yaffs Add multi and single version Linux glue code
authorCharles Manning <cdhmanning@gmail.com>
Sat, 25 Sep 2010 01:27:11 +0000 (13:27 +1200)
committerCharles Manning <cdhmanning@gmail.com>
Sat, 25 Sep 2010 01:27:11 +0000 (13:27 +1200)
First step to single/mutli veriosns of yaffs for mainlining.

Signed-off-by: Charles Manning <cdhmanning@gmail.com>
Makefile
Makefile.kernel
patch-ker.sh
yaffs_vfs.c [moved from yaffs_fs.c with 100% similarity]
yaffs_vfs_multi.c [new file with mode: 0644]

index da8a9f1..0192d08 100644 (file)
--- a/Makefile
+++ b/Makefile
 ifneq ($(KERNELRELEASE),)
        EXTRA_CFLAGS += -DYAFFS_OUT_OF_TREE
 
-       obj-m := yaffs2.o
+       obj-m := yaffs2.o yaffs2multi.o
 
        yaffs2-objs := yaffs_mtdif.o yaffs_mtdif2.o
        yaffs2-objs += yaffs_mtdif1.o yaffs_packedtags1.o
-       yaffs2-objs += yaffs_ecc.o yaffs_fs.o yaffs_guts.o
+       yaffs2-objs += yaffs_ecc.o yaffs_vfs.o yaffs_guts.o
        yaffs2-objs += yaffs_packedtags2.o
        yaffs2-objs += yaffs_tagscompat.o yaffs_tagsvalidity.o
        yaffs2-objs += yaffs_checkptrw.o yaffs_nand.o
@@ -30,6 +30,18 @@ ifneq ($(KERNELRELEASE),)
        yaffs2-objs += yaffs_yaffs2.o
        yaffs2-objs += yaffs_verify.o
 
+       yaffs2multi-objs := yaffs_mtdif.o yaffs_mtdif2.o
+       yaffs2multi-objs += yaffs_mtdif1.o yaffs_packedtags1.o
+       yaffs2multi-objs += yaffs_ecc.o yaffs_vfs_multi.o yaffs_guts.o
+       yaffs2multi-objs += yaffs_packedtags2.o
+       yaffs2multi-objs += yaffs_tagscompat.o yaffs_tagsvalidity.o
+       yaffs2multi-objs += yaffs_checkptrw.o yaffs_nand.o
+       yaffs2multi-objs += yaffs_checkptrw.o yaffs_nand.o yaffs_nameval.o
+       yaffs2multi-objs += yaffs_allocator.o yaffs_bitmap.o
+       yaffs2multi-objs += yaffs_yaffs1.o
+       yaffs2multi-objs += yaffs_yaffs2.o
+       yaffs2multi-objs += yaffs_verify.o
+
 else
        KERNELDIR ?= /lib/modules/$(shell uname -r)/build
        PWD := $(shell pwd)
index e8c056f..fbdbd4a 100644 (file)
@@ -4,7 +4,7 @@
 
 obj-$(CONFIG_YAFFS_FS) += yaffs.o
 
-yaffs-y := yaffs_ecc.o yaffs_fs.o yaffs_guts.o yaffs_checkptrw.o
+yaffs-y := yaffs_ecc.o yaffs_vfs_glue.o yaffs_guts.o yaffs_checkptrw.o
 yaffs-y += yaffs_packedtags1.o yaffs_packedtags2.o yaffs_nand.o
 yaffs-y += yaffs_tagscompat.o yaffs_tagsvalidity.o
 yaffs-y += yaffs_mtdif.o yaffs_mtdif1.o yaffs_mtdif2.o
index ad92e7c..4393e8d 100755 (executable)
@@ -22,15 +22,17 @@ VERSION=0
 PATCHLEVEL=0
 SUBLEVEL=0
 COPYORLINK=$1
-LINUXDIR=$2
+MULTIORSINGLE=$2
+LINUXDIR=$3
 
 # To be a Linux directory, it must have a Makefile
 
 
 # Display usage of this script
 usage () {
-       echo "usage:  $0  c/l kernelpath"
+       echo "usage:  $0  c/l m/s kernelpath"
        echo " if c/l is c, then copy. If l then link"
+       echo " if m/s is m, then use multi version code. If s then use single version code"
        exit 1
 }
 
@@ -50,6 +52,15 @@ else
    usage;
 fi
 
+if [ $MULTIORSINGLE = m ]; then
+   VFSGLUE="yaffs_vfs_multi.c"
+elif [ $MULTIORSINGLE = s ]; then
+   VFSGLUE="yaffs_vfs.c"
+else
+   echo "unknown multi/single version selection"
+   usage;
+fi
+
 
 # Check if kerneldir contains a Makefile
 if [ ! -f $LINUXDIR/Makefile ]
@@ -120,4 +131,6 @@ else
    $CPY  $PWD/Makefile.kernel $LINUXDIR/fs/yaffs2/Makefile
    $CPY $PWD/Kconfig $LINUXDIR/fs/yaffs2
    $CPY $PWD/*.c $PWD/*.h  $LINUXDIR/fs/yaffs2
+   rm $LINUXDIR/fs/yaffs2/yaffs_vfs.c $LINUXDIR/fs/yaffs2/yaffs_vfs_multi.c
+   $CPY $PWD/$VFSGLUE $LINUXDIR/fs/yaffs2/yaffs_vfs_glue.c
 fi
similarity index 100%
rename from yaffs_fs.c
rename to yaffs_vfs.c
diff --git a/yaffs_vfs_multi.c b/yaffs_vfs_multi.c
new file mode 100644 (file)
index 0000000..7d21cba
--- /dev/null
@@ -0,0 +1,3568 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 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.
+ */
+
+#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(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>
+
+#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, 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 <linux/mtd/mtd.h>
+
+#include "yportenv.h"
+#include "yaffs_trace.h"
+#include "yaffs_guts.h"
+
+#include "yaffs_linux.h"
+
+#include "yaffs_mtdif.h"
+#include "yaffs_mtdif1.h"
+#include "yaffs_mtdif2.h"
+
+unsigned int yaffs_traceMask = YAFFS_TRACE_BAD_BLOCKS | YAFFS_TRACE_ALWAYS;
+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;
+
+/* 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);
+module_param(yaffs_gc_control, uint, 0644);
+module_param(yaffs_bg_enable, uint, 0644);
+#else
+MODULE_PARM(yaffs_traceMask, "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))
+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
+
+#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
+
+
+#define update_dir_time(dir) do {\
+                       (dir)->i_ctime = (dir)->i_mtime = CURRENT_TIME; \
+               } while(0)
+               
+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
+
+#if (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
+
+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
+
+#ifdef YAFFS_HAS_EVICT_INODE
+static void yaffs_evict_inode(struct inode *);
+#else
+static void yaffs_delete_inode(struct inode *);
+static void yaffs_clear_inode(struct inode *);
+#endif
+
+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
+
+#ifdef CONFIG_YAFFS_XATTR
+int yaffs_setxattr(struct dentry *dentry, const char *name,
+                       const void *value, size_t size, int flags);
+ssize_t yaffs_getxattr(struct dentry *dentry, const char *name, void *buff,
+                       size_t size);
+int yaffs_removexattr(struct dentry *dentry, const char *name);
+ssize_t yaffs_listxattr(struct dentry *dentry, char *buff, size_t size);
+#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 (YAFFS_NEW_FOLLOW_LINK == 1)
+void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias);
+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 void yaffs_MarkSuperBlockDirty(yaffs_Device *dev);
+
+static loff_t yaffs_dir_llseek(struct file *file, loff_t offset, int origin);
+
+static int yaffs_vfs_setattr(struct inode *, struct iattr *);
+
+
+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
+
+#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 const struct inode_operations yaffs_file_inode_operations = {
+       .setattr = yaffs_setattr,
+#ifdef CONFIG_YAFFS_XATTR
+       .setxattr = yaffs_setxattr,
+       .getxattr = yaffs_getxattr,
+       .listxattr = yaffs_listxattr,
+       .removexattr = yaffs_removexattr,
+#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,
+#ifdef CONFIG_YAFFS_XATTR
+       .setxattr = yaffs_setxattr,
+       .getxattr = yaffs_getxattr,
+       .listxattr = yaffs_listxattr,
+       .removexattr = yaffs_removexattr,
+#endif
+};
+
+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,
+#ifdef CONFIG_YAFFS_XATTR
+       .setxattr = yaffs_setxattr,
+       .getxattr = yaffs_getxattr,
+       .listxattr = yaffs_listxattr,
+       .removexattr = yaffs_removexattr,
+#endif
+};
+
+static const struct file_operations yaffs_dir_operations = {
+       .read = generic_read_dir,
+       .readdir = yaffs_readdir,
+       .fsync = yaffs_sync_object,
+       .llseek = yaffs_dir_llseek,
+};
+
+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,
+       .write_super = yaffs_write_super,
+};
+
+
+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_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 unsigned yaffs_gc_control_callback(yaffs_Device *dev)
+{
+       return yaffs_gc_control;
+}
+                                                                                                                       
+static void yaffs_GrossLock(yaffs_Device *dev)
+{
+       T(YAFFS_TRACE_LOCK, (TSTR("yaffs locking %p\n"), current));
+       down(&(yaffs_DeviceToLC(dev)->grossLock));
+       T(YAFFS_TRACE_LOCK, (TSTR("yaffs locked %p\n"), current));
+}
+
+static void yaffs_GrossUnlock(yaffs_Device *dev)
+{
+       T(YAFFS_TRACE_LOCK, (TSTR("yaffs unlocking %p\n"), current));
+       up(&(yaffs_DeviceToLC(dev)->grossLock));
+}
+
+#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;
+       yaffs_Object *d_obj;
+       yaffs_Object *parent_obj;
+
+       d_obj = yaffs_InodeToObject(dentry->d_inode);
+
+       if (d_obj) {
+               parent_obj = d_obj->parent;
+               if (parent_obj) {
+                       parent_ino = yaffs_GetObjectInode(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
+
+/*-----------------------------------------------------------------*/
+/* 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 removeObjectCallback 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 yaffs_Device 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_SearchContext {
+       yaffs_Device *dev;
+       yaffs_Object *dirObj;
+       yaffs_Object *nextReturn;
+       struct ylist_head others;
+};
+
+/*
+ * yaffs_NewSearch() 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_SearchContext * yaffs_NewSearch(yaffs_Object *dir)
+{
+       yaffs_Device *dev = dir->myDev;
+       struct yaffs_SearchContext *sc = YMALLOC(sizeof(struct yaffs_SearchContext));
+       if(sc){
+               sc->dirObj = dir;
+               sc->dev = dev;
+               if( ylist_empty(&sc->dirObj->variant.directoryVariant.children))
+                       sc->nextReturn = NULL;
+               else
+                       sc->nextReturn = ylist_entry(
+                                dir->variant.directoryVariant.children.next,
+                               yaffs_Object,siblings);
+               YINIT_LIST_HEAD(&sc->others);
+               ylist_add(&sc->others,&(yaffs_DeviceToLC(dev)->searchContexts));
+       }
+       return sc;
+}
+
+/*
+ * yaffs_EndSearch() disposes of a search context and cleans up.
+ */
+static void yaffs_EndSearch(struct yaffs_SearchContext * sc)
+{
+       if(sc){
+               ylist_del(&sc->others);
+               YFREE(sc);
+       }
+}
+
+/*
+ * yaffs_SearchAdvance() 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_SearchAdvance(struct yaffs_SearchContext *sc)
+{
+        if(!sc)
+                return;
+
+        if( sc->nextReturn == NULL ||
+                ylist_empty(&sc->dirObj->variant.directoryVariant.children))
+                sc->nextReturn = NULL;
+        else {
+                struct ylist_head *next = sc->nextReturn->siblings.next;
+
+                if( next == &sc->dirObj->variant.directoryVariant.children)
+                        sc->nextReturn = NULL; /* end of list */
+                else
+                        sc->nextReturn = ylist_entry(next,yaffs_Object,siblings);
+        }
+}
+
+/*
+ * yaffs_RemoveObjectCallback() 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_RemoveObjectCallback(yaffs_Object *obj)
+{
+
+        struct ylist_head *i;
+        struct yaffs_SearchContext *sc;
+        struct ylist_head *search_contexts = &(yaffs_DeviceToLC(obj->myDev)->searchContexts);
+
+
+        /* 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.
+         */
+         ylist_for_each(i, search_contexts) {
+                if (i) {
+                        sc = ylist_entry(i, struct yaffs_SearchContext,others);
+                        if(sc->nextReturn == obj)
+                                yaffs_SearchAdvance(sc);
+                }
+       }
+
+}
+
+
+/*-----------------------------------------------------------------*/
+
+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 (YAFFS_NEW_FOLLOW_LINK == 1)
+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;
+       }
+
+#if (YAFFS_NEW_FOLLOW_LINK == 1)
+       nd_set_link(nd, alias);
+       ret = (int)alias;
+out:
+       return ERR_PTR(ret);
+#else
+       ret = vfs_follow_link(nd, alias);
+       kfree(alias);
+out:
+       return ret;
+#endif
+}
+
+#if (YAFFS_NEW_FOLLOW_LINK == 1)
+void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias) {
+       kfree(alias);
+}
+#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;
+
+       if(current != yaffs_DeviceToLC(dev)->readdirProcess)
+               yaffs_GrossLock(dev);
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("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() */
+       if(current != yaffs_DeviceToLC(dev)->readdirProcess)
+               yaffs_GrossUnlock(dev);
+
+       if (obj) {
+               T(YAFFS_TRACE_OS,
+                       (TSTR("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,
+                               (TSTR("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,(TSTR("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,
+               (TSTR("yaffs_put_inode: ino %d, count %d\n"), (int)inode->i_ino,
+               atomic_read(&inode->i_count)));
+
+}
+#endif
+
+
+static void yaffs_UnstitchObject(struct inode *inode, yaffs_Object *obj)
+{
+       /* 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);
+}
+
+#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)
+{
+       yaffs_Object *obj;
+       yaffs_Device *dev;
+       int deleteme = 0;
+
+       obj = yaffs_InodeToObject(inode);
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_evict_inode: ino %d, count %d %s\n"), (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);
+       end_writeback(inode);
+
+       if(deleteme && obj){
+               dev = obj->myDev;
+               yaffs_GrossLock(dev);
+               yaffs_DeleteObject(obj);
+               yaffs_GrossUnlock(dev);
+       }
+       if (obj) {
+               dev = obj->myDev;
+               yaffs_GrossLock(dev);
+               yaffs_UnstitchObject(inode,obj);
+               yaffs_GrossUnlock(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)
+{
+       yaffs_Object *obj;
+       yaffs_Device *dev;
+
+       obj = yaffs_InodeToObject(inode);
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("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);
+               yaffs_UnstitchObject(inode,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,
+               (TSTR("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);
+}
+#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
+{
+       yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
+
+       yaffs_Device *dev = obj->myDev;
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_file_flush object %d (%s)\n"), obj->objectId,
+               obj->dirty ? "dirty" : "clean"));
+
+       yaffs_GrossLock(dev);
+
+       yaffs_FlushFile(obj, 1, 0);
+
+       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,
+               (TSTR("yaffs_readpage_nolock 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, (TSTR("yaffs_readpage_nolock 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)
+{
+       int ret;
+
+       T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage\n")));
+       ret=yaffs_readpage_unlock(f, pg);
+       T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage done\n")));
+       return ret;
+}
+
+/* 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
+{
+       yaffs_Device *dev;
+       struct address_space *mapping = page->mapping;
+       struct inode *inode;
+       unsigned long end_index;
+       char *buffer;
+       yaffs_Object *obj;
+       int nWritten = 0;
+       unsigned nBytes;
+       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)
+               nBytes = PAGE_CACHE_SIZE;
+       else {
+               nBytes = i_size & (PAGE_CACHE_SIZE -1);
+
+               if (page->index > end_index || !nBytes) {
+                       T(YAFFS_TRACE_OS,
+                               (TSTR("yaffs_writepage at %08x, inode size = %08x!!!\n"),
+                               (unsigned)(page->index << PAGE_CACHE_SHIFT),
+                               (unsigned)inode->i_size));
+                       T(YAFFS_TRACE_OS,
+                               (TSTR("                -> don't care!!\n")));
+
+                       zero_user_segment(page,0,PAGE_CACHE_SIZE);
+                       set_page_writeback(page);
+                       unlock_page(page);
+                       end_page_writeback(page);
+                       return 0;
+               }
+       }
+
+       if(nBytes != PAGE_CACHE_SIZE)
+               zero_user_segment(page,nBytes,PAGE_CACHE_SIZE);
+
+       get_page(page);
+
+       buffer = kmap(page);
+
+       obj = yaffs_InodeToObject(inode);
+       dev = obj->myDev;
+       yaffs_GrossLock(dev);
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_writepage at %08x, size %08x\n"),
+               (unsigned)(page->index << PAGE_CACHE_SHIFT), nBytes));
+       T(YAFFS_TRACE_OS,
+               (TSTR("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);
+
+       yaffs_MarkSuperBlockDirty(dev);
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("writepag1: obj = %05x, ino = %05x\n"),
+               (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
+
+       yaffs_GrossUnlock(dev);
+
+       kunmap(page);
+       set_page_writeback(page);
+       unlock_page(page);
+       end_page_writeback(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;
+
+       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;
+       }
+       T(YAFFS_TRACE_OS,
+               (TSTR("start yaffs_write_begin index %d(%x) uptodate %d\n"),
+               (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 */
+       T(YAFFS_TRACE_OS, (TSTR("end yaffs_write_begin - ok\n")));
+
+       return 0;
+
+out:
+       T(YAFFS_TRACE_OS,
+               (TSTR("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, (TSTR("yaffs_prepair_write\n")));
+
+       if (!Page_Uptodate(pg))
+               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 %p pos %x nBytes %d\n",
+               addr,(unsigned)pos, copied));
+
+       ret = yaffs_file_write(filp, addr, copied, &pos);
+
+       if (ret != copied) {
+               T(YAFFS_TRACE_OS,
+                       (TSTR("yaffs_write_end not same size ret %d  copied %d\n"),
+                       ret, copied));
+               SetPageError(pg);
+       } else {
+               /* Nothing */
+       }
+
+       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,
+               (TSTR("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,
+                       (TSTR("yaffs_commit_write not same size nWritten %d  nBytes %d\n"),
+                       nWritten, nBytes));
+               SetPageError(pg);
+       } else {
+               /* Nothing */
+       }
+
+       kunmap(pg);
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("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_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_GetObjectFileLength(obj);
+               inode->i_blocks = (inode->i_size + 511) >> 9;
+
+               inode->i_nlink = yaffs_GetObjectLinkCount(obj);
+
+               T(YAFFS_TRACE_OS,
+                       (TSTR("yaffs_FillInode mode %x uid %d gid %d size %d count %d\n"),
+                       inode->i_mode, inode->i_uid, inode->i_gid,
+                       (int)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_InodeToObjectLV(inode) = obj;
+
+               obj->myInode = inode;
+
+       } else {
+               T(YAFFS_TRACE_OS,
+                       (TSTR("yaffs_FileInode invalid parameters\n")));
+       }
+
+}
+
+struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
+                               yaffs_Object *obj)
+{
+       struct inode *inode;
+
+       if (!sb) {
+               T(YAFFS_TRACE_OS,
+                       (TSTR("yaffs_get_inode for NULL super_block!!\n")));
+               return NULL;
+
+       }
+
+       if (!obj) {
+               T(YAFFS_TRACE_OS,
+                       (TSTR("yaffs_get_inode for NULL object!!\n")));
+               return NULL;
+
+       }
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_get_inode for object %d\n"), obj->objectId));
+
+       inode = Y_IGET(sb, obj->objectId);
+       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 grossLock or deadlock will happen! */
+
+       return inode;
+}
+
+static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
+                               loff_t *pos)
+{
+       yaffs_Object *obj;
+       int nWritten, ipos;
+       struct inode *inode;
+       yaffs_Device *dev;
+
+       obj = yaffs_DentryToObject(f->f_dentry);
+
+       dev = obj->myDev;
+
+       yaffs_GrossLock(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;
+
+       if (!obj)
+               T(YAFFS_TRACE_OS,
+                       (TSTR("yaffs_file_write: hey obj is null!\n")));
+       else
+               T(YAFFS_TRACE_OS,
+                       (TSTR("yaffs_file_write about to write writing %u(%x) bytes"
+                       "to object %d at %d(%x)\n"),
+                       (unsigned) n, (unsigned) n, obj->objectId, ipos,ipos));
+
+       nWritten = yaffs_WriteDataToFile(obj, buf, ipos, n, 0);
+
+       yaffs_MarkSuperBlockDirty(dev);
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_file_write: %d(%x) bytes written\n"),
+               (unsigned )n,(unsigned)n));
+
+       if (nWritten > 0) {
+               ipos += nWritten;
+               *pos = ipos;
+               if (ipos > inode->i_size) {
+                       inode->i_size = ipos;
+                       inode->i_blocks = (ipos + 511) >> 9;
+
+                       T(YAFFS_TRACE_OS,
+                               (TSTR("yaffs_file_write size updated to %d bytes, "
+                               "%d blocks\n"),
+                               ipos, (int)(inode->i_blocks)));
+               }
+
+       }
+       yaffs_GrossUnlock(dev);
+       return (nWritten == 0) && (n > 0) ? -ENOSPC : nWritten;
+}
+
+/* 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)
+{
+       yaffs_Object *obj;
+       yaffs_Device *dev;
+
+       int nFreeChunks;
+
+
+       obj = yaffs_DentryToObject(f->f_dentry);
+
+       dev = obj->myDev;
+
+       yaffs_GrossLock(dev);
+
+       nFreeChunks = yaffs_GetNumberOfFreeChunks(dev);
+
+       yaffs_GrossUnlock(dev);
+
+       return (nFreeChunks > 20) ? 1 : 0;
+}
+
+static void yaffs_release_space(struct file *f)
+{
+       yaffs_Object *obj;
+       yaffs_Device *dev;
+
+
+       obj = yaffs_DentryToObject(f->f_dentry);
+
+       dev = obj->myDev;
+
+       yaffs_GrossLock(dev);
+
+
+       yaffs_GrossUnlock(dev);
+}
+
+
+static loff_t yaffs_dir_llseek(struct file *file, loff_t offset, int origin)
+{
+       long long retval;
+
+       lock_kernel();
+
+       switch (origin){
+       case 2:
+               offset += i_size_read(file->f_path.dentry->d_inode);
+               break;
+       case 1:
+               offset += file->f_pos;
+       }
+       retval = -EINVAL;
+
+       if (offset >= 0){
+               if (offset != file->f_pos)
+                       file->f_pos = offset;
+
+               retval = offset;
+       }
+       unlock_kernel();
+       return retval;
+}
+
+
+static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
+{
+       yaffs_Object *obj;
+       yaffs_Device *dev;
+        struct yaffs_SearchContext *sc;
+       struct inode *inode = f->f_dentry->d_inode;
+       unsigned long offset, curoffs;
+       yaffs_Object *l;
+        int retVal = 0;
+
+       char name[YAFFS_MAX_NAME_LENGTH + 1];
+
+       obj = yaffs_DentryToObject(f->f_dentry);
+       dev = obj->myDev;
+
+       yaffs_GrossLock(dev);
+
+       yaffs_DeviceToLC(dev)->readdirProcess = current;
+
+       offset = f->f_pos;
+
+        sc = yaffs_NewSearch(obj);
+        if(!sc){
+                retVal = -ENOMEM;
+                goto out;
+        }
+
+       T(YAFFS_TRACE_OS, (TSTR("yaffs_readdir: starting at %d\n"), (int)offset));
+
+       if (offset == 0) {
+               T(YAFFS_TRACE_OS,
+                       (TSTR("yaffs_readdir: entry . ino %d \n"),
+                       (int)inode->i_ino));
+               yaffs_GrossUnlock(dev);
+               if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0){
+                       yaffs_GrossLock(dev);
+                       goto out;
+               }
+               yaffs_GrossLock(dev);
+               offset++;
+               f->f_pos++;
+       }
+       if (offset == 1) {
+               T(YAFFS_TRACE_OS,
+                       (TSTR("yaffs_readdir: entry .. ino %d \n"),
+                       (int)f->f_dentry->d_parent->d_inode->i_ino));
+               yaffs_GrossUnlock(dev);
+               if (filldir(dirent, "..", 2, offset,
+                       f->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0){
+                       yaffs_GrossLock(dev);
+                       goto out;
+               }
+               yaffs_GrossLock(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->nextReturn){
+               curoffs++;
+                l = sc->nextReturn;
+               if (curoffs >= offset) {
+                        int this_inode = yaffs_GetObjectInode(l);
+                        int this_type = yaffs_GetObjectType(l);
+
+                       yaffs_GetObjectName(l, name,
+                                           YAFFS_MAX_NAME_LENGTH + 1);
+                       T(YAFFS_TRACE_OS,
+                         (TSTR("yaffs_readdir: %s inode %d\n"),
+                         name, yaffs_GetObjectInode(l)));
+
+                        yaffs_GrossUnlock(dev);
+
+                       if (filldir(dirent,
+                                       name,
+                                       strlen(name),
+                                       offset,
+                                       this_inode,
+                                       this_type) < 0){
+                               yaffs_GrossLock(dev);
+                               goto out;
+                       }
+
+                        yaffs_GrossLock(dev);
+
+                       offset++;
+                       f->f_pos++;
+               }
+                yaffs_SearchAdvance(sc);
+       }
+
+out:
+       yaffs_EndSearch(sc);
+       yaffs_DeviceToLC(dev)->readdirProcess = NULL;
+       yaffs_GrossUnlock(dev);
+
+       return retVal;
+}
+
+
+
+/*
+ * File creation. Allocate an inode, and we're done..
+ */
+
+#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(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;
+
+       yaffs_Object *obj = NULL;
+       yaffs_Device *dev;
+
+       yaffs_Object *parent = yaffs_InodeToObject(dir);
+
+       int error = -ENOSPC;
+       uid_t uid = YCRED(current)->fsuid;
+       gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
+
+       if ((dir->i_mode & S_ISGID) && S_ISDIR(mode))
+               mode |= S_ISGID;
+
+       if (parent) {
+               T(YAFFS_TRACE_OS,
+                       (TSTR("yaffs_mknod: parent object %d type %d\n"),
+                       parent->objectId, parent->variantType));
+       } else {
+               T(YAFFS_TRACE_OS,
+                       (TSTR("yaffs_mknod: could not get parent object\n")));
+               return -EPERM;
+       }
+
+       T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making oject for %s, "
+                       "mode %x dev %x\n"),
+                       dentry->d_name.name, mode, rdev));
+
+       dev = parent->myDev;
+
+       yaffs_GrossLock(dev);
+
+       switch (mode & S_IFMT) {
+       default:
+               /* Special (socket, fifo, device...) */
+               T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making special\n")));
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+               obj = yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
+                               gid, old_encode_dev(rdev));
+#else
+               obj = yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
+                               gid, rdev);
+#endif
+               break;
+       case S_IFREG:           /* file          */
+               T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making file\n")));
+               obj = yaffs_MknodFile(parent, dentry->d_name.name, mode, uid,
+                               gid);
+               break;
+       case S_IFDIR:           /* directory */
+               T(YAFFS_TRACE_OS,
+                       (TSTR("yaffs_mknod: making directory\n")));
+               obj = yaffs_MknodDirectory(parent, dentry->d_name.name, mode,
+                                       uid, gid);
+               break;
+       case S_IFLNK:           /* symlink */
+               T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making symlink\n")));
+               obj = NULL;     /* Do we ever get here? */
+               break;
+       }
+
+       /* Can not call yaffs_get_inode() with gross lock held */
+       yaffs_GrossUnlock(dev);
+
+       if (obj) {
+               inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
+               d_instantiate(dentry, inode);
+               update_dir_time(dir);
+               T(YAFFS_TRACE_OS,
+                       (TSTR("yaffs_mknod created object %d count = %d\n"),
+                       obj->objectId, atomic_read(&inode->i_count)));
+               error = 0;
+               yaffs_FillInodeFromObject(dir,parent);
+       } else {
+               T(YAFFS_TRACE_OS,
+                       (TSTR("yaffs_mknod failed making object\n")));
+               error = -ENOMEM;
+       }
+
+       return error;
+}
+
+static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+{
+       int retVal;
+       T(YAFFS_TRACE_OS, (TSTR("yaffs_mkdir\n")));
+       retVal = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
+       return retVal;
+}
+
+#if (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
+{
+       T(YAFFS_TRACE_OS,(TSTR("yaffs_create\n")));
+       return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
+}
+
+static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
+{
+       int retVal;
+
+       yaffs_Device *dev;
+       yaffs_Object *obj;
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_unlink %d:%s\n"),
+               (int)(dir->i_ino),
+               dentry->d_name.name));
+       obj = yaffs_InodeToObject(dir);
+       dev = obj->myDev;
+
+       yaffs_GrossLock(dev);
+
+       retVal = yaffs_Unlink(obj, dentry->d_name.name);
+
+       if (retVal == YAFFS_OK) {
+               dentry->d_inode->i_nlink--;
+               dir->i_version++;
+               yaffs_GrossUnlock(dev);
+               mark_inode_dirty(dentry->d_inode);
+               update_dir_time(dir);
+               return 0;
+       }
+       yaffs_GrossUnlock(dev);
+       return -ENOTEMPTY;
+}
+
+/*
+ * Create a link...
+ */
+static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
+                       struct dentry *dentry)
+{
+       struct inode *inode = old_dentry->d_inode;
+       yaffs_Object *obj = NULL;
+       yaffs_Object *link = NULL;
+       yaffs_Device *dev;
+
+       T(YAFFS_TRACE_OS, (TSTR("yaffs_link\n")));
+
+       obj = yaffs_InodeToObject(inode);
+       dev = obj->myDev;
+
+       yaffs_GrossLock(dev);
+
+       if (!S_ISDIR(inode->i_mode))            /* Don't link directories */
+               link = yaffs_Link(yaffs_InodeToObject(dir), dentry->d_name.name,
+                       obj);
+
+       if (link) {
+               old_dentry->d_inode->i_nlink = yaffs_GetObjectLinkCount(obj);
+               d_instantiate(dentry, old_dentry->d_inode);
+               atomic_inc(&old_dentry->d_inode->i_count);
+               T(YAFFS_TRACE_OS,
+                       (TSTR("yaffs_link link count %d i_count %d\n"),
+                       old_dentry->d_inode->i_nlink,
+                       atomic_read(&old_dentry->d_inode->i_count)));
+       }
+
+       yaffs_GrossUnlock(dev);
+
+       if (link){
+               update_dir_time(dir);
+               return 0;
+       }
+
+       return -EPERM;
+}
+
+static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
+                               const char *symname)
+{
+       yaffs_Object *obj;
+       yaffs_Device *dev;
+       uid_t uid = YCRED(current)->fsuid;
+       gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
+
+       T(YAFFS_TRACE_OS, (TSTR("yaffs_symlink\n")));
+
+       dev = yaffs_InodeToObject(dir)->myDev;
+       yaffs_GrossLock(dev);
+       obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
+                               S_IFLNK | S_IRWXUGO, uid, gid, symname);
+       yaffs_GrossUnlock(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);
+               T(YAFFS_TRACE_OS, (TSTR("symlink created OK\n")));
+               return 0;
+       } else {
+               T(YAFFS_TRACE_OS, (TSTR("symlink not created\n")));
+       }
+
+       return -ENOMEM;
+}
+
+#if (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
+{
+
+       yaffs_Object *obj;
+       yaffs_Device *dev;
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
+       struct dentry *dentry = file->f_path.dentry;
+#endif
+
+       obj = yaffs_DentryToObject(dentry);
+
+       dev = obj->myDev;
+
+       T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
+               (TSTR("yaffs_sync_object\n")));
+       yaffs_GrossLock(dev);
+       yaffs_FlushFile(obj, 1, datasync);
+       yaffs_GrossUnlock(dev);
+       return 0;
+}
+
+/*
+ * 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)
+{
+       yaffs_Device *dev;
+       int retVal = YAFFS_FAIL;
+       yaffs_Object *target;
+
+       T(YAFFS_TRACE_OS, (TSTR("yaffs_rename\n")));
+       dev = yaffs_InodeToObject(old_dir)->myDev;
+
+       yaffs_GrossLock(dev);
+
+       /* Check if the target is an existing directory that is not empty. */
+       target = yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),
+                               new_dentry->d_name.name);
+
+
+
+       if (target && target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
+               !ylist_empty(&target->variant.directoryVariant.children)) {
+
+               T(YAFFS_TRACE_OS, (TSTR("target is non-empty dir\n")));
+
+               retVal = YAFFS_FAIL;
+       } else {
+               /* Now does unlinking internally using shadowing mechanism */
+               T(YAFFS_TRACE_OS, (TSTR("calling yaffs_RenameObject\n")));
+
+               retVal = yaffs_RenameObject(yaffs_InodeToObject(old_dir),
+                               old_dentry->d_name.name,
+                               yaffs_InodeToObject(new_dir),
+                               new_dentry->d_name.name);
+       }
+       yaffs_GrossUnlock(dev);
+
+       if (retVal == YAFFS_OK) {
+               if (target) {
+                       new_dentry->d_inode->i_nlink--;
+                       mark_inode_dirty(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_setattr(struct dentry *dentry, struct iattr *attr)
+{
+       struct inode *inode = dentry->d_inode;
+       int error = 0;
+       yaffs_Device *dev;
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_setattr of object %d\n"),
+               yaffs_InodeToObject(inode)->objectId));
+
+       /* Fail if a requested resize >= 2GB */         
+       if (attr->ia_valid & ATTR_SIZE &&
+               (attr->ia_size >> 31))
+               error = -EINVAL;
+
+       if (error == 0)
+               error = inode_change_ok(inode, attr);
+       if (error == 0) {
+               int result;
+               if (!error){
+                       error = yaffs_vfs_setattr(inode, attr);
+                       T(YAFFS_TRACE_OS,(TSTR("inode_setattr called\n")));
+                       if (attr->ia_valid & ATTR_SIZE){
+                               yaffs_vfs_setsize(inode,attr->ia_size);
+                               inode->i_blocks = (inode->i_size + 511) >> 9;
+                       }
+               }
+               dev = yaffs_InodeToObject(inode)->myDev;
+               if (attr->ia_valid & ATTR_SIZE){
+                       T(YAFFS_TRACE_OS,(TSTR("resize to %d(%x)\n"),
+                               (int)(attr->ia_size),(int)(attr->ia_size)));
+               }
+               yaffs_GrossLock(dev);
+               result = yaffs_SetAttributes(yaffs_InodeToObject(inode), attr);
+               if(result == YAFFS_OK) {
+                       error = 0;
+               } else {
+                       error = -EPERM;
+               }
+               yaffs_GrossUnlock(dev);
+
+       }
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_setattr done returning %d\n"),error));
+
+       return error;
+}
+
+#ifdef CONFIG_YAFFS_XATTR
+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;
+       yaffs_Device *dev;
+       yaffs_Object *obj = yaffs_InodeToObject(inode);
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_setxattr of object %d\n"),
+               obj->objectId));
+
+
+       if (error == 0) {
+               int result;
+               dev = obj->myDev;
+               yaffs_GrossLock(dev);
+               result = yaffs_SetXAttribute(obj, name, value, size, flags);
+               if(result == YAFFS_OK)
+                       error = 0;
+               else if(result < 0)
+                       error = result;
+               yaffs_GrossUnlock(dev);
+
+       }
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_setxattr done returning %d\n"),error));
+
+       return error;
+}
+
+
+ssize_t yaffs_getxattr(struct dentry *dentry, const char *name, void *buff,
+                       size_t size)
+{
+       struct inode *inode = dentry->d_inode;
+       int error = 0;
+       yaffs_Device *dev;
+       yaffs_Object *obj = yaffs_InodeToObject(inode);
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_getxattr \"%s\" from object %d\n"),
+               name, obj->objectId));
+
+       if (error == 0) {
+               dev = obj->myDev;
+               yaffs_GrossLock(dev);
+               error = yaffs_GetXAttribute(obj, name, buff, size);
+               yaffs_GrossUnlock(dev);
+
+       }
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_getxattr done returning %d\n"),error));
+
+       return error;
+}
+
+int yaffs_removexattr(struct dentry *dentry, const char *name)
+{
+       struct inode *inode = dentry->d_inode;
+       int error = 0;
+       yaffs_Device *dev;
+       yaffs_Object *obj = yaffs_InodeToObject(inode);
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_removexattr of object %d\n"),
+               obj->objectId));
+
+
+       if (error == 0) {
+               int result;
+               dev = obj->myDev;
+               yaffs_GrossLock(dev);
+               result = yaffs_RemoveXAttribute(obj, name);
+               if(result == YAFFS_OK)
+                       error = 0;
+               else if(result < 0)
+                       error = result;
+               yaffs_GrossUnlock(dev);
+
+       }
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_removexattr done returning %d\n"),error));
+
+       return error;
+}
+
+ssize_t yaffs_listxattr(struct dentry *dentry, char *buff, size_t size)
+{
+       struct inode *inode = dentry->d_inode;
+       int error = 0;
+       yaffs_Device *dev;
+       yaffs_Object *obj = yaffs_InodeToObject(inode);
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_listxattr of object %d\n"),
+               obj->objectId));
+
+
+       if (error == 0) {
+               dev = obj->myDev;
+               yaffs_GrossLock(dev);
+               error = yaffs_ListXAttributes(obj, buff, size);
+               yaffs_GrossUnlock(dev);
+
+       }
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_listxattr done returning %d\n"),error));
+
+       return error;
+}
+
+#endif
+
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+       yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
+       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)
+{
+       yaffs_Device *dev = yaffs_SuperToDevice(sb);
+#else
+static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
+{
+       yaffs_Device *dev = yaffs_SuperToDevice(sb);
+#endif
+
+       T(YAFFS_TRACE_OS, (TSTR("yaffs_statfs\n")));
+
+       yaffs_GrossLock(dev);
+
+       buf->f_type = YAFFS_MAGIC;
+       buf->f_bsize = sb->s_blocksize;
+       buf->f_namelen = 255;
+
+       if (dev->nDataBytesPerChunk & (dev->nDataBytesPerChunk - 1)) {
+               /* Do this if chunk size is not a power of 2 */
+
+               uint64_t bytesInDev;
+               uint64_t bytesFree;
+
+               bytesInDev = ((uint64_t)((dev->param.endBlock - dev->param.startBlock + 1))) *
+                       ((uint64_t)(dev->param.nChunksPerBlock * dev->nDataBytesPerChunk));
+
+               do_div(bytesInDev, sb->s_blocksize); /* bytesInDev becomes the number of blocks */
+               buf->f_blocks = bytesInDev;
+
+               bytesFree  = ((uint64_t)(yaffs_GetNumberOfFreeChunks(dev))) *
+                       ((uint64_t)(dev->nDataBytesPerChunk));
+
+               do_div(bytesFree, sb->s_blocksize);
+
+               buf->f_bfree = bytesFree;
+
+       } else if (sb->s_blocksize > dev->nDataBytesPerChunk) {
+
+               buf->f_blocks =
+                       (dev->param.endBlock - dev->param.startBlock + 1) *
+                       dev->param.nChunksPerBlock /
+                       (sb->s_blocksize / dev->nDataBytesPerChunk);
+               buf->f_bfree =
+                       yaffs_GetNumberOfFreeChunks(dev) /
+                       (sb->s_blocksize / dev->nDataBytesPerChunk);
+       } else {
+               buf->f_blocks =
+                       (dev->param.endBlock - dev->param.startBlock + 1) *
+                       dev->param.nChunksPerBlock *
+                       (dev->nDataBytesPerChunk / sb->s_blocksize);
+
+               buf->f_bfree =
+                       yaffs_GetNumberOfFreeChunks(dev) *
+                       (dev->nDataBytesPerChunk / sb->s_blocksize);
+       }
+
+       buf->f_files = 0;
+       buf->f_ffree = 0;
+       buf->f_bavail = buf->f_bfree;
+
+       yaffs_GrossUnlock(dev);
+       return 0;
+}
+
+
+
+static void yaffs_FlushInodes(struct super_block *sb)
+{
+       struct inode *iptr;
+       yaffs_Object *obj;
+       
+       list_for_each_entry(iptr,&sb->s_inodes, i_sb_list){
+               obj = yaffs_InodeToObject(iptr);
+               if(obj){
+                       T(YAFFS_TRACE_OS, (TSTR("flushing obj %d\n"),
+                               obj->objectId));
+                       yaffs_FlushFile(obj,1,0);
+               }
+       }
+}
+
+
+static void yaffs_FlushSuperBlock(struct super_block *sb, int do_checkpoint)
+{
+       yaffs_Device *dev = yaffs_SuperToDevice(sb);    
+       if(!dev)
+               return;
+       
+       yaffs_FlushInodes(sb);
+       yaffs_UpdateDirtyDirectories(dev);
+       yaffs_FlushEntireDeviceCache(dev);
+       if(do_checkpoint)
+               yaffs_CheckpointSave(dev);
+}
+
+
+static unsigned yaffs_bg_gc_urgency(yaffs_Device *dev)
+{
+       unsigned erasedChunks = dev->nErasedBlocks * dev->param.nChunksPerBlock;
+       struct yaffs_LinuxContext *context = yaffs_DeviceToLC(dev);
+       unsigned scatteredFree = 0; /* Free chunks not in an erased block */
+
+       if(erasedChunks < dev->nFreeChunks)
+               scatteredFree = (dev->nFreeChunks - erasedChunks);
+
+       if(!context->bgRunning)
+               return 0;
+       else if(scatteredFree < (dev->param.nChunksPerBlock * 2))
+               return 0;
+       else if(erasedChunks > dev->nFreeChunks/2)
+               return 0;
+       else if(erasedChunks > dev->nFreeChunks/4)
+               return 1;
+       else
+               return 2;
+}
+
+static int yaffs_do_sync_fs(struct super_block *sb,
+                               int request_checkpoint)
+{
+
+       yaffs_Device *dev = yaffs_SuperToDevice(sb);
+       unsigned int oneshot_checkpoint = (yaffs_auto_checkpoint & 4);
+       unsigned gc_urgent = yaffs_bg_gc_urgency(dev);
+       int do_checkpoint;
+
+       T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
+               (TSTR("yaffs_do_sync_fs: gc-urgency %d %s %s%s\n"),
+               gc_urgent,
+               sb->s_dirt ? "dirty" : "clean",
+               request_checkpoint ? "checkpoint requested" : "no checkpoint",
+               oneshot_checkpoint ? " one-shot" : "" ));
+
+       yaffs_GrossLock(dev);
+       do_checkpoint = ((request_checkpoint && !gc_urgent) ||
+                       oneshot_checkpoint) &&
+                       !dev->isCheckpointed;
+
+       if (sb->s_dirt || do_checkpoint) {
+               yaffs_FlushSuperBlock(sb, !dev->isCheckpointed && do_checkpoint);
+               sb->s_dirt = 0;
+               if(oneshot_checkpoint)
+                       yaffs_auto_checkpoint &= ~4;
+       }
+       yaffs_GrossUnlock(dev);
+
+       return 0;
+}
+
+/*
+ * yaffs background thread functions .
+ * yaffs_BackgroundThread() the thread function
+ * yaffs_BackgroundStart() launches the background thread.
+ * yaffs_BackgroundStop() 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.
+ */
+
+#ifdef YAFFS_COMPILE_BACKGROUND
+
+void yaffs_background_waker(unsigned long data)
+{
+       wake_up_process((struct task_struct *)data);
+}
+
+static int yaffs_BackgroundThread(void *data)
+{
+       yaffs_Device *dev = (yaffs_Device *)data;
+       struct yaffs_LinuxContext *context = yaffs_DeviceToLC(dev);
+       unsigned long now = jiffies;
+       unsigned long next_dir_update = now;
+       unsigned long next_gc = now;
+       unsigned long expires;
+       unsigned int urgency;
+
+       int gcResult;
+       struct timer_list timer;
+
+       T(YAFFS_TRACE_BACKGROUND,
+               (TSTR("yaffs_background starting for dev %p\n"),
+               (void *)dev));
+
+#ifdef YAFFS_COMPILE_FREEZER
+       set_freezable();
+#endif
+       while(context->bgRunning){
+               T(YAFFS_TRACE_BACKGROUND,
+                       (TSTR("yaffs_background\n")));
+
+               if(kthread_should_stop())
+                       break;
+
+#ifdef YAFFS_COMPILE_FREEZER
+               if(try_to_freeze())
+                       continue;
+#endif
+               yaffs_GrossLock(dev);
+
+               now = jiffies;
+
+               if(time_after(now, next_dir_update) && yaffs_bg_enable){
+                       yaffs_UpdateDirtyDirectories(dev);
+                       next_dir_update = now + HZ;
+               }
+
+               if(time_after(now,next_gc) && yaffs_bg_enable){
+                       if(!dev->isCheckpointed){
+                               urgency = yaffs_bg_gc_urgency(dev);
+                               gcResult = yaffs_BackgroundGarbageCollect(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_GrossUnlock(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_BackgroundStart(yaffs_Device *dev)
+{
+       int retval = 0;
+       struct yaffs_LinuxContext *context = yaffs_DeviceToLC(dev);
+
+       if(dev->readOnly)
+               return -1;
+
+       context->bgRunning = 1;
+
+       context->bgThread = kthread_run(yaffs_BackgroundThread,
+                               (void *)dev,"yaffs-bg-%d",context->mount_id);
+
+       if(IS_ERR(context->bgThread)){
+               retval = PTR_ERR(context->bgThread);
+               context->bgThread = NULL;
+               context->bgRunning = 0;
+       }
+       return retval;
+}
+
+static void yaffs_BackgroundStop(yaffs_Device *dev)
+{
+       struct yaffs_LinuxContext *ctxt = yaffs_DeviceToLC(dev);
+
+       ctxt->bgRunning = 0;
+
+       if( ctxt->bgThread){
+               kthread_stop(ctxt->bgThread);
+               ctxt->bgThread = NULL;
+       }
+}
+#else
+static int yaffs_BackgroundThread(void *data)
+{
+       return 0;
+}
+
+static int yaffs_BackgroundStart(yaffs_Device *dev)
+{
+       return 0;
+}
+
+static void yaffs_BackgroundStop(yaffs_Device *dev)
+{
+}
+#endif
+
+
+#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);
+
+       T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
+               (TSTR("yaffs_write_super%s\n"),
+               request_checkpoint ? " checkpt" : ""));
+
+       yaffs_do_sync_fs(sb, request_checkpoint);
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18))
+       return 0;
+#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);
+
+       T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
+               (TSTR("yaffs_sync_fs%s\n"),
+               request_checkpoint ? " checkpt" : ""));
+
+       yaffs_do_sync_fs(sb, request_checkpoint);
+
+       return 0;
+}
+
+#ifdef YAFFS_USE_OWN_IGET
+
+static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
+{
+       struct inode *inode;
+       yaffs_Object *obj;
+       yaffs_Device *dev = yaffs_SuperToDevice(sb);
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_iget for %lu\n"), 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_GrossLock(dev);
+
+       obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
+
+       yaffs_FillInodeFromObject(inode, obj);
+
+       yaffs_GrossUnlock(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.
+        */
+
+       yaffs_Object *obj;
+       yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_read_inode for %d\n"), (int)inode->i_ino));
+
+       if(current != yaffs_DeviceToLC(dev)->readdirProcess)
+               yaffs_GrossLock(dev);
+
+       obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
+
+       yaffs_FillInodeFromObject(inode, obj);
+
+       if(current != yaffs_DeviceToLC(dev)->readdirProcess)
+               yaffs_GrossUnlock(dev);
+}
+
+#endif
+
+static YLIST_HEAD(yaffs_context_list);
+struct semaphore yaffs_context_lock;
+
+static void yaffs_put_super(struct super_block *sb)
+{
+       yaffs_Device *dev = yaffs_SuperToDevice(sb);
+
+       T(YAFFS_TRACE_OS, (TSTR("yaffs_put_super\n")));
+
+       T(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
+               (TSTR("Shutting down yaffs background thread\n")));
+       yaffs_BackgroundStop(dev);
+       T(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
+               (TSTR("yaffs background thread shut down\n")));
+
+       yaffs_GrossLock(dev);
+
+       yaffs_FlushSuperBlock(sb,1);
+
+       if (yaffs_DeviceToLC(dev)->putSuperFunc)
+               yaffs_DeviceToLC(dev)->putSuperFunc(sb);
+
+
+       yaffs_Deinitialise(dev);
+
+       yaffs_GrossUnlock(dev);
+
+       down(&yaffs_context_lock);
+       ylist_del_init(&(yaffs_DeviceToLC(dev)->contextList));
+       up(&yaffs_context_lock);
+
+       if (yaffs_DeviceToLC(dev)->spareBuffer) {
+               YFREE(yaffs_DeviceToLC(dev)->spareBuffer);
+               yaffs_DeviceToLC(dev)->spareBuffer = NULL;
+       }
+
+       kfree(dev);
+}
+
+
+static void yaffs_MTDPutSuper(struct super_block *sb)
+{
+       struct mtd_info *mtd = yaffs_DeviceToMtd(yaffs_SuperToDevice(sb));
+
+       if (mtd->sync)
+               mtd->sync(mtd);
+
+       put_mtd_device(mtd);
+}
+
+
+static void yaffs_MarkSuperBlockDirty(yaffs_Device *dev)
+{
+       struct super_block *sb = yaffs_DeviceToLC(dev)->superBlock;
+
+       T(YAFFS_TRACE_OS, (TSTR("yaffs_MarkSuperBlockDirty() sb = %p\n"), sb));
+       if (sb)
+               sb->s_dirt = 1;
+}
+
+typedef struct {
+       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;
+} yaffs_options;
+
+#define MAX_OPT_LEN 30
+static int yaffs_parse_options(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, "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 super_block *yaffs_internal_read_super(int yaffsVersion,
+                                               struct super_block *sb,
+                                               void *data, int silent)
+{
+       int nBlocks;
+       struct inode *inode = NULL;
+       struct dentry *root;
+       yaffs_Device *dev = 0;
+       char devname_buf[BDEVNAME_SIZE + 1];
+       struct mtd_info *mtd;
+       int err;
+       char *data_str = (char *)data;
+       struct yaffs_LinuxContext *context = NULL;
+       yaffs_DeviceParam *param;
+
+       int readOnly = 0;
+
+       yaffs_options options;
+
+       unsigned mount_id;
+       int found;
+       struct yaffs_LinuxContext *context_iterator;
+       struct ylist_head *l;
+
+       sb->s_magic = YAFFS_MAGIC;
+       sb->s_op = &yaffs_super_ops;
+       sb->s_flags |= MS_NOATIME;
+
+       readOnly =((sb->s_flags & MS_RDONLY) != 0);
+
+
+#ifdef YAFFS_COMPILE_EXPORTFS
+       sb->s_export_op = &yaffs_export_ops;
+#endif
+
+       if (!sb)
+               printk(KERN_INFO "yaffs: sb is NULL\n");
+       else 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),
+                      readOnly ? "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;
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_read_super: Using yaffs%d\n"), yaffsVersion));
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_read_super: block size %d\n"),
+               (int)(sb->s_blocksize)));
+
+       T(YAFFS_TRACE_ALWAYS,
+               (TSTR("yaffs: Attempting MTD mount of %u.%u,\"%s\"\n"),
+              MAJOR(sb->s_dev), MINOR(sb->s_dev),
+              yaffs_devname(sb, devname_buf)));
+
+       /* Check it's an mtd device..... */
+       if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
+               return NULL;    /* This isn't an mtd device */
+
+       /* Get the device */
+       mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
+       if (!mtd) {
+               T(YAFFS_TRACE_ALWAYS,
+                       (TSTR("yaffs: MTD device #%u doesn't appear to exist\n"),
+                       MINOR(sb->s_dev)));
+               return NULL;
+       }
+       /* Check it's NAND */
+       if (mtd->type != MTD_NANDFLASH) {
+               T(YAFFS_TRACE_ALWAYS,
+                       (TSTR("yaffs: MTD device is not NAND it's type %d\n"),
+                       mtd->type));
+               return NULL;
+       }
+
+       T(YAFFS_TRACE_OS, (TSTR(" erase %p\n"), mtd->erase));
+       T(YAFFS_TRACE_OS, (TSTR(" read %p\n"), mtd->read));
+       T(YAFFS_TRACE_OS, (TSTR(" write %p\n"), mtd->write));
+       T(YAFFS_TRACE_OS, (TSTR(" readoob %p\n"), mtd->read_oob));
+       T(YAFFS_TRACE_OS, (TSTR(" writeoob %p\n"), mtd->write_oob));
+       T(YAFFS_TRACE_OS, (TSTR(" block_isbad %p\n"), mtd->block_isbad));
+       T(YAFFS_TRACE_OS, (TSTR(" block_markbad %p\n"), mtd->block_markbad));
+       T(YAFFS_TRACE_OS, (TSTR(" %s %d\n"), WRITE_SIZE_STR, WRITE_SIZE(mtd)));
+       T(YAFFS_TRACE_OS, (TSTR(" oobsize %d\n"), mtd->oobsize));
+       T(YAFFS_TRACE_OS, (TSTR(" erasesize %d\n"), mtd->erasesize));
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
+       T(YAFFS_TRACE_OS, (TSTR(" size %u\n"), mtd->size));
+#else
+       T(YAFFS_TRACE_OS, (TSTR(" size %lld\n"), mtd->size));
+#endif
+
+#ifdef CONFIG_YAFFS_AUTO_YAFFS2
+
+       if (yaffsVersion == 1 && WRITE_SIZE(mtd) >= 2048) {
+               T(YAFFS_TRACE_ALWAYS,
+                       (TSTR("yaffs: auto selecting yaffs2\n")));
+               yaffsVersion = 2;
+       }
+
+       /* Added NCB 26/5/2006 for completeness */
+       if (yaffsVersion == 2 && !options.inband_tags && WRITE_SIZE(mtd) == 512) {
+               T(YAFFS_TRACE_ALWAYS,
+                       (TSTR("yaffs: auto selecting yaffs1\n")));
+               yaffsVersion = 1;
+       }
+
+#endif
+
+       if (yaffsVersion == 2) {
+               /* Check for version 2 style functions */
+               if (!mtd->erase ||
+                   !mtd->block_isbad ||
+                   !mtd->block_markbad ||
+                   !mtd->read ||
+                   !mtd->write ||
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+                   !mtd->read_oob || !mtd->write_oob) {
+#else
+                   !mtd->write_ecc ||
+                   !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
+#endif
+                       T(YAFFS_TRACE_ALWAYS,
+                         (TSTR("yaffs: MTD device does not support required "
+                          "functions\n")));
+                       return NULL;
+               }
+
+               if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
+                   mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
+                   !options.inband_tags) {
+                       T(YAFFS_TRACE_ALWAYS,
+                         (TSTR("yaffs: MTD device does not have the "
+                          "right page sizes\n")));
+                       return NULL;
+               }
+       } else {
+               /* Check for V1 style functions */
+               if (!mtd->erase ||
+                   !mtd->read ||
+                   !mtd->write ||
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+                   !mtd->read_oob || !mtd->write_oob) {
+#else
+                   !mtd->write_ecc ||
+                   !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
+#endif
+                       T(YAFFS_TRACE_ALWAYS,
+                         (TSTR("yaffs: MTD device does not support required "
+                          "functions\n")));
+                       return NULL;
+               }
+
+               if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
+                   mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
+                       T(YAFFS_TRACE_ALWAYS,
+                         (TSTR("yaffs: MTD device does not support have the "
+                          "right page sizes\n")));
+                       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 yaffs_Device up for mtd
+        */
+
+       if (!readOnly && !(mtd->flags & MTD_WRITEABLE)){
+               readOnly = 1;
+               printk(KERN_INFO "yaffs: mtd is read only, setting superblock read only");
+               sb->s_flags |= MS_RDONLY;
+       }
+
+       dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
+       context = kmalloc(sizeof(struct yaffs_LinuxContext),GFP_KERNEL);
+       
+       if(!dev || !context ){
+               if(dev)
+                       kfree(dev);
+               if(context)
+                       kfree(context);
+               dev = NULL;
+               context = NULL;
+       }
+
+       if (!dev) {
+               /* Deep shit could not allocate device structure */
+               T(YAFFS_TRACE_ALWAYS,
+                 (TSTR("yaffs_read_super: Failed trying to allocate "
+                  "yaffs_Device. \n")));
+               return NULL;
+       }
+       memset(dev, 0, sizeof(yaffs_Device));
+       param = &(dev->param);
+
+       memset(context,0,sizeof(struct yaffs_LinuxContext));
+       dev->osContext = context;
+       YINIT_LIST_HEAD(&(context->contextList));
+       context->dev = dev;
+       context->superBlock = sb;
+
+       dev->readOnly = readOnly;
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+       sb->s_fs_info = dev;
+#else
+       sb->u.generic_sbp = dev;
+#endif
+       
+       dev->driverContext = mtd;
+       param->name = mtd->name;
+
+       /* Set up the memory size parameters.... */
+
+       nBlocks = YCALCBLOCKS(mtd->size, (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK));
+
+       param->startBlock = 0;
+       param->endBlock = nBlocks - 1;
+       param->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
+       param->totalBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
+       param->nReservedBlocks = 5;
+       param->nShortOpCaches = (options.no_cache) ? 0 : 10;
+       param->inbandTags = options.inband_tags;
+
+#ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
+       param->disableLazyLoad = 1;
+#endif
+#ifdef CONFIG_YAFFS_XATTR
+       param->enableXattr = 1;
+#endif
+       if(options.lazy_loading_overridden)
+               param->disableLazyLoad = !options.lazy_loading_enabled;
+
+#ifdef CONFIG_YAFFS_DISABLE_TAGS_ECC
+       param->noTagsECC = 1;
+#endif
+
+#ifdef CONFIG_YAFFS_DISABLE_BACKGROUND
+#else
+       param->deferDirectoryUpdate = 1;
+#endif
+
+       if(options.tags_ecc_overridden)
+               param->noTagsECC = !options.tags_ecc_on;
+
+#ifdef CONFIG_YAFFS_EMPTY_LOST_AND_FOUND
+       param->emptyLostAndFound = 1;
+#endif
+
+#ifdef CONFIG_YAFFS_DISABLE_BLOCK_REFRESHING
+       param->refreshPeriod = 0;
+#else
+       param->refreshPeriod = 500;
+#endif
+
+       if(options.empty_lost_and_found_overridden)
+               param->emptyLostAndFound = options.empty_lost_and_found;
+
+       /* ... and the functions. */
+       if (yaffsVersion == 2) {
+               param->writeChunkWithTagsToNAND =
+                   nandmtd2_WriteChunkWithTagsToNAND;
+               param->readChunkWithTagsFromNAND =
+                   nandmtd2_ReadChunkWithTagsFromNAND;
+               param->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
+               param->queryNANDBlock = nandmtd2_QueryNANDBlock;
+               yaffs_DeviceToLC(dev)->spareBuffer = YMALLOC(mtd->oobsize);
+               param->isYaffs2 = 1;
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+               param->totalBytesPerChunk = mtd->writesize;
+               param->nChunksPerBlock = mtd->erasesize / mtd->writesize;
+#else
+               param->totalBytesPerChunk = mtd->oobblock;
+               param->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
+#endif
+               nBlocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
+
+               param->startBlock = 0;
+               param->endBlock = nBlocks - 1;
+       } else {
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+               /* use the MTD interface in yaffs_mtdif1.c */
+               param->writeChunkWithTagsToNAND =
+                       nandmtd1_WriteChunkWithTagsToNAND;
+               param->readChunkWithTagsFromNAND =
+                       nandmtd1_ReadChunkWithTagsFromNAND;
+               param->markNANDBlockBad = nandmtd1_MarkNANDBlockBad;
+               param->queryNANDBlock = nandmtd1_QueryNANDBlock;
+#else
+               param->writeChunkToNAND = nandmtd_WriteChunkToNAND;
+               param->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
+#endif
+               param->isYaffs2 = 0;
+       }
+       /* ... and common functions */
+       param->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
+       param->initialiseNAND = nandmtd_InitialiseNAND;
+
+       yaffs_DeviceToLC(dev)->putSuperFunc = yaffs_MTDPutSuper;
+
+       param->markSuperBlockDirty = yaffs_MarkSuperBlockDirty;
+       param->gcControl = yaffs_gc_control_callback;
+
+       yaffs_DeviceToLC(dev)->superBlock= sb;
+       
+
+#ifndef CONFIG_YAFFS_DOES_ECC
+       param->useNANDECC = 1;
+#endif
+
+#ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES
+       param->wideTnodesDisabled = 1;
+#endif
+
+       param->skipCheckpointRead = options.skip_checkpoint_read;
+       param->skipCheckpointWrite = options.skip_checkpoint_write;
+
+       down(&yaffs_context_lock);
+       /* Get a mount id */
+       found = 0;
+       for(mount_id=0; ! found; mount_id++){
+               found = 1;
+               ylist_for_each(l,&yaffs_context_list){
+                       context_iterator = ylist_entry(l,struct yaffs_LinuxContext,contextList);
+                       if(context_iterator->mount_id == mount_id)
+                               found = 0;
+               }
+       }
+       context->mount_id = mount_id;
+
+       ylist_add_tail(&(yaffs_DeviceToLC(dev)->contextList), &yaffs_context_list);
+       up(&yaffs_context_lock);
+
+        /* Directory search handling...*/
+        YINIT_LIST_HEAD(&(yaffs_DeviceToLC(dev)->searchContexts));
+        param->removeObjectCallback = yaffs_RemoveObjectCallback;
+
+       init_MUTEX(&(yaffs_DeviceToLC(dev)->grossLock));
+
+       yaffs_GrossLock(dev);
+
+       err = yaffs_GutsInitialise(dev);
+
+       T(YAFFS_TRACE_OS,
+         (TSTR("yaffs_read_super: guts initialised %s\n"),
+          (err == YAFFS_OK) ? "OK" : "FAILED"));
+          
+       if(err == YAFFS_OK)
+               yaffs_BackgroundStart(dev);
+               
+       if(!context->bgThread)
+               param->deferDirectoryUpdate = 0;
+
+
+       /* Release lock before yaffs_get_inode() */
+       yaffs_GrossUnlock(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;
+
+       T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: got root inode\n")));
+
+       root = d_alloc_root(inode);
+
+       T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: d_alloc_root done\n")));
+
+       if (!root) {
+               iput(inode);
+               return NULL;
+       }
+       sb->s_root = root;
+       sb->s_dirt = !dev->isCheckpointed;
+       T(YAFFS_TRACE_ALWAYS,
+               (TSTR("yaffs_read_super: isCheckpointed %d\n"),
+               dev->isCheckpointed));
+
+       T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: done\n")));
+       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, 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",
+       .get_sb = yaffs_read_super,
+       .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
+
+
+#ifdef CONFIG_YAFFS_YAFFS2
+
+#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, 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",
+       .get_sb = yaffs2_read_super,
+       .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
+
+#endif                         /* CONFIG_YAFFS_YAFFS2 */
+
+static struct proc_dir_entry *my_proc_entry;
+static struct proc_dir_entry *debug_proc_entry;
+
+static char *yaffs_dump_dev_part0(char *buf, yaffs_Device * dev)
+{
+       buf += sprintf(buf, "startBlock......... %d\n", dev->param.startBlock);
+       buf += sprintf(buf, "endBlock........... %d\n", dev->param.endBlock);
+       buf += sprintf(buf, "totalBytesPerChunk. %d\n", dev->param.totalBytesPerChunk);
+       buf += sprintf(buf, "useNANDECC......... %d\n", dev->param.useNANDECC);
+       buf += sprintf(buf, "noTagsECC.......... %d\n", dev->param.noTagsECC);
+       buf += sprintf(buf, "isYaffs2........... %d\n", dev->param.isYaffs2);
+       buf += sprintf(buf, "inbandTags......... %d\n", dev->param.inbandTags);
+       buf += sprintf(buf, "emptyLostAndFound.. %d\n", dev->param.emptyLostAndFound);
+       buf += sprintf(buf, "disableLazyLoad.... %d\n", dev->param.disableLazyLoad);
+       buf += sprintf(buf, "refreshPeriod...... %d\n", dev->param.refreshPeriod);
+       buf += sprintf(buf, "nShortOpCaches..... %d\n", dev->param.nShortOpCaches);
+       buf += sprintf(buf, "nReservedBlocks.... %d\n", dev->param.nReservedBlocks);
+
+       buf += sprintf(buf, "\n");
+
+       return buf;
+}
+
+
+static char *yaffs_dump_dev_part1(char *buf, yaffs_Device * dev)
+{
+       buf += sprintf(buf, "nDataBytesPerChunk. %d\n", dev->nDataBytesPerChunk);
+       buf += sprintf(buf, "chunkGroupBits..... %d\n", dev->chunkGroupBits);
+       buf += sprintf(buf, "chunkGroupSize..... %d\n", dev->chunkGroupSize);
+       buf += sprintf(buf, "nErasedBlocks...... %d\n", dev->nErasedBlocks);
+       buf += sprintf(buf, "blocksInCheckpoint. %d\n", dev->blocksInCheckpoint);
+       buf += sprintf(buf, "\n");
+       buf += sprintf(buf, "nTnodes............ %d\n", dev->nTnodes);
+       buf += sprintf(buf, "nObjects........... %d\n", dev->nObjects);
+       buf += sprintf(buf, "nFreeChunks........ %d\n", dev->nFreeChunks);
+       buf += sprintf(buf, "\n");
+       buf += sprintf(buf, "nPageWrites........ %u\n", dev->nPageWrites);
+       buf += sprintf(buf, "nPageReads......... %u\n", dev->nPageReads);
+       buf += sprintf(buf, "nBlockErasures..... %u\n", dev->nBlockErasures);
+       buf += sprintf(buf, "nGCCopies.......... %u\n", dev->nGCCopies);
+       buf += sprintf(buf, "allGCs............. %u\n", dev->allGCs);
+       buf += sprintf(buf, "passiveGCs......... %u\n", dev->passiveGCs);
+       buf += sprintf(buf, "oldestDirtyGCs..... %u\n", dev->oldestDirtyGCs);
+       buf += sprintf(buf, "nGCBlocks.......... %u\n", dev->nGCBlocks);
+       buf += sprintf(buf, "backgroundGCs...... %u\n", dev->backgroundGCs);
+       buf += sprintf(buf, "nRetriedWrites..... %u\n", dev->nRetriedWrites);
+       buf += sprintf(buf, "nRetireBlocks...... %u\n", dev->nRetiredBlocks);
+       buf += sprintf(buf, "eccFixed........... %u\n", dev->eccFixed);
+       buf += sprintf(buf, "eccUnfixed......... %u\n", dev->eccUnfixed);
+       buf += sprintf(buf, "tagsEccFixed....... %u\n", dev->tagsEccFixed);
+       buf += sprintf(buf, "tagsEccUnfixed..... %u\n", dev->tagsEccUnfixed);
+       buf += sprintf(buf, "cacheHits.......... %u\n", dev->cacheHits);
+       buf += sprintf(buf, "nDeletedFiles...... %u\n", dev->nDeletedFiles);
+       buf += sprintf(buf, "nUnlinkedFiles..... %u\n", dev->nUnlinkedFiles);
+       buf += sprintf(buf, "refreshCount....... %u\n", dev->refreshCount);
+       buf +=
+           sprintf(buf, "nBackgroudDeletions %u\n", dev->nBackgroundDeletions);
+
+       return buf;
+}
+
+static int yaffs_proc_read(char *page,
+                          char **start,
+                          off_t offset, int count, int *eof, void *data)
+{
+       struct ylist_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 devList.
+        * 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;
+               
+               down(&yaffs_context_lock);
+
+               /* Locate and print the Nth entry.  Order N-squared but N is small. */
+               ylist_for_each(item, &yaffs_context_list) {
+                       struct yaffs_LinuxContext *dc = ylist_entry(item, struct yaffs_LinuxContext, contextList);
+                       yaffs_Device *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;
+               }
+               up(&yaffs_context_lock);
+       }
+
+       return buf - page < count ? buf - page : count;
+}
+
+static int yaffs_stats_proc_read(char *page,
+                               char **start,
+                               off_t offset, int count, int *eof, void *data)
+{
+       struct ylist_head *item;
+       char *buf = page;
+       int n = 0;
+
+       down(&yaffs_context_lock);
+
+       /* Locate and print the Nth entry.  Order N-squared but N is small. */
+       ylist_for_each(item, &yaffs_context_list) {
+               struct yaffs_LinuxContext *dc = ylist_entry(item, struct yaffs_LinuxContext, contextList);
+               yaffs_Device *dev = dc->dev;
+
+               int erasedChunks;
+
+               erasedChunks = dev->nErasedBlocks * dev->param.nChunksPerBlock;
+               
+               buf += sprintf(buf,"%d, %d, %d, %u, %u, %u, %u\n",
+                               n, dev->nFreeChunks, erasedChunks,
+                               dev->backgroundGCs, dev->oldestDirtyGCs,
+                               dev->nObjects, dev->nTnodes);
+       }
+       up(&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},
+       {"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_traceMask;
+
+       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_traceMask = rg | YAFFS_TRACE_ALWAYS;
+
+       printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_traceMask);
+
+       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;
+}
+
+
+static int yaffs_proc_write(struct file *file, const char *buf,
+                                        unsigned long count, void *data)
+{
+        return yaffs_proc_write_trace_options(file, buf, count, data);
+}
+
+/* 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;
+
+       T(YAFFS_TRACE_ALWAYS,
+         (TSTR("yaffs built " __DATE__ " " __TIME__ " Installing. \n")));
+
+#ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
+       T(YAFFS_TRACE_ALWAYS,
+         (TSTR(" \n\n\n\nYAFFS-WARNING CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED selected.\n\n\n\n")));
+#endif
+
+
+
+
+       init_MUTEX(&yaffs_context_lock);
+
+       /* 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;
+
+       debug_proc_entry = create_proc_entry("yaffs_stats",
+                                              S_IRUGO | S_IFREG,
+                                              YPROC_ROOT);
+
+       if (debug_proc_entry) {
+               debug_proc_entry->write_proc = NULL;
+               debug_proc_entry->read_proc = yaffs_stats_proc_read;
+               debug_proc_entry->data = NULL;
+       } else
+               return -ENOMEM;
+
+       /* 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;
+
+       T(YAFFS_TRACE_ALWAYS,
+               (TSTR("yaffs built " __DATE__ " " __TIME__ " removing. \n")));
+
+       remove_proc_entry("yaffs", YPROC_ROOT);
+       remove_proc_entry("yaffs_stats", YPROC_ROOT);
+
+       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., 2002-2010");
+MODULE_LICENSE("GPL");