_version;
+
+#include <linux/version.h>
+#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>
+#include <linux/smp_lock.h>
+#include <linux/pagemap.h>
+#include <linux/mtd/mtd.h>
+#include <linux/interrupt.h>
+#include <linux/string.h>
+#include <linux/ctype.h>
+
+#include "asm/div64.h"
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+
+#include <linux/statfs.h> /* Added NCB 15-8-2003 */
+#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, 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
+
+#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(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 "yportenv.h"
+#include "yaffs_guts.h"
+
+#include <linux/mtd/mtd.h>
+#include "yaffs_mtdif.h"
+#include "yaffs_mtdif1.h"
+#include "yaffs_mtdif2.h"
+
+unsigned int yaffs_traceMask = YAFFS_TRACE_BAD_BLOCKS;
+unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
+unsigned int yaffs_auto_checkpoint = 1;
+
+/* Module Parameters */
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+module_param(yaffs_traceMask, uint, 0644);
+module_param(yaffs_wr_attempts, uint, 0644);
+module_param(yaffs_auto_checkpoint, uint, 0644);
+#else
+MODULE_PARM(yaffs_traceMask, "i");
+MODULE_PARM(yaffs_wr_attempts, "i");
+MODULE_PARM(yaffs_auto_checkpoint, "i");
+#endif
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25))
+/* use iget and read_inode */
+#define Y_IGET(sb, inum) iget((sb), (inum))
+static void yaffs_read_inode(struct inode *inode);
+
+#else
+/* Call local equivalent */
+#define YAFFS_USE_OWN_IGET
+#define Y_IGET(sb, inum) yaffs_iget((sb), (inum))
+
+static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino);
+#endif
+
+/*#define T(x) printk x */
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
+#define yaffs_InodeToObjectLV(iptr) ((iptr)->i_private)
+#else
+#define yaffs_InodeToObjectLV(iptr) ((iptr)->u.generic_ip)
+#endif
+
+#define yaffs_InodeToObject(iptr) ((yaffs_Object *)(yaffs_InodeToObjectLV(iptr)))
+#define yaffs_DentryToObject(dptr) yaffs_InodeToObject((dptr)->d_inode)
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+#define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->s_fs_info)
+#else
+#define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->u.generic_sbp)
+#endif
+
+static void yaffs_put_super(struct super_block *sb);
+
+static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
+ loff_t *pos);
+static ssize_t yaffs_hold_space(struct file *f);
+static void yaffs_release_space(struct file *f);
+
+#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
+
+static int yaffs_sync_object(struct file *file, struct dentry *dentry,
+ int datasync);
+
+static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
+ struct nameidata *n);
+static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
+ struct nameidata *n);
+#else
+static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
+static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry);
+#endif
+static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
+ struct dentry *dentry);
+static int yaffs_unlink(struct inode *dir, struct dentry *dentry);
+static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
+ const char *symname);
+static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
+ dev_t dev);
+#else
+static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
+ int dev);
+#endif
+static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
+ struct inode *new_dir, struct dentry *new_dentry);
+static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static int yaffs_sync_fs(struct super_block *sb, int wait);
+static void yaffs_write_super(struct super_block *sb);
+#else
+static int yaffs_sync_fs(struct super_block *sb);
+static int yaffs_write_super(struct super_block *sb);
+#endif
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf);
+#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf);
+#else
+static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
+#endif
+
+#ifdef YAFFS_HAS_PUT_INODE
+static void yaffs_put_inode(struct inode *inode);
+#endif
+
+static void yaffs_delete_inode(struct inode *);
+static void yaffs_clear_inode(struct inode *);
+
+static int yaffs_readpage(struct file *file, struct page *page);
+#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
+
+
+#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);
+static int yaffs_write_end(struct file *filp, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned copied,
+ struct page *pg, void *fsdadata);
+#else
+static int yaffs_prepare_write(struct file *f, struct page *pg,
+ unsigned offset, unsigned to);
+static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
+ unsigned to);
+
+#endif
+
+static int yaffs_readlink(struct dentry *dentry, char __user *buffer,
+ int buflen);
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
+static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
+#else
+static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
+#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, 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
+
+static const struct inode_operations yaffs_file_inode_operations = {
+ .setattr = yaffs_setattr,
+};
+
+static const struct inode_operations yaffs_symlink_inode_operations = {
+ .readlink = yaffs_readlink,
+ .follow_link = yaffs_follow_link,
+ .setattr = yaffs_setattr,
+};
+
+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,
+};
+
+static const struct file_operations yaffs_dir_operations = {
+ .read = generic_read_dir,
+ .readdir = yaffs_readdir,
+ .fsync = yaffs_sync_object,
+};
+
+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,
+ .delete_inode = yaffs_delete_inode,
+ .clear_inode = yaffs_clear_inode,
+ .sync_fs = yaffs_sync_fs,
+ .write_super = yaffs_write_super,
+};
+
+static void yaffs_GrossLock(yaffs_Device *dev)
+{
+ T(YAFFS_TRACE_OS, ("yaffs locking %p\n", current));
+ down(&dev->grossLock);
+ T(YAFFS_TRACE_OS, ("yaffs locked %p\n", current));
+}
+
+static void yaffs_GrossUnlock(yaffs_Device *dev)
+{
+ T(YAFFS_TRACE_OS, ("yaffs unlocking %p\n", current));
+ up(&dev->grossLock);
+}
+
+static int yaffs_readlink(struct dentry *dentry, char __user *buffer,
+ int buflen)
+{
+ unsigned char *alias;
+ int ret;
+
+ yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
+
+ yaffs_GrossLock(dev);
+
+ alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
+
+ yaffs_GrossUnlock(dev);
+
+ if (!alias)
+ return -ENOMEM;
+
+ ret = vfs_readlink(dentry, buffer, buflen, alias);
+ kfree(alias);
+ return ret;
+}
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
+static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
+#else
+static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
+#endif
+{
+ unsigned char *alias;
+ int ret;
+ yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
+
+ yaffs_GrossLock(dev);
+
+ alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
+
+ yaffs_GrossUnlock(dev);
+
+ if (!alias) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ ret = vfs_follow_link(nd, alias);
+ kfree(alias);
+out:
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
+ return ERR_PTR(ret);
+#else
+ return ret;
+#endif
+}
+
+struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
+ yaffs_Object *obj);
+
+/*
+ * Lookup is used to find objects in the fs
+ */
+#if (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
+{
+ yaffs_Object *obj;
+ struct inode *inode = NULL; /* NCB 2.5/2.6 needs NULL here */
+
+ yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
+
+ yaffs_GrossLock(dev);
+
+ T(YAFFS_TRACE_OS,
+ ("yaffs_lookup for %d:%s\n",
+ yaffs_InodeToObject(dir)->objectId, dentry->d_name.name));
+
+ obj = yaffs_FindObjectByName(yaffs_InodeToObject(dir),
+ dentry->d_name.name);
+
+ obj = yaffs_GetEquivalentObject(obj); /* in case it was a hardlink */
+
+ /* Can't hold gross lock when calling yaffs_get_inode() */
+ yaffs_GrossUnlock(dev);
+
+ if (obj) {
+ T(YAFFS_TRACE_OS,
+ ("yaffs_lookup found %d\n", obj->objectId));
+
+ inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
+
+ if (inode) {
+ T(YAFFS_TRACE_OS,
+ ("yaffs_loookup dentry \n"));
+/* #if 0 asserted by NCB for 2.5/6 compatability - falls through to
+ * d_add even if NULL inode */
+#if 0
+ /*dget(dentry); // try to solve directory bug */
+ d_add(dentry, inode);
+
+ /* return dentry; */
+ return NULL;
+#endif
+ }
+
+ } else {
+ T(YAFFS_TRACE_OS, ("yaffs_lookup not found\n"));
+
+ }
+
+/* added NCB for 2.5/6 compatability - forces add even if inode is
+ * NULL which creates dentry hash */
+ d_add(dentry, inode);
+
+ return NULL;
+}
+
+
+#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)
+{
+ T(YAFFS_TRACE_OS,
+ ("yaffs_put_inode: ino %d, count %d\n", (int)inode->i_ino,
+ atomic_read(&inode->i_count)));
+
+}
+#endif
+
+/* clear is called to tell the fs to release any per-inode data it holds */
+static void yaffs_clear_inode(struct inode *inode)
+{
+ yaffs_Object *obj;
+ yaffs_Device *dev;
+
+ obj = yaffs_InodeToObject(inode);
+
+ T(YAFFS_TRACE_OS,
+ ("yaffs_clear_inode: ino %d, count %d %s\n", (int)inode->i_ino,
+ atomic_read(&inode->i_count),
+ obj ? "object exists" : "null object"));
+
+ if (obj) {
+ dev = obj->myDev;
+ yaffs_GrossLock(dev);
+
+ /* Clear the association between the inode and
+ * the yaffs_Object.
+ */
+ obj->myInode = NULL;
+ yaffs_InodeToObjectLV(inode) = NULL;
+
+ /* If the object freeing was deferred, then the real
+ * free happens now.
+ * This should fix the inode inconsistency problem.
+ */
+
+ yaffs_HandleDeferedFree(obj);
+
+ yaffs_GrossUnlock(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)
+{
+ yaffs_Object *obj = yaffs_InodeToObject(inode);
+ yaffs_Device *dev;
+
+ T(YAFFS_TRACE_OS,
+ ("yaffs_delete_inode: ino %d, count %d %s\n", (int)inode->i_ino,
+ atomic_read(&inode->i_count),
+ obj ? "object exists" : "null object"));
+
+ if (obj) {
+ dev = obj->myDev;
+ yaffs_GrossLock(dev);
+ yaffs_DeleteObject(obj);
+ yaffs_GrossUnlock(dev);
+ }
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
+ truncate_inode_pages(&inode->i_data, 0);
+#endif
+ clear_inode(inode);
+}
+
+#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
+{
+ yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
+
+ yaffs_Device *dev = obj->myDev;
+
+ T(YAFFS_TRACE_OS,
+ ("yaffs_file_flush object %d (%s)\n", obj->objectId,
+ obj->dirty ? "dirty" : "clean"));
+
+ yaffs_GrossLock(dev);
+
+ yaffs_FlushFile(obj, 1);
+
+ yaffs_GrossUnlock(dev);
+
+ return 0;
+}
+
+static int yaffs_readpage_nolock(struct file *f, struct page *pg)
+{
+ /* Lifted from jffs2 */
+
+ yaffs_Object *obj;
+ unsigned char *pg_buf;
+ int ret;
+
+ yaffs_Device *dev;
+
+ T(YAFFS_TRACE_OS, ("yaffs_readpage at %08x, size %08x\n",
+ (unsigned)(pg->index << PAGE_CACHE_SHIFT),
+ (unsigned)PAGE_CACHE_SIZE));
+
+ obj = yaffs_DentryToObject(f->f_dentry);
+
+ dev = obj->myDev;
+
+#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_GrossLock(dev);
+
+ ret = yaffs_ReadDataFromFile(obj, pg_buf,
+ pg->index << PAGE_CACHE_SHIFT,
+ PAGE_CACHE_SIZE);
+
+ yaffs_GrossUnlock(dev);
+
+ if (ret >= 0)
+ ret = 0;
+
+ if (ret) {
+ ClearPageUptodate(pg);
+ SetPageError(pg);
+ } else {
+ SetPageUptodate(pg);
+ ClearPageError(pg);
+ }
+
+ flush_dcache_page(pg);
+ kunmap(pg);
+
+ T(YAFFS_TRACE_OS, ("yaffs_readpage done\n"));
+ 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)
+{
+ return yaffs_readpage_unlock(f, pg);
+}
+
+/* writepage inspired by/stolen from smbfs */
+
+#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 address_space *mapping = page->mapping;
+ loff_t offset = (loff_t) page->index << PAGE_CACHE_SHIFT;
+ struct inode *inode;
+ unsigned long end_index;
+ char *buffer;
+ yaffs_Object *obj;
+ int nWritten = 0;
+ unsigned nBytes;
+
+ if (!mapping)
+ BUG();
+ inode = mapping->host;
+ if (!inode)
+ BUG();
+
+ if (offset > inode->i_size) {
+ T(YAFFS_TRACE_OS,
+ ("yaffs_writepage at %08x, inode size = %08x!!!\n",
+ (unsigned)(page->index << PAGE_CACHE_SHIFT),
+ (unsigned)inode->i_size));
+ T(YAFFS_TRACE_OS,
+ (" -> don't care!!\n"));
+ unlock_page(page);
+ return 0;
+ }
+
+ end_index = inode->i_size >> PAGE_CACHE_SHIFT;
+
+ /* easy case */
+ if (page->index < end_index)
+ nBytes = PAGE_CACHE_SIZE;
+ else
+ nBytes = inode->i_size & (PAGE_CACHE_SIZE - 1);
+
+ get_page(page);
+
+ buffer = kmap(page);
+
+ obj = yaffs_InodeToObject(inode);
+ yaffs_GrossLock(obj->myDev);
+
+ T(YAFFS_TRACE_OS,
+ ("yaffs_writepage at %08x, size %08x\n",
+ (unsigned)(page->index << PAGE_CACHE_SHIFT), nBytes));
+ T(YAFFS_TRACE_OS,
+ ("writepag0: obj = %05x, ino = %05x\n",
+ (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
+
+ nWritten = yaffs_WriteDataToFile(obj, buffer,
+ page->index << PAGE_CACHE_SHIFT, nBytes, 0);
+
+ T(YAFFS_TRACE_OS,
+ ("writepag1: obj = %05x, ino = %05x\n",
+ (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
+
+ yaffs_GrossUnlock(obj->myDev);
+
+ kunmap(page);
+ SetPageUptodate(page);
+ UnlockPage(page);
+ put_page(page);
+
+ return (nWritten == nBytes) ? 0 : -ENOSPC;
+}
+
+
+#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;
+ uint32_t offset = pos & (PAGE_CACHE_SIZE - 1);
+ uint32_t to = offset + len;
+
+ int ret = 0;
+ int space_held = 0;
+
+ T(YAFFS_TRACE_OS, ("start yaffs_write_begin\n"));
+ /* 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;
+ }
+ /* Get fs space */
+ space_held = yaffs_hold_space(filp);
+
+ if (!space_held) {
+ ret = -ENOSPC;
+ goto out;
+ }
+
+ /* Update page if required */
+
+ if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
+ ret = yaffs_readpage_nolock(filp, pg);
+
+ if (ret)
+ goto out;
+
+ /* Happy path return */
+ T(YAFFS_TRACE_OS, ("end yaffs_write_begin - ok\n"));
+
+ return 0;
+
+out:
+ T(YAFFS_TRACE_OS, ("end yaffs_write_begin fail returning %d\n", 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)
+{
+ T(YAFFS_TRACE_OS, ("yaffs_prepair_write\n"));
+
+ if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
+ return yaffs_readpage_nolock(f, pg);
+ return 0;
+}
+#endif
+
+#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;
+
+ T(YAFFS_TRACE_OS,
+ ("yaffs_write_end addr %x pos %x nBytes %d\n",
+ (unsigned) addr,
+ (int)pos, copied));
+
+ ret = yaffs_file_write(filp, addr, copied, &pos);
+
+ if (ret != copied) {
+ T(YAFFS_TRACE_OS,
+ ("yaffs_write_end not same size ret %d copied %d\n",
+ ret, copied));
+ SetPageError(pg);
+ ClearPageUptodate(pg);
+ } else {
+ SetPageUptodate(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 nBytes = to - offset;
+ int nWritten;
+
+ unsigned spos = pos;
+ unsigned saddr;
+
+ kva = kmap(pg);
+ addr = kva + offset;
+
+ saddr = (unsigned) addr;
+
+ T(YAFFS_TRACE_OS,
+ ("yaffs_commit_write addr %x pos %x nBytes %d\n",
+ saddr, spos, nBytes));
+
+ nWritten = yaffs_file_write(f, addr, nBytes, &pos);
+
+ if (nWritten != nBytes) {
+ T(YAFFS_TRACE_OS,
+ ("yaffs_commit_write not same size nWritten %d nBytes %d\n",
+ nWritten, nBytes));
+ SetPageError(pg);
+ ClearPageUptodate(pg);
+ } else {
+ SetPageUptodate(pg);
+ }
+
+ kunmap(pg);
+
+ T(YAFFS_TRACE_OS,
+ ("yaffs_commit_write returning %d\n",
+ nWritten == nBytes ? 0 : nWritten));
+
+ return nWritten == nBytes ? 0 : nWritten;
+}
+#endif
+
+
+static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj)
+{
+ if (inode && obj) {
+
+
+ /* Check mode against the variant type and attempt to repair if broken. */
+ __u32 mode = obj->yst_mode;
+ switch (obj->variantType) {
+ 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->objectId;
+ inode->i_mode = obj->yst_mode;
+ inode->i_uid = obj->yst_uid;
+ inode->i_gid = 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_