[PATCH 09/10] Add yaffs2 file system: Linux glue code

[Charles Manning]

Signed-off-by: Charles Manning <cdhmanning@xxxxxxxxx>
---
 fs/yaffs2/yaffs_linux.h |   41 +
 fs/yaffs2/yaffs_vfs.c   | 2745 +++++++++++++++++++++++++++++++++++++++++++++++
 fs/yaffs2/yportenv.h    |   59 +
 3 files changed, 2845 insertions(+), 0 deletions(-)
 create mode 100644 fs/yaffs2/yaffs_linux.h
 create mode 100644 fs/yaffs2/yaffs_vfs.c
 create mode 100644 fs/yaffs2/yportenv.h

diff --git a/fs/yaffs2/yaffs_linux.h b/fs/yaffs2/yaffs_linux.h
new file mode 100644
index 0000000..8c522c8
--- /dev/null
+++ b/fs/yaffs2/yaffs_linux.h
@@ -0,0 +1,41 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@xxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_LINUX_H__
+#define __YAFFS_LINUX_H__
+
+#include "yportenv.h"
+
+struct yaffs_linux_context {
+	struct list_head context_list;	/* List of these we have mounted */
+	struct yaffs_dev *dev;
+	struct super_block *super;
+	struct task_struct *bg_thread;	/* Background thread for this device */
+	int bg_running;
+	struct mutex gross_lock;	/* Gross locking mutex*/
+	u8 *spare_buffer;	/* For mtdif2 use. Don't know the buffer size
+				 * at compile time so we have to allocate it.
+				 */
+	struct list_head search_contexts;
+	void (*put_super_fn) (struct super_block *sb);
+
+	struct task_struct *readdir_process;
+	unsigned mount_id;
+};
+
+#define yaffs_dev_to_lc(dev) ((struct yaffs_linux_context *)((dev)->os_context))
+#define yaffs_dev_to_mtd(dev) ((struct mtd_info *)((dev)->driver_context))
+
+#endif
diff --git a/fs/yaffs2/yaffs_vfs.c b/fs/yaffs2/yaffs_vfs.c
new file mode 100644
index 0000000..724bd3f
--- /dev/null
+++ b/fs/yaffs2/yaffs_vfs.c
@@ -0,0 +1,2745 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@xxxxxxxxxxxx>
+ * Acknowledgements:
+ * Luc van OostenRyck for numerous patches.
+ * Nick Bane for numerous patches.
+ * Nick Bane for 2.5/2.6 integration.
+ * Andras Toth for mknod rdev issue.
+ * Michael Fischer for finding the problem with inode inconsistency.
+ * Some code bodily lifted from JFFS
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ *
+ * This is the file system front-end to YAFFS that hooks it up to
+ * the VFS.
+ *
+ * Special notes:
+ * >> 2.4: sb->u.generic_sbp points to the struct yaffs_dev associated with
+ *         this superblock
+ * >> 2.6: sb->s_fs_info  points to the struct yaffs_dev associated with this
+ *         superblock
+ * >> inode->u.generic_ip points to the associated struct yaffs_obj.
+ */
+
+/*
+ * NB There are two variants of Linux VFS glue code. This variant supports
+ * a single version and should not include any multi-version code.
+ */
+#include <linux/version.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/proc_fs.h>
+#include <linux/smp_lock.h>
+#include <linux/pagemap.h>
+#include <linux/mtd/mtd.h>
+#include <linux/interrupt.h>
+#include <linux/string.h>
+#include <linux/ctype.h>
+#include <linux/namei.h>
+#include <linux/exportfs.h>
+#include <linux/kthread.h>
+#include <linux/delay.h>
+#include <linux/freezer.h>
+#include <asm/div64.h>
+#include <linux/statfs.h>
+#include <linux/uaccess.h>
+#include <linux/mtd/mtd.h>
+
+#include "yportenv.h"
+#include "yaffs_trace.h"
+#include "yaffs_guts.h"
+#include "yaffs_attribs.h"
+#include "yaffs_linux.h"
+#include "yaffs_mtdif.h"
+#include "yaffs_mtdif1.h"
+#include "yaffs_mtdif2.h"
+
+unsigned int yaffs_trace_mask = 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 */
+module_param(yaffs_trace_mask, uint, 0644);
+module_param(yaffs_wr_attempts, uint, 0644);
+module_param(yaffs_auto_checkpoint, uint, 0644);
+module_param(yaffs_gc_control, uint, 0644);
+module_param(yaffs_bg_enable, uint, 0644);
+
+#define yaffs_devname(sb, buf)	bdevname(sb->s_bdev, buf)
+
+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;
+}
+
+#define yaffs_inode_to_obj_lv(iptr) ((iptr)->i_private)
+#define yaffs_inode_to_obj(iptr)\
+	((struct yaffs_obj *)(yaffs_inode_to_obj_lv(iptr)))
+#define yaffs_dentry_to_obj(dptr) yaffs_inode_to_obj((dptr)->d_inode)
+#define yaffs_super_to_dev(sb)	((struct yaffs_dev *)sb->s_fs_info)
+
+#define update_dir_time(dir) do {\
+			(dir)->i_ctime = (dir)->i_mtime = CURRENT_TIME; \
+		} while (0)
+
+
+static unsigned yaffs_gc_control_callback(struct yaffs_dev *dev)
+{
+	return yaffs_gc_control;
+}
+
+static void yaffs_gross_lock(struct yaffs_dev *dev)
+{
+	yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locking %p", current);
+	mutex_lock(&(yaffs_dev_to_lc(dev)->gross_lock));
+	yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locked %p", current);
+}
+
+static void yaffs_gross_unlock(struct yaffs_dev *dev)
+{
+	yaffs_trace(YAFFS_TRACE_LOCK, "yaffs unlocking %p", current);
+	mutex_unlock(&(yaffs_dev_to_lc(dev)->gross_lock));
+}
+
+static void yaffs_fill_inode_from_obj(struct inode *inode,
+				      struct yaffs_obj *obj);
+
+static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
+{
+	struct inode *inode;
+	struct yaffs_obj *obj;
+	struct yaffs_dev *dev = yaffs_super_to_dev(sb);
+
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_iget for %lu", ino);
+
+	inode = iget_locked(sb, ino);
+	if (!inode)
+		return ERR_PTR(-ENOMEM);
+	if (!(inode->i_state & I_NEW))
+		return inode;
+
+	/* NB This is called as a side effect of other functions, but
+	 * we had to release the lock to prevent deadlocks, so
+	 * need to lock again.
+	 */
+
+	yaffs_gross_lock(dev);
+
+	obj = yaffs_find_by_number(dev, inode->i_ino);
+	yaffs_fill_inode_from_obj(inode, obj);
+
+	yaffs_gross_unlock(dev);
+
+	unlock_new_inode(inode);
+	return inode;
+}
+
+struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
+			      struct yaffs_obj *obj)
+{
+	struct inode *inode;
+
+	if (!sb) {
+		yaffs_trace(YAFFS_TRACE_OS,
+			"yaffs_get_inode for NULL super_block!!");
+		return NULL;
+
+	}
+
+	if (!obj) {
+		yaffs_trace(YAFFS_TRACE_OS,
+			"yaffs_get_inode for NULL object!!");
+		return NULL;
+
+	}
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_get_inode for object %d",
+		obj->obj_id);
+
+	inode = yaffs_iget(sb, obj->obj_id);
+	if (IS_ERR(inode))
+		return NULL;
+
+	/* NB Side effect: iget calls back to yaffs_read_inode(). */
+	/* iget also increments the inode's i_count */
+	/* NB You can't be holding gross_lock or deadlock will happen! */
+
+	return inode;
+}
+
+static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
+		       dev_t rdev)
+{
+	struct inode *inode;
+	struct yaffs_obj *obj = NULL;
+	struct yaffs_dev *dev;
+	struct yaffs_obj *parent = yaffs_inode_to_obj(dir);
+	int error;
+	uid_t uid = current->cred->fsuid;
+	gid_t gid =
+	    (dir->i_mode & S_ISGID) ? dir->i_gid : current->cred->fsgid;
+
+	if ((dir->i_mode & S_ISGID) && S_ISDIR(mode))
+		mode |= S_ISGID;
+
+	if (!parent) {
+		yaffs_trace(YAFFS_TRACE_OS,
+			"yaffs_mknod: could not get parent object");
+		return -EPERM;
+	}
+
+	yaffs_trace(YAFFS_TRACE_OS,
+			"yaffs_mknod: parent object %d type %d",
+			parent->obj_id, parent->variant_type);
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_mknod: making oject for %s, mode %x dev %x",
+		dentry->d_name.name, mode, rdev);
+
+	dev = parent->my_dev;
+
+	yaffs_gross_lock(dev);
+
+	if (yaffs_get_n_free_chunks(dev) < 1) {
+		error = -ENOSPC;
+		goto err_out;
+	}
+
+	switch (mode & S_IFMT) {
+	default:
+		/* Special (socket, fifo, device...) */
+		yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making special");
+		obj =
+		    yaffs_create_special(parent, dentry->d_name.name, mode, uid,
+					 gid, old_encode_dev(rdev));
+		break;
+	case S_IFREG:		/* file          */
+		yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making file");
+		obj = yaffs_create_file(parent, dentry->d_name.name, mode, uid,
+					gid);
+		break;
+	case S_IFDIR:		/* directory */
+		yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making directory");
+		obj = yaffs_create_dir(parent, dentry->d_name.name, mode,
+				       uid, gid);
+		break;
+	case S_IFLNK:		/* symlink */
+		yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making symlink");
+		obj = NULL;	/* Do we ever get here? */
+		break;
+	}
+
+	if (!obj) {
+		error = -ENOMEM;
+		goto err_out;
+	}
+
+	/* Can not call yaffs_get_inode() with gross lock held */
+	yaffs_gross_unlock(dev);
+
+
+	inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
+	d_instantiate(dentry, inode);
+	update_dir_time(dir);
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_mknod created object %d count = %d",
+		obj->obj_id, atomic_read(&inode->i_count));
+	yaffs_fill_inode_from_obj(dir, parent);
+	return 0;
+
+err_out:
+	yaffs_gross_unlock(dev);
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod error %d", error);
+	return error;
+
+}
+
+static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+{
+	return yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
+}
+
+static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
+			struct nameidata *n)
+{
+	return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
+}
+
+static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
+		      struct dentry *dentry)
+{
+	struct inode *inode = old_dentry->d_inode;
+	struct yaffs_obj *obj = NULL;
+	struct yaffs_obj *link = NULL;
+	struct yaffs_dev *dev;
+
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_link");
+
+	obj = yaffs_inode_to_obj(inode);
+	dev = obj->my_dev;
+
+	yaffs_gross_lock(dev);
+
+	if (!S_ISDIR(inode->i_mode))	/* Don't link directories */
+		link =
+		    yaffs_link_obj(yaffs_inode_to_obj(dir), dentry->d_name.name,
+				   obj);
+
+	if (link) {
+		old_dentry->d_inode->i_nlink = yaffs_get_obj_link_count(obj);
+		d_instantiate(dentry, old_dentry->d_inode);
+		atomic_inc(&old_dentry->d_inode->i_count);
+		yaffs_trace(YAFFS_TRACE_OS,
+			"yaffs_link link count %d i_count %d",
+			old_dentry->d_inode->i_nlink,
+			atomic_read(&old_dentry->d_inode->i_count));
+	}
+
+	yaffs_gross_unlock(dev);
+
+	if (link) {
+		update_dir_time(dir);
+		return 0;
+	}
+
+	return -EPERM;
+}
+
+static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
+			 const char *symname)
+{
+	struct yaffs_obj *obj;
+	struct yaffs_dev *dev;
+	struct inode *inode;
+	uid_t uid = current->cred->fsuid;
+	gid_t gid =
+	    (dir->i_mode & S_ISGID) ? dir->i_gid : current->cred->fsgid;
+
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_symlink");
+
+	dev = yaffs_inode_to_obj(dir)->my_dev;
+	yaffs_gross_lock(dev);
+	obj = yaffs_create_symlink(yaffs_inode_to_obj(dir), dentry->d_name.name,
+				   S_IFLNK | S_IRWXUGO, uid, gid, symname);
+	yaffs_gross_unlock(dev);
+
+	if (!obj) {
+		yaffs_trace(YAFFS_TRACE_OS, "symlink not created");
+		return -ENOMEM;
+	}
+
+	inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
+	d_instantiate(dentry, inode);
+	update_dir_time(dir);
+	yaffs_trace(YAFFS_TRACE_OS, "symlink created OK");
+
+	return 0;
+}
+
+static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
+				   struct nameidata *n)
+{
+	struct yaffs_obj *obj;
+	struct inode *inode = NULL;
+	struct yaffs_dev *dev = yaffs_inode_to_obj(dir)->my_dev;
+
+	if (current != yaffs_dev_to_lc(dev)->readdir_process)
+		yaffs_gross_lock(dev);
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_lookup for %d:%s",
+		yaffs_inode_to_obj(dir)->obj_id, dentry->d_name.name);
+
+	obj = yaffs_find_by_name(yaffs_inode_to_obj(dir), dentry->d_name.name);
+
+	obj = yaffs_get_equivalent_obj(obj);	/* in case it was a hardlink */
+
+	/* Can't hold gross lock when calling yaffs_get_inode() */
+	if (current != yaffs_dev_to_lc(dev)->readdir_process)
+		yaffs_gross_unlock(dev);
+
+	if (obj) {
+		yaffs_trace(YAFFS_TRACE_OS,
+			"yaffs_lookup found %d", obj->obj_id);
+
+		inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
+
+		if (inode) {
+			yaffs_trace(YAFFS_TRACE_OS, "yaffs_loookup dentry");
+			d_add(dentry, inode);
+			/* return dentry; */
+			return NULL;
+		}
+
+	} else {
+		yaffs_trace(YAFFS_TRACE_OS, "yaffs_lookup not found");
+
+	}
+
+	d_add(dentry, inode);
+
+	return NULL;
+}
+
+static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
+{
+	int ret_val;
+	struct yaffs_dev *dev;
+	struct yaffs_obj *obj;
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_unlink %d:%s",
+		(int)(dir->i_ino), dentry->d_name.name);
+	obj = yaffs_inode_to_obj(dir);
+	dev = obj->my_dev;
+
+	yaffs_gross_lock(dev);
+
+	ret_val = yaffs_unlinker(obj, dentry->d_name.name);
+
+	if (ret_val == YAFFS_OK) {
+		dentry->d_inode->i_nlink--;
+		dir->i_version++;
+		yaffs_gross_unlock(dev);
+		mark_inode_dirty(dentry->d_inode);
+		update_dir_time(dir);
+		return 0;
+	}
+	yaffs_gross_unlock(dev);
+	return -ENOTEMPTY;
+}
+
+static int yaffs_sync_object(struct file *file, int datasync)
+{
+
+	struct yaffs_obj *obj;
+	struct yaffs_dev *dev;
+	struct dentry *dentry = file->f_path.dentry;
+
+	obj = yaffs_dentry_to_obj(dentry);
+
+	dev = obj->my_dev;
+
+	yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, "yaffs_sync_object");
+	yaffs_gross_lock(dev);
+	yaffs_flush_file(obj, 1, datasync);
+	yaffs_gross_unlock(dev);
+	return 0;
+}
+/*
+ * The VFS layer already does all the dentry stuff for rename.
+ *
+ * NB: POSIX says you can rename an object over an old object of the same name
+ */
+static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
+			struct inode *new_dir, struct dentry *new_dentry)
+{
+	struct yaffs_dev *dev;
+	int ret_val = YAFFS_FAIL;
+	struct yaffs_obj *target;
+
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_rename");
+	dev = yaffs_inode_to_obj(old_dir)->my_dev;
+
+	yaffs_gross_lock(dev);
+
+	/* Check if the target is an existing directory that is not empty. */
+	target = yaffs_find_by_name(yaffs_inode_to_obj(new_dir),
+				    new_dentry->d_name.name);
+
+	if (target && target->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY &&
+	    !list_empty(&target->variant.dir_variant.children)) {
+
+		yaffs_trace(YAFFS_TRACE_OS, "target is non-empty dir");
+
+		ret_val = YAFFS_FAIL;
+	} else {
+		/* Now does unlinking internally using shadowing mechanism */
+		yaffs_trace(YAFFS_TRACE_OS, "calling yaffs_rename_obj");
+
+		ret_val = yaffs_rename_obj(yaffs_inode_to_obj(old_dir),
+					   old_dentry->d_name.name,
+					   yaffs_inode_to_obj(new_dir),
+					   new_dentry->d_name.name);
+	}
+	yaffs_gross_unlock(dev);
+
+	if (ret_val == YAFFS_OK) {
+		if (target) {
+			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;
+	struct yaffs_dev *dev;
+	int result;
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_setattr of object %d",
+		yaffs_inode_to_obj(inode)->obj_id);
+
+	/* Fail if a requested resize >= 2GB */
+	if (attr->ia_valid & ATTR_SIZE && (attr->ia_size >> 31))
+		error = -EINVAL;
+
+	if (!error)
+		error = inode_change_ok(inode, attr);
+
+	if (!error) {
+		setattr_copy(inode, attr);
+		yaffs_trace(YAFFS_TRACE_OS, "inode_setattr called");
+		if (attr->ia_valid & ATTR_SIZE) {
+			truncate_setsize(inode, attr->ia_size);
+			inode->i_blocks = (inode->i_size + 511) >> 9;
+		}
+		dev = yaffs_inode_to_obj(inode)->my_dev;
+		if (attr->ia_valid & ATTR_SIZE) {
+			yaffs_trace(YAFFS_TRACE_OS, "resize to %d(%x)",
+					   (int)(attr->ia_size),
+					   (int)(attr->ia_size));
+		}
+
+		yaffs_gross_lock(dev);
+		result = yaffs_set_attribs(yaffs_inode_to_obj(inode), attr);
+		if (result != YAFFS_OK)
+			error = -EPERM;
+		yaffs_gross_unlock(dev);
+	}
+
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_setattr done returning %d", error);
+
+	return error;
+}
+
+#ifdef CONFIG_YAFFS_XATTR
+static int yaffs_setxattr(struct dentry *dentry, const char *name,
+		   const void *value, size_t size, int flags)
+{
+	struct inode *inode = dentry->d_inode;
+	int error;
+	struct yaffs_dev *dev;
+	struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
+
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr of object %d", obj->obj_id);
+
+	dev = obj->my_dev;
+	yaffs_gross_lock(dev);
+	error = yaffs_set_xattrib(obj, name, value, size, flags);
+	yaffs_gross_unlock(dev);
+
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr done returning %d", error);
+
+	return error;
+}
+
+static ssize_t yaffs_getxattr(struct dentry *dentry, const char *name,
+				void *buff, size_t size)
+{
+	struct inode *inode = dentry->d_inode;
+	int error;
+	struct yaffs_dev *dev;
+	struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_getxattr \"%s\" from object %d",
+		name, obj->obj_id);
+
+	dev = obj->my_dev;
+	yaffs_gross_lock(dev);
+	error = yaffs_get_xattrib(obj, name, buff, size);
+	yaffs_gross_unlock(dev);
+
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_getxattr done returning %d", error);
+
+	return error;
+}
+
+static int yaffs_removexattr(struct dentry *dentry, const char *name)
+{
+	struct inode *inode = dentry->d_inode;
+	int error;
+	struct yaffs_dev *dev;
+	struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_removexattr of object %d", obj->obj_id);
+
+	dev = obj->my_dev;
+	yaffs_gross_lock(dev);
+	error = yaffs_remove_xattrib(obj, name);
+	yaffs_gross_unlock(dev);
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_removexattr done returning %d", error);
+
+	return error;
+}
+
+static ssize_t yaffs_listxattr(struct dentry *dentry, char *buff, size_t size)
+{
+	struct inode *inode = dentry->d_inode;
+	int error;
+	struct yaffs_dev *dev;
+	struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_listxattr of object %d", obj->obj_id);
+
+	dev = obj->my_dev;
+	yaffs_gross_lock(dev);
+	error = yaffs_list_xattrib(obj, buff, size);
+	yaffs_gross_unlock(dev);
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_listxattr done returning %d", error);
+
+	return error;
+}
+
+#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
+};
+/*-----------------------------------------------------------------*/
+/* Directory search context allows us to unlock access to yaffs during
+ * filldir without causing problems with the directory being modified.
+ * This is similar to the tried and tested mechanism used in yaffs direct.
+ *
+ * A search context iterates along a doubly linked list of siblings in the
+ * directory. If the iterating object is deleted then this would corrupt
+ * the list iteration, likely causing a crash. The search context avoids
+ * this by using the remove_obj_fn to move the search context to the
+ * next object before the object is deleted.
+ *
+ * Many readdirs (and thus seach conexts) may be alive simulateously so
+ * each struct yaffs_dev has a list of these.
+ *
+ * A seach context lives for the duration of a readdir.
+ *
+ * All these functions must be called while yaffs is locked.
+ */
+
+struct yaffs_search_context {
+	struct yaffs_dev *dev;
+	struct yaffs_obj *dir_obj;
+	struct yaffs_obj *next_return;
+	struct list_head others;
+};
+
+/*
+ * yaffs_new_search() creates a new search context, initialises it and
+ * adds it to the device's search context list.
+ *
+ * Called at start of readdir.
+ */
+static struct yaffs_search_context *yaffs_new_search(struct yaffs_obj *dir)
+{
+	struct yaffs_dev *dev = dir->my_dev;
+	struct yaffs_search_context *sc =
+	    kmalloc(sizeof(struct yaffs_search_context), GFP_NOFS);
+
+	if (!sc)
+		return NULL;
+
+	sc->dir_obj = dir;
+	sc->dev = dev;
+	if (list_empty(&sc->dir_obj->variant.dir_variant.children))
+		sc->next_return = NULL;
+	else
+		sc->next_return =
+		    list_entry(dir->variant.dir_variant.children.next,
+			       struct yaffs_obj, siblings);
+	INIT_LIST_HEAD(&sc->others);
+	list_add(&sc->others, &(yaffs_dev_to_lc(dev)->search_contexts));
+
+	return sc;
+}
+
+/*
+ * yaffs_search_end() disposes of a search context and cleans up.
+ */
+static void yaffs_search_end(struct yaffs_search_context *sc)
+{
+	if (sc) {
+		list_del(&sc->others);
+		kfree(sc);
+	}
+}
+
+/*
+ * yaffs_search_advance() moves a search context to the next object.
+ * Called when the search iterates or when an object removal causes
+ * the search context to be moved to the next object.
+ */
+static void yaffs_search_advance(struct yaffs_search_context *sc)
+{
+	if (!sc)
+		return;
+
+	if (sc->next_return == NULL ||
+	    list_empty(&sc->dir_obj->variant.dir_variant.children))
+		sc->next_return = NULL;
+	else {
+		struct list_head *next = sc->next_return->siblings.next;
+
+		if (next == &sc->dir_obj->variant.dir_variant.children)
+			sc->next_return = NULL;	/* end of list */
+		else
+			sc->next_return =
+			    list_entry(next, struct yaffs_obj, siblings);
+	}
+}
+
+/*
+ * yaffs_remove_obj_callback() is called when an object is unlinked.
+ * We check open search contexts and advance any which are currently
+ * on the object being iterated.
+ */
+static void yaffs_remove_obj_callback(struct yaffs_obj *obj)
+{
+
+	struct list_head *i;
+	struct yaffs_search_context *sc;
+	struct list_head *search_contexts =
+	    &(yaffs_dev_to_lc(obj->my_dev)->search_contexts);
+
+	/* Iterate through the directory search contexts.
+	 * If any are currently on the object being removed, then advance
+	 * the search context to the next object to prevent a hanging pointer.
+	 */
+	list_for_each(i, search_contexts) {
+		sc = list_entry(i, struct yaffs_search_context, others);
+		if (sc->next_return == obj)
+			yaffs_search_advance(sc);
+	}
+
+}
+
+static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
+{
+	struct yaffs_obj *obj;
+	struct yaffs_dev *dev;
+	struct yaffs_search_context *sc;
+	struct inode *inode = f->f_dentry->d_inode;
+	unsigned long offset, curoffs;
+	struct yaffs_obj *l;
+	int ret_val = 0;
+	char name[YAFFS_MAX_NAME_LENGTH + 1];
+
+	obj = yaffs_dentry_to_obj(f->f_dentry);
+	dev = obj->my_dev;
+
+	yaffs_gross_lock(dev);
+
+	yaffs_dev_to_lc(dev)->readdir_process = current;
+
+	offset = f->f_pos;
+
+	sc = yaffs_new_search(obj);
+	if (!sc) {
+		ret_val = -ENOMEM;
+		goto out;
+	}
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_readdir: starting at %d", (int)offset);
+
+	if (offset == 0) {
+		yaffs_trace(YAFFS_TRACE_OS,
+			"yaffs_readdir: entry . ino %d",
+			(int)inode->i_ino);
+		yaffs_gross_unlock(dev);
+		if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0) {
+			yaffs_gross_lock(dev);
+			goto out;
+		}
+		yaffs_gross_lock(dev);
+		offset++;
+		f->f_pos++;
+	}
+	if (offset == 1) {
+		yaffs_trace(YAFFS_TRACE_OS,
+			"yaffs_readdir: entry .. ino %d",
+			(int)f->f_dentry->d_parent->d_inode->i_ino);
+		yaffs_gross_unlock(dev);
+		if (filldir(dirent, "..", 2, offset,
+			    f->f_dentry->d_parent->d_inode->i_ino,
+			    DT_DIR) < 0) {
+			yaffs_gross_lock(dev);
+			goto out;
+		}
+		yaffs_gross_lock(dev);
+		offset++;
+		f->f_pos++;
+	}
+
+	curoffs = 1;
+
+	/* If the directory has changed since the open or last call to
+	   readdir, rewind to after the 2 canned entries. */
+	if (f->f_version != inode->i_version) {
+		offset = 2;
+		f->f_pos = offset;
+		f->f_version = inode->i_version;
+	}
+
+	while (sc->next_return) {
+		curoffs++;
+		l = sc->next_return;
+		if (curoffs >= offset) {
+			int this_inode = yaffs_get_obj_inode(l);
+			int this_type = yaffs_get_obj_type(l);
+
+			yaffs_get_obj_name(l, name, YAFFS_MAX_NAME_LENGTH + 1);
+			yaffs_trace(YAFFS_TRACE_OS,
+				"yaffs_readdir: %s inode %d",
+				name, yaffs_get_obj_inode(l));
+
+			yaffs_gross_unlock(dev);
+
+			if (filldir(dirent,
+				    name,
+				    strlen(name),
+				    offset, this_inode, this_type) < 0) {
+				yaffs_gross_lock(dev);
+				goto out;
+			}
+
+			yaffs_gross_lock(dev);
+
+			offset++;
+			f->f_pos++;
+		}
+		yaffs_search_advance(sc);
+	}
+
+out:
+	yaffs_search_end(sc);
+	yaffs_dev_to_lc(dev)->readdir_process = NULL;
+	yaffs_gross_unlock(dev);
+
+	return ret_val;
+}
+
+static const struct file_operations yaffs_dir_operations = {
+	.read = generic_read_dir,
+	.readdir = yaffs_readdir,
+	.fsync = yaffs_sync_object,
+	.llseek = generic_file_llseek,
+};
+
+
+
+static int yaffs_file_flush(struct file *file, fl_owner_t id)
+{
+	struct yaffs_obj *obj = yaffs_dentry_to_obj(file->f_dentry);
+	struct yaffs_dev *dev = obj->my_dev;
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_file_flush object %d (%s)",
+		obj->obj_id, obj->dirty ? "dirty" : "clean");
+
+	yaffs_gross_lock(dev);
+
+	yaffs_flush_file(obj, 1, 0);
+
+	yaffs_gross_unlock(dev);
+
+	return 0;
+}
+
+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,
+};
+
+
+/* ExportFS support */
+static struct inode *yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino,
+					  uint32_t generation)
+{
+	return yaffs_iget(sb, ino);
+}
+
+static struct dentry *yaffs2_fh_to_dentry(struct super_block *sb,
+					  struct fid *fid, int fh_len,
+					  int fh_type)
+{
+	return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
+				    yaffs2_nfs_get_inode);
+}
+
+static struct dentry *yaffs2_fh_to_parent(struct super_block *sb,
+					  struct fid *fid, int fh_len,
+					  int fh_type)
+{
+	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
+				    yaffs2_nfs_get_inode);
+}
+
+struct dentry *yaffs2_get_parent(struct dentry *dentry)
+{
+
+	struct super_block *sb = dentry->d_inode->i_sb;
+	struct dentry *parent = ERR_PTR(-ENOENT);
+	struct inode *inode;
+	unsigned long parent_ino;
+	struct yaffs_obj *d_obj;
+	struct yaffs_obj *parent_obj;
+
+	d_obj = yaffs_inode_to_obj(dentry->d_inode);
+
+	if (d_obj) {
+		parent_obj = d_obj->parent;
+		if (parent_obj) {
+			parent_ino = yaffs_get_obj_inode(parent_obj);
+			inode = yaffs_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,
+};
+
+
+/*-----------------------------------------------------------------*/
+
+static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
+			  int buflen)
+{
+	unsigned char *alias;
+	int ret;
+	struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
+
+	yaffs_gross_lock(dev);
+
+	alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
+
+	yaffs_gross_unlock(dev);
+
+	if (!alias)
+		return -ENOMEM;
+
+	ret = vfs_readlink(dentry, buffer, buflen, alias);
+	kfree(alias);
+	return ret;
+}
+
+static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+	unsigned char *alias;
+	void *ret;
+	struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
+
+	yaffs_gross_lock(dev);
+
+	alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
+	yaffs_gross_unlock(dev);
+
+	if (!alias) {
+		ret = ERR_PTR(-ENOMEM);
+		goto out;
+	}
+
+	nd_set_link(nd, alias);
+	ret = (void *)alias;
+out:
+	return ret;
+}
+
+void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias)
+{
+	kfree(alias);
+}
+
+
+static void yaffs_unstitch_obj(struct inode *inode, struct yaffs_obj *obj)
+{
+	/* Clear the association between the inode and
+	 * the struct yaffs_obj.
+	 */
+	obj->my_inode = NULL;
+	yaffs_inode_to_obj_lv(inode) = NULL;
+
+	/* If the object freeing was deferred, then the real
+	 * free happens now.
+	 * This should fix the inode inconsistency problem.
+	 */
+	yaffs_handle_defered_free(obj);
+}
+
+/* yaffs_evict_inode combines into one operation what was previously done in
+ * yaffs_clear_inode() and yaffs_delete_inode()
+ *
+ */
+static void yaffs_evict_inode(struct inode *inode)
+{
+	struct yaffs_obj *obj;
+	struct yaffs_dev *dev;
+	int deleteme = 0;
+
+	obj = yaffs_inode_to_obj(inode);
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_evict_inode: ino %d, count %d %s",
+		(int)inode->i_ino,
+		atomic_read(&inode->i_count),
+		obj ? "object exists" : "null object");
+
+	if (!inode->i_nlink && !is_bad_inode(inode))
+		deleteme = 1;
+	truncate_inode_pages(&inode->i_data, 0);
+	end_writeback(inode);
+
+	if (deleteme && obj) {
+		dev = obj->my_dev;
+		yaffs_gross_lock(dev);
+		yaffs_del_obj(obj);
+		yaffs_gross_unlock(dev);
+	}
+	if (obj) {
+		dev = obj->my_dev;
+		yaffs_gross_lock(dev);
+		yaffs_unstitch_obj(inode, obj);
+		yaffs_gross_unlock(dev);
+	}
+
+}
+
+static void yaffs_touch_super(struct yaffs_dev *dev)
+{
+	struct super_block *sb = yaffs_dev_to_lc(dev)->super;
+
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_touch_super() sb = %p", sb);
+	if (sb)
+		sb->s_dirt = 1;
+}
+
+static int yaffs_readpage_nolock(struct file *f, struct page *pg)
+{
+	/* Lifted from jffs2 */
+
+	struct yaffs_obj *obj;
+	unsigned char *pg_buf;
+	int ret;
+	struct yaffs_dev *dev;
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_readpage_nolock at %08x, size %08x",
+		(unsigned)(pg->index << PAGE_CACHE_SHIFT),
+		(unsigned)PAGE_CACHE_SIZE);
+
+	obj = yaffs_dentry_to_obj(f->f_dentry);
+
+	dev = obj->my_dev;
+
+	BUG_ON(!PageLocked(pg));
+
+	pg_buf = kmap(pg);
+	/* FIXME: Can kmap fail? */
+
+	yaffs_gross_lock(dev);
+
+	ret = yaffs_file_rd(obj, pg_buf,
+			    pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE);
+
+	yaffs_gross_unlock(dev);
+
+	if (ret >= 0)
+		ret = 0;
+
+	if (ret) {
+		ClearPageUptodate(pg);
+		SetPageError(pg);
+	} else {
+		SetPageUptodate(pg);
+		ClearPageError(pg);
+	}
+
+	flush_dcache_page(pg);
+	kunmap(pg);
+
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage_nolock done");
+	return ret;
+}
+
+static int yaffs_readpage_unlock(struct file *f, struct page *pg)
+{
+	int ret = yaffs_readpage_nolock(f, pg);
+
+	unlock_page(pg);
+	return ret;
+}
+
+static int yaffs_readpage(struct file *f, struct page *pg)
+{
+	int ret;
+
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage");
+	ret = yaffs_readpage_unlock(f, pg);
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage done");
+	return ret;
+}
+
+/* writepage inspired by/stolen from smbfs */
+
+static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
+{
+	struct yaffs_dev *dev;
+	struct address_space *mapping = page->mapping;
+	struct inode *inode;
+	unsigned long end_index;
+	char *buffer;
+	struct yaffs_obj *obj;
+	int n_written = 0;
+	unsigned n_bytes;
+	loff_t i_size;
+
+	if (!mapping)
+		BUG();
+	inode = mapping->host;
+	if (!inode)
+		BUG();
+	i_size = i_size_read(inode);
+
+	end_index = i_size >> PAGE_CACHE_SHIFT;
+
+	if (page->index < end_index)
+		n_bytes = PAGE_CACHE_SIZE;
+	else {
+		n_bytes = i_size & (PAGE_CACHE_SIZE - 1);
+
+		if (page->index > end_index || !n_bytes) {
+			yaffs_trace(YAFFS_TRACE_OS,
+				"yaffs_writepage at %08x, inode size = %08x!!!",
+				(unsigned)(page->index << PAGE_CACHE_SHIFT),
+				(unsigned)inode->i_size);
+			yaffs_trace(YAFFS_TRACE_OS,
+			  "                -> don't care!!");
+
+			zero_user_segment(page, 0, PAGE_CACHE_SIZE);
+			set_page_writeback(page);
+			unlock_page(page);
+			end_page_writeback(page);
+			return 0;
+		}
+	}
+
+	if (n_bytes != PAGE_CACHE_SIZE)
+		zero_user_segment(page, n_bytes, PAGE_CACHE_SIZE);
+
+	get_page(page);
+
+	buffer = kmap(page);
+
+	obj = yaffs_inode_to_obj(inode);
+	dev = obj->my_dev;
+	yaffs_gross_lock(dev);
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_writepage at %08x, size %08x",
+		(unsigned)(page->index << PAGE_CACHE_SHIFT), n_bytes);
+	yaffs_trace(YAFFS_TRACE_OS,
+		"writepag0: obj = %05x, ino = %05x",
+		(int)obj->variant.file_variant.file_size, (int)inode->i_size);
+
+	n_written = yaffs_wr_file(obj, buffer,
+				  page->index << PAGE_CACHE_SHIFT, n_bytes, 0);
+
+	yaffs_touch_super(dev);
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"writepag1: obj = %05x, ino = %05x",
+		(int)obj->variant.file_variant.file_size, (int)inode->i_size);
+
+	yaffs_gross_unlock(dev);
+
+	kunmap(page);
+	set_page_writeback(page);
+	unlock_page(page);
+	end_page_writeback(page);
+	put_page(page);
+
+	return (n_written == n_bytes) ? 0 : -ENOSPC;
+}
+
+/* Space holding and freeing is done to ensure we have space available for
+ * write_begin/end.
+ * For now we just assume few parallel writes and check against a small
+ * number.
+ * Todo: need to do this with a counter to handle parallel reads better
+ */
+
+static ssize_t yaffs_hold_space(struct file *f)
+{
+	struct yaffs_obj *obj;
+	struct yaffs_dev *dev;
+	int n_free_chunks;
+
+	obj = yaffs_dentry_to_obj(f->f_dentry);
+
+	dev = obj->my_dev;
+
+	yaffs_gross_lock(dev);
+
+	n_free_chunks = yaffs_get_n_free_chunks(dev);
+
+	yaffs_gross_unlock(dev);
+
+	return (n_free_chunks > 20) ? 1 : 0;
+}
+
+static void yaffs_release_space(struct file *f)
+{
+	struct yaffs_obj *obj;
+	struct yaffs_dev *dev;
+
+	obj = yaffs_dentry_to_obj(f->f_dentry);
+
+	dev = obj->my_dev;
+
+	yaffs_gross_lock(dev);
+
+	yaffs_gross_unlock(dev);
+}
+
+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 */
+	pg = grab_cache_page_write_begin(mapping, index, flags);
+
+	*pagep = pg;
+	if (!pg) {
+		ret = -ENOMEM;
+		goto out;
+	}
+	yaffs_trace(YAFFS_TRACE_OS,
+		"start yaffs_write_begin index %d(%x) uptodate %d",
+		(int)index, (int)index, PageUptodate(pg) ? 1 : 0);
+
+	/* Get fs space */
+	space_held = yaffs_hold_space(filp);
+
+	if (!space_held) {
+		ret = -ENOSPC;
+		goto out;
+	}
+
+	/* Update page if required */
+
+	if (!PageUptodate(pg))
+		ret = yaffs_readpage_nolock(filp, pg);
+
+	if (ret)
+		goto out;
+
+	/* Happy path return */
+	yaffs_trace(YAFFS_TRACE_OS, "end yaffs_write_begin - ok");
+
+	return 0;
+
+out:
+	yaffs_trace(YAFFS_TRACE_OS,
+		"end yaffs_write_begin fail returning %d", ret);
+	if (space_held)
+		yaffs_release_space(filp);
+	if (pg) {
+		unlock_page(pg);
+		page_cache_release(pg);
+	}
+	return ret;
+}
+
+static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
+				loff_t *pos)
+{
+	struct yaffs_obj *obj;
+	int n_written, ipos;
+	struct inode *inode;
+	struct yaffs_dev *dev;
+
+	obj = yaffs_dentry_to_obj(f->f_dentry);
+
+	if (!obj) {
+		/* This should not happen */
+		yaffs_trace(YAFFS_TRACE_OS,
+			"yaffs_file_write: hey obj is null!");
+		return -EINVAL;
+	}
+
+	dev = obj->my_dev;
+
+	yaffs_gross_lock(dev);
+
+	inode = f->f_dentry->d_inode;
+
+	if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
+		ipos = inode->i_size;
+	else
+		ipos = *pos;
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_file_write about to write writing %u(%x) bytes to object %d at %d(%x)",
+		(unsigned)n, (unsigned)n, obj->obj_id, ipos, ipos);
+
+	n_written = yaffs_wr_file(obj, buf, ipos, n, 0);
+
+	yaffs_touch_super(dev);
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_file_write: %d(%x) bytes written",
+		(unsigned)n, (unsigned)n);
+
+	if (n_written > 0) {
+		ipos += n_written;
+		*pos = ipos;
+		if (ipos > inode->i_size) {
+			inode->i_size = ipos;
+			inode->i_blocks = (ipos + 511) >> 9;
+
+			yaffs_trace(YAFFS_TRACE_OS,
+				"yaffs_file_write size updated to %d bytes, %d blocks",
+				ipos, (int)(inode->i_blocks));
+		}
+	}
+	yaffs_gross_unlock(dev);
+	return (n_written == 0) && (n > 0) ? -ENOSPC : n_written;
+}
+
+static int yaffs_write_end(struct file *filp, struct address_space *mapping,
+			   loff_t pos, unsigned len, unsigned copied,
+			   struct page *pg, void *fsdadata)
+{
+	int ret = 0;
+	void *addr, *kva;
+	uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1);
+
+	kva = kmap(pg);
+	addr = kva + offset_into_page;
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_write_end addr %p pos %x n_bytes %d",
+		addr, (unsigned)pos, copied);
+
+	ret = yaffs_file_write(filp, addr, copied, &pos);
+
+	if (ret != copied) {
+		yaffs_trace(YAFFS_TRACE_OS,
+			"yaffs_write_end not same size ret %d  copied %d",
+			ret, copied);
+		SetPageError(pg);
+	}
+
+	kunmap(pg);
+
+	yaffs_release_space(filp);
+	unlock_page(pg);
+	page_cache_release(pg);
+	return ret;
+}
+
+static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+	struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
+	struct super_block *sb = dentry->d_sb;
+
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_statfs");
+
+	yaffs_gross_lock(dev);
+
+	buf->f_type = YAFFS_MAGIC;
+	buf->f_bsize = sb->s_blocksize;
+	buf->f_namelen = 255;
+
+	if (dev->data_bytes_per_chunk & (dev->data_bytes_per_chunk - 1)) {
+		/* Do this if chunk size is not a power of 2 */
+
+		uint64_t bytes_in_dev;
+		uint64_t bytes_free;
+
+		bytes_in_dev =
+		    ((uint64_t)
+		     ((dev->param.end_block - dev->param.start_block + 1))) *
+		     ((uint64_t) (dev->param.chunks_per_block *
+					   dev->data_bytes_per_chunk));
+
+		do_div(bytes_in_dev, sb->s_blocksize);
+			/* bytes_in_dev becomes the number of blocks */
+		buf->f_blocks = bytes_in_dev;
+
+		bytes_free = ((uint64_t) (yaffs_get_n_free_chunks(dev))) *
+		    ((uint64_t) (dev->data_bytes_per_chunk));
+
+		do_div(bytes_free, sb->s_blocksize);
+
+		buf->f_bfree = bytes_free;
+
+	} else if (sb->s_blocksize > dev->data_bytes_per_chunk) {
+
+		buf->f_blocks =
+		    (dev->param.end_block - dev->param.start_block + 1) *
+		    dev->param.chunks_per_block /
+		    (sb->s_blocksize / dev->data_bytes_per_chunk);
+		buf->f_bfree =
+		    yaffs_get_n_free_chunks(dev) /
+		    (sb->s_blocksize / dev->data_bytes_per_chunk);
+	} else {
+		buf->f_blocks =
+		    (dev->param.end_block - dev->param.start_block + 1) *
+		    dev->param.chunks_per_block *
+		    (dev->data_bytes_per_chunk / sb->s_blocksize);
+
+		buf->f_bfree =
+		    yaffs_get_n_free_chunks(dev) *
+		    (dev->data_bytes_per_chunk / sb->s_blocksize);
+	}
+
+	buf->f_files = 0;
+	buf->f_ffree = 0;
+	buf->f_bavail = buf->f_bfree;
+
+	yaffs_gross_unlock(dev);
+	return 0;
+}
+
+static void yaffs_flush_inodes(struct super_block *sb)
+{
+	struct inode *iptr;
+	struct yaffs_obj *obj;
+
+	list_for_each_entry(iptr, &sb->s_inodes, i_sb_list) {
+		obj = yaffs_inode_to_obj(iptr);
+		if (obj) {
+			yaffs_trace(YAFFS_TRACE_OS,
+				"flushing obj %d", obj->obj_id);
+			yaffs_flush_file(obj, 1, 0);
+		}
+	}
+}
+
+static void yaffs_flush_super(struct super_block *sb, int do_checkpoint)
+{
+	struct yaffs_dev *dev = yaffs_super_to_dev(sb);
+
+	if (!dev)
+		return;
+
+	yaffs_flush_inodes(sb);
+	yaffs_update_dirty_dirs(dev);
+	yaffs_flush_whole_cache(dev);
+	if (do_checkpoint)
+		yaffs_checkpoint_save(dev);
+}
+
+static unsigned yaffs_bg_gc_urgency(struct yaffs_dev *dev)
+{
+	unsigned erased_chunks =
+	    dev->n_erased_blocks * dev->param.chunks_per_block;
+	struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
+	unsigned scattered = 0;	/* Free chunks not in an erased block */
+
+	if (erased_chunks < dev->n_free_chunks)
+		scattered = (dev->n_free_chunks - erased_chunks);
+
+	if (!context->bg_running)
+		return 0;
+	else if (scattered < (dev->param.chunks_per_block * 2))
+		return 0;
+	else if (erased_chunks > dev->n_free_chunks / 2)
+		return 0;
+	else if (erased_chunks > dev->n_free_chunks / 4)
+		return 1;
+	else
+		return 2;
+}
+
+static int yaffs_do_sync_fs(struct super_block *sb, int request_checkpoint)
+{
+
+	struct yaffs_dev *dev = yaffs_super_to_dev(sb);
+	unsigned int oneshot_checkpoint = (yaffs_auto_checkpoint & 4);
+	unsigned gc_urgent = yaffs_bg_gc_urgency(dev);
+	int do_checkpoint;
+
+	yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
+		"yaffs_do_sync_fs: gc-urgency %d %s %s%s",
+		gc_urgent,
+		sb->s_dirt ? "dirty" : "clean",
+		request_checkpoint ? "checkpoint requested" : "no checkpoint",
+		oneshot_checkpoint ? " one-shot" : "");
+
+	yaffs_gross_lock(dev);
+	do_checkpoint = ((request_checkpoint && !gc_urgent) ||
+			 oneshot_checkpoint) && !dev->is_checkpointed;
+
+	if (sb->s_dirt || do_checkpoint) {
+		yaffs_flush_super(sb, !dev->is_checkpointed && do_checkpoint);
+		sb->s_dirt = 0;
+		if (oneshot_checkpoint)
+			yaffs_auto_checkpoint &= ~4;
+	}
+	yaffs_gross_unlock(dev);
+
+	return 0;
+}
+
+/*
+ * yaffs background thread functions .
+ * yaffs_bg_thread_fn() the thread function
+ * yaffs_bg_start() launches the background thread.
+ * yaffs_bg_stop() cleans up the background thread.
+ *
+ * NB:
+ * The thread should only run after the yaffs is initialised
+ * The thread should be stopped before yaffs is unmounted.
+ * The thread should not do any writing while the fs is in read only.
+ */
+
+void yaffs_background_waker(unsigned long data)
+{
+	wake_up_process((struct task_struct *)data);
+}
+
+static int yaffs_bg_thread_fn(void *data)
+{
+	struct yaffs_dev *dev = (struct yaffs_dev *)data;
+	struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
+	unsigned long now = jiffies;
+	unsigned long next_dir_update = now;
+	unsigned long next_gc = now;
+	unsigned long expires;
+	unsigned int urgency;
+	int gc_result;
+	struct timer_list timer;
+
+	yaffs_trace(YAFFS_TRACE_BACKGROUND,
+		"yaffs_background starting for dev %p", (void *)dev);
+
+	set_freezable();
+	while (context->bg_running) {
+		yaffs_trace(YAFFS_TRACE_BACKGROUND, "yaffs_background");
+
+		if (kthread_should_stop())
+			break;
+
+		if (try_to_freeze())
+			continue;
+
+		yaffs_gross_lock(dev);
+
+		now = jiffies;
+
+		if (time_after(now, next_dir_update) && yaffs_bg_enable) {
+			yaffs_update_dirty_dirs(dev);
+			next_dir_update = now + HZ;
+		}
+
+		if (time_after(now, next_gc) && yaffs_bg_enable) {
+			if (!dev->is_checkpointed) {
+				urgency = yaffs_bg_gc_urgency(dev);
+				gc_result = yaffs_bg_gc(dev, urgency);
+				if (urgency > 1)
+					next_gc = now + HZ / 20 + 1;
+				else if (urgency > 0)
+					next_gc = now + HZ / 10 + 1;
+				else
+					next_gc = now + HZ * 2;
+			} else	{
+				/*
+				 * gc not running so set to next_dir_update
+				 * to cut down on wake ups
+				 */
+				next_gc = next_dir_update;
+			}
+		}
+		yaffs_gross_unlock(dev);
+		expires = next_dir_update;
+		if (time_before(next_gc, expires))
+			expires = next_gc;
+		if (time_before(expires, now))
+			expires = now + HZ;
+
+		init_timer_on_stack(&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);
+	}
+
+	return 0;
+}
+
+static int yaffs_bg_start(struct yaffs_dev *dev)
+{
+	int retval = 0;
+	struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
+
+	if (dev->read_only)
+		return -1;
+
+	context->bg_running = 1;
+
+	context->bg_thread = kthread_run(yaffs_bg_thread_fn,
+					 (void *)dev, "yaffs-bg-%d",
+					 context->mount_id);
+
+	if (IS_ERR(context->bg_thread)) {
+		retval = PTR_ERR(context->bg_thread);
+		context->bg_thread = NULL;
+		context->bg_running = 0;
+	}
+	return retval;
+}
+
+static void yaffs_bg_stop(struct yaffs_dev *dev)
+{
+	struct yaffs_linux_context *ctxt = yaffs_dev_to_lc(dev);
+
+	ctxt->bg_running = 0;
+
+	if (ctxt->bg_thread) {
+		kthread_stop(ctxt->bg_thread);
+		ctxt->bg_thread = NULL;
+	}
+}
+
+static void yaffs_write_super(struct super_block *sb)
+{
+	unsigned request_checkpoint = (yaffs_auto_checkpoint >= 2);
+
+	yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
+		"yaffs_write_super%s",
+		request_checkpoint ? " checkpt" : "");
+
+	yaffs_do_sync_fs(sb, request_checkpoint);
+
+}
+
+static int yaffs_sync_fs(struct super_block *sb, int wait)
+{
+	unsigned request_checkpoint = (yaffs_auto_checkpoint >= 1);
+
+	yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
+		"yaffs_sync_fs%s", request_checkpoint ? " checkpt" : "");
+
+	yaffs_do_sync_fs(sb, request_checkpoint);
+
+	return 0;
+}
+
+static LIST_HEAD(yaffs_context_list);
+struct mutex yaffs_context_lock;
+
+struct yaffs_options {
+	int inband_tags;
+	int skip_checkpoint_read;
+	int skip_checkpoint_write;
+	int no_cache;
+	int tags_ecc_on;
+	int tags_ecc_overridden;
+	int lazy_loading_enabled;
+	int lazy_loading_overridden;
+	int empty_lost_and_found;
+	int empty_lost_and_found_overridden;
+};
+
+#define MAX_OPT_LEN 30
+static int yaffs_parse_options(struct yaffs_options *options,
+				const char *options_str)
+{
+	char cur_opt[MAX_OPT_LEN + 1];
+	int p;
+	int error = 0;
+
+	/* Parse through the options which is a comma seperated list */
+
+	while (options_str && *options_str && !error) {
+		memset(cur_opt, 0, MAX_OPT_LEN + 1);
+		p = 0;
+
+		while (*options_str == ',')
+			options_str++;
+
+		while (*options_str && *options_str != ',') {
+			if (p < MAX_OPT_LEN) {
+				cur_opt[p] = *options_str;
+				p++;
+			}
+			options_str++;
+		}
+
+		if (!strcmp(cur_opt, "inband-tags")) {
+			options->inband_tags = 1;
+		} else if (!strcmp(cur_opt, "tags-ecc-off")) {
+			options->tags_ecc_on = 0;
+			options->tags_ecc_overridden = 1;
+		} else if (!strcmp(cur_opt, "tags-ecc-on")) {
+			options->tags_ecc_on = 1;
+			options->tags_ecc_overridden = 1;
+		} else if (!strcmp(cur_opt, "lazy-loading-off")) {
+			options->lazy_loading_enabled = 0;
+			options->lazy_loading_overridden = 1;
+		} else if (!strcmp(cur_opt, "lazy-loading-on")) {
+			options->lazy_loading_enabled = 1;
+			options->lazy_loading_overridden = 1;
+		} else if (!strcmp(cur_opt, "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 const struct address_space_operations yaffs_file_address_operations = {
+	.readpage = yaffs_readpage,
+	.writepage = yaffs_writepage,
+	.write_begin = yaffs_write_begin,
+	.write_end = yaffs_write_end,
+};
+
+
+
+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,
+	.put_link = yaffs_put_link,
+	.setattr = yaffs_setattr,
+#ifdef CONFIG_YAFFS_XATTR
+	.setxattr = yaffs_setxattr,
+	.getxattr = yaffs_getxattr,
+	.listxattr = yaffs_listxattr,
+	.removexattr = yaffs_removexattr,
+#endif
+};
+
+static void yaffs_fill_inode_from_obj(struct inode *inode,
+				      struct yaffs_obj *obj)
+{
+	u32 mode;
+
+	if (!inode || !obj)  {
+		yaffs_trace(YAFFS_TRACE_OS,
+			"yaffs_fill_inode invalid parameters");
+		return;
+	}
+
+	/* Check mode against the variant type
+	 * and attempt to repair if broken. */
+	mode = obj->yst_mode;
+
+	switch (obj->variant_type) {
+	case YAFFS_OBJECT_TYPE_FILE:
+		if (!S_ISREG(mode)) {
+			obj->yst_mode &= ~S_IFMT;
+			obj->yst_mode |= S_IFREG;
+		}
+		break;
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+		if (!S_ISLNK(mode)) {
+			obj->yst_mode &= ~S_IFMT;
+			obj->yst_mode |= S_IFLNK;
+		}
+		break;
+	case YAFFS_OBJECT_TYPE_DIRECTORY:
+		if (!S_ISDIR(mode)) {
+			obj->yst_mode &= ~S_IFMT;
+			obj->yst_mode |= S_IFDIR;
+		}
+		break;
+	case YAFFS_OBJECT_TYPE_UNKNOWN:
+	case YAFFS_OBJECT_TYPE_HARDLINK:
+	case YAFFS_OBJECT_TYPE_SPECIAL:
+	default:
+		/* TODO? */
+		break;
+	}
+
+	inode->i_flags |= S_NOATIME;
+	inode->i_ino = obj->obj_id;
+	inode->i_mode = obj->yst_mode;
+	inode->i_uid = obj->yst_uid;
+	inode->i_gid = obj->yst_gid;
+
+	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;
+	inode->i_size = yaffs_get_obj_length(obj);
+	inode->i_blocks = (inode->i_size + 511) >> 9;
+	inode->i_nlink = yaffs_get_obj_link_count(obj);
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_fill_inode mode %x uid %d gid %d size %d count %d",
+		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 */
+		init_special_inode(inode, obj->yst_mode,
+				   old_decode_dev(obj->yst_rdev));
+		break;
+	case S_IFREG:	/* file */
+		inode->i_op = &yaffs_file_inode_operations;
+		inode->i_fop = &yaffs_file_operations;
+		inode->i_mapping->a_ops = &yaffs_file_address_operations;
+		break;
+	case S_IFDIR:	/* directory */
+		inode->i_op = &yaffs_dir_inode_operations;
+		inode->i_fop = &yaffs_dir_operations;
+		break;
+	case S_IFLNK:	/* symlink */
+		inode->i_op = &yaffs_symlink_inode_operations;
+		break;
+	}
+
+	yaffs_inode_to_obj_lv(inode) = obj;
+	obj->my_inode = inode;
+}
+
+static void yaffs_put_super(struct super_block *sb)
+{
+	struct yaffs_dev *dev = yaffs_super_to_dev(sb);
+
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_put_super");
+
+	yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
+		"Shutting down yaffs background thread");
+	yaffs_bg_stop(dev);
+	yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
+		"yaffs background thread shut down");
+
+	yaffs_gross_lock(dev);
+
+	yaffs_flush_super(sb, 1);
+
+	if (yaffs_dev_to_lc(dev)->put_super_fn)
+		yaffs_dev_to_lc(dev)->put_super_fn(sb);
+
+	yaffs_deinitialise(dev);
+
+	yaffs_gross_unlock(dev);
+	mutex_lock(&yaffs_context_lock);
+	list_del_init(&(yaffs_dev_to_lc(dev)->context_list));
+	mutex_unlock(&yaffs_context_lock);
+
+	if (yaffs_dev_to_lc(dev)->spare_buffer) {
+		kfree(yaffs_dev_to_lc(dev)->spare_buffer);
+		yaffs_dev_to_lc(dev)->spare_buffer = NULL;
+	}
+
+	kfree(dev);
+}
+
+static void yaffs_mtd_put_super(struct super_block *sb)
+{
+	struct mtd_info *mtd = yaffs_dev_to_mtd(yaffs_super_to_dev(sb));
+
+	if (mtd->sync)
+		mtd->sync(mtd);
+
+	put_mtd_device(mtd);
+}
+
+static const struct super_operations yaffs_super_ops = {
+	.statfs = yaffs_statfs,
+	.put_super = yaffs_put_super,
+	.evict_inode = yaffs_evict_inode,
+	.sync_fs = yaffs_sync_fs,
+	.write_super = yaffs_write_super,
+};
+
+static struct super_block *yaffs_internal_read_super(int yaffs_version,
+						     struct super_block *sb,
+						     void *data, int silent)
+{
+	int n_blocks;
+	struct inode *inode = NULL;
+	struct dentry *root;
+	struct yaffs_dev *dev = 0;
+	char devname_buf[BDEVNAME_SIZE + 1];
+	struct mtd_info *mtd;
+	int err;
+	char *data_str = (char *)data;
+	struct yaffs_linux_context *context = NULL;
+	struct yaffs_param *param;
+	int read_only = 0;
+	struct yaffs_options options;
+	unsigned mount_id;
+	int found;
+	struct yaffs_linux_context *context_iterator;
+	struct list_head *l;
+
+	if (!sb) {
+		printk(KERN_INFO "yaffs: sb is NULL\n");
+		return NULL;
+	}
+
+	sb->s_magic = YAFFS_MAGIC;
+	sb->s_op = &yaffs_super_ops;
+	sb->s_flags |= MS_NOATIME;
+
+	read_only = ((sb->s_flags & MS_RDONLY) != 0);
+
+	sb->s_export_op = &yaffs_export_ops;
+
+	if (!sb->s_dev)
+		printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
+	else if (!yaffs_devname(sb, devname_buf))
+		printk(KERN_INFO "yaffs: devname is NULL\n");
+	else
+		printk(KERN_INFO "yaffs: dev is %d name is \"%s\" %s\n",
+		       sb->s_dev,
+		       yaffs_devname(sb, devname_buf), read_only ? "ro" : "rw");
+
+	if (!data_str)
+		data_str = "";
+
+	printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str);
+
+	memset(&options, 0, sizeof(options));
+
+	if (yaffs_parse_options(&options, data_str))
+		/* Option parsing failed */
+		return NULL;
+
+	sb->s_blocksize = PAGE_CACHE_SIZE;
+	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_read_super: Using yaffs%d", yaffs_version);
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_read_super: block size %d", (int)(sb->s_blocksize));
+
+	yaffs_trace(YAFFS_TRACE_ALWAYS,
+		"Attempting MTD mount of %u.%u,\"%s\"",
+		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) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"MTD device #%u doesn't appear to exist",
+			MINOR(sb->s_dev));
+		return NULL;
+	}
+	/* Check it's NAND */
+	if (mtd->type != MTD_NANDFLASH) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"MTD device is not NAND it's type %d",
+			mtd->type);
+		return NULL;
+	}
+
+	yaffs_trace(YAFFS_TRACE_OS, " erase %p", mtd->erase);
+	yaffs_trace(YAFFS_TRACE_OS, " read %p", mtd->read);
+	yaffs_trace(YAFFS_TRACE_OS, " write %p", mtd->write);
+	yaffs_trace(YAFFS_TRACE_OS, " readoob %p", mtd->read_oob);
+	yaffs_trace(YAFFS_TRACE_OS, " writeoob %p", mtd->write_oob);
+	yaffs_trace(YAFFS_TRACE_OS, " block_isbad %p", mtd->block_isbad);
+	yaffs_trace(YAFFS_TRACE_OS, " block_markbad %p", mtd->block_markbad);
+	yaffs_trace(YAFFS_TRACE_OS, " writesize %d", mtd->writesize);
+	yaffs_trace(YAFFS_TRACE_OS, " oobsize %d", mtd->oobsize);
+	yaffs_trace(YAFFS_TRACE_OS, " erasesize %d", mtd->erasesize);
+	yaffs_trace(YAFFS_TRACE_OS, " size %lld", mtd->size);
+
+#ifdef CONFIG_YAFFS_AUTO_YAFFS2
+
+	if (yaffs_version == 1 && mtd->writesize >= 2048) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs2");
+		yaffs_version = 2;
+	}
+
+	/* Added NCB 26/5/2006 for completeness */
+	if (yaffs_version == 2 && !options.inband_tags &&
+		mtd->writesize == 512) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs1");
+		yaffs_version = 1;
+	}
+#endif
+
+	if (yaffs_version == 2) {
+		/* Check for version 2 style functions */
+		if (!mtd->erase ||
+		    !mtd->block_isbad ||
+		    !mtd->block_markbad ||
+		    !mtd->read ||
+		    !mtd->write || !mtd->read_oob || !mtd->write_oob) {
+			yaffs_trace(YAFFS_TRACE_ALWAYS,
+				"MTD device does not support required functions");
+			return NULL;
+		}
+
+		if ((mtd->writesize < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
+		     mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
+		    !options.inband_tags) {
+			yaffs_trace(YAFFS_TRACE_ALWAYS,
+				"MTD device does not have the right page sizes");
+			return NULL;
+		}
+	} else {
+		/* Check for V1 style functions */
+		if (!mtd->erase ||
+		    !mtd->read ||
+		    !mtd->write || !mtd->read_oob || !mtd->write_oob) {
+			yaffs_trace(YAFFS_TRACE_ALWAYS,
+				"MTD device does not support required functions");
+			return NULL;
+		}
+
+		if (mtd->writesize < YAFFS_BYTES_PER_CHUNK ||
+		    mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
+			yaffs_trace(YAFFS_TRACE_ALWAYS,
+				"MTD device does not support have the right page sizes");
+			return NULL;
+		}
+	}
+
+	/* OK, so if we got here, we have an MTD that's NAND and looks
+	 * like it has the right capabilities
+	 * Set the struct yaffs_dev up for mtd
+	 */
+
+	if (!read_only && !(mtd->flags & MTD_WRITEABLE)) {
+		read_only = 1;
+		printk(KERN_INFO
+		       "yaffs: mtd is read only, setting superblock read only");
+		sb->s_flags |= MS_RDONLY;
+	}
+
+	dev = kmalloc(sizeof(struct yaffs_dev), GFP_KERNEL);
+	context = kmalloc(sizeof(struct yaffs_linux_context), GFP_KERNEL);
+
+	if (!dev || !context) {
+		kfree(dev);
+		kfree(context);
+		dev = NULL;
+		context = NULL;
+	}
+
+	if (!dev) {
+		/* Deep shit could not allocate device structure */
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"yaffs_read_super failed trying to allocate yaffs_dev");
+		return NULL;
+	}
+	memset(dev, 0, sizeof(struct yaffs_dev));
+	param = &(dev->param);
+
+	memset(context, 0, sizeof(struct yaffs_linux_context));
+	dev->os_context = context;
+	INIT_LIST_HEAD(&(context->context_list));
+	context->dev = dev;
+	context->super = sb;
+
+	dev->read_only = read_only;
+
+	sb->s_fs_info = dev;
+
+	dev->driver_context = mtd;
+	param->name = mtd->name;
+
+	/* Set up the memory size parameters.... */
+
+	n_blocks =
+	    YCALCBLOCKS(mtd->size,
+			(YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK));
+
+	param->start_block = 0;
+	param->end_block = n_blocks - 1;
+	param->chunks_per_block = YAFFS_CHUNKS_PER_BLOCK;
+	param->total_bytes_per_chunk = YAFFS_BYTES_PER_CHUNK;
+	param->n_reserved_blocks = 5;
+	param->n_caches = (options.no_cache) ? 0 : 10;
+	param->inband_tags = options.inband_tags;
+
+#ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
+	param->disable_lazy_load = 1;
+#endif
+#ifdef CONFIG_YAFFS_XATTR
+	param->enable_xattr = 1;
+#endif
+	if (options.lazy_loading_overridden)
+		param->disable_lazy_load = !options.lazy_loading_enabled;
+
+#ifdef CONFIG_YAFFS_DISABLE_TAGS_ECC
+	param->no_tags_ecc = 1;
+#endif
+
+#ifdef CONFIG_YAFFS_DISABLE_BACKGROUND
+#else
+	param->defered_dir_update = 1;
+#endif
+
+	if (options.tags_ecc_overridden)
+		param->no_tags_ecc = !options.tags_ecc_on;
+
+#ifdef CONFIG_YAFFS_EMPTY_LOST_AND_FOUND
+	param->empty_lost_n_found = 1;
+#endif
+
+#ifdef CONFIG_YAFFS_DISABLE_BLOCK_REFRESHING
+	param->refresh_period = 0;
+#else
+	param->refresh_period = 500;
+#endif
+
+#ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
+	param->always_check_erased = 1;
+#endif
+
+	if (options.empty_lost_and_found_overridden)
+		param->empty_lost_n_found = options.empty_lost_and_found;
+
+	/* ... and the functions. */
+	if (yaffs_version == 2) {
+		param->write_chunk_tags_fn = nandmtd2_write_chunk_tags;
+		param->read_chunk_tags_fn = nandmtd2_read_chunk_tags;
+		param->bad_block_fn = nandmtd2_mark_block_bad;
+		param->query_block_fn = nandmtd2_query_block;
+		yaffs_dev_to_lc(dev)->spare_buffer =
+				kmalloc(mtd->oobsize, GFP_NOFS);
+		param->is_yaffs2 = 1;
+		param->total_bytes_per_chunk = mtd->writesize;
+		param->chunks_per_block = mtd->erasesize / mtd->writesize;
+		n_blocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
+
+		param->start_block = 0;
+		param->end_block = n_blocks - 1;
+	} else {
+		/* use the MTD interface in yaffs_mtdif1.c */
+		param->write_chunk_tags_fn = nandmtd1_write_chunk_tags;
+		param->read_chunk_tags_fn = nandmtd1_read_chunk_tags;
+		param->bad_block_fn = nandmtd1_mark_block_bad;
+		param->query_block_fn = nandmtd1_query_block;
+		param->is_yaffs2 = 0;
+	}
+	/* ... and common functions */
+	param->erase_fn = nandmtd_erase_block;
+	param->initialise_flash_fn = nandmtd_initialise;
+
+	yaffs_dev_to_lc(dev)->put_super_fn = yaffs_mtd_put_super;
+
+	param->sb_dirty_fn = yaffs_touch_super;
+	param->gc_control = yaffs_gc_control_callback;
+
+	yaffs_dev_to_lc(dev)->super = sb;
+
+#ifndef CONFIG_YAFFS_DOES_ECC
+	param->use_nand_ecc = 1;
+#endif
+
+	param->skip_checkpt_rd = options.skip_checkpoint_read;
+	param->skip_checkpt_wr = options.skip_checkpoint_write;
+
+	mutex_lock(&yaffs_context_lock);
+	/* Get a mount id */
+	for (mount_id = 0, found = 0; !found; mount_id++) {
+		found = 1;
+		list_for_each(l, &yaffs_context_list) {
+			context_iterator =
+				list_entry(l, struct yaffs_linux_context,
+					context_list);
+			if (context_iterator->mount_id == mount_id)
+				found = 0;
+		}
+	}
+	context->mount_id = mount_id;
+
+	list_add_tail(&(yaffs_dev_to_lc(dev)->context_list),
+		      &yaffs_context_list);
+	mutex_unlock(&yaffs_context_lock);
+
+	/* Directory search handling... */
+	INIT_LIST_HEAD(&(yaffs_dev_to_lc(dev)->search_contexts));
+	param->remove_obj_fn = yaffs_remove_obj_callback;
+
+	mutex_init(&(yaffs_dev_to_lc(dev)->gross_lock));
+
+	yaffs_gross_lock(dev);
+
+	err = yaffs_guts_initialise(dev);
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_read_super: guts initialised %s",
+		(err == YAFFS_OK) ? "OK" : "FAILED");
+
+	if (err == YAFFS_OK)
+		yaffs_bg_start(dev);
+
+	if (!context->bg_thread)
+		param->defered_dir_update = 0;
+
+	/* Release lock before yaffs_get_inode() */
+	yaffs_gross_unlock(dev);
+
+	/* Create root inode */
+	if (err == YAFFS_OK)
+		inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0, yaffs_root(dev));
+
+	if (!inode)
+		return NULL;
+
+	inode->i_op = &yaffs_dir_inode_operations;
+	inode->i_fop = &yaffs_dir_operations;
+
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: got root inode");
+
+	root = d_alloc_root(inode);
+
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: d_alloc_root done");
+
+	if (!root) {
+		iput(inode);
+		return NULL;
+	}
+	sb->s_root = root;
+	sb->s_dirt = !dev->is_checkpointed;
+	yaffs_trace(YAFFS_TRACE_ALWAYS,
+		"yaffs_read_super: is_checkpointed %d",
+		dev->is_checkpointed);
+
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: done");
+	return sb;
+}
+
+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;
+}
+
+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);
+}
+
+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,
+};
+
+#ifdef CONFIG_YAFFS_YAFFS2
+
+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;
+}
+
+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);
+}
+
+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,
+};
+#endif /* CONFIG_YAFFS_YAFFS2 */
+
+static struct proc_dir_entry *my_proc_entry;
+
+static char *yaffs_dump_dev_part0(char *buf, struct yaffs_dev *dev)
+{
+	struct yaffs_param *param = &dev->param;
+
+	buf += sprintf(buf, "start_block........... %d\n", param->start_block);
+	buf += sprintf(buf, "end_block............. %d\n", param->end_block);
+	buf += sprintf(buf, "total_bytes_per_chunk. %d\n",
+			param->total_bytes_per_chunk);
+	buf += sprintf(buf, "use_nand_ecc.......... %d\n",
+			param->use_nand_ecc);
+	buf += sprintf(buf, "no_tags_ecc........... %d\n", param->no_tags_ecc);
+	buf += sprintf(buf, "is_yaffs2............. %d\n", param->is_yaffs2);
+	buf += sprintf(buf, "inband_tags........... %d\n", param->inband_tags);
+	buf += sprintf(buf, "empty_lost_n_found.... %d\n",
+			param->empty_lost_n_found);
+	buf += sprintf(buf, "disable_lazy_load..... %d\n",
+			param->disable_lazy_load);
+	buf += sprintf(buf, "refresh_period........ %d\n",
+			param->refresh_period);
+	buf += sprintf(buf, "n_caches.............. %d\n", param->n_caches);
+	buf += sprintf(buf, "n_reserved_blocks..... %d\n",
+			param->n_reserved_blocks);
+	buf += sprintf(buf, "always_check_erased... %d\n",
+			param->always_check_erased);
+
+	return buf;
+}
+
+static char *yaffs_dump_dev_part1(char *buf, struct yaffs_dev *dev)
+{
+	buf +=
+	    sprintf(buf, "data_bytes_per_chunk.. %d\n",
+		    dev->data_bytes_per_chunk);
+	buf += sprintf(buf, "chunk_grp_bits........ %d\n", dev->chunk_grp_bits);
+	buf += sprintf(buf, "chunk_grp_size........ %d\n", dev->chunk_grp_size);
+	buf +=
+	    sprintf(buf, "n_erased_blocks....... %d\n", dev->n_erased_blocks);
+	buf +=
+	    sprintf(buf, "blocks_in_checkpt..... %d\n", dev->blocks_in_checkpt);
+	buf += sprintf(buf, "\n");
+	buf += sprintf(buf, "n_tnodes.............. %d\n", dev->n_tnodes);
+	buf += sprintf(buf, "n_obj................. %d\n", dev->n_obj);
+	buf += sprintf(buf, "n_free_chunks......... %d\n", dev->n_free_chunks);
+	buf += sprintf(buf, "\n");
+	buf += sprintf(buf, "n_page_writes......... %u\n", dev->n_page_writes);
+	buf += sprintf(buf, "n_page_reads.......... %u\n", dev->n_page_reads);
+	buf += sprintf(buf, "n_erasures............ %u\n", dev->n_erasures);
+	buf += sprintf(buf, "n_gc_copies........... %u\n", dev->n_gc_copies);
+	buf += sprintf(buf, "all_gcs............... %u\n", dev->all_gcs);
+	buf +=
+	    sprintf(buf, "passive_gc_count...... %u\n", dev->passive_gc_count);
+	buf +=
+	    sprintf(buf, "oldest_dirty_gc_count. %u\n",
+		    dev->oldest_dirty_gc_count);
+	buf += sprintf(buf, "n_gc_blocks........... %u\n", dev->n_gc_blocks);
+	buf += sprintf(buf, "bg_gcs................ %u\n", dev->bg_gcs);
+	buf +=
+	    sprintf(buf, "n_retired_writes...... %u\n", dev->n_retired_writes);
+	buf +=
+	    sprintf(buf, "n_retired_blocks...... %u\n", dev->n_retired_blocks);
+	buf += sprintf(buf, "n_ecc_fixed........... %u\n", dev->n_ecc_fixed);
+	buf += sprintf(buf, "n_ecc_unfixed......... %u\n", dev->n_ecc_unfixed);
+	buf +=
+	    sprintf(buf, "n_tags_ecc_fixed...... %u\n", dev->n_tags_ecc_fixed);
+	buf +=
+	    sprintf(buf, "n_tags_ecc_unfixed.... %u\n",
+		    dev->n_tags_ecc_unfixed);
+	buf += sprintf(buf, "cache_hits............ %u\n", dev->cache_hits);
+	buf +=
+	    sprintf(buf, "n_deleted_files....... %u\n", dev->n_deleted_files);
+	buf +=
+	    sprintf(buf, "n_unlinked_files...... %u\n", dev->n_unlinked_files);
+	buf += sprintf(buf, "refresh_count......... %u\n", dev->refresh_count);
+	buf += sprintf(buf, "n_bg_deletions........ %u\n", dev->n_bg_deletions);
+
+	return buf;
+}
+
+static int yaffs_proc_read(char *page,
+			   char **start,
+			   off_t offset, int count, int *eof, void *data)
+{
+	struct list_head *item;
+	char *buf = page;
+	int step = offset;
+	int n = 0;
+
+	/* Get proc_file_read() to step 'offset' by one on each sucessive call.
+	 * We use 'offset' (*ppos) to indicate where we are in dev_list.
+	 * This also assumes the user has posted a read buffer large
+	 * enough to hold the complete output; but that's life in /proc.
+	 */
+
+	*(int *)start = 1;
+
+	/* Print header first */
+	if (step == 0)
+		buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__ "\n");
+	else if (step == 1)
+		buf += sprintf(buf, "\n");
+	else {
+		step -= 2;
+
+		mutex_lock(&yaffs_context_lock);
+
+		/* Locate and print the Nth entry.
+		 * Order N-squared but N is small. */
+		list_for_each(item, &yaffs_context_list) {
+			struct yaffs_linux_context *dc =
+			    list_entry(item, struct yaffs_linux_context,
+				       context_list);
+			struct yaffs_dev *dev = dc->dev;
+
+			if (n < (step & ~1)) {
+				n += 2;
+				continue;
+			}
+			if ((step & 1) == 0) {
+				buf +=
+				    sprintf(buf, "\nDevice %d \"%s\"\n", n,
+					    dev->param.name);
+				buf = yaffs_dump_dev_part0(buf, dev);
+			} else {
+				buf = yaffs_dump_dev_part1(buf, dev);
+			}
+
+			break;
+		}
+		mutex_unlock(&yaffs_context_lock);
+	}
+
+	return buf - page < count ? buf - page : count;
+}
+
+
+/**
+ * Set the verbosity of the warnings and error messages.
+ *
+ * Note that the names can only be a..z or _ with the current code.
+ */
+
+static struct {
+	char *mask_name;
+	unsigned mask_bitfield;
+} mask_flags[] = {
+	{"allocate", YAFFS_TRACE_ALLOCATE},
+	{"always", YAFFS_TRACE_ALWAYS},
+	{"background", YAFFS_TRACE_BACKGROUND},
+	{"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
+	{"buffers", YAFFS_TRACE_BUFFERS},
+	{"bug", YAFFS_TRACE_BUG},
+	{"checkpt", YAFFS_TRACE_CHECKPOINT},
+	{"deletion", YAFFS_TRACE_DELETION},
+	{"erase", YAFFS_TRACE_ERASE},
+	{"error", YAFFS_TRACE_ERROR},
+	{"gc_detail", YAFFS_TRACE_GC_DETAIL},
+	{"gc", YAFFS_TRACE_GC},
+	{"lock", YAFFS_TRACE_LOCK},
+	{"mtd", YAFFS_TRACE_MTD},
+	{"nandaccess", YAFFS_TRACE_NANDACCESS},
+	{"os", YAFFS_TRACE_OS},
+	{"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
+	{"scan", YAFFS_TRACE_SCAN},
+	{"mount", YAFFS_TRACE_MOUNT},
+	{"tracing", YAFFS_TRACE_TRACING},
+	{"sync", YAFFS_TRACE_SYNC},
+	{"write", YAFFS_TRACE_WRITE},
+	{"verify", YAFFS_TRACE_VERIFY},
+	{"verify_nand", YAFFS_TRACE_VERIFY_NAND},
+	{"verify_full", YAFFS_TRACE_VERIFY_FULL},
+	{"verify_all", YAFFS_TRACE_VERIFY_ALL},
+	{"all", 0xffffffff},
+	{"none", 0},
+	{NULL, 0},
+};
+
+#define MAX_MASK_NAME_LENGTH 40
+static int yaffs_proc_write_trace_options(struct file *file, const char *buf,
+					  unsigned long count, void *data)
+{
+	unsigned rg = 0, mask_bitfield;
+	char *end;
+	char *mask_name;
+	const char *x;
+	char substring[MAX_MASK_NAME_LENGTH + 1];
+	int i;
+	int done = 0;
+	int add, len = 0;
+	int pos = 0;
+
+	rg = yaffs_trace_mask;
+
+	while (!done && (pos < count)) {
+		done = 1;
+		while ((pos < count) && isspace(buf[pos]))
+			pos++;
+
+		switch (buf[pos]) {
+		case '+':
+		case '-':
+		case '=':
+			add = buf[pos];
+			pos++;
+			break;
+
+		default:
+			add = ' ';
+			break;
+		}
+		mask_name = NULL;
+
+		mask_bitfield = simple_strtoul(buf + pos, &end, 0);
+
+		if (end > buf + pos) {
+			mask_name = "numeral";
+			len = end - (buf + pos);
+			pos += len;
+			done = 0;
+		} else {
+			for (x = buf + pos, i = 0;
+			     (*x == '_' || (*x >= 'a' && *x <= 'z')) &&
+			     i < MAX_MASK_NAME_LENGTH; x++, i++, pos++)
+				substring[i] = *x;
+			substring[i] = '\0';
+
+			for (i = 0; mask_flags[i].mask_name != NULL; i++) {
+				if (strcmp(substring, mask_flags[i].mask_name)
+				    == 0) {
+					mask_name = mask_flags[i].mask_name;
+					mask_bitfield =
+					    mask_flags[i].mask_bitfield;
+					done = 0;
+					break;
+				}
+			}
+		}
+
+		if (mask_name != NULL) {
+			done = 0;
+			switch (add) {
+			case '-':
+				rg &= ~mask_bitfield;
+				break;
+			case '+':
+				rg |= mask_bitfield;
+				break;
+			case '=':
+				rg = mask_bitfield;
+				break;
+			default:
+				rg |= mask_bitfield;
+				break;
+			}
+		}
+	}
+
+	yaffs_trace_mask = rg | YAFFS_TRACE_ALWAYS;
+
+	printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_trace_mask);
+
+	if (rg & YAFFS_TRACE_ALWAYS) {
+		for (i = 0; mask_flags[i].mask_name != NULL; i++) {
+			char flag;
+			flag = ((rg & mask_flags[i].mask_bitfield) ==
+				mask_flags[i].mask_bitfield) ? '+' : '-';
+			printk(KERN_DEBUG "%c%s\n", flag,
+			       mask_flags[i].mask_name);
+		}
+	}
+
+	return count;
+}
+
+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;
+
+	yaffs_trace(YAFFS_TRACE_ALWAYS,
+		"yaffs built " __DATE__ " " __TIME__ " Installing.");
+
+#ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
+	yaffs_trace(YAFFS_TRACE_ALWAYS,
+		"\n\nYAFFS-WARNING CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED selected.\n\n\n");
+#endif
+
+	mutex_init(&yaffs_context_lock);
+
+	/* Install the proc_fs entries */
+	my_proc_entry = create_proc_entry("yaffs",
+					  S_IRUGO | S_IFREG, NULL);
+
+	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;
+	}
+
+
+	/* Now add the file system entries */
+
+	fsinst = fs_to_install;
+
+	while (fsinst->fst && !error) {
+		error = register_filesystem(fsinst->fst);
+		if (!error)
+			fsinst->installed = 1;
+		fsinst++;
+	}
+
+	/* Any errors? uninstall  */
+	if (error) {
+		fsinst = fs_to_install;
+
+		while (fsinst->fst) {
+			if (fsinst->installed) {
+				unregister_filesystem(fsinst->fst);
+				fsinst->installed = 0;
+			}
+			fsinst++;
+		}
+	}
+
+	return error;
+}
+
+static void __exit exit_yaffs_fs(void)
+{
+
+	struct file_system_to_install *fsinst;
+
+	yaffs_trace(YAFFS_TRACE_ALWAYS,
+		"yaffs built " __DATE__ " " __TIME__ " removing.");
+
+	remove_proc_entry("yaffs", NULL);
+
+	fsinst = fs_to_install;
+
+	while (fsinst->fst) {
+		if (fsinst->installed) {
+			unregister_filesystem(fsinst->fst);
+			fsinst->installed = 0;
+		}
+		fsinst++;
+	}
+}
+
+module_init(init_yaffs_fs)
+module_exit(exit_yaffs_fs)
+
+MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
+MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2011");
+MODULE_LICENSE("GPL");
diff --git a/fs/yaffs2/yportenv.h b/fs/yaffs2/yportenv.h
new file mode 100644
index 0000000..aa7c22b
--- /dev/null
+++ b/fs/yaffs2/yportenv.h
@@ -0,0 +1,59 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@xxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YPORTENV_LINUX_H__
+#define __YPORTENV_LINUX_H__
+
+#include <linux/version.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/xattr.h>
+#include <linux/list.h>
+#include <linux/types.h>
+#include <linux/fs.h>
+#include <linux/stat.h>
+#include <linux/sort.h>
+#include <linux/bitops.h>
+
+/*  These type wrappings are used to support Unicode names in WinCE. */
+#define YCHAR char
+#define YUCHAR unsigned char
+#define _Y(x)     x
+
+#define YAFFS_LOSTNFOUND_NAME		"lost+found"
+#define YAFFS_LOSTNFOUND_PREFIX		"obj"
+
+
+#define YAFFS_ROOT_MODE			0755
+#define YAFFS_LOSTNFOUND_MODE		0700
+
+#define Y_CURRENT_TIME CURRENT_TIME.tv_sec
+#define Y_TIME_CONVERT(x) (x).tv_sec
+
+#define compile_time_assertion(assertion) \
+	({ int x = __builtin_choose_expr(assertion, 0, (void)0); (void) x; })
+
+
+#define yaffs_trace(msk, fmt, ...) do { \
+	if (yaffs_trace_mask & (msk)) \
+		printk(KERN_DEBUG "yaffs: " fmt "\n", ##__VA_ARGS__); \
+} while (0)
+
+
+#endif
-- 
1.7.1

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