kernel: remove yaffs2 support, it is no longer needed

Signed-off-by: Felix Fietkau <[email protected]>

target/linux/generic/config-3.18

@@ -4621,8 +4621,6 @@ CONFIG_XZ_DEC=y
 # CONFIG_XZ_DEC_SPARC is not set
 # CONFIG_XZ_DEC_TEST is not set
 # CONFIG_XZ_DEC_X86 is not set
-# CONFIG_YAFFS_DISABLE_BAD_BLOCK_MARKING is not set
-# CONFIG_YAFFS_FS is not set
 # CONFIG_YAM is not set
 # CONFIG_YELLOWFIN is not set
 # CONFIG_YENTA is not set

target/linux/generic/config-4.4

@@ -4806,8 +4806,6 @@ CONFIG_XZ_DEC=y
 # CONFIG_XZ_DEC_SPARC is not set
 # CONFIG_XZ_DEC_TEST is not set
 # CONFIG_XZ_DEC_X86 is not set
-# CONFIG_YAFFS_DISABLE_BAD_BLOCK_MARKING is not set
-# CONFIG_YAFFS_FS is not set
 # CONFIG_YAM is not set
 # CONFIG_YELLOWFIN is not set
 # CONFIG_YENTA is not set

target/linux/generic/files/fs/yaffs2/Kconfig

@@ -1,171 +0,0 @@
-#
-# yaffs file system configurations
-#
-
-config YAFFS_FS
-	tristate "yaffs2 file system support"
-	default n
-	depends on MTD_BLOCK
-	select YAFFS_YAFFS1
-	select YAFFS_YAFFS2
-	help
-	  yaffs2, or Yet Another Flash File System, is a file system
-	  optimised for NAND Flash chips.
-
-	  To compile the yaffs2 file system support as a module, choose M
-	  here: the module will be called yaffs2.
-
-	  If unsure, say N.
-
-	  Further information on yaffs2 is available at
-	  <http://www.aleph1.co.uk/yaffs/>.
-
-config YAFFS_YAFFS1
-	bool "512 byte / page devices"
-	depends on YAFFS_FS
-	default y
-	help
-	  Enable yaffs1 support -- yaffs for 512 byte / page devices
-
-	  Not needed for 2K-page devices.
-
-	  If unsure, say Y.
-
-config YAFFS_9BYTE_TAGS
-	bool "Use older-style on-NAND data format with pageStatus byte"
-	depends on YAFFS_YAFFS1
-	default n
-	help
-
-	  Older-style on-NAND data format has a "pageStatus" byte to record
-	  chunk/page state.  This byte is zero when the page is discarded.
-	  Choose this option if you have existing on-NAND data using this
-	  format that you need to continue to support.  New data written
-	  also uses the older-style format.  Note: Use of this option
-	  generally requires that MTD's oob layout be adjusted to use the
-	  older-style format.  See notes on tags formats and MTD versions
-	  in yaffs_mtdif1.c.
-
-	  If unsure, say N.
-
-config YAFFS_DOES_ECC
-	bool "Lets yaffs do its own ECC"
-	depends on YAFFS_FS && YAFFS_YAFFS1 && !YAFFS_9BYTE_TAGS
-	default n
-	help
-	  This enables yaffs to use its own ECC functions instead of using
-	  the ones from the generic MTD-NAND driver.
-
-	  If unsure, say N.
-
-config YAFFS_ECC_WRONG_ORDER
-	bool "Use the same ecc byte order as Steven Hill's nand_ecc.c"
-	depends on YAFFS_FS && YAFFS_DOES_ECC && !YAFFS_9BYTE_TAGS
-	default n
-	help
-	  This makes yaffs_ecc.c use the same ecc byte order as Steven
-	  Hill's nand_ecc.c. If not set, then you get the same ecc byte
-	  order as SmartMedia.
-
-	  If unsure, say N.
-
-config YAFFS_YAFFS2
-	bool "2048 byte (or larger) / page devices"
-	depends on YAFFS_FS
-	default y
-	help
-	  Enable yaffs2 support -- yaffs for >= 2K bytes per page devices
-
-	  If unsure, say Y.
-
-config YAFFS_AUTO_YAFFS2
-	bool "Autoselect yaffs2 format"
-	depends on YAFFS_YAFFS2
-	default y
-	help
-	  Without this, you need to explicitely use yaffs2 as the file
-	  system type. With this, you can say "yaffs" and yaffs or yaffs2
-	  will be used depending on the device page size (yaffs on
-	  512-byte page devices, yaffs2 on 2K page devices).
-
-	  If unsure, say Y.
-
-config YAFFS_DISABLE_TAGS_ECC
-	bool "Disable yaffs from doing ECC on tags by default"
-	depends on YAFFS_FS && YAFFS_YAFFS2
-	default n
-	help
-	  This defaults yaffs to using its own ECC calculations on tags instead of
-	  just relying on the MTD.
-	  This behavior can also be overridden with tags_ecc_on and
-	  tags_ecc_off mount options.
-
-	  If unsure, say N.
-
-config YAFFS_ALWAYS_CHECK_CHUNK_ERASED
-	bool "Force chunk erase check"
-	depends on YAFFS_FS
-	default n
-	help
-          Normally yaffs only checks chunks before writing until an erased
-	  chunk is found. This helps to detect any partially written
-	  chunks that might have happened due to power loss.
-
-	  Enabling this forces on the test that chunks are erased in flash
-	  before writing to them. This takes more time but is potentially
-	  a bit more secure.
-
-	  Suggest setting Y during development and ironing out driver
-	  issues etc. Suggest setting to N if you want faster writing.
-
-	  If unsure, say Y.
-
-config YAFFS_EMPTY_LOST_AND_FOUND
-	bool "Empty lost and found on boot"
-	depends on YAFFS_FS
-	default n
-	help
-	  If this is enabled then the contents of lost and found is
-	  automatically dumped at mount.
-
-	  If unsure, say N.
-
-config YAFFS_DISABLE_BLOCK_REFRESHING
-	bool "Disable yaffs2 block refreshing"
-	depends on YAFFS_FS
-	default n
-	help
-	 If this is set, then block refreshing is disabled.
-	 Block refreshing infrequently refreshes the oldest block in
-	 a yaffs2 file system. This mechanism helps to refresh flash to
-	 mitigate against data loss. This is particularly useful for MLC.
-
-	  If unsure, say N.
-
-config YAFFS_DISABLE_BACKGROUND
-	bool "Disable yaffs2 background processing"
-	depends on YAFFS_FS
-	default n
-	help
-	 If this is set, then background processing is disabled.
-	 Background processing makes many foreground activities faster.
-
-	 If unsure, say N.
-
-config YAFFS_DISABLE_BAD_BLOCK_MARKING
-	bool "Disable yaffs2 bad block marking"
-	depends on YAFFS_FS
-	default n
-	help
-	 Useful during early flash bring up to prevent problems causing
-	 lots of bad block marking.
-
-	 If unsure, say N.
-
-config YAFFS_XATTR
-	bool "Enable yaffs2 xattr support"
-	depends on YAFFS_FS
-	default y
-	help
-	 If this is set then yaffs2 will provide xattr support.
-	 If unsure, say Y.

target/linux/generic/files/fs/yaffs2/Makefile

@@ -1,18 +0,0 @@
-#
-# Makefile for the linux YAFFS filesystem routines.
-#
-
-obj-$(CONFIG_YAFFS_FS) += yaffs.o
-
-yaffs-y := yaffs_ecc.o yaffs_vfs.o yaffs_guts.o yaffs_checkptrw.o
-yaffs-y += yaffs_packedtags1.o yaffs_packedtags2.o yaffs_nand.o
-yaffs-y += yaffs_tagscompat.o yaffs_tagsmarshall.o
-yaffs-y += yaffs_mtdif.o
-yaffs-y += yaffs_nameval.o yaffs_attribs.o
-yaffs-y += yaffs_allocator.o
-yaffs-y += yaffs_yaffs1.o
-yaffs-y += yaffs_yaffs2.o
-yaffs-y += yaffs_bitmap.o
-yaffs-y += yaffs_summary.o
-yaffs-y += yaffs_verify.o
-

target/linux/generic/files/fs/yaffs2/NOTE.openwrt

@@ -1,4 +0,0 @@
-The yaffs2 source has been fetched from the yaffs2 GIT tree.
-
-URL: git://www.aleph1.co.uk/yaffs2
-Version: 583dbd9cc2668870cb013f051ba59f7d3e513dae (2015-06-02)

target/linux/generic/files/fs/yaffs2/yaffs_allocator.c

@@ -1,357 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include "yaffs_allocator.h"
-#include "yaffs_guts.h"
-#include "yaffs_trace.h"
-#include "yportenv.h"
-
-/*
- * Each entry in yaffs_tnode_list and yaffs_obj_list hold blocks
- * of approx 100 objects that are themn allocated singly.
- * This is basically a simplified slab allocator.
- *
- * We don't use the Linux slab allocator because slab does not allow
- * us to dump all the objects in one hit when we do a umount and tear
- * down  all the tnodes and objects. slab requires that we first free
- * the individual objects.
- *
- * Once yaffs has been mainlined I shall try to motivate for a change
- * to slab to provide the extra features we need here.
- */
-
-struct yaffs_tnode_list {
-	struct yaffs_tnode_list *next;
-	struct yaffs_tnode *tnodes;
-};
-
-struct yaffs_obj_list {
-	struct yaffs_obj_list *next;
-	struct yaffs_obj *objects;
-};
-
-struct yaffs_allocator {
-	int n_tnodes_created;
-	struct yaffs_tnode *free_tnodes;
-	int n_free_tnodes;
-	struct yaffs_tnode_list *alloc_tnode_list;
-
-	int n_obj_created;
-	struct list_head free_objs;
-	int n_free_objects;
-
-	struct yaffs_obj_list *allocated_obj_list;
-};
-
-static void yaffs_deinit_raw_tnodes(struct yaffs_dev *dev)
-{
-	struct yaffs_allocator *allocator =
-	    (struct yaffs_allocator *)dev->allocator;
-	struct yaffs_tnode_list *tmp;
-
-	if (!allocator) {
-		BUG();
-		return;
-	}
-
-	while (allocator->alloc_tnode_list) {
-		tmp = allocator->alloc_tnode_list->next;
-
-		kfree(allocator->alloc_tnode_list->tnodes);
-		kfree(allocator->alloc_tnode_list);
-		allocator->alloc_tnode_list = tmp;
-	}
-
-	allocator->free_tnodes = NULL;
-	allocator->n_free_tnodes = 0;
-	allocator->n_tnodes_created = 0;
-}
-
-static void yaffs_init_raw_tnodes(struct yaffs_dev *dev)
-{
-	struct yaffs_allocator *allocator = dev->allocator;
-
-	if (!allocator) {
-		BUG();
-		return;
-	}
-
-	allocator->alloc_tnode_list = NULL;
-	allocator->free_tnodes = NULL;
-	allocator->n_free_tnodes = 0;
-	allocator->n_tnodes_created = 0;
-}
-
-static int yaffs_create_tnodes(struct yaffs_dev *dev, int n_tnodes)
-{
-	struct yaffs_allocator *allocator =
-	    (struct yaffs_allocator *)dev->allocator;
-	int i;
-	struct yaffs_tnode *new_tnodes;
-	u8 *mem;
-	struct yaffs_tnode *curr;
-	struct yaffs_tnode *next;
-	struct yaffs_tnode_list *tnl;
-
-	if (!allocator) {
-		BUG();
-		return YAFFS_FAIL;
-	}
-
-	if (n_tnodes < 1)
-		return YAFFS_OK;
-
-	/* make these things */
-	new_tnodes = kmalloc(n_tnodes * dev->tnode_size, GFP_NOFS);
-	mem = (u8 *) new_tnodes;
-
-	if (!new_tnodes) {
-		yaffs_trace(YAFFS_TRACE_ERROR,
-			"yaffs: Could not allocate Tnodes");
-		return YAFFS_FAIL;
-	}
-
-	/* New hookup for wide tnodes */
-	for (i = 0; i < n_tnodes - 1; i++) {
-		curr = (struct yaffs_tnode *)&mem[i * dev->tnode_size];
-		next = (struct yaffs_tnode *)&mem[(i + 1) * dev->tnode_size];
-		curr->internal[0] = next;
-	}
-
-	curr = (struct yaffs_tnode *)&mem[(n_tnodes - 1) * dev->tnode_size];
-	curr->internal[0] = allocator->free_tnodes;
-	allocator->free_tnodes = (struct yaffs_tnode *)mem;
-
-	allocator->n_free_tnodes += n_tnodes;
-	allocator->n_tnodes_created += n_tnodes;
-
-	/* Now add this bunch of tnodes to a list for freeing up.
-	 * NB If we can't add this to the management list it isn't fatal
-	 * but it just means we can't free this bunch of tnodes later.
-	 */
-	tnl = kmalloc(sizeof(struct yaffs_tnode_list), GFP_NOFS);
-	if (!tnl) {
-		yaffs_trace(YAFFS_TRACE_ERROR,
-			"Could not add tnodes to management list");
-		return YAFFS_FAIL;
-	} else {
-		tnl->tnodes = new_tnodes;
-		tnl->next = allocator->alloc_tnode_list;
-		allocator->alloc_tnode_list = tnl;
-	}
-
-	yaffs_trace(YAFFS_TRACE_ALLOCATE, "Tnodes added");
-
-	return YAFFS_OK;
-}
-
-struct yaffs_tnode *yaffs_alloc_raw_tnode(struct yaffs_dev *dev)
-{
-	struct yaffs_allocator *allocator =
-	    (struct yaffs_allocator *)dev->allocator;
-	struct yaffs_tnode *tn = NULL;
-
-	if (!allocator) {
-		BUG();
-		return NULL;
-	}
-
-	/* If there are none left make more */
-	if (!allocator->free_tnodes)
-		yaffs_create_tnodes(dev, YAFFS_ALLOCATION_NTNODES);
-
-	if (allocator->free_tnodes) {
-		tn = allocator->free_tnodes;
-		allocator->free_tnodes = allocator->free_tnodes->internal[0];
-		allocator->n_free_tnodes--;
-	}
-
-	return tn;
-}
-
-/* FreeTnode frees up a tnode and puts it back on the free list */
-void yaffs_free_raw_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
-{
-	struct yaffs_allocator *allocator = dev->allocator;
-
-	if (!allocator) {
-		BUG();
-		return;
-	}
-
-	if (tn) {
-		tn->internal[0] = allocator->free_tnodes;
-		allocator->free_tnodes = tn;
-		allocator->n_free_tnodes++;
-	}
-	dev->checkpoint_blocks_required = 0;	/* force recalculation */
-}
-
-/*--------------- yaffs_obj alloaction ------------------------
- *
- * Free yaffs_objs are stored in a list using obj->siblings.
- * The blocks of allocated objects are stored in a linked list.
- */
-
-static void yaffs_init_raw_objs(struct yaffs_dev *dev)
-{
-	struct yaffs_allocator *allocator = dev->allocator;
-
-	if (!allocator) {
-		BUG();
-		return;
-	}
-
-	allocator->allocated_obj_list = NULL;
-	INIT_LIST_HEAD(&allocator->free_objs);
-	allocator->n_free_objects = 0;
-}
-
-static void yaffs_deinit_raw_objs(struct yaffs_dev *dev)
-{
-	struct yaffs_allocator *allocator = dev->allocator;
-	struct yaffs_obj_list *tmp;
-
-	if (!allocator) {
-		BUG();
-		return;
-	}
-
-	while (allocator->allocated_obj_list) {
-		tmp = allocator->allocated_obj_list->next;
-		kfree(allocator->allocated_obj_list->objects);
-		kfree(allocator->allocated_obj_list);
-		allocator->allocated_obj_list = tmp;
-	}
-
-	INIT_LIST_HEAD(&allocator->free_objs);
-	allocator->n_free_objects = 0;
-	allocator->n_obj_created = 0;
-}
-
-static int yaffs_create_free_objs(struct yaffs_dev *dev, int n_obj)
-{
-	struct yaffs_allocator *allocator = dev->allocator;
-	int i;
-	struct yaffs_obj *new_objs;
-	struct yaffs_obj_list *list;
-
-	if (!allocator) {
-		BUG();
-		return YAFFS_FAIL;
-	}
-
-	if (n_obj < 1)
-		return YAFFS_OK;
-
-	/* make these things */
-	new_objs = kmalloc(n_obj * sizeof(struct yaffs_obj), GFP_NOFS);
-	list = kmalloc(sizeof(struct yaffs_obj_list), GFP_NOFS);
-
-	if (!new_objs || !list) {
-		kfree(new_objs);
-		new_objs = NULL;
-		kfree(list);
-		list = NULL;
-		yaffs_trace(YAFFS_TRACE_ALLOCATE,
-			"Could not allocate more objects");
-		return YAFFS_FAIL;
-	}
-
-	/* Hook them into the free list */
-	for (i = 0; i < n_obj; i++)
-		list_add(&new_objs[i].siblings, &allocator->free_objs);
-
-	allocator->n_free_objects += n_obj;
-	allocator->n_obj_created += n_obj;
-
-	/* Now add this bunch of Objects to a list for freeing up. */
-
-	list->objects = new_objs;
-	list->next = allocator->allocated_obj_list;
-	allocator->allocated_obj_list = list;
-
-	return YAFFS_OK;
-}
-
-struct yaffs_obj *yaffs_alloc_raw_obj(struct yaffs_dev *dev)
-{
-	struct yaffs_obj *obj = NULL;
-	struct list_head *lh;
-	struct yaffs_allocator *allocator = dev->allocator;
-
-	if (!allocator) {
-		BUG();
-		return obj;
-	}
-
-	/* If there are none left make more */
-	if (list_empty(&allocator->free_objs))
-		yaffs_create_free_objs(dev, YAFFS_ALLOCATION_NOBJECTS);
-
-	if (!list_empty(&allocator->free_objs)) {
-		lh = allocator->free_objs.next;
-		obj = list_entry(lh, struct yaffs_obj, siblings);
-		list_del_init(lh);
-		allocator->n_free_objects--;
-	}
-
-	return obj;
-}
-
-void yaffs_free_raw_obj(struct yaffs_dev *dev, struct yaffs_obj *obj)
-{
-
-	struct yaffs_allocator *allocator = dev->allocator;
-
-	if (!allocator) {
-		BUG();
-		return;
-	}
-
-	/* Link into the free list. */
-	list_add(&obj->siblings, &allocator->free_objs);
-	allocator->n_free_objects++;
-}
-
-void yaffs_deinit_raw_tnodes_and_objs(struct yaffs_dev *dev)
-{
-
-	if (!dev->allocator) {
-		BUG();
-		return;
-	}
-
-	yaffs_deinit_raw_tnodes(dev);
-	yaffs_deinit_raw_objs(dev);
-	kfree(dev->allocator);
-	dev->allocator = NULL;
-}
-
-void yaffs_init_raw_tnodes_and_objs(struct yaffs_dev *dev)
-{
-	struct yaffs_allocator *allocator;
-
-	if (dev->allocator) {
-		BUG();
-		return;
-	}
-
-	allocator = kmalloc(sizeof(struct yaffs_allocator), GFP_NOFS);
-	if (allocator) {
-		dev->allocator = allocator;
-		yaffs_init_raw_tnodes(dev);
-		yaffs_init_raw_objs(dev);
-	}
-}
-

target/linux/generic/files/fs/yaffs2/yaffs_allocator.h

@@ -1,30 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License version 2.1 as
- * published by the Free Software Foundation.
- *
- * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
- */
-
-#ifndef __YAFFS_ALLOCATOR_H__
-#define __YAFFS_ALLOCATOR_H__
-
-#include "yaffs_guts.h"
-
-void yaffs_init_raw_tnodes_and_objs(struct yaffs_dev *dev);
-void yaffs_deinit_raw_tnodes_and_objs(struct yaffs_dev *dev);
-
-struct yaffs_tnode *yaffs_alloc_raw_tnode(struct yaffs_dev *dev);
-void yaffs_free_raw_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn);
-
-struct yaffs_obj *yaffs_alloc_raw_obj(struct yaffs_dev *dev);
-void yaffs_free_raw_obj(struct yaffs_dev *dev, struct yaffs_obj *obj);
-
-#endif

target/linux/generic/files/fs/yaffs2/yaffs_attribs.c

@@ -1,132 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include "yaffs_guts.h"
-#include "yaffs_attribs.h"
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 14, 0))
-#define IATTR_UID ia_uid
-#define IATTR_GID ia_gid
-#else
-#define IATTR_UID ia_uid.val
-#define IATTR_GID ia_gid.val
-#endif
-
-void yaffs_load_attribs(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh)
-{
-	obj->yst_uid = oh->yst_uid;
-	obj->yst_gid = oh->yst_gid;
-	obj->yst_atime = oh->yst_atime;
-	obj->yst_mtime = oh->yst_mtime;
-	obj->yst_ctime = oh->yst_ctime;
-	obj->yst_rdev = oh->yst_rdev;
-}
-
-void yaffs_load_attribs_oh(struct yaffs_obj_hdr *oh, struct yaffs_obj *obj)
-{
-	oh->yst_uid = obj->yst_uid;
-	oh->yst_gid = obj->yst_gid;
-	oh->yst_atime = obj->yst_atime;
-	oh->yst_mtime = obj->yst_mtime;
-	oh->yst_ctime = obj->yst_ctime;
-	oh->yst_rdev = obj->yst_rdev;
-
-}
-
-void yaffs_load_current_time(struct yaffs_obj *obj, int do_a, int do_c)
-{
-	obj->yst_mtime = Y_CURRENT_TIME;
-	if (do_a)
-		obj->yst_atime = obj->yst_mtime;
-	if (do_c)
-		obj->yst_ctime = obj->yst_mtime;
-}
-
-void yaffs_attribs_init(struct yaffs_obj *obj, u32 gid, u32 uid, u32 rdev)
-{
-	yaffs_load_current_time(obj, 1, 1);
-	obj->yst_rdev = rdev;
-	obj->yst_uid = uid;
-	obj->yst_gid = gid;
-}
-
-static loff_t yaffs_get_file_size(struct yaffs_obj *obj)
-{
-	YCHAR *alias = NULL;
-	obj = yaffs_get_equivalent_obj(obj);
-
-	switch (obj->variant_type) {
-	case YAFFS_OBJECT_TYPE_FILE:
-		return obj->variant.file_variant.file_size;
-	case YAFFS_OBJECT_TYPE_SYMLINK:
-		alias = obj->variant.symlink_variant.alias;
-		if (!alias)
-			return 0;
-		return strnlen(alias, YAFFS_MAX_ALIAS_LENGTH);
-	default:
-		return 0;
-	}
-}
-
-int yaffs_set_attribs(struct yaffs_obj *obj, struct iattr *attr)
-{
-	unsigned int valid = attr->ia_valid;
-
-	if (valid & ATTR_MODE)
-		obj->yst_mode = attr->ia_mode;
-	if (valid & ATTR_UID)
-		obj->yst_uid = attr->IATTR_UID;
-	if (valid & ATTR_GID)
-		obj->yst_gid = attr->IATTR_GID;
-
-	if (valid & ATTR_ATIME)
-		obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
-	if (valid & ATTR_CTIME)
-		obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
-	if (valid & ATTR_MTIME)
-		obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
-
-	if (valid & ATTR_SIZE)
-		yaffs_resize_file(obj, attr->ia_size);
-
-	yaffs_update_oh(obj, NULL, 1, 0, 0, NULL);
-
-	return YAFFS_OK;
-
-}
-
-int yaffs_get_attribs(struct yaffs_obj *obj, struct iattr *attr)
-{
-	unsigned int valid = 0;
-
-	attr->ia_mode = obj->yst_mode;
-	valid |= ATTR_MODE;
-	attr->IATTR_UID = obj->yst_uid;
-	valid |= ATTR_UID;
-	attr->IATTR_GID = obj->yst_gid;
-	valid |= ATTR_GID;
-
-	Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
-	valid |= ATTR_ATIME;
-	Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
-	valid |= ATTR_CTIME;
-	Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
-	valid |= ATTR_MTIME;
-
-	attr->ia_size = yaffs_get_file_size(obj);
-	valid |= ATTR_SIZE;
-
-	attr->ia_valid = valid;
-
-	return YAFFS_OK;
-}

target/linux/generic/files/fs/yaffs2/yaffs_attribs.h

@@ -1,28 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License version 2.1 as
- * published by the Free Software Foundation.
- *
- * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
- */
-
-#ifndef __YAFFS_ATTRIBS_H__
-#define __YAFFS_ATTRIBS_H__
-
-#include "yaffs_guts.h"
-
-void yaffs_load_attribs(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh);
-void yaffs_load_attribs_oh(struct yaffs_obj_hdr *oh, struct yaffs_obj *obj);
-void yaffs_attribs_init(struct yaffs_obj *obj, u32 gid, u32 uid, u32 rdev);
-void yaffs_load_current_time(struct yaffs_obj *obj, int do_a, int do_c);
-int yaffs_set_attribs(struct yaffs_obj *obj, struct iattr *attr);
-int yaffs_get_attribs(struct yaffs_obj *obj, struct iattr *attr);
-
-#endif

target/linux/generic/files/fs/yaffs2/yaffs_bitmap.c

@@ -1,97 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include "yaffs_bitmap.h"
-#include "yaffs_trace.h"
-/*
- * Chunk bitmap manipulations
- */
-
-static inline u8 *yaffs_block_bits(struct yaffs_dev *dev, int blk)
-{
-	if (blk < dev->internal_start_block || blk > dev->internal_end_block) {
-		yaffs_trace(YAFFS_TRACE_ERROR,
-			"BlockBits block %d is not valid",
-			blk);
-		BUG();
-	}
-	return dev->chunk_bits +
-	    (dev->chunk_bit_stride * (blk - dev->internal_start_block));
-}
-
-void yaffs_verify_chunk_bit_id(struct yaffs_dev *dev, int blk, int chunk)
-{
-	if (blk < dev->internal_start_block || blk > dev->internal_end_block ||
-	    chunk < 0 || chunk >= dev->param.chunks_per_block) {
-		yaffs_trace(YAFFS_TRACE_ERROR,
-			"Chunk Id (%d:%d) invalid",
-			blk, chunk);
-		BUG();
-	}
-}
-
-void yaffs_clear_chunk_bits(struct yaffs_dev *dev, int blk)
-{
-	u8 *blk_bits = yaffs_block_bits(dev, blk);
-
-	memset(blk_bits, 0, dev->chunk_bit_stride);
-}
-
-void yaffs_clear_chunk_bit(struct yaffs_dev *dev, int blk, int chunk)
-{
-	u8 *blk_bits = yaffs_block_bits(dev, blk);
-
-	yaffs_verify_chunk_bit_id(dev, blk, chunk);
-	blk_bits[chunk / 8] &= ~(1 << (chunk & 7));
-}
-
-void yaffs_set_chunk_bit(struct yaffs_dev *dev, int blk, int chunk)
-{
-	u8 *blk_bits = yaffs_block_bits(dev, blk);
-
-	yaffs_verify_chunk_bit_id(dev, blk, chunk);
-	blk_bits[chunk / 8] |= (1 << (chunk & 7));
-}
-
-int yaffs_check_chunk_bit(struct yaffs_dev *dev, int blk, int chunk)
-{
-	u8 *blk_bits = yaffs_block_bits(dev, blk);
-
-	yaffs_verify_chunk_bit_id(dev, blk, chunk);
-	return (blk_bits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
-}
-
-int yaffs_still_some_chunks(struct yaffs_dev *dev, int blk)
-{
-	u8 *blk_bits = yaffs_block_bits(dev, blk);
-	int i;
-
-	for (i = 0; i < dev->chunk_bit_stride; i++) {
-		if (*blk_bits)
-			return 1;
-		blk_bits++;
-	}
-	return 0;
-}
-
-int yaffs_count_chunk_bits(struct yaffs_dev *dev, int blk)
-{
-	u8 *blk_bits = yaffs_block_bits(dev, blk);
-	int i;
-	int n = 0;
-
-	for (i = 0; i < dev->chunk_bit_stride; i++, blk_bits++)
-		n += hweight8(*blk_bits);
-
-	return n;
-}

target/linux/generic/files/fs/yaffs2/yaffs_bitmap.h

@@ -1,33 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License version 2.1 as
- * published by the Free Software Foundation.
- *
- * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
- */
-
-/*
- * Chunk bitmap manipulations
- */
-
-#ifndef __YAFFS_BITMAP_H__
-#define __YAFFS_BITMAP_H__
-
-#include "yaffs_guts.h"
-
-void yaffs_verify_chunk_bit_id(struct yaffs_dev *dev, int blk, int chunk);
-void yaffs_clear_chunk_bits(struct yaffs_dev *dev, int blk);
-void yaffs_clear_chunk_bit(struct yaffs_dev *dev, int blk, int chunk);
-void yaffs_set_chunk_bit(struct yaffs_dev *dev, int blk, int chunk);
-int yaffs_check_chunk_bit(struct yaffs_dev *dev, int blk, int chunk);
-int yaffs_still_some_chunks(struct yaffs_dev *dev, int blk);
-int yaffs_count_chunk_bits(struct yaffs_dev *dev, int blk);
-
-#endif

target/linux/generic/files/fs/yaffs2/yaffs_checkptrw.c

@@ -1,466 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include "yaffs_checkptrw.h"
-#include "yaffs_getblockinfo.h"
-
-struct yaffs_checkpt_chunk_hdr {
-	int version;
-	int seq;
-	u32 sum;
-	u32 xor;
-} ;
-
-
-static int apply_chunk_offset(struct yaffs_dev *dev, int chunk)
-{
-	return chunk - dev->chunk_offset;
-}
-
-static int apply_block_offset(struct yaffs_dev *dev, int block)
-{
-	return block - dev->block_offset;
-}
-
-static void yaffs2_checkpt_init_chunk_hdr(struct yaffs_dev *dev)
-{
-	struct yaffs_checkpt_chunk_hdr hdr;
-
-	hdr.version = YAFFS_CHECKPOINT_VERSION;
-	hdr.seq = dev->checkpt_page_seq;
-	hdr.sum = dev->checkpt_sum;
-	hdr.xor = dev->checkpt_xor;
-
-	dev->checkpt_byte_offs = sizeof(hdr);
-
-	memcpy(dev->checkpt_buffer, &hdr, sizeof(hdr));
-}
-
-static int yaffs2_checkpt_check_chunk_hdr(struct yaffs_dev *dev)
-{
-	struct yaffs_checkpt_chunk_hdr hdr;
-
-	memcpy(&hdr, dev->checkpt_buffer, sizeof(hdr));
-
-	dev->checkpt_byte_offs = sizeof(hdr);
-
-	return hdr.version == YAFFS_CHECKPOINT_VERSION &&
-		hdr.seq == dev->checkpt_page_seq &&
-		hdr.sum == dev->checkpt_sum &&
-		hdr.xor == dev->checkpt_xor;
-}
-
-static int yaffs2_checkpt_space_ok(struct yaffs_dev *dev)
-{
-	int blocks_avail = dev->n_erased_blocks - dev->param.n_reserved_blocks;
-
-	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
-		"checkpt blocks_avail = %d", blocks_avail);
-
-	return (blocks_avail <= 0) ? 0 : 1;
-}
-
-static int yaffs_checkpt_erase(struct yaffs_dev *dev)
-{
-	int i;
-
-	if (!dev->drv.drv_erase_fn)
-		return 0;
-	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
-		"checking blocks %d to %d",
-		dev->internal_start_block, dev->internal_end_block);
-
-	for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
-		struct yaffs_block_info *bi = yaffs_get_block_info(dev, i);
-		int offset_i = apply_block_offset(dev, i);
-		int result;
-
-		if (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT) {
-			yaffs_trace(YAFFS_TRACE_CHECKPOINT,
-			"erasing checkpt block %d", i);
-
-			dev->n_erasures++;
-
-			result = dev->drv.drv_erase_fn(dev, offset_i);
-			if(result) {
-				bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
-				dev->n_erased_blocks++;
-				dev->n_free_chunks +=
-				    dev->param.chunks_per_block;
-			} else {
-				dev->drv.drv_mark_bad_fn(dev, offset_i);
-				bi->block_state = YAFFS_BLOCK_STATE_DEAD;
-			}
-		}
-	}
-
-	dev->blocks_in_checkpt = 0;
-
-	return 1;
-}
-
-static void yaffs2_checkpt_find_erased_block(struct yaffs_dev *dev)
-{
-	int i;
-	int blocks_avail = dev->n_erased_blocks - dev->param.n_reserved_blocks;
-
-	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
-		"allocating checkpt block: erased %d reserved %d avail %d next %d ",
-		dev->n_erased_blocks, dev->param.n_reserved_blocks,
-		blocks_avail, dev->checkpt_next_block);
-
-	if (dev->checkpt_next_block >= 0 &&
-	    dev->checkpt_next_block <= dev->internal_end_block &&
-	    blocks_avail > 0) {
-
-		for (i = dev->checkpt_next_block; i <= dev->internal_end_block;
-		     i++) {
-			struct yaffs_block_info *bi;
-
-			bi = yaffs_get_block_info(dev, i);
-			if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
-				dev->checkpt_next_block = i + 1;
-				dev->checkpt_cur_block = i;
-				yaffs_trace(YAFFS_TRACE_CHECKPOINT,
-					"allocating checkpt block %d", i);
-				return;
-			}
-		}
-	}
-	yaffs_trace(YAFFS_TRACE_CHECKPOINT, "out of checkpt blocks");
-
-	dev->checkpt_next_block = -1;
-	dev->checkpt_cur_block = -1;
-}
-
-static void yaffs2_checkpt_find_block(struct yaffs_dev *dev)
-{
-	int i;
-	struct yaffs_ext_tags tags;
-
-	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
-		"find next checkpt block: start:  blocks %d next %d",
-		dev->blocks_in_checkpt, dev->checkpt_next_block);
-
-	if (dev->blocks_in_checkpt < dev->checkpt_max_blocks)
-		for (i = dev->checkpt_next_block; i <= dev->internal_end_block;
-		     i++) {
-			int chunk = i * dev->param.chunks_per_block;
-			enum yaffs_block_state state;
-			u32 seq;
-
-			dev->tagger.read_chunk_tags_fn(dev,
-					apply_chunk_offset(dev, chunk),
-					NULL, &tags);
-			yaffs_trace(YAFFS_TRACE_CHECKPOINT,
-				"find next checkpt block: search: block %d state %d oid %d seq %d eccr %d",
-				i, (int) state,
-				tags.obj_id, tags.seq_number,
-				tags.ecc_result);
-
-			if (tags.seq_number != YAFFS_SEQUENCE_CHECKPOINT_DATA)
-				continue;
-
-			dev->tagger.query_block_fn(dev,
-						apply_block_offset(dev, i),
-						&state, &seq);
-			if (state == YAFFS_BLOCK_STATE_DEAD)
-				continue;
-
-			/* Right kind of block */
-			dev->checkpt_next_block = tags.obj_id;
-			dev->checkpt_cur_block = i;
-			dev->checkpt_block_list[dev->blocks_in_checkpt] = i;
-			dev->blocks_in_checkpt++;
-			yaffs_trace(YAFFS_TRACE_CHECKPOINT,
-				"found checkpt block %d", i);
-			return;
-		}
-
-	yaffs_trace(YAFFS_TRACE_CHECKPOINT, "found no more checkpt blocks");
-
-	dev->checkpt_next_block = -1;
-	dev->checkpt_cur_block = -1;
-}
-
-int yaffs2_checkpt_open(struct yaffs_dev *dev, int writing)
-{
-	int i;
-
-	dev->checkpt_open_write = writing;
-
-	/* Got the functions we need? */
-	if (!dev->tagger.write_chunk_tags_fn ||
-	    !dev->tagger.read_chunk_tags_fn ||
-	    !dev->drv.drv_erase_fn ||
-	    !dev->drv.drv_mark_bad_fn)
-		return 0;
-
-	if (writing && !yaffs2_checkpt_space_ok(dev))
-		return 0;
-
-	if (!dev->checkpt_buffer)
-		dev->checkpt_buffer =
-		    kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
-	if (!dev->checkpt_buffer)
-		return 0;
-
-	dev->checkpt_page_seq = 0;
-	dev->checkpt_byte_count = 0;
-	dev->checkpt_sum = 0;
-	dev->checkpt_xor = 0;
-	dev->checkpt_cur_block = -1;
-	dev->checkpt_cur_chunk = -1;
-	dev->checkpt_next_block = dev->internal_start_block;
-
-	if (writing) {
-		memset(dev->checkpt_buffer, 0, dev->data_bytes_per_chunk);
-		yaffs2_checkpt_init_chunk_hdr(dev);
-		return yaffs_checkpt_erase(dev);
-	}
-
-	/* Opening for a read */
-	/* Set to a value that will kick off a read */
-	dev->checkpt_byte_offs = dev->data_bytes_per_chunk;
-	/* A checkpoint block list of 1 checkpoint block per 16 block is
-	 * (hopefully) going to be way more than we need */
-	dev->blocks_in_checkpt = 0;
-	dev->checkpt_max_blocks =
-	    (dev->internal_end_block - dev->internal_start_block) / 16 + 2;
-	if (!dev->checkpt_block_list)
-		dev->checkpt_block_list =
-		      kmalloc(sizeof(int) * dev->checkpt_max_blocks, GFP_NOFS);
-
-	if (!dev->checkpt_block_list)
-		return 0;
-
-	for (i = 0; i < dev->checkpt_max_blocks; i++)
-		dev->checkpt_block_list[i] = -1;
-
-	return 1;
-}
-
-int yaffs2_get_checkpt_sum(struct yaffs_dev *dev, u32 * sum)
-{
-	u32 composite_sum;
-
-	composite_sum = (dev->checkpt_sum << 8) | (dev->checkpt_xor & 0xff);
-	*sum = composite_sum;
-	return 1;
-}
-
-static int yaffs2_checkpt_flush_buffer(struct yaffs_dev *dev)
-{
-	int chunk;
-	int offset_chunk;
-	struct yaffs_ext_tags tags;
-
-	if (dev->checkpt_cur_block < 0) {
-		yaffs2_checkpt_find_erased_block(dev);
-		dev->checkpt_cur_chunk = 0;
-	}
-
-	if (dev->checkpt_cur_block < 0)
-		return 0;
-
-	tags.is_deleted = 0;
-	tags.obj_id = dev->checkpt_next_block;	/* Hint to next place to look */
-	tags.chunk_id = dev->checkpt_page_seq + 1;
-	tags.seq_number = YAFFS_SEQUENCE_CHECKPOINT_DATA;
-	tags.n_bytes = dev->data_bytes_per_chunk;
-	if (dev->checkpt_cur_chunk == 0) {
-		/* First chunk we write for the block? Set block state to
-		   checkpoint */
-		struct yaffs_block_info *bi =
-		    yaffs_get_block_info(dev, dev->checkpt_cur_block);
-		bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT;
-		dev->blocks_in_checkpt++;
-	}
-
-	chunk =
-	    dev->checkpt_cur_block * dev->param.chunks_per_block +
-	    dev->checkpt_cur_chunk;
-
-	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
-		"checkpoint wite buffer nand %d(%d:%d) objid %d chId %d",
-		chunk, dev->checkpt_cur_block, dev->checkpt_cur_chunk,
-		tags.obj_id, tags.chunk_id);
-
-	offset_chunk = apply_chunk_offset(dev, chunk);
-
-	dev->n_page_writes++;
-
-	dev->tagger.write_chunk_tags_fn(dev, offset_chunk,
-				       dev->checkpt_buffer, &tags);
-	dev->checkpt_page_seq++;
-	dev->checkpt_cur_chunk++;
-	if (dev->checkpt_cur_chunk >= dev->param.chunks_per_block) {
-		dev->checkpt_cur_chunk = 0;
-		dev->checkpt_cur_block = -1;
-	}
-	memset(dev->checkpt_buffer, 0, dev->data_bytes_per_chunk);
-
-	yaffs2_checkpt_init_chunk_hdr(dev);
-
-
-	return 1;
-}
-
-int yaffs2_checkpt_wr(struct yaffs_dev *dev, const void *data, int n_bytes)
-{
-	int i = 0;
-	int ok = 1;
-	u8 *data_bytes = (u8 *) data;
-
-	if (!dev->checkpt_buffer)
-		return 0;
-
-	if (!dev->checkpt_open_write)
-		return -1;
-
-	while (i < n_bytes && ok) {
-		dev->checkpt_buffer[dev->checkpt_byte_offs] = *data_bytes;
-		dev->checkpt_sum += *data_bytes;
-		dev->checkpt_xor ^= *data_bytes;
-
-		dev->checkpt_byte_offs++;
-		i++;
-		data_bytes++;
-		dev->checkpt_byte_count++;
-
-		if (dev->checkpt_byte_offs < 0 ||
-		    dev->checkpt_byte_offs >= dev->data_bytes_per_chunk)
-			ok = yaffs2_checkpt_flush_buffer(dev);
-	}
-
-	return i;
-}
-
-int yaffs2_checkpt_rd(struct yaffs_dev *dev, void *data, int n_bytes)
-{
-	int i = 0;
-	struct yaffs_ext_tags tags;
-	int chunk;
-	int offset_chunk;
-	u8 *data_bytes = (u8 *) data;
-
-	if (!dev->checkpt_buffer)
-		return 0;
-
-	if (dev->checkpt_open_write)
-		return -1;
-
-	while (i < n_bytes) {
-
-		if (dev->checkpt_byte_offs < 0 ||
-		    dev->checkpt_byte_offs >= dev->data_bytes_per_chunk) {
-
-			if (dev->checkpt_cur_block < 0) {
-				yaffs2_checkpt_find_block(dev);
-				dev->checkpt_cur_chunk = 0;
-			}
-
-			/* Bail out if we can't find a checpoint block */
-			if (dev->checkpt_cur_block < 0)
-				break;
-
-			chunk = dev->checkpt_cur_block *
-			    dev->param.chunks_per_block +
-			    dev->checkpt_cur_chunk;
-
-			offset_chunk = apply_chunk_offset(dev, chunk);
-			dev->n_page_reads++;
-
-			/* Read in the next chunk */
-			dev->tagger.read_chunk_tags_fn(dev,
-						offset_chunk,
-						dev->checkpt_buffer,
-						&tags);
-
-			/* Bail out if the chunk is corrupted. */
-			if (tags.chunk_id != (dev->checkpt_page_seq + 1) ||
-			    tags.ecc_result > YAFFS_ECC_RESULT_FIXED ||
-			    tags.seq_number != YAFFS_SEQUENCE_CHECKPOINT_DATA)
-				break;
-
-			/* Bail out if it is not a checkpoint chunk. */
-			if(!yaffs2_checkpt_check_chunk_hdr(dev))
-				break;
-
-			dev->checkpt_page_seq++;
-			dev->checkpt_cur_chunk++;
-
-			if (dev->checkpt_cur_chunk >=
-					dev->param.chunks_per_block)
-				dev->checkpt_cur_block = -1;
-
-		}
-
-		*data_bytes = dev->checkpt_buffer[dev->checkpt_byte_offs];
-		dev->checkpt_sum += *data_bytes;
-		dev->checkpt_xor ^= *data_bytes;
-		dev->checkpt_byte_offs++;
-		i++;
-		data_bytes++;
-		dev->checkpt_byte_count++;
-	}
-
-	return i; /* Number of bytes read */
-}
-
-int yaffs_checkpt_close(struct yaffs_dev *dev)
-{
-	int i;
-
-	if (dev->checkpt_open_write) {
-		if (dev->checkpt_byte_offs !=
-			sizeof(sizeof(struct yaffs_checkpt_chunk_hdr)))
-			yaffs2_checkpt_flush_buffer(dev);
-	} else if (dev->checkpt_block_list) {
-		for (i = 0;
-		     i < dev->blocks_in_checkpt &&
-		     dev->checkpt_block_list[i] >= 0; i++) {
-			int blk = dev->checkpt_block_list[i];
-			struct yaffs_block_info *bi = NULL;
-
-			if (dev->internal_start_block <= blk &&
-			    blk <= dev->internal_end_block)
-				bi = yaffs_get_block_info(dev, blk);
-			if (bi && bi->block_state == YAFFS_BLOCK_STATE_EMPTY)
-				bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT;
-		}
-	}
-
-	dev->n_free_chunks -=
-		dev->blocks_in_checkpt * dev->param.chunks_per_block;
-	dev->n_erased_blocks -= dev->blocks_in_checkpt;
-
-	yaffs_trace(YAFFS_TRACE_CHECKPOINT, "checkpoint byte count %d",
-		dev->checkpt_byte_count);
-
-	if (dev->checkpt_buffer)
-		return 1;
-	else
-		return 0;
-}
-
-int yaffs2_checkpt_invalidate_stream(struct yaffs_dev *dev)
-{
-	/* Erase the checkpoint data */
-
-	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
-		"checkpoint invalidate of %d blocks",
-		dev->blocks_in_checkpt);
-
-	return yaffs_checkpt_erase(dev);
-}

target/linux/generic/files/fs/yaffs2/yaffs_checkptrw.h

@@ -1,33 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License version 2.1 as
- * published by the Free Software Foundation.
- *
- * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
- */
-
-#ifndef __YAFFS_CHECKPTRW_H__
-#define __YAFFS_CHECKPTRW_H__
-
-#include "yaffs_guts.h"
-
-int yaffs2_checkpt_open(struct yaffs_dev *dev, int writing);
-
-int yaffs2_checkpt_wr(struct yaffs_dev *dev, const void *data, int n_bytes);
-
-int yaffs2_checkpt_rd(struct yaffs_dev *dev, void *data, int n_bytes);
-
-int yaffs2_get_checkpt_sum(struct yaffs_dev *dev, u32 * sum);
-
-int yaffs_checkpt_close(struct yaffs_dev *dev);
-
-int yaffs2_checkpt_invalidate_stream(struct yaffs_dev *dev);
-
-#endif

target/linux/generic/files/fs/yaffs2/yaffs_ecc.c

@@ -1,281 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-/*
- * This code implements the ECC algorithm used in SmartMedia.
- *
- * The ECC comprises 22 bits of parity information and is stuffed into 3 bytes.
- * The two unused bit are set to 1.
- * The ECC can correct single bit errors in a 256-byte page of data. Thus, two
- * such ECC blocks are used on a 512-byte NAND page.
- *
- */
-
-#include "yportenv.h"
-
-#include "yaffs_ecc.h"
-
-/* Table generated by gen-ecc.c
- * Using a table means we do not have to calculate p1..p4 and p1'..p4'
- * for each byte of data. These are instead provided in a table in bits7..2.
- * Bit 0 of each entry indicates whether the entry has an odd or even parity,
- * and therefore this bytes influence on the line parity.
- */
-
-static const unsigned char column_parity_table[] = {
-	0x00, 0x55, 0x59, 0x0c, 0x65, 0x30, 0x3c, 0x69,
-	0x69, 0x3c, 0x30, 0x65, 0x0c, 0x59, 0x55, 0x00,
-	0x95, 0xc0, 0xcc, 0x99, 0xf0, 0xa5, 0xa9, 0xfc,
-	0xfc, 0xa9, 0xa5, 0xf0, 0x99, 0xcc, 0xc0, 0x95,
-	0x99, 0xcc, 0xc0, 0x95, 0xfc, 0xa9, 0xa5, 0xf0,
-	0xf0, 0xa5, 0xa9, 0xfc, 0x95, 0xc0, 0xcc, 0x99,
-	0x0c, 0x59, 0x55, 0x00, 0x69, 0x3c, 0x30, 0x65,
-	0x65, 0x30, 0x3c, 0x69, 0x00, 0x55, 0x59, 0x0c,
-	0xa5, 0xf0, 0xfc, 0xa9, 0xc0, 0x95, 0x99, 0xcc,
-	0xcc, 0x99, 0x95, 0xc0, 0xa9, 0xfc, 0xf0, 0xa5,
-	0x30, 0x65, 0x69, 0x3c, 0x55, 0x00, 0x0c, 0x59,
-	0x59, 0x0c, 0x00, 0x55, 0x3c, 0x69, 0x65, 0x30,
-	0x3c, 0x69, 0x65, 0x30, 0x59, 0x0c, 0x00, 0x55,
-	0x55, 0x00, 0x0c, 0x59, 0x30, 0x65, 0x69, 0x3c,
-	0xa9, 0xfc, 0xf0, 0xa5, 0xcc, 0x99, 0x95, 0xc0,
-	0xc0, 0x95, 0x99, 0xcc, 0xa5, 0xf0, 0xfc, 0xa9,
-	0xa9, 0xfc, 0xf0, 0xa5, 0xcc, 0x99, 0x95, 0xc0,
-	0xc0, 0x95, 0x99, 0xcc, 0xa5, 0xf0, 0xfc, 0xa9,
-	0x3c, 0x69, 0x65, 0x30, 0x59, 0x0c, 0x00, 0x55,
-	0x55, 0x00, 0x0c, 0x59, 0x30, 0x65, 0x69, 0x3c,
-	0x30, 0x65, 0x69, 0x3c, 0x55, 0x00, 0x0c, 0x59,
-	0x59, 0x0c, 0x00, 0x55, 0x3c, 0x69, 0x65, 0x30,
-	0xa5, 0xf0, 0xfc, 0xa9, 0xc0, 0x95, 0x99, 0xcc,
-	0xcc, 0x99, 0x95, 0xc0, 0xa9, 0xfc, 0xf0, 0xa5,
-	0x0c, 0x59, 0x55, 0x00, 0x69, 0x3c, 0x30, 0x65,
-	0x65, 0x30, 0x3c, 0x69, 0x00, 0x55, 0x59, 0x0c,
-	0x99, 0xcc, 0xc0, 0x95, 0xfc, 0xa9, 0xa5, 0xf0,
-	0xf0, 0xa5, 0xa9, 0xfc, 0x95, 0xc0, 0xcc, 0x99,
-	0x95, 0xc0, 0xcc, 0x99, 0xf0, 0xa5, 0xa9, 0xfc,
-	0xfc, 0xa9, 0xa5, 0xf0, 0x99, 0xcc, 0xc0, 0x95,
-	0x00, 0x55, 0x59, 0x0c, 0x65, 0x30, 0x3c, 0x69,
-	0x69, 0x3c, 0x30, 0x65, 0x0c, 0x59, 0x55, 0x00,
-};
-
-
-/* Calculate the ECC for a 256-byte block of data */
-void yaffs_ecc_calc(const unsigned char *data, unsigned char *ecc)
-{
-	unsigned int i;
-	unsigned char col_parity = 0;
-	unsigned char line_parity = 0;
-	unsigned char line_parity_prime = 0;
-	unsigned char t;
-	unsigned char b;
-
-	for (i = 0; i < 256; i++) {
-		b = column_parity_table[*data++];
-		col_parity ^= b;
-
-		if (b & 0x01) {	/* odd number of bits in the byte */
-			line_parity ^= i;
-			line_parity_prime ^= ~i;
-		}
-	}
-
-	ecc[2] = (~col_parity) | 0x03;
-
-	t = 0;
-	if (line_parity & 0x80)
-		t |= 0x80;
-	if (line_parity_prime & 0x80)
-		t |= 0x40;
-	if (line_parity & 0x40)
-		t |= 0x20;
-	if (line_parity_prime & 0x40)
-		t |= 0x10;
-	if (line_parity & 0x20)
-		t |= 0x08;
-	if (line_parity_prime & 0x20)
-		t |= 0x04;
-	if (line_parity & 0x10)
-		t |= 0x02;
-	if (line_parity_prime & 0x10)
-		t |= 0x01;
-	ecc[1] = ~t;
-
-	t = 0;
-	if (line_parity & 0x08)
-		t |= 0x80;
-	if (line_parity_prime & 0x08)
-		t |= 0x40;
-	if (line_parity & 0x04)
-		t |= 0x20;
-	if (line_parity_prime & 0x04)
-		t |= 0x10;
-	if (line_parity & 0x02)
-		t |= 0x08;
-	if (line_parity_prime & 0x02)
-		t |= 0x04;
-	if (line_parity & 0x01)
-		t |= 0x02;
-	if (line_parity_prime & 0x01)
-		t |= 0x01;
-	ecc[0] = ~t;
-
-}
-
-/* Correct the ECC on a 256 byte block of data */
-
-int yaffs_ecc_correct(unsigned char *data, unsigned char *read_ecc,
-		      const unsigned char *test_ecc)
-{
-	unsigned char d0, d1, d2;	/* deltas */
-
-	d0 = read_ecc[0] ^ test_ecc[0];
-	d1 = read_ecc[1] ^ test_ecc[1];
-	d2 = read_ecc[2] ^ test_ecc[2];
-
-	if ((d0 | d1 | d2) == 0)
-		return 0;	/* no error */
-
-	if (((d0 ^ (d0 >> 1)) & 0x55) == 0x55 &&
-	    ((d1 ^ (d1 >> 1)) & 0x55) == 0x55 &&
-	    ((d2 ^ (d2 >> 1)) & 0x54) == 0x54) {
-		/* Single bit (recoverable) error in data */
-
-		unsigned byte;
-		unsigned bit;
-
-		bit = byte = 0;
-
-		if (d1 & 0x80)
-			byte |= 0x80;
-		if (d1 & 0x20)
-			byte |= 0x40;
-		if (d1 & 0x08)
-			byte |= 0x20;
-		if (d1 & 0x02)
-			byte |= 0x10;
-		if (d0 & 0x80)
-			byte |= 0x08;
-		if (d0 & 0x20)
-			byte |= 0x04;
-		if (d0 & 0x08)
-			byte |= 0x02;
-		if (d0 & 0x02)
-			byte |= 0x01;
-
-		if (d2 & 0x80)
-			bit |= 0x04;
-		if (d2 & 0x20)
-			bit |= 0x02;
-		if (d2 & 0x08)
-			bit |= 0x01;
-
-		data[byte] ^= (1 << bit);
-
-		return 1;	/* Corrected the error */
-	}
-
-	if ((hweight8(d0) + hweight8(d1) + hweight8(d2)) == 1) {
-		/* Reccoverable error in ecc */
-
-		read_ecc[0] = test_ecc[0];
-		read_ecc[1] = test_ecc[1];
-		read_ecc[2] = test_ecc[2];
-
-		return 1;	/* Corrected the error */
-	}
-
-	/* Unrecoverable error */
-
-	return -1;
-
-}
-
-/*
- * ECCxxxOther does ECC calcs on arbitrary n bytes of data
- */
-void yaffs_ecc_calc_other(const unsigned char *data, unsigned n_bytes,
-			  struct yaffs_ecc_other *ecc_other)
-{
-	unsigned int i;
-	unsigned char col_parity = 0;
-	unsigned line_parity = 0;
-	unsigned line_parity_prime = 0;
-	unsigned char b;
-
-	for (i = 0; i < n_bytes; i++) {
-		b = column_parity_table[*data++];
-		col_parity ^= b;
-
-		if (b & 0x01) {
-			/* odd number of bits in the byte */
-			line_parity ^= i;
-			line_parity_prime ^= ~i;
-		}
-
-	}
-
-	ecc_other->col_parity = (col_parity >> 2) & 0x3f;
-	ecc_other->line_parity = line_parity;
-	ecc_other->line_parity_prime = line_parity_prime;
-}
-
-int yaffs_ecc_correct_other(unsigned char *data, unsigned n_bytes,
-			    struct yaffs_ecc_other *read_ecc,
-			    const struct yaffs_ecc_other *test_ecc)
-{
-	unsigned char delta_col;	/* column parity delta */
-	unsigned delta_line;	/* line parity delta */
-	unsigned delta_line_prime;	/* line parity delta */
-	unsigned bit;
-
-	delta_col = read_ecc->col_parity ^ test_ecc->col_parity;
-	delta_line = read_ecc->line_parity ^ test_ecc->line_parity;
-	delta_line_prime =
-	    read_ecc->line_parity_prime ^ test_ecc->line_parity_prime;
-
-	if ((delta_col | delta_line | delta_line_prime) == 0)
-		return 0;	/* no error */
-
-	if (delta_line == ~delta_line_prime &&
-	    (((delta_col ^ (delta_col >> 1)) & 0x15) == 0x15)) {
-		/* Single bit (recoverable) error in data */
-
-		bit = 0;
-
-		if (delta_col & 0x20)
-			bit |= 0x04;
-		if (delta_col & 0x08)
-			bit |= 0x02;
-		if (delta_col & 0x02)
-			bit |= 0x01;
-
-		if (delta_line >= n_bytes)
-			return -1;
-
-		data[delta_line] ^= (1 << bit);
-
-		return 1;	/* corrected */
-	}
-
-	if ((hweight32(delta_line) +
-	     hweight32(delta_line_prime) +
-	     hweight8(delta_col)) == 1) {
-		/* Reccoverable error in ecc */
-
-		*read_ecc = *test_ecc;
-		return 1;	/* corrected */
-	}
-
-	/* Unrecoverable error */
-
-	return -1;
-}

target/linux/generic/files/fs/yaffs2/yaffs_ecc.h

@@ -1,44 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License version 2.1 as
- * published by the Free Software Foundation.
- *
- * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
- */
-
-/*
- * This code implements the ECC algorithm used in SmartMedia.
- *
- * The ECC comprises 22 bits of parity information and is stuffed into 3 bytes.
- * The two unused bit are set to 1.
- * The ECC can correct single bit errors in a 256-byte page of data.
- * Thus, two such ECC blocks are used on a 512-byte NAND page.
- *
- */
-
-#ifndef __YAFFS_ECC_H__
-#define __YAFFS_ECC_H__
-
-struct yaffs_ecc_other {
-	unsigned char col_parity;
-	unsigned line_parity;
-	unsigned line_parity_prime;
-};
-
-void yaffs_ecc_calc(const unsigned char *data, unsigned char *ecc);
-int yaffs_ecc_correct(unsigned char *data, unsigned char *read_ecc,
-		      const unsigned char *test_ecc);
-
-void yaffs_ecc_calc_other(const unsigned char *data, unsigned n_bytes,
-			  struct yaffs_ecc_other *ecc);
-int yaffs_ecc_correct_other(unsigned char *data, unsigned n_bytes,
-			    struct yaffs_ecc_other *read_ecc,
-			    const struct yaffs_ecc_other *test_ecc);
-#endif

target/linux/generic/files/fs/yaffs2/yaffs_getblockinfo.h

@@ -1,35 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License version 2.1 as
- * published by the Free Software Foundation.
- *
- * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
- */
-
-#ifndef __YAFFS_GETBLOCKINFO_H__
-#define __YAFFS_GETBLOCKINFO_H__
-
-#include "yaffs_guts.h"
-#include "yaffs_trace.h"
-
-/* Function to manipulate block info */
-static inline struct yaffs_block_info *yaffs_get_block_info(struct yaffs_dev
-							      *dev, int blk)
-{
-	if (blk < dev->internal_start_block || blk > dev->internal_end_block) {
-		yaffs_trace(YAFFS_TRACE_ERROR,
-			"**>> yaffs: get_block_info block %d is not valid",
-			blk);
-		BUG();
-	}
-	return &dev->block_info[blk - dev->internal_start_block];
-}
-
-#endif

target/linux/generic/files/fs/yaffs2/yaffs_guts.c

@@ -1,5140 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include "yportenv.h"
-#include "yaffs_trace.h"
-
-#include "yaffs_guts.h"
-#include "yaffs_getblockinfo.h"
-#include "yaffs_tagscompat.h"
-#include "yaffs_tagsmarshall.h"
-#include "yaffs_nand.h"
-#include "yaffs_yaffs1.h"
-#include "yaffs_yaffs2.h"
-#include "yaffs_bitmap.h"
-#include "yaffs_verify.h"
-#include "yaffs_nand.h"
-#include "yaffs_packedtags2.h"
-#include "yaffs_nameval.h"
-#include "yaffs_allocator.h"
-#include "yaffs_attribs.h"
-#include "yaffs_summary.h"
-
-/* Note YAFFS_GC_GOOD_ENOUGH must be <= YAFFS_GC_PASSIVE_THRESHOLD */
-#define YAFFS_GC_GOOD_ENOUGH 2
-#define YAFFS_GC_PASSIVE_THRESHOLD 4
-
-#include "yaffs_ecc.h"
-
-/* Forward declarations */
-
-static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
-			     const u8 *buffer, int n_bytes, int use_reserve);
-
-static void yaffs_fix_null_name(struct yaffs_obj *obj, YCHAR *name,
-				int buffer_size);
-
-/* Function to calculate chunk and offset */
-
-void yaffs_addr_to_chunk(struct yaffs_dev *dev, loff_t addr,
-				int *chunk_out, u32 *offset_out)
-{
-	int chunk;
-	u32 offset;
-
-	chunk = (u32) (addr >> dev->chunk_shift);
-
-	if (dev->chunk_div == 1) {
-		/* easy power of 2 case */
-		offset = (u32) (addr & dev->chunk_mask);
-	} else {
-		/* Non power-of-2 case */
-
-		loff_t chunk_base;
-
-		chunk /= dev->chunk_div;
-
-		chunk_base = ((loff_t) chunk) * dev->data_bytes_per_chunk;
-		offset = (u32) (addr - chunk_base);
-	}
-
-	*chunk_out = chunk;
-	*offset_out = offset;
-}
-
-/* Function to return the number of shifts for a power of 2 greater than or
- * equal to the given number
- * Note we don't try to cater for all possible numbers and this does not have to
- * be hellishly efficient.
- */
-
-static inline u32 calc_shifts_ceiling(u32 x)
-{
-	int extra_bits;
-	int shifts;
-
-	shifts = extra_bits = 0;
-
-	while (x > 1) {
-		if (x & 1)
-			extra_bits++;
-		x >>= 1;
-		shifts++;
-	}
-
-	if (extra_bits)
-		shifts++;
-
-	return shifts;
-}
-
-/* Function to return the number of shifts to get a 1 in bit 0
- */
-
-static inline u32 calc_shifts(u32 x)
-{
-	u32 shifts;
-
-	shifts = 0;
-
-	if (!x)
-		return 0;
-
-	while (!(x & 1)) {
-		x >>= 1;
-		shifts++;
-	}
-
-	return shifts;
-}
-
-/*
- * Temporary buffer manipulations.
- */
-
-static int yaffs_init_tmp_buffers(struct yaffs_dev *dev)
-{
-	int i;
-	u8 *buf = (u8 *) 1;
-
-	memset(dev->temp_buffer, 0, sizeof(dev->temp_buffer));
-
-	for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
-		dev->temp_buffer[i].in_use = 0;
-		buf = kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
-		dev->temp_buffer[i].buffer = buf;
-	}
-
-	return buf ? YAFFS_OK : YAFFS_FAIL;
-}
-
-u8 *yaffs_get_temp_buffer(struct yaffs_dev * dev)
-{
-	int i;
-
-	dev->temp_in_use++;
-	if (dev->temp_in_use > dev->max_temp)
-		dev->max_temp = dev->temp_in_use;
-
-	for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
-		if (dev->temp_buffer[i].in_use == 0) {
-			dev->temp_buffer[i].in_use = 1;
-			return dev->temp_buffer[i].buffer;
-		}
-	}
-
-	yaffs_trace(YAFFS_TRACE_BUFFERS, "Out of temp buffers");
-	/*
-	 * If we got here then we have to allocate an unmanaged one
-	 * This is not good.
-	 */
-
-	dev->unmanaged_buffer_allocs++;
-	return kmalloc(dev->data_bytes_per_chunk, GFP_NOFS);
-
-}
-
-void yaffs_release_temp_buffer(struct yaffs_dev *dev, u8 *buffer)
-{
-	int i;
-
-	dev->temp_in_use--;
-
-	for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
-		if (dev->temp_buffer[i].buffer == buffer) {
-			dev->temp_buffer[i].in_use = 0;
-			return;
-		}
-	}
-
-	if (buffer) {
-		/* assume it is an unmanaged one. */
-		yaffs_trace(YAFFS_TRACE_BUFFERS,
-			"Releasing unmanaged temp buffer");
-		kfree(buffer);
-		dev->unmanaged_buffer_deallocs++;
-	}
-
-}
-
-/*
- * Functions for robustisizing TODO
- *
- */
-
-static void yaffs_handle_chunk_wr_ok(struct yaffs_dev *dev, int nand_chunk,
-				     const u8 *data,
-				     const struct yaffs_ext_tags *tags)
-{
-	(void) dev;
-	(void) nand_chunk;
-	(void) data;
-	(void) tags;
-}
-
-static void yaffs_handle_chunk_update(struct yaffs_dev *dev, int nand_chunk,
-				      const struct yaffs_ext_tags *tags)
-{
-	(void) dev;
-	(void) nand_chunk;
-	(void) tags;
-}
-
-void yaffs_handle_chunk_error(struct yaffs_dev *dev,
-			      struct yaffs_block_info *bi)
-{
-	if (!bi->gc_prioritise) {
-		bi->gc_prioritise = 1;
-		dev->has_pending_prioritised_gc = 1;
-		bi->chunk_error_strikes++;
-
-		if (bi->chunk_error_strikes > 3) {
-			bi->needs_retiring = 1;	/* Too many stikes, so retire */
-			yaffs_trace(YAFFS_TRACE_ALWAYS,
-				"yaffs: Block struck out");
-
-		}
-	}
-}
-
-static void yaffs_handle_chunk_wr_error(struct yaffs_dev *dev, int nand_chunk,
-					int erased_ok)
-{
-	int flash_block = nand_chunk / dev->param.chunks_per_block;
-	struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
-
-	yaffs_handle_chunk_error(dev, bi);
-
-	if (erased_ok) {
-		/* Was an actual write failure,
-		 * so mark the block for retirement.*/
-		bi->needs_retiring = 1;
-		yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
-		  "**>> Block %d needs retiring", flash_block);
-	}
-
-	/* Delete the chunk */
-	yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
-	yaffs_skip_rest_of_block(dev);
-}
-
-/*
- * Verification code
- */
-
-/*
- *  Simple hash function. Needs to have a reasonable spread
- */
-
-static inline int yaffs_hash_fn(int n)
-{
-	if (n < 0)
-		n = -n;
-	return n % YAFFS_NOBJECT_BUCKETS;
-}
-
-/*
- * Access functions to useful fake objects.
- * Note that root might have a presence in NAND if permissions are set.
- */
-
-struct yaffs_obj *yaffs_root(struct yaffs_dev *dev)
-{
-	return dev->root_dir;
-}
-
-struct yaffs_obj *yaffs_lost_n_found(struct yaffs_dev *dev)
-{
-	return dev->lost_n_found;
-}
-
-/*
- *  Erased NAND checking functions
- */
-
-int yaffs_check_ff(u8 *buffer, int n_bytes)
-{
-	/* Horrible, slow implementation */
-	while (n_bytes--) {
-		if (*buffer != 0xff)
-			return 0;
-		buffer++;
-	}
-	return 1;
-}
-
-static int yaffs_check_chunk_erased(struct yaffs_dev *dev, int nand_chunk)
-{
-	int retval = YAFFS_OK;
-	u8 *data = yaffs_get_temp_buffer(dev);
-	struct yaffs_ext_tags tags;
-	int result;
-
-	result = yaffs_rd_chunk_tags_nand(dev, nand_chunk, data, &tags);
-
-	if (tags.ecc_result > YAFFS_ECC_RESULT_NO_ERROR)
-		retval = YAFFS_FAIL;
-
-	if (!yaffs_check_ff(data, dev->data_bytes_per_chunk) ||
-		tags.chunk_used) {
-		yaffs_trace(YAFFS_TRACE_NANDACCESS,
-			"Chunk %d not erased", nand_chunk);
-		retval = YAFFS_FAIL;
-	}
-
-	yaffs_release_temp_buffer(dev, data);
-
-	return retval;
-
-}
-
-static int yaffs_verify_chunk_written(struct yaffs_dev *dev,
-				      int nand_chunk,
-				      const u8 *data,
-				      struct yaffs_ext_tags *tags)
-{
-	int retval = YAFFS_OK;
-	struct yaffs_ext_tags temp_tags;
-	u8 *buffer = yaffs_get_temp_buffer(dev);
-	int result;
-
-	result = yaffs_rd_chunk_tags_nand(dev, nand_chunk, buffer, &temp_tags);
-	if (memcmp(buffer, data, dev->data_bytes_per_chunk) ||
-	    temp_tags.obj_id != tags->obj_id ||
-	    temp_tags.chunk_id != tags->chunk_id ||
-	    temp_tags.n_bytes != tags->n_bytes)
-		retval = YAFFS_FAIL;
-
-	yaffs_release_temp_buffer(dev, buffer);
-
-	return retval;
-}
-
-
-int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks)
-{
-	int reserved_chunks;
-	int reserved_blocks = dev->param.n_reserved_blocks;
-	int checkpt_blocks;
-
-	checkpt_blocks = yaffs_calc_checkpt_blocks_required(dev);
-
-	reserved_chunks =
-	    (reserved_blocks + checkpt_blocks) * dev->param.chunks_per_block;
-
-	return (dev->n_free_chunks > (reserved_chunks + n_chunks));
-}
-
-static int yaffs_find_alloc_block(struct yaffs_dev *dev)
-{
-	int i;
-	struct yaffs_block_info *bi;
-
-	if (dev->n_erased_blocks < 1) {
-		/* Hoosterman we've got a problem.
-		 * Can't get space to gc
-		 */
-		yaffs_trace(YAFFS_TRACE_ERROR,
-		  "yaffs tragedy: no more erased blocks");
-
-		return -1;
-	}
-
-	/* Find an empty block. */
-
-	for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
-		dev->alloc_block_finder++;
-		if (dev->alloc_block_finder < dev->internal_start_block
-		    || dev->alloc_block_finder > dev->internal_end_block) {
-			dev->alloc_block_finder = dev->internal_start_block;
-		}
-
-		bi = yaffs_get_block_info(dev, dev->alloc_block_finder);
-
-		if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
-			bi->block_state = YAFFS_BLOCK_STATE_ALLOCATING;
-			dev->seq_number++;
-			bi->seq_number = dev->seq_number;
-			dev->n_erased_blocks--;
-			yaffs_trace(YAFFS_TRACE_ALLOCATE,
-			  "Allocated block %d, seq  %d, %d left" ,
-			   dev->alloc_block_finder, dev->seq_number,
-			   dev->n_erased_blocks);
-			return dev->alloc_block_finder;
-		}
-	}
-
-	yaffs_trace(YAFFS_TRACE_ALWAYS,
-		"yaffs tragedy: no more erased blocks, but there should have been %d",
-		dev->n_erased_blocks);
-
-	return -1;
-}
-
-static int yaffs_alloc_chunk(struct yaffs_dev *dev, int use_reserver,
-			     struct yaffs_block_info **block_ptr)
-{
-	int ret_val;
-	struct yaffs_block_info *bi;
-
-	if (dev->alloc_block < 0) {
-		/* Get next block to allocate off */
-		dev->alloc_block = yaffs_find_alloc_block(dev);
-		dev->alloc_page = 0;
-	}
-
-	if (!use_reserver && !yaffs_check_alloc_available(dev, 1)) {
-		/* No space unless we're allowed to use the reserve. */
-		return -1;
-	}
-
-	if (dev->n_erased_blocks < dev->param.n_reserved_blocks
-	    && dev->alloc_page == 0)
-		yaffs_trace(YAFFS_TRACE_ALLOCATE, "Allocating reserve");
-
-	/* Next page please.... */
-	if (dev->alloc_block >= 0) {
-		bi = yaffs_get_block_info(dev, dev->alloc_block);
-
-		ret_val = (dev->alloc_block * dev->param.chunks_per_block) +
-		    dev->alloc_page;
-		bi->pages_in_use++;
-		yaffs_set_chunk_bit(dev, dev->alloc_block, dev->alloc_page);
-
-		dev->alloc_page++;
-
-		dev->n_free_chunks--;
-
-		/* If the block is full set the state to full */
-		if (dev->alloc_page >= dev->param.chunks_per_block) {
-			bi->block_state = YAFFS_BLOCK_STATE_FULL;
-			dev->alloc_block = -1;
-		}
-
-		if (block_ptr)
-			*block_ptr = bi;
-
-		return ret_val;
-	}
-
-	yaffs_trace(YAFFS_TRACE_ERROR,
-		"!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!");
-
-	return -1;
-}
-
-static int yaffs_get_erased_chunks(struct yaffs_dev *dev)
-{
-	int n;
-
-	n = dev->n_erased_blocks * dev->param.chunks_per_block;
-
-	if (dev->alloc_block > 0)
-		n += (dev->param.chunks_per_block - dev->alloc_page);
-
-	return n;
-
-}
-
-/*
- * yaffs_skip_rest_of_block() skips over the rest of the allocation block
- * if we don't want to write to it.
- */
-void yaffs_skip_rest_of_block(struct yaffs_dev *dev)
-{
-	struct yaffs_block_info *bi;
-
-	if (dev->alloc_block > 0) {
-		bi = yaffs_get_block_info(dev, dev->alloc_block);
-		if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING) {
-			bi->block_state = YAFFS_BLOCK_STATE_FULL;
-			dev->alloc_block = -1;
-		}
-	}
-}
-
-static int yaffs_write_new_chunk(struct yaffs_dev *dev,
-				 const u8 *data,
-				 struct yaffs_ext_tags *tags, int use_reserver)
-{
-	int attempts = 0;
-	int write_ok = 0;
-	int chunk;
-
-	yaffs2_checkpt_invalidate(dev);
-
-	do {
-		struct yaffs_block_info *bi = 0;
-		int erased_ok = 0;
-
-		chunk = yaffs_alloc_chunk(dev, use_reserver, &bi);
-		if (chunk < 0) {
-			/* no space */
-			break;
-		}
-
-		/* First check this chunk is erased, if it needs
-		 * checking.  The checking policy (unless forced
-		 * always on) is as follows:
-		 *
-		 * Check the first page we try to write in a block.
-		 * If the check passes then we don't need to check any
-		 * more.        If the check fails, we check again...
-		 * If the block has been erased, we don't need to check.
-		 *
-		 * However, if the block has been prioritised for gc,
-		 * then we think there might be something odd about
-		 * this block and stop using it.
-		 *
-		 * Rationale: We should only ever see chunks that have
-		 * not been erased if there was a partially written
-		 * chunk due to power loss.  This checking policy should
-		 * catch that case with very few checks and thus save a
-		 * lot of checks that are most likely not needed.
-		 *
-		 * Mods to the above
-		 * If an erase check fails or the write fails we skip the
-		 * rest of the block.
-		 */
-
-		/* let's give it a try */
-		attempts++;
-
-		if (dev->param.always_check_erased)
-			bi->skip_erased_check = 0;
-
-		if (!bi->skip_erased_check) {
-			erased_ok = yaffs_check_chunk_erased(dev, chunk);
-			if (erased_ok != YAFFS_OK) {
-				yaffs_trace(YAFFS_TRACE_ERROR,
-				  "**>> yaffs chunk %d was not erased",
-				  chunk);
-
-				/* If not erased, delete this one,
-				 * skip rest of block and
-				 * try another chunk */
-				yaffs_chunk_del(dev, chunk, 1, __LINE__);
-				yaffs_skip_rest_of_block(dev);
-				continue;
-			}
-		}
-
-		write_ok = yaffs_wr_chunk_tags_nand(dev, chunk, data, tags);
-
-		if (!bi->skip_erased_check)
-			write_ok =
-			    yaffs_verify_chunk_written(dev, chunk, data, tags);
-
-		if (write_ok != YAFFS_OK) {
-			/* Clean up aborted write, skip to next block and
-			 * try another chunk */
-			yaffs_handle_chunk_wr_error(dev, chunk, erased_ok);
-			continue;
-		}
-
-		bi->skip_erased_check = 1;
-
-		/* Copy the data into the robustification buffer */
-		yaffs_handle_chunk_wr_ok(dev, chunk, data, tags);
-
-	} while (write_ok != YAFFS_OK &&
-		 (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
-
-	if (!write_ok)
-		chunk = -1;
-
-	if (attempts > 1) {
-		yaffs_trace(YAFFS_TRACE_ERROR,
-			"**>> yaffs write required %d attempts",
-			attempts);
-		dev->n_retried_writes += (attempts - 1);
-	}
-
-	return chunk;
-}
-
-/*
- * Block retiring for handling a broken block.
- */
-
-static void yaffs_retire_block(struct yaffs_dev *dev, int flash_block)
-{
-	struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
-
-	yaffs2_checkpt_invalidate(dev);
-
-	yaffs2_clear_oldest_dirty_seq(dev, bi);
-
-	if (yaffs_mark_bad(dev, flash_block) != YAFFS_OK) {
-		if (yaffs_erase_block(dev, flash_block) != YAFFS_OK) {
-			yaffs_trace(YAFFS_TRACE_ALWAYS,
-				"yaffs: Failed to mark bad and erase block %d",
-				flash_block);
-		} else {
-			struct yaffs_ext_tags tags;
-			int chunk_id =
-			    flash_block * dev->param.chunks_per_block;
-
-			u8 *buffer = yaffs_get_temp_buffer(dev);
-
-			memset(buffer, 0xff, dev->data_bytes_per_chunk);
-			memset(&tags, 0, sizeof(tags));
-			tags.seq_number = YAFFS_SEQUENCE_BAD_BLOCK;
-			if (dev->tagger.write_chunk_tags_fn(dev, chunk_id -
-							dev->chunk_offset,
-							buffer,
-							&tags) != YAFFS_OK)
-				yaffs_trace(YAFFS_TRACE_ALWAYS,
-					"yaffs: Failed to write bad block marker to block %d",
-					flash_block);
-
-			yaffs_release_temp_buffer(dev, buffer);
-		}
-	}
-
-	bi->block_state = YAFFS_BLOCK_STATE_DEAD;
-	bi->gc_prioritise = 0;
-	bi->needs_retiring = 0;
-
-	dev->n_retired_blocks++;
-}
-
-/*---------------- Name handling functions ------------*/
-
-static void yaffs_load_name_from_oh(struct yaffs_dev *dev, YCHAR *name,
-				    const YCHAR *oh_name, int buff_size)
-{
-#ifdef CONFIG_YAFFS_AUTO_UNICODE
-	if (dev->param.auto_unicode) {
-		if (*oh_name) {
-			/* It is an ASCII name, do an ASCII to
-			 * unicode conversion */
-			const char *ascii_oh_name = (const char *)oh_name;
-			int n = buff_size - 1;
-			while (n > 0 && *ascii_oh_name) {
-				*name = *ascii_oh_name;
-				name++;
-				ascii_oh_name++;
-				n--;
-			}
-		} else {
-			strncpy(name, oh_name + 1, buff_size - 1);
-		}
-	} else {
-#else
-	(void) dev;
-	{
-#endif
-		strncpy(name, oh_name, buff_size - 1);
-	}
-}
-
-static void yaffs_load_oh_from_name(struct yaffs_dev *dev, YCHAR *oh_name,
-				    const YCHAR *name)
-{
-#ifdef CONFIG_YAFFS_AUTO_UNICODE
-
-	int is_ascii;
-	const YCHAR *w;
-
-	if (dev->param.auto_unicode) {
-
-		is_ascii = 1;
-		w = name;
-
-		/* Figure out if the name will fit in ascii character set */
-		while (is_ascii && *w) {
-			if ((*w) & 0xff00)
-				is_ascii = 0;
-			w++;
-		}
-
-		if (is_ascii) {
-			/* It is an ASCII name, so convert unicode to ascii */
-			char *ascii_oh_name = (char *)oh_name;
-			int n = YAFFS_MAX_NAME_LENGTH - 1;
-			while (n > 0 && *name) {
-				*ascii_oh_name = *name;
-				name++;
-				ascii_oh_name++;
-				n--;
-			}
-		} else {
-			/* Unicode name, so save starting at the second YCHAR */
-			*oh_name = 0;
-			strncpy(oh_name + 1, name, YAFFS_MAX_NAME_LENGTH - 2);
-		}
-	} else {
-#else
-	dev = dev;
-	{
-#endif
-		strncpy(oh_name, name, YAFFS_MAX_NAME_LENGTH - 1);
-	}
-}
-
-static u16 yaffs_calc_name_sum(const YCHAR *name)
-{
-	u16 sum = 0;
-	u16 i = 1;
-
-	if (!name)
-		return 0;
-
-	while ((*name) && i < (YAFFS_MAX_NAME_LENGTH / 2)) {
-
-		/* 0x1f mask is case insensitive */
-		sum += ((*name) & 0x1f) * i;
-		i++;
-		name++;
-	}
-	return sum;
-}
-
-
-void yaffs_set_obj_name(struct yaffs_obj *obj, const YCHAR * name)
-{
-	memset(obj->short_name, 0, sizeof(obj->short_name));
-
-	if (name && !name[0]) {
-		yaffs_fix_null_name(obj, obj->short_name,
-				YAFFS_SHORT_NAME_LENGTH);
-		name = obj->short_name;
-	} else if (name &&
-		strnlen(name, YAFFS_SHORT_NAME_LENGTH + 1) <=
-		YAFFS_SHORT_NAME_LENGTH)  {
-		strcpy(obj->short_name, name);
-	}
-
-	obj->sum = yaffs_calc_name_sum(name);
-}
-
-void yaffs_set_obj_name_from_oh(struct yaffs_obj *obj,
-				const struct yaffs_obj_hdr *oh)
-{
-#ifdef CONFIG_YAFFS_AUTO_UNICODE
-	YCHAR tmp_name[YAFFS_MAX_NAME_LENGTH + 1];
-	memset(tmp_name, 0, sizeof(tmp_name));
-	yaffs_load_name_from_oh(obj->my_dev, tmp_name, oh->name,
-				YAFFS_MAX_NAME_LENGTH + 1);
-	yaffs_set_obj_name(obj, tmp_name);
-#else
-	yaffs_set_obj_name(obj, oh->name);
-#endif
-}
-
-loff_t yaffs_max_file_size(struct yaffs_dev *dev)
-{
-	if(sizeof(loff_t) < 8)
-		return YAFFS_MAX_FILE_SIZE_32;
-	else
-		return ((loff_t) YAFFS_MAX_CHUNK_ID) * dev->data_bytes_per_chunk;
-}
-
-/*-------------------- TNODES -------------------
-
- * List of spare tnodes
- * The list is hooked together using the first pointer
- * in the tnode.
- */
-
-struct yaffs_tnode *yaffs_get_tnode(struct yaffs_dev *dev)
-{
-	struct yaffs_tnode *tn = yaffs_alloc_raw_tnode(dev);
-
-	if (tn) {
-		memset(tn, 0, dev->tnode_size);
-		dev->n_tnodes++;
-	}
-
-	dev->checkpoint_blocks_required = 0;	/* force recalculation */
-
-	return tn;
-}
-
-/* FreeTnode frees up a tnode and puts it back on the free list */
-static void yaffs_free_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
-{
-	yaffs_free_raw_tnode(dev, tn);
-	dev->n_tnodes--;
-	dev->checkpoint_blocks_required = 0;	/* force recalculation */
-}
-
-static void yaffs_deinit_tnodes_and_objs(struct yaffs_dev *dev)
-{
-	yaffs_deinit_raw_tnodes_and_objs(dev);
-	dev->n_obj = 0;
-	dev->n_tnodes = 0;
-}
-
-static void yaffs_load_tnode_0(struct yaffs_dev *dev, struct yaffs_tnode *tn,
-			unsigned pos, unsigned val)
-{
-	u32 *map = (u32 *) tn;
-	u32 bit_in_map;
-	u32 bit_in_word;
-	u32 word_in_map;
-	u32 mask;
-
-	pos &= YAFFS_TNODES_LEVEL0_MASK;
-	val >>= dev->chunk_grp_bits;
-
-	bit_in_map = pos * dev->tnode_width;
-	word_in_map = bit_in_map / 32;
-	bit_in_word = bit_in_map & (32 - 1);
-
-	mask = dev->tnode_mask << bit_in_word;
-
-	map[word_in_map] &= ~mask;
-	map[word_in_map] |= (mask & (val << bit_in_word));
-
-	if (dev->tnode_width > (32 - bit_in_word)) {
-		bit_in_word = (32 - bit_in_word);
-		word_in_map++;
-		mask =
-		    dev->tnode_mask >> bit_in_word;
-		map[word_in_map] &= ~mask;
-		map[word_in_map] |= (mask & (val >> bit_in_word));
-	}
-}
-
-u32 yaffs_get_group_base(struct yaffs_dev *dev, struct yaffs_tnode *tn,
-			 unsigned pos)
-{
-	u32 *map = (u32 *) tn;
-	u32 bit_in_map;
-	u32 bit_in_word;
-	u32 word_in_map;
-	u32 val;
-
-	pos &= YAFFS_TNODES_LEVEL0_MASK;
-
-	bit_in_map = pos * dev->tnode_width;
-	word_in_map = bit_in_map / 32;
-	bit_in_word = bit_in_map & (32 - 1);
-
-	val = map[word_in_map] >> bit_in_word;
-
-	if (dev->tnode_width > (32 - bit_in_word)) {
-		bit_in_word = (32 - bit_in_word);
-		word_in_map++;
-		val |= (map[word_in_map] << bit_in_word);
-	}
-
-	val &= dev->tnode_mask;
-	val <<= dev->chunk_grp_bits;
-
-	return val;
-}
-
-/* ------------------- End of individual tnode manipulation -----------------*/
-
-/* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
- * The look up tree is represented by the top tnode and the number of top_level
- * in the tree. 0 means only the level 0 tnode is in the tree.
- */
-
-/* FindLevel0Tnode finds the level 0 tnode, if one exists. */
-struct yaffs_tnode *yaffs_find_tnode_0(struct yaffs_dev *dev,
-				       struct yaffs_file_var *file_struct,
-				       u32 chunk_id)
-{
-	struct yaffs_tnode *tn = file_struct->top;
-	u32 i;
-	int required_depth;
-	int level = file_struct->top_level;
-
-	(void) dev;
-
-	/* Check sane level and chunk Id */
-	if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
-		return NULL;
-
-	if (chunk_id > YAFFS_MAX_CHUNK_ID)
-		return NULL;
-
-	/* First check we're tall enough (ie enough top_level) */
-
-	i = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
-	required_depth = 0;
-	while (i) {
-		i >>= YAFFS_TNODES_INTERNAL_BITS;
-		required_depth++;
-	}
-
-	if (required_depth > file_struct->top_level)
-		return NULL;	/* Not tall enough, so we can't find it */
-
-	/* Traverse down to level 0 */
-	while (level > 0 && tn) {
-		tn = tn->internal[(chunk_id >>
-				   (YAFFS_TNODES_LEVEL0_BITS +
-				    (level - 1) *
-				    YAFFS_TNODES_INTERNAL_BITS)) &
-				  YAFFS_TNODES_INTERNAL_MASK];
-		level--;
-	}
-
-	return tn;
-}
-
-/* add_find_tnode_0 finds the level 0 tnode if it exists,
- * otherwise first expands the tree.
- * This happens in two steps:
- *  1. If the tree isn't tall enough, then make it taller.
- *  2. Scan down the tree towards the level 0 tnode adding tnodes if required.
- *
- * Used when modifying the tree.
- *
- *  If the tn argument is NULL, then a fresh tnode will be added otherwise the
- *  specified tn will be plugged into the ttree.
- */
-
-struct yaffs_tnode *yaffs_add_find_tnode_0(struct yaffs_dev *dev,
-					   struct yaffs_file_var *file_struct,
-					   u32 chunk_id,
-					   struct yaffs_tnode *passed_tn)
-{
-	int required_depth;
-	int i;
-	int l;
-	struct yaffs_tnode *tn;
-	u32 x;
-
-	/* Check sane level and page Id */
-	if (file_struct->top_level < 0 ||
-	    file_struct->top_level > YAFFS_TNODES_MAX_LEVEL)
-		return NULL;
-
-	if (chunk_id > YAFFS_MAX_CHUNK_ID)
-		return NULL;
-
-	/* First check we're tall enough (ie enough top_level) */
-
-	x = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
-	required_depth = 0;
-	while (x) {
-		x >>= YAFFS_TNODES_INTERNAL_BITS;
-		required_depth++;
-	}
-
-	if (required_depth > file_struct->top_level) {
-		/* Not tall enough, gotta make the tree taller */
-		for (i = file_struct->top_level; i < required_depth; i++) {
-
-			tn = yaffs_get_tnode(dev);
-
-			if (tn) {
-				tn->internal[0] = file_struct->top;
-				file_struct->top = tn;
-				file_struct->top_level++;
-			} else {
-				yaffs_trace(YAFFS_TRACE_ERROR,
-					"yaffs: no more tnodes");
-				return NULL;
-			}
-		}
-	}
-
-	/* Traverse down to level 0, adding anything we need */
-
-	l = file_struct->top_level;
-	tn = file_struct->top;
-
-	if (l > 0) {
-		while (l > 0 && tn) {
-			x = (chunk_id >>
-			     (YAFFS_TNODES_LEVEL0_BITS +
-			      (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
-			    YAFFS_TNODES_INTERNAL_MASK;
-
-			if ((l > 1) && !tn->internal[x]) {
-				/* Add missing non-level-zero tnode */
-				tn->internal[x] = yaffs_get_tnode(dev);
-				if (!tn->internal[x])
-					return NULL;
-			} else if (l == 1) {
-				/* Looking from level 1 at level 0 */
-				if (passed_tn) {
-					/* If we already have one, release it */
-					if (tn->internal[x])
-						yaffs_free_tnode(dev,
-							tn->internal[x]);
-					tn->internal[x] = passed_tn;
-
-				} else if (!tn->internal[x]) {
-					/* Don't have one, none passed in */
-					tn->internal[x] = yaffs_get_tnode(dev);
-					if (!tn->internal[x])
-						return NULL;
-				}
-			}
-
-			tn = tn->internal[x];
-			l--;
-		}
-	} else {
-		/* top is level 0 */
-		if (passed_tn) {
-			memcpy(tn, passed_tn,
-			       (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8);
-			yaffs_free_tnode(dev, passed_tn);
-		}
-	}
-
-	return tn;
-}
-
-static int yaffs_tags_match(const struct yaffs_ext_tags *tags, int obj_id,
-			    int chunk_obj)
-{
-	return (tags->chunk_id == chunk_obj &&
-		tags->obj_id == obj_id &&
-		!tags->is_deleted) ? 1 : 0;
-
-}
-
-static int yaffs_find_chunk_in_group(struct yaffs_dev *dev, int the_chunk,
-					struct yaffs_ext_tags *tags, int obj_id,
-					int inode_chunk)
-{
-	int j;
-
-	for (j = 0; the_chunk && j < dev->chunk_grp_size; j++) {
-		if (yaffs_check_chunk_bit
-		    (dev, the_chunk / dev->param.chunks_per_block,
-		     the_chunk % dev->param.chunks_per_block)) {
-
-			if (dev->chunk_grp_size == 1)
-				return the_chunk;
-			else {
-				yaffs_rd_chunk_tags_nand(dev, the_chunk, NULL,
-							 tags);
-				if (yaffs_tags_match(tags,
-							obj_id, inode_chunk)) {
-					/* found it; */
-					return the_chunk;
-				}
-			}
-		}
-		the_chunk++;
-	}
-	return -1;
-}
-
-int yaffs_find_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
-				    struct yaffs_ext_tags *tags)
-{
-	/*Get the Tnode, then get the level 0 offset chunk offset */
-	struct yaffs_tnode *tn;
-	int the_chunk = -1;
-	struct yaffs_ext_tags local_tags;
-	int ret_val = -1;
-	struct yaffs_dev *dev = in->my_dev;
-
-	if (!tags) {
-		/* Passed a NULL, so use our own tags space */
-		tags = &local_tags;
-	}
-
-	tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
-
-	if (!tn)
-		return ret_val;
-
-	the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
-
-	ret_val = yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
-					      inode_chunk);
-	return ret_val;
-}
-
-static int yaffs_find_del_file_chunk(struct yaffs_obj *in, int inode_chunk,
-				     struct yaffs_ext_tags *tags)
-{
-	/* Get the Tnode, then get the level 0 offset chunk offset */
-	struct yaffs_tnode *tn;
-	int the_chunk = -1;
-	struct yaffs_ext_tags local_tags;
-	struct yaffs_dev *dev = in->my_dev;
-	int ret_val = -1;
-
-	if (!tags) {
-		/* Passed a NULL, so use our own tags space */
-		tags = &local_tags;
-	}
-
-	tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
-
-	if (!tn)
-		return ret_val;
-
-	the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
-
-	ret_val = yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
-					      inode_chunk);
-
-	/* Delete the entry in the filestructure (if found) */
-	if (ret_val != -1)
-		yaffs_load_tnode_0(dev, tn, inode_chunk, 0);
-
-	return ret_val;
-}
-
-int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
-			    int nand_chunk, int in_scan)
-{
-	/* NB in_scan is zero unless scanning.
-	 * For forward scanning, in_scan is > 0;
-	 * for backward scanning in_scan is < 0
-	 *
-	 * nand_chunk = 0 is a dummy insert to make sure the tnodes are there.
-	 */
-
-	struct yaffs_tnode *tn;
-	struct yaffs_dev *dev = in->my_dev;
-	int existing_cunk;
-	struct yaffs_ext_tags existing_tags;
-	struct yaffs_ext_tags new_tags;
-	unsigned existing_serial, new_serial;
-
-	if (in->variant_type != YAFFS_OBJECT_TYPE_FILE) {
-		/* Just ignore an attempt at putting a chunk into a non-file
-		 * during scanning.
-		 * If it is not during Scanning then something went wrong!
-		 */
-		if (!in_scan) {
-			yaffs_trace(YAFFS_TRACE_ERROR,
-				"yaffs tragedy:attempt to put data chunk into a non-file"
-				);
-			BUG();
-		}
-
-		yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
-		return YAFFS_OK;
-	}
-
-	tn = yaffs_add_find_tnode_0(dev,
-				    &in->variant.file_variant,
-				    inode_chunk, NULL);
-	if (!tn)
-		return YAFFS_FAIL;
-
-	if (!nand_chunk)
-		/* Dummy insert, bail now */
-		return YAFFS_OK;
-
-	existing_cunk = yaffs_get_group_base(dev, tn, inode_chunk);
-
-	if (in_scan != 0) {
-		/* If we're scanning then we need to test for duplicates
-		 * NB This does not need to be efficient since it should only
-		 * happen when the power fails during a write, then only one
-		 * chunk should ever be affected.
-		 *
-		 * Correction for YAFFS2: This could happen quite a lot and we
-		 * need to think about efficiency! TODO
-		 * Update: For backward scanning we don't need to re-read tags
-		 * so this is quite cheap.
-		 */
-
-		if (existing_cunk > 0) {
-			/* NB Right now existing chunk will not be real
-			 * chunk_id if the chunk group size > 1
-			 * thus we have to do a FindChunkInFile to get the
-			 * real chunk id.
-			 *
-			 * We have a duplicate now we need to decide which
-			 * one to use:
-			 *
-			 * Backwards scanning YAFFS2: The old one is what
-			 * we use, dump the new one.
-			 * YAFFS1: Get both sets of tags and compare serial
-			 * numbers.
-			 */
-
-			if (in_scan > 0) {
-				/* Only do this for forward scanning */
-				yaffs_rd_chunk_tags_nand(dev,
-							 nand_chunk,
-							 NULL, &new_tags);
-
-				/* Do a proper find */
-				existing_cunk =
-				    yaffs_find_chunk_in_file(in, inode_chunk,
-							     &existing_tags);
-			}
-
-			if (existing_cunk <= 0) {
-				/*Hoosterman - how did this happen? */
-
-				yaffs_trace(YAFFS_TRACE_ERROR,
-					"yaffs tragedy: existing chunk < 0 in scan"
-					);
-
-			}
-
-			/* NB The deleted flags should be false, otherwise
-			 * the chunks will not be loaded during a scan
-			 */
-
-			if (in_scan > 0) {
-				new_serial = new_tags.serial_number;
-				existing_serial = existing_tags.serial_number;
-			}
-
-			if ((in_scan > 0) &&
-			    (existing_cunk <= 0 ||
-			     ((existing_serial + 1) & 3) == new_serial)) {
-				/* Forward scanning.
-				 * Use new
-				 * Delete the old one and drop through to
-				 * update the tnode
-				 */
-				yaffs_chunk_del(dev, existing_cunk, 1,
-						__LINE__);
-			} else {
-				/* Backward scanning or we want to use the
-				 * existing one
-				 * Delete the new one and return early so that
-				 * the tnode isn't changed
-				 */
-				yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
-				return YAFFS_OK;
-			}
-		}
-
-	}
-
-	if (existing_cunk == 0)
-		in->n_data_chunks++;
-
-	yaffs_load_tnode_0(dev, tn, inode_chunk, nand_chunk);
-
-	return YAFFS_OK;
-}
-
-static void yaffs_soft_del_chunk(struct yaffs_dev *dev, int chunk)
-{
-	struct yaffs_block_info *the_block;
-	unsigned block_no;
-
-	yaffs_trace(YAFFS_TRACE_DELETION, "soft delete chunk %d", chunk);
-
-	block_no = chunk / dev->param.chunks_per_block;
-	the_block = yaffs_get_block_info(dev, block_no);
-	if (the_block) {
-		the_block->soft_del_pages++;
-		dev->n_free_chunks++;
-		yaffs2_update_oldest_dirty_seq(dev, block_no, the_block);
-	}
-}
-
-/* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all
- * the chunks in the file.
- * All soft deleting does is increment the block's softdelete count and pulls
- * the chunk out of the tnode.
- * Thus, essentially this is the same as DeleteWorker except that the chunks
- * are soft deleted.
- */
-
-static int yaffs_soft_del_worker(struct yaffs_obj *in, struct yaffs_tnode *tn,
-				 u32 level, int chunk_offset)
-{
-	int i;
-	int the_chunk;
-	int all_done = 1;
-	struct yaffs_dev *dev = in->my_dev;
-
-	if (!tn)
-		return 1;
-
-	if (level > 0) {
-		for (i = YAFFS_NTNODES_INTERNAL - 1;
-			all_done && i >= 0;
-			i--) {
-			if (tn->internal[i]) {
-				all_done =
-				    yaffs_soft_del_worker(in,
-					tn->internal[i],
-					level - 1,
-					(chunk_offset <<
-					YAFFS_TNODES_INTERNAL_BITS)
-					+ i);
-				if (all_done) {
-					yaffs_free_tnode(dev,
-						tn->internal[i]);
-					tn->internal[i] = NULL;
-				} else {
-					/* Can this happen? */
-				}
-			}
-		}
-		return (all_done) ? 1 : 0;
-	}
-
-	/* level 0 */
-	 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
-		the_chunk = yaffs_get_group_base(dev, tn, i);
-		if (the_chunk) {
-			yaffs_soft_del_chunk(dev, the_chunk);
-			yaffs_load_tnode_0(dev, tn, i, 0);
-		}
-	}
-	return 1;
-}
-
-static void yaffs_remove_obj_from_dir(struct yaffs_obj *obj)
-{
-	struct yaffs_dev *dev = obj->my_dev;
-	struct yaffs_obj *parent;
-
-	yaffs_verify_obj_in_dir(obj);
-	parent = obj->parent;
-
-	yaffs_verify_dir(parent);
-
-	if (dev && dev->param.remove_obj_fn)
-		dev->param.remove_obj_fn(obj);
-
-	list_del_init(&obj->siblings);
-	obj->parent = NULL;
-
-	yaffs_verify_dir(parent);
-}
-
-void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj)
-{
-	if (!directory) {
-		yaffs_trace(YAFFS_TRACE_ALWAYS,
-			"tragedy: Trying to add an object to a null pointer directory"
-			);
-		BUG();
-		return;
-	}
-	if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
-		yaffs_trace(YAFFS_TRACE_ALWAYS,
-			"tragedy: Trying to add an object to a non-directory"
-			);
-		BUG();
-	}
-
-	if (obj->siblings.prev == NULL) {
-		/* Not initialised */
-		BUG();
-	}
-
-	yaffs_verify_dir(directory);
-
-	yaffs_remove_obj_from_dir(obj);
-
-	/* Now add it */
-	list_add(&obj->siblings, &directory->variant.dir_variant.children);
-	obj->parent = directory;
-
-	if (directory == obj->my_dev->unlinked_dir
-	    || directory == obj->my_dev->del_dir) {
-		obj->unlinked = 1;
-		obj->my_dev->n_unlinked_files++;
-		obj->rename_allowed = 0;
-	}
-
-	yaffs_verify_dir(directory);
-	yaffs_verify_obj_in_dir(obj);
-}
-
-static int yaffs_change_obj_name(struct yaffs_obj *obj,
-				 struct yaffs_obj *new_dir,
-				 const YCHAR *new_name, int force, int shadows)
-{
-	int unlink_op;
-	int del_op;
-	struct yaffs_obj *existing_target;
-
-	if (new_dir == NULL)
-		new_dir = obj->parent;	/* use the old directory */
-
-	if (new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
-		yaffs_trace(YAFFS_TRACE_ALWAYS,
-			"tragedy: yaffs_change_obj_name: new_dir is not a directory"
-			);
-		BUG();
-	}
-
-	unlink_op = (new_dir == obj->my_dev->unlinked_dir);
-	del_op = (new_dir == obj->my_dev->del_dir);
-
-	existing_target = yaffs_find_by_name(new_dir, new_name);
-
-	/* If the object is a file going into the unlinked directory,
-	 *   then it is OK to just stuff it in since duplicate names are OK.
-	 *   else only proceed if the new name does not exist and we're putting
-	 *   it into a directory.
-	 */
-	if (!(unlink_op || del_op || force ||
-	      shadows > 0 || !existing_target) ||
-	      new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
-		return YAFFS_FAIL;
-
-	yaffs_set_obj_name(obj, new_name);
-	obj->dirty = 1;
-	yaffs_add_obj_to_dir(new_dir, obj);
-
-	if (unlink_op)
-		obj->unlinked = 1;
-
-	/* If it is a deletion then we mark it as a shrink for gc  */
-	if (yaffs_update_oh(obj, new_name, 0, del_op, shadows, NULL) >= 0)
-		return YAFFS_OK;
-
-	return YAFFS_FAIL;
-}
-
-/*------------------------ Short Operations Cache ------------------------------
- *   In many situations where there is no high level buffering  a lot of
- *   reads might be short sequential reads, and a lot of writes may be short
- *   sequential writes. eg. scanning/writing a jpeg file.
- *   In these cases, a short read/write cache can provide a huge perfomance
- *   benefit with dumb-as-a-rock code.
- *   In Linux, the page cache provides read buffering and the short op cache
- *   provides write buffering.
- *
- *   There are a small number (~10) of cache chunks per device so that we don't
- *   need a very intelligent search.
- */
-
-static int yaffs_obj_cache_dirty(struct yaffs_obj *obj)
-{
-	struct yaffs_dev *dev = obj->my_dev;
-	int i;
-	struct yaffs_cache *cache;
-	int n_caches = obj->my_dev->param.n_caches;
-
-	for (i = 0; i < n_caches; i++) {
-		cache = &dev->cache[i];
-		if (cache->object == obj && cache->dirty)
-			return 1;
-	}
-
-	return 0;
-}
-
-static void yaffs_flush_single_cache(struct yaffs_cache *cache, int discard)
-{
-
-	if (!cache || cache->locked)
-		return;
-
-	/* Write it out and free it up  if need be.*/
-	if (cache->dirty) {
-		yaffs_wr_data_obj(cache->object,
-				  cache->chunk_id,
-				  cache->data,
-				  cache->n_bytes,
-				  1);
-
-		cache->dirty = 0;
-	}
-
-	if (discard)
-		cache->object = NULL;
-}
-
-static void yaffs_flush_file_cache(struct yaffs_obj *obj, int discard)
-{
-	struct yaffs_dev *dev = obj->my_dev;
-	int i;
-	struct yaffs_cache *cache;
-	int n_caches = obj->my_dev->param.n_caches;
-
-	if (n_caches < 1)
-		return;
-
-
-	/* Find the chunks for this object and flush them. */
-	for (i = 0; i < n_caches; i++) {
-		cache = &dev->cache[i];
-		if (cache->object == obj)
-			yaffs_flush_single_cache(cache, discard);
-	}
-
-}
-
-
-void yaffs_flush_whole_cache(struct yaffs_dev *dev, int discard)
-{
-	struct yaffs_obj *obj;
-	int n_caches = dev->param.n_caches;
-	int i;
-
-	/* Find a dirty object in the cache and flush it...
-	 * until there are no further dirty objects.
-	 */
-	do {
-		obj = NULL;
-		for (i = 0; i < n_caches && !obj; i++) {
-			if (dev->cache[i].object && dev->cache[i].dirty)
-				obj = dev->cache[i].object;
-		}
-		if (obj)
-			yaffs_flush_file_cache(obj, discard);
-	} while (obj);
-
-}
-
-/* Grab us an unused cache chunk for use.
- * First look for an empty one.
- * Then look for the least recently used non-dirty one.
- * Then look for the least recently used dirty one...., flush and look again.
- */
-static struct yaffs_cache *yaffs_grab_chunk_worker(struct yaffs_dev *dev)
-{
-	int i;
-
-	if (dev->param.n_caches > 0) {
-		for (i = 0; i < dev->param.n_caches; i++) {
-			if (!dev->cache[i].object)
-				return &dev->cache[i];
-		}
-	}
-
-	return NULL;
-}
-
-static struct yaffs_cache *yaffs_grab_chunk_cache(struct yaffs_dev *dev)
-{
-	struct yaffs_cache *cache;
-	int usage;
-	int i;
-
-	if (dev->param.n_caches < 1)
-		return NULL;
-
-	/* First look for an unused cache */
-
-	cache = yaffs_grab_chunk_worker(dev);
-
-	if (cache)
-		return cache;
-
-	/*
-	 * Thery were all in use.
-	 * Find the LRU cache and flush it if it is dirty.
-	 */
-
-	usage = -1;
-	cache = NULL;
-
-	for (i = 0; i < dev->param.n_caches; i++) {
-		if (dev->cache[i].object &&
-		    !dev->cache[i].locked &&
-		    (dev->cache[i].last_use < usage || !cache)) {
-				usage = dev->cache[i].last_use;
-				cache = &dev->cache[i];
-		}
-	}
-
-#if 1
-	yaffs_flush_single_cache(cache, 1);
-#else
-	yaffs_flush_file_cache(cache->object, 1);
-	cache = yaffs_grab_chunk_worker(dev);
-#endif
-
-	return cache;
-}
-
-/* Find a cached chunk */
-static struct yaffs_cache *yaffs_find_chunk_cache(const struct yaffs_obj *obj,
-						  int chunk_id)
-{
-	struct yaffs_dev *dev = obj->my_dev;
-	int i;
-
-	if (dev->param.n_caches < 1)
-		return NULL;
-
-	for (i = 0; i < dev->param.n_caches; i++) {
-		if (dev->cache[i].object == obj &&
-		    dev->cache[i].chunk_id == chunk_id) {
-			dev->cache_hits++;
-
-			return &dev->cache[i];
-		}
-	}
-	return NULL;
-}
-
-/* Mark the chunk for the least recently used algorithym */
-static void yaffs_use_cache(struct yaffs_dev *dev, struct yaffs_cache *cache,
-			    int is_write)
-{
-	int i;
-
-	if (dev->param.n_caches < 1)
-		return;
-
-	if (dev->cache_last_use < 0 ||
-		dev->cache_last_use > 100000000) {
-		/* Reset the cache usages */
-		for (i = 1; i < dev->param.n_caches; i++)
-			dev->cache[i].last_use = 0;
-
-		dev->cache_last_use = 0;
-	}
-	dev->cache_last_use++;
-	cache->last_use = dev->cache_last_use;
-
-	if (is_write)
-		cache->dirty = 1;
-}
-
-/* Invalidate a single cache page.
- * Do this when a whole page gets written,
- * ie the short cache for this page is no longer valid.
- */
-static void yaffs_invalidate_chunk_cache(struct yaffs_obj *object, int chunk_id)
-{
-	struct yaffs_cache *cache;
-
-	if (object->my_dev->param.n_caches > 0) {
-		cache = yaffs_find_chunk_cache(object, chunk_id);
-
-		if (cache)
-			cache->object = NULL;
-	}
-}
-
-/* Invalidate all the cache pages associated with this object
- * Do this whenever ther file is deleted or resized.
- */
-static void yaffs_invalidate_whole_cache(struct yaffs_obj *in)
-{
-	int i;
-	struct yaffs_dev *dev = in->my_dev;
-
-	if (dev->param.n_caches > 0) {
-		/* Invalidate it. */
-		for (i = 0; i < dev->param.n_caches; i++) {
-			if (dev->cache[i].object == in)
-				dev->cache[i].object = NULL;
-		}
-	}
-}
-
-static void yaffs_unhash_obj(struct yaffs_obj *obj)
-{
-	int bucket;
-	struct yaffs_dev *dev = obj->my_dev;
-
-	/* If it is still linked into the bucket list, free from the list */
-	if (!list_empty(&obj->hash_link)) {
-		list_del_init(&obj->hash_link);
-		bucket = yaffs_hash_fn(obj->obj_id);
-		dev->obj_bucket[bucket].count--;
-	}
-}
-
-/*  FreeObject frees up a Object and puts it back on the free list */
-static void yaffs_free_obj(struct yaffs_obj *obj)
-{
-	struct yaffs_dev *dev;
-
-	if (!obj) {
-		BUG();
-		return;
-	}
-	dev = obj->my_dev;
-	yaffs_trace(YAFFS_TRACE_OS, "FreeObject %p inode %p",
-		obj, obj->my_inode);
-	if (obj->parent)
-		BUG();
-	if (!list_empty(&obj->siblings))
-		BUG();
-
-	if (obj->my_inode) {
-		/* We're still hooked up to a cached inode.
-		 * Don't delete now, but mark for later deletion
-		 */
-		obj->defered_free = 1;
-		return;
-	}
-
-	yaffs_unhash_obj(obj);
-
-	yaffs_free_raw_obj(dev, obj);
-	dev->n_obj--;
-	dev->checkpoint_blocks_required = 0;	/* force recalculation */
-}
-
-void yaffs_handle_defered_free(struct yaffs_obj *obj)
-{
-	if (obj->defered_free)
-		yaffs_free_obj(obj);
-}
-
-static int yaffs_generic_obj_del(struct yaffs_obj *in)
-{
-	/* Iinvalidate the file's data in the cache, without flushing. */
-	yaffs_invalidate_whole_cache(in);
-
-	if (in->my_dev->param.is_yaffs2 && in->parent != in->my_dev->del_dir) {
-		/* Move to unlinked directory so we have a deletion record */
-		yaffs_change_obj_name(in, in->my_dev->del_dir, _Y("deleted"), 0,
-				      0);
-	}
-
-	yaffs_remove_obj_from_dir(in);
-	yaffs_chunk_del(in->my_dev, in->hdr_chunk, 1, __LINE__);
-	in->hdr_chunk = 0;
-
-	yaffs_free_obj(in);
-	return YAFFS_OK;
-
-}
-
-static void yaffs_soft_del_file(struct yaffs_obj *obj)
-{
-	if (!obj->deleted ||
-	    obj->variant_type != YAFFS_OBJECT_TYPE_FILE ||
-	    obj->soft_del)
-		return;
-
-	if (obj->n_data_chunks <= 0) {
-		/* Empty file with no duplicate object headers,
-		 * just delete it immediately */
-		yaffs_free_tnode(obj->my_dev, obj->variant.file_variant.top);
-		obj->variant.file_variant.top = NULL;
-		yaffs_trace(YAFFS_TRACE_TRACING,
-			"yaffs: Deleting empty file %d",
-			obj->obj_id);
-		yaffs_generic_obj_del(obj);
-	} else {
-		yaffs_soft_del_worker(obj,
-				      obj->variant.file_variant.top,
-				      obj->variant.
-				      file_variant.top_level, 0);
-		obj->soft_del = 1;
-	}
-}
-
-/* Pruning removes any part of the file structure tree that is beyond the
- * bounds of the file (ie that does not point to chunks).
- *
- * A file should only get pruned when its size is reduced.
- *
- * Before pruning, the chunks must be pulled from the tree and the
- * level 0 tnode entries must be zeroed out.
- * Could also use this for file deletion, but that's probably better handled
- * by a special case.
- *
- * This function is recursive. For levels > 0 the function is called again on
- * any sub-tree. For level == 0 we just check if the sub-tree has data.
- * If there is no data in a subtree then it is pruned.
- */
-
-static struct yaffs_tnode *yaffs_prune_worker(struct yaffs_dev *dev,
-					      struct yaffs_tnode *tn, u32 level,
-					      int del0)
-{
-	int i;
-	int has_data;
-
-	if (!tn)
-		return tn;
-
-	has_data = 0;
-
-	if (level > 0) {
-		for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
-			if (tn->internal[i]) {
-				tn->internal[i] =
-				    yaffs_prune_worker(dev,
-						tn->internal[i],
-						level - 1,
-						(i == 0) ? del0 : 1);
-			}
-
-			if (tn->internal[i])
-				has_data++;
-		}
-	} else {
-		int tnode_size_u32 = dev->tnode_size / sizeof(u32);
-		u32 *map = (u32 *) tn;
-
-		for (i = 0; !has_data && i < tnode_size_u32; i++) {
-			if (map[i])
-				has_data++;
-		}
-	}
-
-	if (has_data == 0 && del0) {
-		/* Free and return NULL */
-		yaffs_free_tnode(dev, tn);
-		tn = NULL;
-	}
-	return tn;
-}
-
-static int yaffs_prune_tree(struct yaffs_dev *dev,
-			    struct yaffs_file_var *file_struct)
-{
-	int i;
-	int has_data;
-	int done = 0;
-	struct yaffs_tnode *tn;
-
-	if (file_struct->top_level < 1)
-		return YAFFS_OK;
-
-	file_struct->top =
-	   yaffs_prune_worker(dev, file_struct->top, file_struct->top_level, 0);
-
-	/* Now we have a tree with all the non-zero branches NULL but
-	 * the height is the same as it was.
-	 * Let's see if we can trim internal tnodes to shorten the tree.
-	 * We can do this if only the 0th element in the tnode is in use
-	 * (ie all the non-zero are NULL)
-	 */
-
-	while (file_struct->top_level && !done) {
-		tn = file_struct->top;
-
-		has_data = 0;
-		for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
-			if (tn->internal[i])
-				has_data++;
-		}
-
-		if (!has_data) {
-			file_struct->top = tn->internal[0];
-			file_struct->top_level--;
-			yaffs_free_tnode(dev, tn);
-		} else {
-			done = 1;
-		}
-	}
-
-	return YAFFS_OK;
-}
-
-/*-------------------- End of File Structure functions.-------------------*/
-
-/* alloc_empty_obj gets us a clean Object.*/
-static struct yaffs_obj *yaffs_alloc_empty_obj(struct yaffs_dev *dev)
-{
-	struct yaffs_obj *obj = yaffs_alloc_raw_obj(dev);
-
-	if (!obj)
-		return obj;
-
-	dev->n_obj++;
-
-	/* Now sweeten it up... */
-
-	memset(obj, 0, sizeof(struct yaffs_obj));
-	obj->being_created = 1;
-
-	obj->my_dev = dev;
-	obj->hdr_chunk = 0;
-	obj->variant_type = YAFFS_OBJECT_TYPE_UNKNOWN;
-	INIT_LIST_HEAD(&(obj->hard_links));
-	INIT_LIST_HEAD(&(obj->hash_link));
-	INIT_LIST_HEAD(&obj->siblings);
-
-	/* Now make the directory sane */
-	if (dev->root_dir) {
-		obj->parent = dev->root_dir;
-		list_add(&(obj->siblings),
-			 &dev->root_dir->variant.dir_variant.children);
-	}
-
-	/* Add it to the lost and found directory.
-	 * NB Can't put root or lost-n-found in lost-n-found so
-	 * check if lost-n-found exists first
-	 */
-	if (dev->lost_n_found)
-		yaffs_add_obj_to_dir(dev->lost_n_found, obj);
-
-	obj->being_created = 0;
-
-	dev->checkpoint_blocks_required = 0;	/* force recalculation */
-
-	return obj;
-}
-
-static int yaffs_find_nice_bucket(struct yaffs_dev *dev)
-{
-	int i;
-	int l = 999;
-	int lowest = 999999;
-
-	/* Search for the shortest list or one that
-	 * isn't too long.
-	 */
-
-	for (i = 0; i < 10 && lowest > 4; i++) {
-		dev->bucket_finder++;
-		dev->bucket_finder %= YAFFS_NOBJECT_BUCKETS;
-		if (dev->obj_bucket[dev->bucket_finder].count < lowest) {
-			lowest = dev->obj_bucket[dev->bucket_finder].count;
-			l = dev->bucket_finder;
-		}
-	}
-
-	return l;
-}
-
-static int yaffs_new_obj_id(struct yaffs_dev *dev)
-{
-	int bucket = yaffs_find_nice_bucket(dev);
-	int found = 0;
-	struct list_head *i;
-	u32 n = (u32) bucket;
-
-	/*
-	 * Now find an object value that has not already been taken
-	 * by scanning the list, incrementing each time by number of buckets.
-	 */
-	while (!found) {
-		found = 1;
-		n += YAFFS_NOBJECT_BUCKETS;
-		list_for_each(i, &dev->obj_bucket[bucket].list) {
-			/* Check if this value is already taken. */
-			if (i && list_entry(i, struct yaffs_obj,
-					    hash_link)->obj_id == n)
-				found = 0;
-		}
-	}
-	return n;
-}
-
-static void yaffs_hash_obj(struct yaffs_obj *in)
-{
-	int bucket = yaffs_hash_fn(in->obj_id);
-	struct yaffs_dev *dev = in->my_dev;
-
-	list_add(&in->hash_link, &dev->obj_bucket[bucket].list);
-	dev->obj_bucket[bucket].count++;
-}
-
-struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number)
-{
-	int bucket = yaffs_hash_fn(number);
-	struct list_head *i;
-	struct yaffs_obj *in;
-
-	list_for_each(i, &dev->obj_bucket[bucket].list) {
-		/* Look if it is in the list */
-		in = list_entry(i, struct yaffs_obj, hash_link);
-		if (in->obj_id == number) {
-			/* Don't show if it is defered free */
-			if (in->defered_free)
-				return NULL;
-			return in;
-		}
-	}
-
-	return NULL;
-}
-
-static struct yaffs_obj *yaffs_new_obj(struct yaffs_dev *dev, int number,
-				enum yaffs_obj_type type)
-{
-	struct yaffs_obj *the_obj = NULL;
-	struct yaffs_tnode *tn = NULL;
-
-	if (number < 0)
-		number = yaffs_new_obj_id(dev);
-
-	if (type == YAFFS_OBJECT_TYPE_FILE) {
-		tn = yaffs_get_tnode(dev);
-		if (!tn)
-			return NULL;
-	}
-
-	the_obj = yaffs_alloc_empty_obj(dev);
-	if (!the_obj) {
-		if (tn)
-			yaffs_free_tnode(dev, tn);
-		return NULL;
-	}
-
-	the_obj->fake = 0;
-	the_obj->rename_allowed = 1;
-	the_obj->unlink_allowed = 1;
-	the_obj->obj_id = number;
-	yaffs_hash_obj(the_obj);
-	the_obj->variant_type = type;
-	yaffs_load_current_time(the_obj, 1, 1);
-
-	switch (type) {
-	case YAFFS_OBJECT_TYPE_FILE:
-		the_obj->variant.file_variant.file_size = 0;
-		the_obj->variant.file_variant.scanned_size = 0;
-		the_obj->variant.file_variant.shrink_size =
-						yaffs_max_file_size(dev);
-		the_obj->variant.file_variant.top_level = 0;
-		the_obj->variant.file_variant.top = tn;
-		break;
-	case YAFFS_OBJECT_TYPE_DIRECTORY:
-		INIT_LIST_HEAD(&the_obj->variant.dir_variant.children);
-		INIT_LIST_HEAD(&the_obj->variant.dir_variant.dirty);
-		break;
-	case YAFFS_OBJECT_TYPE_SYMLINK:
-	case YAFFS_OBJECT_TYPE_HARDLINK:
-	case YAFFS_OBJECT_TYPE_SPECIAL:
-		/* No action required */
-		break;
-	case YAFFS_OBJECT_TYPE_UNKNOWN:
-		/* todo this should not happen */
-		break;
-	}
-	return the_obj;
-}
-
-static struct yaffs_obj *yaffs_create_fake_dir(struct yaffs_dev *dev,
-					       int number, u32 mode)
-{
-
-	struct yaffs_obj *obj =
-	    yaffs_new_obj(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
-
-	if (!obj)
-		return NULL;
-
-	obj->fake = 1;	/* it is fake so it might not use NAND */
-	obj->rename_allowed = 0;
-	obj->unlink_allowed = 0;
-	obj->deleted = 0;
-	obj->unlinked = 0;
-	obj->yst_mode = mode;
-	obj->my_dev = dev;
-	obj->hdr_chunk = 0;	/* Not a valid chunk. */
-	return obj;
-
-}
-
-
-static void yaffs_init_tnodes_and_objs(struct yaffs_dev *dev)
-{
-	int i;
-
-	dev->n_obj = 0;
-	dev->n_tnodes = 0;
-	yaffs_init_raw_tnodes_and_objs(dev);
-
-	for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
-		INIT_LIST_HEAD(&dev->obj_bucket[i].list);
-		dev->obj_bucket[i].count = 0;
-	}
-}
-
-struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev,
-						 int number,
-						 enum yaffs_obj_type type)
-{
-	struct yaffs_obj *the_obj = NULL;
-
-	if (number > 0)
-		the_obj = yaffs_find_by_number(dev, number);
-
-	if (!the_obj)
-		the_obj = yaffs_new_obj(dev, number, type);
-
-	return the_obj;
-
-}
-
-YCHAR *yaffs_clone_str(const YCHAR *str)
-{
-	YCHAR *new_str = NULL;
-	int len;
-
-	if (!str)
-		str = _Y("");
-
-	len = strnlen(str, YAFFS_MAX_ALIAS_LENGTH);
-	new_str = kmalloc((len + 1) * sizeof(YCHAR), GFP_NOFS);
-	if (new_str) {
-		strncpy(new_str, str, len);
-		new_str[len] = 0;
-	}
-	return new_str;
-
-}
-/*
- *yaffs_update_parent() handles fixing a directories mtime and ctime when a new
- * link (ie. name) is created or deleted in the directory.
- *
- * ie.
- *   create dir/a : update dir's mtime/ctime
- *   rm dir/a:   update dir's mtime/ctime
- *   modify dir/a: don't update dir's mtimme/ctime
- *
- * This can be handled immediately or defered. Defering helps reduce the number
- * of updates when many files in a directory are changed within a brief period.
- *
- * If the directory updating is defered then yaffs_update_dirty_dirs must be
- * called periodically.
- */
-
-static void yaffs_update_parent(struct yaffs_obj *obj)
-{
-	struct yaffs_dev *dev;
-
-	if (!obj)
-		return;
-	dev = obj->my_dev;
-	obj->dirty = 1;
-	yaffs_load_current_time(obj, 0, 1);
-	if (dev->param.defered_dir_update) {
-		struct list_head *link = &obj->variant.dir_variant.dirty;
-
-		if (list_empty(link)) {
-			list_add(link, &dev->dirty_dirs);
-			yaffs_trace(YAFFS_TRACE_BACKGROUND,
-			  "Added object %d to dirty directories",
-			   obj->obj_id);
-		}
-
-	} else {
-		yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
-	}
-}
-
-void yaffs_update_dirty_dirs(struct yaffs_dev *dev)
-{
-	struct list_head *link;
-	struct yaffs_obj *obj;
-	struct yaffs_dir_var *d_s;
-	union yaffs_obj_var *o_v;
-
-	yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update dirty directories");
-
-	while (!list_empty(&dev->dirty_dirs)) {
-		link = dev->dirty_dirs.next;
-		list_del_init(link);
-
-		d_s = list_entry(link, struct yaffs_dir_var, dirty);
-		o_v = list_entry(d_s, union yaffs_obj_var, dir_variant);
-		obj = list_entry(o_v, struct yaffs_obj, variant);
-
-		yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update directory %d",
-			obj->obj_id);
-
-		if (obj->dirty)
-			yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
-	}
-}
-
-/*
- * Mknod (create) a new object.
- * equiv_obj only has meaning for a hard link;
- * alias_str only has meaning for a symlink.
- * rdev only has meaning for devices (a subset of special objects)
- */
-
-static struct yaffs_obj *yaffs_create_obj(enum yaffs_obj_type type,
-					  struct yaffs_obj *parent,
-					  const YCHAR *name,
-					  u32 mode,
-					  u32 uid,
-					  u32 gid,
-					  struct yaffs_obj *equiv_obj,
-					  const YCHAR *alias_str, u32 rdev)
-{
-	struct yaffs_obj *in;
-	YCHAR *str = NULL;
-	struct yaffs_dev *dev = parent->my_dev;
-
-	/* Check if the entry exists.
-	 * If it does then fail the call since we don't want a dup. */
-	if (yaffs_find_by_name(parent, name))
-		return NULL;
-
-	if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
-		str = yaffs_clone_str(alias_str);
-		if (!str)
-			return NULL;
-	}
-
-	in = yaffs_new_obj(dev, -1, type);
-
-	if (!in) {
-		kfree(str);
-		return NULL;
-	}
-
-	in->hdr_chunk = 0;
-	in->valid = 1;
-	in->variant_type = type;
-
-	in->yst_mode = mode;
-
-	yaffs_attribs_init(in, gid, uid, rdev);
-
-	in->n_data_chunks = 0;
-
-	yaffs_set_obj_name(in, name);
-	in->dirty = 1;
-
-	yaffs_add_obj_to_dir(parent, in);
-
-	in->my_dev = parent->my_dev;
-
-	switch (type) {
-	case YAFFS_OBJECT_TYPE_SYMLINK:
-		in->variant.symlink_variant.alias = str;
-		break;
-	case YAFFS_OBJECT_TYPE_HARDLINK:
-		in->variant.hardlink_variant.equiv_obj = equiv_obj;
-		in->variant.hardlink_variant.equiv_id = equiv_obj->obj_id;
-		list_add(&in->hard_links, &equiv_obj->hard_links);
-		break;
-	case YAFFS_OBJECT_TYPE_FILE:
-	case YAFFS_OBJECT_TYPE_DIRECTORY:
-	case YAFFS_OBJECT_TYPE_SPECIAL:
-	case YAFFS_OBJECT_TYPE_UNKNOWN:
-		/* do nothing */
-		break;
-	}
-
-	if (yaffs_update_oh(in, name, 0, 0, 0, NULL) < 0) {
-		/* Could not create the object header, fail */
-		yaffs_del_obj(in);
-		in = NULL;
-	}
-
-	if (in)
-		yaffs_update_parent(parent);
-
-	return in;
-}
-
-struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent,
-				    const YCHAR *name, u32 mode, u32 uid,
-				    u32 gid)
-{
-	return yaffs_create_obj(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
-				uid, gid, NULL, NULL, 0);
-}
-
-struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR *name,
-				   u32 mode, u32 uid, u32 gid)
-{
-	return yaffs_create_obj(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
-				mode, uid, gid, NULL, NULL, 0);
-}
-
-struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent,
-				       const YCHAR *name, u32 mode, u32 uid,
-				       u32 gid, u32 rdev)
-{
-	return yaffs_create_obj(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
-				uid, gid, NULL, NULL, rdev);
-}
-
-struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent,
-				       const YCHAR *name, u32 mode, u32 uid,
-				       u32 gid, const YCHAR *alias)
-{
-	return yaffs_create_obj(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
-				uid, gid, NULL, alias, 0);
-}
-
-/* yaffs_link_obj returns the object id of the equivalent object.*/
-struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR * name,
-				 struct yaffs_obj *equiv_obj)
-{
-	/* Get the real object in case we were fed a hard link obj */
-	equiv_obj = yaffs_get_equivalent_obj(equiv_obj);
-
-	if (yaffs_create_obj(YAFFS_OBJECT_TYPE_HARDLINK,
-			parent, name, 0, 0, 0,
-			equiv_obj, NULL, 0))
-		return equiv_obj;
-
-	return NULL;
-
-}
-
-
-
-/*---------------------- Block Management and Page Allocation -------------*/
-
-static void yaffs_deinit_blocks(struct yaffs_dev *dev)
-{
-	if (dev->block_info_alt && dev->block_info)
-		vfree(dev->block_info);
-	else
-		kfree(dev->block_info);
-
-	dev->block_info_alt = 0;
-
-	dev->block_info = NULL;
-
-	if (dev->chunk_bits_alt && dev->chunk_bits)
-		vfree(dev->chunk_bits);
-	else
-		kfree(dev->chunk_bits);
-	dev->chunk_bits_alt = 0;
-	dev->chunk_bits = NULL;
-}
-
-static int yaffs_init_blocks(struct yaffs_dev *dev)
-{
-	int n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
-
-	dev->block_info = NULL;
-	dev->chunk_bits = NULL;
-	dev->alloc_block = -1;	/* force it to get a new one */
-
-	/* If the first allocation strategy fails, thry the alternate one */
-	dev->block_info =
-		kmalloc(n_blocks * sizeof(struct yaffs_block_info), GFP_NOFS);
-	if (!dev->block_info) {
-		dev->block_info =
-		    vmalloc(n_blocks * sizeof(struct yaffs_block_info));
-		dev->block_info_alt = 1;
-	} else {
-		dev->block_info_alt = 0;
-	}
-
-	if (!dev->block_info)
-		goto alloc_error;
-
-	/* Set up dynamic blockinfo stuff. Round up bytes. */
-	dev->chunk_bit_stride = (dev->param.chunks_per_block + 7) / 8;
-	dev->chunk_bits =
-		kmalloc(dev->chunk_bit_stride * n_blocks, GFP_NOFS);
-	if (!dev->chunk_bits) {
-		dev->chunk_bits =
-		    vmalloc(dev->chunk_bit_stride * n_blocks);
-		dev->chunk_bits_alt = 1;
-	} else {
-		dev->chunk_bits_alt = 0;
-	}
-	if (!dev->chunk_bits)
-		goto alloc_error;
-
-
-	memset(dev->block_info, 0, n_blocks * sizeof(struct yaffs_block_info));
-	memset(dev->chunk_bits, 0, dev->chunk_bit_stride * n_blocks);
-	return YAFFS_OK;
-
-alloc_error:
-	yaffs_deinit_blocks(dev);
-	return YAFFS_FAIL;
-}
-
-
-void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no)
-{
-	struct yaffs_block_info *bi = yaffs_get_block_info(dev, block_no);
-	int erased_ok = 0;
-	int i;
-
-	/* If the block is still healthy erase it and mark as clean.
-	 * If the block has had a data failure, then retire it.
-	 */
-
-	yaffs_trace(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
-		"yaffs_block_became_dirty block %d state %d %s",
-		block_no, bi->block_state,
-		(bi->needs_retiring) ? "needs retiring" : "");
-
-	yaffs2_clear_oldest_dirty_seq(dev, bi);
-
-	bi->block_state = YAFFS_BLOCK_STATE_DIRTY;
-
-	/* If this is the block being garbage collected then stop gc'ing */
-	if (block_no == dev->gc_block)
-		dev->gc_block = 0;
-
-	/* If this block is currently the best candidate for gc
-	 * then drop as a candidate */
-	if (block_no == dev->gc_dirtiest) {
-		dev->gc_dirtiest = 0;
-		dev->gc_pages_in_use = 0;
-	}
-
-	if (!bi->needs_retiring) {
-		yaffs2_checkpt_invalidate(dev);
-		erased_ok = yaffs_erase_block(dev, block_no);
-		if (!erased_ok) {
-			dev->n_erase_failures++;
-			yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
-			  "**>> Erasure failed %d", block_no);
-		}
-	}
-
-	/* Verify erasure if needed */
-	if (erased_ok &&
-	    ((yaffs_trace_mask & YAFFS_TRACE_ERASE) ||
-	     !yaffs_skip_verification(dev))) {
-		for (i = 0; i < dev->param.chunks_per_block; i++) {
-			if (!yaffs_check_chunk_erased(dev,
-				block_no * dev->param.chunks_per_block + i)) {
-				yaffs_trace(YAFFS_TRACE_ERROR,
-					">>Block %d erasure supposedly OK, but chunk %d not erased",
-					block_no, i);
-			}
-		}
-	}
-
-	if (!erased_ok) {
-		/* We lost a block of free space */
-		dev->n_free_chunks -= dev->param.chunks_per_block;
-		yaffs_retire_block(dev, block_no);
-		yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
-			"**>> Block %d retired", block_no);
-		return;
-	}
-
-	/* Clean it up... */
-	bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
-	bi->seq_number = 0;
-	dev->n_erased_blocks++;
-	bi->pages_in_use = 0;
-	bi->soft_del_pages = 0;
-	bi->has_shrink_hdr = 0;
-	bi->skip_erased_check = 1;	/* Clean, so no need to check */
-	bi->gc_prioritise = 0;
-	bi->has_summary = 0;
-
-	yaffs_clear_chunk_bits(dev, block_no);
-
-	yaffs_trace(YAFFS_TRACE_ERASE, "Erased block %d", block_no);
-}
-
-static inline int yaffs_gc_process_chunk(struct yaffs_dev *dev,
-					struct yaffs_block_info *bi,
-					int old_chunk, u8 *buffer)
-{
-	int new_chunk;
-	int mark_flash = 1;
-	struct yaffs_ext_tags tags;
-	struct yaffs_obj *object;
-	int matching_chunk;
-	int ret_val = YAFFS_OK;
-
-	memset(&tags, 0, sizeof(tags));
-	yaffs_rd_chunk_tags_nand(dev, old_chunk,
-				 buffer, &tags);
-	object = yaffs_find_by_number(dev, tags.obj_id);
-
-	yaffs_trace(YAFFS_TRACE_GC_DETAIL,
-		"Collecting chunk in block %d, %d %d %d ",
-		dev->gc_chunk, tags.obj_id,
-		tags.chunk_id, tags.n_bytes);
-
-	if (object && !yaffs_skip_verification(dev)) {
-		if (tags.chunk_id == 0)
-			matching_chunk =
-			    object->hdr_chunk;
-		else if (object->soft_del)
-			/* Defeat the test */
-			matching_chunk = old_chunk;
-		else
-			matching_chunk =
-			    yaffs_find_chunk_in_file
-			    (object, tags.chunk_id,
-			     NULL);
-
-		if (old_chunk != matching_chunk)
-			yaffs_trace(YAFFS_TRACE_ERROR,
-				"gc: page in gc mismatch: %d %d %d %d",
-				old_chunk,
-				matching_chunk,
-				tags.obj_id,
-				tags.chunk_id);
-	}
-
-	if (!object) {
-		yaffs_trace(YAFFS_TRACE_ERROR,
-			"page %d in gc has no object: %d %d %d ",
-			old_chunk,
-			tags.obj_id, tags.chunk_id,
-			tags.n_bytes);
-	}
-
-	if (object &&
-	    object->deleted &&
-	    object->soft_del && tags.chunk_id != 0) {
-		/* Data chunk in a soft deleted file,
-		 * throw it away.
-		 * It's a soft deleted data chunk,
-		 * No need to copy this, just forget
-		 * about it and fix up the object.
-		 */
-
-		/* Free chunks already includes
-		 * softdeleted chunks, how ever this
-		 * chunk is going to soon be really
-		 * deleted which will increment free
-		 * chunks. We have to decrement free
-		 * chunks so this works out properly.
-		 */
-		dev->n_free_chunks--;
-		bi->soft_del_pages--;
-
-		object->n_data_chunks--;
-		if (object->n_data_chunks <= 0) {
-			/* remeber to clean up obj */
-			dev->gc_cleanup_list[dev->n_clean_ups] = tags.obj_id;
-			dev->n_clean_ups++;
-		}
-		mark_flash = 0;
-	} else if (object) {
-		/* It's either a data chunk in a live
-		 * file or an ObjectHeader, so we're
-		 * interested in it.
-		 * NB Need to keep the ObjectHeaders of
-		 * deleted files until the whole file
-		 * has been deleted off
-		 */
-		tags.serial_number++;
-		dev->n_gc_copies++;
-
-		if (tags.chunk_id == 0) {
-			/* It is an object Id,
-			 * We need to nuke the
-			 * shrinkheader flags since its
-			 * work is done.
-			 * Also need to clean up
-			 * shadowing.
-			 */
-			struct yaffs_obj_hdr *oh;
-			oh = (struct yaffs_obj_hdr *) buffer;
-
-			oh->is_shrink = 0;
-			tags.extra_is_shrink = 0;
-			oh->shadows_obj = 0;
-			oh->inband_shadowed_obj_id = 0;
-			tags.extra_shadows = 0;
-
-			/* Update file size */
-			if (object->variant_type == YAFFS_OBJECT_TYPE_FILE) {
-				yaffs_oh_size_load(oh,
-				    object->variant.file_variant.file_size);
-				tags.extra_file_size =
-				    object->variant.file_variant.file_size;
-			}
-
-			yaffs_verify_oh(object, oh, &tags, 1);
-			new_chunk =
-			    yaffs_write_new_chunk(dev, (u8 *) oh, &tags, 1);
-		} else {
-			new_chunk =
-			    yaffs_write_new_chunk(dev, buffer, &tags, 1);
-		}
-
-		if (new_chunk < 0) {
-			ret_val = YAFFS_FAIL;
-		} else {
-
-			/* Now fix up the Tnodes etc. */
-
-			if (tags.chunk_id == 0) {
-				/* It's a header */
-				object->hdr_chunk = new_chunk;
-				object->serial = tags.serial_number;
-			} else {
-				/* It's a data chunk */
-				yaffs_put_chunk_in_file(object, tags.chunk_id,
-							new_chunk, 0);
-			}
-		}
-	}
-	if (ret_val == YAFFS_OK)
-		yaffs_chunk_del(dev, old_chunk, mark_flash, __LINE__);
-	return ret_val;
-}
-
-static int yaffs_gc_block(struct yaffs_dev *dev, int block, int whole_block)
-{
-	int old_chunk;
-	int ret_val = YAFFS_OK;
-	int i;
-	int is_checkpt_block;
-	int max_copies;
-	int chunks_before = yaffs_get_erased_chunks(dev);
-	int chunks_after;
-	struct yaffs_block_info *bi = yaffs_get_block_info(dev, block);
-
-	is_checkpt_block = (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT);
-
-	yaffs_trace(YAFFS_TRACE_TRACING,
-		"Collecting block %d, in use %d, shrink %d, whole_block %d",
-		block, bi->pages_in_use, bi->has_shrink_hdr,
-		whole_block);
-
-	/*yaffs_verify_free_chunks(dev); */
-
-	if (bi->block_state == YAFFS_BLOCK_STATE_FULL)
-		bi->block_state = YAFFS_BLOCK_STATE_COLLECTING;
-
-	bi->has_shrink_hdr = 0;	/* clear the flag so that the block can erase */
-
-	dev->gc_disable = 1;
-
-	yaffs_summary_gc(dev, block);
-
-	if (is_checkpt_block || !yaffs_still_some_chunks(dev, block)) {
-		yaffs_trace(YAFFS_TRACE_TRACING,
-			"Collecting block %d that has no chunks in use",
-			block);
-		yaffs_block_became_dirty(dev, block);
-	} else {
-
-		u8 *buffer = yaffs_get_temp_buffer(dev);
-
-		yaffs_verify_blk(dev, bi, block);
-
-		max_copies = (whole_block) ? dev->param.chunks_per_block : 5;
-		old_chunk = block * dev->param.chunks_per_block + dev->gc_chunk;
-
-		for (/* init already done */ ;
-		     ret_val == YAFFS_OK &&
-		     dev->gc_chunk < dev->param.chunks_per_block &&
-		     (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) &&
-		     max_copies > 0;
-		     dev->gc_chunk++, old_chunk++) {
-			if (yaffs_check_chunk_bit(dev, block, dev->gc_chunk)) {
-				/* Page is in use and might need to be copied */
-				max_copies--;
-				ret_val = yaffs_gc_process_chunk(dev, bi,
-							old_chunk, buffer);
-			}
-		}
-		yaffs_release_temp_buffer(dev, buffer);
-	}
-
-	yaffs_verify_collected_blk(dev, bi, block);
-
-	if (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
-		/*
-		 * The gc did not complete. Set block state back to FULL
-		 * because checkpointing does not restore gc.
-		 */
-		bi->block_state = YAFFS_BLOCK_STATE_FULL;
-	} else {
-		/* The gc completed. */
-		/* Do any required cleanups */
-		for (i = 0; i < dev->n_clean_ups; i++) {
-			/* Time to delete the file too */
-			struct yaffs_obj *object =
-			    yaffs_find_by_number(dev, dev->gc_cleanup_list[i]);
-			if (object) {
-				yaffs_free_tnode(dev,
-					  object->variant.file_variant.top);
-				object->variant.file_variant.top = NULL;
-				yaffs_trace(YAFFS_TRACE_GC,
-					"yaffs: About to finally delete object %d",
-					object->obj_id);
-				yaffs_generic_obj_del(object);
-				object->my_dev->n_deleted_files--;
-			}
-
-		}
-		chunks_after = yaffs_get_erased_chunks(dev);
-		if (chunks_before >= chunks_after)
-			yaffs_trace(YAFFS_TRACE_GC,
-				"gc did not increase free chunks before %d after %d",
-				chunks_before, chunks_after);
-		dev->gc_block = 0;
-		dev->gc_chunk = 0;
-		dev->n_clean_ups = 0;
-	}
-
-	dev->gc_disable = 0;
-
-	return ret_val;
-}
-
-/*
- * find_gc_block() selects the dirtiest block (or close enough)
- * for garbage collection.
- */
-
-static unsigned yaffs_find_gc_block(struct yaffs_dev *dev,
-				    int aggressive, int background)
-{
-	int i;
-	int iterations;
-	unsigned selected = 0;
-	int prioritised = 0;
-	int prioritised_exist = 0;
-	struct yaffs_block_info *bi;
-	int threshold;
-
-	/* First let's see if we need to grab a prioritised block */
-	if (dev->has_pending_prioritised_gc && !aggressive) {
-		dev->gc_dirtiest = 0;
-		bi = dev->block_info;
-		for (i = dev->internal_start_block;
-		     i <= dev->internal_end_block && !selected; i++) {
-
-			if (bi->gc_prioritise) {
-				prioritised_exist = 1;
-				if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
-				    yaffs_block_ok_for_gc(dev, bi)) {
-					selected = i;
-					prioritised = 1;
-				}
-			}
-			bi++;
-		}
-
-		/*
-		 * If there is a prioritised block and none was selected then
-		 * this happened because there is at least one old dirty block
-		 * gumming up the works. Let's gc the oldest dirty block.
-		 */
-
-		if (prioritised_exist &&
-		    !selected && dev->oldest_dirty_block > 0)
-			selected = dev->oldest_dirty_block;
-
-		if (!prioritised_exist)	/* None found, so we can clear this */
-			dev->has_pending_prioritised_gc = 0;
-	}
-
-	/* If we're doing aggressive GC then we are happy to take a less-dirty
-	 * block, and search harder.
-	 * else (leasurely gc), then we only bother to do this if the
-	 * block has only a few pages in use.
-	 */
-
-	if (!selected) {
-		int pages_used;
-		int n_blocks =
-		    dev->internal_end_block - dev->internal_start_block + 1;
-		if (aggressive) {
-			threshold = dev->param.chunks_per_block;
-			iterations = n_blocks;
-		} else {
-			int max_threshold;
-
-			if (background)
-				max_threshold = dev->param.chunks_per_block / 2;
-			else
-				max_threshold = dev->param.chunks_per_block / 8;
-
-			if (max_threshold < YAFFS_GC_PASSIVE_THRESHOLD)
-				max_threshold = YAFFS_GC_PASSIVE_THRESHOLD;
-
-			threshold = background ? (dev->gc_not_done + 2) * 2 : 0;
-			if (threshold < YAFFS_GC_PASSIVE_THRESHOLD)
-				threshold = YAFFS_GC_PASSIVE_THRESHOLD;
-			if (threshold > max_threshold)
-				threshold = max_threshold;
-
-			iterations = n_blocks / 16 + 1;
-			if (iterations > 100)
-				iterations = 100;
-		}
-
-		for (i = 0;
-		     i < iterations &&
-		     (dev->gc_dirtiest < 1 ||
-		      dev->gc_pages_in_use > YAFFS_GC_GOOD_ENOUGH);
-		     i++) {
-			dev->gc_block_finder++;
-			if (dev->gc_block_finder < dev->internal_start_block ||
-			    dev->gc_block_finder > dev->internal_end_block)
-				dev->gc_block_finder =
-				    dev->internal_start_block;
-
-			bi = yaffs_get_block_info(dev, dev->gc_block_finder);
-
-			pages_used = bi->pages_in_use - bi->soft_del_pages;
-
-			if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
-			    pages_used < dev->param.chunks_per_block &&
-			    (dev->gc_dirtiest < 1 ||
-			     pages_used < dev->gc_pages_in_use) &&
-			    yaffs_block_ok_for_gc(dev, bi)) {
-				dev->gc_dirtiest = dev->gc_block_finder;
-				dev->gc_pages_in_use = pages_used;
-			}
-		}
-
-		if (dev->gc_dirtiest > 0 && dev->gc_pages_in_use <= threshold)
-			selected = dev->gc_dirtiest;
-	}
-
-	/*
-	 * If nothing has been selected for a while, try the oldest dirty
-	 * because that's gumming up the works.
-	 */
-
-	if (!selected && dev->param.is_yaffs2 &&
-	    dev->gc_not_done >= (background ? 10 : 20)) {
-		yaffs2_find_oldest_dirty_seq(dev);
-		if (dev->oldest_dirty_block > 0) {
-			selected = dev->oldest_dirty_block;
-			dev->gc_dirtiest = selected;
-			dev->oldest_dirty_gc_count++;
-			bi = yaffs_get_block_info(dev, selected);
-			dev->gc_pages_in_use =
-			    bi->pages_in_use - bi->soft_del_pages;
-		} else {
-			dev->gc_not_done = 0;
-		}
-	}
-
-	if (selected) {
-		yaffs_trace(YAFFS_TRACE_GC,
-			"GC Selected block %d with %d free, prioritised:%d",
-			selected,
-			dev->param.chunks_per_block - dev->gc_pages_in_use,
-			prioritised);
-
-		dev->n_gc_blocks++;
-		if (background)
-			dev->bg_gcs++;
-
-		dev->gc_dirtiest = 0;
-		dev->gc_pages_in_use = 0;
-		dev->gc_not_done = 0;
-		if (dev->refresh_skip > 0)
-			dev->refresh_skip--;
-	} else {
-		dev->gc_not_done++;
-		yaffs_trace(YAFFS_TRACE_GC,
-			"GC none: finder %d skip %d threshold %d dirtiest %d using %d oldest %d%s",
-			dev->gc_block_finder, dev->gc_not_done, threshold,
-			dev->gc_dirtiest, dev->gc_pages_in_use,
-			dev->oldest_dirty_block, background ? " bg" : "");
-	}
-
-	return selected;
-}
-
-/* New garbage collector
- * If we're very low on erased blocks then we do aggressive garbage collection
- * otherwise we do "leasurely" garbage collection.
- * Aggressive gc looks further (whole array) and will accept less dirty blocks.
- * Passive gc only inspects smaller areas and only accepts more dirty blocks.
- *
- * The idea is to help clear out space in a more spread-out manner.
- * Dunno if it really does anything useful.
- */
-static int yaffs_check_gc(struct yaffs_dev *dev, int background)
-{
-	int aggressive = 0;
-	int gc_ok = YAFFS_OK;
-	int max_tries = 0;
-	int min_erased;
-	int erased_chunks;
-	int checkpt_block_adjust;
-
-	if (dev->param.gc_control_fn &&
-		(dev->param.gc_control_fn(dev) & 1) == 0)
-		return YAFFS_OK;
-
-	if (dev->gc_disable)
-		/* Bail out so we don't get recursive gc */
-		return YAFFS_OK;
-
-	/* This loop should pass the first time.
-	 * Only loops here if the collection does not increase space.
-	 */
-
-	do {
-		max_tries++;
-
-		checkpt_block_adjust = yaffs_calc_checkpt_blocks_required(dev);
-
-		min_erased =
-		    dev->param.n_reserved_blocks + checkpt_block_adjust + 1;
-		erased_chunks =
-		    dev->n_erased_blocks * dev->param.chunks_per_block;
-
-		/* If we need a block soon then do aggressive gc. */
-		if (dev->n_erased_blocks < min_erased)
-			aggressive = 1;
-		else {
-			if (!background
-			    && erased_chunks > (dev->n_free_chunks / 4))
-				break;
-
-			if (dev->gc_skip > 20)
-				dev->gc_skip = 20;
-			if (erased_chunks < dev->n_free_chunks / 2 ||
-			    dev->gc_skip < 1 || background)
-				aggressive = 0;
-			else {
-				dev->gc_skip--;
-				break;
-			}
-		}
-
-		dev->gc_skip = 5;
-
-		/* If we don't already have a block being gc'd then see if we
-		 * should start another */
-
-		if (dev->gc_block < 1 && !aggressive) {
-			dev->gc_block = yaffs2_find_refresh_block(dev);
-			dev->gc_chunk = 0;
-			dev->n_clean_ups = 0;
-		}
-		if (dev->gc_block < 1) {
-			dev->gc_block =
-			    yaffs_find_gc_block(dev, aggressive, background);
-			dev->gc_chunk = 0;
-			dev->n_clean_ups = 0;
-		}
-
-		if (dev->gc_block > 0) {
-			dev->all_gcs++;
-			if (!aggressive)
-				dev->passive_gc_count++;
-
-			yaffs_trace(YAFFS_TRACE_GC,
-				"yaffs: GC n_erased_blocks %d aggressive %d",
-				dev->n_erased_blocks, aggressive);
-
-			gc_ok = yaffs_gc_block(dev, dev->gc_block, aggressive);
-		}
-
-		if (dev->n_erased_blocks < (dev->param.n_reserved_blocks) &&
-		    dev->gc_block > 0) {
-			yaffs_trace(YAFFS_TRACE_GC,
-				"yaffs: GC !!!no reclaim!!! n_erased_blocks %d after try %d block %d",
-				dev->n_erased_blocks, max_tries,
-				dev->gc_block);
-		}
-	} while ((dev->n_erased_blocks < dev->param.n_reserved_blocks) &&
-		 (dev->gc_block > 0) && (max_tries < 2));
-
-	return aggressive ? gc_ok : YAFFS_OK;
-}
-
-/*
- * yaffs_bg_gc()
- * Garbage collects. Intended to be called from a background thread.
- * Returns non-zero if at least half the free chunks are erased.
- */
-int yaffs_bg_gc(struct yaffs_dev *dev, unsigned urgency)
-{
-	int erased_chunks = dev->n_erased_blocks * dev->param.chunks_per_block;
-
-	yaffs_trace(YAFFS_TRACE_BACKGROUND, "Background gc %u", urgency);
-
-	yaffs_check_gc(dev, 1);
-	return erased_chunks > dev->n_free_chunks / 2;
-}
-
-/*-------------------- Data file manipulation -----------------*/
-
-static int yaffs_rd_data_obj(struct yaffs_obj *in, int inode_chunk, u8 * buffer)
-{
-	int nand_chunk = yaffs_find_chunk_in_file(in, inode_chunk, NULL);
-
-	if (nand_chunk >= 0)
-		return yaffs_rd_chunk_tags_nand(in->my_dev, nand_chunk,
-						buffer, NULL);
-	else {
-		yaffs_trace(YAFFS_TRACE_NANDACCESS,
-			"Chunk %d not found zero instead",
-			nand_chunk);
-		/* get sane (zero) data if you read a hole */
-		memset(buffer, 0, in->my_dev->data_bytes_per_chunk);
-		return 0;
-	}
-
-}
-
-void yaffs_chunk_del(struct yaffs_dev *dev, int chunk_id, int mark_flash,
-		     int lyn)
-{
-	int block;
-	int page;
-	struct yaffs_ext_tags tags;
-	struct yaffs_block_info *bi;
-
-	if (chunk_id <= 0)
-		return;
-
-	dev->n_deletions++;
-	block = chunk_id / dev->param.chunks_per_block;
-	page = chunk_id % dev->param.chunks_per_block;
-
-	if (!yaffs_check_chunk_bit(dev, block, page))
-		yaffs_trace(YAFFS_TRACE_VERIFY,
-			"Deleting invalid chunk %d", chunk_id);
-
-	bi = yaffs_get_block_info(dev, block);
-
-	yaffs2_update_oldest_dirty_seq(dev, block, bi);
-
-	yaffs_trace(YAFFS_TRACE_DELETION,
-		"line %d delete of chunk %d",
-		lyn, chunk_id);
-
-	if (!dev->param.is_yaffs2 && mark_flash &&
-	    bi->block_state != YAFFS_BLOCK_STATE_COLLECTING) {
-
-		memset(&tags, 0, sizeof(tags));
-		tags.is_deleted = 1;
-		yaffs_wr_chunk_tags_nand(dev, chunk_id, NULL, &tags);
-		yaffs_handle_chunk_update(dev, chunk_id, &tags);
-	} else {
-		dev->n_unmarked_deletions++;
-	}
-
-	/* Pull out of the management area.
-	 * If the whole block became dirty, this will kick off an erasure.
-	 */
-	if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING ||
-	    bi->block_state == YAFFS_BLOCK_STATE_FULL ||
-	    bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN ||
-	    bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
-		dev->n_free_chunks++;
-		yaffs_clear_chunk_bit(dev, block, page);
-		bi->pages_in_use--;
-
-		if (bi->pages_in_use == 0 &&
-		    !bi->has_shrink_hdr &&
-		    bi->block_state != YAFFS_BLOCK_STATE_ALLOCATING &&
-		    bi->block_state != YAFFS_BLOCK_STATE_NEEDS_SCAN) {
-			yaffs_block_became_dirty(dev, block);
-		}
-	}
-}
-
-static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
-			     const u8 *buffer, int n_bytes, int use_reserve)
-{
-	/* Find old chunk Need to do this to get serial number
-	 * Write new one and patch into tree.
-	 * Invalidate old tags.
-	 */
-
-	int prev_chunk_id;
-	struct yaffs_ext_tags prev_tags;
-	int new_chunk_id;
-	struct yaffs_ext_tags new_tags;
-	struct yaffs_dev *dev = in->my_dev;
-
-	yaffs_check_gc(dev, 0);
-
-	/* Get the previous chunk at this location in the file if it exists.
-	 * If it does not exist then put a zero into the tree. This creates
-	 * the tnode now, rather than later when it is harder to clean up.
-	 */
-	prev_chunk_id = yaffs_find_chunk_in_file(in, inode_chunk, &prev_tags);
-	if (prev_chunk_id < 1 &&
-	    !yaffs_put_chunk_in_file(in, inode_chunk, 0, 0))
-		return 0;
-
-	/* Set up new tags */
-	memset(&new_tags, 0, sizeof(new_tags));
-
-	new_tags.chunk_id = inode_chunk;
-	new_tags.obj_id = in->obj_id;
-	new_tags.serial_number =
-	    (prev_chunk_id > 0) ? prev_tags.serial_number + 1 : 1;
-	new_tags.n_bytes = n_bytes;
-
-	if (n_bytes < 1 || n_bytes > dev->param.total_bytes_per_chunk) {
-		yaffs_trace(YAFFS_TRACE_ERROR,
-		  "Writing %d bytes to chunk!!!!!!!!!",
-		   n_bytes);
-		BUG();
-	}
-
-	new_chunk_id =
-	    yaffs_write_new_chunk(dev, buffer, &new_tags, use_reserve);
-
-	if (new_chunk_id > 0) {
-		yaffs_put_chunk_in_file(in, inode_chunk, new_chunk_id, 0);
-
-		if (prev_chunk_id > 0)
-			yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__);
-
-		yaffs_verify_file_sane(in);
-	}
-	return new_chunk_id;
-
-}
-
-
-
-static int yaffs_do_xattrib_mod(struct yaffs_obj *obj, int set,
-				const YCHAR *name, const void *value, int size,
-				int flags)
-{
-	struct yaffs_xattr_mod xmod;
-	int result;
-
-	xmod.set = set;
-	xmod.name = name;
-	xmod.data = value;
-	xmod.size = size;
-	xmod.flags = flags;
-	xmod.result = -ENOSPC;
-
-	result = yaffs_update_oh(obj, NULL, 0, 0, 0, &xmod);
-
-	if (result > 0)
-		return xmod.result;
-	else
-		return -ENOSPC;
-}
-
-static int yaffs_apply_xattrib_mod(struct yaffs_obj *obj, char *buffer,
-				   struct yaffs_xattr_mod *xmod)
-{
-	int retval = 0;
-	int x_offs = sizeof(struct yaffs_obj_hdr);
-	struct yaffs_dev *dev = obj->my_dev;
-	int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
-	char *x_buffer = buffer + x_offs;
-
-	if (xmod->set)
-		retval =
-		    nval_set(x_buffer, x_size, xmod->name, xmod->data,
-			     xmod->size, xmod->flags);
-	else
-		retval = nval_del(x_buffer, x_size, xmod->name);
-
-	obj->has_xattr = nval_hasvalues(x_buffer, x_size);
-	obj->xattr_known = 1;
-	xmod->result = retval;
-
-	return retval;
-}
-
-static int yaffs_do_xattrib_fetch(struct yaffs_obj *obj, const YCHAR *name,
-				  void *value, int size)
-{
-	char *buffer = NULL;
-	int result;
-	struct yaffs_ext_tags tags;
-	struct yaffs_dev *dev = obj->my_dev;
-	int x_offs = sizeof(struct yaffs_obj_hdr);
-	int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
-	char *x_buffer;
-	int retval = 0;
-
-	if (obj->hdr_chunk < 1)
-		return -ENODATA;
-
-	/* If we know that the object has no xattribs then don't do all the
-	 * reading and parsing.
-	 */
-	if (obj->xattr_known && !obj->has_xattr) {
-		if (name)
-			return -ENODATA;
-		else
-			return 0;
-	}
-
-	buffer = (char *)yaffs_get_temp_buffer(dev);
-	if (!buffer)
-		return -ENOMEM;
-
-	result =
-	    yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, (u8 *) buffer, &tags);
-
-	if (result != YAFFS_OK)
-		retval = -ENOENT;
-	else {
-		x_buffer = buffer + x_offs;
-
-		if (!obj->xattr_known) {
-			obj->has_xattr = nval_hasvalues(x_buffer, x_size);
-			obj->xattr_known = 1;
-		}
-
-		if (name)
-			retval = nval_get(x_buffer, x_size, name, value, size);
-		else
-			retval = nval_list(x_buffer, x_size, value, size);
-	}
-	yaffs_release_temp_buffer(dev, (u8 *) buffer);
-	return retval;
-}
-
-int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR * name,
-		      const void *value, int size, int flags)
-{
-	return yaffs_do_xattrib_mod(obj, 1, name, value, size, flags);
-}
-
-int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR * name)
-{
-	return yaffs_do_xattrib_mod(obj, 0, name, NULL, 0, 0);
-}
-
-int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR * name, void *value,
-		      int size)
-{
-	return yaffs_do_xattrib_fetch(obj, name, value, size);
-}
-
-int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size)
-{
-	return yaffs_do_xattrib_fetch(obj, NULL, buffer, size);
-}
-
-static void yaffs_check_obj_details_loaded(struct yaffs_obj *in)
-{
-	u8 *buf;
-	struct yaffs_obj_hdr *oh;
-	struct yaffs_dev *dev;
-	struct yaffs_ext_tags tags;
-	int result;
-	int alloc_failed = 0;
-
-	if (!in || !in->lazy_loaded || in->hdr_chunk < 1)
-		return;
-
-	dev = in->my_dev;
-	in->lazy_loaded = 0;
-	buf = yaffs_get_temp_buffer(dev);
-
-	result = yaffs_rd_chunk_tags_nand(dev, in->hdr_chunk, buf, &tags);
-	oh = (struct yaffs_obj_hdr *)buf;
-
-	in->yst_mode = oh->yst_mode;
-	yaffs_load_attribs(in, oh);
-	yaffs_set_obj_name_from_oh(in, oh);
-
-	if (in->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
-		in->variant.symlink_variant.alias =
-		    yaffs_clone_str(oh->alias);
-		if (!in->variant.symlink_variant.alias)
-			alloc_failed = 1;	/* Not returned */
-	}
-	yaffs_release_temp_buffer(dev, buf);
-}
-
-/* UpdateObjectHeader updates the header on NAND for an object.
- * If name is not NULL, then that new name is used.
- */
-int yaffs_update_oh(struct yaffs_obj *in, const YCHAR *name, int force,
-		    int is_shrink, int shadows, struct yaffs_xattr_mod *xmod)
-{
-
-	struct yaffs_block_info *bi;
-	struct yaffs_dev *dev = in->my_dev;
-	int prev_chunk_id;
-	int ret_val = 0;
-	int result = 0;
-	int new_chunk_id;
-	struct yaffs_ext_tags new_tags;
-	struct yaffs_ext_tags old_tags;
-	const YCHAR *alias = NULL;
-	u8 *buffer = NULL;
-	YCHAR old_name[YAFFS_MAX_NAME_LENGTH + 1];
-	struct yaffs_obj_hdr *oh = NULL;
-	loff_t file_size = 0;
-
-	strcpy(old_name, _Y("silly old name"));
-
-	if (in->fake && in != dev->root_dir && !force && !xmod)
-		return ret_val;
-
-	yaffs_check_gc(dev, 0);
-	yaffs_check_obj_details_loaded(in);
-
-	buffer = yaffs_get_temp_buffer(in->my_dev);
-	oh = (struct yaffs_obj_hdr *)buffer;
-
-	prev_chunk_id = in->hdr_chunk;
-
-	if (prev_chunk_id > 0) {
-		result = yaffs_rd_chunk_tags_nand(dev, prev_chunk_id,
-						  buffer, &old_tags);
-
-		yaffs_verify_oh(in, oh, &old_tags, 0);
-		memcpy(old_name, oh->name, sizeof(oh->name));
-		memset(buffer, 0xff, sizeof(struct yaffs_obj_hdr));
-	} else {
-		memset(buffer, 0xff, dev->data_bytes_per_chunk);
-	}
-
-	oh->type = in->variant_type;
-	oh->yst_mode = in->yst_mode;
-	oh->shadows_obj = oh->inband_shadowed_obj_id = shadows;
-
-	yaffs_load_attribs_oh(oh, in);
-
-	if (in->parent)
-		oh->parent_obj_id = in->parent->obj_id;
-	else
-		oh->parent_obj_id = 0;
-
-	if (name && *name) {
-		memset(oh->name, 0, sizeof(oh->name));
-		yaffs_load_oh_from_name(dev, oh->name, name);
-	} else if (prev_chunk_id > 0) {
-		memcpy(oh->name, old_name, sizeof(oh->name));
-	} else {
-		memset(oh->name, 0, sizeof(oh->name));
-	}
-
-	oh->is_shrink = is_shrink;
-
-	switch (in->variant_type) {
-	case YAFFS_OBJECT_TYPE_UNKNOWN:
-		/* Should not happen */
-		break;
-	case YAFFS_OBJECT_TYPE_FILE:
-		if (oh->parent_obj_id != YAFFS_OBJECTID_DELETED &&
-		    oh->parent_obj_id != YAFFS_OBJECTID_UNLINKED)
-			file_size = in->variant.file_variant.file_size;
-		yaffs_oh_size_load(oh, file_size);
-		break;
-	case YAFFS_OBJECT_TYPE_HARDLINK:
-		oh->equiv_id = in->variant.hardlink_variant.equiv_id;
-		break;
-	case YAFFS_OBJECT_TYPE_SPECIAL:
-		/* Do nothing */
-		break;
-	case YAFFS_OBJECT_TYPE_DIRECTORY:
-		/* Do nothing */
-		break;
-	case YAFFS_OBJECT_TYPE_SYMLINK:
-		alias = in->variant.symlink_variant.alias;
-		if (!alias)
-			alias = _Y("no alias");
-		strncpy(oh->alias, alias, YAFFS_MAX_ALIAS_LENGTH);
-		oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
-		break;
-	}
-
-	/* process any xattrib modifications */
-	if (xmod)
-		yaffs_apply_xattrib_mod(in, (char *)buffer, xmod);
-
-	/* Tags */
-	memset(&new_tags, 0, sizeof(new_tags));
-	in->serial++;
-	new_tags.chunk_id = 0;
-	new_tags.obj_id = in->obj_id;
-	new_tags.serial_number = in->serial;
-
-	/* Add extra info for file header */
-	new_tags.extra_available = 1;
-	new_tags.extra_parent_id = oh->parent_obj_id;
-	new_tags.extra_file_size = file_size;
-	new_tags.extra_is_shrink = oh->is_shrink;
-	new_tags.extra_equiv_id = oh->equiv_id;
-	new_tags.extra_shadows = (oh->shadows_obj > 0) ? 1 : 0;
-	new_tags.extra_obj_type = in->variant_type;
-	yaffs_verify_oh(in, oh, &new_tags, 1);
-
-	/* Create new chunk in NAND */
-	new_chunk_id =
-	    yaffs_write_new_chunk(dev, buffer, &new_tags,
-				  (prev_chunk_id > 0) ? 1 : 0);
-
-	if (buffer)
-		yaffs_release_temp_buffer(dev, buffer);
-
-	if (new_chunk_id < 0)
-		return new_chunk_id;
-
-	in->hdr_chunk = new_chunk_id;
-
-	if (prev_chunk_id > 0)
-		yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__);
-
-	if (!yaffs_obj_cache_dirty(in))
-		in->dirty = 0;
-
-	/* If this was a shrink, then mark the block
-	 * that the chunk lives on */
-	if (is_shrink) {
-		bi = yaffs_get_block_info(in->my_dev,
-					  new_chunk_id /
-					  in->my_dev->param.chunks_per_block);
-		bi->has_shrink_hdr = 1;
-	}
-
-
-	return new_chunk_id;
-}
-
-/*--------------------- File read/write ------------------------
- * Read and write have very similar structures.
- * In general the read/write has three parts to it
- * An incomplete chunk to start with (if the read/write is not chunk-aligned)
- * Some complete chunks
- * An incomplete chunk to end off with
- *
- * Curve-balls: the first chunk might also be the last chunk.
- */
-
-int yaffs_file_rd(struct yaffs_obj *in, u8 * buffer, loff_t offset, int n_bytes)
-{
-	int chunk;
-	u32 start;
-	int n_copy;
-	int n = n_bytes;
-	int n_done = 0;
-	struct yaffs_cache *cache;
-	struct yaffs_dev *dev;
-
-	dev = in->my_dev;
-
-	while (n > 0) {
-		yaffs_addr_to_chunk(dev, offset, &chunk, &start);
-		chunk++;
-
-		/* OK now check for the curveball where the start and end are in
-		 * the same chunk.
-		 */
-		if ((start + n) < dev->data_bytes_per_chunk)
-			n_copy = n;
-		else
-			n_copy = dev->data_bytes_per_chunk - start;
-
-		cache = yaffs_find_chunk_cache(in, chunk);
-
-		/* If the chunk is already in the cache or it is less than
-		 * a whole chunk or we're using inband tags then use the cache
-		 * (if there is caching) else bypass the cache.
-		 */
-		if (cache || n_copy != dev->data_bytes_per_chunk ||
-		    dev->param.inband_tags) {
-			if (dev->param.n_caches > 0) {
-
-				/* If we can't find the data in the cache,
-				 * then load it up. */
-
-				if (!cache) {
-					cache =
-					    yaffs_grab_chunk_cache(in->my_dev);
-					cache->object = in;
-					cache->chunk_id = chunk;
-					cache->dirty = 0;
-					cache->locked = 0;
-					yaffs_rd_data_obj(in, chunk,
-							  cache->data);
-					cache->n_bytes = 0;
-				}
-
-				yaffs_use_cache(dev, cache, 0);
-
-				cache->locked = 1;
-
-				memcpy(buffer, &cache->data[start], n_copy);
-
-				cache->locked = 0;
-			} else {
-				/* Read into the local buffer then copy.. */
-
-				u8 *local_buffer =
-				    yaffs_get_temp_buffer(dev);
-				yaffs_rd_data_obj(in, chunk, local_buffer);
-
-				memcpy(buffer, &local_buffer[start], n_copy);
-
-				yaffs_release_temp_buffer(dev, local_buffer);
-			}
-		} else {
-			/* A full chunk. Read directly into the buffer. */
-			yaffs_rd_data_obj(in, chunk, buffer);
-		}
-		n -= n_copy;
-		offset += n_copy;
-		buffer += n_copy;
-		n_done += n_copy;
-	}
-	return n_done;
-}
-
-int yaffs_do_file_wr(struct yaffs_obj *in, const u8 *buffer, loff_t offset,
-		     int n_bytes, int write_through)
-{
-
-	int chunk;
-	u32 start;
-	int n_copy;
-	int n = n_bytes;
-	int n_done = 0;
-	int n_writeback;
-	loff_t start_write = offset;
-	int chunk_written = 0;
-	u32 n_bytes_read;
-	loff_t chunk_start;
-	struct yaffs_dev *dev;
-
-	dev = in->my_dev;
-
-	while (n > 0 && chunk_written >= 0) {
-		yaffs_addr_to_chunk(dev, offset, &chunk, &start);
-
-		if (((loff_t)chunk) *
-		    dev->data_bytes_per_chunk + start != offset ||
-		    start >= dev->data_bytes_per_chunk) {
-			yaffs_trace(YAFFS_TRACE_ERROR,
-				"AddrToChunk of offset %lld gives chunk %d start %d",
-				offset, chunk, start);
-		}
-		chunk++;	/* File pos to chunk in file offset */
-
-		/* OK now check for the curveball where the start and end are in
-		 * the same chunk.
-		 */
-
-		if ((start + n) < dev->data_bytes_per_chunk) {
-			n_copy = n;
-
-			/* Now calculate how many bytes to write back....
-			 * If we're overwriting and not writing to then end of
-			 * file then we need to write back as much as was there
-			 * before.
-			 */
-
-			chunk_start = (((loff_t)(chunk - 1)) *
-					dev->data_bytes_per_chunk);
-
-			if (chunk_start > in->variant.file_variant.file_size)
-				n_bytes_read = 0;	/* Past end of file */
-			else
-				n_bytes_read =
-				    in->variant.file_variant.file_size -
-				    chunk_start;
-
-			if (n_bytes_read > dev->data_bytes_per_chunk)
-				n_bytes_read = dev->data_bytes_per_chunk;
-
-			n_writeback =
-			    (n_bytes_read >
-			     (start + n)) ? n_bytes_read : (start + n);
-
-			if (n_writeback < 0 ||
-			    n_writeback > dev->data_bytes_per_chunk)
-				BUG();
-
-		} else {
-			n_copy = dev->data_bytes_per_chunk - start;
-			n_writeback = dev->data_bytes_per_chunk;
-		}
-
-		if (n_copy != dev->data_bytes_per_chunk ||
-		    !dev->param.cache_bypass_aligned ||
-		    dev->param.inband_tags) {
-			/* An incomplete start or end chunk (or maybe both
-			 * start and end chunk), or we're using inband tags,
-			 * or we're forcing writes through the cache,
-			 * so we want to use the cache buffers.
-			 */
-			if (dev->param.n_caches > 0) {
-				struct yaffs_cache *cache;
-
-				/* If we can't find the data in the cache, then
-				 * load the cache */
-				cache = yaffs_find_chunk_cache(in, chunk);
-
-				if (!cache &&
-				    yaffs_check_alloc_available(dev, 1)) {
-					cache = yaffs_grab_chunk_cache(dev);
-					cache->object = in;
-					cache->chunk_id = chunk;
-					cache->dirty = 0;
-					cache->locked = 0;
-					yaffs_rd_data_obj(in, chunk,
-							  cache->data);
-				} else if (cache &&
-					   !cache->dirty &&
-					   !yaffs_check_alloc_available(dev,
-									1)) {
-					/* Drop the cache if it was a read cache
-					 * item and no space check has been made
-					 * for it.
-					 */
-					cache = NULL;
-				}
-
-				if (cache) {
-					yaffs_use_cache(dev, cache, 1);
-					cache->locked = 1;
-
-					memcpy(&cache->data[start], buffer,
-					       n_copy);
-
-					cache->locked = 0;
-					cache->n_bytes = n_writeback;
-
-					if (write_through) {
-						chunk_written =
-						    yaffs_wr_data_obj
-						    (cache->object,
-						     cache->chunk_id,
-						     cache->data,
-						     cache->n_bytes, 1);
-						cache->dirty = 0;
-					}
-				} else {
-					chunk_written = -1;	/* fail write */
-				}
-			} else {
-				/* An incomplete start or end chunk (or maybe
-				 * both start and end chunk). Read into the
-				 * local buffer then copy over and write back.
-				 */
-
-				u8 *local_buffer = yaffs_get_temp_buffer(dev);
-
-				yaffs_rd_data_obj(in, chunk, local_buffer);
-				memcpy(&local_buffer[start], buffer, n_copy);
-
-				chunk_written =
-				    yaffs_wr_data_obj(in, chunk,
-						      local_buffer,
-						      n_writeback, 0);
-
-				yaffs_release_temp_buffer(dev, local_buffer);
-			}
-		} else {
-			/* A full chunk. Write directly from the buffer. */
-
-			chunk_written =
-			    yaffs_wr_data_obj(in, chunk, buffer,
-					      dev->data_bytes_per_chunk, 0);
-
-			/* Since we've overwritten the cached data,
-			 * we better invalidate it. */
-			yaffs_invalidate_chunk_cache(in, chunk);
-		}
-
-		if (chunk_written >= 0) {
-			n -= n_copy;
-			offset += n_copy;
-			buffer += n_copy;
-			n_done += n_copy;
-		}
-	}
-
-	/* Update file object */
-
-	if ((start_write + n_done) > in->variant.file_variant.file_size)
-		in->variant.file_variant.file_size = (start_write + n_done);
-
-	in->dirty = 1;
-	return n_done;
-}
-
-int yaffs_wr_file(struct yaffs_obj *in, const u8 *buffer, loff_t offset,
-		  int n_bytes, int write_through)
-{
-	yaffs2_handle_hole(in, offset);
-	return yaffs_do_file_wr(in, buffer, offset, n_bytes, write_through);
-}
-
-/* ---------------------- File resizing stuff ------------------ */
-
-static void yaffs_prune_chunks(struct yaffs_obj *in, loff_t new_size)
-{
-
-	struct yaffs_dev *dev = in->my_dev;
-	loff_t old_size = in->variant.file_variant.file_size;
-	int i;
-	int chunk_id;
-	u32 dummy;
-	int last_del;
-	int start_del;
-
-	if (old_size > 0)
-		yaffs_addr_to_chunk(dev, old_size - 1, &last_del, &dummy);
-	else
-		last_del = 0;
-
-	yaffs_addr_to_chunk(dev, new_size + dev->data_bytes_per_chunk - 1,
-				&start_del, &dummy);
-	last_del++;
-	start_del++;
-
-	/* Delete backwards so that we don't end up with holes if
-	 * power is lost part-way through the operation.
-	 */
-	for (i = last_del; i >= start_del; i--) {
-		/* NB this could be optimised somewhat,
-		 * eg. could retrieve the tags and write them without
-		 * using yaffs_chunk_del
-		 */
-
-		chunk_id = yaffs_find_del_file_chunk(in, i, NULL);
-
-		if (chunk_id < 1)
-			continue;
-
-		if (chunk_id <
-		    (dev->internal_start_block * dev->param.chunks_per_block) ||
-		    chunk_id >=
-		    ((dev->internal_end_block + 1) *
-		      dev->param.chunks_per_block)) {
-			yaffs_trace(YAFFS_TRACE_ALWAYS,
-				"Found daft chunk_id %d for %d",
-				chunk_id, i);
-		} else {
-			in->n_data_chunks--;
-			yaffs_chunk_del(dev, chunk_id, 1, __LINE__);
-		}
-	}
-}
-
-void yaffs_resize_file_down(struct yaffs_obj *obj, loff_t new_size)
-{
-	int new_full;
-	u32 new_partial;
-	struct yaffs_dev *dev = obj->my_dev;
-
-	yaffs_addr_to_chunk(dev, new_size, &new_full, &new_partial);
-
-	yaffs_prune_chunks(obj, new_size);
-
-	if (new_partial != 0) {
-		int last_chunk = 1 + new_full;
-		u8 *local_buffer = yaffs_get_temp_buffer(dev);
-
-		/* Rewrite the last chunk with its new size and zero pad */
-		yaffs_rd_data_obj(obj, last_chunk, local_buffer);
-		memset(local_buffer + new_partial, 0,
-		       dev->data_bytes_per_chunk - new_partial);
-
-		yaffs_wr_data_obj(obj, last_chunk, local_buffer,
-				  new_partial, 1);
-
-		yaffs_release_temp_buffer(dev, local_buffer);
-	}
-
-	obj->variant.file_variant.file_size = new_size;
-
-	yaffs_prune_tree(dev, &obj->variant.file_variant);
-}
-
-int yaffs_resize_file(struct yaffs_obj *in, loff_t new_size)
-{
-	struct yaffs_dev *dev = in->my_dev;
-	loff_t old_size = in->variant.file_variant.file_size;
-
-	yaffs_flush_file_cache(in, 1);
-	yaffs_invalidate_whole_cache(in);
-
-	yaffs_check_gc(dev, 0);
-
-	if (in->variant_type != YAFFS_OBJECT_TYPE_FILE)
-		return YAFFS_FAIL;
-
-	if (new_size == old_size)
-		return YAFFS_OK;
-
-	if (new_size > old_size) {
-		yaffs2_handle_hole(in, new_size);
-		in->variant.file_variant.file_size = new_size;
-	} else {
-		/* new_size < old_size */
-		yaffs_resize_file_down(in, new_size);
-	}
-
-	/* Write a new object header to reflect the resize.
-	 * show we've shrunk the file, if need be
-	 * Do this only if the file is not in the deleted directories
-	 * and is not shadowed.
-	 */
-	if (in->parent &&
-	    !in->is_shadowed &&
-	    in->parent->obj_id != YAFFS_OBJECTID_UNLINKED &&
-	    in->parent->obj_id != YAFFS_OBJECTID_DELETED)
-		yaffs_update_oh(in, NULL, 0, 0, 0, NULL);
-
-	return YAFFS_OK;
-}
-
-int yaffs_flush_file(struct yaffs_obj *in,
-		     int update_time,
-		     int data_sync,
-		     int discard_cache)
-{
-	if (!in->dirty)
-		return YAFFS_OK;
-
-	yaffs_flush_file_cache(in, discard_cache);
-
-	if (data_sync)
-		return YAFFS_OK;
-
-	if (update_time)
-		yaffs_load_current_time(in, 0, 0);
-
-	return (yaffs_update_oh(in, NULL, 0, 0, 0, NULL) >= 0) ?
-				YAFFS_OK : YAFFS_FAIL;
-}
-
-
-/* yaffs_del_file deletes the whole file data
- * and the inode associated with the file.
- * It does not delete the links associated with the file.
- */
-static int yaffs_unlink_file_if_needed(struct yaffs_obj *in)
-{
-	int ret_val;
-	int del_now = 0;
-	struct yaffs_dev *dev = in->my_dev;
-
-	if (!in->my_inode)
-		del_now = 1;
-
-	if (del_now) {
-		ret_val =
-		    yaffs_change_obj_name(in, in->my_dev->del_dir,
-					  _Y("deleted"), 0, 0);
-		yaffs_trace(YAFFS_TRACE_TRACING,
-			"yaffs: immediate deletion of file %d",
-			in->obj_id);
-		in->deleted = 1;
-		in->my_dev->n_deleted_files++;
-		if (dev->param.disable_soft_del || dev->param.is_yaffs2)
-			yaffs_resize_file(in, 0);
-		yaffs_soft_del_file(in);
-	} else {
-		ret_val =
-		    yaffs_change_obj_name(in, in->my_dev->unlinked_dir,
-					  _Y("unlinked"), 0, 0);
-	}
-	return ret_val;
-}
-
-static int yaffs_del_file(struct yaffs_obj *in)
-{
-	int ret_val = YAFFS_OK;
-	int deleted;	/* Need to cache value on stack if in is freed */
-	struct yaffs_dev *dev = in->my_dev;
-
-	if (dev->param.disable_soft_del || dev->param.is_yaffs2)
-		yaffs_resize_file(in, 0);
-
-	if (in->n_data_chunks > 0) {
-		/* Use soft deletion if there is data in the file.
-		 * That won't be the case if it has been resized to zero.
-		 */
-		if (!in->unlinked)
-			ret_val = yaffs_unlink_file_if_needed(in);
-
-		deleted = in->deleted;
-
-		if (ret_val == YAFFS_OK && in->unlinked && !in->deleted) {
-			in->deleted = 1;
-			deleted = 1;
-			in->my_dev->n_deleted_files++;
-			yaffs_soft_del_file(in);
-		}
-		return deleted ? YAFFS_OK : YAFFS_FAIL;
-	} else {
-		/* The file has no data chunks so we toss it immediately */
-		yaffs_free_tnode(in->my_dev, in->variant.file_variant.top);
-		in->variant.file_variant.top = NULL;
-		yaffs_generic_obj_del(in);
-
-		return YAFFS_OK;
-	}
-}
-
-int yaffs_is_non_empty_dir(struct yaffs_obj *obj)
-{
-	return (obj &&
-		obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) &&
-		!(list_empty(&obj->variant.dir_variant.children));
-}
-
-static int yaffs_del_dir(struct yaffs_obj *obj)
-{
-	/* First check that the directory is empty. */
-	if (yaffs_is_non_empty_dir(obj))
-		return YAFFS_FAIL;
-
-	return yaffs_generic_obj_del(obj);
-}
-
-static int yaffs_del_symlink(struct yaffs_obj *in)
-{
-	kfree(in->variant.symlink_variant.alias);
-	in->variant.symlink_variant.alias = NULL;
-
-	return yaffs_generic_obj_del(in);
-}
-
-static int yaffs_del_link(struct yaffs_obj *in)
-{
-	/* remove this hardlink from the list associated with the equivalent
-	 * object
-	 */
-	list_del_init(&in->hard_links);
-	return yaffs_generic_obj_del(in);
-}
-
-int yaffs_del_obj(struct yaffs_obj *obj)
-{
-	int ret_val = -1;
-
-	switch (obj->variant_type) {
-	case YAFFS_OBJECT_TYPE_FILE:
-		ret_val = yaffs_del_file(obj);
-		break;
-	case YAFFS_OBJECT_TYPE_DIRECTORY:
-		if (!list_empty(&obj->variant.dir_variant.dirty)) {
-			yaffs_trace(YAFFS_TRACE_BACKGROUND,
-				"Remove object %d from dirty directories",
-				obj->obj_id);
-			list_del_init(&obj->variant.dir_variant.dirty);
-		}
-		return yaffs_del_dir(obj);
-		break;
-	case YAFFS_OBJECT_TYPE_SYMLINK:
-		ret_val = yaffs_del_symlink(obj);
-		break;
-	case YAFFS_OBJECT_TYPE_HARDLINK:
-		ret_val = yaffs_del_link(obj);
-		break;
-	case YAFFS_OBJECT_TYPE_SPECIAL:
-		ret_val = yaffs_generic_obj_del(obj);
-		break;
-	case YAFFS_OBJECT_TYPE_UNKNOWN:
-		ret_val = 0;
-		break;		/* should not happen. */
-	}
-	return ret_val;
-}
-
-
-static void yaffs_empty_dir_to_dir(struct yaffs_obj *from_dir,
-				   struct yaffs_obj *to_dir)
-{
-	struct yaffs_obj *obj;
-	struct list_head *lh;
-	struct list_head *n;
-
-	list_for_each_safe(lh, n, &from_dir->variant.dir_variant.children) {
-		obj = list_entry(lh, struct yaffs_obj, siblings);
-		yaffs_add_obj_to_dir(to_dir, obj);
-	}
-}
-
-struct yaffs_obj *yaffs_retype_obj(struct yaffs_obj *obj,
-				   enum yaffs_obj_type type)
-{
-	/* Tear down the old variant */
-	switch (obj->variant_type) {
-	case YAFFS_OBJECT_TYPE_FILE:
-		/* Nuke file data */
-		yaffs_resize_file(obj, 0);
-		yaffs_free_tnode(obj->my_dev, obj->variant.file_variant.top);
-		obj->variant.file_variant.top = NULL;
-		break;
-	case YAFFS_OBJECT_TYPE_DIRECTORY:
-		/* Put the children in lost and found. */
-		yaffs_empty_dir_to_dir(obj, obj->my_dev->lost_n_found);
-		if (!list_empty(&obj->variant.dir_variant.dirty))
-			list_del_init(&obj->variant.dir_variant.dirty);
-		break;
-	case YAFFS_OBJECT_TYPE_SYMLINK:
-		/* Nuke symplink data */
-		kfree(obj->variant.symlink_variant.alias);
-		obj->variant.symlink_variant.alias = NULL;
-		break;
-	case YAFFS_OBJECT_TYPE_HARDLINK:
-		list_del_init(&obj->hard_links);
-		break;
-	default:
-		break;
-	}
-
-	memset(&obj->variant, 0, sizeof(obj->variant));
-
-	/*Set up new variant if the memset is not enough. */
-	switch (type) {
-	case YAFFS_OBJECT_TYPE_DIRECTORY:
-		INIT_LIST_HEAD(&obj->variant.dir_variant.children);
-		INIT_LIST_HEAD(&obj->variant.dir_variant.dirty);
-		break;
-	case YAFFS_OBJECT_TYPE_FILE:
-	case YAFFS_OBJECT_TYPE_SYMLINK:
-	case YAFFS_OBJECT_TYPE_HARDLINK:
-	default:
-		break;
-	}
-
-	obj->variant_type = type;
-
-	return obj;
-
-}
-
-static int yaffs_unlink_worker(struct yaffs_obj *obj)
-{
-	int del_now = 0;
-
-	if (!obj)
-		return YAFFS_FAIL;
-
-	if (!obj->my_inode)
-		del_now = 1;
-
-	yaffs_update_parent(obj->parent);
-
-	if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
-		return yaffs_del_link(obj);
-	} else if (!list_empty(&obj->hard_links)) {
-		/* Curve ball: We're unlinking an object that has a hardlink.
-		 *
-		 * This problem arises because we are not strictly following
-		 * The Linux link/inode model.
-		 *
-		 * We can't really delete the object.
-		 * Instead, we do the following:
-		 * - Select a hardlink.
-		 * - Unhook it from the hard links
-		 * - Move it from its parent directory so that the rename works.
-		 * - Rename the object to the hardlink's name.
-		 * - Delete the hardlink
-		 */
-
-		struct yaffs_obj *hl;
-		struct yaffs_obj *parent;
-		int ret_val;
-		YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
-
-		hl = list_entry(obj->hard_links.next, struct yaffs_obj,
-				hard_links);
-
-		yaffs_get_obj_name(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
-		parent = hl->parent;
-
-		list_del_init(&hl->hard_links);
-
-		yaffs_add_obj_to_dir(obj->my_dev->unlinked_dir, hl);
-
-		ret_val = yaffs_change_obj_name(obj, parent, name, 0, 0);
-
-		if (ret_val == YAFFS_OK)
-			ret_val = yaffs_generic_obj_del(hl);
-
-		return ret_val;
-
-	} else if (del_now) {
-		switch (obj->variant_type) {
-		case YAFFS_OBJECT_TYPE_FILE:
-			return yaffs_del_file(obj);
-			break;
-		case YAFFS_OBJECT_TYPE_DIRECTORY:
-			list_del_init(&obj->variant.dir_variant.dirty);
-			return yaffs_del_dir(obj);
-			break;
-		case YAFFS_OBJECT_TYPE_SYMLINK:
-			return yaffs_del_symlink(obj);
-			break;
-		case YAFFS_OBJECT_TYPE_SPECIAL:
-			return yaffs_generic_obj_del(obj);
-			break;
-		case YAFFS_OBJECT_TYPE_HARDLINK:
-		case YAFFS_OBJECT_TYPE_UNKNOWN:
-		default:
-			return YAFFS_FAIL;
-		}
-	} else if (yaffs_is_non_empty_dir(obj)) {
-		return YAFFS_FAIL;
-	} else {
-		return yaffs_change_obj_name(obj, obj->my_dev->unlinked_dir,
-						_Y("unlinked"), 0, 0);
-	}
-}
-
-static int yaffs_unlink_obj(struct yaffs_obj *obj)
-{
-	if (obj && obj->unlink_allowed)
-		return yaffs_unlink_worker(obj);
-
-	return YAFFS_FAIL;
-}
-
-int yaffs_unlinker(struct yaffs_obj *dir, const YCHAR *name)
-{
-	struct yaffs_obj *obj;
-
-	obj = yaffs_find_by_name(dir, name);
-	return yaffs_unlink_obj(obj);
-}
-
-/* Note:
- * If old_name is NULL then we take old_dir as the object to be renamed.
- */
-int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR *old_name,
-		     struct yaffs_obj *new_dir, const YCHAR *new_name)
-{
-	struct yaffs_obj *obj = NULL;
-	struct yaffs_obj *existing_target = NULL;
-	int force = 0;
-	int result;
-	struct yaffs_dev *dev;
-
-	if (!old_dir || old_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
-		BUG();
-		return YAFFS_FAIL;
-	}
-	if (!new_dir || new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
-		BUG();
-		return YAFFS_FAIL;
-	}
-
-	dev = old_dir->my_dev;
-
-#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
-	/* Special case for case insemsitive systems.
-	 * While look-up is case insensitive, the name isn't.
-	 * Therefore we might want to change x.txt to X.txt
-	 */
-	if (old_dir == new_dir &&
-		old_name && new_name &&
-		strcmp(old_name, new_name) == 0)
-		force = 1;
-#endif
-
-	if (strnlen(new_name, YAFFS_MAX_NAME_LENGTH + 1) >
-	    YAFFS_MAX_NAME_LENGTH)
-		/* ENAMETOOLONG */
-		return YAFFS_FAIL;
-
-	if (old_name)
-		obj = yaffs_find_by_name(old_dir, old_name);
-	else{
-		obj = old_dir;
-		old_dir = obj->parent;
-	}
-
-	if (obj && obj->rename_allowed) {
-		/* Now handle an existing target, if there is one */
-		existing_target = yaffs_find_by_name(new_dir, new_name);
-		if (yaffs_is_non_empty_dir(existing_target)) {
-			return YAFFS_FAIL;	/* ENOTEMPTY */
-		} else if (existing_target && existing_target != obj) {
-			/* Nuke the target first, using shadowing,
-			 * but only if it isn't the same object.
-			 *
-			 * Note we must disable gc here otherwise it can mess
-			 * up the shadowing.
-			 *
-			 */
-			dev->gc_disable = 1;
-			yaffs_change_obj_name(obj, new_dir, new_name, force,
-					      existing_target->obj_id);
-			existing_target->is_shadowed = 1;
-			yaffs_unlink_obj(existing_target);
-			dev->gc_disable = 0;
-		}
-
-		result = yaffs_change_obj_name(obj, new_dir, new_name, 1, 0);
-
-		yaffs_update_parent(old_dir);
-		if (new_dir != old_dir)
-			yaffs_update_parent(new_dir);
-
-		return result;
-	}
-	return YAFFS_FAIL;
-}
-
-/*----------------------- Initialisation Scanning ---------------------- */
-
-void yaffs_handle_shadowed_obj(struct yaffs_dev *dev, int obj_id,
-			       int backward_scanning)
-{
-	struct yaffs_obj *obj;
-
-	if (backward_scanning) {
-		/* Handle YAFFS2 case (backward scanning)
-		 * If the shadowed object exists then ignore.
-		 */
-		obj = yaffs_find_by_number(dev, obj_id);
-		if (obj)
-			return;
-	}
-
-	/* Let's create it (if it does not exist) assuming it is a file so that
-	 * it can do shrinking etc.
-	 * We put it in unlinked dir to be cleaned up after the scanning
-	 */
-	obj =
-	    yaffs_find_or_create_by_number(dev, obj_id, YAFFS_OBJECT_TYPE_FILE);
-	if (!obj)
-		return;
-	obj->is_shadowed = 1;
-	yaffs_add_obj_to_dir(dev->unlinked_dir, obj);
-	obj->variant.file_variant.shrink_size = 0;
-	obj->valid = 1;		/* So that we don't read any other info. */
-}
-
-void yaffs_link_fixup(struct yaffs_dev *dev, struct list_head *hard_list)
-{
-	struct list_head *lh;
-	struct list_head *save;
-	struct yaffs_obj *hl;
-	struct yaffs_obj *in;
-
-	list_for_each_safe(lh, save, hard_list) {
-		hl = list_entry(lh, struct yaffs_obj, hard_links);
-		in = yaffs_find_by_number(dev,
-					hl->variant.hardlink_variant.equiv_id);
-
-		if (in) {
-			/* Add the hardlink pointers */
-			hl->variant.hardlink_variant.equiv_obj = in;
-			list_add(&hl->hard_links, &in->hard_links);
-		} else {
-			/* Todo Need to report/handle this better.
-			 * Got a problem... hardlink to a non-existant object
-			 */
-			hl->variant.hardlink_variant.equiv_obj = NULL;
-			INIT_LIST_HEAD(&hl->hard_links);
-		}
-	}
-}
-
-static void yaffs_strip_deleted_objs(struct yaffs_dev *dev)
-{
-	/*
-	 *  Sort out state of unlinked and deleted objects after scanning.
-	 */
-	struct list_head *i;
-	struct list_head *n;
-	struct yaffs_obj *l;
-
-	if (dev->read_only)
-		return;
-
-	/* Soft delete all the unlinked files */
-	list_for_each_safe(i, n,
-			   &dev->unlinked_dir->variant.dir_variant.children) {
-		l = list_entry(i, struct yaffs_obj, siblings);
-		yaffs_del_obj(l);
-	}
-
-	list_for_each_safe(i, n, &dev->del_dir->variant.dir_variant.children) {
-		l = list_entry(i, struct yaffs_obj, siblings);
-		yaffs_del_obj(l);
-	}
-}
-
-/*
- * This code iterates through all the objects making sure that they are rooted.
- * Any unrooted objects are re-rooted in lost+found.
- * An object needs to be in one of:
- * - Directly under deleted, unlinked
- * - Directly or indirectly under root.
- *
- * Note:
- *  This code assumes that we don't ever change the current relationships
- *  between directories:
- *   root_dir->parent == unlinked_dir->parent == del_dir->parent == NULL
- *   lost-n-found->parent == root_dir
- *
- * This fixes the problem where directories might have inadvertently been
- * deleted leaving the object "hanging" without being rooted in the
- * directory tree.
- */
-
-static int yaffs_has_null_parent(struct yaffs_dev *dev, struct yaffs_obj *obj)
-{
-	return (obj == dev->del_dir ||
-		obj == dev->unlinked_dir || obj == dev->root_dir);
-}
-
-static void yaffs_fix_hanging_objs(struct yaffs_dev *dev)
-{
-	struct yaffs_obj *obj;
-	struct yaffs_obj *parent;
-	int i;
-	struct list_head *lh;
-	struct list_head *n;
-	int depth_limit;
-	int hanging;
-
-	if (dev->read_only)
-		return;
-
-	/* Iterate through the objects in each hash entry,
-	 * looking at each object.
-	 * Make sure it is rooted.
-	 */
-
-	for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
-		list_for_each_safe(lh, n, &dev->obj_bucket[i].list) {
-			obj = list_entry(lh, struct yaffs_obj, hash_link);
-			parent = obj->parent;
-
-			if (yaffs_has_null_parent(dev, obj)) {
-				/* These directories are not hanging */
-				hanging = 0;
-			} else if (!parent ||
-				   parent->variant_type !=
-				   YAFFS_OBJECT_TYPE_DIRECTORY) {
-				hanging = 1;
-			} else if (yaffs_has_null_parent(dev, parent)) {
-				hanging = 0;
-			} else {
-				/*
-				 * Need to follow the parent chain to
-				 * see if it is hanging.
-				 */
-				hanging = 0;
-				depth_limit = 100;
-
-				while (parent != dev->root_dir &&
-				       parent->parent &&
-				       parent->parent->variant_type ==
-				       YAFFS_OBJECT_TYPE_DIRECTORY &&
-				       depth_limit > 0) {
-					parent = parent->parent;
-					depth_limit--;
-				}
-				if (parent != dev->root_dir)
-					hanging = 1;
-			}
-			if (hanging) {
-				yaffs_trace(YAFFS_TRACE_SCAN,
-					"Hanging object %d moved to lost and found",
-					obj->obj_id);
-				yaffs_add_obj_to_dir(dev->lost_n_found, obj);
-			}
-		}
-	}
-}
-
-/*
- * Delete directory contents for cleaning up lost and found.
- */
-static void yaffs_del_dir_contents(struct yaffs_obj *dir)
-{
-	struct yaffs_obj *obj;
-	struct list_head *lh;
-	struct list_head *n;
-
-	if (dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
-		BUG();
-
-	list_for_each_safe(lh, n, &dir->variant.dir_variant.children) {
-		obj = list_entry(lh, struct yaffs_obj, siblings);
-		if (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
-			yaffs_del_dir_contents(obj);
-		yaffs_trace(YAFFS_TRACE_SCAN,
-			"Deleting lost_found object %d",
-			obj->obj_id);
-		yaffs_unlink_obj(obj);
-	}
-}
-
-static void yaffs_empty_l_n_f(struct yaffs_dev *dev)
-{
-	yaffs_del_dir_contents(dev->lost_n_found);
-}
-
-
-struct yaffs_obj *yaffs_find_by_name(struct yaffs_obj *directory,
-				     const YCHAR *name)
-{
-	int sum;
-	struct list_head *i;
-	YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
-	struct yaffs_obj *l;
-
-	if (!name)
-		return NULL;
-
-	if (!directory) {
-		yaffs_trace(YAFFS_TRACE_ALWAYS,
-			"tragedy: yaffs_find_by_name: null pointer directory"
-			);
-		BUG();
-		return NULL;
-	}
-	if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
-		yaffs_trace(YAFFS_TRACE_ALWAYS,
-			"tragedy: yaffs_find_by_name: non-directory"
-			);
-		BUG();
-	}
-
-	sum = yaffs_calc_name_sum(name);
-
-	list_for_each(i, &directory->variant.dir_variant.children) {
-		l = list_entry(i, struct yaffs_obj, siblings);
-
-		if (l->parent != directory)
-			BUG();
-
-		yaffs_check_obj_details_loaded(l);
-
-		/* Special case for lost-n-found */
-		if (l->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
-			if (!strcmp(name, YAFFS_LOSTNFOUND_NAME))
-				return l;
-		} else if (l->sum == sum || l->hdr_chunk <= 0) {
-			/* LostnFound chunk called Objxxx
-			 * Do a real check
-			 */
-			yaffs_get_obj_name(l, buffer,
-				YAFFS_MAX_NAME_LENGTH + 1);
-			if (!strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH))
-				return l;
-		}
-	}
-	return NULL;
-}
-
-/* GetEquivalentObject dereferences any hard links to get to the
- * actual object.
- */
-
-struct yaffs_obj *yaffs_get_equivalent_obj(struct yaffs_obj *obj)
-{
-	if (obj && obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
-		obj = obj->variant.hardlink_variant.equiv_obj;
-		yaffs_check_obj_details_loaded(obj);
-	}
-	return obj;
-}
-
-/*
- *  A note or two on object names.
- *  * If the object name is missing, we then make one up in the form objnnn
- *
- *  * ASCII names are stored in the object header's name field from byte zero
- *  * Unicode names are historically stored starting from byte zero.
- *
- * Then there are automatic Unicode names...
- * The purpose of these is to save names in a way that can be read as
- * ASCII or Unicode names as appropriate, thus allowing a Unicode and ASCII
- * system to share files.
- *
- * These automatic unicode are stored slightly differently...
- *  - If the name can fit in the ASCII character space then they are saved as
- *    ascii names as per above.
- *  - If the name needs Unicode then the name is saved in Unicode
- *    starting at oh->name[1].
-
- */
-static void yaffs_fix_null_name(struct yaffs_obj *obj, YCHAR *name,
-				int buffer_size)
-{
-	/* Create an object name if we could not find one. */
-	if (strnlen(name, YAFFS_MAX_NAME_LENGTH) == 0) {
-		YCHAR local_name[20];
-		YCHAR num_string[20];
-		YCHAR *x = &num_string[19];
-		unsigned v = obj->obj_id;
-		num_string[19] = 0;
-		while (v > 0) {
-			x--;
-			*x = '0' + (v % 10);
-			v /= 10;
-		}
-		/* make up a name */
-		strcpy(local_name, YAFFS_LOSTNFOUND_PREFIX);
-		strcat(local_name, x);
-		strncpy(name, local_name, buffer_size - 1);
-	}
-}
-
-int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR *name, int buffer_size)
-{
-	memset(name, 0, buffer_size * sizeof(YCHAR));
-	yaffs_check_obj_details_loaded(obj);
-	if (obj->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
-		strncpy(name, YAFFS_LOSTNFOUND_NAME, buffer_size - 1);
-	} else if (obj->short_name[0]) {
-		strcpy(name, obj->short_name);
-	} else if (obj->hdr_chunk > 0) {
-		int result;
-		u8 *buffer = yaffs_get_temp_buffer(obj->my_dev);
-
-		struct yaffs_obj_hdr *oh = (struct yaffs_obj_hdr *)buffer;
-
-		memset(buffer, 0, obj->my_dev->data_bytes_per_chunk);
-
-		if (obj->hdr_chunk > 0) {
-			result = yaffs_rd_chunk_tags_nand(obj->my_dev,
-							  obj->hdr_chunk,
-							  buffer, NULL);
-		}
-		yaffs_load_name_from_oh(obj->my_dev, name, oh->name,
-					buffer_size);
-
-		yaffs_release_temp_buffer(obj->my_dev, buffer);
-	}
-
-	yaffs_fix_null_name(obj, name, buffer_size);
-
-	return strnlen(name, YAFFS_MAX_NAME_LENGTH);
-}
-
-loff_t yaffs_get_obj_length(struct yaffs_obj *obj)
-{
-	/* Dereference any hard linking */
-	obj = yaffs_get_equivalent_obj(obj);
-
-	if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
-		return obj->variant.file_variant.file_size;
-	if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
-		if (!obj->variant.symlink_variant.alias)
-			return 0;
-		return strnlen(obj->variant.symlink_variant.alias,
-				     YAFFS_MAX_ALIAS_LENGTH);
-	} else {
-		/* Only a directory should drop through to here */
-		return obj->my_dev->data_bytes_per_chunk;
-	}
-}
-
-int yaffs_get_obj_link_count(struct yaffs_obj *obj)
-{
-	int count = 0;
-	struct list_head *i;
-
-	if (!obj->unlinked)
-		count++;	/* the object itself */
-
-	list_for_each(i, &obj->hard_links)
-	    count++;		/* add the hard links; */
-
-	return count;
-}
-
-int yaffs_get_obj_inode(struct yaffs_obj *obj)
-{
-	obj = yaffs_get_equivalent_obj(obj);
-
-	return obj->obj_id;
-}
-
-unsigned yaffs_get_obj_type(struct yaffs_obj *obj)
-{
-	obj = yaffs_get_equivalent_obj(obj);
-
-	switch (obj->variant_type) {
-	case YAFFS_OBJECT_TYPE_FILE:
-		return DT_REG;
-		break;
-	case YAFFS_OBJECT_TYPE_DIRECTORY:
-		return DT_DIR;
-		break;
-	case YAFFS_OBJECT_TYPE_SYMLINK:
-		return DT_LNK;
-		break;
-	case YAFFS_OBJECT_TYPE_HARDLINK:
-		return DT_REG;
-		break;
-	case YAFFS_OBJECT_TYPE_SPECIAL:
-		if (S_ISFIFO(obj->yst_mode))
-			return DT_FIFO;
-		if (S_ISCHR(obj->yst_mode))
-			return DT_CHR;
-		if (S_ISBLK(obj->yst_mode))
-			return DT_BLK;
-		if (S_ISSOCK(obj->yst_mode))
-			return DT_SOCK;
-		return DT_REG;
-		break;
-	default:
-		return DT_REG;
-		break;
-	}
-}
-
-YCHAR *yaffs_get_symlink_alias(struct yaffs_obj *obj)
-{
-	obj = yaffs_get_equivalent_obj(obj);
-	if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK)
-		return yaffs_clone_str(obj->variant.symlink_variant.alias);
-	else
-		return yaffs_clone_str(_Y(""));
-}
-
-/*--------------------------- Initialisation code -------------------------- */
-
-static int yaffs_check_dev_fns(struct yaffs_dev *dev)
-{
-	struct yaffs_driver *drv = &dev->drv;
-	struct yaffs_tags_handler *tagger = &dev->tagger;
-
-	/* Common functions, gotta have */
-	if (!drv->drv_read_chunk_fn ||
-	    !drv->drv_write_chunk_fn ||
-	    !drv->drv_erase_fn)
-		return 0;
-
-	if (dev->param.is_yaffs2 &&
-	     (!drv->drv_mark_bad_fn  || !drv->drv_check_bad_fn))
-		return 0;
-
-	/* Install the default tags marshalling functions if needed. */
-	yaffs_tags_compat_install(dev);
-	yaffs_tags_marshall_install(dev);
-
-	/* Check we now have the marshalling functions required. */
-	if (!tagger->write_chunk_tags_fn ||
-	    !tagger->read_chunk_tags_fn ||
-	    !tagger->query_block_fn ||
-	    !tagger->mark_bad_fn)
-		return 0;
-
-	return 1;
-}
-
-static int yaffs_create_initial_dir(struct yaffs_dev *dev)
-{
-	/* Initialise the unlinked, deleted, root and lost+found directories */
-	dev->lost_n_found = dev->root_dir = NULL;
-	dev->unlinked_dir = dev->del_dir = NULL;
-	dev->unlinked_dir =
-	    yaffs_create_fake_dir(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
-	dev->del_dir =
-	    yaffs_create_fake_dir(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
-	dev->root_dir =
-	    yaffs_create_fake_dir(dev, YAFFS_OBJECTID_ROOT,
-				  YAFFS_ROOT_MODE | S_IFDIR);
-	dev->lost_n_found =
-	    yaffs_create_fake_dir(dev, YAFFS_OBJECTID_LOSTNFOUND,
-				  YAFFS_LOSTNFOUND_MODE | S_IFDIR);
-
-	if (dev->lost_n_found && dev->root_dir && dev->unlinked_dir
-	    && dev->del_dir) {
-		yaffs_add_obj_to_dir(dev->root_dir, dev->lost_n_found);
-		return YAFFS_OK;
-	}
-	return YAFFS_FAIL;
-}
-
-/* Low level init.
- * Typically only used by yaffs_guts_initialise, but also used by the
- * Low level yaffs driver tests.
- */
-
-int yaffs_guts_ll_init(struct yaffs_dev *dev)
-{
-
-
-	yaffs_trace(YAFFS_TRACE_TRACING, "yaffs: yaffs_ll_init()");
-
-	if (!dev) {
-		yaffs_trace(YAFFS_TRACE_ALWAYS,
-			"yaffs: Need a device"
-			);
-		return YAFFS_FAIL;
-	}
-
-	if (dev->ll_init)
-		return YAFFS_OK;
-
-	dev->internal_start_block = dev->param.start_block;
-	dev->internal_end_block = dev->param.end_block;
-	dev->block_offset = 0;
-	dev->chunk_offset = 0;
-	dev->n_free_chunks = 0;
-
-	dev->gc_block = 0;
-
-	if (dev->param.start_block == 0) {
-		dev->internal_start_block = dev->param.start_block + 1;
-		dev->internal_end_block = dev->param.end_block + 1;
-		dev->block_offset = 1;
-		dev->chunk_offset = dev->param.chunks_per_block;
-	}
-
-	/* Check geometry parameters. */
-
-	if ((!dev->param.inband_tags && dev->param.is_yaffs2 &&
-		dev->param.total_bytes_per_chunk < 1024) ||
-		(!dev->param.is_yaffs2 &&
-			dev->param.total_bytes_per_chunk < 512) ||
-		(dev->param.inband_tags && !dev->param.is_yaffs2) ||
-		 dev->param.chunks_per_block < 2 ||
-		 dev->param.n_reserved_blocks < 2 ||
-		dev->internal_start_block <= 0 ||
-		dev->internal_end_block <= 0 ||
-		dev->internal_end_block <=
-		(dev->internal_start_block + dev->param.n_reserved_blocks + 2)
-		) {
-		/* otherwise it is too small */
-		yaffs_trace(YAFFS_TRACE_ALWAYS,
-			"NAND geometry problems: chunk size %d, type is yaffs%s, inband_tags %d ",
-			dev->param.total_bytes_per_chunk,
-			dev->param.is_yaffs2 ? "2" : "",
-			dev->param.inband_tags);
-		return YAFFS_FAIL;
-	}
-
-	/* Sort out space for inband tags, if required */
-	if (dev->param.inband_tags)
-		dev->data_bytes_per_chunk =
-		    dev->param.total_bytes_per_chunk -
-		    sizeof(struct yaffs_packed_tags2_tags_only);
-	else
-		dev->data_bytes_per_chunk = dev->param.total_bytes_per_chunk;
-
-	/* Got the right mix of functions? */
-	if (!yaffs_check_dev_fns(dev)) {
-		/* Function missing */
-		yaffs_trace(YAFFS_TRACE_ALWAYS,
-			"device function(s) missing or wrong");
-
-		return YAFFS_FAIL;
-	}
-
-	if (yaffs_init_nand(dev) != YAFFS_OK) {
-		yaffs_trace(YAFFS_TRACE_ALWAYS, "InitialiseNAND failed");
-		return YAFFS_FAIL;
-	}
-
-	return YAFFS_OK;
-}
-
-
-int yaffs_guts_format_dev(struct yaffs_dev *dev)
-{
-	int i;
-	enum yaffs_block_state state;
-	u32 dummy;
-
-	if(yaffs_guts_ll_init(dev) != YAFFS_OK)
-		return YAFFS_FAIL;
-
-	if(dev->is_mounted)
-		return YAFFS_FAIL;
-
-	for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
-		yaffs_query_init_block_state(dev, i, &state, &dummy);
-		if (state != YAFFS_BLOCK_STATE_DEAD)
-			yaffs_erase_block(dev, i);
-	}
-
-	return YAFFS_OK;
-}
-
-
-int yaffs_guts_initialise(struct yaffs_dev *dev)
-{
-	int init_failed = 0;
-	unsigned x;
-	int bits;
-
-	if(yaffs_guts_ll_init(dev) != YAFFS_OK)
-		return YAFFS_FAIL;
-
-	if (dev->is_mounted) {
-		yaffs_trace(YAFFS_TRACE_ALWAYS, "device already mounted");
-		return YAFFS_FAIL;
-	}
-
-	dev->is_mounted = 1;
-
-	/* OK now calculate a few things for the device */
-
-	/*
-	 *  Calculate all the chunk size manipulation numbers:
-	 */
-	x = dev->data_bytes_per_chunk;
-	/* We always use dev->chunk_shift and dev->chunk_div */
-	dev->chunk_shift = calc_shifts(x);
-	x >>= dev->chunk_shift;
-	dev->chunk_div = x;
-	/* We only use chunk mask if chunk_div is 1 */
-	dev->chunk_mask = (1 << dev->chunk_shift) - 1;
-
-	/*
-	 * Calculate chunk_grp_bits.
-	 * We need to find the next power of 2 > than internal_end_block
-	 */
-
-	x = dev->param.chunks_per_block * (dev->internal_end_block + 1);
-
-	bits = calc_shifts_ceiling(x);
-
-	/* Set up tnode width if wide tnodes are enabled. */
-	if (!dev->param.wide_tnodes_disabled) {
-		/* bits must be even so that we end up with 32-bit words */
-		if (bits & 1)
-			bits++;
-		if (bits < 16)
-			dev->tnode_width = 16;
-		else
-			dev->tnode_width = bits;
-	} else {
-		dev->tnode_width = 16;
-	}
-
-	dev->tnode_mask = (1 << dev->tnode_width) - 1;
-
-	/* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
-	 * so if the bitwidth of the
-	 * chunk range we're using is greater than 16 we need
-	 * to figure out chunk shift and chunk_grp_size
-	 */
-
-	if (bits <= dev->tnode_width)
-		dev->chunk_grp_bits = 0;
-	else
-		dev->chunk_grp_bits = bits - dev->tnode_width;
-
-	dev->tnode_size = (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8;
-	if (dev->tnode_size < sizeof(struct yaffs_tnode))
-		dev->tnode_size = sizeof(struct yaffs_tnode);
-
-	dev->chunk_grp_size = 1 << dev->chunk_grp_bits;
-
-	if (dev->param.chunks_per_block < dev->chunk_grp_size) {
-		/* We have a problem because the soft delete won't work if
-		 * the chunk group size > chunks per block.
-		 * This can be remedied by using larger "virtual blocks".
-		 */
-		yaffs_trace(YAFFS_TRACE_ALWAYS, "chunk group too large");
-
-		return YAFFS_FAIL;
-	}
-
-	/* Finished verifying the device, continue with initialisation */
-
-	/* More device initialisation */
-	dev->all_gcs = 0;
-	dev->passive_gc_count = 0;
-	dev->oldest_dirty_gc_count = 0;
-	dev->bg_gcs = 0;
-	dev->gc_block_finder = 0;
-	dev->buffered_block = -1;
-	dev->doing_buffered_block_rewrite = 0;
-	dev->n_deleted_files = 0;
-	dev->n_bg_deletions = 0;
-	dev->n_unlinked_files = 0;
-	dev->n_ecc_fixed = 0;
-	dev->n_ecc_unfixed = 0;
-	dev->n_tags_ecc_fixed = 0;
-	dev->n_tags_ecc_unfixed = 0;
-	dev->n_erase_failures = 0;
-	dev->n_erased_blocks = 0;
-	dev->gc_disable = 0;
-	dev->has_pending_prioritised_gc = 1;
-		/* Assume the worst for now, will get fixed on first GC */
-	INIT_LIST_HEAD(&dev->dirty_dirs);
-	dev->oldest_dirty_seq = 0;
-	dev->oldest_dirty_block = 0;
-
-	/* Initialise temporary buffers and caches. */
-	if (!yaffs_init_tmp_buffers(dev))
-		init_failed = 1;
-
-	dev->cache = NULL;
-	dev->gc_cleanup_list = NULL;
-
-	if (!init_failed && dev->param.n_caches > 0) {
-		int i;
-		void *buf;
-		int cache_bytes =
-		    dev->param.n_caches * sizeof(struct yaffs_cache);
-
-		if (dev->param.n_caches > YAFFS_MAX_SHORT_OP_CACHES)
-			dev->param.n_caches = YAFFS_MAX_SHORT_OP_CACHES;
-
-		dev->cache = kmalloc(cache_bytes, GFP_NOFS);
-
-		buf = (u8 *) dev->cache;
-
-		if (dev->cache)
-			memset(dev->cache, 0, cache_bytes);
-
-		for (i = 0; i < dev->param.n_caches && buf; i++) {
-			dev->cache[i].object = NULL;
-			dev->cache[i].last_use = 0;
-			dev->cache[i].dirty = 0;
-			dev->cache[i].data = buf =
-			    kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
-		}
-		if (!buf)
-			init_failed = 1;
-
-		dev->cache_last_use = 0;
-	}
-
-	dev->cache_hits = 0;
-
-	if (!init_failed) {
-		dev->gc_cleanup_list =
-		    kmalloc(dev->param.chunks_per_block * sizeof(u32),
-					GFP_NOFS);
-		if (!dev->gc_cleanup_list)
-			init_failed = 1;
-	}
-
-	if (dev->param.is_yaffs2)
-		dev->param.use_header_file_size = 1;
-
-	if (!init_failed && !yaffs_init_blocks(dev))
-		init_failed = 1;
-
-	yaffs_init_tnodes_and_objs(dev);
-
-	if (!init_failed && !yaffs_create_initial_dir(dev))
-		init_failed = 1;
-
-	if (!init_failed && dev->param.is_yaffs2 &&
-		!dev->param.disable_summary &&
-		!yaffs_summary_init(dev))
-		init_failed = 1;
-
-	if (!init_failed) {
-		/* Now scan the flash. */
-		if (dev->param.is_yaffs2) {
-			if (yaffs2_checkpt_restore(dev)) {
-				yaffs_check_obj_details_loaded(dev->root_dir);
-				yaffs_trace(YAFFS_TRACE_CHECKPOINT |
-					YAFFS_TRACE_MOUNT,
-					"yaffs: restored from checkpoint"
-					);
-			} else {
-
-				/* Clean up the mess caused by an aborted
-				 * checkpoint load then scan backwards.
-				 */
-				yaffs_deinit_blocks(dev);
-
-				yaffs_deinit_tnodes_and_objs(dev);
-
-				dev->n_erased_blocks = 0;
-				dev->n_free_chunks = 0;
-				dev->alloc_block = -1;
-				dev->alloc_page = -1;
-				dev->n_deleted_files = 0;
-				dev->n_unlinked_files = 0;
-				dev->n_bg_deletions = 0;
-
-				if (!init_failed && !yaffs_init_blocks(dev))
-					init_failed = 1;
-
-				yaffs_init_tnodes_and_objs(dev);
-
-				if (!init_failed
-				    && !yaffs_create_initial_dir(dev))
-					init_failed = 1;
-
-				if (!init_failed && !yaffs2_scan_backwards(dev))
-					init_failed = 1;
-			}
-		} else if (!yaffs1_scan(dev)) {
-			init_failed = 1;
-		}
-
-		yaffs_strip_deleted_objs(dev);
-		yaffs_fix_hanging_objs(dev);
-		if (dev->param.empty_lost_n_found)
-			yaffs_empty_l_n_f(dev);
-	}
-
-	if (init_failed) {
-		/* Clean up the mess */
-		yaffs_trace(YAFFS_TRACE_TRACING,
-		  "yaffs: yaffs_guts_initialise() aborted.");
-
-		yaffs_deinitialise(dev);
-		return YAFFS_FAIL;
-	}
-
-	/* Zero out stats */
-	dev->n_page_reads = 0;
-	dev->n_page_writes = 0;
-	dev->n_erasures = 0;
-	dev->n_gc_copies = 0;
-	dev->n_retried_writes = 0;
-
-	dev->n_retired_blocks = 0;
-
-	yaffs_verify_free_chunks(dev);
-	yaffs_verify_blocks(dev);
-
-	/* Clean up any aborted checkpoint data */
-	if (!dev->is_checkpointed && dev->blocks_in_checkpt > 0)
-		yaffs2_checkpt_invalidate(dev);
-
-	yaffs_trace(YAFFS_TRACE_TRACING,
-	  "yaffs: yaffs_guts_initialise() done.");
-	return YAFFS_OK;
-}
-
-void yaffs_deinitialise(struct yaffs_dev *dev)
-{
-	if (dev->is_mounted) {
-		int i;
-
-		yaffs_deinit_blocks(dev);
-		yaffs_deinit_tnodes_and_objs(dev);
-		yaffs_summary_deinit(dev);
-
-		if (dev->param.n_caches > 0 && dev->cache) {
-
-			for (i = 0; i < dev->param.n_caches; i++) {
-				kfree(dev->cache[i].data);
-				dev->cache[i].data = NULL;
-			}
-
-			kfree(dev->cache);
-			dev->cache = NULL;
-		}
-
-		kfree(dev->gc_cleanup_list);
-
-		for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
-			kfree(dev->temp_buffer[i].buffer);
-			dev->temp_buffer[i].buffer = NULL;
-		}
-
-		kfree(dev->checkpt_buffer);
-		dev->checkpt_buffer = NULL;
-		kfree(dev->checkpt_block_list);
-		dev->checkpt_block_list = NULL;
-
-		dev->is_mounted = 0;
-
-		yaffs_deinit_nand(dev);
-	}
-}
-
-int yaffs_count_free_chunks(struct yaffs_dev *dev)
-{
-	int n_free = 0;
-	int b;
-	struct yaffs_block_info *blk;
-
-	blk = dev->block_info;
-	for (b = dev->internal_start_block; b <= dev->internal_end_block; b++) {
-		switch (blk->block_state) {
-		case YAFFS_BLOCK_STATE_EMPTY:
-		case YAFFS_BLOCK_STATE_ALLOCATING:
-		case YAFFS_BLOCK_STATE_COLLECTING:
-		case YAFFS_BLOCK_STATE_FULL:
-			n_free +=
-			    (dev->param.chunks_per_block - blk->pages_in_use +
-			     blk->soft_del_pages);
-			break;
-		default:
-			break;
-		}
-		blk++;
-	}
-	return n_free;
-}
-
-int yaffs_get_n_free_chunks(struct yaffs_dev *dev)
-{
-	/* This is what we report to the outside world */
-	int n_free;
-	int n_dirty_caches;
-	int blocks_for_checkpt;
-	int i;
-
-	n_free = dev->n_free_chunks;
-	n_free += dev->n_deleted_files;
-
-	/* Now count and subtract the number of dirty chunks in the cache. */
-
-	for (n_dirty_caches = 0, i = 0; i < dev->param.n_caches; i++) {
-		if (dev->cache[i].dirty)
-			n_dirty_caches++;
-	}
-
-	n_free -= n_dirty_caches;
-
-	n_free -=
-	    ((dev->param.n_reserved_blocks + 1) * dev->param.chunks_per_block);
-
-	/* Now figure checkpoint space and report that... */
-	blocks_for_checkpt = yaffs_calc_checkpt_blocks_required(dev);
-
-	n_free -= (blocks_for_checkpt * dev->param.chunks_per_block);
-
-	if (n_free < 0)
-		n_free = 0;
-
-	return n_free;
-}
-
-
-
-/*
- * Marshalling functions to get loff_t file sizes into and out of
- * object headers.
- */
-void yaffs_oh_size_load(struct yaffs_obj_hdr *oh, loff_t fsize)
-{
-	oh->file_size_low = (fsize & 0xFFFFFFFF);
-	oh->file_size_high = ((fsize >> 32) & 0xFFFFFFFF);
-}
-
-loff_t yaffs_oh_to_size(struct yaffs_obj_hdr *oh)
-{
-	loff_t retval;
-
-	if (sizeof(loff_t) >= 8 && ~(oh->file_size_high))
-		retval = (((loff_t) oh->file_size_high) << 32) |
-			(((loff_t) oh->file_size_low) & 0xFFFFFFFF);
-	else
-		retval = (loff_t) oh->file_size_low;
-
-	return retval;
-}
-
-
-void yaffs_count_blocks_by_state(struct yaffs_dev *dev, int bs[10])
-{
-	int i;
-	struct yaffs_block_info *bi;
-	int s;
-
-	for(i = 0; i < 10; i++)
-		bs[i] = 0;
-
-	for(i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
-		bi = yaffs_get_block_info(dev, i);
-		s = bi->block_state;
-		if(s > YAFFS_BLOCK_STATE_DEAD || s < YAFFS_BLOCK_STATE_UNKNOWN)
-			bs[0]++;
-		else
-			bs[s]++;
-	}
-}

target/linux/generic/files/fs/yaffs2/yaffs_guts.h

@@ -1,1010 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License version 2.1 as
- * published by the Free Software Foundation.
- *
- * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
- */
-
-#ifndef __YAFFS_GUTS_H__
-#define __YAFFS_GUTS_H__
-
-#include "yportenv.h"
-
-#define YAFFS_OK	1
-#define YAFFS_FAIL  0
-
-/* Give us a  Y=0x59,
- * Give us an A=0x41,
- * Give us an FF=0xff
- * Give us an S=0x53
- * And what have we got...
- */
-#define YAFFS_MAGIC			0x5941ff53
-
-/*
- * Tnodes form a tree with the tnodes in "levels"
- * Levels greater than 0 hold 8 slots which point to other tnodes.
- * Those at level 0 hold 16 slots which point to chunks in NAND.
- *
- * A maximum level of 8 thust supports files of size up to:
- *
- * 2^(3*MAX_LEVEL+4)
- *
- * Thus a max level of 8 supports files with up to 2^^28 chunks which gives
- * a maximum file size of around 512Gbytees with 2k chunks.
- */
-#define YAFFS_NTNODES_LEVEL0		16
-#define YAFFS_TNODES_LEVEL0_BITS	4
-#define YAFFS_TNODES_LEVEL0_MASK	0xf
-
-#define YAFFS_NTNODES_INTERNAL		(YAFFS_NTNODES_LEVEL0 / 2)
-#define YAFFS_TNODES_INTERNAL_BITS	(YAFFS_TNODES_LEVEL0_BITS - 1)
-#define YAFFS_TNODES_INTERNAL_MASK	0x7
-#define YAFFS_TNODES_MAX_LEVEL		8
-#define YAFFS_TNODES_MAX_BITS		(YAFFS_TNODES_LEVEL0_BITS + \
-					YAFFS_TNODES_INTERNAL_BITS * \
-					YAFFS_TNODES_MAX_LEVEL)
-#define YAFFS_MAX_CHUNK_ID		((1 << YAFFS_TNODES_MAX_BITS) - 1)
-
-#define YAFFS_MAX_FILE_SIZE_32		0x7fffffff
-
-/* Constants for YAFFS1 mode */
-#define YAFFS_BYTES_PER_SPARE		16
-#define YAFFS_BYTES_PER_CHUNK		512
-#define YAFFS_CHUNK_SIZE_SHIFT		9
-#define YAFFS_CHUNKS_PER_BLOCK		32
-#define YAFFS_BYTES_PER_BLOCK	(YAFFS_CHUNKS_PER_BLOCK*YAFFS_BYTES_PER_CHUNK)
-
-#define YAFFS_MIN_YAFFS2_CHUNK_SIZE	1024
-#define YAFFS_MIN_YAFFS2_SPARE_SIZE	32
-
-
-
-#define YAFFS_ALLOCATION_NOBJECTS	100
-#define YAFFS_ALLOCATION_NTNODES	100
-#define YAFFS_ALLOCATION_NLINKS		100
-
-#define YAFFS_NOBJECT_BUCKETS		256
-
-#define YAFFS_OBJECT_SPACE		0x40000
-#define YAFFS_MAX_OBJECT_ID		(YAFFS_OBJECT_SPACE - 1)
-
-/* Binary data version stamps */
-#define YAFFS_SUMMARY_VERSION		1
-#define YAFFS_CHECKPOINT_VERSION	7
-
-#ifdef CONFIG_YAFFS_UNICODE
-#define YAFFS_MAX_NAME_LENGTH		127
-#define YAFFS_MAX_ALIAS_LENGTH		79
-#else
-#define YAFFS_MAX_NAME_LENGTH		255
-#define YAFFS_MAX_ALIAS_LENGTH		159
-#endif
-
-#define YAFFS_SHORT_NAME_LENGTH		15
-
-/* Some special object ids for pseudo objects */
-#define YAFFS_OBJECTID_ROOT		1
-#define YAFFS_OBJECTID_LOSTNFOUND	2
-#define YAFFS_OBJECTID_UNLINKED		3
-#define YAFFS_OBJECTID_DELETED		4
-
-/* Fake object Id for summary data */
-#define YAFFS_OBJECTID_SUMMARY		0x10
-
-/* Pseudo object ids for checkpointing */
-#define YAFFS_OBJECTID_CHECKPOINT_DATA	0x20
-#define YAFFS_SEQUENCE_CHECKPOINT_DATA	0x21
-
-#define YAFFS_MAX_SHORT_OP_CACHES	20
-
-#define YAFFS_N_TEMP_BUFFERS		6
-
-/* We limit the number attempts at sucessfully saving a chunk of data.
- * Small-page devices have 32 pages per block; large-page devices have 64.
- * Default to something in the order of 5 to 10 blocks worth of chunks.
- */
-#define YAFFS_WR_ATTEMPTS		(5*64)
-
-/* Sequence numbers are used in YAFFS2 to determine block allocation order.
- * The range is limited slightly to help distinguish bad numbers from good.
- * This also allows us to perhaps in the future use special numbers for
- * special purposes.
- * EFFFFF00 allows the allocation of 8 blocks/second (~1Mbytes) for 15 years,
- * and is a larger number than the lifetime of a 2GB device.
- */
-#define YAFFS_LOWEST_SEQUENCE_NUMBER	0x00001000
-#define YAFFS_HIGHEST_SEQUENCE_NUMBER	0xefffff00
-
-/* Special sequence number for bad block that failed to be marked bad */
-#define YAFFS_SEQUENCE_BAD_BLOCK	0xffff0000
-
-/* ChunkCache is used for short read/write operations.*/
-struct yaffs_cache {
-	struct yaffs_obj *object;
-	int chunk_id;
-	int last_use;
-	int dirty;
-	int n_bytes;		/* Only valid if the cache is dirty */
-	int locked;		/* Can't push out or flush while locked. */
-	u8 *data;
-};
-
-/* yaffs1 tags structures in RAM
- * NB This uses bitfield. Bitfields should not straddle a u32 boundary
- * otherwise the structure size will get blown out.
- */
-
-struct yaffs_tags {
-	u32 chunk_id:20;
-	u32 serial_number:2;
-	u32 n_bytes_lsb:10;
-	u32 obj_id:18;
-	u32 ecc:12;
-	u32 n_bytes_msb:2;
-};
-
-union yaffs_tags_union {
-	struct yaffs_tags as_tags;
-	u8 as_bytes[8];
-};
-
-
-/* Stuff used for extended tags in YAFFS2 */
-
-enum yaffs_ecc_result {
-	YAFFS_ECC_RESULT_UNKNOWN,
-	YAFFS_ECC_RESULT_NO_ERROR,
-	YAFFS_ECC_RESULT_FIXED,
-	YAFFS_ECC_RESULT_UNFIXED
-};
-
-enum yaffs_obj_type {
-	YAFFS_OBJECT_TYPE_UNKNOWN,
-	YAFFS_OBJECT_TYPE_FILE,
-	YAFFS_OBJECT_TYPE_SYMLINK,
-	YAFFS_OBJECT_TYPE_DIRECTORY,
-	YAFFS_OBJECT_TYPE_HARDLINK,
-	YAFFS_OBJECT_TYPE_SPECIAL
-};
-
-#define YAFFS_OBJECT_TYPE_MAX YAFFS_OBJECT_TYPE_SPECIAL
-
-struct yaffs_ext_tags {
-	unsigned chunk_used;	/*  Status of the chunk: used or unused */
-	unsigned obj_id;	/* If 0 this is not used */
-	unsigned chunk_id;	/* If 0 this is a header, else a data chunk */
-	unsigned n_bytes;	/* Only valid for data chunks */
-
-	/* The following stuff only has meaning when we read */
-	enum yaffs_ecc_result ecc_result;
-	unsigned block_bad;
-
-	/* YAFFS 1 stuff */
-	unsigned is_deleted;	/* The chunk is marked deleted */
-	unsigned serial_number;	/* Yaffs1 2-bit serial number */
-
-	/* YAFFS2 stuff */
-	unsigned seq_number;	/* The sequence number of this block */
-
-	/* Extra info if this is an object header (YAFFS2 only) */
-
-	unsigned extra_available;	/* Extra info available if not zero */
-	unsigned extra_parent_id;	/* The parent object */
-	unsigned extra_is_shrink;	/* Is it a shrink header? */
-	unsigned extra_shadows;	/* Does this shadow another object? */
-
-	enum yaffs_obj_type extra_obj_type;	/* What object type? */
-
-	loff_t extra_file_size;		/* Length if it is a file */
-	unsigned extra_equiv_id;	/* Equivalent object for a hard link */
-};
-
-/* Spare structure for YAFFS1 */
-struct yaffs_spare {
-	u8 tb0;
-	u8 tb1;
-	u8 tb2;
-	u8 tb3;
-	u8 page_status;		/* set to 0 to delete the chunk */
-	u8 block_status;
-	u8 tb4;
-	u8 tb5;
-	u8 ecc1[3];
-	u8 tb6;
-	u8 tb7;
-	u8 ecc2[3];
-};
-
-/*Special structure for passing through to mtd */
-struct yaffs_nand_spare {
-	struct yaffs_spare spare;
-	int eccres1;
-	int eccres2;
-};
-
-/* Block data in RAM */
-
-enum yaffs_block_state {
-	YAFFS_BLOCK_STATE_UNKNOWN = 0,
-
-	YAFFS_BLOCK_STATE_SCANNING,
-	/* Being scanned */
-
-	YAFFS_BLOCK_STATE_NEEDS_SCAN,
-	/* The block might have something on it (ie it is allocating or full,
-	 * perhaps empty) but it needs to be scanned to determine its true
-	 * state.
-	 * This state is only valid during scanning.
-	 * NB We tolerate empty because the pre-scanner might be incapable of
-	 * deciding
-	 * However, if this state is returned on a YAFFS2 device,
-	 * then we expect a sequence number
-	 */
-
-	YAFFS_BLOCK_STATE_EMPTY,
-	/* This block is empty */
-
-	YAFFS_BLOCK_STATE_ALLOCATING,
-	/* This block is partially allocated.
-	 * At least one page holds valid data.
-	 * This is the one currently being used for page
-	 * allocation. Should never be more than one of these.
-	 * If a block is only partially allocated at mount it is treated as
-	 * full.
-	 */
-
-	YAFFS_BLOCK_STATE_FULL,
-	/* All the pages in this block have been allocated.
-	 * If a block was only partially allocated when mounted we treat
-	 * it as fully allocated.
-	 */
-
-	YAFFS_BLOCK_STATE_DIRTY,
-	/* The block was full and now all chunks have been deleted.
-	 * Erase me, reuse me.
-	 */
-
-	YAFFS_BLOCK_STATE_CHECKPOINT,
-	/* This block is assigned to holding checkpoint data. */
-
-	YAFFS_BLOCK_STATE_COLLECTING,
-	/* This block is being garbage collected */
-
-	YAFFS_BLOCK_STATE_DEAD
-	    /* This block has failed and is not in use */
-};
-
-#define	YAFFS_NUMBER_OF_BLOCK_STATES (YAFFS_BLOCK_STATE_DEAD + 1)
-
-struct yaffs_block_info {
-
-	s32 soft_del_pages:10;	/* number of soft deleted pages */
-	s32 pages_in_use:10;	/* number of pages in use */
-	u32 block_state:4;	/* One of the above block states. */
-				/* NB use unsigned because enum is sometimes
-				 * an int */
-	u32 needs_retiring:1;	/* Data has failed on this block, */
-				/*need to get valid data off and retire*/
-	u32 skip_erased_check:1;/* Skip the erased check on this block */
-	u32 gc_prioritise:1;	/* An ECC check or blank check has failed.
-				   Block should be prioritised for GC */
-	u32 chunk_error_strikes:3;	/* How many times we've had ecc etc
-				failures on this block and tried to reuse it */
-	u32 has_summary:1;	/* The block has a summary */
-
-	u32 has_shrink_hdr:1;	/* This block has at least one shrink header */
-	u32 seq_number;		/* block sequence number for yaffs2 */
-
-};
-
-/* -------------------------- Object structure -------------------------------*/
-/* This is the object structure as stored on NAND */
-
-struct yaffs_obj_hdr {
-	enum yaffs_obj_type type;
-
-	/* Apply to everything  */
-	int parent_obj_id;
-	u16 sum_no_longer_used;	/* checksum of name. No longer used */
-	YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
-
-	/* The following apply to all object types except for hard links */
-	u32 yst_mode;		/* protection */
-
-	u32 yst_uid;
-	u32 yst_gid;
-	u32 yst_atime;
-	u32 yst_mtime;
-	u32 yst_ctime;
-
-	/* File size  applies to files only */
-	u32 file_size_low;
-
-	/* Equivalent object id applies to hard links only. */
-	int equiv_id;
-
-	/* Alias is for symlinks only. */
-	YCHAR alias[YAFFS_MAX_ALIAS_LENGTH + 1];
-
-	u32 yst_rdev;	/* stuff for block and char devices (major/min) */
-
-	u32 win_ctime[2];
-	u32 win_atime[2];
-	u32 win_mtime[2];
-
-	u32 inband_shadowed_obj_id;
-	u32 inband_is_shrink;
-
-	u32 file_size_high;
-	u32 reserved[1];
-	int shadows_obj;	/* This object header shadows the
-				specified object if > 0 */
-
-	/* is_shrink applies to object headers written when wemake a hole. */
-	u32 is_shrink;
-
-};
-
-/*--------------------------- Tnode -------------------------- */
-
-struct yaffs_tnode {
-	struct yaffs_tnode *internal[YAFFS_NTNODES_INTERNAL];
-};
-
-/*------------------------  Object -----------------------------*/
-/* An object can be one of:
- * - a directory (no data, has children links
- * - a regular file (data.... not prunes :->).
- * - a symlink [symbolic link] (the alias).
- * - a hard link
- */
-
-struct yaffs_file_var {
-	loff_t file_size;
-	loff_t scanned_size;
-	loff_t shrink_size;
-	int top_level;
-	struct yaffs_tnode *top;
-};
-
-struct yaffs_dir_var {
-	struct list_head children;	/* list of child links */
-	struct list_head dirty;	/* Entry for list of dirty directories */
-};
-
-struct yaffs_symlink_var {
-	YCHAR *alias;
-};
-
-struct yaffs_hardlink_var {
-	struct yaffs_obj *equiv_obj;
-	u32 equiv_id;
-};
-
-union yaffs_obj_var {
-	struct yaffs_file_var file_variant;
-	struct yaffs_dir_var dir_variant;
-	struct yaffs_symlink_var symlink_variant;
-	struct yaffs_hardlink_var hardlink_variant;
-};
-
-struct yaffs_obj {
-	u8 deleted:1;		/* This should only apply to unlinked files. */
-	u8 soft_del:1;		/* it has also been soft deleted */
-	u8 unlinked:1;		/* An unlinked file.*/
-	u8 fake:1;		/* A fake object has no presence on NAND. */
-	u8 rename_allowed:1;	/* Some objects cannot be renamed. */
-	u8 unlink_allowed:1;
-	u8 dirty:1;		/* the object needs to be written to flash */
-	u8 valid:1;		/* When the file system is being loaded up, this
-				 * object might be created before the data
-				 * is available
-				 * ie. file data chunks encountered before
-				* the header.
-				 */
-	u8 lazy_loaded:1;	/* This object has been lazy loaded and
-				 * is missing some detail */
-
-	u8 defered_free:1;	/* Object is removed from NAND, but is
-				 * still in the inode cache.
-				 * Free of object is defered.
-				 * until the inode is released.
-				 */
-	u8 being_created:1;	/* This object is still being created
-				 * so skip some verification checks. */
-	u8 is_shadowed:1;	/* This object is shadowed on the way
-				 * to being renamed. */
-
-	u8 xattr_known:1;	/* We know if this has object has xattribs
-				 * or not. */
-	u8 has_xattr:1;		/* This object has xattribs.
-				 * Only valid if xattr_known. */
-
-	u8 serial;		/* serial number of chunk in NAND.*/
-	u16 sum;		/* sum of the name to speed searching */
-
-	struct yaffs_dev *my_dev;	/* The device I'm on */
-
-	struct list_head hash_link;	/* list of objects in hash bucket */
-
-	struct list_head hard_links;	/* hard linked object chain*/
-
-	/* directory structure stuff */
-	/* also used for linking up the free list */
-	struct yaffs_obj *parent;
-	struct list_head siblings;
-
-	/* Where's my object header in NAND? */
-	int hdr_chunk;
-
-	int n_data_chunks;	/* Number of data chunks for this file. */
-
-	u32 obj_id;		/* the object id value */
-
-	u32 yst_mode;
-
-	YCHAR short_name[YAFFS_SHORT_NAME_LENGTH + 1];
-
-#ifdef CONFIG_YAFFS_WINCE
-	u32 win_ctime[2];
-	u32 win_mtime[2];
-	u32 win_atime[2];
-#else
-	u32 yst_uid;
-	u32 yst_gid;
-	u32 yst_atime;
-	u32 yst_mtime;
-	u32 yst_ctime;
-#endif
-
-	u32 yst_rdev;
-
-	void *my_inode;
-
-	enum yaffs_obj_type variant_type;
-
-	union yaffs_obj_var variant;
-
-};
-
-struct yaffs_obj_bucket {
-	struct list_head list;
-	int count;
-};
-
-/* yaffs_checkpt_obj holds the definition of an object as dumped
- * by checkpointing.
- */
-
-struct yaffs_checkpt_obj {
-	int struct_type;
-	u32 obj_id;
-	u32 parent_id;
-	int hdr_chunk;
-	enum yaffs_obj_type variant_type:3;
-	u8 deleted:1;
-	u8 soft_del:1;
-	u8 unlinked:1;
-	u8 fake:1;
-	u8 rename_allowed:1;
-	u8 unlink_allowed:1;
-	u8 serial;
-	int n_data_chunks;
-	loff_t size_or_equiv_obj;
-};
-
-/*--------------------- Temporary buffers ----------------
- *
- * These are chunk-sized working buffers. Each device has a few.
- */
-
-struct yaffs_buffer {
-	u8 *buffer;
-	int in_use;
-};
-
-/*----------------- Device ---------------------------------*/
-
-struct yaffs_param {
-	const YCHAR *name;
-
-	/*
-	 * Entry parameters set up way early. Yaffs sets up the rest.
-	 * The structure should be zeroed out before use so that unused
-	 * and default values are zero.
-	 */
-
-	int inband_tags;	/* Use unband tags */
-	u32 total_bytes_per_chunk;	/* Should be >= 512, does not need to
-					 be a power of 2 */
-	int chunks_per_block;	/* does not need to be a power of 2 */
-	int spare_bytes_per_chunk;	/* spare area size */
-	int start_block;	/* Start block we're allowed to use */
-	int end_block;		/* End block we're allowed to use */
-	int n_reserved_blocks;	/* Tuneable so that we can reduce
-				 * reserved blocks on NOR and RAM. */
-
-	int n_caches;		/* If <= 0, then short op caching is disabled,
-				 * else the number of short op caches.
-				 */
-	int cache_bypass_aligned; /* If non-zero then bypass the cache for
-				   * aligned writes.
-				   */
-
-	int use_nand_ecc;	/* Flag to decide whether or not to use
-				 * NAND driver ECC on data (yaffs1) */
-	int tags_9bytes;	/* Use 9 byte tags */
-	int no_tags_ecc;	/* Flag to decide whether or not to do ECC
-				 * on packed tags (yaffs2) */
-
-	int is_yaffs2;		/* Use yaffs2 mode on this device */
-
-	int empty_lost_n_found;	/* Auto-empty lost+found directory on mount */
-
-	int refresh_period;	/* How often to check for a block refresh */
-
-	/* Checkpoint control. Can be set before or after initialisation */
-	u8 skip_checkpt_rd;
-	u8 skip_checkpt_wr;
-
-	int enable_xattr;	/* Enable xattribs */
-
-	int max_objects;	/*
-				 * Set to limit the number of objects created.
-				 * 0 = no limit.
-				*/
-
-	/* The remove_obj_fn function must be supplied by OS flavours that
-	 * need it.
-	 * yaffs direct uses it to implement the faster readdir.
-	 * Linux uses it to protect the directory during unlocking.
-	 */
-	void (*remove_obj_fn) (struct yaffs_obj *obj);
-
-	/* Callback to mark the superblock dirty */
-	void (*sb_dirty_fn) (struct yaffs_dev *dev);
-
-	/*  Callback to control garbage collection. */
-	unsigned (*gc_control_fn) (struct yaffs_dev *dev);
-
-	/* Debug control flags. Don't use unless you know what you're doing */
-	int use_header_file_size;	/* Flag to determine if we should use
-					 * file sizes from the header */
-	int disable_lazy_load;	/* Disable lazy loading on this device */
-	int wide_tnodes_disabled;	/* Set to disable wide tnodes */
-	int disable_soft_del;	/* yaffs 1 only: Set to disable the use of
-				 * softdeletion. */
-
-	int defered_dir_update;	/* Set to defer directory updates */
-
-#ifdef CONFIG_YAFFS_AUTO_UNICODE
-	int auto_unicode;
-#endif
-	int always_check_erased;	/* Force chunk erased check always on */
-
-	int disable_summary;
-	int disable_bad_block_marking;
-
-};
-
-struct yaffs_driver {
-	int (*drv_write_chunk_fn) (struct yaffs_dev *dev, int nand_chunk,
-				   const u8 *data, int data_len,
-				   const u8 *oob, int oob_len);
-	int (*drv_read_chunk_fn) (struct yaffs_dev *dev, int nand_chunk,
-				   u8 *data, int data_len,
-				   u8 *oob, int oob_len,
-				   enum yaffs_ecc_result *ecc_result);
-	int (*drv_erase_fn) (struct yaffs_dev *dev, int block_no);
-	int (*drv_mark_bad_fn) (struct yaffs_dev *dev, int block_no);
-	int (*drv_check_bad_fn) (struct yaffs_dev *dev, int block_no);
-	int (*drv_initialise_fn) (struct yaffs_dev *dev);
-	int (*drv_deinitialise_fn) (struct yaffs_dev *dev);
-};
-
-struct yaffs_tags_handler {
-	int (*write_chunk_tags_fn) (struct yaffs_dev *dev,
-				    int nand_chunk, const u8 *data,
-				    const struct yaffs_ext_tags *tags);
-	int (*read_chunk_tags_fn) (struct yaffs_dev *dev,
-				   int nand_chunk, u8 *data,
-				   struct yaffs_ext_tags *tags);
-
-	int (*query_block_fn) (struct yaffs_dev *dev, int block_no,
-			       enum yaffs_block_state *state,
-			       u32 *seq_number);
-	int (*mark_bad_fn) (struct yaffs_dev *dev, int block_no);
-};
-
-struct yaffs_dev {
-	struct yaffs_param param;
-	struct yaffs_driver drv;
-	struct yaffs_tags_handler tagger;
-
-	/* Context storage. Holds extra OS specific data for this device */
-
-	void *os_context;
-	void *driver_context;
-
-	struct list_head dev_list;
-
-	int ll_init;
-	/* Runtime parameters. Set up by YAFFS. */
-	int data_bytes_per_chunk;
-
-	/* Non-wide tnode stuff */
-	u16 chunk_grp_bits;	/* Number of bits that need to be resolved if
-				 * the tnodes are not wide enough.
-				 */
-	u16 chunk_grp_size;	/* == 2^^chunk_grp_bits */
-
-	/* Stuff to support wide tnodes */
-	u32 tnode_width;
-	u32 tnode_mask;
-	u32 tnode_size;
-
-	/* Stuff for figuring out file offset to chunk conversions */
-	u32 chunk_shift;	/* Shift value */
-	u32 chunk_div;		/* Divisor after shifting: 1 for 2^n sizes */
-	u32 chunk_mask;		/* Mask to use for power-of-2 case */
-
-	int is_mounted;
-	int read_only;
-	int is_checkpointed;
-
-	/* Stuff to support block offsetting to support start block zero */
-	int internal_start_block;
-	int internal_end_block;
-	int block_offset;
-	int chunk_offset;
-
-	/* Runtime checkpointing stuff */
-	int checkpt_page_seq;	/* running sequence number of checkpt pages */
-	int checkpt_byte_count;
-	int checkpt_byte_offs;
-	u8 *checkpt_buffer;
-	int checkpt_open_write;
-	int blocks_in_checkpt;
-	int checkpt_cur_chunk;
-	int checkpt_cur_block;
-	int checkpt_next_block;
-	int *checkpt_block_list;
-	int checkpt_max_blocks;
-	u32 checkpt_sum;
-	u32 checkpt_xor;
-
-	int checkpoint_blocks_required;	/* Number of blocks needed to store
-					 * current checkpoint set */
-
-	/* Block Info */
-	struct yaffs_block_info *block_info;
-	u8 *chunk_bits;		/* bitmap of chunks in use */
-	u8 block_info_alt:1;	/* allocated using alternative alloc */
-	u8 chunk_bits_alt:1;	/* allocated using alternative alloc */
-	int chunk_bit_stride;	/* Number of bytes of chunk_bits per block.
-				 * Must be consistent with chunks_per_block.
-				 */
-
-	int n_erased_blocks;
-	int alloc_block;	/* Current block being allocated off */
-	u32 alloc_page;
-	int alloc_block_finder;	/* Used to search for next allocation block */
-
-	/* Object and Tnode memory management */
-	void *allocator;
-	int n_obj;
-	int n_tnodes;
-
-	int n_hardlinks;
-
-	struct yaffs_obj_bucket obj_bucket[YAFFS_NOBJECT_BUCKETS];
-	u32 bucket_finder;
-
-	int n_free_chunks;
-
-	/* Garbage collection control */
-	u32 *gc_cleanup_list;	/* objects to delete at the end of a GC. */
-	u32 n_clean_ups;
-
-	unsigned has_pending_prioritised_gc;	/* We think this device might
-						have pending prioritised gcs */
-	unsigned gc_disable;
-	unsigned gc_block_finder;
-	unsigned gc_dirtiest;
-	unsigned gc_pages_in_use;
-	unsigned gc_not_done;
-	unsigned gc_block;
-	unsigned gc_chunk;
-	unsigned gc_skip;
-	struct yaffs_summary_tags *gc_sum_tags;
-
-	/* Special directories */
-	struct yaffs_obj *root_dir;
-	struct yaffs_obj *lost_n_found;
-
-	int buffered_block;	/* Which block is buffered here? */
-	int doing_buffered_block_rewrite;
-
-	struct yaffs_cache *cache;
-	int cache_last_use;
-
-	/* Stuff for background deletion and unlinked files. */
-	struct yaffs_obj *unlinked_dir;	/* Directory where unlinked and deleted
-					 files live. */
-	struct yaffs_obj *del_dir;	/* Directory where deleted objects are
-					sent to disappear. */
-	struct yaffs_obj *unlinked_deletion;	/* Current file being
-							background deleted. */
-	int n_deleted_files;	/* Count of files awaiting deletion; */
-	int n_unlinked_files;	/* Count of unlinked files. */
-	int n_bg_deletions;	/* Count of background deletions. */
-
-	/* Temporary buffer management */
-	struct yaffs_buffer temp_buffer[YAFFS_N_TEMP_BUFFERS];
-	int max_temp;
-	int temp_in_use;
-	int unmanaged_buffer_allocs;
-	int unmanaged_buffer_deallocs;
-
-	/* yaffs2 runtime stuff */
-	unsigned seq_number;	/* Sequence number of currently
-					allocating block */
-	unsigned oldest_dirty_seq;
-	unsigned oldest_dirty_block;
-
-	/* Block refreshing */
-	int refresh_skip;	/* A skip down counter.
-				 * Refresh happens when this gets to zero. */
-
-	/* Dirty directory handling */
-	struct list_head dirty_dirs;	/* List of dirty directories */
-
-	/* Summary */
-	int chunks_per_summary;
-	struct yaffs_summary_tags *sum_tags;
-
-	/* Statistics */
-	u32 n_page_writes;
-	u32 n_page_reads;
-	u32 n_erasures;
-	u32 n_bad_queries;
-	u32 n_bad_markings;
-	u32 n_erase_failures;
-	u32 n_gc_copies;
-	u32 all_gcs;
-	u32 passive_gc_count;
-	u32 oldest_dirty_gc_count;
-	u32 n_gc_blocks;
-	u32 bg_gcs;
-	u32 n_retried_writes;
-	u32 n_retired_blocks;
-	u32 n_ecc_fixed;
-	u32 n_ecc_unfixed;
-	u32 n_tags_ecc_fixed;
-	u32 n_tags_ecc_unfixed;
-	u32 n_deletions;
-	u32 n_unmarked_deletions;
-	u32 refresh_count;
-	u32 cache_hits;
-	u32 tags_used;
-	u32 summary_used;
-
-};
-
-/* The CheckpointDevice structure holds the device information that changes
- *at runtime and must be preserved over unmount/mount cycles.
- */
-struct yaffs_checkpt_dev {
-	int struct_type;
-	int n_erased_blocks;
-	int alloc_block;	/* Current block being allocated off */
-	u32 alloc_page;
-	int n_free_chunks;
-
-	int n_deleted_files;	/* Count of files awaiting deletion; */
-	int n_unlinked_files;	/* Count of unlinked files. */
-	int n_bg_deletions;	/* Count of background deletions. */
-
-	/* yaffs2 runtime stuff */
-	unsigned seq_number;	/* Sequence number of currently
-				 * allocating block */
-
-};
-
-struct yaffs_checkpt_validity {
-	int struct_type;
-	u32 magic;
-	u32 version;
-	u32 head;
-};
-
-struct yaffs_shadow_fixer {
-	int obj_id;
-	int shadowed_id;
-	struct yaffs_shadow_fixer *next;
-};
-
-/* Structure for doing xattr modifications */
-struct yaffs_xattr_mod {
-	int set;		/* If 0 then this is a deletion */
-	const YCHAR *name;
-	const void *data;
-	int size;
-	int flags;
-	int result;
-};
-
-/*----------------------- YAFFS Functions -----------------------*/
-
-int yaffs_guts_initialise(struct yaffs_dev *dev);
-void yaffs_deinitialise(struct yaffs_dev *dev);
-
-int yaffs_get_n_free_chunks(struct yaffs_dev *dev);
-
-int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR * old_name,
-		     struct yaffs_obj *new_dir, const YCHAR * new_name);
-
-int yaffs_unlinker(struct yaffs_obj *dir, const YCHAR * name);
-int yaffs_del_obj(struct yaffs_obj *obj);
-struct yaffs_obj *yaffs_retype_obj(struct yaffs_obj *obj,
-				   enum yaffs_obj_type type);
-
-
-int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR * name, int buffer_size);
-loff_t yaffs_get_obj_length(struct yaffs_obj *obj);
-int yaffs_get_obj_inode(struct yaffs_obj *obj);
-unsigned yaffs_get_obj_type(struct yaffs_obj *obj);
-int yaffs_get_obj_link_count(struct yaffs_obj *obj);
-
-/* File operations */
-int yaffs_file_rd(struct yaffs_obj *obj, u8 * buffer, loff_t offset,
-		  int n_bytes);
-int yaffs_wr_file(struct yaffs_obj *obj, const u8 * buffer, loff_t offset,
-		  int n_bytes, int write_trhrough);
-int yaffs_resize_file(struct yaffs_obj *obj, loff_t new_size);
-
-struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent,
-				    const YCHAR *name, u32 mode, u32 uid,
-				    u32 gid);
-
-int yaffs_flush_file(struct yaffs_obj *in,
-		     int update_time,
-		     int data_sync,
-		     int discard_cache);
-
-/* Flushing and checkpointing */
-void yaffs_flush_whole_cache(struct yaffs_dev *dev, int discard);
-
-int yaffs_checkpoint_save(struct yaffs_dev *dev);
-int yaffs_checkpoint_restore(struct yaffs_dev *dev);
-
-/* Directory operations */
-struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR *name,
-				   u32 mode, u32 uid, u32 gid);
-struct yaffs_obj *yaffs_find_by_name(struct yaffs_obj *the_dir,
-				     const YCHAR *name);
-struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number);
-
-/* Link operations */
-struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR *name,
-				 struct yaffs_obj *equiv_obj);
-
-struct yaffs_obj *yaffs_get_equivalent_obj(struct yaffs_obj *obj);
-
-/* Symlink operations */
-struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent,
-				       const YCHAR *name, u32 mode, u32 uid,
-				       u32 gid, const YCHAR *alias);
-YCHAR *yaffs_get_symlink_alias(struct yaffs_obj *obj);
-
-/* Special inodes (fifos, sockets and devices) */
-struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent,
-				       const YCHAR *name, u32 mode, u32 uid,
-				       u32 gid, u32 rdev);
-
-int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR *name,
-		      const void *value, int size, int flags);
-int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR *name, void *value,
-		      int size);
-int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size);
-int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR *name);
-
-/* Special directories */
-struct yaffs_obj *yaffs_root(struct yaffs_dev *dev);
-struct yaffs_obj *yaffs_lost_n_found(struct yaffs_dev *dev);
-
-void yaffs_handle_defered_free(struct yaffs_obj *obj);
-
-void yaffs_update_dirty_dirs(struct yaffs_dev *dev);
-
-int yaffs_bg_gc(struct yaffs_dev *dev, unsigned urgency);
-
-/* Debug dump  */
-int yaffs_dump_obj(struct yaffs_obj *obj);
-
-void yaffs_guts_test(struct yaffs_dev *dev);
-int yaffs_guts_ll_init(struct yaffs_dev *dev);
-
-
-/* A few useful functions to be used within the core files*/
-void yaffs_chunk_del(struct yaffs_dev *dev, int chunk_id, int mark_flash,
-		     int lyn);
-int yaffs_check_ff(u8 *buffer, int n_bytes);
-void yaffs_handle_chunk_error(struct yaffs_dev *dev,
-			      struct yaffs_block_info *bi);
-
-u8 *yaffs_get_temp_buffer(struct yaffs_dev *dev);
-void yaffs_release_temp_buffer(struct yaffs_dev *dev, u8 *buffer);
-
-struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev,
-						 int number,
-						 enum yaffs_obj_type type);
-int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
-			    int nand_chunk, int in_scan);
-void yaffs_set_obj_name(struct yaffs_obj *obj, const YCHAR *name);
-void yaffs_set_obj_name_from_oh(struct yaffs_obj *obj,
-				const struct yaffs_obj_hdr *oh);
-void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj);
-YCHAR *yaffs_clone_str(const YCHAR *str);
-void yaffs_link_fixup(struct yaffs_dev *dev, struct list_head *hard_list);
-void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no);
-int yaffs_update_oh(struct yaffs_obj *in, const YCHAR *name,
-		    int force, int is_shrink, int shadows,
-		    struct yaffs_xattr_mod *xop);
-void yaffs_handle_shadowed_obj(struct yaffs_dev *dev, int obj_id,
-			       int backward_scanning);
-int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks);
-struct yaffs_tnode *yaffs_get_tnode(struct yaffs_dev *dev);
-struct yaffs_tnode *yaffs_add_find_tnode_0(struct yaffs_dev *dev,
-					   struct yaffs_file_var *file_struct,
-					   u32 chunk_id,
-					   struct yaffs_tnode *passed_tn);
-
-int yaffs_do_file_wr(struct yaffs_obj *in, const u8 *buffer, loff_t offset,
-		     int n_bytes, int write_trhrough);
-void yaffs_resize_file_down(struct yaffs_obj *obj, loff_t new_size);
-void yaffs_skip_rest_of_block(struct yaffs_dev *dev);
-
-int yaffs_count_free_chunks(struct yaffs_dev *dev);
-
-struct yaffs_tnode *yaffs_find_tnode_0(struct yaffs_dev *dev,
-				       struct yaffs_file_var *file_struct,
-				       u32 chunk_id);
-
-u32 yaffs_get_group_base(struct yaffs_dev *dev, struct yaffs_tnode *tn,
-			 unsigned pos);
-
-int yaffs_is_non_empty_dir(struct yaffs_obj *obj);
-
-int yaffs_guts_format_dev(struct yaffs_dev *dev);
-
-void yaffs_addr_to_chunk(struct yaffs_dev *dev, loff_t addr,
-				int *chunk_out, u32 *offset_out);
-/*
- * Marshalling functions to get loff_t file sizes into aand out of
- * object headers.
- */
-void yaffs_oh_size_load(struct yaffs_obj_hdr *oh, loff_t fsize);
-loff_t yaffs_oh_to_size(struct yaffs_obj_hdr *oh);
-loff_t yaffs_max_file_size(struct yaffs_dev *dev);
-
-/*
- * Debug function to count number of blocks in each state
- * NB Needs to be called with correct number of integers
- */
-
-void yaffs_count_blocks_by_state(struct yaffs_dev *dev, int bs[10]);
-
-int yaffs_find_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
-				    struct yaffs_ext_tags *tags);
-
-#endif

target/linux/generic/files/fs/yaffs2/yaffs_linux.h

@@ -1,48 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License version 2.1 as
- * published by the Free Software Foundation.
- *
- * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
- */
-
-#ifndef __YAFFS_LINUX_H__
-#define __YAFFS_LINUX_H__
-
-#include "yportenv.h"
-
-struct yaffs_linux_context {
-	struct list_head context_list;	/* List of these we have mounted */
-	struct yaffs_dev *dev;
-	struct super_block *super;
-	struct task_struct *bg_thread;	/* Background thread for this device */
-	int bg_running;
-	struct mutex gross_lock;	/* Gross locking mutex*/
-	u8 *spare_buffer;	/* For mtdif2 use. Don't know the buffer size
-				 * at compile time so we have to allocate it.
-				 */
-	struct list_head search_contexts;
-	struct task_struct *readdir_process;
-	unsigned mount_id;
-	int dirty;
-};
-
-#define yaffs_dev_to_lc(dev) ((struct yaffs_linux_context *)((dev)->os_context))
-#define yaffs_dev_to_mtd(dev) ((struct mtd_info *)((dev)->driver_context))
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-#define WRITE_SIZE_STR "writesize"
-#define WRITE_SIZE(mtd) ((mtd)->writesize)
-#else
-#define WRITE_SIZE_STR "oobblock"
-#define WRITE_SIZE(mtd) ((mtd)->oobblock)
-#endif
-
-#endif

target/linux/generic/files/fs/yaffs2/yaffs_mtdif.c

@@ -1,310 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include "yportenv.h"
-
-#include "yaffs_mtdif.h"
-
-#include "linux/mtd/mtd.h"
-#include "linux/types.h"
-#include "linux/time.h"
-#include "linux/mtd/nand.h"
-#include "linux/kernel.h"
-#include "linux/version.h"
-#include "linux/types.h"
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 14, 0))
-#include "uapi/linux/major.h"
-#endif
-
-#include "yaffs_trace.h"
-#include "yaffs_guts.h"
-#include "yaffs_linux.h"
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 2, 0))
-#define MTD_OPS_AUTO_OOB MTD_OOB_AUTO
-#endif
-
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0))
-#define mtd_erase(m, ei) (m)->erase(m, ei)
-#define mtd_write_oob(m, addr, pops) (m)->write_oob(m, addr, pops)
-#define mtd_read_oob(m, addr, pops) (m)->read_oob(m, addr, pops)
-#define mtd_block_isbad(m, offs) (m)->block_isbad(m, offs)
-#define mtd_block_markbad(m, offs) (m)->block_markbad(m, offs)
-#endif
-
-
-
-int nandmtd_erase_block(struct yaffs_dev *dev, int block_no)
-{
-	struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
-	u32 addr =
-	    ((loff_t) block_no) * dev->param.total_bytes_per_chunk *
-	    dev->param.chunks_per_block;
-	struct erase_info ei;
-	int retval = 0;
-
-	ei.mtd = mtd;
-	ei.addr = addr;
-	ei.len = dev->param.total_bytes_per_chunk * dev->param.chunks_per_block;
-	ei.time = 1000;
-	ei.retries = 2;
-	ei.callback = NULL;
-	ei.priv = (u_long) dev;
-
-	retval = mtd_erase(mtd, &ei);
-
-	if (retval == 0)
-		return YAFFS_OK;
-
-	return YAFFS_FAIL;
-}
-
-
-static 	int yaffs_mtd_write(struct yaffs_dev *dev, int nand_chunk,
-				   const u8 *data, int data_len,
-				   const u8 *oob, int oob_len)
-{
-	struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
-	loff_t addr;
-	struct mtd_oob_ops ops;
-	int retval;
-
-	yaffs_trace(YAFFS_TRACE_MTD,
-			"yaffs_mtd_write(%p, %d, %p, %d, %p, %d)\n",
-			dev, nand_chunk, data, data_len, oob, oob_len);
-
-	if (!data || !data_len) {
-		data = NULL;
-		data_len = 0;
-	}
-
-	if (!oob || !oob_len) {
-		oob = NULL;
-		oob_len = 0;
-	}
-
-	addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
-	memset(&ops, 0, sizeof(ops));
-	ops.mode = MTD_OPS_AUTO_OOB;
-	ops.len = (data) ? data_len : 0;
-	ops.ooblen = oob_len;
-	ops.datbuf = (u8 *)data;
-	ops.oobbuf = (u8 *)oob;
-
-	retval = mtd_write_oob(mtd, addr, &ops);
-	if (retval) {
-		yaffs_trace(YAFFS_TRACE_MTD,
-			"write_oob failed, chunk %d, mtd error %d",
-			nand_chunk, retval);
-	}
-	return retval ? YAFFS_FAIL : YAFFS_OK;
-}
-
-static int yaffs_mtd_read(struct yaffs_dev *dev, int nand_chunk,
-				   u8 *data, int data_len,
-				   u8 *oob, int oob_len,
-				   enum yaffs_ecc_result *ecc_result)
-{
-	struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
-	loff_t addr;
-	struct mtd_oob_ops ops;
-	int retval;
-
-	addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
-	memset(&ops, 0, sizeof(ops));
-	ops.mode = MTD_OPS_AUTO_OOB;
-	ops.len = (data) ? data_len : 0;
-	ops.ooblen = oob_len;
-	ops.datbuf = data;
-	ops.oobbuf = oob;
-
-#if (MTD_VERSION_CODE < MTD_VERSION(2, 6, 20))
-	/* In MTD 2.6.18 to 2.6.19 nand_base.c:nand_do_read_oob() has a bug;
-	 * help it out with ops.len = ops.ooblen when ops.datbuf == NULL.
-	 */
-	ops.len = (ops.datbuf) ? ops.len : ops.ooblen;
-#endif
-	/* Read page and oob using MTD.
-	 * Check status and determine ECC result.
-	 */
-	retval = mtd_read_oob(mtd, addr, &ops);
-	if (retval)
-		yaffs_trace(YAFFS_TRACE_MTD,
-			"read_oob failed, chunk %d, mtd error %d",
-			nand_chunk, retval);
-
-	switch (retval) {
-	case 0:
-		/* no error */
-		if(ecc_result)
-			*ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
-		break;
-
-	case -EUCLEAN:
-		/* MTD's ECC fixed the data */
-		if(ecc_result)
-			*ecc_result = YAFFS_ECC_RESULT_FIXED;
-		dev->n_ecc_fixed++;
-		break;
-
-	case -EBADMSG:
-	default:
-		/* MTD's ECC could not fix the data */
-		dev->n_ecc_unfixed++;
-		if(ecc_result)
-			*ecc_result = YAFFS_ECC_RESULT_UNFIXED;
-		return YAFFS_FAIL;
-	}
-
-	return YAFFS_OK;
-}
-
-static 	int yaffs_mtd_erase(struct yaffs_dev *dev, int block_no)
-{
-	struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
-
-	loff_t addr;
-	struct erase_info ei;
-	int retval = 0;
-	u32 block_size;
-
-	block_size = dev->param.total_bytes_per_chunk *
-		     dev->param.chunks_per_block;
-	addr = ((loff_t) block_no) * block_size;
-
-	ei.mtd = mtd;
-	ei.addr = addr;
-	ei.len = block_size;
-	ei.time = 1000;
-	ei.retries = 2;
-	ei.callback = NULL;
-	ei.priv = (u_long) dev;
-
-	retval = mtd_erase(mtd, &ei);
-
-	if (retval == 0)
-		return YAFFS_OK;
-
-	return YAFFS_FAIL;
-}
-
-static int yaffs_mtd_mark_bad(struct yaffs_dev *dev, int block_no)
-{
-	struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
-	int blocksize = dev->param.chunks_per_block * dev->param.total_bytes_per_chunk;
-	int retval;
-
-	yaffs_trace(YAFFS_TRACE_BAD_BLOCKS, "marking block %d bad", block_no);
-
-	retval = mtd_block_markbad(mtd, (loff_t) blocksize * block_no);
-	return (retval) ? YAFFS_FAIL : YAFFS_OK;
-}
-
-static int yaffs_mtd_check_bad(struct yaffs_dev *dev, int block_no)
-{
-	struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
-	int blocksize = dev->param.chunks_per_block * dev->param.total_bytes_per_chunk;
-	int retval;
-
-	yaffs_trace(YAFFS_TRACE_MTD, "checking block %d bad", block_no);
-
-	retval = mtd_block_isbad(mtd, (loff_t) blocksize * block_no);
-	return (retval) ? YAFFS_FAIL : YAFFS_OK;
-}
-
-static int yaffs_mtd_initialise(struct yaffs_dev *dev)
-{
-	return YAFFS_OK;
-}
-
-static int yaffs_mtd_deinitialise(struct yaffs_dev *dev)
-{
-	return YAFFS_OK;
-}
-
-
-void yaffs_mtd_drv_install(struct yaffs_dev *dev)
-{
-	struct yaffs_driver *drv = &dev->drv;
-
-	drv->drv_write_chunk_fn = yaffs_mtd_write;
-	drv->drv_read_chunk_fn = yaffs_mtd_read;
-	drv->drv_erase_fn = yaffs_mtd_erase;
-	drv->drv_mark_bad_fn = yaffs_mtd_mark_bad;
-	drv->drv_check_bad_fn = yaffs_mtd_check_bad;
-	drv->drv_initialise_fn = yaffs_mtd_initialise;
-	drv->drv_deinitialise_fn = yaffs_mtd_deinitialise;
-}
-
-
-struct mtd_info * yaffs_get_mtd_device(dev_t sdev)
-{
-	struct mtd_info *mtd;
-
-	mtd = yaffs_get_mtd_device(sdev);
-
-	/* Check it's an mtd device..... */
-	if (MAJOR(sdev) != MTD_BLOCK_MAJOR)
-		return NULL;	/* This isn't an mtd device */
-
-	/* Check it's NAND */
-	if (mtd->type != MTD_NANDFLASH && mtd->type != MTD_MLCNANDFLASH) {
-		yaffs_trace(YAFFS_TRACE_ALWAYS,
-			"yaffs: MTD device is not NAND it's type %d",
-			mtd->type);
-		return NULL;
-	}
-
-	yaffs_trace(YAFFS_TRACE_OS, " %s %d", WRITE_SIZE_STR, WRITE_SIZE(mtd));
-	yaffs_trace(YAFFS_TRACE_OS, " oobsize %d", mtd->oobsize);
-	yaffs_trace(YAFFS_TRACE_OS, " erasesize %d", mtd->erasesize);
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
-	yaffs_trace(YAFFS_TRACE_OS, " size %u", mtd->size);
-#else
-	yaffs_trace(YAFFS_TRACE_OS, " size %lld", mtd->size);
-#endif
-
-	return mtd;
-}
-
-int yaffs_verify_mtd(struct mtd_info *mtd, int yaffs_version, int inband_tags)
-{
-	if (yaffs_version == 2) {
-		if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
-		     mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
-		    !inband_tags) {
-			yaffs_trace(YAFFS_TRACE_ALWAYS,
-				"MTD device does not have the right page sizes"
-			);
-			return -1;
-		}
-	} else {
-		if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
-		    mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
-			yaffs_trace(YAFFS_TRACE_ALWAYS,
-				"MTD device does not support have the right page sizes"
-			);
-			return -1;
-		}
-	}
-
-	return 0;
-}
-
-
-void yaffs_put_mtd_device(struct mtd_info *mtd)
-{
-	if(mtd)
-		put_mtd_device(mtd);
-}

target/linux/generic/files/fs/yaffs2/yaffs_mtdif.h

@@ -1,25 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License version 2.1 as
- * published by the Free Software Foundation.
- *
- * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
- */
-
-#ifndef __YAFFS_MTDIF_H__
-#define __YAFFS_MTDIF_H__
-
-#include "yaffs_guts.h"
-
-void yaffs_mtd_drv_install(struct yaffs_dev *dev);
-struct mtd_info * yaffs_get_mtd_device(dev_t sdev);
-void yaffs_put_mtd_device(struct mtd_info *mtd);
-int yaffs_verify_mtd(struct mtd_info *mtd, int yaffs_version, int inband_tags);
-#endif

target/linux/generic/files/fs/yaffs2/yaffs_nameval.c

@@ -1,208 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-/*
- * This simple implementation of a name-value store assumes a small number of
-* values and fits into a small finite buffer.
- *
- * Each attribute is stored as a record:
- *  sizeof(int) bytes   record size.
- *  strnlen+1 bytes name null terminated.
- *  nbytes    value.
- *  ----------
- *  total size  stored in record size
- *
- * This code has not been tested with unicode yet.
- */
-
-#include "yaffs_nameval.h"
-
-#include "yportenv.h"
-
-static int nval_find(const char *xb, int xb_size, const YCHAR *name,
-		     int *exist_size)
-{
-	int pos = 0;
-	int size;
-
-	memcpy(&size, xb, sizeof(int));
-	while (size > 0 && (size < xb_size) && (pos + size < xb_size)) {
-		if (!strncmp((YCHAR *) (xb + pos + sizeof(int)),
-				name, size)) {
-			if (exist_size)
-				*exist_size = size;
-			return pos;
-		}
-		pos += size;
-		if (pos < xb_size - sizeof(int))
-			memcpy(&size, xb + pos, sizeof(int));
-		else
-			size = 0;
-	}
-	if (exist_size)
-		*exist_size = 0;
-	return -ENODATA;
-}
-
-static int nval_used(const char *xb, int xb_size)
-{
-	int pos = 0;
-	int size;
-
-	memcpy(&size, xb + pos, sizeof(int));
-	while (size > 0 && (size < xb_size) && (pos + size < xb_size)) {
-		pos += size;
-		if (pos < xb_size - sizeof(int))
-			memcpy(&size, xb + pos, sizeof(int));
-		else
-			size = 0;
-	}
-	return pos;
-}
-
-int nval_del(char *xb, int xb_size, const YCHAR *name)
-{
-	int pos = nval_find(xb, xb_size, name, NULL);
-	int size;
-
-	if (pos < 0 || pos >= xb_size)
-		return -ENODATA;
-
-	/* Find size, shift rest over this record,
-	 * then zero out the rest of buffer */
-	memcpy(&size, xb + pos, sizeof(int));
-	memcpy(xb + pos, xb + pos + size, xb_size - (pos + size));
-	memset(xb + (xb_size - size), 0, size);
-	return 0;
-}
-
-int nval_set(char *xb, int xb_size, const YCHAR *name, const char *buf,
-		int bsize, int flags)
-{
-	int pos;
-	int namelen = strnlen(name, xb_size);
-	int reclen;
-	int size_exist = 0;
-	int space;
-	int start;
-
-	pos = nval_find(xb, xb_size, name, &size_exist);
-
-	if (flags & XATTR_CREATE && pos >= 0)
-		return -EEXIST;
-	if (flags & XATTR_REPLACE && pos < 0)
-		return -ENODATA;
-
-	start = nval_used(xb, xb_size);
-	space = xb_size - start + size_exist;
-
-	reclen = (sizeof(int) + namelen + 1 + bsize);
-
-	if (reclen > space)
-		return -ENOSPC;
-
-	if (pos >= 0) {
-		nval_del(xb, xb_size, name);
-		start = nval_used(xb, xb_size);
-	}
-
-	pos = start;
-
-	memcpy(xb + pos, &reclen, sizeof(int));
-	pos += sizeof(int);
-	strncpy((YCHAR *) (xb + pos), name, reclen);
-	pos += (namelen + 1);
-	memcpy(xb + pos, buf, bsize);
-	return 0;
-}
-
-int nval_get(const char *xb, int xb_size, const YCHAR * name, char *buf,
-	     int bsize)
-{
-	int pos = nval_find(xb, xb_size, name, NULL);
-	int size;
-
-	if (pos >= 0 && pos < xb_size) {
-
-		memcpy(&size, xb + pos, sizeof(int));
-		pos += sizeof(int);	/* advance past record length */
-		size -= sizeof(int);
-
-		/* Advance over name string */
-		while (xb[pos] && size > 0 && pos < xb_size) {
-			pos++;
-			size--;
-		}
-		/*Advance over NUL */
-		pos++;
-		size--;
-
-		/* If bsize is zero then this is a size query.
-		 * Return the size, but don't copy.
-		 */
-		if (!bsize)
-			return size;
-
-		if (size <= bsize) {
-			memcpy(buf, xb + pos, size);
-			return size;
-		}
-	}
-	if (pos >= 0)
-		return -ERANGE;
-
-	return -ENODATA;
-}
-
-int nval_list(const char *xb, int xb_size, char *buf, int bsize)
-{
-	int pos = 0;
-	int size;
-	int name_len;
-	int ncopied = 0;
-	int filled = 0;
-
-	memcpy(&size, xb + pos, sizeof(int));
-	while (size > sizeof(int) &&
-		size <= xb_size &&
-		(pos + size) < xb_size &&
-		!filled) {
-		pos += sizeof(int);
-		size -= sizeof(int);
-		name_len = strnlen((YCHAR *) (xb + pos), size);
-		if (ncopied + name_len + 1 < bsize) {
-			memcpy(buf, xb + pos, name_len * sizeof(YCHAR));
-			buf += name_len;
-			*buf = '\0';
-			buf++;
-			if (sizeof(YCHAR) > 1) {
-				*buf = '\0';
-				buf++;
-			}
-			ncopied += (name_len + 1);
-		} else {
-			filled = 1;
-		}
-		pos += size;
-		if (pos < xb_size - sizeof(int))
-			memcpy(&size, xb + pos, sizeof(int));
-		else
-			size = 0;
-	}
-	return ncopied;
-}
-
-int nval_hasvalues(const char *xb, int xb_size)
-{
-	return nval_used(xb, xb_size) > 0;
-}

target/linux/generic/files/fs/yaffs2/yaffs_nameval.h

@@ -1,28 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License version 2.1 as
- * published by the Free Software Foundation.
- *
- * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
- */
-
-#ifndef __NAMEVAL_H__
-#define __NAMEVAL_H__
-
-#include "yportenv.h"
-
-int nval_del(char *xb, int xb_size, const YCHAR * name);
-int nval_set(char *xb, int xb_size, const YCHAR * name, const char *buf,
-	     int bsize, int flags);
-int nval_get(const char *xb, int xb_size, const YCHAR * name, char *buf,
-	     int bsize);
-int nval_list(const char *xb, int xb_size, char *buf, int bsize);
-int nval_hasvalues(const char *xb, int xb_size);
-#endif

target/linux/generic/files/fs/yaffs2/yaffs_nand.c

@@ -1,122 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include "yaffs_nand.h"
-#include "yaffs_tagscompat.h"
-
-#include "yaffs_getblockinfo.h"
-#include "yaffs_summary.h"
-
-static int apply_chunk_offset(struct yaffs_dev *dev, int chunk)
-{
-	return chunk - dev->chunk_offset;
-}
-
-int yaffs_rd_chunk_tags_nand(struct yaffs_dev *dev, int nand_chunk,
-			     u8 *buffer, struct yaffs_ext_tags *tags)
-{
-	int result;
-	struct yaffs_ext_tags local_tags;
-	int flash_chunk = apply_chunk_offset(dev, nand_chunk);
-
-	dev->n_page_reads++;
-
-	/* If there are no tags provided use local tags. */
-	if (!tags)
-		tags = &local_tags;
-
-	result = dev->tagger.read_chunk_tags_fn(dev, flash_chunk, buffer, tags);
-	if (tags && tags->ecc_result > YAFFS_ECC_RESULT_NO_ERROR) {
-
-		struct yaffs_block_info *bi;
-		bi = yaffs_get_block_info(dev,
-					  nand_chunk /
-					  dev->param.chunks_per_block);
-		yaffs_handle_chunk_error(dev, bi);
-	}
-	return result;
-}
-
-int yaffs_wr_chunk_tags_nand(struct yaffs_dev *dev,
-				int nand_chunk,
-				const u8 *buffer, struct yaffs_ext_tags *tags)
-{
-	int result;
-	int flash_chunk = apply_chunk_offset(dev, nand_chunk);
-
-	dev->n_page_writes++;
-
-	if (!tags) {
-		yaffs_trace(YAFFS_TRACE_ERROR, "Writing with no tags");
-		BUG();
-		return YAFFS_FAIL;
-	}
-
-	tags->seq_number = dev->seq_number;
-	tags->chunk_used = 1;
-	yaffs_trace(YAFFS_TRACE_WRITE,
-		"Writing chunk %d tags %d %d",
-		nand_chunk, tags->obj_id, tags->chunk_id);
-
-	result = dev->tagger.write_chunk_tags_fn(dev, flash_chunk,
-							buffer, tags);
-
-	yaffs_summary_add(dev, tags, nand_chunk);
-
-	return result;
-}
-
-int yaffs_mark_bad(struct yaffs_dev *dev, int block_no)
-{
-	block_no -= dev->block_offset;
-	dev->n_bad_markings++;
-
-	if (dev->param.disable_bad_block_marking)
-		return YAFFS_OK;
-
-	return dev->tagger.mark_bad_fn(dev, block_no);
-}
-
-
-int yaffs_query_init_block_state(struct yaffs_dev *dev,
-				 int block_no,
-				 enum yaffs_block_state *state,
-				 u32 *seq_number)
-{
-	block_no -= dev->block_offset;
-	return dev->tagger.query_block_fn(dev, block_no, state, seq_number);
-}
-
-int yaffs_erase_block(struct yaffs_dev *dev, int block_no)
-{
-	int result;
-
-	block_no -= dev->block_offset;
-	dev->n_erasures++;
-	result = dev->drv.drv_erase_fn(dev, block_no);
-	return result;
-}
-
-int yaffs_init_nand(struct yaffs_dev *dev)
-{
-	if (dev->drv.drv_initialise_fn)
-		return dev->drv.drv_initialise_fn(dev);
-	return YAFFS_OK;
-}
-
-int yaffs_deinit_nand(struct yaffs_dev *dev)
-{
-	if (dev->drv.drv_deinitialise_fn)
-		return dev->drv.drv_deinitialise_fn(dev);
-	return YAFFS_OK;
-}

target/linux/generic/files/fs/yaffs2/yaffs_nand.h

@@ -1,39 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License version 2.1 as
- * published by the Free Software Foundation.
- *
- * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
- */
-
-#ifndef __YAFFS_NAND_H__
-#define __YAFFS_NAND_H__
-#include "yaffs_guts.h"
-
-int yaffs_rd_chunk_tags_nand(struct yaffs_dev *dev, int nand_chunk,
-			     u8 *buffer, struct yaffs_ext_tags *tags);
-
-int yaffs_wr_chunk_tags_nand(struct yaffs_dev *dev,
-			     int nand_chunk,
-			     const u8 *buffer, struct yaffs_ext_tags *tags);
-
-int yaffs_mark_bad(struct yaffs_dev *dev, int block_no);
-
-int yaffs_query_init_block_state(struct yaffs_dev *dev,
-				 int block_no,
-				 enum yaffs_block_state *state,
-				 unsigned *seq_number);
-
-int yaffs_erase_block(struct yaffs_dev *dev, int flash_block);
-
-int yaffs_init_nand(struct yaffs_dev *dev);
-int yaffs_deinit_nand(struct yaffs_dev *dev);
-
-#endif

target/linux/generic/files/fs/yaffs2/yaffs_packedtags1.c

@@ -1,56 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include "yaffs_packedtags1.h"
-#include "yportenv.h"
-
-static const u8 all_ff[20] = {
-	0xff, 0xff, 0xff, 0xff,
-	0xff, 0xff, 0xff, 0xff,
-	0xff, 0xff, 0xff, 0xff,
-	0xff, 0xff, 0xff, 0xff,
-	0xff, 0xff, 0xff, 0xff
-};
-
-void yaffs_pack_tags1(struct yaffs_packed_tags1 *pt,
-		      const struct yaffs_ext_tags *t)
-{
-	pt->chunk_id = t->chunk_id;
-	pt->serial_number = t->serial_number;
-	pt->n_bytes = t->n_bytes;
-	pt->obj_id = t->obj_id;
-	pt->ecc = 0;
-	pt->deleted = (t->is_deleted) ? 0 : 1;
-	pt->unused_stuff = 0;
-	pt->should_be_ff = 0xffffffff;
-}
-
-void yaffs_unpack_tags1(struct yaffs_ext_tags *t,
-			const struct yaffs_packed_tags1 *pt)
-{
-
-	if (memcmp(all_ff, pt, sizeof(struct yaffs_packed_tags1))) {
-		t->block_bad = 0;
-		if (pt->should_be_ff != 0xffffffff)
-			t->block_bad = 1;
-		t->chunk_used = 1;
-		t->obj_id = pt->obj_id;
-		t->chunk_id = pt->chunk_id;
-		t->n_bytes = pt->n_bytes;
-		t->ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
-		t->is_deleted = (pt->deleted) ? 0 : 1;
-		t->serial_number = pt->serial_number;
-	} else {
-		memset(t, 0, sizeof(struct yaffs_ext_tags));
-	}
-}

target/linux/generic/files/fs/yaffs2/yaffs_packedtags1.h

@@ -1,39 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License version 2.1 as
- * published by the Free Software Foundation.
- *
- * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
- */
-
-/* This is used to pack YAFFS1 tags, not YAFFS2 tags. */
-
-#ifndef __YAFFS_PACKEDTAGS1_H__
-#define __YAFFS_PACKEDTAGS1_H__
-
-#include "yaffs_guts.h"
-
-struct yaffs_packed_tags1 {
-	u32 chunk_id:20;
-	u32 serial_number:2;
-	u32 n_bytes:10;
-	u32 obj_id:18;
-	u32 ecc:12;
-	u32 deleted:1;
-	u32 unused_stuff:1;
-	unsigned should_be_ff;
-
-};
-
-void yaffs_pack_tags1(struct yaffs_packed_tags1 *pt,
-		      const struct yaffs_ext_tags *t);
-void yaffs_unpack_tags1(struct yaffs_ext_tags *t,
-			const struct yaffs_packed_tags1 *pt);
-#endif

target/linux/generic/files/fs/yaffs2/yaffs_packedtags2.c

@@ -1,197 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include "yaffs_packedtags2.h"
-#include "yportenv.h"
-#include "yaffs_trace.h"
-
-/* This code packs a set of extended tags into a binary structure for
- * NAND storage
- */
-
-/* Some of the information is "extra" struff which can be packed in to
- * speed scanning
- * This is defined by having the EXTRA_HEADER_INFO_FLAG set.
- */
-
-/* Extra flags applied to chunk_id */
-
-#define EXTRA_HEADER_INFO_FLAG	0x80000000
-#define EXTRA_SHRINK_FLAG	0x40000000
-#define EXTRA_SHADOWS_FLAG	0x20000000
-#define EXTRA_SPARE_FLAGS	0x10000000
-
-#define ALL_EXTRA_FLAGS		0xf0000000
-
-/* Also, the top 4 bits of the object Id are set to the object type. */
-#define EXTRA_OBJECT_TYPE_SHIFT (28)
-#define EXTRA_OBJECT_TYPE_MASK  ((0x0f) << EXTRA_OBJECT_TYPE_SHIFT)
-
-static void yaffs_dump_packed_tags2_tags_only(
-				const struct yaffs_packed_tags2_tags_only *ptt)
-{
-	yaffs_trace(YAFFS_TRACE_MTD,
-		"packed tags obj %d chunk %d byte %d seq %d",
-		ptt->obj_id, ptt->chunk_id, ptt->n_bytes, ptt->seq_number);
-}
-
-static void yaffs_dump_packed_tags2(const struct yaffs_packed_tags2 *pt)
-{
-	yaffs_dump_packed_tags2_tags_only(&pt->t);
-}
-
-static void yaffs_dump_tags2(const struct yaffs_ext_tags *t)
-{
-	yaffs_trace(YAFFS_TRACE_MTD,
-		"ext.tags eccres %d blkbad %d chused %d obj %d chunk%d byte %d del %d ser %d seq %d",
-		t->ecc_result, t->block_bad, t->chunk_used, t->obj_id,
-		t->chunk_id, t->n_bytes, t->is_deleted, t->serial_number,
-		t->seq_number);
-
-}
-
-static int yaffs_check_tags_extra_packable(const struct yaffs_ext_tags *t)
-{
-	if (t->chunk_id != 0 || !t->extra_available)
-		return 0;
-
-	/* Check if the file size is too long to store */
-	if (t->extra_obj_type == YAFFS_OBJECT_TYPE_FILE &&
-	    (t->extra_file_size >> 31) != 0)
-		return 0;
-	return 1;
-}
-
-void yaffs_pack_tags2_tags_only(struct yaffs_packed_tags2_tags_only *ptt,
-				const struct yaffs_ext_tags *t)
-{
-	ptt->chunk_id = t->chunk_id;
-	ptt->seq_number = t->seq_number;
-	ptt->n_bytes = t->n_bytes;
-	ptt->obj_id = t->obj_id;
-
-	/* Only store extra tags for object headers.
-	 * If it is a file then only store  if the file size is short\
-	 * enough to fit.
-	 */
-	if (yaffs_check_tags_extra_packable(t)) {
-		/* Store the extra header info instead */
-		/* We save the parent object in the chunk_id */
-		ptt->chunk_id = EXTRA_HEADER_INFO_FLAG | t->extra_parent_id;
-		if (t->extra_is_shrink)
-			ptt->chunk_id |= EXTRA_SHRINK_FLAG;
-		if (t->extra_shadows)
-			ptt->chunk_id |= EXTRA_SHADOWS_FLAG;
-
-		ptt->obj_id &= ~EXTRA_OBJECT_TYPE_MASK;
-		ptt->obj_id |= (t->extra_obj_type << EXTRA_OBJECT_TYPE_SHIFT);
-
-		if (t->extra_obj_type == YAFFS_OBJECT_TYPE_HARDLINK)
-			ptt->n_bytes = t->extra_equiv_id;
-		else if (t->extra_obj_type == YAFFS_OBJECT_TYPE_FILE)
-			ptt->n_bytes = (unsigned) t->extra_file_size;
-		else
-			ptt->n_bytes = 0;
-	}
-
-	yaffs_dump_packed_tags2_tags_only(ptt);
-	yaffs_dump_tags2(t);
-}
-
-void yaffs_pack_tags2(struct yaffs_packed_tags2 *pt,
-		      const struct yaffs_ext_tags *t, int tags_ecc)
-{
-	yaffs_pack_tags2_tags_only(&pt->t, t);
-
-	if (tags_ecc)
-		yaffs_ecc_calc_other((unsigned char *)&pt->t,
-				    sizeof(struct yaffs_packed_tags2_tags_only),
-				    &pt->ecc);
-}
-
-void yaffs_unpack_tags2_tags_only(struct yaffs_ext_tags *t,
-				  struct yaffs_packed_tags2_tags_only *ptt)
-{
-	memset(t, 0, sizeof(struct yaffs_ext_tags));
-
-	if (ptt->seq_number == 0xffffffff)
-		return;
-
-	t->block_bad = 0;
-	t->chunk_used = 1;
-	t->obj_id = ptt->obj_id;
-	t->chunk_id = ptt->chunk_id;
-	t->n_bytes = ptt->n_bytes;
-	t->is_deleted = 0;
-	t->serial_number = 0;
-	t->seq_number = ptt->seq_number;
-
-	/* Do extra header info stuff */
-	if (ptt->chunk_id & EXTRA_HEADER_INFO_FLAG) {
-		t->chunk_id = 0;
-		t->n_bytes = 0;
-
-		t->extra_available = 1;
-		t->extra_parent_id = ptt->chunk_id & (~(ALL_EXTRA_FLAGS));
-		t->extra_is_shrink = ptt->chunk_id & EXTRA_SHRINK_FLAG ? 1 : 0;
-		t->extra_shadows = ptt->chunk_id & EXTRA_SHADOWS_FLAG ? 1 : 0;
-		t->extra_obj_type = ptt->obj_id >> EXTRA_OBJECT_TYPE_SHIFT;
-		t->obj_id &= ~EXTRA_OBJECT_TYPE_MASK;
-
-		if (t->extra_obj_type == YAFFS_OBJECT_TYPE_HARDLINK)
-			t->extra_equiv_id = ptt->n_bytes;
-		else
-			t->extra_file_size = ptt->n_bytes;
-	}
-	yaffs_dump_packed_tags2_tags_only(ptt);
-	yaffs_dump_tags2(t);
-}
-
-void yaffs_unpack_tags2(struct yaffs_ext_tags *t, struct yaffs_packed_tags2 *pt,
-			int tags_ecc)
-{
-	enum yaffs_ecc_result ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
-
-	if (pt->t.seq_number != 0xffffffff && tags_ecc) {
-		/* Chunk is in use and we need to do ECC */
-
-		struct yaffs_ecc_other ecc;
-		int result;
-		yaffs_ecc_calc_other((unsigned char *)&pt->t,
-				sizeof(struct yaffs_packed_tags2_tags_only),
-				&ecc);
-		result =
-		    yaffs_ecc_correct_other((unsigned char *)&pt->t,
-				sizeof(struct yaffs_packed_tags2_tags_only),
-				&pt->ecc, &ecc);
-		switch (result) {
-		case 0:
-			ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
-			break;
-		case 1:
-			ecc_result = YAFFS_ECC_RESULT_FIXED;
-			break;
-		case -1:
-			ecc_result = YAFFS_ECC_RESULT_UNFIXED;
-			break;
-		default:
-			ecc_result = YAFFS_ECC_RESULT_UNKNOWN;
-		}
-	}
-	yaffs_unpack_tags2_tags_only(t, &pt->t);
-
-	t->ecc_result = ecc_result;
-
-	yaffs_dump_packed_tags2(pt);
-	yaffs_dump_tags2(t);
-}

target/linux/generic/files/fs/yaffs2/yaffs_packedtags2.h

@@ -1,47 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License version 2.1 as
- * published by the Free Software Foundation.
- *
- * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
- */
-
-/* This is used to pack YAFFS2 tags, not YAFFS1tags. */
-
-#ifndef __YAFFS_PACKEDTAGS2_H__
-#define __YAFFS_PACKEDTAGS2_H__
-
-#include "yaffs_guts.h"
-#include "yaffs_ecc.h"
-
-struct yaffs_packed_tags2_tags_only {
-	unsigned seq_number;
-	unsigned obj_id;
-	unsigned chunk_id;
-	unsigned n_bytes;
-};
-
-struct yaffs_packed_tags2 {
-	struct yaffs_packed_tags2_tags_only t;
-	struct yaffs_ecc_other ecc;
-};
-
-/* Full packed tags with ECC, used for oob tags */
-void yaffs_pack_tags2(struct yaffs_packed_tags2 *pt,
-		      const struct yaffs_ext_tags *t, int tags_ecc);
-void yaffs_unpack_tags2(struct yaffs_ext_tags *t, struct yaffs_packed_tags2 *pt,
-			int tags_ecc);
-
-/* Only the tags part (no ECC for use with inband tags */
-void yaffs_pack_tags2_tags_only(struct yaffs_packed_tags2_tags_only *pt,
-				const struct yaffs_ext_tags *t);
-void yaffs_unpack_tags2_tags_only(struct yaffs_ext_tags *t,
-				  struct yaffs_packed_tags2_tags_only *pt);
-#endif

target/linux/generic/files/fs/yaffs2/yaffs_summary.c

@@ -1,312 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-/* Summaries write the useful part of the tags for the chunks in a block into an
- * an array which is written to the last n chunks of the block.
- * Reading the summaries gives all the tags for the block in one read. Much
- * faster.
- *
- * Chunks holding summaries are marked with tags making it look like
- * they are part of a fake file.
- *
- * The summary could also be used during gc.
- *
- */
-
-#include "yaffs_summary.h"
-#include "yaffs_packedtags2.h"
-#include "yaffs_nand.h"
-#include "yaffs_getblockinfo.h"
-#include "yaffs_bitmap.h"
-
-/*
- * The summary is built up in an array of summary tags.
- * This gets written to the last one or two (maybe more) chunks in a block.
- * A summary header is written as the first part of each chunk of summary data.
- * The summary header must match or the summary is rejected.
- */
-
-/* Summary tags don't need the sequence number because that is redundant. */
-struct yaffs_summary_tags {
-	unsigned obj_id;
-	unsigned chunk_id;
-	unsigned n_bytes;
-};
-
-/* Summary header */
-struct yaffs_summary_header {
-	unsigned version;	/* Must match current version */
-	unsigned block;		/* Must be this block */
-	unsigned seq;		/* Must be this sequence number */
-	unsigned sum;		/* Just add up all the bytes in the tags */
-};
-
-
-static void yaffs_summary_clear(struct yaffs_dev *dev)
-{
-	if (!dev->sum_tags)
-		return;
-	memset(dev->sum_tags, 0, dev->chunks_per_summary *
-		sizeof(struct yaffs_summary_tags));
-}
-
-
-void yaffs_summary_deinit(struct yaffs_dev *dev)
-{
-	kfree(dev->sum_tags);
-	dev->sum_tags = NULL;
-	kfree(dev->gc_sum_tags);
-	dev->gc_sum_tags = NULL;
-	dev->chunks_per_summary = 0;
-}
-
-int yaffs_summary_init(struct yaffs_dev *dev)
-{
-	int sum_bytes;
-	int chunks_used; /* Number of chunks used by summary */
-	int sum_tags_bytes;
-
-	sum_bytes = dev->param.chunks_per_block *
-			sizeof(struct yaffs_summary_tags);
-
-	chunks_used = (sum_bytes + dev->data_bytes_per_chunk - 1)/
-			(dev->data_bytes_per_chunk -
-				sizeof(struct yaffs_summary_header));
-
-	dev->chunks_per_summary = dev->param.chunks_per_block - chunks_used;
-	sum_tags_bytes = sizeof(struct yaffs_summary_tags) *
-				dev->chunks_per_summary;
-	dev->sum_tags = kmalloc(sum_tags_bytes, GFP_NOFS);
-	dev->gc_sum_tags = kmalloc(sum_tags_bytes, GFP_NOFS);
-	if (!dev->sum_tags || !dev->gc_sum_tags) {
-		yaffs_summary_deinit(dev);
-		return YAFFS_FAIL;
-	}
-
-	yaffs_summary_clear(dev);
-
-	return YAFFS_OK;
-}
-
-static unsigned yaffs_summary_sum(struct yaffs_dev *dev)
-{
-	u8 *sum_buffer = (u8 *)dev->sum_tags;
-	int i;
-	unsigned sum = 0;
-
-	i = sizeof(struct yaffs_summary_tags) *
-				dev->chunks_per_summary;
-	while (i > 0) {
-		sum += *sum_buffer;
-		sum_buffer++;
-		i--;
-	}
-
-	return sum;
-}
-
-static int yaffs_summary_write(struct yaffs_dev *dev, int blk)
-{
-	struct yaffs_ext_tags tags;
-	u8 *buffer;
-	u8 *sum_buffer = (u8 *)dev->sum_tags;
-	int n_bytes;
-	int chunk_in_nand;
-	int chunk_in_block;
-	int result;
-	int this_tx;
-	struct yaffs_summary_header hdr;
-	int sum_bytes_per_chunk = dev->data_bytes_per_chunk - sizeof(hdr);
-	struct yaffs_block_info *bi = yaffs_get_block_info(dev, blk);
-
-	buffer = yaffs_get_temp_buffer(dev);
-	n_bytes = sizeof(struct yaffs_summary_tags) *
-				dev->chunks_per_summary;
-	memset(&tags, 0, sizeof(struct yaffs_ext_tags));
-	tags.obj_id = YAFFS_OBJECTID_SUMMARY;
-	tags.chunk_id = 1;
-	chunk_in_block = dev->chunks_per_summary;
-	chunk_in_nand = dev->alloc_block * dev->param.chunks_per_block +
-						dev->chunks_per_summary;
-	hdr.version = YAFFS_SUMMARY_VERSION;
-	hdr.block = blk;
-	hdr.seq = bi->seq_number;
-	hdr.sum = yaffs_summary_sum(dev);
-
-	do {
-		this_tx = n_bytes;
-		if (this_tx > sum_bytes_per_chunk)
-			this_tx = sum_bytes_per_chunk;
-		memcpy(buffer, &hdr, sizeof(hdr));
-		memcpy(buffer + sizeof(hdr), sum_buffer, this_tx);
-		tags.n_bytes = this_tx + sizeof(hdr);
-		result = yaffs_wr_chunk_tags_nand(dev, chunk_in_nand,
-						buffer, &tags);
-
-		if (result != YAFFS_OK)
-			break;
-		yaffs_set_chunk_bit(dev, blk, chunk_in_block);
-		bi->pages_in_use++;
-		dev->n_free_chunks--;
-
-		n_bytes -= this_tx;
-		sum_buffer += this_tx;
-		chunk_in_nand++;
-		chunk_in_block++;
-		tags.chunk_id++;
-	} while (result == YAFFS_OK && n_bytes > 0);
-	yaffs_release_temp_buffer(dev, buffer);
-
-
-	if (result == YAFFS_OK)
-		bi->has_summary = 1;
-
-
-	return result;
-}
-
-int yaffs_summary_read(struct yaffs_dev *dev,
-			struct yaffs_summary_tags *st,
-			int blk)
-{
-	struct yaffs_ext_tags tags;
-	u8 *buffer;
-	u8 *sum_buffer = (u8 *)st;
-	int n_bytes;
-	int chunk_id;
-	int chunk_in_nand;
-	int chunk_in_block;
-	int result;
-	int this_tx;
-	struct yaffs_summary_header hdr;
-	struct yaffs_block_info *bi = yaffs_get_block_info(dev, blk);
-	int sum_bytes_per_chunk = dev->data_bytes_per_chunk - sizeof(hdr);
-	int sum_tags_bytes;
-
-	sum_tags_bytes = sizeof(struct yaffs_summary_tags) *
-				dev->chunks_per_summary;
-	buffer = yaffs_get_temp_buffer(dev);
-	n_bytes = sizeof(struct yaffs_summary_tags) * dev->chunks_per_summary;
-	chunk_in_block = dev->chunks_per_summary;
-	chunk_in_nand = blk * dev->param.chunks_per_block +
-							dev->chunks_per_summary;
-	chunk_id = 1;
-	do {
-		this_tx = n_bytes;
-		if (this_tx > sum_bytes_per_chunk)
-			this_tx = sum_bytes_per_chunk;
-		result = yaffs_rd_chunk_tags_nand(dev, chunk_in_nand,
-						buffer, &tags);
-
-		if (tags.chunk_id != chunk_id ||
-			tags.obj_id != YAFFS_OBJECTID_SUMMARY ||
-			tags.chunk_used == 0 ||
-			tags.ecc_result > YAFFS_ECC_RESULT_FIXED ||
-			tags.n_bytes != (this_tx + sizeof(hdr)))
-				result = YAFFS_FAIL;
-		if (result != YAFFS_OK)
-			break;
-
-		if (st == dev->sum_tags) {
-			/* If we're scanning then update the block info */
-			yaffs_set_chunk_bit(dev, blk, chunk_in_block);
-			bi->pages_in_use++;
-		}
-		memcpy(&hdr, buffer, sizeof(hdr));
-		memcpy(sum_buffer, buffer + sizeof(hdr), this_tx);
-		n_bytes -= this_tx;
-		sum_buffer += this_tx;
-		chunk_in_nand++;
-		chunk_in_block++;
-		chunk_id++;
-	} while (result == YAFFS_OK && n_bytes > 0);
-	yaffs_release_temp_buffer(dev, buffer);
-
-	if (result == YAFFS_OK) {
-		/* Verify header */
-		if (hdr.version != YAFFS_SUMMARY_VERSION ||
-		    hdr.seq != bi->seq_number ||
-		    hdr.sum != yaffs_summary_sum(dev))
-			result = YAFFS_FAIL;
-	}
-
-	if (st == dev->sum_tags && result == YAFFS_OK)
-		bi->has_summary = 1;
-
-	return result;
-}
-
-int yaffs_summary_add(struct yaffs_dev *dev,
-			struct yaffs_ext_tags *tags,
-			int chunk_in_nand)
-{
-	struct yaffs_packed_tags2_tags_only tags_only;
-	struct yaffs_summary_tags *sum_tags;
-	int block_in_nand = chunk_in_nand / dev->param.chunks_per_block;
-	int chunk_in_block = chunk_in_nand % dev->param.chunks_per_block;
-
-	if (!dev->sum_tags)
-		return YAFFS_OK;
-
-	if (chunk_in_block >= 0 && chunk_in_block < dev->chunks_per_summary) {
-		yaffs_pack_tags2_tags_only(&tags_only, tags);
-		sum_tags = &dev->sum_tags[chunk_in_block];
-		sum_tags->chunk_id = tags_only.chunk_id;
-		sum_tags->n_bytes = tags_only.n_bytes;
-		sum_tags->obj_id = tags_only.obj_id;
-
-		if (chunk_in_block == dev->chunks_per_summary - 1) {
-			/* Time to write out the summary */
-			yaffs_summary_write(dev, block_in_nand);
-			yaffs_summary_clear(dev);
-			yaffs_skip_rest_of_block(dev);
-		}
-	}
-	return YAFFS_OK;
-}
-
-int yaffs_summary_fetch(struct yaffs_dev *dev,
-			struct yaffs_ext_tags *tags,
-			int chunk_in_block)
-{
-	struct yaffs_packed_tags2_tags_only tags_only;
-	struct yaffs_summary_tags *sum_tags;
-	if (chunk_in_block >= 0 && chunk_in_block < dev->chunks_per_summary) {
-		sum_tags = &dev->sum_tags[chunk_in_block];
-		tags_only.chunk_id = sum_tags->chunk_id;
-		tags_only.n_bytes = sum_tags->n_bytes;
-		tags_only.obj_id = sum_tags->obj_id;
-		yaffs_unpack_tags2_tags_only(tags, &tags_only);
-		return YAFFS_OK;
-	}
-	return YAFFS_FAIL;
-}
-
-void yaffs_summary_gc(struct yaffs_dev *dev, int blk)
-{
-	struct yaffs_block_info *bi = yaffs_get_block_info(dev, blk);
-	int i;
-
-	if (!bi->has_summary)
-		return;
-
-	for (i = dev->chunks_per_summary;
-	     i < dev->param.chunks_per_block;
-	     i++) {
-		if (yaffs_check_chunk_bit(dev, blk, i)) {
-			yaffs_clear_chunk_bit(dev, blk, i);
-			bi->pages_in_use--;
-			dev->n_free_chunks++;
-		}
-	}
-}

target/linux/generic/files/fs/yaffs2/yaffs_summary.h

@@ -1,37 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License version 2.1 as
- * published by the Free Software Foundation.
- *
- * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
- */
-
-#ifndef __YAFFS_SUMMARY_H__
-#define __YAFFS_SUMMARY_H__
-
-#include "yaffs_packedtags2.h"
-
-
-int yaffs_summary_init(struct yaffs_dev *dev);
-void yaffs_summary_deinit(struct yaffs_dev *dev);
-
-int yaffs_summary_add(struct yaffs_dev *dev,
-			struct yaffs_ext_tags *tags,
-			int chunk_in_block);
-int yaffs_summary_fetch(struct yaffs_dev *dev,
-			struct yaffs_ext_tags *tags,
-			int chunk_in_block);
-int yaffs_summary_read(struct yaffs_dev *dev,
-			struct yaffs_summary_tags *st,
-			int blk);
-void yaffs_summary_gc(struct yaffs_dev *dev, int blk);
-
-
-#endif

target/linux/generic/files/fs/yaffs2/yaffs_tagscompat.c

@@ -1,381 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include "yaffs_guts.h"
-#include "yaffs_tagscompat.h"
-#include "yaffs_ecc.h"
-#include "yaffs_getblockinfo.h"
-#include "yaffs_trace.h"
-
-static void yaffs_handle_rd_data_error(struct yaffs_dev *dev, int nand_chunk);
-
-
-/********** Tags ECC calculations  *********/
-
-
-void yaffs_calc_tags_ecc(struct yaffs_tags *tags)
-{
-	/* Calculate an ecc */
-	unsigned char *b = ((union yaffs_tags_union *)tags)->as_bytes;
-	unsigned i, j;
-	unsigned ecc = 0;
-	unsigned bit = 0;
-
-	tags->ecc = 0;
-
-	for (i = 0; i < 8; i++) {
-		for (j = 1; j & 0xff; j <<= 1) {
-			bit++;
-			if (b[i] & j)
-				ecc ^= bit;
-		}
-	}
-	tags->ecc = ecc;
-}
-
-int yaffs_check_tags_ecc(struct yaffs_tags *tags)
-{
-	unsigned ecc = tags->ecc;
-
-	yaffs_calc_tags_ecc(tags);
-
-	ecc ^= tags->ecc;
-
-	if (ecc && ecc <= 64) {
-		/* TODO: Handle the failure better. Retire? */
-		unsigned char *b = ((union yaffs_tags_union *)tags)->as_bytes;
-
-		ecc--;
-
-		b[ecc / 8] ^= (1 << (ecc & 7));
-
-		/* Now recvalc the ecc */
-		yaffs_calc_tags_ecc(tags);
-
-		return 1;	/* recovered error */
-	} else if (ecc) {
-		/* Wierd ecc failure value */
-		/* TODO Need to do somethiong here */
-		return -1;	/* unrecovered error */
-	}
-	return 0;
-}
-
-/********** Tags **********/
-
-static void yaffs_load_tags_to_spare(struct yaffs_spare *spare_ptr,
-				     struct yaffs_tags *tags_ptr)
-{
-	union yaffs_tags_union *tu = (union yaffs_tags_union *)tags_ptr;
-
-	yaffs_calc_tags_ecc(tags_ptr);
-
-	spare_ptr->tb0 = tu->as_bytes[0];
-	spare_ptr->tb1 = tu->as_bytes[1];
-	spare_ptr->tb2 = tu->as_bytes[2];
-	spare_ptr->tb3 = tu->as_bytes[3];
-	spare_ptr->tb4 = tu->as_bytes[4];
-	spare_ptr->tb5 = tu->as_bytes[5];
-	spare_ptr->tb6 = tu->as_bytes[6];
-	spare_ptr->tb7 = tu->as_bytes[7];
-}
-
-static void yaffs_get_tags_from_spare(struct yaffs_dev *dev,
-				      struct yaffs_spare *spare_ptr,
-				      struct yaffs_tags *tags_ptr)
-{
-	union yaffs_tags_union *tu = (union yaffs_tags_union *)tags_ptr;
-	int result;
-
-	tu->as_bytes[0] = spare_ptr->tb0;
-	tu->as_bytes[1] = spare_ptr->tb1;
-	tu->as_bytes[2] = spare_ptr->tb2;
-	tu->as_bytes[3] = spare_ptr->tb3;
-	tu->as_bytes[4] = spare_ptr->tb4;
-	tu->as_bytes[5] = spare_ptr->tb5;
-	tu->as_bytes[6] = spare_ptr->tb6;
-	tu->as_bytes[7] = spare_ptr->tb7;
-
-	result = yaffs_check_tags_ecc(tags_ptr);
-	if (result > 0)
-		dev->n_tags_ecc_fixed++;
-	else if (result < 0)
-		dev->n_tags_ecc_unfixed++;
-}
-
-static void yaffs_spare_init(struct yaffs_spare *spare)
-{
-	memset(spare, 0xff, sizeof(struct yaffs_spare));
-}
-
-static int yaffs_wr_nand(struct yaffs_dev *dev,
-			 int nand_chunk, const u8 *data,
-			 struct yaffs_spare *spare)
-{
-	int data_size = dev->data_bytes_per_chunk;
-
-	return dev->drv.drv_write_chunk_fn(dev, nand_chunk,
-				data, data_size,
-				(u8 *) spare, sizeof(*spare));
-}
-
-static int yaffs_rd_chunk_nand(struct yaffs_dev *dev,
-			       int nand_chunk,
-			       u8 *data,
-			       struct yaffs_spare *spare,
-			       enum yaffs_ecc_result *ecc_result,
-			       int correct_errors)
-{
-	int ret_val;
-	struct yaffs_spare local_spare;
-	int data_size;
-	int spare_size;
-	int ecc_result1, ecc_result2;
-	u8 calc_ecc[3];
-
-	if (!spare) {
-		/* If we don't have a real spare, then we use a local one. */
-		/* Need this for the calculation of the ecc */
-		spare = &local_spare;
-	}
-	data_size = dev->data_bytes_per_chunk;
-	spare_size = sizeof(struct yaffs_spare);
-
-	if (dev->param.use_nand_ecc)
-		return dev->drv.drv_read_chunk_fn(dev, nand_chunk,
-						data, data_size,
-						(u8 *) spare, spare_size,
-						ecc_result);
-
-
-	/* Handle the ECC at this level. */
-
-	ret_val = dev->drv.drv_read_chunk_fn(dev, nand_chunk,
-						 data, data_size,
-						 (u8 *)spare, spare_size,
-						NULL);
-	if (!data || !correct_errors)
-		return ret_val;
-
-	/* Do ECC correction if needed. */
-	yaffs_ecc_calc(data, calc_ecc);
-	ecc_result1 = yaffs_ecc_correct(data, spare->ecc1, calc_ecc);
-	yaffs_ecc_calc(&data[256], calc_ecc);
-	ecc_result2 = yaffs_ecc_correct(&data[256], spare->ecc2, calc_ecc);
-
-	if (ecc_result1 > 0) {
-		yaffs_trace(YAFFS_TRACE_ERROR,
-			"**>>yaffs ecc error fix performed on chunk %d:0",
-			nand_chunk);
-		dev->n_ecc_fixed++;
-	} else if (ecc_result1 < 0) {
-		yaffs_trace(YAFFS_TRACE_ERROR,
-			"**>>yaffs ecc error unfixed on chunk %d:0",
-			nand_chunk);
-		dev->n_ecc_unfixed++;
-	}
-
-	if (ecc_result2 > 0) {
-		yaffs_trace(YAFFS_TRACE_ERROR,
-			"**>>yaffs ecc error fix performed on chunk %d:1",
-			nand_chunk);
-		dev->n_ecc_fixed++;
-	} else if (ecc_result2 < 0) {
-		yaffs_trace(YAFFS_TRACE_ERROR,
-			"**>>yaffs ecc error unfixed on chunk %d:1",
-			nand_chunk);
-		dev->n_ecc_unfixed++;
-	}
-
-	if (ecc_result1 || ecc_result2) {
-		/* We had a data problem on this page */
-		yaffs_handle_rd_data_error(dev, nand_chunk);
-	}
-
-	if (ecc_result1 < 0 || ecc_result2 < 0)
-		*ecc_result = YAFFS_ECC_RESULT_UNFIXED;
-	else if (ecc_result1 > 0 || ecc_result2 > 0)
-		*ecc_result = YAFFS_ECC_RESULT_FIXED;
-	else
-		*ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
-
-	return ret_val;
-}
-
-/*
- * Functions for robustisizing
- */
-
-static void yaffs_handle_rd_data_error(struct yaffs_dev *dev, int nand_chunk)
-{
-	int flash_block = nand_chunk / dev->param.chunks_per_block;
-
-	/* Mark the block for retirement */
-	yaffs_get_block_info(dev, flash_block + dev->block_offset)->
-		needs_retiring = 1;
-	yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
-		"**>>Block %d marked for retirement",
-		flash_block);
-
-	/* TODO:
-	 * Just do a garbage collection on the affected block
-	 * then retire the block
-	 * NB recursion
-	 */
-}
-
-static int yaffs_tags_compat_wr(struct yaffs_dev *dev,
-			 int nand_chunk,
-			 const u8 *data, const struct yaffs_ext_tags *ext_tags)
-{
-	struct yaffs_spare spare;
-	struct yaffs_tags tags;
-
-	yaffs_spare_init(&spare);
-
-	if (ext_tags->is_deleted)
-		spare.page_status = 0;
-	else {
-		tags.obj_id = ext_tags->obj_id;
-		tags.chunk_id = ext_tags->chunk_id;
-
-		tags.n_bytes_lsb = ext_tags->n_bytes & (1024 - 1);
-
-		if (dev->data_bytes_per_chunk >= 1024)
-			tags.n_bytes_msb = (ext_tags->n_bytes >> 10) & 3;
-		else
-			tags.n_bytes_msb = 3;
-
-		tags.serial_number = ext_tags->serial_number;
-
-		if (!dev->param.use_nand_ecc && data) {
-			yaffs_ecc_calc(data, spare.ecc1);
-			yaffs_ecc_calc(&data[256], spare.ecc2);
-		}
-
-		yaffs_load_tags_to_spare(&spare, &tags);
-	}
-	return yaffs_wr_nand(dev, nand_chunk, data, &spare);
-}
-
-static int yaffs_tags_compat_rd(struct yaffs_dev *dev,
-			 int nand_chunk,
-			 u8 *data, struct yaffs_ext_tags *ext_tags)
-{
-	struct yaffs_spare spare;
-	struct yaffs_tags tags;
-	enum yaffs_ecc_result ecc_result = YAFFS_ECC_RESULT_UNKNOWN;
-	static struct yaffs_spare spare_ff;
-	static int init;
-	int deleted;
-
-	if (!init) {
-		memset(&spare_ff, 0xff, sizeof(spare_ff));
-		init = 1;
-	}
-
-	if (!yaffs_rd_chunk_nand(dev, nand_chunk,
-					data, &spare, &ecc_result, 1))
-		return YAFFS_FAIL;
-
-	/* ext_tags may be NULL */
-	if (!ext_tags)
-		return YAFFS_OK;
-
-	deleted = (hweight8(spare.page_status) < 7) ? 1 : 0;
-
-	ext_tags->is_deleted = deleted;
-	ext_tags->ecc_result = ecc_result;
-	ext_tags->block_bad = 0;	/* We're reading it */
-	/* therefore it is not a bad block */
-	ext_tags->chunk_used =
-		memcmp(&spare_ff, &spare, sizeof(spare_ff)) ? 1 : 0;
-
-	if (ext_tags->chunk_used) {
-		yaffs_get_tags_from_spare(dev, &spare, &tags);
-		ext_tags->obj_id = tags.obj_id;
-		ext_tags->chunk_id = tags.chunk_id;
-		ext_tags->n_bytes = tags.n_bytes_lsb;
-
-		if (dev->data_bytes_per_chunk >= 1024)
-			ext_tags->n_bytes |=
-				(((unsigned)tags.n_bytes_msb) << 10);
-
-		ext_tags->serial_number = tags.serial_number;
-	}
-
-	return YAFFS_OK;
-}
-
-static int yaffs_tags_compat_mark_bad(struct yaffs_dev *dev, int flash_block)
-{
-	struct yaffs_spare spare;
-
-	memset(&spare, 0xff, sizeof(struct yaffs_spare));
-
-	spare.block_status = 'Y';
-
-	yaffs_wr_nand(dev, flash_block * dev->param.chunks_per_block, NULL,
-		      &spare);
-	yaffs_wr_nand(dev, flash_block * dev->param.chunks_per_block + 1,
-		      NULL, &spare);
-
-	return YAFFS_OK;
-}
-
-static int yaffs_tags_compat_query_block(struct yaffs_dev *dev,
-				  int block_no,
-				  enum yaffs_block_state *state,
-				  u32 *seq_number)
-{
-	struct yaffs_spare spare0, spare1;
-	static struct yaffs_spare spare_ff;
-	static int init;
-	enum yaffs_ecc_result dummy;
-
-	if (!init) {
-		memset(&spare_ff, 0xff, sizeof(spare_ff));
-		init = 1;
-	}
-
-	*seq_number = 0;
-
-	/* Look for bad block markers in the first two chunks */
-	yaffs_rd_chunk_nand(dev, block_no * dev->param.chunks_per_block,
-			    NULL, &spare0, &dummy, 0);
-	yaffs_rd_chunk_nand(dev, block_no * dev->param.chunks_per_block + 1,
-			    NULL, &spare1, &dummy, 0);
-
-	if (hweight8(spare0.block_status & spare1.block_status) < 7)
-		*state = YAFFS_BLOCK_STATE_DEAD;
-	else if (memcmp(&spare_ff, &spare0, sizeof(spare_ff)) == 0)
-		*state = YAFFS_BLOCK_STATE_EMPTY;
-	else
-		*state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
-
-	return YAFFS_OK;
-}
-
-void yaffs_tags_compat_install(struct yaffs_dev *dev)
-{
-	if(dev->param.is_yaffs2)
-		return;
-	if(!dev->tagger.write_chunk_tags_fn)
-		dev->tagger.write_chunk_tags_fn = yaffs_tags_compat_wr;
-	if(!dev->tagger.read_chunk_tags_fn)
-		dev->tagger.read_chunk_tags_fn = yaffs_tags_compat_rd;
-	if(!dev->tagger.query_block_fn)
-		dev->tagger.query_block_fn = yaffs_tags_compat_query_block;
-	if(!dev->tagger.mark_bad_fn)
-		dev->tagger.mark_bad_fn = yaffs_tags_compat_mark_bad;
-}

target/linux/generic/files/fs/yaffs2/yaffs_tagscompat.h

@@ -1,44 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License version 2.1 as
- * published by the Free Software Foundation.
- *
- * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
- */
-
-#ifndef __YAFFS_TAGSCOMPAT_H__
-#define __YAFFS_TAGSCOMPAT_H__
-
-
-#include "yaffs_guts.h"
-
-#if 0
-
-
-int yaffs_tags_compat_wr(struct yaffs_dev *dev,
-			 int nand_chunk,
-			 const u8 *data, const struct yaffs_ext_tags *tags);
-int yaffs_tags_compat_rd(struct yaffs_dev *dev,
-			 int nand_chunk,
-			 u8 *data, struct yaffs_ext_tags *tags);
-int yaffs_tags_compat_mark_bad(struct yaffs_dev *dev, int block_no);
-int yaffs_tags_compat_query_block(struct yaffs_dev *dev,
-				  int block_no,
-				  enum yaffs_block_state *state,
-				  u32 *seq_number);
-
-#endif
-
-
-void yaffs_tags_compat_install(struct yaffs_dev *dev);
-void yaffs_calc_tags_ecc(struct yaffs_tags *tags);
-int yaffs_check_tags_ecc(struct yaffs_tags *tags);
-
-#endif

target/linux/generic/files/fs/yaffs2/yaffs_tagsmarshall.c

@@ -1,199 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include "yaffs_guts.h"
-#include "yaffs_trace.h"
-#include "yaffs_packedtags2.h"
-
-static int yaffs_tags_marshall_write(struct yaffs_dev *dev,
-				    int nand_chunk, const u8 *data,
-				    const struct yaffs_ext_tags *tags)
-{
-	struct yaffs_packed_tags2 pt;
-	int retval;
-
-	int packed_tags_size =
-	    dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
-	void *packed_tags_ptr =
-	    dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt;
-
-	yaffs_trace(YAFFS_TRACE_MTD,
-		"yaffs_tags_marshall_write chunk %d data %p tags %p",
-		nand_chunk, data, tags);
-
-	/* For yaffs2 writing there must be both data and tags.
-	 * If we're using inband tags, then the tags are stuffed into
-	 * the end of the data buffer.
-	 */
-	if (!data || !tags)
-		BUG();
-	else if (dev->param.inband_tags) {
-		struct yaffs_packed_tags2_tags_only *pt2tp;
-		pt2tp =
-		    (struct yaffs_packed_tags2_tags_only *)(data +
-							dev->
-							data_bytes_per_chunk);
-		yaffs_pack_tags2_tags_only(pt2tp, tags);
-	} else {
-		yaffs_pack_tags2(&pt, tags, !dev->param.no_tags_ecc);
-	}
-
-	retval = dev->drv.drv_write_chunk_fn(dev, nand_chunk,
-			data, dev->param.total_bytes_per_chunk,
-			(dev->param.inband_tags) ? NULL : packed_tags_ptr,
-			(dev->param.inband_tags) ? 0 : packed_tags_size);
-
-	return retval;
-}
-
-static int yaffs_tags_marshall_read(struct yaffs_dev *dev,
-				   int nand_chunk, u8 *data,
-				   struct yaffs_ext_tags *tags)
-{
-	int retval = 0;
-	int local_data = 0;
-	u8 spare_buffer[100];
-	enum yaffs_ecc_result ecc_result;
-
-	struct yaffs_packed_tags2 pt;
-
-	int packed_tags_size =
-	    dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
-	void *packed_tags_ptr =
-	    dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt;
-
-	yaffs_trace(YAFFS_TRACE_MTD,
-		"yaffs_tags_marshall_read chunk %d data %p tags %p",
-		nand_chunk, data, tags);
-
-	if (dev->param.inband_tags) {
-		if (!data) {
-			local_data = 1;
-			data = yaffs_get_temp_buffer(dev);
-		}
-	}
-
-	if (dev->param.inband_tags || (data && !tags))
-		retval = dev->drv.drv_read_chunk_fn(dev, nand_chunk,
-					data, dev->param.total_bytes_per_chunk,
-					NULL, 0,
-					&ecc_result);
-	else if (tags)
-		retval = dev->drv.drv_read_chunk_fn(dev, nand_chunk,
-					data, dev->param.total_bytes_per_chunk,
-					spare_buffer, packed_tags_size,
-					&ecc_result);
-	else
-		BUG();
-
-
-	if (dev->param.inband_tags) {
-		if (tags) {
-			struct yaffs_packed_tags2_tags_only *pt2tp;
-			pt2tp =
-				(struct yaffs_packed_tags2_tags_only *)
-				&data[dev->data_bytes_per_chunk];
-			yaffs_unpack_tags2_tags_only(tags, pt2tp);
-		}
-	} else if (tags) {
-		memcpy(packed_tags_ptr, spare_buffer, packed_tags_size);
-		yaffs_unpack_tags2(tags, &pt, !dev->param.no_tags_ecc);
-	}
-
-	if (local_data)
-		yaffs_release_temp_buffer(dev, data);
-
-	if (tags && ecc_result == YAFFS_ECC_RESULT_UNFIXED) {
-		tags->ecc_result = YAFFS_ECC_RESULT_UNFIXED;
-		dev->n_ecc_unfixed++;
-	}
-
-	if (tags && ecc_result == -YAFFS_ECC_RESULT_FIXED) {
-		if (tags->ecc_result <= YAFFS_ECC_RESULT_NO_ERROR)
-			tags->ecc_result = YAFFS_ECC_RESULT_FIXED;
-		dev->n_ecc_fixed++;
-	}
-
-	if (ecc_result < YAFFS_ECC_RESULT_UNFIXED)
-		return YAFFS_OK;
-	else
-		return YAFFS_FAIL;
-}
-
-static int yaffs_tags_marshall_query_block(struct yaffs_dev *dev, int block_no,
-			       enum yaffs_block_state *state,
-			       u32 *seq_number)
-{
-	int retval;
-
-	yaffs_trace(YAFFS_TRACE_MTD, "yaffs_tags_marshall_query_block %d",
-			block_no);
-
-	retval = dev->drv.drv_check_bad_fn(dev, block_no);
-
-	if (retval== YAFFS_FAIL) {
-		yaffs_trace(YAFFS_TRACE_MTD, "block is bad");
-
-		*state = YAFFS_BLOCK_STATE_DEAD;
-		*seq_number = 0;
-	} else {
-		struct yaffs_ext_tags t;
-
-		yaffs_tags_marshall_read(dev,
-				    block_no * dev->param.chunks_per_block,
-				    NULL, &t);
-
-		if (t.chunk_used) {
-			*seq_number = t.seq_number;
-			*state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
-		} else {
-			*seq_number = 0;
-			*state = YAFFS_BLOCK_STATE_EMPTY;
-		}
-	}
-
-	yaffs_trace(YAFFS_TRACE_MTD,
-		"block query returns  seq %d state %d",
-		*seq_number, *state);
-
-	if (retval == 0)
-		return YAFFS_OK;
-	else
-		return YAFFS_FAIL;
-}
-
-static int yaffs_tags_marshall_mark_bad(struct yaffs_dev *dev, int block_no)
-{
-	return dev->drv.drv_mark_bad_fn(dev, block_no);
-
-}
-
-
-void yaffs_tags_marshall_install(struct yaffs_dev *dev)
-{
-	if (!dev->param.is_yaffs2)
-		return;
-
-	if (!dev->tagger.write_chunk_tags_fn)
-		dev->tagger.write_chunk_tags_fn = yaffs_tags_marshall_write;
-
-	if (!dev->tagger.read_chunk_tags_fn)
-		dev->tagger.read_chunk_tags_fn = yaffs_tags_marshall_read;
-
-	if (!dev->tagger.query_block_fn)
-		dev->tagger.query_block_fn = yaffs_tags_marshall_query_block;
-
-	if (!dev->tagger.mark_bad_fn)
-		dev->tagger.mark_bad_fn = yaffs_tags_marshall_mark_bad;
-
-}

target/linux/generic/files/fs/yaffs2/yaffs_tagsmarshall.h

@@ -1,22 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License version 2.1 as
- * published by the Free Software Foundation.
- *
- * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
- */
-
-#ifndef __YAFFS_TAGSMARSHALL_H__
-#define __YAFFS_TAGSMARSHALL_H__
-
-#include "yaffs_guts.h"
-void yaffs_tags_marshall_install(struct yaffs_dev *dev);
-
-#endif

target/linux/generic/files/fs/yaffs2/yaffs_trace.h

@@ -1,57 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License version 2.1 as
- * published by the Free Software Foundation.
- *
- * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
- */
-
-#ifndef __YTRACE_H__
-#define __YTRACE_H__
-
-extern unsigned int yaffs_trace_mask;
-extern unsigned int yaffs_wr_attempts;
-
-/*
- * Tracing flags.
- * The flags masked in YAFFS_TRACE_ALWAYS are always traced.
- */
-
-#define YAFFS_TRACE_OS			0x00000002
-#define YAFFS_TRACE_ALLOCATE		0x00000004
-#define YAFFS_TRACE_SCAN		0x00000008
-#define YAFFS_TRACE_BAD_BLOCKS		0x00000010
-#define YAFFS_TRACE_ERASE		0x00000020
-#define YAFFS_TRACE_GC			0x00000040
-#define YAFFS_TRACE_WRITE		0x00000080
-#define YAFFS_TRACE_TRACING		0x00000100
-#define YAFFS_TRACE_DELETION		0x00000200
-#define YAFFS_TRACE_BUFFERS		0x00000400
-#define YAFFS_TRACE_NANDACCESS		0x00000800
-#define YAFFS_TRACE_GC_DETAIL		0x00001000
-#define YAFFS_TRACE_SCAN_DEBUG		0x00002000
-#define YAFFS_TRACE_MTD			0x00004000
-#define YAFFS_TRACE_CHECKPOINT		0x00008000
-
-#define YAFFS_TRACE_VERIFY		0x00010000
-#define YAFFS_TRACE_VERIFY_NAND		0x00020000
-#define YAFFS_TRACE_VERIFY_FULL		0x00040000
-#define YAFFS_TRACE_VERIFY_ALL		0x000f0000
-
-#define YAFFS_TRACE_SYNC		0x00100000
-#define YAFFS_TRACE_BACKGROUND		0x00200000
-#define YAFFS_TRACE_LOCK		0x00400000
-#define YAFFS_TRACE_MOUNT		0x00800000
-
-#define YAFFS_TRACE_ERROR		0x40000000
-#define YAFFS_TRACE_BUG			0x80000000
-#define YAFFS_TRACE_ALWAYS		0xf0000000
-
-#endif

target/linux/generic/files/fs/yaffs2/yaffs_verify.c

@@ -1,529 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include "yaffs_verify.h"
-#include "yaffs_trace.h"
-#include "yaffs_bitmap.h"
-#include "yaffs_getblockinfo.h"
-#include "yaffs_nand.h"
-
-int yaffs_skip_verification(struct yaffs_dev *dev)
-{
-	(void) dev;
-	return !(yaffs_trace_mask &
-		 (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
-}
-
-static int yaffs_skip_full_verification(struct yaffs_dev *dev)
-{
-	(void) dev;
-	return !(yaffs_trace_mask & (YAFFS_TRACE_VERIFY_FULL));
-}
-
-static int yaffs_skip_nand_verification(struct yaffs_dev *dev)
-{
-	(void) dev;
-	return !(yaffs_trace_mask & (YAFFS_TRACE_VERIFY_NAND));
-}
-
-static const char * const block_state_name[] = {
-	"Unknown",
-	"Needs scan",
-	"Scanning",
-	"Empty",
-	"Allocating",
-	"Full",
-	"Dirty",
-	"Checkpoint",
-	"Collecting",
-	"Dead"
-};
-
-void yaffs_verify_blk(struct yaffs_dev *dev, struct yaffs_block_info *bi, int n)
-{
-	int actually_used;
-	int in_use;
-
-	if (yaffs_skip_verification(dev))
-		return;
-
-	/* Report illegal runtime states */
-	if (bi->block_state >= YAFFS_NUMBER_OF_BLOCK_STATES)
-		yaffs_trace(YAFFS_TRACE_VERIFY,
-			"Block %d has undefined state %d",
-			n, bi->block_state);
-
-	switch (bi->block_state) {
-	case YAFFS_BLOCK_STATE_UNKNOWN:
-	case YAFFS_BLOCK_STATE_SCANNING:
-	case YAFFS_BLOCK_STATE_NEEDS_SCAN:
-		yaffs_trace(YAFFS_TRACE_VERIFY,
-			"Block %d has bad run-state %s",
-			n, block_state_name[bi->block_state]);
-	}
-
-	/* Check pages in use and soft deletions are legal */
-
-	actually_used = bi->pages_in_use - bi->soft_del_pages;
-
-	if (bi->pages_in_use < 0 ||
-	    bi->pages_in_use > dev->param.chunks_per_block ||
-	    bi->soft_del_pages < 0 ||
-	    bi->soft_del_pages > dev->param.chunks_per_block ||
-	    actually_used < 0 || actually_used > dev->param.chunks_per_block)
-		yaffs_trace(YAFFS_TRACE_VERIFY,
-			"Block %d has illegal values pages_in_used %d soft_del_pages %d",
-			n, bi->pages_in_use, bi->soft_del_pages);
-
-	/* Check chunk bitmap legal */
-	in_use = yaffs_count_chunk_bits(dev, n);
-	if (in_use != bi->pages_in_use)
-		yaffs_trace(YAFFS_TRACE_VERIFY,
-			"Block %d has inconsistent values pages_in_use %d counted chunk bits %d",
-			n, bi->pages_in_use, in_use);
-}
-
-void yaffs_verify_collected_blk(struct yaffs_dev *dev,
-				struct yaffs_block_info *bi, int n)
-{
-	yaffs_verify_blk(dev, bi, n);
-
-	/* After collection the block should be in the erased state */
-
-	if (bi->block_state != YAFFS_BLOCK_STATE_COLLECTING &&
-	    bi->block_state != YAFFS_BLOCK_STATE_EMPTY) {
-		yaffs_trace(YAFFS_TRACE_ERROR,
-			"Block %d is in state %d after gc, should be erased",
-			n, bi->block_state);
-	}
-}
-
-void yaffs_verify_blocks(struct yaffs_dev *dev)
-{
-	int i;
-	int state_count[YAFFS_NUMBER_OF_BLOCK_STATES];
-	int illegal_states = 0;
-
-	if (yaffs_skip_verification(dev))
-		return;
-
-	memset(state_count, 0, sizeof(state_count));
-
-	for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
-		struct yaffs_block_info *bi = yaffs_get_block_info(dev, i);
-		yaffs_verify_blk(dev, bi, i);
-
-		if (bi->block_state < YAFFS_NUMBER_OF_BLOCK_STATES)
-			state_count[bi->block_state]++;
-		else
-			illegal_states++;
-	}
-
-	yaffs_trace(YAFFS_TRACE_VERIFY,	"Block summary");
-
-	yaffs_trace(YAFFS_TRACE_VERIFY,
-		"%d blocks have illegal states",
-		illegal_states);
-	if (state_count[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
-		yaffs_trace(YAFFS_TRACE_VERIFY,
-			"Too many allocating blocks");
-
-	for (i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
-		yaffs_trace(YAFFS_TRACE_VERIFY,
-			"%s %d blocks",
-			block_state_name[i], state_count[i]);
-
-	if (dev->blocks_in_checkpt != state_count[YAFFS_BLOCK_STATE_CHECKPOINT])
-		yaffs_trace(YAFFS_TRACE_VERIFY,
-			"Checkpoint block count wrong dev %d count %d",
-			dev->blocks_in_checkpt,
-			state_count[YAFFS_BLOCK_STATE_CHECKPOINT]);
-
-	if (dev->n_erased_blocks != state_count[YAFFS_BLOCK_STATE_EMPTY])
-		yaffs_trace(YAFFS_TRACE_VERIFY,
-			"Erased block count wrong dev %d count %d",
-			dev->n_erased_blocks,
-			state_count[YAFFS_BLOCK_STATE_EMPTY]);
-
-	if (state_count[YAFFS_BLOCK_STATE_COLLECTING] > 1)
-		yaffs_trace(YAFFS_TRACE_VERIFY,
-			"Too many collecting blocks %d (max is 1)",
-			state_count[YAFFS_BLOCK_STATE_COLLECTING]);
-}
-
-/*
- * Verify the object header. oh must be valid, but obj and tags may be NULL in
- * which case those tests will not be performed.
- */
-void yaffs_verify_oh(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh,
-		     struct yaffs_ext_tags *tags, int parent_check)
-{
-	if (obj && yaffs_skip_verification(obj->my_dev))
-		return;
-
-	if (!(tags && obj && oh)) {
-		yaffs_trace(YAFFS_TRACE_VERIFY,
-			"Verifying object header tags %p obj %p oh %p",
-			tags, obj, oh);
-		return;
-	}
-
-	if (oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
-	    oh->type > YAFFS_OBJECT_TYPE_MAX)
-		yaffs_trace(YAFFS_TRACE_VERIFY,
-			"Obj %d header type is illegal value 0x%x",
-			tags->obj_id, oh->type);
-
-	if (tags->obj_id != obj->obj_id)
-		yaffs_trace(YAFFS_TRACE_VERIFY,
-			"Obj %d header mismatch obj_id %d",
-			tags->obj_id, obj->obj_id);
-
-	/*
-	 * Check that the object's parent ids match if parent_check requested.
-	 *
-	 * Tests do not apply to the root object.
-	 */
-
-	if (parent_check && tags->obj_id > 1 && !obj->parent)
-		yaffs_trace(YAFFS_TRACE_VERIFY,
-			"Obj %d header mismatch parent_id %d obj->parent is NULL",
-			tags->obj_id, oh->parent_obj_id);
-
-	if (parent_check && obj->parent &&
-	    oh->parent_obj_id != obj->parent->obj_id &&
-	    (oh->parent_obj_id != YAFFS_OBJECTID_UNLINKED ||
-	     obj->parent->obj_id != YAFFS_OBJECTID_DELETED))
-		yaffs_trace(YAFFS_TRACE_VERIFY,
-			"Obj %d header mismatch parent_id %d parent_obj_id %d",
-			tags->obj_id, oh->parent_obj_id,
-			obj->parent->obj_id);
-
-	if (tags->obj_id > 1 && oh->name[0] == 0)	/* Null name */
-		yaffs_trace(YAFFS_TRACE_VERIFY,
-			"Obj %d header name is NULL",
-			obj->obj_id);
-
-	if (tags->obj_id > 1 && ((u8) (oh->name[0])) == 0xff)	/* Junk name */
-		yaffs_trace(YAFFS_TRACE_VERIFY,
-			"Obj %d header name is 0xff",
-			obj->obj_id);
-}
-
-void yaffs_verify_file(struct yaffs_obj *obj)
-{
-	u32 x;
-	int required_depth;
-	int actual_depth;
-	int last_chunk;
-	u32 offset_in_chunk;
-	u32 the_chunk;
-
-	u32 i;
-	struct yaffs_dev *dev;
-	struct yaffs_ext_tags tags;
-	struct yaffs_tnode *tn;
-	u32 obj_id;
-
-	if (!obj)
-		return;
-
-	if (yaffs_skip_verification(obj->my_dev))
-		return;
-
-	dev = obj->my_dev;
-	obj_id = obj->obj_id;
-
-
-	/* Check file size is consistent with tnode depth */
-	yaffs_addr_to_chunk(dev, obj->variant.file_variant.file_size,
-				&last_chunk, &offset_in_chunk);
-	last_chunk++;
-	x = last_chunk >> YAFFS_TNODES_LEVEL0_BITS;
-	required_depth = 0;
-	while (x > 0) {
-		x >>= YAFFS_TNODES_INTERNAL_BITS;
-		required_depth++;
-	}
-
-	actual_depth = obj->variant.file_variant.top_level;
-
-	/* Check that the chunks in the tnode tree are all correct.
-	 * We do this by scanning through the tnode tree and
-	 * checking the tags for every chunk match.
-	 */
-
-	if (yaffs_skip_nand_verification(dev))
-		return;
-
-	for (i = 1; i <= last_chunk; i++) {
-		tn = yaffs_find_tnode_0(dev, &obj->variant.file_variant, i);
-
-		if (!tn)
-			continue;
-
-		the_chunk = yaffs_get_group_base(dev, tn, i);
-		if (the_chunk > 0) {
-			yaffs_rd_chunk_tags_nand(dev, the_chunk, NULL,
-						 &tags);
-			if (tags.obj_id != obj_id || tags.chunk_id != i)
-				yaffs_trace(YAFFS_TRACE_VERIFY,
-					"Object %d chunk_id %d NAND mismatch chunk %d tags (%d:%d)",
-					obj_id, i, the_chunk,
-					tags.obj_id, tags.chunk_id);
-		}
-	}
-}
-
-void yaffs_verify_link(struct yaffs_obj *obj)
-{
-	if (obj && yaffs_skip_verification(obj->my_dev))
-		return;
-
-	/* Verify sane equivalent object */
-}
-
-void yaffs_verify_symlink(struct yaffs_obj *obj)
-{
-	if (obj && yaffs_skip_verification(obj->my_dev))
-		return;
-
-	/* Verify symlink string */
-}
-
-void yaffs_verify_special(struct yaffs_obj *obj)
-{
-	if (obj && yaffs_skip_verification(obj->my_dev))
-		return;
-}
-
-void yaffs_verify_obj(struct yaffs_obj *obj)
-{
-	struct yaffs_dev *dev;
-	u32 chunk_min;
-	u32 chunk_max;
-	u32 chunk_id_ok;
-	u32 chunk_in_range;
-	u32 chunk_wrongly_deleted;
-	u32 chunk_valid;
-
-	if (!obj)
-		return;
-
-	if (obj->being_created)
-		return;
-
-	dev = obj->my_dev;
-
-	if (yaffs_skip_verification(dev))
-		return;
-
-	/* Check sane object header chunk */
-
-	chunk_min = dev->internal_start_block * dev->param.chunks_per_block;
-	chunk_max =
-	    (dev->internal_end_block + 1) * dev->param.chunks_per_block - 1;
-
-	chunk_in_range = (((unsigned)(obj->hdr_chunk)) >= chunk_min &&
-			  ((unsigned)(obj->hdr_chunk)) <= chunk_max);
-	chunk_id_ok = chunk_in_range || (obj->hdr_chunk == 0);
-	chunk_valid = chunk_in_range &&
-	    yaffs_check_chunk_bit(dev,
-				  obj->hdr_chunk / dev->param.chunks_per_block,
-				  obj->hdr_chunk % dev->param.chunks_per_block);
-	chunk_wrongly_deleted = chunk_in_range && !chunk_valid;
-
-	if (!obj->fake && (!chunk_id_ok || chunk_wrongly_deleted))
-		yaffs_trace(YAFFS_TRACE_VERIFY,
-			"Obj %d has chunk_id %d %s %s",
-			obj->obj_id, obj->hdr_chunk,
-			chunk_id_ok ? "" : ",out of range",
-			chunk_wrongly_deleted ? ",marked as deleted" : "");
-
-	if (chunk_valid && !yaffs_skip_nand_verification(dev)) {
-		struct yaffs_ext_tags tags;
-		struct yaffs_obj_hdr *oh;
-		u8 *buffer = yaffs_get_temp_buffer(dev);
-
-		oh = (struct yaffs_obj_hdr *)buffer;
-
-		yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, buffer, &tags);
-
-		yaffs_verify_oh(obj, oh, &tags, 1);
-
-		yaffs_release_temp_buffer(dev, buffer);
-	}
-
-	/* Verify it has a parent */
-	if (obj && !obj->fake && (!obj->parent || obj->parent->my_dev != dev)) {
-		yaffs_trace(YAFFS_TRACE_VERIFY,
-			"Obj %d has parent pointer %p which does not look like an object",
-			obj->obj_id, obj->parent);
-	}
-
-	/* Verify parent is a directory */
-	if (obj->parent &&
-	    obj->parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
-		yaffs_trace(YAFFS_TRACE_VERIFY,
-			"Obj %d's parent is not a directory (type %d)",
-			obj->obj_id, obj->parent->variant_type);
-	}
-
-	switch (obj->variant_type) {
-	case YAFFS_OBJECT_TYPE_FILE:
-		yaffs_verify_file(obj);
-		break;
-	case YAFFS_OBJECT_TYPE_SYMLINK:
-		yaffs_verify_symlink(obj);
-		break;
-	case YAFFS_OBJECT_TYPE_DIRECTORY:
-		yaffs_verify_dir(obj);
-		break;
-	case YAFFS_OBJECT_TYPE_HARDLINK:
-		yaffs_verify_link(obj);
-		break;
-	case YAFFS_OBJECT_TYPE_SPECIAL:
-		yaffs_verify_special(obj);
-		break;
-	case YAFFS_OBJECT_TYPE_UNKNOWN:
-	default:
-		yaffs_trace(YAFFS_TRACE_VERIFY,
-			"Obj %d has illegaltype %d",
-		   obj->obj_id, obj->variant_type);
-		break;
-	}
-}
-
-void yaffs_verify_objects(struct yaffs_dev *dev)
-{
-	struct yaffs_obj *obj;
-	int i;
-	struct list_head *lh;
-
-	if (yaffs_skip_verification(dev))
-		return;
-
-	/* Iterate through the objects in each hash entry */
-
-	for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
-		list_for_each(lh, &dev->obj_bucket[i].list) {
-			obj = list_entry(lh, struct yaffs_obj, hash_link);
-			yaffs_verify_obj(obj);
-		}
-	}
-}
-
-void yaffs_verify_obj_in_dir(struct yaffs_obj *obj)
-{
-	struct list_head *lh;
-	struct yaffs_obj *list_obj;
-	int count = 0;
-
-	if (!obj) {
-		yaffs_trace(YAFFS_TRACE_ALWAYS, "No object to verify");
-		BUG();
-		return;
-	}
-
-	if (yaffs_skip_verification(obj->my_dev))
-		return;
-
-	if (!obj->parent) {
-		yaffs_trace(YAFFS_TRACE_ALWAYS, "Object does not have parent");
-		BUG();
-		return;
-	}
-
-	if (obj->parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
-		yaffs_trace(YAFFS_TRACE_ALWAYS, "Parent is not directory");
-		BUG();
-	}
-
-	/* Iterate through the objects in each hash entry */
-
-	list_for_each(lh, &obj->parent->variant.dir_variant.children) {
-		list_obj = list_entry(lh, struct yaffs_obj, siblings);
-		yaffs_verify_obj(list_obj);
-		if (obj == list_obj)
-			count++;
-	}
-
-	if (count != 1) {
-		yaffs_trace(YAFFS_TRACE_ALWAYS,
-			"Object in directory %d times",
-			count);
-		BUG();
-	}
-}
-
-void yaffs_verify_dir(struct yaffs_obj *directory)
-{
-	struct list_head *lh;
-	struct yaffs_obj *list_obj;
-
-	if (!directory) {
-		BUG();
-		return;
-	}
-
-	if (yaffs_skip_full_verification(directory->my_dev))
-		return;
-
-	if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
-		yaffs_trace(YAFFS_TRACE_ALWAYS,
-			"Directory has wrong type: %d",
-			directory->variant_type);
-		BUG();
-	}
-
-	/* Iterate through the objects in each hash entry */
-
-	list_for_each(lh, &directory->variant.dir_variant.children) {
-		list_obj = list_entry(lh, struct yaffs_obj, siblings);
-		if (list_obj->parent != directory) {
-			yaffs_trace(YAFFS_TRACE_ALWAYS,
-				"Object in directory list has wrong parent %p",
-				list_obj->parent);
-			BUG();
-		}
-		yaffs_verify_obj_in_dir(list_obj);
-	}
-}
-
-static int yaffs_free_verification_failures;
-
-void yaffs_verify_free_chunks(struct yaffs_dev *dev)
-{
-	int counted;
-	int difference;
-
-	if (yaffs_skip_verification(dev))
-		return;
-
-	counted = yaffs_count_free_chunks(dev);
-
-	difference = dev->n_free_chunks - counted;
-
-	if (difference) {
-		yaffs_trace(YAFFS_TRACE_ALWAYS,
-			"Freechunks verification failure %d %d %d",
-			dev->n_free_chunks, counted, difference);
-		yaffs_free_verification_failures++;
-	}
-}
-
-int yaffs_verify_file_sane(struct yaffs_obj *in)
-{
-	(void) in;
-	return YAFFS_OK;
-}

target/linux/generic/files/fs/yaffs2/yaffs_verify.h

@@ -1,43 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License version 2.1 as
- * published by the Free Software Foundation.
- *
- * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
- */
-
-#ifndef __YAFFS_VERIFY_H__
-#define __YAFFS_VERIFY_H__
-
-#include "yaffs_guts.h"
-
-void yaffs_verify_blk(struct yaffs_dev *dev, struct yaffs_block_info *bi,
-		      int n);
-void yaffs_verify_collected_blk(struct yaffs_dev *dev,
-				struct yaffs_block_info *bi, int n);
-void yaffs_verify_blocks(struct yaffs_dev *dev);
-
-void yaffs_verify_oh(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh,
-		     struct yaffs_ext_tags *tags, int parent_check);
-void yaffs_verify_file(struct yaffs_obj *obj);
-void yaffs_verify_link(struct yaffs_obj *obj);
-void yaffs_verify_symlink(struct yaffs_obj *obj);
-void yaffs_verify_special(struct yaffs_obj *obj);
-void yaffs_verify_obj(struct yaffs_obj *obj);
-void yaffs_verify_objects(struct yaffs_dev *dev);
-void yaffs_verify_obj_in_dir(struct yaffs_obj *obj);
-void yaffs_verify_dir(struct yaffs_obj *directory);
-void yaffs_verify_free_chunks(struct yaffs_dev *dev);
-
-int yaffs_verify_file_sane(struct yaffs_obj *obj);
-
-int yaffs_skip_verification(struct yaffs_dev *dev);
-
-#endif

target/linux/generic/files/fs/yaffs2/yaffs_vfs.c

@@ -1,3665 +0,0 @@
-/*
- * 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 <[email protected]>
- * Acknowledgements:
- * Luc van OostenRyck for numerous patches.
- * Nick Bane for numerous patches.
- * Nick Bane for 2.5/2.6 integration.
- * Andras Toth for mknod rdev issue.
- * Michael Fischer for finding the problem with inode inconsistency.
- * Some code bodily lifted from JFFS
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-/*
- *
- * This is the file system front-end to YAFFS that hooks it up to
- * the VFS.
- *
- * Special notes:
- * >> 2.4: sb->u.generic_sbp points to the struct yaffs_dev associated with
- *         this superblock
- * >> 2.6: sb->s_fs_info  points to the struct yaffs_dev associated with this
- *         superblock
- * >> inode->u.generic_ip points to the associated struct yaffs_obj.
- */
-
-/*
- * There are two variants of the VFS glue code. This variant should compile
- * for any version of Linux.
- */
-#include <linux/version.h>
-
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 10))
-#define YAFFS_COMPILE_BACKGROUND
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23))
-#define YAFFS_COMPILE_FREEZER
-#endif
-#endif
-
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 28))
-#define YAFFS_COMPILE_EXPORTFS
-#endif
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 35))
-#define YAFFS_USE_SETATTR_COPY
-#define YAFFS_USE_TRUNCATE_SETSIZE
-#endif
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 35))
-#define YAFFS_HAS_EVICT_INODE
-#endif
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
-#define YAFFS_NEW_FOLLOW_LINK 1
-#else
-#define YAFFS_NEW_FOLLOW_LINK 0
-#endif
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 6, 0))
-#define YAFFS_HAS_WRITE_SUPER
-#endif
-
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
-#include <linux/config.h>
-#endif
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/init.h>
-#include <linux/fs.h>
-#include <linux/proc_fs.h>
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 39))
-#include <linux/smp_lock.h>
-#endif
-#include <linux/pagemap.h>
-#include <linux/mtd/mtd.h>
-#include <linux/interrupt.h>
-#include <linux/string.h>
-#include <linux/ctype.h>
-
-#if (YAFFS_NEW_FOLLOW_LINK == 1)
-#include <linux/namei.h>
-#endif
-
-#ifdef YAFFS_COMPILE_EXPORTFS
-#include <linux/exportfs.h>
-#endif
-
-#ifdef YAFFS_COMPILE_BACKGROUND
-#include <linux/kthread.h>
-#include <linux/delay.h>
-#endif
-#ifdef YAFFS_COMPILE_FREEZER
-#include <linux/freezer.h>
-#endif
-
-#include <asm/div64.h>
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-
-#include <linux/statfs.h>
-
-#define UnlockPage(p) unlock_page(p)
-#define Page_Uptodate(page)	test_bit(PG_uptodate, &(page)->flags)
-
-/* FIXME: use sb->s_id instead ? */
-#define yaffs_devname(sb, buf)	bdevname(sb->s_bdev, buf)
-
-#else
-
-#include <linux/locks.h>
-#define	BDEVNAME_SIZE		0
-#define	yaffs_devname(sb, buf)	kdevname(sb->s_dev)
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0))
-/* added NCB 26/5/2006 for 2.4.25-vrs2-tcl1 kernel */
-#define __user
-#endif
-
-#endif
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26))
-#define YPROC_ROOT  (&proc_root)
-#else
-#define YPROC_ROOT  NULL
-#endif
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26))
-#define Y_INIT_TIMER(a)	init_timer(a)
-#else
-#define Y_INIT_TIMER(a)	init_timer_on_stack(a)
-#endif
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 27))
-#define YAFFS_USE_WRITE_BEGIN_END 1
-#else
-#define YAFFS_USE_WRITE_BEGIN_END 0
-#endif
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 6, 0))
-#define YAFFS_SUPER_HAS_DIRTY
-#endif
-
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 2, 0))
-#define set_nlink(inode, count)  do { (inode)->i_nlink = (count); } while(0)
-#endif
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 28))
-static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size)
-{
-	uint64_t result = partition_size;
-	do_div(result, block_size);
-	return (uint32_t) result;
-}
-#else
-#define YCALCBLOCKS(s, b) ((s)/(b))
-#endif
-
-#include <linux/uaccess.h>
-#include <linux/mtd/mtd.h>
-
-#include "yportenv.h"
-#include "yaffs_trace.h"
-#include "yaffs_guts.h"
-#include "yaffs_attribs.h"
-
-#include "yaffs_linux.h"
-
-#include "yaffs_mtdif.h"
-#include "yaffs_packedtags2.h"
-#include "yaffs_getblockinfo.h"
-
-unsigned int yaffs_trace_mask =
-		YAFFS_TRACE_BAD_BLOCKS |
-		YAFFS_TRACE_ALWAYS |
-		0;
-
-unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
-unsigned int yaffs_auto_checkpoint = 1;
-unsigned int yaffs_gc_control = 1;
-unsigned int yaffs_bg_enable = 1;
-unsigned int yaffs_auto_select = 1;
-/* Module Parameters */
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-module_param(yaffs_trace_mask, uint, 0644);
-module_param(yaffs_wr_attempts, uint, 0644);
-module_param(yaffs_auto_checkpoint, uint, 0644);
-module_param(yaffs_gc_control, uint, 0644);
-module_param(yaffs_bg_enable, uint, 0644);
-#else
-MODULE_PARM(yaffs_trace_mask, "i");
-MODULE_PARM(yaffs_wr_attempts, "i");
-MODULE_PARM(yaffs_auto_checkpoint, "i");
-MODULE_PARM(yaffs_gc_control, "i");
-#endif
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25))
-/* use iget and read_inode */
-#define Y_IGET(sb, inum) iget((sb), (inum))
-
-#else
-/* Call local equivalent */
-#define YAFFS_USE_OWN_IGET
-#define Y_IGET(sb, inum) yaffs_iget((sb), (inum))
-
-#endif
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
-#define yaffs_inode_to_obj_lv(iptr) ((iptr)->i_private)
-#else
-#define yaffs_inode_to_obj_lv(iptr) ((iptr)->u.generic_ip)
-#endif
-
-#define yaffs_inode_to_obj(iptr) \
-	((struct yaffs_obj *)(yaffs_inode_to_obj_lv(iptr)))
-#define yaffs_dentry_to_obj(dptr) yaffs_inode_to_obj((dptr)->d_inode)
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-#define yaffs_super_to_dev(sb)	((struct yaffs_dev *)sb->s_fs_info)
-#else
-#define yaffs_super_to_dev(sb)	((struct yaffs_dev *)sb->u.generic_sbp)
-#endif
-
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0))
-#define Y_CLEAR_INODE(i) clear_inode(i)
-#else
-#define Y_CLEAR_INODE(i) end_writeback(i)
-#endif
-
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 12, 0))
-#define YAFFS_USE_DIR_ITERATE
-#endif
-
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,12,0))
-#define YAFFS_NEW_PROCFS
-#include <linux/seq_file.h>
-#endif
-
-
-#define update_dir_time(dir) do {\
-			(dir)->i_ctime = (dir)->i_mtime = CURRENT_TIME; \
-		} while (0)
-
-static void yaffs_fill_inode_from_obj(struct inode *inode,
-				      struct yaffs_obj *obj);
-
-
-static void yaffs_gross_lock(struct yaffs_dev *dev)
-{
-	yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locking %p", current);
-	mutex_lock(&(yaffs_dev_to_lc(dev)->gross_lock));
-	yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locked %p", current);
-}
-
-static void yaffs_gross_unlock(struct yaffs_dev *dev)
-{
-	yaffs_trace(YAFFS_TRACE_LOCK, "yaffs unlocking %p", current);
-	mutex_unlock(&(yaffs_dev_to_lc(dev)->gross_lock));
-}
-
-
-static int yaffs_readpage_nolock(struct file *f, struct page *pg)
-{
-	/* Lifted from jffs2 */
-
-	struct yaffs_obj *obj;
-	unsigned char *pg_buf;
-	int ret;
-	loff_t pos = ((loff_t) pg->index) << PAGE_CACHE_SHIFT;
-	struct yaffs_dev *dev;
-
-	yaffs_trace(YAFFS_TRACE_OS,
-		"yaffs_readpage_nolock at %lld, size %08x",
-		(long long)pos,
-		(unsigned)PAGE_CACHE_SIZE);
-
-	obj = yaffs_dentry_to_obj(f->f_dentry);
-
-	dev = obj->my_dev;
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-	BUG_ON(!PageLocked(pg));
-#else
-	if (!PageLocked(pg))
-		PAGE_BUG(pg);
-#endif
-
-	pg_buf = kmap(pg);
-	/* FIXME: Can kmap fail? */
-
-	yaffs_gross_lock(dev);
-
-	ret = yaffs_file_rd(obj, pg_buf, pos, PAGE_CACHE_SIZE);
-
-	yaffs_gross_unlock(dev);
-
-	if (ret >= 0)
-		ret = 0;
-
-	if (ret) {
-		ClearPageUptodate(pg);
-		SetPageError(pg);
-	} else {
-		SetPageUptodate(pg);
-		ClearPageError(pg);
-	}
-
-	flush_dcache_page(pg);
-	kunmap(pg);
-
-	yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage_nolock done");
-	return ret;
-}
-
-static int yaffs_readpage_unlock(struct file *f, struct page *pg)
-{
-	int ret = yaffs_readpage_nolock(f, pg);
-	UnlockPage(pg);
-	return ret;
-}
-
-static int yaffs_readpage(struct file *f, struct page *pg)
-{
-	int ret;
-
-	yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage");
-	ret = yaffs_readpage_unlock(f, pg);
-	yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage done");
-	return ret;
-}
-
-
-static void yaffs_set_super_dirty_val(struct yaffs_dev *dev, int val)
-{
-	struct yaffs_linux_context *lc = yaffs_dev_to_lc(dev);
-
-	if (lc)
-		lc->dirty = val;
-
-# ifdef YAFFS_SUPER_HAS_DIRTY
-	{
-		struct super_block *sb = lc->super;
-
-		if (sb)
-			sb->s_dirt = val;
-	}
-#endif
-
-}
-
-static void yaffs_set_super_dirty(struct yaffs_dev *dev)
-{
-	yaffs_set_super_dirty_val(dev, 1);
-}
-
-static void yaffs_clear_super_dirty(struct yaffs_dev *dev)
-{
-	yaffs_set_super_dirty_val(dev, 0);
-}
-
-static int yaffs_check_super_dirty(struct yaffs_dev *dev)
-{
-	struct yaffs_linux_context *lc = yaffs_dev_to_lc(dev);
-
-	if (lc && lc->dirty)
-		return 1;
-
-# ifdef YAFFS_SUPER_HAS_DIRTY
-	{
-		struct super_block *sb = lc->super;
-
-		if (sb && sb->s_dirt)
-			return 1;
-	}
-#endif
-	return 0;
-
-}
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
-#else
-static int yaffs_writepage(struct page *page)
-#endif
-{
-	struct yaffs_dev *dev;
-	struct address_space *mapping = page->mapping;
-	struct inode *inode;
-	unsigned long end_index;
-	char *buffer;
-	struct yaffs_obj *obj;
-	int n_written = 0;
-	unsigned n_bytes;
-	loff_t i_size;
-
-	if (!mapping)
-		BUG();
-	inode = mapping->host;
-	if (!inode)
-		BUG();
-	i_size = i_size_read(inode);
-
-	end_index = i_size >> PAGE_CACHE_SHIFT;
-
-	if (page->index < end_index)
-		n_bytes = PAGE_CACHE_SIZE;
-	else {
-		n_bytes = i_size & (PAGE_CACHE_SIZE - 1);
-
-		if (page->index > end_index || !n_bytes) {
-			yaffs_trace(YAFFS_TRACE_OS,
-				"yaffs_writepage at %lld, inode size = %lld!!",
-				((loff_t)page->index) << PAGE_CACHE_SHIFT,
-				inode->i_size);
-			yaffs_trace(YAFFS_TRACE_OS,
-				"                -> don't care!!");
-
-			zero_user_segment(page, 0, PAGE_CACHE_SIZE);
-			set_page_writeback(page);
-			unlock_page(page);
-			end_page_writeback(page);
-			return 0;
-		}
-	}
-
-	if (n_bytes != PAGE_CACHE_SIZE)
-		zero_user_segment(page, n_bytes, PAGE_CACHE_SIZE);
-
-	get_page(page);
-
-	buffer = kmap(page);
-
-	obj = yaffs_inode_to_obj(inode);
-	dev = obj->my_dev;
-	yaffs_gross_lock(dev);
-
-	yaffs_trace(YAFFS_TRACE_OS,
-		"yaffs_writepage at %lld, size %08x",
-		((loff_t)page->index) << PAGE_CACHE_SHIFT, n_bytes);
-	yaffs_trace(YAFFS_TRACE_OS,
-		"writepag0: obj = %lld, ino = %lld",
-		obj->variant.file_variant.file_size, inode->i_size);
-
-	n_written = yaffs_wr_file(obj, buffer,
-				  ((loff_t)page->index) << PAGE_CACHE_SHIFT, n_bytes, 0);
-
-	yaffs_set_super_dirty(dev);
-
-	yaffs_trace(YAFFS_TRACE_OS,
-		"writepag1: obj = %lld, ino = %lld",
-		obj->variant.file_variant.file_size, inode->i_size);
-
-	yaffs_gross_unlock(dev);
-
-	kunmap(page);
-	set_page_writeback(page);
-	unlock_page(page);
-	end_page_writeback(page);
-	put_page(page);
-
-	return (n_written == n_bytes) ? 0 : -ENOSPC;
-}
-
-/* Space holding and freeing is done to ensure we have space available for write_begin/end */
-/* For now we just assume few parallel writes and check against a small number. */
-/* Todo: need to do this with a counter to handle parallel reads better */
-
-static ssize_t yaffs_hold_space(struct file *f)
-{
-	struct yaffs_obj *obj;
-	struct yaffs_dev *dev;
-
-	int n_free_chunks;
-
-	obj = yaffs_dentry_to_obj(f->f_dentry);
-
-	dev = obj->my_dev;
-
-	yaffs_gross_lock(dev);
-
-	n_free_chunks = yaffs_get_n_free_chunks(dev);
-
-	yaffs_gross_unlock(dev);
-
-	return (n_free_chunks > 20) ? 1 : 0;
-}
-
-static void yaffs_release_space(struct file *f)
-{
-	struct yaffs_obj *obj;
-	struct yaffs_dev *dev;
-
-	obj = yaffs_dentry_to_obj(f->f_dentry);
-
-	dev = obj->my_dev;
-
-	yaffs_gross_lock(dev);
-
-	yaffs_gross_unlock(dev);
-}
-
-#if (YAFFS_USE_WRITE_BEGIN_END > 0)
-static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
-			     loff_t pos, unsigned len, unsigned flags,
-			     struct page **pagep, void **fsdata)
-{
-	struct page *pg = NULL;
-	pgoff_t index = pos >> PAGE_CACHE_SHIFT;
-
-	int ret = 0;
-	int space_held = 0;
-
-	/* Get a page */
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 28)
-	pg = grab_cache_page_write_begin(mapping, index, flags);
-#else
-	pg = __grab_cache_page(mapping, index);
-#endif
-
-	*pagep = pg;
-	if (!pg) {
-		ret = -ENOMEM;
-		goto out;
-	}
-	yaffs_trace(YAFFS_TRACE_OS,
-		"start yaffs_write_begin index %d(%x) uptodate %d",
-		(int)index, (int)index, Page_Uptodate(pg) ? 1 : 0);
-
-	/* Get fs space */
-	space_held = yaffs_hold_space(filp);
-
-	if (!space_held) {
-		ret = -ENOSPC;
-		goto out;
-	}
-
-	/* Update page if required */
-
-	if (!Page_Uptodate(pg))
-		ret = yaffs_readpage_nolock(filp, pg);
-
-	if (ret)
-		goto out;
-
-	/* Happy path return */
-	yaffs_trace(YAFFS_TRACE_OS, "end yaffs_write_begin - ok");
-
-	return 0;
-
-out:
-	yaffs_trace(YAFFS_TRACE_OS,
-		"end yaffs_write_begin fail returning %d", ret);
-	if (space_held)
-		yaffs_release_space(filp);
-	if (pg) {
-		unlock_page(pg);
-		page_cache_release(pg);
-	}
-	return ret;
-}
-
-#else
-
-static int yaffs_prepare_write(struct file *f, struct page *pg,
-			       unsigned offset, unsigned to)
-{
-	yaffs_trace(YAFFS_TRACE_OS, "yaffs_prepair_write");
-
-	if (!Page_Uptodate(pg))
-		return yaffs_readpage_nolock(f, pg);
-	return 0;
-}
-#endif
-
-
-static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
-				loff_t * pos)
-{
-	struct yaffs_obj *obj;
-	int n_written;
-	loff_t ipos;
-	struct inode *inode;
-	struct yaffs_dev *dev;
-
-	obj = yaffs_dentry_to_obj(f->f_dentry);
-
-	if (!obj) {
-		yaffs_trace(YAFFS_TRACE_OS,
-			"yaffs_file_write: hey obj is null!");
-                return -EINVAL;
-        }
-
-	dev = obj->my_dev;
-
-	yaffs_gross_lock(dev);
-
-	inode = f->f_dentry->d_inode;
-
-	if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
-		ipos = inode->i_size;
-	else
-		ipos = *pos;
-
-	yaffs_trace(YAFFS_TRACE_OS,
-		"yaffs_file_write about to write writing %u(%x) bytes to object %d at %lld",
-		(unsigned)n, (unsigned)n, obj->obj_id, ipos);
-
-	n_written = yaffs_wr_file(obj, buf, ipos, n, 0);
-
-	yaffs_set_super_dirty(dev);
-
-	yaffs_trace(YAFFS_TRACE_OS,
-		"yaffs_file_write: %d(%x) bytes written",
-		(unsigned)n, (unsigned)n);
-
-	if (n_written > 0) {
-		ipos += n_written;
-		*pos = ipos;
-		if (ipos > inode->i_size) {
-			inode->i_size = ipos;
-			inode->i_blocks = (ipos + 511) >> 9;
-
-			yaffs_trace(YAFFS_TRACE_OS,
-				"yaffs_file_write size updated to %lld bytes, %d blocks",
-				ipos, (int)(inode->i_blocks));
-		}
-
-	}
-	yaffs_gross_unlock(dev);
-	return (n_written == 0) && (n > 0) ? -ENOSPC : n_written;
-}
-
-
-#if (YAFFS_USE_WRITE_BEGIN_END > 0)
-static int yaffs_write_end(struct file *filp, struct address_space *mapping,
-			   loff_t pos, unsigned len, unsigned copied,
-			   struct page *pg, void *fsdadata)
-{
-	int ret = 0;
-	void *addr, *kva;
-	uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1);
-
-	kva = kmap(pg);
-	addr = kva + offset_into_page;
-
-	yaffs_trace(YAFFS_TRACE_OS,
-		"yaffs_write_end addr %p pos %lld n_bytes %d",
-		addr, pos, copied);
-
-	ret = yaffs_file_write(filp, addr, copied, &pos);
-
-	if (ret != copied) {
-		yaffs_trace(YAFFS_TRACE_OS,
-			"yaffs_write_end not same size ret %d  copied %d",
-			ret, copied);
-		SetPageError(pg);
-	}
-
-	kunmap(pg);
-
-	yaffs_release_space(filp);
-	unlock_page(pg);
-	page_cache_release(pg);
-	return ret;
-}
-#else
-
-static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
-			      unsigned to)
-{
-	void *addr, *kva;
-
-	loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
-	int n_bytes = to - offset;
-	int n_written;
-
-	kva = kmap(pg);
-	addr = kva + offset;
-
-	yaffs_trace(YAFFS_TRACE_OS,
-		"yaffs_commit_write addr %p pos %lld n_bytes %d",
-		addr, pos, n_bytes);
-
-	n_written = yaffs_file_write(f, addr, n_bytes, &pos);
-
-	if (n_written != n_bytes) {
-		yaffs_trace(YAFFS_TRACE_OS,
-			"yaffs_commit_write not same size n_written %d  n_bytes %d",
-			n_written, n_bytes);
-		SetPageError(pg);
-	}
-	kunmap(pg);
-
-	yaffs_trace(YAFFS_TRACE_OS,
-		"yaffs_commit_write returning %d",
-		n_written == n_bytes ? 0 : n_written);
-
-	return n_written == n_bytes ? 0 : n_written;
-}
-#endif
-
-static struct address_space_operations yaffs_file_address_operations = {
-	.readpage = yaffs_readpage,
-	.writepage = yaffs_writepage,
-#if (YAFFS_USE_WRITE_BEGIN_END > 0)
-	.write_begin = yaffs_write_begin,
-	.write_end = yaffs_write_end,
-#else
-	.prepare_write = yaffs_prepare_write,
-	.commit_write = yaffs_commit_write,
-#endif
-};
-
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-static int yaffs_file_flush(struct file *file, fl_owner_t id)
-#else
-static int yaffs_file_flush(struct file *file)
-#endif
-{
-	struct yaffs_obj *obj = yaffs_dentry_to_obj(file->f_dentry);
-
-	struct yaffs_dev *dev = obj->my_dev;
-
-	yaffs_trace(YAFFS_TRACE_OS,
-		"yaffs_file_flush object %d (%s)",
-		obj->obj_id,
-		obj->dirty ? "dirty" : "clean");
-
-	yaffs_gross_lock(dev);
-
-	yaffs_flush_file(obj, 1, 0, 0);
-
-	yaffs_gross_unlock(dev);
-
-	return 0;
-}
-
-
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
-static int yaffs_sync_object(struct file *file, loff_t start, loff_t end, int datasync)
-#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
-static int yaffs_sync_object(struct file *file, int datasync)
-#else
-static int yaffs_sync_object(struct file *file, struct dentry *dentry,
-			     int datasync)
-#endif
-{
-	struct yaffs_obj *obj;
-	struct yaffs_dev *dev;
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
-	struct dentry *dentry = file->f_path.dentry;
-#endif
-
-	obj = yaffs_dentry_to_obj(dentry);
-
-	dev = obj->my_dev;
-
-	yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
-		"yaffs_sync_object");
-	yaffs_gross_lock(dev);
-	yaffs_flush_file(obj, 1, datasync, 0);
-	yaffs_gross_unlock(dev);
-	return 0;
-}
-
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 22))
-static const struct file_operations yaffs_file_operations = {
-	.read = do_sync_read,
-	.write = do_sync_write,
-	.aio_read = generic_file_aio_read,
-	.aio_write = generic_file_aio_write,
-	.mmap = generic_file_mmap,
-	.flush = yaffs_file_flush,
-	.fsync = yaffs_sync_object,
-	.splice_read = generic_file_splice_read,
-	.splice_write = generic_file_splice_write,
-	.llseek = generic_file_llseek,
-};
-
-#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
-
-static const struct file_operations yaffs_file_operations = {
-	.read = do_sync_read,
-	.write = do_sync_write,
-	.aio_read = generic_file_aio_read,
-	.aio_write = generic_file_aio_write,
-	.mmap = generic_file_mmap,
-	.flush = yaffs_file_flush,
-	.fsync = yaffs_sync_object,
-	.sendfile = generic_file_sendfile,
-};
-
-#else
-
-static const struct file_operations yaffs_file_operations = {
-	.read = generic_file_read,
-	.write = generic_file_write,
-	.mmap = generic_file_mmap,
-	.flush = yaffs_file_flush,
-	.fsync = yaffs_sync_object,
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-	.sendfile = generic_file_sendfile,
-#endif
-};
-#endif
-
-
-
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25))
-static void zero_user_segment(struct page *page, unsigned start, unsigned end)
-{
-	void *kaddr = kmap_atomic(page, KM_USER0);
-	memset(kaddr + start, 0, end - start);
-	kunmap_atomic(kaddr, KM_USER0);
-	flush_dcache_page(page);
-}
-#endif
-
-
-static int yaffs_vfs_setsize(struct inode *inode, loff_t newsize)
-{
-#ifdef YAFFS_USE_TRUNCATE_SETSIZE
-	truncate_setsize(inode, newsize);
-	return 0;
-#else
-	truncate_inode_pages(&inode->i_data, newsize);
-	return 0;
-#endif
-
-}
-
-
-static int yaffs_vfs_setattr(struct inode *inode, struct iattr *attr)
-{
-#ifdef YAFFS_USE_SETATTR_COPY
-	setattr_copy(inode, attr);
-	return 0;
-#else
-	return inode_setattr(inode, attr);
-#endif
-
-}
-
-static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
-{
-	struct inode *inode = dentry->d_inode;
-	int error = 0;
-	struct yaffs_dev *dev;
-
-	yaffs_trace(YAFFS_TRACE_OS,
-		"yaffs_setattr of object %d",
-		yaffs_inode_to_obj(inode)->obj_id);
-#if 0
-	/* Fail if a requested resize >= 2GB */
-	if (attr->ia_valid & ATTR_SIZE && (attr->ia_size >> 31))
-		error = -EINVAL;
-#endif
-
-	if (error == 0)
-		error = inode_change_ok(inode, attr);
-	if (error == 0) {
-		int result;
-		if (!error) {
-			error = yaffs_vfs_setattr(inode, attr);
-			yaffs_trace(YAFFS_TRACE_OS, "inode_setattr called");
-			if (attr->ia_valid & ATTR_SIZE) {
-				yaffs_vfs_setsize(inode, attr->ia_size);
-				inode->i_blocks = (inode->i_size + 511) >> 9;
-			}
-		}
-		dev = yaffs_inode_to_obj(inode)->my_dev;
-		if (attr->ia_valid & ATTR_SIZE) {
-			yaffs_trace(YAFFS_TRACE_OS,
-				"resize to %d(%x)",
-				(int)(attr->ia_size),
-				(int)(attr->ia_size));
-		}
-		yaffs_gross_lock(dev);
-		result = yaffs_set_attribs(yaffs_inode_to_obj(inode), attr);
-		if (result == YAFFS_OK) {
-			error = 0;
-		} else {
-			error = -EPERM;
-		}
-		yaffs_gross_unlock(dev);
-
-	}
-
-	yaffs_trace(YAFFS_TRACE_OS, "yaffs_setattr done returning %d", error);
-
-	return error;
-}
-
-static int yaffs_setxattr(struct dentry *dentry, const char *name,
-		   const void *value, size_t size, int flags)
-{
-	struct inode *inode = dentry->d_inode;
-	int error = 0;
-	struct yaffs_dev *dev;
-	struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
-
-	yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr of object %d", obj->obj_id);
-
-	if (error == 0) {
-		int result;
-		dev = obj->my_dev;
-		yaffs_gross_lock(dev);
-		result = yaffs_set_xattrib(obj, name, value, size, flags);
-		if (result == YAFFS_OK)
-			error = 0;
-		else if (result < 0)
-			error = result;
-		yaffs_gross_unlock(dev);
-
-	}
-	yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr done returning %d", error);
-
-	return error;
-}
-
-static ssize_t yaffs_getxattr(struct dentry * dentry, const char *name,
-			void *buff, size_t size)
-{
-	struct inode *inode = dentry->d_inode;
-	int error = 0;
-	struct yaffs_dev *dev;
-	struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
-
-	yaffs_trace(YAFFS_TRACE_OS,
-		"yaffs_getxattr \"%s\" from object %d",
-		name, obj->obj_id);
-
-	if (error == 0) {
-		dev = obj->my_dev;
-		yaffs_gross_lock(dev);
-		error = yaffs_get_xattrib(obj, name, buff, size);
-		yaffs_gross_unlock(dev);
-
-	}
-	yaffs_trace(YAFFS_TRACE_OS, "yaffs_getxattr done returning %d", error);
-
-	return error;
-}
-
-static int yaffs_removexattr(struct dentry *dentry, const char *name)
-{
-	struct inode *inode = dentry->d_inode;
-	int error = 0;
-	struct yaffs_dev *dev;
-	struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
-
-	yaffs_trace(YAFFS_TRACE_OS,
-		"yaffs_removexattr of object %d", obj->obj_id);
-
-	if (error == 0) {
-		int result;
-		dev = obj->my_dev;
-		yaffs_gross_lock(dev);
-		result = yaffs_remove_xattrib(obj, name);
-		if (result == YAFFS_OK)
-			error = 0;
-		else if (result < 0)
-			error = result;
-		yaffs_gross_unlock(dev);
-
-	}
-	yaffs_trace(YAFFS_TRACE_OS,
-		"yaffs_removexattr done returning %d", error);
-
-	return error;
-}
-
-static ssize_t yaffs_listxattr(struct dentry * dentry, char *buff, size_t size)
-{
-	struct inode *inode = dentry->d_inode;
-	int error = 0;
-	struct yaffs_dev *dev;
-	struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
-
-	yaffs_trace(YAFFS_TRACE_OS,
-		"yaffs_listxattr of object %d", obj->obj_id);
-
-	if (error == 0) {
-		dev = obj->my_dev;
-		yaffs_gross_lock(dev);
-		error = yaffs_list_xattrib(obj, buff, size);
-		yaffs_gross_unlock(dev);
-
-	}
-	yaffs_trace(YAFFS_TRACE_OS,
-		"yaffs_listxattr done returning %d", error);
-
-	return error;
-}
-
-
-static const struct inode_operations yaffs_file_inode_operations = {
-	.setattr = yaffs_setattr,
-	.setxattr = yaffs_setxattr,
-	.getxattr = yaffs_getxattr,
-	.listxattr = yaffs_listxattr,
-	.removexattr = yaffs_removexattr,
-};
-
-
-static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
-			  int buflen)
-{
-	unsigned char *alias;
-	int ret;
-
-	struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
-
-	yaffs_gross_lock(dev);
-
-	alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
-
-	yaffs_gross_unlock(dev);
-
-	if (!alias)
-		return -ENOMEM;
-
-#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 15, 0)
-	ret = vfs_readlink(dentry, buffer, buflen, alias);
-#else
-	ret = readlink_copy(buffer, buflen, alias);
-#endif
-	kfree(alias);
-	return ret;
-}
-
-#if (YAFFS_NEW_FOLLOW_LINK == 1)
-static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
-{
-	void *ret;
-#else
-static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
-{
-	int ret
-#endif
-	unsigned char *alias;
-	int ret_int = 0;
-	struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
-
-	yaffs_gross_lock(dev);
-
-	alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
-	yaffs_gross_unlock(dev);
-
-	if (!alias) {
-		ret_int = -ENOMEM;
-		goto out;
-	}
-#if (YAFFS_NEW_FOLLOW_LINK == 1)
-	nd_set_link(nd, alias);
-	ret = alias;
-out:
-	if (ret_int)
-		ret = ERR_PTR(ret_int);
-	return ret;
-#else
-	ret = vfs_follow_link(nd, alias);
-	kfree(alias);
-out:
-	if (ret_int)
-		ret = ret_int;
-	return ret;
-#endif
-}
-
-
-#ifdef YAFFS_HAS_PUT_INODE
-
-/* For now put inode is just for debugging
- * Put inode is called when the inode **structure** is put.
- */
-static void yaffs_put_inode(struct inode *inode)
-{
-	yaffs_trace(YAFFS_TRACE_OS,
-		"yaffs_put_inode: ino %d, count %d"),
-		(int)inode->i_ino, atomic_read(&inode->i_count);
-
-}
-#endif
-
-#if (YAFFS_NEW_FOLLOW_LINK == 1)
-void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias)
-{
-	kfree(alias);
-}
-#endif
-
-static const struct inode_operations yaffs_symlink_inode_operations = {
-	.readlink = yaffs_readlink,
-	.follow_link = yaffs_follow_link,
-#if (YAFFS_NEW_FOLLOW_LINK == 1)
-	.put_link = yaffs_put_link,
-#endif
-	.setattr = yaffs_setattr,
-	.setxattr = yaffs_setxattr,
-	.getxattr = yaffs_getxattr,
-	.listxattr = yaffs_listxattr,
-	.removexattr = yaffs_removexattr,
-};
-
-#ifdef YAFFS_USE_OWN_IGET
-
-static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
-{
-	struct inode *inode;
-	struct yaffs_obj *obj;
-	struct yaffs_dev *dev = yaffs_super_to_dev(sb);
-
-	yaffs_trace(YAFFS_TRACE_OS, "yaffs_iget for %lu", ino);
-
-	inode = iget_locked(sb, ino);
-	if (!inode)
-		return ERR_PTR(-ENOMEM);
-	if (!(inode->i_state & I_NEW))
-		return inode;
-
-	/* NB This is called as a side effect of other functions, but
-	 * we had to release the lock to prevent deadlocks, so
-	 * need to lock again.
-	 */
-
-	yaffs_gross_lock(dev);
-
-	obj = yaffs_find_by_number(dev, inode->i_ino);
-
-	yaffs_fill_inode_from_obj(inode, obj);
-
-	yaffs_gross_unlock(dev);
-
-	unlock_new_inode(inode);
-	return inode;
-}
-
-#else
-
-static void yaffs_read_inode(struct inode *inode)
-{
-	/* NB This is called as a side effect of other functions, but
-	 * we had to release the lock to prevent deadlocks, so
-	 * need to lock again.
-	 */
-
-	struct yaffs_obj *obj;
-	struct yaffs_dev *dev = yaffs_super_to_dev(inode->i_sb);
-
-	yaffs_trace(YAFFS_TRACE_OS,
-		"yaffs_read_inode for %d", (int)inode->i_ino);
-
-	if (current != yaffs_dev_to_lc(dev)->readdir_process)
-		yaffs_gross_lock(dev);
-
-	obj = yaffs_find_by_number(dev, inode->i_ino);
-
-	yaffs_fill_inode_from_obj(inode, obj);
-
-	if (current != yaffs_dev_to_lc(dev)->readdir_process)
-		yaffs_gross_unlock(dev);
-}
-
-#endif
-
-
-
-struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
-			      struct yaffs_obj *obj)
-{
-	struct inode *inode;
-
-	if (!sb) {
-		yaffs_trace(YAFFS_TRACE_OS,
-			"yaffs_get_inode for NULL super_block!!");
-		return NULL;
-
-	}
-
-	if (!obj) {
-		yaffs_trace(YAFFS_TRACE_OS,
-			"yaffs_get_inode for NULL object!!");
-		return NULL;
-
-	}
-
-	yaffs_trace(YAFFS_TRACE_OS,
-		"yaffs_get_inode for object %d", obj->obj_id);
-
-	inode = Y_IGET(sb, obj->obj_id);
-	if (IS_ERR(inode))
-		return NULL;
-
-	/* NB Side effect: iget calls back to yaffs_read_inode(). */
-	/* iget also increments the inode's i_count */
-	/* NB You can't be holding gross_lock or deadlock will happen! */
-
-	return inode;
-}
-
-
-
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
-#define YCRED(x) x
-#else
-#define YCRED(x) (x->cred)
-#endif
-
-#if LINUX_VERSION_CODE < KERNEL_VERSION(3,14,0)
-#define YPROC_uid(p) (YCRED(p)->fsuid)
-#define YPROC_gid(p) (YCRED(p)->fsgid)
-#define EXTRACT_gid(x) x
-#define EXTRACT_uid(x) x
-#define MAKE_gid(x) x
-#define MAKE_uid(x) x
-#else
-#define YPROC_uid(p) from_kuid(&init_user_ns, YCRED(p)->fsuid)
-#define YPROC_gid(p) from_kgid(&init_user_ns, YCRED(p)->fsgid)
-#define EXTRACT_gid(x) from_kgid(&init_user_ns, x)
-#define EXTRACT_uid(x) from_kuid(&init_user_ns, x)
-#define MAKE_gid(x) make_kgid(&init_user_ns, x)
-#define MAKE_uid(x) make_kuid(&init_user_ns, x)
-#endif
-
-
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 4, 0))
-static int yaffs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
-		       dev_t rdev)
-#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
-		       dev_t rdev)
-#else
-static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
-		       int rdev)
-#endif
-{
-	struct inode *inode;
-
-	struct yaffs_obj *obj = NULL;
-	struct yaffs_dev *dev;
-
-	struct yaffs_obj *parent = yaffs_inode_to_obj(dir);
-
-	int error = -ENOSPC;
-	uid_t uid = YPROC_uid(current);
-	gid_t gid =
-	    (dir->i_mode & S_ISGID) ? EXTRACT_gid(dir->i_gid) : YPROC_gid(current);
-
-	if ((dir->i_mode & S_ISGID) && S_ISDIR(mode))
-		mode |= S_ISGID;
-
-	if (parent) {
-		yaffs_trace(YAFFS_TRACE_OS,
-			"yaffs_mknod: parent object %d type %d",
-			parent->obj_id, parent->variant_type);
-	} else {
-		yaffs_trace(YAFFS_TRACE_OS,
-			"yaffs_mknod: could not get parent object");
-		return -EPERM;
-	}
-
-	yaffs_trace(YAFFS_TRACE_OS,
-		"yaffs_mknod: making oject for %s, mode %x dev %x",
-		dentry->d_name.name, mode, rdev);
-
-	dev = parent->my_dev;
-
-	yaffs_gross_lock(dev);
-
-	switch (mode & S_IFMT) {
-	default:
-		/* Special (socket, fifo, device...) */
-		yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making special");
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-		obj =
-		    yaffs_create_special(parent, dentry->d_name.name, mode, uid,
-					 gid, old_encode_dev(rdev));
-#else
-		obj =
-		    yaffs_create_special(parent, dentry->d_name.name, mode, uid,
-					 gid, rdev);
-#endif
-		break;
-	case S_IFREG:		/* file          */
-		yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making file");
-		obj = yaffs_create_file(parent, dentry->d_name.name, mode, uid,
-					gid);
-		break;
-	case S_IFDIR:		/* directory */
-		yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making directory");
-		obj = yaffs_create_dir(parent, dentry->d_name.name, mode,
-				       uid, gid);
-		break;
-	case S_IFLNK:		/* symlink */
-		yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making symlink");
-		obj = NULL;	/* Do we ever get here? */
-		break;
-	}
-
-	/* Can not call yaffs_get_inode() with gross lock held */
-	yaffs_gross_unlock(dev);
-
-	if (obj) {
-		inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
-		d_instantiate(dentry, inode);
-		update_dir_time(dir);
-		yaffs_trace(YAFFS_TRACE_OS,
-			"yaffs_mknod created object %d count = %d",
-			obj->obj_id, atomic_read(&inode->i_count));
-		error = 0;
-		yaffs_fill_inode_from_obj(dir, parent);
-	} else {
-		yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod failed making object");
-		error = -ENOMEM;
-	}
-
-	return error;
-}
-
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 4, 0))
-static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
-#else
-static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
-#endif
-{
-	int ret_val;
-	yaffs_trace(YAFFS_TRACE_OS, "yaffs_mkdir");
-	ret_val = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
-	return ret_val;
-}
-
-
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 6, 0))
-static int yaffs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
-			bool dummy)
-#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 4, 0))
-static int yaffs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
-			struct nameidata *n)
-#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
-			struct nameidata *n)
-#else
-static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
-#endif
-{
-	yaffs_trace(YAFFS_TRACE_OS, "yaffs_create");
-	return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
-}
-
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 6, 0))
-static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
-				   unsigned int dummy)
-#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
-				   struct nameidata *n)
-#else
-static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
-#endif
-{
-	struct yaffs_obj *obj;
-	struct inode *inode = NULL;	/* NCB 2.5/2.6 needs NULL here */
-
-	struct yaffs_dev *dev = yaffs_inode_to_obj(dir)->my_dev;
-
-	if (current != yaffs_dev_to_lc(dev)->readdir_process)
-		yaffs_gross_lock(dev);
-
-	yaffs_trace(YAFFS_TRACE_OS, "yaffs_lookup for %d:%s",
-		yaffs_inode_to_obj(dir)->obj_id, dentry->d_name.name);
-
-	obj = yaffs_find_by_name(yaffs_inode_to_obj(dir), dentry->d_name.name);
-
-	obj = yaffs_get_equivalent_obj(obj);	/* in case it was a hardlink */
-
-	/* Can't hold gross lock when calling yaffs_get_inode() */
-	if (current != yaffs_dev_to_lc(dev)->readdir_process)
-		yaffs_gross_unlock(dev);
-
-	if (obj) {
-		yaffs_trace(YAFFS_TRACE_OS,
-			"yaffs_lookup found %d", obj->obj_id);
-
-		inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
-	} else {
-		yaffs_trace(YAFFS_TRACE_OS, "yaffs_lookup not found");
-
-	}
-
-/* added NCB for 2.5/6 compatability - forces add even if inode is
- * NULL which creates dentry hash */
-	d_add(dentry, inode);
-
-	return NULL;
-}
-
-/*
- * Create a link...
- */
-static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
-		      struct dentry *dentry)
-{
-	struct inode *inode = old_dentry->d_inode;
-	struct yaffs_obj *obj = NULL;
-	struct yaffs_obj *link = NULL;
-	struct yaffs_dev *dev;
-
-	yaffs_trace(YAFFS_TRACE_OS, "yaffs_link");
-
-	obj = yaffs_inode_to_obj(inode);
-	dev = obj->my_dev;
-
-	yaffs_gross_lock(dev);
-
-	if (!S_ISDIR(inode->i_mode))	/* Don't link directories */
-		link =
-		    yaffs_link_obj(yaffs_inode_to_obj(dir), dentry->d_name.name,
-				   obj);
-
-	if (link) {
-		set_nlink(old_dentry->d_inode, yaffs_get_obj_link_count(obj));
-		d_instantiate(dentry, old_dentry->d_inode);
-		atomic_inc(&old_dentry->d_inode->i_count);
-		yaffs_trace(YAFFS_TRACE_OS,
-			"yaffs_link link count %d i_count %d",
-			old_dentry->d_inode->i_nlink,
-			atomic_read(&old_dentry->d_inode->i_count));
-	}
-
-	yaffs_gross_unlock(dev);
-
-	if (link) {
-		update_dir_time(dir);
-		return 0;
-	}
-
-	return -EPERM;
-}
-
-static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
-			 const char *symname)
-{
-	struct yaffs_obj *obj;
-	struct yaffs_dev *dev;
-	uid_t uid = YPROC_uid(current);
-	gid_t gid =
-	    (dir->i_mode & S_ISGID) ? EXTRACT_gid(dir->i_gid) : YPROC_gid(current);
-
-	yaffs_trace(YAFFS_TRACE_OS, "yaffs_symlink");
-
-	if (strnlen(dentry->d_name.name, YAFFS_MAX_NAME_LENGTH + 1) >
-				YAFFS_MAX_NAME_LENGTH)
-		return -ENAMETOOLONG;
-
-	if (strnlen(symname, YAFFS_MAX_ALIAS_LENGTH + 1) >
-				YAFFS_MAX_ALIAS_LENGTH)
-		return -ENAMETOOLONG;
-
-	dev = yaffs_inode_to_obj(dir)->my_dev;
-	yaffs_gross_lock(dev);
-	obj = yaffs_create_symlink(yaffs_inode_to_obj(dir), dentry->d_name.name,
-				   S_IFLNK | S_IRWXUGO, uid, gid, symname);
-	yaffs_gross_unlock(dev);
-
-	if (obj) {
-		struct inode *inode;
-
-		inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
-		d_instantiate(dentry, inode);
-		update_dir_time(dir);
-		yaffs_trace(YAFFS_TRACE_OS, "symlink created OK");
-		return 0;
-	} else {
-		yaffs_trace(YAFFS_TRACE_OS, "symlink not created");
-	}
-
-	return -ENOMEM;
-}
-
-/*
- * The VFS layer already does all the dentry stuff for rename.
- *
- * NB: POSIX says you can rename an object over an old object of the same name
- */
-static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
-			struct inode *new_dir, struct dentry *new_dentry)
-{
-	struct yaffs_dev *dev;
-	int ret_val = YAFFS_FAIL;
-	struct yaffs_obj *target;
-
-	yaffs_trace(YAFFS_TRACE_OS, "yaffs_rename");
-	dev = yaffs_inode_to_obj(old_dir)->my_dev;
-
-	yaffs_gross_lock(dev);
-
-	/* Check if the target is an existing directory that is not empty. */
-	target = yaffs_find_by_name(yaffs_inode_to_obj(new_dir),
-				    new_dentry->d_name.name);
-
-	if (target && target->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY &&
-	    !list_empty(&target->variant.dir_variant.children)) {
-
-		yaffs_trace(YAFFS_TRACE_OS, "target is non-empty dir");
-
-		ret_val = YAFFS_FAIL;
-	} else {
-		/* Now does unlinking internally using shadowing mechanism */
-		yaffs_trace(YAFFS_TRACE_OS, "calling yaffs_rename_obj");
-
-		ret_val = yaffs_rename_obj(yaffs_inode_to_obj(old_dir),
-					   old_dentry->d_name.name,
-					   yaffs_inode_to_obj(new_dir),
-					   new_dentry->d_name.name);
-	}
-	yaffs_gross_unlock(dev);
-
-	if (ret_val == YAFFS_OK) {
-		if (target)
-			inode_dec_link_count(new_dentry->d_inode);
-
-		update_dir_time(old_dir);
-		if (old_dir != new_dir)
-			update_dir_time(new_dir);
-		return 0;
-	} else {
-		return -ENOTEMPTY;
-	}
-}
-
-
-
-
-static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
-{
-	int ret_val;
-
-	struct yaffs_dev *dev;
-	struct yaffs_obj *obj;
-
-	yaffs_trace(YAFFS_TRACE_OS, "yaffs_unlink %d:%s",
-		(int)(dir->i_ino), dentry->d_name.name);
-	obj = yaffs_inode_to_obj(dir);
-	dev = obj->my_dev;
-
-	yaffs_gross_lock(dev);
-
-	ret_val = yaffs_unlinker(obj, dentry->d_name.name);
-
-	if (ret_val == YAFFS_OK) {
-		inode_dec_link_count(dentry->d_inode);
-		dir->i_version++;
-		yaffs_gross_unlock(dev);
-		update_dir_time(dir);
-		return 0;
-	}
-	yaffs_gross_unlock(dev);
-	return -ENOTEMPTY;
-}
-
-
-
-static const struct inode_operations yaffs_dir_inode_operations = {
-	.create = yaffs_create,
-	.lookup = yaffs_lookup,
-	.link = yaffs_link,
-	.unlink = yaffs_unlink,
-	.symlink = yaffs_symlink,
-	.mkdir = yaffs_mkdir,
-	.rmdir = yaffs_unlink,
-	.mknod = yaffs_mknod,
-	.rename = yaffs_rename,
-	.setattr = yaffs_setattr,
-	.setxattr = yaffs_setxattr,
-	.getxattr = yaffs_getxattr,
-	.listxattr = yaffs_listxattr,
-	.removexattr = yaffs_removexattr,
-};
-
-/*-----------------------------------------------------------------*/
-/* Directory search context allows us to unlock access to yaffs during
- * filldir without causing problems with the directory being modified.
- * This is similar to the tried and tested mechanism used in yaffs direct.
- *
- * A search context iterates along a doubly linked list of siblings in the
- * directory. If the iterating object is deleted then this would corrupt
- * the list iteration, likely causing a crash. The search context avoids
- * this by using the remove_obj_fn to move the search context to the
- * next object before the object is deleted.
- *
- * Many readdirs (and thus seach conexts) may be alive simulateously so
- * each struct yaffs_dev has a list of these.
- *
- * A seach context lives for the duration of a readdir.
- *
- * All these functions must be called while yaffs is locked.
- */
-
-struct yaffs_search_context {
-	struct yaffs_dev *dev;
-	struct yaffs_obj *dir_obj;
-	struct yaffs_obj *next_return;
-	struct list_head others;
-};
-
-/*
- * yaffs_new_search() creates a new search context, initialises it and
- * adds it to the device's search context list.
- *
- * Called at start of readdir.
- */
-static struct yaffs_search_context *yaffs_new_search(struct yaffs_obj *dir)
-{
-	struct yaffs_dev *dev = dir->my_dev;
-	struct yaffs_search_context *sc =
-	    kmalloc(sizeof(struct yaffs_search_context), GFP_NOFS);
-	if (sc) {
-		sc->dir_obj = dir;
-		sc->dev = dev;
-		if (list_empty(&sc->dir_obj->variant.dir_variant.children))
-			sc->next_return = NULL;
-		else
-			sc->next_return =
-			    list_entry(dir->variant.dir_variant.children.next,
-				       struct yaffs_obj, siblings);
-		INIT_LIST_HEAD(&sc->others);
-		list_add(&sc->others, &(yaffs_dev_to_lc(dev)->search_contexts));
-	}
-	return sc;
-}
-
-/*
- * yaffs_search_end() disposes of a search context and cleans up.
- */
-static void yaffs_search_end(struct yaffs_search_context *sc)
-{
-	if (sc) {
-		list_del(&sc->others);
-		kfree(sc);
-	}
-}
-
-/*
- * yaffs_search_advance() moves a search context to the next object.
- * Called when the search iterates or when an object removal causes
- * the search context to be moved to the next object.
- */
-static void yaffs_search_advance(struct yaffs_search_context *sc)
-{
-	if (!sc)
-		return;
-
-	if (sc->next_return == NULL ||
-	    list_empty(&sc->dir_obj->variant.dir_variant.children))
-		sc->next_return = NULL;
-	else {
-		struct list_head *next = sc->next_return->siblings.next;
-
-		if (next == &sc->dir_obj->variant.dir_variant.children)
-			sc->next_return = NULL;	/* end of list */
-		else
-			sc->next_return =
-			    list_entry(next, struct yaffs_obj, siblings);
-	}
-}
-
-/*
- * yaffs_remove_obj_callback() is called when an object is unlinked.
- * We check open search contexts and advance any which are currently
- * on the object being iterated.
- */
-static void yaffs_remove_obj_callback(struct yaffs_obj *obj)
-{
-
-	struct list_head *i;
-	struct yaffs_search_context *sc;
-	struct list_head *search_contexts =
-	    &(yaffs_dev_to_lc(obj->my_dev)->search_contexts);
-
-	/* Iterate through the directory search contexts.
-	 * If any are currently on the object being removed, then advance
-	 * the search context to the next object to prevent a hanging pointer.
-	 */
-	list_for_each(i, search_contexts) {
-		sc = list_entry(i, struct yaffs_search_context, others);
-		if (sc->next_return == obj)
-			yaffs_search_advance(sc);
-	}
-
-}
-
-
-/*-----------------------------------------------------------------*/
-
-#ifdef YAFFS_USE_DIR_ITERATE
-static int yaffs_iterate(struct file *f, struct dir_context *dc)
-{
-	struct yaffs_obj *obj;
-	struct yaffs_dev *dev;
-	struct yaffs_search_context *sc;
-	unsigned long 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;
-
-	sc = yaffs_new_search(obj);
-	if (!sc) {
-		ret_val = -ENOMEM;
-		goto out;
-	}
-
-	if (!dir_emit_dots(f, dc))
-		return 0;
-
-	curoffs = 1;
-
-	while (sc->next_return) {
-		curoffs++;
-		l = sc->next_return;
-		if (curoffs >= dc->pos) {
-			int this_inode = yaffs_get_obj_inode(l);
-			int this_type = yaffs_get_obj_type(l);
-
-			yaffs_get_obj_name(l, name, YAFFS_MAX_NAME_LENGTH + 1);
-			yaffs_trace(YAFFS_TRACE_OS,
-				"yaffs_readdir: %s inode %d",
-				name, yaffs_get_obj_inode(l));
-
-			yaffs_gross_unlock(dev);
-
-			if (!dir_emit(dc,
-				      name,
-				      strlen(name),
-				      this_inode,
-				      this_type)) {
-				yaffs_gross_lock(dev);
-				goto out;
-			}
-
-			yaffs_gross_lock(dev);
-
-			dc->pos++;
-			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;
-}
-
-#else
-
-static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
-{
-	struct yaffs_obj *obj;
-	struct yaffs_dev *dev;
-	struct yaffs_search_context *sc;
-	struct inode *inode = f->f_dentry->d_inode;
-	unsigned long offset, curoffs;
-	struct yaffs_obj *l;
-	int ret_val = 0;
-
-	char name[YAFFS_MAX_NAME_LENGTH + 1];
-
-	obj = yaffs_dentry_to_obj(f->f_dentry);
-	dev = obj->my_dev;
-
-	yaffs_gross_lock(dev);
-
-	yaffs_dev_to_lc(dev)->readdir_process = current;
-
-	offset = f->f_pos;
-
-	sc = yaffs_new_search(obj);
-	if (!sc) {
-		ret_val = -ENOMEM;
-		goto out;
-	}
-
-	yaffs_trace(YAFFS_TRACE_OS,
-		"yaffs_readdir: starting at %d", (int)offset);
-
-	if (offset == 0) {
-		yaffs_trace(YAFFS_TRACE_OS,
-			"yaffs_readdir: entry . ino %d",
-			(int)inode->i_ino);
-		yaffs_gross_unlock(dev);
-		if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0) {
-			yaffs_gross_lock(dev);
-			goto out;
-		}
-		yaffs_gross_lock(dev);
-		offset++;
-		f->f_pos++;
-	}
-	if (offset == 1) {
-		yaffs_trace(YAFFS_TRACE_OS,
-			"yaffs_readdir: entry .. ino %d",
-			(int)f->f_dentry->d_parent->d_inode->i_ino);
-		yaffs_gross_unlock(dev);
-		if (filldir(dirent, "..", 2, offset,
-			    f->f_dentry->d_parent->d_inode->i_ino,
-			    DT_DIR) < 0) {
-			yaffs_gross_lock(dev);
-			goto out;
-		}
-		yaffs_gross_lock(dev);
-		offset++;
-		f->f_pos++;
-	}
-
-	curoffs = 1;
-
-	/* If the directory has changed since the open or last call to
-	   readdir, rewind to after the 2 canned entries. */
-	if (f->f_version != inode->i_version) {
-		offset = 2;
-		f->f_pos = offset;
-		f->f_version = inode->i_version;
-	}
-
-	while (sc->next_return) {
-		curoffs++;
-		l = sc->next_return;
-		if (curoffs >= offset) {
-			int this_inode = yaffs_get_obj_inode(l);
-			int this_type = yaffs_get_obj_type(l);
-
-			yaffs_get_obj_name(l, name, YAFFS_MAX_NAME_LENGTH + 1);
-			yaffs_trace(YAFFS_TRACE_OS,
-				"yaffs_readdir: %s inode %d",
-				name, yaffs_get_obj_inode(l));
-
-			yaffs_gross_unlock(dev);
-
-			if (filldir(dirent,
-				    name,
-				    strlen(name),
-				    offset, this_inode, this_type) < 0) {
-				yaffs_gross_lock(dev);
-				goto out;
-			}
-
-			yaffs_gross_lock(dev);
-
-			offset++;
-			f->f_pos++;
-		}
-		yaffs_search_advance(sc);
-	}
-
-out:
-	yaffs_search_end(sc);
-	yaffs_dev_to_lc(dev)->readdir_process = NULL;
-	yaffs_gross_unlock(dev);
-
-	return ret_val;
-}
-
-#endif
-
-static const struct file_operations yaffs_dir_operations = {
-	.read = generic_read_dir,
-#ifdef YAFFS_USE_DIR_ITERATE
-	.iterate = yaffs_iterate,
-#else
-	.readdir = yaffs_readdir,
-#endif
-	.fsync = yaffs_sync_object,
-	.llseek = generic_file_llseek,
-};
-
-static void yaffs_fill_inode_from_obj(struct inode *inode,
-				      struct yaffs_obj *obj)
-{
-	if (inode && obj) {
-
-		/* Check mode against the variant type and attempt to repair if broken. */
-		u32 mode = obj->yst_mode;
-		switch (obj->variant_type) {
-		case YAFFS_OBJECT_TYPE_FILE:
-			if (!S_ISREG(mode)) {
-				obj->yst_mode &= ~S_IFMT;
-				obj->yst_mode |= S_IFREG;
-			}
-
-			break;
-		case YAFFS_OBJECT_TYPE_SYMLINK:
-			if (!S_ISLNK(mode)) {
-				obj->yst_mode &= ~S_IFMT;
-				obj->yst_mode |= S_IFLNK;
-			}
-
-			break;
-		case YAFFS_OBJECT_TYPE_DIRECTORY:
-			if (!S_ISDIR(mode)) {
-				obj->yst_mode &= ~S_IFMT;
-				obj->yst_mode |= S_IFDIR;
-			}
-
-			break;
-		case YAFFS_OBJECT_TYPE_UNKNOWN:
-		case YAFFS_OBJECT_TYPE_HARDLINK:
-		case YAFFS_OBJECT_TYPE_SPECIAL:
-		default:
-			/* TODO? */
-			break;
-		}
-
-		inode->i_flags |= S_NOATIME;
-
-		inode->i_ino = obj->obj_id;
-		inode->i_mode = obj->yst_mode;
-		inode->i_uid = MAKE_uid(obj->yst_uid);
-		inode->i_gid = MAKE_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_get_obj_length(obj);
-		inode->i_blocks = (inode->i_size + 511) >> 9;
-
-		set_nlink(inode, yaffs_get_obj_link_count(obj));
-
-		yaffs_trace(YAFFS_TRACE_OS,
-			"yaffs_fill_inode mode %x uid %d gid %d size %lld count %d",
-			inode->i_mode, obj->yst_uid, obj->yst_gid,
-			inode->i_size, atomic_read(&inode->i_count));
-
-		switch (obj->yst_mode & S_IFMT) {
-		default:	/* fifo, device or socket */
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-			init_special_inode(inode, obj->yst_mode,
-					   old_decode_dev(obj->yst_rdev));
-#else
-			init_special_inode(inode, obj->yst_mode,
-					   (dev_t) (obj->yst_rdev));
-#endif
-			break;
-		case S_IFREG:	/* file */
-			inode->i_op = &yaffs_file_inode_operations;
-			inode->i_fop = &yaffs_file_operations;
-			inode->i_mapping->a_ops =
-			    &yaffs_file_address_operations;
-			break;
-		case S_IFDIR:	/* directory */
-			inode->i_op = &yaffs_dir_inode_operations;
-			inode->i_fop = &yaffs_dir_operations;
-			break;
-		case S_IFLNK:	/* symlink */
-			inode->i_op = &yaffs_symlink_inode_operations;
-			break;
-		}
-
-		yaffs_inode_to_obj_lv(inode) = obj;
-
-		obj->my_inode = inode;
-
-	} else {
-		yaffs_trace(YAFFS_TRACE_OS,
-			"yaffs_fill_inode invalid parameters");
-	}
-
-}
-
-
-
-/*
- * yaffs background thread functions .
- * yaffs_bg_thread_fn() the thread function
- * yaffs_bg_start() launches the background thread.
- * yaffs_bg_stop() cleans up the background thread.
- *
- * NB:
- * The thread should only run after the yaffs is initialised
- * The thread should be stopped before yaffs is unmounted.
- * The thread should not do any writing while the fs is in read only.
- */
-
-static unsigned yaffs_bg_gc_urgency(struct yaffs_dev *dev)
-{
-	unsigned erased_chunks =
-	    dev->n_erased_blocks * dev->param.chunks_per_block;
-	struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
-	unsigned scattered = 0;	/* Free chunks not in an erased block */
-
-	if (erased_chunks < dev->n_free_chunks)
-		scattered = (dev->n_free_chunks - erased_chunks);
-
-	if (!context->bg_running)
-		return 0;
-	else if (scattered < (dev->param.chunks_per_block * 2))
-		return 0;
-	else if (erased_chunks > dev->n_free_chunks / 2)
-		return 0;
-	else if (erased_chunks > dev->n_free_chunks / 4)
-		return 1;
-	else
-		return 2;
-}
-
-#ifdef YAFFS_COMPILE_BACKGROUND
-
-void yaffs_background_waker(unsigned long data)
-{
-	wake_up_process((struct task_struct *)data);
-}
-
-static int yaffs_bg_thread_fn(void *data)
-{
-	struct yaffs_dev *dev = (struct yaffs_dev *)data;
-	struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
-	unsigned long now = jiffies;
-	unsigned long next_dir_update = now;
-	unsigned long next_gc = now;
-	unsigned long expires;
-	unsigned int urgency;
-
-	int gc_result;
-	struct timer_list timer;
-
-	yaffs_trace(YAFFS_TRACE_BACKGROUND,
-		"yaffs_background starting for dev %p", (void *)dev);
-
-#ifdef YAFFS_COMPILE_FREEZER
-	set_freezable();
-#endif
-	while (context->bg_running) {
-		yaffs_trace(YAFFS_TRACE_BACKGROUND, "yaffs_background");
-
-		if (kthread_should_stop())
-			break;
-
-#ifdef YAFFS_COMPILE_FREEZER
-		if (try_to_freeze())
-			continue;
-#endif
-		yaffs_gross_lock(dev);
-
-		now = jiffies;
-
-		if (time_after(now, next_dir_update) && yaffs_bg_enable) {
-			yaffs_update_dirty_dirs(dev);
-			next_dir_update = now + HZ;
-		}
-
-		if (time_after(now, next_gc) && yaffs_bg_enable) {
-			if (!dev->is_checkpointed) {
-				urgency = yaffs_bg_gc_urgency(dev);
-				gc_result = yaffs_bg_gc(dev, urgency);
-				if (urgency > 1)
-					next_gc = now + HZ / 20 + 1;
-				else if (urgency > 0)
-					next_gc = now + HZ / 10 + 1;
-				else
-					next_gc = now + HZ * 2;
-			} else	{
-			        /*
-				 * gc not running so set to next_dir_update
-				 * to cut down on wake ups
-				 */
-				next_gc = next_dir_update;
-                        }
-		}
-		yaffs_gross_unlock(dev);
-#if 1
-		expires = next_dir_update;
-		if (time_before(next_gc, expires))
-			expires = next_gc;
-		if (time_before(expires, now))
-			expires = now + HZ;
-
-		Y_INIT_TIMER(&timer);
-		timer.expires = expires + 1;
-		timer.data = (unsigned long)current;
-		timer.function = yaffs_background_waker;
-
-		set_current_state(TASK_INTERRUPTIBLE);
-		add_timer(&timer);
-		schedule();
-		del_timer_sync(&timer);
-#else
-		msleep(10);
-#endif
-	}
-
-	return 0;
-}
-
-static int yaffs_bg_start(struct yaffs_dev *dev)
-{
-	int retval = 0;
-	struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
-
-	if (dev->read_only)
-		return -1;
-
-	context->bg_running = 1;
-
-	context->bg_thread = kthread_run(yaffs_bg_thread_fn,
-					 (void *)dev, "yaffs-bg-%d",
-					 context->mount_id);
-
-	if (IS_ERR(context->bg_thread)) {
-		retval = PTR_ERR(context->bg_thread);
-		context->bg_thread = NULL;
-		context->bg_running = 0;
-	}
-	return retval;
-}
-
-static void yaffs_bg_stop(struct yaffs_dev *dev)
-{
-	struct yaffs_linux_context *ctxt = yaffs_dev_to_lc(dev);
-
-	ctxt->bg_running = 0;
-
-	if (ctxt->bg_thread) {
-		kthread_stop(ctxt->bg_thread);
-		ctxt->bg_thread = NULL;
-	}
-}
-#else
-static int yaffs_bg_thread_fn(void *data)
-{
-	return 0;
-}
-
-static int yaffs_bg_start(struct yaffs_dev *dev)
-{
-	return 0;
-}
-
-static void yaffs_bg_stop(struct yaffs_dev *dev)
-{
-}
-#endif
-
-
-static void yaffs_flush_inodes(struct super_block *sb)
-{
-	struct inode *iptr;
-	struct yaffs_obj *obj;
-
-	list_for_each_entry(iptr, &sb->s_inodes, i_sb_list) {
-		obj = yaffs_inode_to_obj(iptr);
-		if (obj) {
-			yaffs_trace(YAFFS_TRACE_OS,
-				"flushing obj %d",
-				obj->obj_id);
-			yaffs_flush_file(obj, 1, 0, 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, 1);
-	if (do_checkpoint)
-		yaffs_checkpoint_save(dev);
-}
-
-static LIST_HEAD(yaffs_context_list);
-struct mutex yaffs_context_lock;
-
-static void yaffs_put_super(struct super_block *sb)
-{
-	struct yaffs_dev *dev = yaffs_super_to_dev(sb);
-	struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
-
-	yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_ALWAYS,
-			"yaffs_put_super");
-
-	yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
-		"Shutting down yaffs background thread");
-	yaffs_bg_stop(dev);
-	yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
-		"yaffs background thread shut down");
-
-	yaffs_gross_lock(dev);
-
-	yaffs_flush_super(sb, 1);
-
-	yaffs_deinitialise(dev);
-
-	yaffs_gross_unlock(dev);
-
-	mutex_lock(&yaffs_context_lock);
-	list_del_init(&(yaffs_dev_to_lc(dev)->context_list));
-	mutex_unlock(&yaffs_context_lock);
-
-	if (yaffs_dev_to_lc(dev)->spare_buffer) {
-		kfree(yaffs_dev_to_lc(dev)->spare_buffer);
-		yaffs_dev_to_lc(dev)->spare_buffer = NULL;
-	}
-
-	kfree(dev);
-
-	yaffs_put_mtd_device(mtd);
-
-	yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_ALWAYS,
-			"yaffs_put_super done");
-}
-
-
-static unsigned yaffs_gc_control_callback(struct yaffs_dev *dev)
-{
-	return yaffs_gc_control;
-}
-
-
-#ifdef YAFFS_COMPILE_EXPORTFS
-
-static struct inode *yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino,
-					  uint32_t generation)
-{
-	return Y_IGET(sb, ino);
-}
-
-static struct dentry *yaffs2_fh_to_dentry(struct super_block *sb,
-					  struct fid *fid, int fh_len,
-					  int fh_type)
-{
-	return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
-				    yaffs2_nfs_get_inode);
-}
-
-static struct dentry *yaffs2_fh_to_parent(struct super_block *sb,
-					  struct fid *fid, int fh_len,
-					  int fh_type)
-{
-	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
-				    yaffs2_nfs_get_inode);
-}
-
-struct dentry *yaffs2_get_parent(struct dentry *dentry)
-{
-
-	struct super_block *sb = dentry->d_inode->i_sb;
-	struct dentry *parent = ERR_PTR(-ENOENT);
-	struct inode *inode;
-	unsigned long parent_ino;
-	struct yaffs_obj *d_obj;
-	struct yaffs_obj *parent_obj;
-
-	d_obj = yaffs_inode_to_obj(dentry->d_inode);
-
-	if (d_obj) {
-		parent_obj = d_obj->parent;
-		if (parent_obj) {
-			parent_ino = yaffs_get_obj_inode(parent_obj);
-			inode = Y_IGET(sb, parent_ino);
-
-			if (IS_ERR(inode)) {
-				parent = ERR_CAST(inode);
-			} else {
-				parent = d_obtain_alias(inode);
-				if (!IS_ERR(parent)) {
-					parent = ERR_PTR(-ENOMEM);
-					iput(inode);
-				}
-			}
-		}
-	}
-
-	return parent;
-}
-
-/* Just declare a zero structure as a NULL value implies
- * using the default functions of exportfs.
- */
-
-static struct export_operations yaffs_export_ops = {
-	.fh_to_dentry = yaffs2_fh_to_dentry,
-	.fh_to_parent = yaffs2_fh_to_parent,
-	.get_parent = yaffs2_get_parent,
-};
-
-#endif
-
-static void yaffs_unstitch_obj(struct inode *inode, struct yaffs_obj *obj)
-{
-	/* Clear the association between the inode and
-	 * the struct yaffs_obj.
-	 */
-	obj->my_inode = NULL;
-	yaffs_inode_to_obj_lv(inode) = NULL;
-
-	/* If the object freeing was deferred, then the real
-	 * free happens now.
-	 * This should fix the inode inconsistency problem.
-	 */
-	yaffs_handle_defered_free(obj);
-}
-
-#ifdef YAFFS_HAS_EVICT_INODE
-/* yaffs_evict_inode combines into one operation what was previously done in
- * yaffs_clear_inode() and yaffs_delete_inode()
- *
- */
-static void yaffs_evict_inode(struct inode *inode)
-{
-	struct yaffs_obj *obj;
-	struct yaffs_dev *dev;
-	int deleteme = 0;
-
-	obj = yaffs_inode_to_obj(inode);
-
-	yaffs_trace(YAFFS_TRACE_OS,
-		"yaffs_evict_inode: ino %d, count %d %s",
-		(int)inode->i_ino, atomic_read(&inode->i_count),
-		obj ? "object exists" : "null object");
-
-	if (!inode->i_nlink && !is_bad_inode(inode))
-		deleteme = 1;
-	truncate_inode_pages(&inode->i_data, 0);
-	Y_CLEAR_INODE(inode);
-
-	if (deleteme && obj) {
-		dev = obj->my_dev;
-		yaffs_gross_lock(dev);
-		yaffs_del_obj(obj);
-		yaffs_gross_unlock(dev);
-	}
-	if (obj) {
-		dev = obj->my_dev;
-		yaffs_gross_lock(dev);
-		yaffs_unstitch_obj(inode, obj);
-		yaffs_gross_unlock(dev);
-	}
-}
-#else
-
-/* clear is called to tell the fs to release any per-inode data it holds.
- * The object might still exist on disk and is just being thrown out of the cache
- * or else the object has actually been deleted and we're being called via
- * the chain
- *   yaffs_delete_inode() -> clear_inode()->yaffs_clear_inode()
- */
-
-static void yaffs_clear_inode(struct inode *inode)
-{
-	struct yaffs_obj *obj;
-	struct yaffs_dev *dev;
-
-	obj = yaffs_inode_to_obj(inode);
-
-	yaffs_trace(YAFFS_TRACE_OS,
-		"yaffs_clear_inode: ino %d, count %d %s",
-		(int)inode->i_ino, atomic_read(&inode->i_count),
-		obj ? "object exists" : "null object");
-
-	if (obj) {
-		dev = obj->my_dev;
-		yaffs_gross_lock(dev);
-		yaffs_unstitch_obj(inode, obj);
-		yaffs_gross_unlock(dev);
-	}
-
-}
-
-/* delete is called when the link count is zero and the inode
- * is put (ie. nobody wants to know about it anymore, time to
- * delete the file).
- * NB Must call clear_inode()
- */
-static void yaffs_delete_inode(struct inode *inode)
-{
-	struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
-	struct yaffs_dev *dev;
-
-	yaffs_trace(YAFFS_TRACE_OS,
-		"yaffs_delete_inode: ino %d, count %d %s",
-		(int)inode->i_ino, atomic_read(&inode->i_count),
-		obj ? "object exists" : "null object");
-
-	if (obj) {
-		dev = obj->my_dev;
-		yaffs_gross_lock(dev);
-		yaffs_del_obj(obj);
-		yaffs_gross_unlock(dev);
-	}
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
-	truncate_inode_pages(&inode->i_data, 0);
-#endif
-	clear_inode(inode);
-}
-#endif
-
-
-
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
-{
-	struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
-	struct super_block *sb = dentry->d_sb;
-#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
-{
-	struct yaffs_dev *dev = yaffs_super_to_dev(sb);
-#else
-static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
-{
-	struct yaffs_dev *dev = yaffs_super_to_dev(sb);
-#endif
-
-	yaffs_trace(YAFFS_TRACE_OS, "yaffs_statfs");
-
-	yaffs_gross_lock(dev);
-
-	buf->f_type = YAFFS_MAGIC;
-	buf->f_bsize = sb->s_blocksize;
-	buf->f_namelen = 255;
-
-	if (dev->data_bytes_per_chunk & (dev->data_bytes_per_chunk - 1)) {
-		/* Do this if chunk size is not a power of 2 */
-
-		uint64_t bytes_in_dev;
-		uint64_t bytes_free;
-
-		bytes_in_dev =
-		    ((uint64_t)
-		     ((dev->param.end_block - dev->param.start_block +
-		       1))) * ((uint64_t) (dev->param.chunks_per_block *
-					   dev->data_bytes_per_chunk));
-
-		do_div(bytes_in_dev, sb->s_blocksize);	/* bytes_in_dev becomes the number of blocks */
-		buf->f_blocks = bytes_in_dev;
-
-		bytes_free = ((uint64_t) (yaffs_get_n_free_chunks(dev))) *
-		    ((uint64_t) (dev->data_bytes_per_chunk));
-
-		do_div(bytes_free, sb->s_blocksize);
-
-		buf->f_bfree = bytes_free;
-
-	} else if (sb->s_blocksize > dev->data_bytes_per_chunk) {
-
-		buf->f_blocks =
-		    (dev->param.end_block - dev->param.start_block + 1) *
-		    dev->param.chunks_per_block /
-		    (sb->s_blocksize / dev->data_bytes_per_chunk);
-		buf->f_bfree =
-		    yaffs_get_n_free_chunks(dev) /
-		    (sb->s_blocksize / dev->data_bytes_per_chunk);
-	} else {
-		buf->f_blocks =
-		    (dev->param.end_block - dev->param.start_block + 1) *
-		    dev->param.chunks_per_block *
-		    (dev->data_bytes_per_chunk / sb->s_blocksize);
-
-		buf->f_bfree =
-		    yaffs_get_n_free_chunks(dev) *
-		    (dev->data_bytes_per_chunk / sb->s_blocksize);
-	}
-
-	buf->f_files = 0;
-	buf->f_ffree = 0;
-	buf->f_bavail = buf->f_bfree;
-
-	yaffs_gross_unlock(dev);
-	return 0;
-}
-
-
-
-static int yaffs_do_sync_fs(struct super_block *sb, int request_checkpoint)
-{
-
-	struct yaffs_dev *dev = yaffs_super_to_dev(sb);
-	unsigned int oneshot_checkpoint = (yaffs_auto_checkpoint & 4);
-	unsigned gc_urgent = yaffs_bg_gc_urgency(dev);
-	int do_checkpoint;
-	int dirty = yaffs_check_super_dirty(dev);
-
-	yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
-		"yaffs_do_sync_fs: gc-urgency %d %s %s%s",
-		gc_urgent,
-		dirty ? "dirty" : "clean",
-		request_checkpoint ? "checkpoint requested" : "no checkpoint",
-		oneshot_checkpoint ? " one-shot" : "");
-
-	yaffs_gross_lock(dev);
-	do_checkpoint = ((request_checkpoint && !gc_urgent) ||
-			 oneshot_checkpoint) && !dev->is_checkpointed;
-
-	if (dirty || do_checkpoint) {
-		yaffs_flush_super(sb, !dev->is_checkpointed && do_checkpoint);
-		yaffs_clear_super_dirty(dev);
-		if (oneshot_checkpoint)
-			yaffs_auto_checkpoint &= ~4;
-	}
-	yaffs_gross_unlock(dev);
-
-	return 0;
-}
-
-
-#ifdef YAFFS_HAS_WRITE_SUPER
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-static void yaffs_write_super(struct super_block *sb)
-#else
-static int yaffs_write_super(struct super_block *sb)
-#endif
-{
-	unsigned request_checkpoint = (yaffs_auto_checkpoint >= 2);
-
-	yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
-		"yaffs_write_super %s",
-		request_checkpoint ? " checkpt" : "");
-
-	yaffs_do_sync_fs(sb, request_checkpoint);
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18))
-	return 0;
-#endif
-}
-#endif
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-static int yaffs_sync_fs(struct super_block *sb, int wait)
-#else
-static int yaffs_sync_fs(struct super_block *sb)
-#endif
-{
-	unsigned request_checkpoint = (yaffs_auto_checkpoint >= 1);
-
-	yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
-		"yaffs_sync_fs%s", request_checkpoint ? " checkpt" : "");
-
-	yaffs_do_sync_fs(sb, request_checkpoint);
-
-	return 0;
-}
-
-/* the function only is used to change dev->read_only when this file system
- * is remounted.
- */
-static int yaffs_remount_fs(struct super_block *sb, int *flags, char *data)
-{
-	int read_only = 0;
-	struct mtd_info *mtd;
-	struct yaffs_dev *dev = 0;
-
-	/* 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 1;
-	}
-
-	/* Check it's NAND */
-	if (mtd->type != MTD_NANDFLASH && mtd->type != MTD_MLCNANDFLASH) {
-		yaffs_trace(YAFFS_TRACE_ALWAYS,
-			"MTD device is not NAND it's type %d",
-			mtd->type);
-		return 1;
-	}
-
-	read_only = ((*flags & MS_RDONLY) != 0);
-	if (!read_only && !(mtd->flags & MTD_WRITEABLE)) {
-		read_only = 1;
-		printk(KERN_INFO
-			"yaffs: mtd is read only, setting superblock read only");
-		*flags |= MS_RDONLY;
-	}
-
-	dev = sb->s_fs_info;
-	dev->read_only = read_only;
-
-	return 0;
-}
-
-static const struct super_operations yaffs_super_ops = {
-	.statfs = yaffs_statfs,
-
-#ifndef YAFFS_USE_OWN_IGET
-	.read_inode = yaffs_read_inode,
-#endif
-#ifdef YAFFS_HAS_PUT_INODE
-	.put_inode = yaffs_put_inode,
-#endif
-	.put_super = yaffs_put_super,
-#ifdef YAFFS_HAS_EVICT_INODE
-	.evict_inode = yaffs_evict_inode,
-#else
-	.delete_inode = yaffs_delete_inode,
-	.clear_inode = yaffs_clear_inode,
-#endif
-	.sync_fs = yaffs_sync_fs,
-#ifdef YAFFS_HAS_WRITE_SUPER
-	.write_super = yaffs_write_super,
-#endif
-	.remount_fs = yaffs_remount_fs,
-};
-
-struct yaffs_options {
-	int inband_tags;
-	int skip_checkpoint_read;
-	int skip_checkpoint_write;
-	int no_cache;
-	int tags_ecc_on;
-	int tags_ecc_overridden;
-	int lazy_loading_enabled;
-	int lazy_loading_overridden;
-	int empty_lost_and_found;
-	int empty_lost_and_found_overridden;
-	int disable_summary;
-};
-
-#define MAX_OPT_LEN 30
-static int yaffs_parse_options(struct yaffs_options *options,
-			       const char *options_str)
-{
-	char cur_opt[MAX_OPT_LEN + 1];
-	int p;
-	int error = 0;
-
-	/* Parse through the options which is a comma seperated list */
-
-	while (options_str && *options_str && !error) {
-		memset(cur_opt, 0, MAX_OPT_LEN + 1);
-		p = 0;
-
-		while (*options_str == ',')
-			options_str++;
-
-		while (*options_str && *options_str != ',') {
-			if (p < MAX_OPT_LEN) {
-				cur_opt[p] = *options_str;
-				p++;
-			}
-			options_str++;
-		}
-
-		if (!strcmp(cur_opt, "inband-tags")) {
-			options->inband_tags = 1;
-		} else if (!strcmp(cur_opt, "tags-ecc-off")) {
-			options->tags_ecc_on = 0;
-			options->tags_ecc_overridden = 1;
-		} else if (!strcmp(cur_opt, "tags-ecc-on")) {
-			options->tags_ecc_on = 1;
-			options->tags_ecc_overridden = 1;
-		} else if (!strcmp(cur_opt, "lazy-loading-off")) {
-			options->lazy_loading_enabled = 0;
-			options->lazy_loading_overridden = 1;
-		} else if (!strcmp(cur_opt, "lazy-loading-on")) {
-			options->lazy_loading_enabled = 1;
-			options->lazy_loading_overridden = 1;
-		} else if (!strcmp(cur_opt, "disable-summary")) {
-			options->disable_summary = 1;
-		} else if (!strcmp(cur_opt, "empty-lost-and-found-off")) {
-			options->empty_lost_and_found = 0;
-			options->empty_lost_and_found_overridden = 1;
-		} else if (!strcmp(cur_opt, "empty-lost-and-found-on")) {
-			options->empty_lost_and_found = 1;
-			options->empty_lost_and_found_overridden = 1;
-		} else if (!strcmp(cur_opt, "no-cache")) {
-			options->no_cache = 1;
-		} else if (!strcmp(cur_opt, "no-checkpoint-read")) {
-			options->skip_checkpoint_read = 1;
-		} else if (!strcmp(cur_opt, "no-checkpoint-write")) {
-			options->skip_checkpoint_write = 1;
-		} else if (!strcmp(cur_opt, "no-checkpoint")) {
-			options->skip_checkpoint_read = 1;
-			options->skip_checkpoint_write = 1;
-		} else {
-			printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",
-			       cur_opt);
-			error = 1;
-		}
-	}
-
-	return error;
-}
-
-
-static struct dentry *yaffs_make_root(struct inode *inode)
-{
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0))
-	struct dentry *root = d_alloc_root(inode);
-
-	if (!root)
-		iput(inode);
-
-        return root;
-#else
-        return d_make_root(inode);
-#endif
-}
-
-
-
-
-static struct super_block *yaffs_internal_read_super(int yaffs_version,
-						     struct super_block *sb,
-						     void *data, int silent)
-{
-	int n_blocks;
-	struct inode *inode = NULL;
-	struct dentry *root;
-	struct yaffs_dev *dev = 0;
-	char devname_buf[BDEVNAME_SIZE + 1];
-	struct mtd_info *mtd;
-	int err;
-	char *data_str = (char *)data;
-	struct yaffs_linux_context *context = NULL;
-	struct yaffs_param *param;
-
-	int read_only = 0;
-	int inband_tags = 0;
-
-	struct yaffs_options options;
-
-	unsigned mount_id;
-	int found;
-	struct yaffs_linux_context *context_iterator;
-	struct list_head *l;
-
-	if (!sb) {
-		printk(KERN_INFO "yaffs: sb is NULL\n");
-		return NULL;
-        }
-
-	sb->s_magic = YAFFS_MAGIC;
-	sb->s_op = &yaffs_super_ops;
-	sb->s_flags |= MS_NOATIME;
-
-	read_only = ((sb->s_flags & MS_RDONLY) != 0);
-
-#ifdef YAFFS_COMPILE_EXPORTFS
-	sb->s_export_op = &yaffs_export_ops;
-#endif
-
-	if (!sb->s_dev)
-		printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
-	else if (!yaffs_devname(sb, devname_buf))
-		printk(KERN_INFO "yaffs: devname is NULL\n");
-	else
-		printk(KERN_INFO "yaffs: dev is %d name is \"%s\" %s\n",
-		       sb->s_dev,
-		       yaffs_devname(sb, devname_buf), read_only ? "ro" : "rw");
-
-	if (!data_str)
-		data_str = "";
-
-	printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str);
-
-	memset(&options, 0, sizeof(options));
-
-	if (yaffs_parse_options(&options, data_str)) {
-		/* Option parsing failed */
-		return NULL;
-	}
-
-	sb->s_blocksize = PAGE_CACHE_SIZE;
-	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
-
-	yaffs_trace(YAFFS_TRACE_OS,
-		"yaffs_read_super: Using yaffs%d", yaffs_version);
-	yaffs_trace(YAFFS_TRACE_OS,
-		"yaffs_read_super: block size %d", (int)(sb->s_blocksize));
-
-	yaffs_trace(YAFFS_TRACE_ALWAYS,
-		"yaffs: Attempting MTD mount of %u.%u,\"%s\"",
-		MAJOR(sb->s_dev), MINOR(sb->s_dev),
-		yaffs_devname(sb, devname_buf));
-
-	/* Get the device */
-	mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
-	if (IS_ERR(mtd)) {
-		yaffs_trace(YAFFS_TRACE_ALWAYS,
-			"yaffs: MTD device %u either not valid or unavailable",
-			MINOR(sb->s_dev));
-		return NULL;
-	}
-
-	if (yaffs_auto_select && yaffs_version == 1 && WRITE_SIZE(mtd) >= 2048) {
-		yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs2");
-		yaffs_version = 2;
-	}
-
-	/* Added NCB 26/5/2006 for completeness */
-	if (yaffs_version == 2 && !options.inband_tags
-	    && WRITE_SIZE(mtd) == 512) {
-		yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs1");
-		yaffs_version = 1;
-	}
-
-	if (mtd->oobavail < sizeof(struct yaffs_packed_tags2) ||
-	    options.inband_tags)
-		inband_tags = 1;
-
-	if(yaffs_verify_mtd(mtd, yaffs_version, inband_tags) < 0)
-		return NULL;
-
-	/* OK, so if we got here, we have an MTD that's NAND and looks
-	 * like it has the right capabilities
-	 * Set the struct yaffs_dev up for mtd
-	 */
-
-	if (!read_only && !(mtd->flags & MTD_WRITEABLE)) {
-		read_only = 1;
-		printk(KERN_INFO
-		       "yaffs: mtd is read only, setting superblock read only\n"
-		);
-		sb->s_flags |= MS_RDONLY;
-	}
-
-	dev = kmalloc(sizeof(struct yaffs_dev), GFP_KERNEL);
-	context = kmalloc(sizeof(struct yaffs_linux_context), GFP_KERNEL);
-
-	if (!dev || !context) {
-		kfree(dev);
-		kfree(context);
-		dev = NULL;
-		context = NULL;
-
-		/* Deep shit could not allocate device structure */
-		yaffs_trace(YAFFS_TRACE_ALWAYS,
-			"yaffs_read_super: Failed trying to allocate struct yaffs_dev."
-		);
-		return NULL;
-	}
-	memset(dev, 0, sizeof(struct yaffs_dev));
-	param = &(dev->param);
-
-	memset(context, 0, sizeof(struct yaffs_linux_context));
-	dev->os_context = context;
-	INIT_LIST_HEAD(&(context->context_list));
-	context->dev = dev;
-	context->super = sb;
-
-	dev->read_only = read_only;
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-	sb->s_fs_info = dev;
-#else
-	sb->u.generic_sbp = dev;
-#endif
-
-
-	dev->driver_context = mtd;
-	param->name = mtd->name;
-
-	/* Set up the memory size parameters.... */
-
-
-	param->n_reserved_blocks = 5;
-	param->n_caches = (options.no_cache) ? 0 : 10;
-	param->inband_tags = inband_tags;
-
-	param->enable_xattr = 1;
-	if (options.lazy_loading_overridden)
-		param->disable_lazy_load = !options.lazy_loading_enabled;
-
-	param->defered_dir_update = 1;
-
-	if (options.tags_ecc_overridden)
-		param->no_tags_ecc = !options.tags_ecc_on;
-
-	param->empty_lost_n_found = 1;
-	param->refresh_period = 500;
-	param->disable_summary = options.disable_summary;
-
-
-#ifdef CONFIG_YAFFS_DISABLE_BAD_BLOCK_MARKING
-	param->disable_bad_block_marking  = 1;
-#endif
-	if (options.empty_lost_and_found_overridden)
-		param->empty_lost_n_found = options.empty_lost_and_found;
-
-	/* ... and the functions. */
-	if (yaffs_version == 2) {
-		param->is_yaffs2 = 1;
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-		param->total_bytes_per_chunk = mtd->writesize;
-		param->chunks_per_block = mtd->erasesize / mtd->writesize;
-#else
-		param->total_bytes_per_chunk = mtd->oobblock;
-		param->chunks_per_block = mtd->erasesize / mtd->oobblock;
-#endif
-		n_blocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
-
-		param->start_block = 0;
-		param->end_block = n_blocks - 1;
-	} else {
-		param->is_yaffs2 = 0;
-		n_blocks = YCALCBLOCKS(mtd->size,
-			     YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
-
-		param->chunks_per_block = YAFFS_CHUNKS_PER_BLOCK;
-		param->total_bytes_per_chunk = YAFFS_BYTES_PER_CHUNK;
-	}
-
-	param->start_block = 0;
-	param->end_block = n_blocks - 1;
-
-	yaffs_mtd_drv_install(dev);
-
-	param->sb_dirty_fn = yaffs_set_super_dirty;
-	param->gc_control_fn = yaffs_gc_control_callback;
-
-	yaffs_dev_to_lc(dev)->super = sb;
-
-	param->use_nand_ecc = 1;
-
-	param->skip_checkpt_rd = options.skip_checkpoint_read;
-	param->skip_checkpt_wr = options.skip_checkpoint_write;
-
-	mutex_lock(&yaffs_context_lock);
-	/* Get a mount id */
-	found = 0;
-	for (mount_id = 0; !found; mount_id++) {
-		found = 1;
-		list_for_each(l, &yaffs_context_list) {
-			context_iterator =
-			    list_entry(l, struct yaffs_linux_context,
-				       context_list);
-			if (context_iterator->mount_id == mount_id)
-				found = 0;
-		}
-	}
-	context->mount_id = mount_id;
-
-	list_add_tail(&(yaffs_dev_to_lc(dev)->context_list),
-		      &yaffs_context_list);
-	mutex_unlock(&yaffs_context_lock);
-
-	/* Directory search handling... */
-	INIT_LIST_HEAD(&(yaffs_dev_to_lc(dev)->search_contexts));
-	param->remove_obj_fn = yaffs_remove_obj_callback;
-
-	mutex_init(&(yaffs_dev_to_lc(dev)->gross_lock));
-
-	yaffs_gross_lock(dev);
-
-	err = yaffs_guts_initialise(dev);
-
-	yaffs_trace(YAFFS_TRACE_OS,
-		"yaffs_read_super: guts initialised %s",
-		(err == YAFFS_OK) ? "OK" : "FAILED");
-
-	if (err == YAFFS_OK)
-		yaffs_bg_start(dev);
-
-	if (!context->bg_thread)
-		param->defered_dir_update = 0;
-
-	sb->s_maxbytes = yaffs_max_file_size(dev);
-
-	/* Release lock before yaffs_get_inode() */
-	yaffs_gross_unlock(dev);
-
-	/* Create root inode */
-	if (err == YAFFS_OK)
-		inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0, yaffs_root(dev));
-
-	if (!inode)
-		return NULL;
-
-	inode->i_op = &yaffs_dir_inode_operations;
-	inode->i_fop = &yaffs_dir_operations;
-
-	yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: got root inode");
-
-	root = yaffs_make_root(inode);
-
-	if (!root)
-		return NULL;
-
-	sb->s_root = root;
-	if(!dev->is_checkpointed)
-		yaffs_set_super_dirty(dev);
-
-	yaffs_trace(YAFFS_TRACE_ALWAYS,
-		"yaffs_read_super: is_checkpointed %d",
-		dev->is_checkpointed);
-
-	yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: done");
-	return sb;
-}
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
-					 int silent)
-{
-	return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
-}
-
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
-static struct dentry *yaffs_mount(struct file_system_type *fs_type, int flags,
-        const char *dev_name, void *data)
-{
-    return mount_bdev(fs_type, flags, dev_name, data, yaffs_internal_read_super_mtd);
-}
-#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-static int yaffs_read_super(struct file_system_type *fs,
-			    int flags, const char *dev_name,
-			    void *data, struct vfsmount *mnt)
-{
-
-	return get_sb_bdev(fs, flags, dev_name, data,
-			   yaffs_internal_read_super_mtd, mnt);
-}
-#else
-static struct super_block *yaffs_read_super(struct file_system_type *fs,
-					    int flags, const char *dev_name,
-					    void *data)
-{
-
-	return get_sb_bdev(fs, flags, dev_name, data,
-			   yaffs_internal_read_super_mtd);
-}
-#endif
-
-static struct file_system_type yaffs_fs_type = {
-	.owner = THIS_MODULE,
-	.name = "yaffs",
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
-        .mount = yaffs_mount,
-#else
-        .get_sb = yaffs_read_super,
-#endif
-     	.kill_sb = kill_block_super,
-	.fs_flags = FS_REQUIRES_DEV,
-};
-#else
-static struct super_block *yaffs_read_super(struct super_block *sb, void *data,
-					    int silent)
-{
-	return yaffs_internal_read_super(1, sb, data, silent);
-}
-
-static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super,
-		      FS_REQUIRES_DEV);
-#endif
-
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
-					  int silent)
-{
-	return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
-}
-
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
-static struct dentry *yaffs2_mount(struct file_system_type *fs_type, int flags,
-        const char *dev_name, void *data)
-{
-        return mount_bdev(fs_type, flags, dev_name, data, yaffs2_internal_read_super_mtd);
-}
-#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-static int yaffs2_read_super(struct file_system_type *fs,
-			     int flags, const char *dev_name, void *data,
-			     struct vfsmount *mnt)
-{
-	return get_sb_bdev(fs, flags, dev_name, data,
-			   yaffs2_internal_read_super_mtd, mnt);
-}
-#else
-static struct super_block *yaffs2_read_super(struct file_system_type *fs,
-					     int flags, const char *dev_name,
-					     void *data)
-{
-
-	return get_sb_bdev(fs, flags, dev_name, data,
-			   yaffs2_internal_read_super_mtd);
-}
-#endif
-
-static struct file_system_type yaffs2_fs_type = {
-	.owner = THIS_MODULE,
-	.name = "yaffs2",
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
-        .mount = yaffs2_mount,
-#else
-        .get_sb = yaffs2_read_super,
-#endif
-     	.kill_sb = kill_block_super,
-	.fs_flags = FS_REQUIRES_DEV,
-};
-#else
-static struct super_block *yaffs2_read_super(struct super_block *sb,
-					     void *data, int silent)
-{
-	return yaffs_internal_read_super(2, sb, data, silent);
-}
-
-static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
-		      FS_REQUIRES_DEV);
-#endif
-
-
-static struct proc_dir_entry *my_proc_entry;
-
-static char *yaffs_dump_dev_part0(char *buf, struct yaffs_dev *dev)
-{
-	struct yaffs_param *param = &dev->param;
-	int bs[10];
-
-	yaffs_count_blocks_by_state(dev,bs);
-
-	buf += sprintf(buf, "start_block.......... %d\n", param->start_block);
-	buf += sprintf(buf, "end_block............ %d\n", param->end_block);
-	buf += sprintf(buf, "total_bytes_per_chunk %d\n",
-				param->total_bytes_per_chunk);
-	buf += sprintf(buf, "use_nand_ecc......... %d\n", param->use_nand_ecc);
-	buf += sprintf(buf, "no_tags_ecc.......... %d\n", param->no_tags_ecc);
-	buf += sprintf(buf, "is_yaffs2............ %d\n", param->is_yaffs2);
-	buf += sprintf(buf, "inband_tags.......... %d\n", param->inband_tags);
-	buf += sprintf(buf, "empty_lost_n_found... %d\n",
-				param->empty_lost_n_found);
-	buf += sprintf(buf, "disable_lazy_load.... %d\n",
-				param->disable_lazy_load);
-	buf += sprintf(buf, "disable_bad_block_mrk %d\n",
-				param->disable_bad_block_marking);
-	buf += sprintf(buf, "refresh_period....... %d\n",
-				param->refresh_period);
-	buf += sprintf(buf, "n_caches............. %d\n", param->n_caches);
-	buf += sprintf(buf, "n_reserved_blocks.... %d\n",
-				param->n_reserved_blocks);
-	buf += sprintf(buf, "always_check_erased.. %d\n",
-				param->always_check_erased);
-	buf += sprintf(buf, "\n");
-	buf += sprintf(buf, "block count by state\n");
-	buf += sprintf(buf, "0:%d 1:%d 2:%d 3:%d 4:%d\n",
-				bs[0], bs[1], bs[2], bs[3], bs[4]);
-	buf += sprintf(buf, "5:%d 6:%d 7:%d 8:%d 9:%d\n",
-				bs[5], bs[6], bs[7], bs[8], bs[9]);
-
-	return buf;
-}
-
-static char *yaffs_dump_dev_part1(char *buf, struct yaffs_dev *dev)
-{
-	buf += sprintf(buf, "max file size....... %lld\n",
-				(long long) yaffs_max_file_size(dev));
-	buf += sprintf(buf, "data_bytes_per_chunk. %d\n",
-				dev->data_bytes_per_chunk);
-	buf += sprintf(buf, "chunk_grp_bits....... %d\n", dev->chunk_grp_bits);
-	buf += sprintf(buf, "chunk_grp_size....... %d\n", dev->chunk_grp_size);
-	buf += sprintf(buf, "n_erased_blocks...... %d\n", dev->n_erased_blocks);
-	buf += sprintf(buf, "blocks_in_checkpt.... %d\n",
-				dev->blocks_in_checkpt);
-	buf += sprintf(buf, "\n");
-	buf += sprintf(buf, "n_tnodes............. %d\n", dev->n_tnodes);
-	buf += sprintf(buf, "n_obj................ %d\n", dev->n_obj);
-	buf += sprintf(buf, "n_free_chunks........ %d\n", dev->n_free_chunks);
-	buf += sprintf(buf, "\n");
-	buf += sprintf(buf, "n_page_writes........ %u\n", dev->n_page_writes);
-	buf += sprintf(buf, "n_page_reads......... %u\n", dev->n_page_reads);
-	buf += sprintf(buf, "n_erasures........... %u\n", dev->n_erasures);
-	buf += sprintf(buf, "n_gc_copies.......... %u\n", dev->n_gc_copies);
-	buf += sprintf(buf, "all_gcs.............. %u\n", dev->all_gcs);
-	buf += sprintf(buf, "passive_gc_count..... %u\n",
-				dev->passive_gc_count);
-	buf += sprintf(buf, "oldest_dirty_gc_count %u\n",
-				dev->oldest_dirty_gc_count);
-	buf += sprintf(buf, "n_gc_blocks.......... %u\n", dev->n_gc_blocks);
-	buf += sprintf(buf, "bg_gcs............... %u\n", dev->bg_gcs);
-	buf += sprintf(buf, "n_retried_writes..... %u\n",
-				dev->n_retried_writes);
-	buf += sprintf(buf, "n_retired_blocks..... %u\n",
-				dev->n_retired_blocks);
-	buf += sprintf(buf, "n_ecc_fixed.......... %u\n", dev->n_ecc_fixed);
-	buf += sprintf(buf, "n_ecc_unfixed........ %u\n", dev->n_ecc_unfixed);
-	buf += sprintf(buf, "n_tags_ecc_fixed..... %u\n",
-				dev->n_tags_ecc_fixed);
-	buf += sprintf(buf, "n_tags_ecc_unfixed... %u\n",
-				dev->n_tags_ecc_unfixed);
-	buf += sprintf(buf, "cache_hits........... %u\n", dev->cache_hits);
-	buf += sprintf(buf, "n_deleted_files...... %u\n", dev->n_deleted_files);
-	buf += sprintf(buf, "n_unlinked_files..... %u\n",
-				dev->n_unlinked_files);
-	buf += sprintf(buf, "refresh_count........ %u\n", dev->refresh_count);
-	buf += sprintf(buf, "n_bg_deletions....... %u\n", dev->n_bg_deletions);
-	buf += sprintf(buf, "tags_used............ %u\n", dev->tags_used);
-	buf += sprintf(buf, "summary_used......... %u\n", dev->summary_used);
-
-	return buf;
-}
-
-static int yaffs_proc_read(char *page,
-			   char **start,
-			   off_t offset, int count, int *eof, void *data)
-{
-	struct list_head *item;
-	char *buf = page;
-	int step = offset;
-	int n = 0;
-
-	/* Get proc_file_read() to step 'offset' by one on each sucessive call.
-	 * We use 'offset' (*ppos) to indicate where we are in dev_list.
-	 * This also assumes the user has posted a read buffer large
-	 * enough to hold the complete output; but that's life in /proc.
-	 */
-
-	*(int *)start = 1;
-
-	/* Print header first */
-	if (step == 0)
-		buf +=
-		    sprintf(buf,
-			    "Multi-version YAFFS."
-			    "\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)
-{
-	unsigned rg = 0, mask_bitfield;
-	char *end;
-	char *mask_name;
-	const char *x;
-	char substring[MAX_MASK_NAME_LENGTH + 1];
-	int i;
-	int done = 0;
-	int add, len = 0;
-	int pos = 0;
-
-	rg = yaffs_trace_mask;
-
-	while (!done && (pos < count)) {
-		done = 1;
-		while ((pos < count) && isspace(buf[pos]))
-			pos++;
-
-		switch (buf[pos]) {
-		case '+':
-		case '-':
-		case '=':
-			add = buf[pos];
-			pos++;
-			break;
-
-		default:
-			add = ' ';
-			break;
-		}
-		mask_name = NULL;
-
-		mask_bitfield = simple_strtoul(buf + pos, &end, 0);
-
-		if (end > buf + pos) {
-			mask_name = "numeral";
-			len = end - (buf + pos);
-			pos += len;
-			done = 0;
-		} else {
-			for (x = buf + pos, i = 0;
-			     (*x == '_' || (*x >= 'a' && *x <= 'z')) &&
-			     i < MAX_MASK_NAME_LENGTH; x++, i++, pos++)
-				substring[i] = *x;
-			substring[i] = '\0';
-
-			for (i = 0; mask_flags[i].mask_name != NULL; i++) {
-				if (strcmp(substring, mask_flags[i].mask_name)
-				    == 0) {
-					mask_name = mask_flags[i].mask_name;
-					mask_bitfield =
-					    mask_flags[i].mask_bitfield;
-					done = 0;
-					break;
-				}
-			}
-		}
-
-		if (mask_name != NULL) {
-			done = 0;
-			switch (add) {
-			case '-':
-				rg &= ~mask_bitfield;
-				break;
-			case '+':
-				rg |= mask_bitfield;
-				break;
-			case '=':
-				rg = mask_bitfield;
-				break;
-			default:
-				rg |= mask_bitfield;
-				break;
-			}
-		}
-	}
-
-	yaffs_trace_mask = rg | YAFFS_TRACE_ALWAYS;
-
-	printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_trace_mask);
-
-	if (rg & YAFFS_TRACE_ALWAYS) {
-		for (i = 0; mask_flags[i].mask_name != NULL; i++) {
-			char flag;
-			flag = ((rg & mask_flags[i].mask_bitfield) ==
-				mask_flags[i].mask_bitfield) ? '+' : '-';
-			printk(KERN_DEBUG "%c%s\n", flag,
-			       mask_flags[i].mask_name);
-		}
-	}
-
-	return count;
-}
-
-/* Debug strings are of the form:
- * .bnnn         print info on block n
- * .cobjn,chunkn print nand chunk id for objn:chunkn
- */
-
-static int yaffs_proc_debug_write(struct file *file, const char *buf,
-					  unsigned long count)
-{
-
-	char str[100];
-	char *p0;
-	char *p1;
-	long p1_val;
-	long p0_val;
-	char cmd;
-	struct list_head *item;
-
-	memset(str, 0, sizeof(str));
-	memcpy(str, buf, min((size_t)count, sizeof(str) -1));
-
-	cmd = str[1];
-
-	p0 = str + 2;
-
-	p1 = p0;
-
-	while (*p1 && *p1 != ',') {
-		p1++;
-	}
-	*p1 = '\0';
-	p1++;
-
-	p0_val = simple_strtol(p0, NULL, 0);
-	p1_val = simple_strtol(p1, NULL, 0);
-
-
-	mutex_lock(&yaffs_context_lock);
-
-	/* Locate and print the Nth entry.  Order N-squared but N is small. */
-	list_for_each(item, &yaffs_context_list) {
-		struct yaffs_linux_context *dc =
-		    list_entry(item, struct yaffs_linux_context,
-			       context_list);
-		struct yaffs_dev *dev = dc->dev;
-
-		if (cmd == 'b') {
-			struct yaffs_block_info *bi;
-
-			bi = yaffs_get_block_info(dev,p0_val);
-
-			if(bi) {
-				printk("Block %d: state %d, retire %d, use %d, seq %d\n",
-					(int)p0_val, bi->block_state,
-					bi->needs_retiring, bi->pages_in_use,
-					bi->seq_number);
-			}
-		} else if (cmd == 'c') {
-			struct yaffs_obj *obj;
-			int nand_chunk;
-
-			obj = yaffs_find_by_number(dev, p0_val);
-			if (!obj)
-				printk("No obj %d\n", (int)p0_val);
-			else {
-				if(p1_val == 0)
-					nand_chunk = obj->hdr_chunk;
-				else
-					nand_chunk =
-						yaffs_find_chunk_in_file(obj,
-							p1_val, NULL);
-				printk("Nand chunk for %d:%d is %d\n",
-					(int)p0_val, (int)p1_val, nand_chunk);
-			}
-		}
-	}
-
-	mutex_unlock(&yaffs_context_lock);
-
-	return count;
-}
-
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 14, 0))
-static int yaffs_proc_write(struct file *file, const char *buf,
-			    unsigned long count, void *ppos)
-#else
-static ssize_t yaffs_proc_write(struct file *file, const char __user *buf,
-			    size_t count, loff_t *ppos)
-#endif
-{
-	if (buf[0] == '.')
-		return yaffs_proc_debug_write(file, buf, count);
-	return yaffs_proc_write_trace_options(file, buf, count);
-}
-
-/* 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}
-};
-
-
-#ifdef YAFFS_NEW_PROCFS
-static int yaffs_proc_show(struct seq_file *m, void *v)
-{
-	/* FIXME: Unify in a better way? */
-	char buffer[512];
-	char *start;
-	int len;
-
-	len = yaffs_proc_read(buffer, &start, 0, sizeof(buffer), NULL, NULL);
-	seq_puts(m, buffer);
-	return 0;
-}
-
-static int yaffs_proc_open(struct inode *inode, struct file *file)
-{
-	return single_open(file, yaffs_proc_show, NULL);
-}
-
-static struct file_operations procfs_ops = {
-	.owner = THIS_MODULE,
-	.open  = yaffs_proc_open,
-	.read  = seq_read,
-	.write = yaffs_proc_write,
-};
-
-static int yaffs_procfs_init(void)
-{
-	/* Install the proc_fs entries */
-	my_proc_entry = proc_create("yaffs",
-				    S_IRUGO | S_IFREG,
-				    YPROC_ROOT,
-				    &procfs_ops);
-
-	if (my_proc_entry) {
-		return 0;
-	} else {
-		return -ENOMEM;
-	}
-}
-
-#else
-
-
-static int yaffs_procfs_init(void)
-{
-	/* 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;
-		return 0;
-	} else {
-		return -ENOMEM;
-	}
-}
-
-#endif
-
-
-static int __init init_yaffs_fs(void)
-{
-	int error = 0;
-	struct file_system_to_install *fsinst;
-
-	yaffs_trace(YAFFS_TRACE_ALWAYS,
-		"yaffs Installing.");
-
-	mutex_init(&yaffs_context_lock);
-
-	error = yaffs_procfs_init();
-	if (error)
-		return error;
-
-	/* 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 removing.");
-
-	remove_proc_entry("yaffs", 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., 2002-2011");
-MODULE_LICENSE("GPL");

target/linux/generic/files/fs/yaffs2/yaffs_yaffs1.c

@@ -1,422 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include "yaffs_yaffs1.h"
-#include "yportenv.h"
-#include "yaffs_trace.h"
-#include "yaffs_bitmap.h"
-#include "yaffs_getblockinfo.h"
-#include "yaffs_nand.h"
-#include "yaffs_attribs.h"
-
-int yaffs1_scan(struct yaffs_dev *dev)
-{
-	struct yaffs_ext_tags tags;
-	int blk;
-	int result;
-	int chunk;
-	int c;
-	int deleted;
-	enum yaffs_block_state state;
-	LIST_HEAD(hard_list);
-	struct yaffs_block_info *bi;
-	u32 seq_number;
-	struct yaffs_obj_hdr *oh;
-	struct yaffs_obj *in;
-	struct yaffs_obj *parent;
-	int alloc_failed = 0;
-	struct yaffs_shadow_fixer *shadow_fixers = NULL;
-	u8 *chunk_data;
-
-	yaffs_trace(YAFFS_TRACE_SCAN,
-		"yaffs1_scan starts  intstartblk %d intendblk %d...",
-		dev->internal_start_block, dev->internal_end_block);
-
-	chunk_data = yaffs_get_temp_buffer(dev);
-
-	dev->seq_number = YAFFS_LOWEST_SEQUENCE_NUMBER;
-
-	/* Scan all the blocks to determine their state */
-	bi = dev->block_info;
-	for (blk = dev->internal_start_block; blk <= dev->internal_end_block;
-	     blk++) {
-		yaffs_clear_chunk_bits(dev, blk);
-		bi->pages_in_use = 0;
-		bi->soft_del_pages = 0;
-
-		yaffs_query_init_block_state(dev, blk, &state, &seq_number);
-
-		bi->block_state = state;
-		bi->seq_number = seq_number;
-
-		if (bi->seq_number == YAFFS_SEQUENCE_BAD_BLOCK)
-			bi->block_state = state = YAFFS_BLOCK_STATE_DEAD;
-
-		yaffs_trace(YAFFS_TRACE_SCAN_DEBUG,
-			"Block scanning block %d state %d seq %d",
-			blk, state, seq_number);
-
-		if (state == YAFFS_BLOCK_STATE_DEAD) {
-			yaffs_trace(YAFFS_TRACE_BAD_BLOCKS,
-				"block %d is bad", blk);
-		} else if (state == YAFFS_BLOCK_STATE_EMPTY) {
-			yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, "Block empty ");
-			dev->n_erased_blocks++;
-			dev->n_free_chunks += dev->param.chunks_per_block;
-		}
-		bi++;
-	}
-
-	/* For each block.... */
-	for (blk = dev->internal_start_block;
-	     !alloc_failed && blk <= dev->internal_end_block; blk++) {
-
-		cond_resched();
-
-		bi = yaffs_get_block_info(dev, blk);
-		state = bi->block_state;
-
-		deleted = 0;
-
-		/* For each chunk in each block that needs scanning.... */
-		for (c = 0;
-			!alloc_failed && c < dev->param.chunks_per_block &&
-			state == YAFFS_BLOCK_STATE_NEEDS_SCAN; c++) {
-			/* Read the tags and decide what to do */
-			chunk = blk * dev->param.chunks_per_block + c;
-
-			result = yaffs_rd_chunk_tags_nand(dev, chunk, NULL,
-							  &tags);
-
-			/* Let's have a good look at this chunk... */
-
-			if (tags.ecc_result == YAFFS_ECC_RESULT_UNFIXED ||
-			    tags.is_deleted) {
-				/* YAFFS1 only...
-				 * A deleted chunk
-				 */
-				deleted++;
-				dev->n_free_chunks++;
-			} else if (!tags.chunk_used) {
-				/* An unassigned chunk in the block
-				 * This means that either the block is empty or
-				 * this is the one being allocated from
-				 */
-
-				if (c == 0) {
-					/* We're looking at the first chunk in
-					 *the block so the block is unused */
-					state = YAFFS_BLOCK_STATE_EMPTY;
-					dev->n_erased_blocks++;
-				} else {
-					/* this is the block being allocated */
-					yaffs_trace(YAFFS_TRACE_SCAN,
-						" Allocating from %d %d",
-						blk, c);
-					state = YAFFS_BLOCK_STATE_ALLOCATING;
-					dev->alloc_block = blk;
-					dev->alloc_page = c;
-					dev->alloc_block_finder = blk;
-
-				}
-
-				dev->n_free_chunks +=
-				    (dev->param.chunks_per_block - c);
-			} else if (tags.chunk_id > 0) {
-				/* chunk_id > 0 so it is a data chunk... */
-				unsigned int endpos;
-
-				yaffs_set_chunk_bit(dev, blk, c);
-				bi->pages_in_use++;
-
-				in = yaffs_find_or_create_by_number(dev,
-							tags.obj_id,
-							YAFFS_OBJECT_TYPE_FILE);
-				/* PutChunkIntoFile checks for a clash
-				 * (two data chunks with the same chunk_id).
-				 */
-
-				if (!in)
-					alloc_failed = 1;
-
-				if (in) {
-					if (!yaffs_put_chunk_in_file
-					    (in, tags.chunk_id, chunk, 1))
-						alloc_failed = 1;
-				}
-
-				endpos =
-				    (tags.chunk_id - 1) *
-				    dev->data_bytes_per_chunk +
-				    tags.n_bytes;
-				if (in &&
-				    in->variant_type ==
-				     YAFFS_OBJECT_TYPE_FILE &&
-				    in->variant.file_variant.scanned_size <
-				      endpos) {
-					in->variant.file_variant.scanned_size =
-					    endpos;
-					if (!dev->param.use_header_file_size) {
-						in->variant.
-						    file_variant.file_size =
-						    in->variant.
-						    file_variant.scanned_size;
-					}
-
-				}
-			} else {
-				/* chunk_id == 0, so it is an ObjectHeader.
-				 * Make the object
-				 */
-				yaffs_set_chunk_bit(dev, blk, c);
-				bi->pages_in_use++;
-
-				result = yaffs_rd_chunk_tags_nand(dev, chunk,
-								  chunk_data,
-								  NULL);
-
-				oh = (struct yaffs_obj_hdr *)chunk_data;
-
-				in = yaffs_find_by_number(dev, tags.obj_id);
-				if (in && in->variant_type != oh->type) {
-					/* This should not happen, but somehow
-					 * Wev'e ended up with an obj_id that
-					 * has been reused but not yet deleted,
-					 * and worse still it has changed type.
-					 * Delete the old object.
-					 */
-
-					yaffs_del_obj(in);
-					in = NULL;
-				}
-
-				in = yaffs_find_or_create_by_number(dev,
-								tags.obj_id,
-								oh->type);
-
-				if (!in)
-					alloc_failed = 1;
-
-				if (in && oh->shadows_obj > 0) {
-
-					struct yaffs_shadow_fixer *fixer;
-					fixer =
-						kmalloc(sizeof
-						(struct yaffs_shadow_fixer),
-						GFP_NOFS);
-					if (fixer) {
-						fixer->next = shadow_fixers;
-						shadow_fixers = fixer;
-						fixer->obj_id = tags.obj_id;
-						fixer->shadowed_id =
-						    oh->shadows_obj;
-						yaffs_trace(YAFFS_TRACE_SCAN,
-							" Shadow fixer: %d shadows %d",
-							fixer->obj_id,
-							fixer->shadowed_id);
-
-					}
-
-				}
-
-				if (in && in->valid) {
-					/* We have already filled this one.
-					 * We have a duplicate and need to
-					 * resolve it. */
-
-					unsigned existing_serial = in->serial;
-					unsigned new_serial =
-					    tags.serial_number;
-
-					if (((existing_serial + 1) & 3) ==
-					    new_serial) {
-						/* Use new one - destroy the
-						 * exisiting one */
-						yaffs_chunk_del(dev,
-								in->hdr_chunk,
-								1, __LINE__);
-						in->valid = 0;
-					} else {
-						/* Use existing - destroy
-						 * this one. */
-						yaffs_chunk_del(dev, chunk, 1,
-								__LINE__);
-					}
-				}
-
-				if (in && !in->valid &&
-				    (tags.obj_id == YAFFS_OBJECTID_ROOT ||
-				     tags.obj_id ==
-				     YAFFS_OBJECTID_LOSTNFOUND)) {
-					/* We only load some info, don't fiddle
-					 * with directory structure */
-					in->valid = 1;
-					in->variant_type = oh->type;
-
-					in->yst_mode = oh->yst_mode;
-					yaffs_load_attribs(in, oh);
-					in->hdr_chunk = chunk;
-					in->serial = tags.serial_number;
-
-				} else if (in && !in->valid) {
-					/* we need to load this info */
-
-					in->valid = 1;
-					in->variant_type = oh->type;
-
-					in->yst_mode = oh->yst_mode;
-					yaffs_load_attribs(in, oh);
-					in->hdr_chunk = chunk;
-					in->serial = tags.serial_number;
-
-					yaffs_set_obj_name_from_oh(in, oh);
-					in->dirty = 0;
-
-					/* directory stuff...
-					 * hook up to parent
-					 */
-
-					parent =
-					    yaffs_find_or_create_by_number
-					    (dev, oh->parent_obj_id,
-					     YAFFS_OBJECT_TYPE_DIRECTORY);
-					if (!parent)
-						alloc_failed = 1;
-					if (parent && parent->variant_type ==
-					    YAFFS_OBJECT_TYPE_UNKNOWN) {
-						/* Set up as a directory */
-						parent->variant_type =
-						    YAFFS_OBJECT_TYPE_DIRECTORY;
-						INIT_LIST_HEAD(&parent->
-							variant.dir_variant.
-							children);
-					} else if (!parent ||
-						parent->variant_type !=
-						YAFFS_OBJECT_TYPE_DIRECTORY) {
-						/* Hoosterman, a problem....
-						 * We're trying to use a
-						 * non-directory as a directory
-						 */
-
-						yaffs_trace(YAFFS_TRACE_ERROR,
-							"yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
-							);
-						parent = dev->lost_n_found;
-					}
-
-					yaffs_add_obj_to_dir(parent, in);
-
-					switch (in->variant_type) {
-					case YAFFS_OBJECT_TYPE_UNKNOWN:
-						/* Todo got a problem */
-						break;
-					case YAFFS_OBJECT_TYPE_FILE:
-						if (dev->param.
-						    use_header_file_size)
-							in->variant.
-							file_variant.file_size
-							= yaffs_oh_to_size(oh);
-						break;
-					case YAFFS_OBJECT_TYPE_HARDLINK:
-						in->variant.
-						    hardlink_variant.equiv_id =
-						    oh->equiv_id;
-						list_add(&in->hard_links,
-								&hard_list);
-						break;
-					case YAFFS_OBJECT_TYPE_DIRECTORY:
-						/* Do nothing */
-						break;
-					case YAFFS_OBJECT_TYPE_SPECIAL:
-						/* Do nothing */
-						break;
-					case YAFFS_OBJECT_TYPE_SYMLINK:
-						in->variant.symlink_variant.
-						    alias =
-						    yaffs_clone_str(oh->alias);
-						if (!in->variant.
-						    symlink_variant.alias)
-							alloc_failed = 1;
-						break;
-					}
-				}
-			}
-		}
-
-		if (state == YAFFS_BLOCK_STATE_NEEDS_SCAN) {
-			/* If we got this far while scanning,
-			 * then the block is fully allocated. */
-			state = YAFFS_BLOCK_STATE_FULL;
-		}
-
-		if (state == YAFFS_BLOCK_STATE_ALLOCATING) {
-			/* If the block was partially allocated then
-			 * treat it as fully allocated. */
-			state = YAFFS_BLOCK_STATE_FULL;
-			dev->alloc_block = -1;
-		}
-
-		bi->block_state = state;
-
-		/* Now let's see if it was dirty */
-		if (bi->pages_in_use == 0 &&
-		    !bi->has_shrink_hdr &&
-		    bi->block_state == YAFFS_BLOCK_STATE_FULL)
-			yaffs_block_became_dirty(dev, blk);
-	}
-
-	/* Ok, we've done all the scanning.
-	 * Fix up the hard link chains.
-	 * We should now have scanned all the objects, now it's time to add
-	 * these hardlinks.
-	 */
-
-	yaffs_link_fixup(dev, &hard_list);
-
-	/*
-	 * Fix up any shadowed objects.
-	 * There should not be more than one of these.
-	 */
-	{
-		struct yaffs_shadow_fixer *fixer;
-		struct yaffs_obj *obj;
-
-		while (shadow_fixers) {
-			fixer = shadow_fixers;
-			shadow_fixers = fixer->next;
-			/* Complete the rename transaction by deleting the
-			 * shadowed object then setting the object header
-			 to unshadowed.
-			 */
-			obj = yaffs_find_by_number(dev, fixer->shadowed_id);
-			if (obj)
-				yaffs_del_obj(obj);
-
-			obj = yaffs_find_by_number(dev, fixer->obj_id);
-
-			if (obj)
-				yaffs_update_oh(obj, NULL, 1, 0, 0, NULL);
-
-			kfree(fixer);
-		}
-	}
-
-	yaffs_release_temp_buffer(dev, chunk_data);
-
-	if (alloc_failed)
-		return YAFFS_FAIL;
-
-	yaffs_trace(YAFFS_TRACE_SCAN, "yaffs1_scan ends");
-
-	return YAFFS_OK;
-}

target/linux/generic/files/fs/yaffs2/yaffs_yaffs1.h

@@ -1,22 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License version 2.1 as
- * published by the Free Software Foundation.
- *
- * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
- */
-
-#ifndef __YAFFS_YAFFS1_H__
-#define __YAFFS_YAFFS1_H__
-
-#include "yaffs_guts.h"
-int yaffs1_scan(struct yaffs_dev *dev);
-
-#endif

target/linux/generic/files/fs/yaffs2/yaffs_yaffs2.c

@@ -1,1532 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include "yaffs_guts.h"
-#include "yaffs_trace.h"
-#include "yaffs_yaffs2.h"
-#include "yaffs_checkptrw.h"
-#include "yaffs_bitmap.h"
-#include "yaffs_nand.h"
-#include "yaffs_getblockinfo.h"
-#include "yaffs_verify.h"
-#include "yaffs_attribs.h"
-#include "yaffs_summary.h"
-
-/*
- * Checkpoints are really no benefit on very small partitions.
- *
- * To save space on small partitions don't bother with checkpoints unless
- * the partition is at least this big.
- */
-#define YAFFS_CHECKPOINT_MIN_BLOCKS 60
-#define YAFFS_SMALL_HOLE_THRESHOLD 4
-
-/*
- * Oldest Dirty Sequence Number handling.
- */
-
-/* yaffs_calc_oldest_dirty_seq()
- * yaffs2_find_oldest_dirty_seq()
- * Calculate the oldest dirty sequence number if we don't know it.
- */
-void yaffs_calc_oldest_dirty_seq(struct yaffs_dev *dev)
-{
-	int i;
-	unsigned seq;
-	unsigned block_no = 0;
-	struct yaffs_block_info *b;
-
-	if (!dev->param.is_yaffs2)
-		return;
-
-	/* Find the oldest dirty sequence number. */
-	seq = dev->seq_number + 1;
-	b = dev->block_info;
-	for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
-		if (b->block_state == YAFFS_BLOCK_STATE_FULL &&
-		    (b->pages_in_use - b->soft_del_pages) <
-		    dev->param.chunks_per_block &&
-		    b->seq_number < seq) {
-			seq = b->seq_number;
-			block_no = i;
-		}
-		b++;
-	}
-
-	if (block_no) {
-		dev->oldest_dirty_seq = seq;
-		dev->oldest_dirty_block = block_no;
-	}
-}
-
-void yaffs2_find_oldest_dirty_seq(struct yaffs_dev *dev)
-{
-	if (!dev->param.is_yaffs2)
-		return;
-
-	if (!dev->oldest_dirty_seq)
-		yaffs_calc_oldest_dirty_seq(dev);
-}
-
-/*
- * yaffs_clear_oldest_dirty_seq()
- * Called when a block is erased or marked bad. (ie. when its seq_number
- * becomes invalid). If the value matches the oldest then we clear
- * dev->oldest_dirty_seq to force its recomputation.
- */
-void yaffs2_clear_oldest_dirty_seq(struct yaffs_dev *dev,
-				   struct yaffs_block_info *bi)
-{
-
-	if (!dev->param.is_yaffs2)
-		return;
-
-	if (!bi || bi->seq_number == dev->oldest_dirty_seq) {
-		dev->oldest_dirty_seq = 0;
-		dev->oldest_dirty_block = 0;
-	}
-}
-
-/*
- * yaffs2_update_oldest_dirty_seq()
- * Update the oldest dirty sequence number whenever we dirty a block.
- * Only do this if the oldest_dirty_seq is actually being tracked.
- */
-void yaffs2_update_oldest_dirty_seq(struct yaffs_dev *dev, unsigned block_no,
-				    struct yaffs_block_info *bi)
-{
-	if (!dev->param.is_yaffs2)
-		return;
-
-	if (dev->oldest_dirty_seq) {
-		if (dev->oldest_dirty_seq > bi->seq_number) {
-			dev->oldest_dirty_seq = bi->seq_number;
-			dev->oldest_dirty_block = block_no;
-		}
-	}
-}
-
-int yaffs_block_ok_for_gc(struct yaffs_dev *dev, struct yaffs_block_info *bi)
-{
-
-	if (!dev->param.is_yaffs2)
-		return 1;	/* disqualification only applies to yaffs2. */
-
-	if (!bi->has_shrink_hdr)
-		return 1;	/* can gc */
-
-	yaffs2_find_oldest_dirty_seq(dev);
-
-	/* Can't do gc of this block if there are any blocks older than this
-	 * one that have discarded pages.
-	 */
-	return (bi->seq_number <= dev->oldest_dirty_seq);
-}
-
-/*
- * yaffs2_find_refresh_block()
- * periodically finds the oldest full block by sequence number for refreshing.
- * Only for yaffs2.
- */
-u32 yaffs2_find_refresh_block(struct yaffs_dev *dev)
-{
-	u32 b;
-	u32 oldest = 0;
-	u32 oldest_seq = 0;
-	struct yaffs_block_info *bi;
-
-	if (!dev->param.is_yaffs2)
-		return oldest;
-
-	/*
-	 * If refresh period < 10 then refreshing is disabled.
-	 */
-	if (dev->param.refresh_period < 10)
-		return oldest;
-
-	/*
-	 * Fix broken values.
-	 */
-	if (dev->refresh_skip > dev->param.refresh_period)
-		dev->refresh_skip = dev->param.refresh_period;
-
-	if (dev->refresh_skip > 0)
-		return oldest;
-
-	/*
-	 * Refresh skip is now zero.
-	 * We'll do a refresh this time around....
-	 * Update the refresh skip and find the oldest block.
-	 */
-	dev->refresh_skip = dev->param.refresh_period;
-	dev->refresh_count++;
-	bi = dev->block_info;
-	for (b = dev->internal_start_block; b <= dev->internal_end_block; b++) {
-
-		if (bi->block_state == YAFFS_BLOCK_STATE_FULL) {
-
-			if (oldest < 1 || bi->seq_number < oldest_seq) {
-				oldest = b;
-				oldest_seq = bi->seq_number;
-			}
-		}
-		bi++;
-	}
-
-	if (oldest > 0) {
-		yaffs_trace(YAFFS_TRACE_GC,
-			"GC refresh count %d selected block %d with seq_number %d",
-			dev->refresh_count, oldest, oldest_seq);
-	}
-
-	return oldest;
-}
-
-int yaffs2_checkpt_required(struct yaffs_dev *dev)
-{
-	int nblocks;
-
-	if (!dev->param.is_yaffs2)
-		return 0;
-
-	nblocks = dev->internal_end_block - dev->internal_start_block + 1;
-
-	return !dev->param.skip_checkpt_wr &&
-	    !dev->read_only && (nblocks >= YAFFS_CHECKPOINT_MIN_BLOCKS);
-}
-
-int yaffs_calc_checkpt_blocks_required(struct yaffs_dev *dev)
-{
-	int retval;
-	int n_bytes = 0;
-	int n_blocks;
-	int dev_blocks;
-
-	if (!dev->param.is_yaffs2)
-		return 0;
-
-	if (!dev->checkpoint_blocks_required && yaffs2_checkpt_required(dev)) {
-		/* Not a valid value so recalculate */
-		dev_blocks = dev->param.end_block - dev->param.start_block + 1;
-		n_bytes += sizeof(struct yaffs_checkpt_validity);
-		n_bytes += sizeof(struct yaffs_checkpt_dev);
-		n_bytes += dev_blocks * sizeof(struct yaffs_block_info);
-		n_bytes += dev_blocks * dev->chunk_bit_stride;
-		n_bytes +=
-		    (sizeof(struct yaffs_checkpt_obj) + sizeof(u32)) *
-		    dev->n_obj;
-		n_bytes += (dev->tnode_size + sizeof(u32)) * dev->n_tnodes;
-		n_bytes += sizeof(struct yaffs_checkpt_validity);
-		n_bytes += sizeof(u32);	/* checksum */
-
-		/* Round up and add 2 blocks to allow for some bad blocks,
-		 * so add 3 */
-
-		n_blocks =
-		    (n_bytes /
-		     (dev->data_bytes_per_chunk *
-		      dev->param.chunks_per_block)) + 3;
-
-		dev->checkpoint_blocks_required = n_blocks;
-	}
-
-	retval = dev->checkpoint_blocks_required - dev->blocks_in_checkpt;
-	if (retval < 0)
-		retval = 0;
-	return retval;
-}
-
-/*--------------------- Checkpointing --------------------*/
-
-static int yaffs2_wr_checkpt_validity_marker(struct yaffs_dev *dev, int head)
-{
-	struct yaffs_checkpt_validity cp;
-
-	memset(&cp, 0, sizeof(cp));
-
-	cp.struct_type = sizeof(cp);
-	cp.magic = YAFFS_MAGIC;
-	cp.version = YAFFS_CHECKPOINT_VERSION;
-	cp.head = (head) ? 1 : 0;
-
-	return (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp)) ? 1 : 0;
-}
-
-static int yaffs2_rd_checkpt_validity_marker(struct yaffs_dev *dev, int head)
-{
-	struct yaffs_checkpt_validity cp;
-	int ok;
-
-	ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == sizeof(cp));
-
-	if (ok)
-		ok = (cp.struct_type == sizeof(cp)) &&
-		    (cp.magic == YAFFS_MAGIC) &&
-		    (cp.version == YAFFS_CHECKPOINT_VERSION) &&
-		    (cp.head == ((head) ? 1 : 0));
-	return ok ? 1 : 0;
-}
-
-static void yaffs2_dev_to_checkpt_dev(struct yaffs_checkpt_dev *cp,
-				      struct yaffs_dev *dev)
-{
-	cp->n_erased_blocks = dev->n_erased_blocks;
-	cp->alloc_block = dev->alloc_block;
-	cp->alloc_page = dev->alloc_page;
-	cp->n_free_chunks = dev->n_free_chunks;
-
-	cp->n_deleted_files = dev->n_deleted_files;
-	cp->n_unlinked_files = dev->n_unlinked_files;
-	cp->n_bg_deletions = dev->n_bg_deletions;
-	cp->seq_number = dev->seq_number;
-
-}
-
-static void yaffs_checkpt_dev_to_dev(struct yaffs_dev *dev,
-				     struct yaffs_checkpt_dev *cp)
-{
-	dev->n_erased_blocks = cp->n_erased_blocks;
-	dev->alloc_block = cp->alloc_block;
-	dev->alloc_page = cp->alloc_page;
-	dev->n_free_chunks = cp->n_free_chunks;
-
-	dev->n_deleted_files = cp->n_deleted_files;
-	dev->n_unlinked_files = cp->n_unlinked_files;
-	dev->n_bg_deletions = cp->n_bg_deletions;
-	dev->seq_number = cp->seq_number;
-}
-
-static int yaffs2_wr_checkpt_dev(struct yaffs_dev *dev)
-{
-	struct yaffs_checkpt_dev cp;
-	u32 n_bytes;
-	u32 n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
-	int ok;
-
-	/* Write device runtime values */
-	yaffs2_dev_to_checkpt_dev(&cp, dev);
-	cp.struct_type = sizeof(cp);
-
-	ok = (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp));
-	if (!ok)
-		return 0;
-
-	/* Write block info */
-	n_bytes = n_blocks * sizeof(struct yaffs_block_info);
-	ok = (yaffs2_checkpt_wr(dev, dev->block_info, n_bytes) == n_bytes);
-	if (!ok)
-		return 0;
-
-	/* Write chunk bits */
-	n_bytes = n_blocks * dev->chunk_bit_stride;
-	ok = (yaffs2_checkpt_wr(dev, dev->chunk_bits, n_bytes) == n_bytes);
-
-	return ok ? 1 : 0;
-}
-
-static int yaffs2_rd_checkpt_dev(struct yaffs_dev *dev)
-{
-	struct yaffs_checkpt_dev cp;
-	u32 n_bytes;
-	u32 n_blocks =
-	    (dev->internal_end_block - dev->internal_start_block + 1);
-	int ok;
-
-	ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == sizeof(cp));
-	if (!ok)
-		return 0;
-
-	if (cp.struct_type != sizeof(cp))
-		return 0;
-
-	yaffs_checkpt_dev_to_dev(dev, &cp);
-
-	n_bytes = n_blocks * sizeof(struct yaffs_block_info);
-
-	ok = (yaffs2_checkpt_rd(dev, dev->block_info, n_bytes) == n_bytes);
-
-	if (!ok)
-		return 0;
-
-	n_bytes = n_blocks * dev->chunk_bit_stride;
-
-	ok = (yaffs2_checkpt_rd(dev, dev->chunk_bits, n_bytes) == n_bytes);
-
-	return ok ? 1 : 0;
-}
-
-static void yaffs2_obj_checkpt_obj(struct yaffs_checkpt_obj *cp,
-				   struct yaffs_obj *obj)
-{
-	cp->obj_id = obj->obj_id;
-	cp->parent_id = (obj->parent) ? obj->parent->obj_id : 0;
-	cp->hdr_chunk = obj->hdr_chunk;
-	cp->variant_type = obj->variant_type;
-	cp->deleted = obj->deleted;
-	cp->soft_del = obj->soft_del;
-	cp->unlinked = obj->unlinked;
-	cp->fake = obj->fake;
-	cp->rename_allowed = obj->rename_allowed;
-	cp->unlink_allowed = obj->unlink_allowed;
-	cp->serial = obj->serial;
-	cp->n_data_chunks = obj->n_data_chunks;
-
-	if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
-		cp->size_or_equiv_obj = obj->variant.file_variant.file_size;
-	else if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK)
-		cp->size_or_equiv_obj = obj->variant.hardlink_variant.equiv_id;
-}
-
-static int yaffs2_checkpt_obj_to_obj(struct yaffs_obj *obj,
-				     struct yaffs_checkpt_obj *cp)
-{
-	struct yaffs_obj *parent;
-
-	if (obj->variant_type != cp->variant_type) {
-		yaffs_trace(YAFFS_TRACE_ERROR,
-			"Checkpoint read object %d type %d chunk %d does not match existing object type %d",
-			cp->obj_id, cp->variant_type, cp->hdr_chunk,
-			obj->variant_type);
-		return 0;
-	}
-
-	obj->obj_id = cp->obj_id;
-
-	if (cp->parent_id)
-		parent = yaffs_find_or_create_by_number(obj->my_dev,
-						cp->parent_id,
-						YAFFS_OBJECT_TYPE_DIRECTORY);
-	else
-		parent = NULL;
-
-	if (parent) {
-		if (parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
-			yaffs_trace(YAFFS_TRACE_ALWAYS,
-				"Checkpoint read object %d parent %d type %d chunk %d Parent type, %d, not directory",
-				cp->obj_id, cp->parent_id,
-				cp->variant_type, cp->hdr_chunk,
-				parent->variant_type);
-			return 0;
-		}
-		yaffs_add_obj_to_dir(parent, obj);
-	}
-
-	obj->hdr_chunk = cp->hdr_chunk;
-	obj->variant_type = cp->variant_type;
-	obj->deleted = cp->deleted;
-	obj->soft_del = cp->soft_del;
-	obj->unlinked = cp->unlinked;
-	obj->fake = cp->fake;
-	obj->rename_allowed = cp->rename_allowed;
-	obj->unlink_allowed = cp->unlink_allowed;
-	obj->serial = cp->serial;
-	obj->n_data_chunks = cp->n_data_chunks;
-
-	if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
-		obj->variant.file_variant.file_size = cp->size_or_equiv_obj;
-	else if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK)
-		obj->variant.hardlink_variant.equiv_id = cp->size_or_equiv_obj;
-
-	if (obj->hdr_chunk > 0)
-		obj->lazy_loaded = 1;
-	return 1;
-}
-
-static int yaffs2_checkpt_tnode_worker(struct yaffs_obj *in,
-				       struct yaffs_tnode *tn, u32 level,
-				       int chunk_offset)
-{
-	int i;
-	struct yaffs_dev *dev = in->my_dev;
-	int ok = 1;
-	u32 base_offset;
-
-	if (!tn)
-		return 1;
-
-	if (level > 0) {
-		for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
-			if (!tn->internal[i])
-				continue;
-			ok = yaffs2_checkpt_tnode_worker(in,
-				 tn->internal[i],
-				 level - 1,
-				 (chunk_offset <<
-				  YAFFS_TNODES_INTERNAL_BITS) + i);
-		}
-		return ok;
-	}
-
-	/* Level 0 tnode */
-	base_offset = chunk_offset << YAFFS_TNODES_LEVEL0_BITS;
-	ok = (yaffs2_checkpt_wr(dev, &base_offset, sizeof(base_offset)) ==
-			sizeof(base_offset));
-	if (ok)
-		ok = (yaffs2_checkpt_wr(dev, tn, dev->tnode_size) ==
-			dev->tnode_size);
-
-	return ok;
-}
-
-static int yaffs2_wr_checkpt_tnodes(struct yaffs_obj *obj)
-{
-	u32 end_marker = ~0;
-	int ok = 1;
-
-	if (obj->variant_type != YAFFS_OBJECT_TYPE_FILE)
-		return ok;
-
-	ok = yaffs2_checkpt_tnode_worker(obj,
-					 obj->variant.file_variant.top,
-					 obj->variant.file_variant.
-					 top_level, 0);
-	if (ok)
-		ok = (yaffs2_checkpt_wr(obj->my_dev, &end_marker,
-				sizeof(end_marker)) == sizeof(end_marker));
-
-	return ok ? 1 : 0;
-}
-
-static int yaffs2_rd_checkpt_tnodes(struct yaffs_obj *obj)
-{
-	u32 base_chunk;
-	int ok = 1;
-	struct yaffs_dev *dev = obj->my_dev;
-	struct yaffs_file_var *file_stuct_ptr = &obj->variant.file_variant;
-	struct yaffs_tnode *tn;
-	int nread = 0;
-
-	ok = (yaffs2_checkpt_rd(dev, &base_chunk, sizeof(base_chunk)) ==
-	      sizeof(base_chunk));
-
-	while (ok && (~base_chunk)) {
-		nread++;
-		/* Read level 0 tnode */
-
-		tn = yaffs_get_tnode(dev);
-		if (tn)
-			ok = (yaffs2_checkpt_rd(dev, tn, dev->tnode_size) ==
-				dev->tnode_size);
-		else
-			ok = 0;
-
-		if (tn && ok)
-			ok = yaffs_add_find_tnode_0(dev,
-						    file_stuct_ptr,
-						    base_chunk, tn) ? 1 : 0;
-
-		if (ok)
-			ok = (yaffs2_checkpt_rd
-			      (dev, &base_chunk,
-			       sizeof(base_chunk)) == sizeof(base_chunk));
-	}
-
-	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
-		"Checkpoint read tnodes %d records, last %d. ok %d",
-		nread, base_chunk, ok);
-
-	return ok ? 1 : 0;
-}
-
-static int yaffs2_wr_checkpt_objs(struct yaffs_dev *dev)
-{
-	struct yaffs_obj *obj;
-	struct yaffs_checkpt_obj cp;
-	int i;
-	int ok = 1;
-	struct list_head *lh;
-
-	/* Iterate through the objects in each hash entry,
-	 * dumping them to the checkpointing stream.
-	 */
-
-	for (i = 0; ok && i < YAFFS_NOBJECT_BUCKETS; i++) {
-		list_for_each(lh, &dev->obj_bucket[i].list) {
-			obj = list_entry(lh, struct yaffs_obj, hash_link);
-			if (!obj->defered_free) {
-				yaffs2_obj_checkpt_obj(&cp, obj);
-				cp.struct_type = sizeof(cp);
-
-				yaffs_trace(YAFFS_TRACE_CHECKPOINT,
-					"Checkpoint write object %d parent %d type %d chunk %d obj addr %p",
-					cp.obj_id, cp.parent_id,
-					cp.variant_type, cp.hdr_chunk, obj);
-
-				ok = (yaffs2_checkpt_wr(dev, &cp,
-						sizeof(cp)) == sizeof(cp));
-
-				if (ok &&
-					obj->variant_type ==
-					YAFFS_OBJECT_TYPE_FILE)
-					ok = yaffs2_wr_checkpt_tnodes(obj);
-			}
-		}
-	}
-
-	/* Dump end of list */
-	memset(&cp, 0xff, sizeof(struct yaffs_checkpt_obj));
-	cp.struct_type = sizeof(cp);
-
-	if (ok)
-		ok = (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp));
-
-	return ok ? 1 : 0;
-}
-
-static int yaffs2_rd_checkpt_objs(struct yaffs_dev *dev)
-{
-	struct yaffs_obj *obj;
-	struct yaffs_checkpt_obj cp;
-	int ok = 1;
-	int done = 0;
-	LIST_HEAD(hard_list);
-
-
-	while (ok && !done) {
-		ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == sizeof(cp));
-		if (cp.struct_type != sizeof(cp)) {
-			yaffs_trace(YAFFS_TRACE_CHECKPOINT,
-				"struct size %d instead of %d ok %d",
-				cp.struct_type, (int)sizeof(cp), ok);
-			ok = 0;
-		}
-
-		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
-			"Checkpoint read object %d parent %d type %d chunk %d ",
-			cp.obj_id, cp.parent_id, cp.variant_type,
-			cp.hdr_chunk);
-
-		if (ok && cp.obj_id == ~0) {
-			done = 1;
-		} else if (ok) {
-			obj =
-			    yaffs_find_or_create_by_number(dev, cp.obj_id,
-							   cp.variant_type);
-			if (obj) {
-				ok = yaffs2_checkpt_obj_to_obj(obj, &cp);
-				if (!ok)
-					break;
-				if (obj->variant_type ==
-					YAFFS_OBJECT_TYPE_FILE) {
-					ok = yaffs2_rd_checkpt_tnodes(obj);
-				} else if (obj->variant_type ==
-					YAFFS_OBJECT_TYPE_HARDLINK) {
-					list_add(&obj->hard_links, &hard_list);
-				}
-			} else {
-				ok = 0;
-			}
-		}
-	}
-
-	if (ok)
-		yaffs_link_fixup(dev, &hard_list);
-
-	return ok ? 1 : 0;
-}
-
-static int yaffs2_wr_checkpt_sum(struct yaffs_dev *dev)
-{
-	u32 checkpt_sum;
-	int ok;
-
-	yaffs2_get_checkpt_sum(dev, &checkpt_sum);
-
-	ok = (yaffs2_checkpt_wr(dev, &checkpt_sum, sizeof(checkpt_sum)) ==
-		sizeof(checkpt_sum));
-
-	if (!ok)
-		return 0;
-
-	return 1;
-}
-
-static int yaffs2_rd_checkpt_sum(struct yaffs_dev *dev)
-{
-	u32 checkpt_sum0;
-	u32 checkpt_sum1;
-	int ok;
-
-	yaffs2_get_checkpt_sum(dev, &checkpt_sum0);
-
-	ok = (yaffs2_checkpt_rd(dev, &checkpt_sum1, sizeof(checkpt_sum1)) ==
-		sizeof(checkpt_sum1));
-
-	if (!ok)
-		return 0;
-
-	if (checkpt_sum0 != checkpt_sum1)
-		return 0;
-
-	return 1;
-}
-
-static int yaffs2_wr_checkpt_data(struct yaffs_dev *dev)
-{
-	int ok = 1;
-
-	if (!yaffs2_checkpt_required(dev)) {
-		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
-			"skipping checkpoint write");
-		ok = 0;
-	}
-
-	if (ok)
-		ok = yaffs2_checkpt_open(dev, 1);
-
-	if (ok) {
-		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
-			"write checkpoint validity");
-		ok = yaffs2_wr_checkpt_validity_marker(dev, 1);
-	}
-	if (ok) {
-		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
-			"write checkpoint device");
-		ok = yaffs2_wr_checkpt_dev(dev);
-	}
-	if (ok) {
-		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
-			"write checkpoint objects");
-		ok = yaffs2_wr_checkpt_objs(dev);
-	}
-	if (ok) {
-		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
-			"write checkpoint validity");
-		ok = yaffs2_wr_checkpt_validity_marker(dev, 0);
-	}
-
-	if (ok)
-		ok = yaffs2_wr_checkpt_sum(dev);
-
-	if (!yaffs_checkpt_close(dev))
-		ok = 0;
-
-	if (ok)
-		dev->is_checkpointed = 1;
-	else
-		dev->is_checkpointed = 0;
-
-	return dev->is_checkpointed;
-}
-
-static int yaffs2_rd_checkpt_data(struct yaffs_dev *dev)
-{
-	int ok = 1;
-
-	if (!dev->param.is_yaffs2)
-		ok = 0;
-
-	if (ok && dev->param.skip_checkpt_rd) {
-		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
-			"skipping checkpoint read");
-		ok = 0;
-	}
-
-	if (ok)
-		ok = yaffs2_checkpt_open(dev, 0); /* open for read */
-
-	if (ok) {
-		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
-			"read checkpoint validity");
-		ok = yaffs2_rd_checkpt_validity_marker(dev, 1);
-	}
-	if (ok) {
-		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
-			"read checkpoint device");
-		ok = yaffs2_rd_checkpt_dev(dev);
-	}
-	if (ok) {
-		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
-			"read checkpoint objects");
-		ok = yaffs2_rd_checkpt_objs(dev);
-	}
-	if (ok) {
-		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
-			"read checkpoint validity");
-		ok = yaffs2_rd_checkpt_validity_marker(dev, 0);
-	}
-
-	if (ok) {
-		ok = yaffs2_rd_checkpt_sum(dev);
-		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
-			"read checkpoint checksum %d", ok);
-	}
-
-	if (!yaffs_checkpt_close(dev))
-		ok = 0;
-
-	if (ok)
-		dev->is_checkpointed = 1;
-	else
-		dev->is_checkpointed = 0;
-
-	return ok ? 1 : 0;
-}
-
-void yaffs2_checkpt_invalidate(struct yaffs_dev *dev)
-{
-	if (dev->is_checkpointed || dev->blocks_in_checkpt > 0) {
-		dev->is_checkpointed = 0;
-		yaffs2_checkpt_invalidate_stream(dev);
-	}
-	if (dev->param.sb_dirty_fn)
-		dev->param.sb_dirty_fn(dev);
-}
-
-int yaffs_checkpoint_save(struct yaffs_dev *dev)
-{
-	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
-		"save entry: is_checkpointed %d",
-		dev->is_checkpointed);
-
-	yaffs_verify_objects(dev);
-	yaffs_verify_blocks(dev);
-	yaffs_verify_free_chunks(dev);
-
-	if (!dev->is_checkpointed) {
-		yaffs2_checkpt_invalidate(dev);
-		yaffs2_wr_checkpt_data(dev);
-	}
-
-	yaffs_trace(YAFFS_TRACE_CHECKPOINT | YAFFS_TRACE_MOUNT,
-		"save exit: is_checkpointed %d",
-		dev->is_checkpointed);
-
-	return dev->is_checkpointed;
-}
-
-int yaffs2_checkpt_restore(struct yaffs_dev *dev)
-{
-	int retval;
-
-	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
-		"restore entry: is_checkpointed %d",
-		dev->is_checkpointed);
-
-	retval = yaffs2_rd_checkpt_data(dev);
-
-	if (dev->is_checkpointed) {
-		yaffs_verify_objects(dev);
-		yaffs_verify_blocks(dev);
-		yaffs_verify_free_chunks(dev);
-	}
-
-	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
-		"restore exit: is_checkpointed %d",
-		dev->is_checkpointed);
-
-	return retval;
-}
-
-int yaffs2_handle_hole(struct yaffs_obj *obj, loff_t new_size)
-{
-	/* if new_size > old_file_size.
-	 * We're going to be writing a hole.
-	 * If the hole is small then write zeros otherwise write a start
-	 * of hole marker.
-	 */
-	loff_t old_file_size;
-	loff_t increase;
-	int small_hole;
-	int result = YAFFS_OK;
-	struct yaffs_dev *dev = NULL;
-	u8 *local_buffer = NULL;
-	int small_increase_ok = 0;
-
-	if (!obj)
-		return YAFFS_FAIL;
-
-	if (obj->variant_type != YAFFS_OBJECT_TYPE_FILE)
-		return YAFFS_FAIL;
-
-	dev = obj->my_dev;
-
-	/* Bail out if not yaffs2 mode */
-	if (!dev->param.is_yaffs2)
-		return YAFFS_OK;
-
-	old_file_size = obj->variant.file_variant.file_size;
-
-	if (new_size <= old_file_size)
-		return YAFFS_OK;
-
-	increase = new_size - old_file_size;
-
-	if (increase < YAFFS_SMALL_HOLE_THRESHOLD * dev->data_bytes_per_chunk &&
-	    yaffs_check_alloc_available(dev, YAFFS_SMALL_HOLE_THRESHOLD + 1))
-		small_hole = 1;
-	else
-		small_hole = 0;
-
-	if (small_hole)
-		local_buffer = yaffs_get_temp_buffer(dev);
-
-	if (local_buffer) {
-		/* fill hole with zero bytes */
-		loff_t pos = old_file_size;
-		int this_write;
-		int written;
-		memset(local_buffer, 0, dev->data_bytes_per_chunk);
-		small_increase_ok = 1;
-
-		while (increase > 0 && small_increase_ok) {
-			this_write = increase;
-			if (this_write > dev->data_bytes_per_chunk)
-				this_write = dev->data_bytes_per_chunk;
-			written =
-			    yaffs_do_file_wr(obj, local_buffer, pos, this_write,
-					     0);
-			if (written == this_write) {
-				pos += this_write;
-				increase -= this_write;
-			} else {
-				small_increase_ok = 0;
-			}
-		}
-
-		yaffs_release_temp_buffer(dev, local_buffer);
-
-		/* If out of space then reverse any chunks we've added */
-		if (!small_increase_ok)
-			yaffs_resize_file_down(obj, old_file_size);
-	}
-
-	if (!small_increase_ok &&
-	    obj->parent &&
-	    obj->parent->obj_id != YAFFS_OBJECTID_UNLINKED &&
-	    obj->parent->obj_id != YAFFS_OBJECTID_DELETED) {
-		/* Write a hole start header with the old file size */
-		yaffs_update_oh(obj, NULL, 0, 1, 0, NULL);
-	}
-
-	return result;
-}
-
-struct yaffs_block_index {
-	int seq;
-	int block;
-};
-
-static int yaffs2_ybicmp(const void *a, const void *b)
-{
-	int aseq = ((struct yaffs_block_index *)a)->seq;
-	int bseq = ((struct yaffs_block_index *)b)->seq;
-	int ablock = ((struct yaffs_block_index *)a)->block;
-	int bblock = ((struct yaffs_block_index *)b)->block;
-
-	if (aseq == bseq)
-		return ablock - bblock;
-
-	return aseq - bseq;
-}
-
-static inline int yaffs2_scan_chunk(struct yaffs_dev *dev,
-		struct yaffs_block_info *bi,
-		int blk, int chunk_in_block,
-		int *found_chunks,
-		u8 *chunk_data,
-		struct list_head *hard_list,
-		int summary_available)
-{
-	struct yaffs_obj_hdr *oh;
-	struct yaffs_obj *in;
-	struct yaffs_obj *parent;
-	int equiv_id;
-	loff_t file_size;
-	int is_shrink;
-	int is_unlinked;
-	struct yaffs_ext_tags tags;
-	int result;
-	int alloc_failed = 0;
-	int chunk = blk * dev->param.chunks_per_block + chunk_in_block;
-	struct yaffs_file_var *file_var;
-	struct yaffs_hardlink_var *hl_var;
-	struct yaffs_symlink_var *sl_var;
-
-	if (summary_available) {
-		result = yaffs_summary_fetch(dev, &tags, chunk_in_block);
-		tags.seq_number = bi->seq_number;
-	}
-
-	if (!summary_available || tags.obj_id == 0) {
-		result = yaffs_rd_chunk_tags_nand(dev, chunk, NULL, &tags);
-		dev->tags_used++;
-	} else {
-		dev->summary_used++;
-	}
-
-	/* Let's have a good look at this chunk... */
-
-	if (!tags.chunk_used) {
-		/* An unassigned chunk in the block.
-		 * If there are used chunks after this one, then
-		 * it is a chunk that was skipped due to failing
-		 * the erased check. Just skip it so that it can
-		 * be deleted.
-		 * But, more typically, We get here when this is
-		 * an unallocated chunk and his means that
-		 * either the block is empty or this is the one
-		 * being allocated from
-		 */
-
-		if (*found_chunks) {
-			/* This is a chunk that was skipped due
-			 * to failing the erased check */
-		} else if (chunk_in_block == 0) {
-			/* We're looking at the first chunk in
-			 * the block so the block is unused */
-			bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
-			dev->n_erased_blocks++;
-		} else {
-			if (bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN ||
-			    bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING) {
-				if (dev->seq_number == bi->seq_number) {
-					/* Allocating from this block*/
-					yaffs_trace(YAFFS_TRACE_SCAN,
-					    " Allocating from %d %d",
-					    blk, chunk_in_block);
-
-					bi->block_state =
-						YAFFS_BLOCK_STATE_ALLOCATING;
-					dev->alloc_block = blk;
-					dev->alloc_page = chunk_in_block;
-					dev->alloc_block_finder = blk;
-				} else {
-					/* This is a partially written block
-					 * that is not the current
-					 * allocation block.
-					 */
-					yaffs_trace(YAFFS_TRACE_SCAN,
-						"Partially written block %d detected. gc will fix this.",
-						blk);
-				}
-			}
-		}
-
-		dev->n_free_chunks++;
-
-	} else if (tags.ecc_result ==
-		YAFFS_ECC_RESULT_UNFIXED) {
-		yaffs_trace(YAFFS_TRACE_SCAN,
-			" Unfixed ECC in chunk(%d:%d), chunk ignored",
-			blk, chunk_in_block);
-			dev->n_free_chunks++;
-	} else if (tags.obj_id > YAFFS_MAX_OBJECT_ID ||
-		   tags.chunk_id > YAFFS_MAX_CHUNK_ID ||
-		   tags.obj_id == YAFFS_OBJECTID_SUMMARY ||
-		   (tags.chunk_id > 0 &&
-		     tags.n_bytes > dev->data_bytes_per_chunk) ||
-		   tags.seq_number != bi->seq_number) {
-		yaffs_trace(YAFFS_TRACE_SCAN,
-			"Chunk (%d:%d) with bad tags:obj = %d, chunk_id = %d, n_bytes = %d, ignored",
-			blk, chunk_in_block, tags.obj_id,
-			tags.chunk_id, tags.n_bytes);
-		dev->n_free_chunks++;
-	} else if (tags.chunk_id > 0) {
-		/* chunk_id > 0 so it is a data chunk... */
-		loff_t endpos;
-		loff_t chunk_base = (tags.chunk_id - 1) *
-					dev->data_bytes_per_chunk;
-
-		*found_chunks = 1;
-
-		yaffs_set_chunk_bit(dev, blk, chunk_in_block);
-		bi->pages_in_use++;
-
-		in = yaffs_find_or_create_by_number(dev,
-					tags.obj_id,
-					YAFFS_OBJECT_TYPE_FILE);
-		if (!in)
-			/* Out of memory */
-			alloc_failed = 1;
-
-		if (in &&
-		    in->variant_type == YAFFS_OBJECT_TYPE_FILE &&
-		    chunk_base < in->variant.file_variant.shrink_size) {
-			/* This has not been invalidated by
-			 * a resize */
-			if (!yaffs_put_chunk_in_file(in, tags.chunk_id,
-								chunk, -1))
-				alloc_failed = 1;
-
-			/* File size is calculated by looking at
-			 * the data chunks if we have not
-			 * seen an object header yet.
-			 * Stop this practice once we find an
-			 * object header.
-			 */
-			endpos = chunk_base + tags.n_bytes;
-
-			if (!in->valid &&
-			    in->variant.file_variant.scanned_size < endpos) {
-				in->variant.file_variant.
-				    scanned_size = endpos;
-				in->variant.file_variant.
-				    file_size = endpos;
-			}
-		} else if (in) {
-			/* This chunk has been invalidated by a
-			 * resize, or a past file deletion
-			 * so delete the chunk*/
-			yaffs_chunk_del(dev, chunk, 1, __LINE__);
-		}
-	} else {
-		/* chunk_id == 0, so it is an ObjectHeader.
-		 * Thus, we read in the object header and make
-		 * the object
-		 */
-		*found_chunks = 1;
-
-		yaffs_set_chunk_bit(dev, blk, chunk_in_block);
-		bi->pages_in_use++;
-
-		oh = NULL;
-		in = NULL;
-
-		if (tags.extra_available) {
-			in = yaffs_find_or_create_by_number(dev,
-					tags.obj_id,
-					tags.extra_obj_type);
-			if (!in)
-				alloc_failed = 1;
-		}
-
-		if (!in ||
-		    (!in->valid && dev->param.disable_lazy_load) ||
-		    tags.extra_shadows ||
-		    (!in->valid && (tags.obj_id == YAFFS_OBJECTID_ROOT ||
-				 tags.obj_id == YAFFS_OBJECTID_LOSTNFOUND))) {
-
-			/* If we don't have  valid info then we
-			 * need to read the chunk
-			 * TODO In future we can probably defer
-			 * reading the chunk and living with
-			 * invalid data until needed.
-			 */
-
-			result = yaffs_rd_chunk_tags_nand(dev,
-						  chunk,
-						  chunk_data,
-						  NULL);
-
-			oh = (struct yaffs_obj_hdr *)chunk_data;
-
-			if (dev->param.inband_tags) {
-				/* Fix up the header if they got
-				 * corrupted by inband tags */
-				oh->shadows_obj =
-				    oh->inband_shadowed_obj_id;
-				oh->is_shrink =
-				    oh->inband_is_shrink;
-			}
-
-			if (!in) {
-				in = yaffs_find_or_create_by_number(dev,
-							tags.obj_id, oh->type);
-				if (!in)
-					alloc_failed = 1;
-			}
-		}
-
-		if (!in) {
-			/* TODO Hoosterman we have a problem! */
-			yaffs_trace(YAFFS_TRACE_ERROR,
-				"yaffs tragedy: Could not make object for object  %d at chunk %d during scan",
-				tags.obj_id, chunk);
-			return YAFFS_FAIL;
-		}
-
-		if (in->valid) {
-			/* We have already filled this one.
-			 * We have a duplicate that will be
-			 * discarded, but we first have to suck
-			 * out resize info if it is a file.
-			 */
-			if ((in->variant_type == YAFFS_OBJECT_TYPE_FILE) &&
-				((oh && oh->type == YAFFS_OBJECT_TYPE_FILE) ||
-				 (tags.extra_available &&
-				  tags.extra_obj_type == YAFFS_OBJECT_TYPE_FILE)
-				)) {
-				loff_t this_size = (oh) ?
-					yaffs_oh_to_size(oh) :
-					tags.extra_file_size;
-				u32 parent_obj_id = (oh) ?
-					oh->parent_obj_id :
-					tags.extra_parent_id;
-
-				is_shrink = (oh) ?
-					oh->is_shrink :
-					tags.extra_is_shrink;
-
-				/* If it is deleted (unlinked
-				 * at start also means deleted)
-				 * we treat the file size as
-				 * being zeroed at this point.
-				 */
-				if (parent_obj_id == YAFFS_OBJECTID_DELETED ||
-				    parent_obj_id == YAFFS_OBJECTID_UNLINKED) {
-					this_size = 0;
-					is_shrink = 1;
-				}
-
-				if (is_shrink &&
-				    in->variant.file_variant.shrink_size >
-				    this_size)
-					in->variant.file_variant.shrink_size =
-					this_size;
-
-				if (is_shrink)
-					bi->has_shrink_hdr = 1;
-			}
-			/* Use existing - destroy this one. */
-			yaffs_chunk_del(dev, chunk, 1, __LINE__);
-		}
-
-		if (!in->valid && in->variant_type !=
-		    (oh ? oh->type : tags.extra_obj_type)) {
-			yaffs_trace(YAFFS_TRACE_ERROR,
-				"yaffs tragedy: Bad type, %d != %d, for object %d at chunk %d during scan",
-				oh ? oh->type : tags.extra_obj_type,
-				in->variant_type, tags.obj_id,
-				chunk);
-			in = yaffs_retype_obj(in, oh ? oh->type : tags.extra_obj_type);
-		}
-
-		if (!in->valid &&
-		    (tags.obj_id == YAFFS_OBJECTID_ROOT ||
-		     tags.obj_id == YAFFS_OBJECTID_LOSTNFOUND)) {
-			/* We only load some info, don't fiddle
-			 * with directory structure */
-			in->valid = 1;
-
-			if (oh) {
-				in->yst_mode = oh->yst_mode;
-				yaffs_load_attribs(in, oh);
-				in->lazy_loaded = 0;
-			} else {
-				in->lazy_loaded = 1;
-			}
-			in->hdr_chunk = chunk;
-
-		} else if (!in->valid) {
-			/* we need to load this info */
-			in->valid = 1;
-			in->hdr_chunk = chunk;
-			if (oh) {
-				in->variant_type = oh->type;
-				in->yst_mode = oh->yst_mode;
-				yaffs_load_attribs(in, oh);
-
-				if (oh->shadows_obj > 0)
-					yaffs_handle_shadowed_obj(dev,
-					     oh->shadows_obj, 1);
-
-				yaffs_set_obj_name_from_oh(in, oh);
-				parent = yaffs_find_or_create_by_number(dev,
-						oh->parent_obj_id,
-						YAFFS_OBJECT_TYPE_DIRECTORY);
-				file_size = yaffs_oh_to_size(oh);
-				is_shrink = oh->is_shrink;
-				equiv_id = oh->equiv_id;
-			} else {
-				in->variant_type = tags.extra_obj_type;
-				parent = yaffs_find_or_create_by_number(dev,
-						tags.extra_parent_id,
-						YAFFS_OBJECT_TYPE_DIRECTORY);
-				file_size = tags.extra_file_size;
-				is_shrink = tags.extra_is_shrink;
-				equiv_id = tags.extra_equiv_id;
-				in->lazy_loaded = 1;
-			}
-			in->dirty = 0;
-
-			if (!parent)
-				alloc_failed = 1;
-
-			/* directory stuff...
-			 * hook up to parent
-			 */
-
-			if (parent &&
-			    parent->variant_type == YAFFS_OBJECT_TYPE_UNKNOWN) {
-				/* Set up as a directory */
-				parent->variant_type =
-					YAFFS_OBJECT_TYPE_DIRECTORY;
-				INIT_LIST_HEAD(&parent->
-						variant.dir_variant.children);
-			} else if (!parent ||
-				   parent->variant_type !=
-					YAFFS_OBJECT_TYPE_DIRECTORY) {
-				/* Hoosterman, another problem....
-				 * Trying to use a non-directory as a directory
-				 */
-
-				yaffs_trace(YAFFS_TRACE_ERROR,
-					"yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
-					);
-				parent = dev->lost_n_found;
-			}
-			yaffs_add_obj_to_dir(parent, in);
-
-			is_unlinked = (parent == dev->del_dir) ||
-					(parent == dev->unlinked_dir);
-
-			if (is_shrink)
-				/* Mark the block */
-				bi->has_shrink_hdr = 1;
-
-			/* Note re hardlinks.
-			 * Since we might scan a hardlink before its equivalent
-			 * object is scanned we put them all in a list.
-			 * After scanning is complete, we should have all the
-			 * objects, so we run through this list and fix up all
-			 * the chains.
-			 */
-
-			switch (in->variant_type) {
-			case YAFFS_OBJECT_TYPE_UNKNOWN:
-				/* Todo got a problem */
-				break;
-			case YAFFS_OBJECT_TYPE_FILE:
-				file_var = &in->variant.file_variant;
-				if (file_var->scanned_size < file_size) {
-					/* This covers the case where the file
-					 * size is greater than the data held.
-					 * This will happen if the file is
-					 * resized to be larger than its
-					 * current data extents.
-					 */
-					file_var->file_size = file_size;
-					file_var->scanned_size = file_size;
-				}
-
-				if (file_var->shrink_size > file_size)
-					file_var->shrink_size = file_size;
-
-				break;
-			case YAFFS_OBJECT_TYPE_HARDLINK:
-				hl_var = &in->variant.hardlink_variant;
-				if (!is_unlinked) {
-					hl_var->equiv_id = equiv_id;
-					list_add(&in->hard_links, hard_list);
-				}
-				break;
-			case YAFFS_OBJECT_TYPE_DIRECTORY:
-				/* Do nothing */
-				break;
-			case YAFFS_OBJECT_TYPE_SPECIAL:
-				/* Do nothing */
-				break;
-			case YAFFS_OBJECT_TYPE_SYMLINK:
-				sl_var = &in->variant.symlink_variant;
-				if (oh) {
-					sl_var->alias =
-					    yaffs_clone_str(oh->alias);
-					if (!sl_var->alias)
-						alloc_failed = 1;
-				}
-				break;
-			}
-		}
-	}
-	return alloc_failed ? YAFFS_FAIL : YAFFS_OK;
-}
-
-int yaffs2_scan_backwards(struct yaffs_dev *dev)
-{
-	int blk;
-	int block_iter;
-	int start_iter;
-	int end_iter;
-	int n_to_scan = 0;
-	enum yaffs_block_state state;
-	int c;
-	LIST_HEAD(hard_list);
-	struct yaffs_block_info *bi;
-	u32 seq_number;
-	int n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
-	u8 *chunk_data;
-	int found_chunks;
-	int alloc_failed = 0;
-	struct yaffs_block_index *block_index = NULL;
-	int alt_block_index = 0;
-	int summary_available;
-
-	yaffs_trace(YAFFS_TRACE_SCAN,
-		"yaffs2_scan_backwards starts  intstartblk %d intendblk %d...",
-		dev->internal_start_block, dev->internal_end_block);
-
-	dev->seq_number = YAFFS_LOWEST_SEQUENCE_NUMBER;
-
-	block_index =
-		kmalloc(n_blocks * sizeof(struct yaffs_block_index), GFP_NOFS);
-
-	if (!block_index) {
-		block_index =
-		    vmalloc(n_blocks * sizeof(struct yaffs_block_index));
-		alt_block_index = 1;
-	}
-
-	if (!block_index) {
-		yaffs_trace(YAFFS_TRACE_SCAN,
-			"yaffs2_scan_backwards() could not allocate block index!"
-			);
-		return YAFFS_FAIL;
-	}
-
-	dev->blocks_in_checkpt = 0;
-
-	chunk_data = yaffs_get_temp_buffer(dev);
-
-	/* Scan all the blocks to determine their state */
-	bi = dev->block_info;
-	for (blk = dev->internal_start_block; blk <= dev->internal_end_block;
-	     blk++) {
-		yaffs_clear_chunk_bits(dev, blk);
-		bi->pages_in_use = 0;
-		bi->soft_del_pages = 0;
-
-		yaffs_query_init_block_state(dev, blk, &state, &seq_number);
-
-		bi->block_state = state;
-		bi->seq_number = seq_number;
-
-		if (bi->seq_number == YAFFS_SEQUENCE_CHECKPOINT_DATA)
-			bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT;
-		if (bi->seq_number == YAFFS_SEQUENCE_BAD_BLOCK)
-			bi->block_state = YAFFS_BLOCK_STATE_DEAD;
-
-		yaffs_trace(YAFFS_TRACE_SCAN_DEBUG,
-			"Block scanning block %d state %d seq %d",
-			blk, bi->block_state, seq_number);
-
-		if (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT) {
-			dev->blocks_in_checkpt++;
-
-		} else if (bi->block_state == YAFFS_BLOCK_STATE_DEAD) {
-			yaffs_trace(YAFFS_TRACE_BAD_BLOCKS,
-				"block %d is bad", blk);
-		} else if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
-			yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, "Block empty ");
-			dev->n_erased_blocks++;
-			dev->n_free_chunks += dev->param.chunks_per_block;
-		} else if (bi->block_state ==
-				YAFFS_BLOCK_STATE_NEEDS_SCAN) {
-			/* Determine the highest sequence number */
-			if (seq_number >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
-			    seq_number < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
-				block_index[n_to_scan].seq = seq_number;
-				block_index[n_to_scan].block = blk;
-				n_to_scan++;
-				if (seq_number >= dev->seq_number)
-					dev->seq_number = seq_number;
-			} else {
-				/* TODO: Nasty sequence number! */
-				yaffs_trace(YAFFS_TRACE_SCAN,
-					"Block scanning block %d has bad sequence number %d",
-					blk, seq_number);
-			}
-		}
-		bi++;
-	}
-
-	yaffs_trace(YAFFS_TRACE_ALWAYS, "%d blocks to be sorted...", n_to_scan);
-
-	cond_resched();
-
-	/* Sort the blocks by sequence number */
-	sort(block_index, n_to_scan, sizeof(struct yaffs_block_index),
-		   yaffs2_ybicmp, NULL);
-
-	cond_resched();
-
-	yaffs_trace(YAFFS_TRACE_SCAN, "...done");
-
-	/* Now scan the blocks looking at the data. */
-	start_iter = 0;
-	end_iter = n_to_scan - 1;
-	yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, "%d blocks to scan", n_to_scan);
-
-	/* For each block.... backwards */
-	for (block_iter = end_iter;
-	     !alloc_failed && block_iter >= start_iter;
-	     block_iter--) {
-		/* Cooperative multitasking! This loop can run for so
-		   long that watchdog timers expire. */
-		cond_resched();
-
-		/* get the block to scan in the correct order */
-		blk = block_index[block_iter].block;
-		bi = yaffs_get_block_info(dev, blk);
-
-		summary_available = yaffs_summary_read(dev, dev->sum_tags, blk);
-
-		/* For each chunk in each block that needs scanning.... */
-		found_chunks = 0;
-		if (summary_available)
-			c = dev->chunks_per_summary - 1;
-		else
-			c = dev->param.chunks_per_block - 1;
-
-		for (/* c is already initialised */;
-		     !alloc_failed && c >= 0 &&
-		     (bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN ||
-		      bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING);
-		      c--) {
-			/* Scan backwards...
-			 * Read the tags and decide what to do
-			 */
-			if (yaffs2_scan_chunk(dev, bi, blk, c,
-					&found_chunks, chunk_data,
-					&hard_list, summary_available) ==
-					YAFFS_FAIL)
-				alloc_failed = 1;
-		}
-
-		if (bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN) {
-			/* If we got this far while scanning, then the block
-			 * is fully allocated. */
-			bi->block_state = YAFFS_BLOCK_STATE_FULL;
-		}
-
-		/* Now let's see if it was dirty */
-		if (bi->pages_in_use == 0 &&
-		    !bi->has_shrink_hdr &&
-		    bi->block_state == YAFFS_BLOCK_STATE_FULL) {
-			yaffs_block_became_dirty(dev, blk);
-		}
-	}
-
-	yaffs_skip_rest_of_block(dev);
-
-	if (alt_block_index)
-		vfree(block_index);
-	else
-		kfree(block_index);
-
-	/* Ok, we've done all the scanning.
-	 * Fix up the hard link chains.
-	 * We have scanned all the objects, now it's time to add these
-	 * hardlinks.
-	 */
-	yaffs_link_fixup(dev, &hard_list);
-
-	yaffs_release_temp_buffer(dev, chunk_data);
-
-	if (alloc_failed)
-		return YAFFS_FAIL;
-
-	yaffs_trace(YAFFS_TRACE_SCAN, "yaffs2_scan_backwards ends");
-
-	return YAFFS_OK;
-}

target/linux/generic/files/fs/yaffs2/yaffs_yaffs2.h

@@ -1,39 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License version 2.1 as
- * published by the Free Software Foundation.
- *
- * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
- */
-
-#ifndef __YAFFS_YAFFS2_H__
-#define __YAFFS_YAFFS2_H__
-
-#include "yaffs_guts.h"
-
-void yaffs_calc_oldest_dirty_seq(struct yaffs_dev *dev);
-void yaffs2_find_oldest_dirty_seq(struct yaffs_dev *dev);
-void yaffs2_clear_oldest_dirty_seq(struct yaffs_dev *dev,
-				   struct yaffs_block_info *bi);
-void yaffs2_update_oldest_dirty_seq(struct yaffs_dev *dev, unsigned block_no,
-				    struct yaffs_block_info *bi);
-int yaffs_block_ok_for_gc(struct yaffs_dev *dev, struct yaffs_block_info *bi);
-u32 yaffs2_find_refresh_block(struct yaffs_dev *dev);
-int yaffs2_checkpt_required(struct yaffs_dev *dev);
-int yaffs_calc_checkpt_blocks_required(struct yaffs_dev *dev);
-
-void yaffs2_checkpt_invalidate(struct yaffs_dev *dev);
-int yaffs2_checkpt_save(struct yaffs_dev *dev);
-int yaffs2_checkpt_restore(struct yaffs_dev *dev);
-
-int yaffs2_handle_hole(struct yaffs_obj *obj, loff_t new_size);
-int yaffs2_scan_backwards(struct yaffs_dev *dev);
-
-#endif

target/linux/generic/files/fs/yaffs2/yportenv.h

@@ -1,85 +0,0 @@
-/*
- * 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 <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License version 2.1 as
- * published by the Free Software Foundation.
- *
- * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
- */
-
-#ifndef __YPORTENV_H__
-#define __YPORTENV_H__
-
-/*
- * Define the MTD version in terms of Linux Kernel versions
- * This allows yaffs to be used independantly of the kernel
- * as well as with it.
- */
-
-#define MTD_VERSION(a, b, c) (((a) << 16) + ((b) << 8) + (c))
-
-#ifdef YAFFS_OUT_OF_TREE
-#include "moduleconfig.h"
-#endif
-
-#include <linux/version.h>
-#define MTD_VERSION_CODE LINUX_VERSION_CODE
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
-#include <linux/config.h>
-#endif
-#include <linux/version.h>
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/sched.h>
-#include <linux/string.h>
-#include <linux/slab.h>
-#include <linux/vmalloc.h>
-#include <linux/xattr.h>
-#include <linux/list.h>
-#include <linux/types.h>
-#include <linux/fs.h>
-#include <linux/stat.h>
-#include <linux/sort.h>
-#include <linux/bitops.h>
-
-/*  These type wrappings are used to support Unicode names in WinCE. */
-#define YCHAR char
-#define YUCHAR unsigned char
-#define _Y(x)     x
-
-#define YAFFS_LOSTNFOUND_NAME		"lost+found"
-#define YAFFS_LOSTNFOUND_PREFIX		"obj"
-
-
-#define YAFFS_ROOT_MODE			0755
-#define YAFFS_LOSTNFOUND_MODE		0700
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-#define Y_CURRENT_TIME CURRENT_TIME.tv_sec
-#define Y_TIME_CONVERT(x) (x).tv_sec
-#else
-#define Y_CURRENT_TIME CURRENT_TIME
-#define Y_TIME_CONVERT(x) (x)
-#endif
-
-#define compile_time_assertion(assertion) \
-	({ int x = __builtin_choose_expr(assertion, 0, (void)0); (void) x; })
-
-
-#define yaffs_printf(msk, fmt, ...) \
-	printk(KERN_DEBUG "yaffs: " fmt "\n", ##__VA_ARGS__)
-
-#define yaffs_trace(msk, fmt, ...) do { \
-	if (yaffs_trace_mask & (msk)) \
-		printk(KERN_DEBUG "yaffs: " fmt "\n", ##__VA_ARGS__); \
-} while (0)
-
-
-#endif

target/linux/generic/patches-3.18/500-yaffs-Kbuild-integration.patch

@@ -1,18 +0,0 @@
---- a/fs/Kconfig
-+++ b/fs/Kconfig
-@@ -39,6 +39,7 @@ source "fs/gfs2/Kconfig"
- source "fs/ocfs2/Kconfig"
- source "fs/btrfs/Kconfig"
- source "fs/nilfs2/Kconfig"
-+source "fs/yaffs2/Kconfig"
- 
- endif # BLOCK
- 
---- a/fs/Makefile
-+++ b/fs/Makefile
-@@ -126,3 +126,5 @@ obj-y				+= exofs/ # Multiple modules
- obj-$(CONFIG_CEPH_FS)		+= ceph/
- obj-$(CONFIG_PSTORE)		+= pstore/
- obj-$(CONFIG_EFIVAR_FS)		+= efivarfs/
-+obj-$(CONFIG_YAFFS_FS)		+= yaffs2/
-+

target/linux/generic/patches-3.18/502-yaffs-fix-compat-tags-handling.patch

@@ -1,239 +0,0 @@
-Subject: yaffs: fix compat tags handling
-
-Signed-off-by: Gabor Juhos <[email protected]>
----
---- a/fs/yaffs2/yaffs_tagscompat.c
-+++ b/fs/yaffs2/yaffs_tagscompat.c
-@@ -17,7 +17,9 @@
- #include "yaffs_getblockinfo.h"
- #include "yaffs_trace.h"
- 
-+#if 0
- static void yaffs_handle_rd_data_error(struct yaffs_dev *dev, int nand_chunk);
-+#endif
- 
- 
- /********** Tags ECC calculations  *********/
-@@ -71,6 +73,7 @@ int yaffs_check_tags_ecc(struct yaffs_ta
- 	return 0;
- }
- 
-+#if 0
- /********** Tags **********/
- 
- static void yaffs_load_tags_to_spare(struct yaffs_spare *spare_ptr,
-@@ -379,3 +382,214 @@ void yaffs_tags_compat_install(struct ya
- 	if(!dev->tagger.mark_bad_fn)
- 		dev->tagger.mark_bad_fn = yaffs_tags_compat_mark_bad;
- }
-+#else
-+
-+#include "yaffs_packedtags1.h"
-+
-+static int yaffs_tags_compat_write(struct yaffs_dev *dev,
-+				   int nand_chunk,
-+				   const u8 *data,
-+				   const struct yaffs_ext_tags *tags)
-+{
-+	struct yaffs_packed_tags1 pt1;
-+	u8 tag_buf[9];
-+	int retval;
-+
-+	/* we assume that yaffs_packed_tags1 and yaffs_tags are compatible */
-+	compile_time_assertion(sizeof(struct yaffs_packed_tags1) == 12);
-+	compile_time_assertion(sizeof(struct yaffs_tags) == 8);
-+
-+	yaffs_pack_tags1(&pt1, tags);
-+	yaffs_calc_tags_ecc((struct yaffs_tags *)&pt1);
-+
-+	/* When deleting a chunk, the upper layer provides only skeletal
-+	 * tags, one with is_deleted set.  However, we need to update the
-+	 * tags, not erase them completely.  So we use the NAND write property
-+	 * that only zeroed-bits stick and set tag bytes to all-ones and
-+	 * zero just the (not) deleted bit.
-+	 */
-+	if (!dev->param.tags_9bytes) {
-+		if (tags->is_deleted) {
-+			memset(&pt1, 0xff, 8);
-+			/* clear delete status bit to indicate deleted */
-+			pt1.deleted = 0;
-+		}
-+		memcpy(tag_buf, &pt1, 8);
-+	} else {
-+		if (tags->is_deleted) {
-+			memset(tag_buf, 0xff, 8);
-+			tag_buf[8] = 0;
-+		} else {
-+			memcpy(tag_buf, &pt1, 8);
-+			tag_buf[8] = 0xff;
-+		}
-+	}
-+
-+	retval = dev->drv.drv_write_chunk_fn(dev, nand_chunk,
-+			data,
-+			(data) ? dev->data_bytes_per_chunk : 0,
-+			tag_buf,
-+			(dev->param.tags_9bytes) ? 9 : 8);
-+
-+	return retval;
-+}
-+
-+/* Return with empty extended tags but add ecc_result.
-+ */
-+static int return_empty_tags(struct yaffs_ext_tags *tags,
-+			     enum yaffs_ecc_result ecc_result,
-+			     int retval)
-+{
-+	if (tags) {
-+		memset(tags, 0, sizeof(*tags));
-+		tags->ecc_result = ecc_result;
-+	}
-+
-+	return retval;
-+}
-+
-+static int yaffs_tags_compat_read(struct yaffs_dev *dev,
-+				  int nand_chunk,
-+				  u8 *data,
-+				  struct yaffs_ext_tags *tags)
-+{
-+	struct yaffs_packed_tags1 pt1;
-+	enum yaffs_ecc_result ecc_result;
-+	int retval;
-+	int deleted;
-+	u8 tag_buf[9];
-+
-+	retval = dev->drv.drv_read_chunk_fn(dev, nand_chunk,
-+			data, dev->param.total_bytes_per_chunk,
-+			tag_buf,
-+			(dev->param.tags_9bytes) ? 9 : 8,
-+			&ecc_result);
-+
-+	switch (ecc_result) {
-+	case YAFFS_ECC_RESULT_NO_ERROR:
-+	case YAFFS_ECC_RESULT_FIXED:
-+		break;
-+
-+	case YAFFS_ECC_RESULT_UNFIXED:
-+	default:
-+		return_empty_tags(tags, YAFFS_ECC_RESULT_UNFIXED, 0);
-+		tags->block_bad = dev->drv.drv_check_bad_fn(dev, nand_chunk);
-+		return YAFFS_FAIL;
-+	}
-+
-+	/* Check for a blank/erased chunk. */
-+	if (yaffs_check_ff(tag_buf, 8)) {
-+		/* when blank, upper layers want ecc_result to be <= NO_ERROR */
-+		return return_empty_tags(tags, YAFFS_ECC_RESULT_NO_ERROR,
-+					 YAFFS_OK);
-+	}
-+
-+	memcpy(&pt1, tag_buf, 8);
-+
-+	if (!dev->param.tags_9bytes) {
-+		/* Read deleted status (bit) then return it to it's non-deleted
-+		 * state before performing tags mini-ECC check. pt1.deleted is
-+		 * inverted.
-+		 */
-+		deleted = !pt1.deleted;
-+		pt1.deleted = 1;
-+	} else {
-+		deleted = (hweight8(tag_buf[8]) < 7) ? 1 : 0;
-+	}
-+
-+	/* Check the packed tags mini-ECC and correct if necessary/possible. */
-+	retval = yaffs_check_tags_ecc((struct yaffs_tags *)&pt1);
-+	switch (retval) {
-+	case 0:
-+		/* no tags error, use MTD result */
-+		break;
-+	case 1:
-+		/* recovered tags-ECC error */
-+		dev->n_tags_ecc_fixed++;
-+		if (ecc_result == YAFFS_ECC_RESULT_NO_ERROR)
-+			ecc_result = YAFFS_ECC_RESULT_FIXED;
-+		break;
-+	default:
-+		/* unrecovered tags-ECC error */
-+		dev->n_tags_ecc_unfixed++;
-+		return return_empty_tags(tags, YAFFS_ECC_RESULT_UNFIXED,
-+					 YAFFS_FAIL);
-+	}
-+
-+	/* Unpack the tags to extended form and set ECC result.
-+	 * [set should_be_ff just to keep yaffs_unpack_tags1 happy]
-+	 */
-+	pt1.should_be_ff = 0xffffffff;
-+	yaffs_unpack_tags1(tags, &pt1);
-+	tags->ecc_result = ecc_result;
-+
-+	/* Set deleted state */
-+	tags->is_deleted = deleted;
-+	return YAFFS_OK;
-+}
-+
-+static int yaffs_tags_compat_mark_bad(struct yaffs_dev *dev, int block_no)
-+{
-+	return dev->drv.drv_mark_bad_fn(dev, block_no);
-+}
-+
-+static int yaffs_tags_compat_query_block(struct yaffs_dev *dev,
-+					 int block_no,
-+					 enum yaffs_block_state *state,
-+					 u32 *seq_number)
-+{
-+	struct yaffs_ext_tags tags;
-+	int retval;
-+
-+	yaffs_trace(YAFFS_TRACE_MTD, "%s %d", __func__, block_no);
-+
-+	*seq_number = 0;
-+
-+	retval = dev->drv.drv_check_bad_fn(dev, block_no);
-+	if (retval == YAFFS_FAIL) {
-+		*state = YAFFS_BLOCK_STATE_DEAD;
-+		goto out;
-+	}
-+
-+	yaffs_tags_compat_read(dev, block_no * dev->param.chunks_per_block,
-+			       NULL, &tags);
-+
-+	if (tags.ecc_result != YAFFS_ECC_RESULT_NO_ERROR) {
-+		yaffs_trace(YAFFS_TRACE_MTD, "block %d is marked bad",
-+			    block_no);
-+		*state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
-+	} else if (tags.chunk_used) {
-+		*seq_number = tags.seq_number;
-+		*state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
-+	} else {
-+		*state = YAFFS_BLOCK_STATE_EMPTY;
-+	}
-+
-+	retval = YAFFS_OK;
-+
-+out:
-+	yaffs_trace(YAFFS_TRACE_MTD,
-+		    "block query returns seq %u state %d",
-+		    *seq_number, *state);
-+
-+	return retval;
-+}
-+
-+void yaffs_tags_compat_install(struct yaffs_dev *dev)
-+{
-+	if (dev->param.is_yaffs2)
-+		return;
-+
-+	if (!dev->tagger.write_chunk_tags_fn)
-+		dev->tagger.write_chunk_tags_fn = yaffs_tags_compat_write;
-+
-+	if (!dev->tagger.read_chunk_tags_fn)
-+		dev->tagger.read_chunk_tags_fn = yaffs_tags_compat_read;
-+
-+	if (!dev->tagger.query_block_fn)
-+		dev->tagger.query_block_fn = yaffs_tags_compat_query_block;
-+
-+	if (!dev->tagger.mark_bad_fn)
-+		dev->tagger.mark_bad_fn = yaffs_tags_compat_mark_bad;
-+}
-+#endif

target/linux/generic/patches-3.18/503-yaffs-add-tags-9bytes-mount-option.patch

@@ -1,115 +0,0 @@
-Subject: yaffs: add support for tags-9bytes mount option
-
-Signed-off-by: Gabor Juhos <[email protected]>
----
---- a/fs/yaffs2/yaffs_vfs.c
-+++ b/fs/yaffs2/yaffs_vfs.c
-@@ -2644,6 +2644,7 @@ static const struct super_operations yaf
- 
- struct yaffs_options {
- 	int inband_tags;
-+	int tags_9bytes;
- 	int skip_checkpoint_read;
- 	int skip_checkpoint_write;
- 	int no_cache;
-@@ -2683,6 +2684,8 @@ static int yaffs_parse_options(struct ya
- 
- 		if (!strcmp(cur_opt, "inband-tags")) {
- 			options->inband_tags = 1;
-+		} else if (!strcmp(cur_opt, "tags-9bytes")) {
-+			options->tags_9bytes = 1;
- 		} else if (!strcmp(cur_opt, "tags-ecc-off")) {
- 			options->tags_ecc_on = 0;
- 			options->tags_ecc_overridden = 1;
-@@ -2756,7 +2759,6 @@ static struct super_block *yaffs_interna
- 	struct yaffs_param *param;
- 
- 	int read_only = 0;
--	int inband_tags = 0;
- 
- 	struct yaffs_options options;
- 
-@@ -2796,6 +2798,9 @@ static struct super_block *yaffs_interna
- 
- 	memset(&options, 0, sizeof(options));
- 
-+	if (IS_ENABLED(CONFIG_YAFFS_9BYTE_TAGS))
-+		options.tags_9bytes = 1;
-+
- 	if (yaffs_parse_options(&options, data_str)) {
- 		/* Option parsing failed */
- 		return NULL;
-@@ -2829,17 +2834,22 @@ static struct super_block *yaffs_interna
- 	}
- 
- 	/* Added NCB 26/5/2006 for completeness */
--	if (yaffs_version == 2 && !options.inband_tags
--	    && WRITE_SIZE(mtd) == 512) {
-+	if (yaffs_version == 2 &&
-+	    (!options.inband_tags || options.tags_9bytes) &&
-+	    WRITE_SIZE(mtd) == 512) {
- 		yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs1");
- 		yaffs_version = 1;
- 	}
- 
--	if (mtd->oobavail < sizeof(struct yaffs_packed_tags2) ||
--	    options.inband_tags)
--		inband_tags = 1;
-+	if (yaffs_version == 2 &&
-+	    mtd->oobavail < sizeof(struct yaffs_packed_tags2)) {
-+		yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting inband tags");
-+		options.inband_tags = 1;
-+	}
- 
--	if(yaffs_verify_mtd(mtd, yaffs_version, inband_tags) < 0)
-+	err = yaffs_verify_mtd(mtd, yaffs_version, options.inband_tags,
-+			       options.tags_9bytes);
-+	if (err < 0)
- 		return NULL;
- 
- 	/* OK, so if we got here, we have an MTD that's NAND and looks
-@@ -2896,7 +2906,8 @@ static struct super_block *yaffs_interna
- 
- 	param->n_reserved_blocks = 5;
- 	param->n_caches = (options.no_cache) ? 0 : 10;
--	param->inband_tags = inband_tags;
-+	param->inband_tags = options.inband_tags;
-+	param->tags_9bytes = options.tags_9bytes;
- 
- 	param->enable_xattr = 1;
- 	if (options.lazy_loading_overridden)
---- a/fs/yaffs2/yaffs_mtdif.c
-+++ b/fs/yaffs2/yaffs_mtdif.c
-@@ -278,7 +278,8 @@ struct mtd_info * yaffs_get_mtd_device(d
- 	return mtd;
- }
- 
--int yaffs_verify_mtd(struct mtd_info *mtd, int yaffs_version, int inband_tags)
-+int yaffs_verify_mtd(struct mtd_info *mtd, int yaffs_version, int inband_tags,
-+		     int tags_9bytes)
- {
- 	if (yaffs_version == 2) {
- 		if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
-@@ -297,6 +298,12 @@ int yaffs_verify_mtd(struct mtd_info *mt
- 			);
- 			return -1;
- 		}
-+
-+		if (tags_9bytes && mtd->oobavail < 9) {
-+			yaffs_trace(YAFFS_TRACE_ALWAYS,
-+				    "MTD device does not support 9-byte tags");
-+			return -1;
-+		}
- 	}
- 
- 	return 0;
---- a/fs/yaffs2/yaffs_mtdif.h
-+++ b/fs/yaffs2/yaffs_mtdif.h
-@@ -21,5 +21,6 @@
- void yaffs_mtd_drv_install(struct yaffs_dev *dev);
- struct mtd_info * yaffs_get_mtd_device(dev_t sdev);
- void yaffs_put_mtd_device(struct mtd_info *mtd);
--int yaffs_verify_mtd(struct mtd_info *mtd, int yaffs_version, int inband_tags);
-+int yaffs_verify_mtd(struct mtd_info *mtd, int yaffs_version, int inband_tags,
-+		     int tags_9bytes);
- #endif

target/linux/generic/patches-3.18/504-yaffs-3.16-new-fops.patch

@@ -1,25 +0,0 @@
---- a/fs/yaffs2/yaffs_vfs.c
-+++ b/fs/yaffs2/yaffs_vfs.c
-@@ -774,7 +774,21 @@ static int yaffs_sync_object(struct file
- }
- 
- 
--#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 22))
-+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 16, 0))
-+static const struct file_operations yaffs_file_operations = {
-+	.read = new_sync_read,
-+	.read_iter = generic_file_read_iter,
-+	.write = new_sync_write,
-+	.write_iter = generic_file_write_iter,
-+	.mmap = generic_file_mmap,
-+	.flush = yaffs_file_flush,
-+	.fsync = yaffs_sync_object,
-+	.splice_read = generic_file_splice_read,
-+	.splice_write = iter_file_splice_write,
-+	.llseek = generic_file_llseek,
-+};
-+
-+#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 22))
- static const struct file_operations yaffs_file_operations = {
- 	.read = do_sync_read,
- 	.write = do_sync_write,

target/linux/generic/patches-3.18/903-debloat_direct_io.patch

@@ -1,6 +1,6 @@
 --- a/fs/Kconfig
 +++ b/fs/Kconfig
-@@ -62,6 +62,11 @@ config FILE_LOCKING
+@@ -61,6 +61,11 @@ config FILE_LOCKING
            for filesystems like NFS and for the flock() system
            call. Disabling this option saves about 11k.
  

target/linux/generic/patches-4.4/500-yaffs-Kbuild-integration.patch

@@ -1,18 +0,0 @@
---- a/fs/Kconfig
-+++ b/fs/Kconfig
-@@ -30,6 +30,7 @@ source "fs/ocfs2/Kconfig"
- source "fs/btrfs/Kconfig"
- source "fs/nilfs2/Kconfig"
- source "fs/f2fs/Kconfig"
-+source "fs/yaffs2/Kconfig"
- 
- config FS_DAX
- 	bool "Direct Access (DAX) support"
---- a/fs/Makefile
-+++ b/fs/Makefile
-@@ -126,3 +126,5 @@ obj-y				+= exofs/ # Multiple modules
- obj-$(CONFIG_CEPH_FS)		+= ceph/
- obj-$(CONFIG_PSTORE)		+= pstore/
- obj-$(CONFIG_EFIVAR_FS)		+= efivarfs/
-+obj-$(CONFIG_YAFFS_FS)		+= yaffs2/
-+

target/linux/generic/patches-4.4/502-yaffs-fix-compat-tags-handling.patch

@@ -1,239 +0,0 @@
-Subject: yaffs: fix compat tags handling
-
-Signed-off-by: Gabor Juhos <[email protected]>
----
---- a/fs/yaffs2/yaffs_tagscompat.c
-+++ b/fs/yaffs2/yaffs_tagscompat.c
-@@ -17,7 +17,9 @@
- #include "yaffs_getblockinfo.h"
- #include "yaffs_trace.h"
- 
-+#if 0
- static void yaffs_handle_rd_data_error(struct yaffs_dev *dev, int nand_chunk);
-+#endif
- 
- 
- /********** Tags ECC calculations  *********/
-@@ -71,6 +73,7 @@ int yaffs_check_tags_ecc(struct yaffs_ta
- 	return 0;
- }
- 
-+#if 0
- /********** Tags **********/
- 
- static void yaffs_load_tags_to_spare(struct yaffs_spare *spare_ptr,
-@@ -379,3 +382,214 @@ void yaffs_tags_compat_install(struct ya
- 	if(!dev->tagger.mark_bad_fn)
- 		dev->tagger.mark_bad_fn = yaffs_tags_compat_mark_bad;
- }
-+#else
-+
-+#include "yaffs_packedtags1.h"
-+
-+static int yaffs_tags_compat_write(struct yaffs_dev *dev,
-+				   int nand_chunk,
-+				   const u8 *data,
-+				   const struct yaffs_ext_tags *tags)
-+{
-+	struct yaffs_packed_tags1 pt1;
-+	u8 tag_buf[9];
-+	int retval;
-+
-+	/* we assume that yaffs_packed_tags1 and yaffs_tags are compatible */
-+	compile_time_assertion(sizeof(struct yaffs_packed_tags1) == 12);
-+	compile_time_assertion(sizeof(struct yaffs_tags) == 8);
-+
-+	yaffs_pack_tags1(&pt1, tags);
-+	yaffs_calc_tags_ecc((struct yaffs_tags *)&pt1);
-+
-+	/* When deleting a chunk, the upper layer provides only skeletal
-+	 * tags, one with is_deleted set.  However, we need to update the
-+	 * tags, not erase them completely.  So we use the NAND write property
-+	 * that only zeroed-bits stick and set tag bytes to all-ones and
-+	 * zero just the (not) deleted bit.
-+	 */
-+	if (!dev->param.tags_9bytes) {
-+		if (tags->is_deleted) {
-+			memset(&pt1, 0xff, 8);
-+			/* clear delete status bit to indicate deleted */
-+			pt1.deleted = 0;
-+		}
-+		memcpy(tag_buf, &pt1, 8);
-+	} else {
-+		if (tags->is_deleted) {
-+			memset(tag_buf, 0xff, 8);
-+			tag_buf[8] = 0;
-+		} else {
-+			memcpy(tag_buf, &pt1, 8);
-+			tag_buf[8] = 0xff;
-+		}
-+	}
-+
-+	retval = dev->drv.drv_write_chunk_fn(dev, nand_chunk,
-+			data,
-+			(data) ? dev->data_bytes_per_chunk : 0,
-+			tag_buf,
-+			(dev->param.tags_9bytes) ? 9 : 8);
-+
-+	return retval;
-+}
-+
-+/* Return with empty extended tags but add ecc_result.
-+ */
-+static int return_empty_tags(struct yaffs_ext_tags *tags,
-+			     enum yaffs_ecc_result ecc_result,
-+			     int retval)
-+{
-+	if (tags) {
-+		memset(tags, 0, sizeof(*tags));
-+		tags->ecc_result = ecc_result;
-+	}
-+
-+	return retval;
-+}
-+
-+static int yaffs_tags_compat_read(struct yaffs_dev *dev,
-+				  int nand_chunk,
-+				  u8 *data,
-+				  struct yaffs_ext_tags *tags)
-+{
-+	struct yaffs_packed_tags1 pt1;
-+	enum yaffs_ecc_result ecc_result;
-+	int retval;
-+	int deleted;
-+	u8 tag_buf[9];
-+
-+	retval = dev->drv.drv_read_chunk_fn(dev, nand_chunk,
-+			data, dev->param.total_bytes_per_chunk,
-+			tag_buf,
-+			(dev->param.tags_9bytes) ? 9 : 8,
-+			&ecc_result);
-+
-+	switch (ecc_result) {
-+	case YAFFS_ECC_RESULT_NO_ERROR:
-+	case YAFFS_ECC_RESULT_FIXED:
-+		break;
-+
-+	case YAFFS_ECC_RESULT_UNFIXED:
-+	default:
-+		return_empty_tags(tags, YAFFS_ECC_RESULT_UNFIXED, 0);
-+		tags->block_bad = dev->drv.drv_check_bad_fn(dev, nand_chunk);
-+		return YAFFS_FAIL;
-+	}
-+
-+	/* Check for a blank/erased chunk. */
-+	if (yaffs_check_ff(tag_buf, 8)) {
-+		/* when blank, upper layers want ecc_result to be <= NO_ERROR */
-+		return return_empty_tags(tags, YAFFS_ECC_RESULT_NO_ERROR,
-+					 YAFFS_OK);
-+	}
-+
-+	memcpy(&pt1, tag_buf, 8);
-+
-+	if (!dev->param.tags_9bytes) {
-+		/* Read deleted status (bit) then return it to it's non-deleted
-+		 * state before performing tags mini-ECC check. pt1.deleted is
-+		 * inverted.
-+		 */
-+		deleted = !pt1.deleted;
-+		pt1.deleted = 1;
-+	} else {
-+		deleted = (hweight8(tag_buf[8]) < 7) ? 1 : 0;
-+	}
-+
-+	/* Check the packed tags mini-ECC and correct if necessary/possible. */
-+	retval = yaffs_check_tags_ecc((struct yaffs_tags *)&pt1);
-+	switch (retval) {
-+	case 0:
-+		/* no tags error, use MTD result */
-+		break;
-+	case 1:
-+		/* recovered tags-ECC error */
-+		dev->n_tags_ecc_fixed++;
-+		if (ecc_result == YAFFS_ECC_RESULT_NO_ERROR)
-+			ecc_result = YAFFS_ECC_RESULT_FIXED;
-+		break;
-+	default:
-+		/* unrecovered tags-ECC error */
-+		dev->n_tags_ecc_unfixed++;
-+		return return_empty_tags(tags, YAFFS_ECC_RESULT_UNFIXED,
-+					 YAFFS_FAIL);
-+	}
-+
-+	/* Unpack the tags to extended form and set ECC result.
-+	 * [set should_be_ff just to keep yaffs_unpack_tags1 happy]
-+	 */
-+	pt1.should_be_ff = 0xffffffff;
-+	yaffs_unpack_tags1(tags, &pt1);
-+	tags->ecc_result = ecc_result;
-+
-+	/* Set deleted state */
-+	tags->is_deleted = deleted;
-+	return YAFFS_OK;
-+}
-+
-+static int yaffs_tags_compat_mark_bad(struct yaffs_dev *dev, int block_no)
-+{
-+	return dev->drv.drv_mark_bad_fn(dev, block_no);
-+}
-+
-+static int yaffs_tags_compat_query_block(struct yaffs_dev *dev,
-+					 int block_no,
-+					 enum yaffs_block_state *state,
-+					 u32 *seq_number)
-+{
-+	struct yaffs_ext_tags tags;
-+	int retval;
-+
-+	yaffs_trace(YAFFS_TRACE_MTD, "%s %d", __func__, block_no);
-+
-+	*seq_number = 0;
-+
-+	retval = dev->drv.drv_check_bad_fn(dev, block_no);
-+	if (retval == YAFFS_FAIL) {
-+		*state = YAFFS_BLOCK_STATE_DEAD;
-+		goto out;
-+	}
-+
-+	yaffs_tags_compat_read(dev, block_no * dev->param.chunks_per_block,
-+			       NULL, &tags);
-+
-+	if (tags.ecc_result != YAFFS_ECC_RESULT_NO_ERROR) {
-+		yaffs_trace(YAFFS_TRACE_MTD, "block %d is marked bad",
-+			    block_no);
-+		*state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
-+	} else if (tags.chunk_used) {
-+		*seq_number = tags.seq_number;
-+		*state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
-+	} else {
-+		*state = YAFFS_BLOCK_STATE_EMPTY;
-+	}
-+
-+	retval = YAFFS_OK;
-+
-+out:
-+	yaffs_trace(YAFFS_TRACE_MTD,
-+		    "block query returns seq %u state %d",
-+		    *seq_number, *state);
-+
-+	return retval;
-+}
-+
-+void yaffs_tags_compat_install(struct yaffs_dev *dev)
-+{
-+	if (dev->param.is_yaffs2)
-+		return;
-+
-+	if (!dev->tagger.write_chunk_tags_fn)
-+		dev->tagger.write_chunk_tags_fn = yaffs_tags_compat_write;
-+
-+	if (!dev->tagger.read_chunk_tags_fn)
-+		dev->tagger.read_chunk_tags_fn = yaffs_tags_compat_read;
-+
-+	if (!dev->tagger.query_block_fn)
-+		dev->tagger.query_block_fn = yaffs_tags_compat_query_block;
-+
-+	if (!dev->tagger.mark_bad_fn)
-+		dev->tagger.mark_bad_fn = yaffs_tags_compat_mark_bad;
-+}
-+#endif

target/linux/generic/patches-4.4/503-yaffs-add-tags-9bytes-mount-option.patch

@@ -1,115 +0,0 @@
-Subject: yaffs: add support for tags-9bytes mount option
-
-Signed-off-by: Gabor Juhos <[email protected]>
----
---- a/fs/yaffs2/yaffs_vfs.c
-+++ b/fs/yaffs2/yaffs_vfs.c
-@@ -2644,6 +2644,7 @@ static const struct super_operations yaf
- 
- struct yaffs_options {
- 	int inband_tags;
-+	int tags_9bytes;
- 	int skip_checkpoint_read;
- 	int skip_checkpoint_write;
- 	int no_cache;
-@@ -2683,6 +2684,8 @@ static int yaffs_parse_options(struct ya
- 
- 		if (!strcmp(cur_opt, "inband-tags")) {
- 			options->inband_tags = 1;
-+		} else if (!strcmp(cur_opt, "tags-9bytes")) {
-+			options->tags_9bytes = 1;
- 		} else if (!strcmp(cur_opt, "tags-ecc-off")) {
- 			options->tags_ecc_on = 0;
- 			options->tags_ecc_overridden = 1;
-@@ -2756,7 +2759,6 @@ static struct super_block *yaffs_interna
- 	struct yaffs_param *param;
- 
- 	int read_only = 0;
--	int inband_tags = 0;
- 
- 	struct yaffs_options options;
- 
-@@ -2796,6 +2798,9 @@ static struct super_block *yaffs_interna
- 
- 	memset(&options, 0, sizeof(options));
- 
-+	if (IS_ENABLED(CONFIG_YAFFS_9BYTE_TAGS))
-+		options.tags_9bytes = 1;
-+
- 	if (yaffs_parse_options(&options, data_str)) {
- 		/* Option parsing failed */
- 		return NULL;
-@@ -2829,17 +2834,22 @@ static struct super_block *yaffs_interna
- 	}
- 
- 	/* Added NCB 26/5/2006 for completeness */
--	if (yaffs_version == 2 && !options.inband_tags
--	    && WRITE_SIZE(mtd) == 512) {
-+	if (yaffs_version == 2 &&
-+	    (!options.inband_tags || options.tags_9bytes) &&
-+	    WRITE_SIZE(mtd) == 512) {
- 		yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs1");
- 		yaffs_version = 1;
- 	}
- 
--	if (mtd->oobavail < sizeof(struct yaffs_packed_tags2) ||
--	    options.inband_tags)
--		inband_tags = 1;
-+	if (yaffs_version == 2 &&
-+	    mtd->oobavail < sizeof(struct yaffs_packed_tags2)) {
-+		yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting inband tags");
-+		options.inband_tags = 1;
-+	}
- 
--	if(yaffs_verify_mtd(mtd, yaffs_version, inband_tags) < 0)
-+	err = yaffs_verify_mtd(mtd, yaffs_version, options.inband_tags,
-+			       options.tags_9bytes);
-+	if (err < 0)
- 		return NULL;
- 
- 	/* OK, so if we got here, we have an MTD that's NAND and looks
-@@ -2896,7 +2906,8 @@ static struct super_block *yaffs_interna
- 
- 	param->n_reserved_blocks = 5;
- 	param->n_caches = (options.no_cache) ? 0 : 10;
--	param->inband_tags = inband_tags;
-+	param->inband_tags = options.inband_tags;
-+	param->tags_9bytes = options.tags_9bytes;
- 
- 	param->enable_xattr = 1;
- 	if (options.lazy_loading_overridden)
---- a/fs/yaffs2/yaffs_mtdif.c
-+++ b/fs/yaffs2/yaffs_mtdif.c
-@@ -278,7 +278,8 @@ struct mtd_info * yaffs_get_mtd_device(d
- 	return mtd;
- }
- 
--int yaffs_verify_mtd(struct mtd_info *mtd, int yaffs_version, int inband_tags)
-+int yaffs_verify_mtd(struct mtd_info *mtd, int yaffs_version, int inband_tags,
-+		     int tags_9bytes)
- {
- 	if (yaffs_version == 2) {
- 		if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
-@@ -297,6 +298,12 @@ int yaffs_verify_mtd(struct mtd_info *mt
- 			);
- 			return -1;
- 		}
-+
-+		if (tags_9bytes && mtd->oobavail < 9) {
-+			yaffs_trace(YAFFS_TRACE_ALWAYS,
-+				    "MTD device does not support 9-byte tags");
-+			return -1;
-+		}
- 	}
- 
- 	return 0;
---- a/fs/yaffs2/yaffs_mtdif.h
-+++ b/fs/yaffs2/yaffs_mtdif.h
-@@ -21,5 +21,6 @@
- void yaffs_mtd_drv_install(struct yaffs_dev *dev);
- struct mtd_info * yaffs_get_mtd_device(dev_t sdev);
- void yaffs_put_mtd_device(struct mtd_info *mtd);
--int yaffs_verify_mtd(struct mtd_info *mtd, int yaffs_version, int inband_tags);
-+int yaffs_verify_mtd(struct mtd_info *mtd, int yaffs_version, int inband_tags,
-+		     int tags_9bytes);
- #endif

target/linux/generic/patches-4.4/504-yaffs-3.16-new-fops.patch

@@ -1,29 +0,0 @@
---- a/fs/yaffs2/yaffs_vfs.c
-+++ b/fs/yaffs2/yaffs_vfs.c
-@@ -774,7 +774,25 @@ static int yaffs_sync_object(struct file
- }
- 
- 
--#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 22))
-+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 16, 0))
-+static const struct file_operations yaffs_file_operations = {
-+#if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 1, 0))
-+	.read = new_sync_read,
-+#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(4, 1, 0) */
-+	.read_iter = generic_file_read_iter,
-+#if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 1, 0))
-+	.write = new_sync_write,
-+#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(4, 1, 0) */
-+	.write_iter = generic_file_write_iter,
-+	.mmap = generic_file_mmap,
-+	.flush = yaffs_file_flush,
-+	.fsync = yaffs_sync_object,
-+	.splice_read = generic_file_splice_read,
-+	.splice_write = iter_file_splice_write,
-+	.llseek = generic_file_llseek,
-+};
-+
-+#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 22))
- static const struct file_operations yaffs_file_operations = {
- 	.read = do_sync_read,
- 	.write = do_sync_write,

target/linux/generic/patches-4.4/505-yaffs-3.19-f_dentry-remove.patch

@@ -1,95 +0,0 @@
---- a/fs/yaffs2/yaffs_vfs.c
-+++ b/fs/yaffs2/yaffs_vfs.c
-@@ -283,7 +283,7 @@ static int yaffs_readpage_nolock(struct
- 		(long long)pos,
- 		(unsigned)PAGE_CACHE_SIZE);
- 
--	obj = yaffs_dentry_to_obj(f->f_dentry);
-+	obj = yaffs_dentry_to_obj(f->f_path.dentry);
- 
- 	dev = obj->my_dev;
- 
-@@ -481,7 +481,7 @@ static ssize_t yaffs_hold_space(struct f
- 
- 	int n_free_chunks;
- 
--	obj = yaffs_dentry_to_obj(f->f_dentry);
-+	obj = yaffs_dentry_to_obj(f->f_path.dentry);
- 
- 	dev = obj->my_dev;
- 
-@@ -499,7 +499,7 @@ static void yaffs_release_space(struct f
- 	struct yaffs_obj *obj;
- 	struct yaffs_dev *dev;
- 
--	obj = yaffs_dentry_to_obj(f->f_dentry);
-+	obj = yaffs_dentry_to_obj(f->f_path.dentry);
- 
- 	dev = obj->my_dev;
- 
-@@ -591,7 +591,7 @@ static ssize_t yaffs_file_write(struct f
- 	struct inode *inode;
- 	struct yaffs_dev *dev;
- 
--	obj = yaffs_dentry_to_obj(f->f_dentry);
-+	obj = yaffs_dentry_to_obj(f->f_path.dentry);
- 
- 	if (!obj) {
- 		yaffs_trace(YAFFS_TRACE_OS,
-@@ -603,7 +603,7 @@ static ssize_t yaffs_file_write(struct f
- 
- 	yaffs_gross_lock(dev);
- 
--	inode = f->f_dentry->d_inode;
-+	inode = f->f_path.dentry->d_inode;
- 
- 	if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
- 		ipos = inode->i_size;
-@@ -727,7 +727,7 @@ static int yaffs_file_flush(struct file
- static int yaffs_file_flush(struct file *file)
- #endif
- {
--	struct yaffs_obj *obj = yaffs_dentry_to_obj(file->f_dentry);
-+	struct yaffs_obj *obj = yaffs_dentry_to_obj(file->f_path.dentry);
- 
- 	struct yaffs_dev *dev = obj->my_dev;
- 
-@@ -1734,7 +1734,7 @@ static int yaffs_iterate(struct file *f,
- 
- 	char name[YAFFS_MAX_NAME_LENGTH + 1];
- 
--	obj = yaffs_dentry_to_obj(f->f_dentry);
-+	obj = yaffs_dentry_to_obj(f->f_path.dentry);
- 	dev = obj->my_dev;
- 
- 	yaffs_gross_lock(dev);
-@@ -1798,14 +1798,14 @@ static int yaffs_readdir(struct file *f,
- 	struct yaffs_obj *obj;
- 	struct yaffs_dev *dev;
- 	struct yaffs_search_context *sc;
--	struct inode *inode = f->f_dentry->d_inode;
-+	struct inode *inode = f->f_path.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);
-+	obj = yaffs_dentry_to_obj(f->f_path.dentry);
- 	dev = obj->my_dev;
- 
- 	yaffs_gross_lock(dev);
-@@ -1839,10 +1839,10 @@ static int yaffs_readdir(struct file *f,
- 	if (offset == 1) {
- 		yaffs_trace(YAFFS_TRACE_OS,
- 			"yaffs_readdir: entry .. ino %d",
--			(int)f->f_dentry->d_parent->d_inode->i_ino);
-+			(int)f->f_path.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,
-+			    f->f_path.dentry->d_parent->d_inode->i_ino,
- 			    DT_DIR) < 0) {
- 			yaffs_gross_lock(dev);
- 			goto out;

target/linux/generic/patches-4.4/506-yaffs2-using-new-follow_link-and-put_link.patch

@@ -1,47 +0,0 @@
-From d4eb3ab036f8c37c5bc5f45ad0fa4dc34b7228c8 Mon Sep 17 00:00:00 2001
-From: Kevin Hao <[email protected]>
-Date: Wed, 24 Feb 2016 14:37:13 +0800
-Subject: [PATCH 3/3] yaffs2: using new ->follow_link() and ->put_link()
- calling conventions
-
-As what we did in commit 680baacbca69 ("new ->follow_link() and
-->put_link() calling conventions").
-
-Signed-off-by: Kevin Hao <[email protected]>
-Signed-off-by: Bruce Ashfield <[email protected]>
----
- fs/yaffs2/yaffs_vfs.c | 8 ++++----
- 1 file changed, 4 insertions(+), 4 deletions(-)
-
---- a/fs/yaffs2/yaffs_vfs.c
-+++ b/fs/yaffs2/yaffs_vfs.c
-@@ -1060,7 +1060,7 @@ static int yaffs_readlink(struct dentry
- }
- 
- #if (YAFFS_NEW_FOLLOW_LINK == 1)
--static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
-+static const char *yaffs_follow_link(struct dentry *dentry, void **cookie)
- {
- 	void *ret;
- #else
-@@ -1082,7 +1082,7 @@ static int yaffs_follow_link(struct dent
- 		goto out;
- 	}
- #if (YAFFS_NEW_FOLLOW_LINK == 1)
--	nd_set_link(nd, alias);
-+	*cookie = alias;
- 	ret = alias;
- out:
- 	if (ret_int)
-@@ -1114,9 +1114,9 @@ static void yaffs_put_inode(struct inode
- #endif
- 
- #if (YAFFS_NEW_FOLLOW_LINK == 1)
--void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias)
-+void yaffs_put_link(struct inode *inode, void *cookie)
- {
--	kfree(alias);
-+	kfree(cookie);
- }
- #endif
- 

target/linux/generic/patches-4.4/903-debloat_direct_io.patch

@@ -1,6 +1,6 @@
 --- a/fs/Kconfig
 +++ b/fs/Kconfig
-@@ -74,6 +74,11 @@ config FILE_LOCKING
+@@ -73,6 +73,11 @@ config FILE_LOCKING
            for filesystems like NFS and for the flock() system
            call. Disabling this option saves about 11k.