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yaffs_yaffs2.c
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/*
* YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
*
* Copyright (C) 2002-2018 Aleph One Ltd.
*
* Created by Charles Manning <charles@aleph1.co.uk>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include "yaffs_guts.h"
#include "yaffs_trace.h"
#include "yaffs_yaffs2.h"
#include "yaffs_checkptrw.h"
#include "yaffs_bitmap.h"
#include "yaffs_nand.h"
#include "yaffs_getblockinfo.h"
#include "yaffs_verify.h"
#include "yaffs_attribs.h"
#include "yaffs_summary.h"
#include "yaffs_endian.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)
{
u32 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 &&
(u32)(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 void yaffs2_do_endian_validity_marker(struct yaffs_dev *dev,
struct yaffs_checkpt_validity *v)
{
if (!dev->swap_endian)
return;
v->struct_type = swap_s32(v->struct_type);
v->magic = swap_u32(v->magic);
v->version = swap_u32(v->version);
v->head = swap_u32(v->head);
}
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;
yaffs2_do_endian_validity_marker(dev, &cp);
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));
yaffs2_do_endian_validity_marker(dev, &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->struct_type = sizeof(*cp);
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 void yaffs2_do_endian_checkpt_dev(struct yaffs_dev *dev,
struct yaffs_checkpt_dev *cp)
{
if (!dev->swap_endian)
return;
cp->struct_type = swap_s32(cp->struct_type);
cp->n_erased_blocks = swap_s32(cp->n_erased_blocks);
cp->alloc_block = swap_s32(cp->alloc_block);
cp->alloc_page = swap_u32(cp->alloc_page);
cp->n_free_chunks = swap_s32(cp->n_free_chunks);
cp->n_deleted_files = swap_s32(cp->n_deleted_files);
cp->n_unlinked_files = swap_s32(cp->n_unlinked_files);
cp->n_bg_deletions = swap_s32(cp->n_bg_deletions);
}
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;
u32 i;
union yaffs_block_info_union bu;
/* Write device runtime values */
yaffs2_dev_to_checkpt_dev(&cp, dev);
yaffs2_do_endian_checkpt_dev(dev, &cp);
ok = (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp));
if (!ok)
return 0;
/* Write block info. */
if (!dev->swap_endian) {
n_bytes = n_blocks * sizeof(struct yaffs_block_info);
ok = (yaffs2_checkpt_wr(dev, dev->block_info, n_bytes) ==
(int)n_bytes);
} else {
/*
* Need to swap the endianisms. We can't do this in place
* since that would damage live data,
* so write one block info at a time using a copy.
*/
for (i = 0; i < n_blocks && ok; i++) {
bu.bi = dev->block_info[i];
bu.as_u32[0] = swap_u32(bu.as_u32[0]);
bu.as_u32[1] = swap_u32(bu.as_u32[1]);
ok = (yaffs2_checkpt_wr(dev, &bu, sizeof(bu)) == sizeof(bu));
}
}
if (!ok)
return 0;
/*
* Write chunk bits. Chunk bits are in bytes so
* no endian conversion is needed.
*/
n_bytes = n_blocks * dev->chunk_bit_stride;
ok = (yaffs2_checkpt_wr(dev, dev->chunk_bits, n_bytes) ==
(int)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;
yaffs2_do_endian_checkpt_dev(dev, &cp);
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) ==
(int)n_bytes);
if (!ok)
return 0;
if (dev->swap_endian) {
/* The block info can just be handled as a list of u32s. */
u32 *as_u32 = (u32 *) dev->block_info;
u32 n_u32s = n_bytes/sizeof(u32);
u32 i;
for (i=0; i < n_u32s; i++)
as_u32[i] = swap_u32(as_u32[i]);
}
n_bytes = n_blocks * dev->chunk_bit_stride;
ok = (yaffs2_checkpt_rd(dev, dev->chunk_bits, n_bytes) ==
(int)n_bytes);
return ok ? 1 : 0;
}
static void yaffs2_checkpt_obj_bit_assign(struct yaffs_checkpt_obj *cp,
int bit_offset,
int bit_width,
u32 value)
{
u32 and_mask;
and_mask = ((1<<bit_width)-1) << bit_offset;
cp->bit_field &= ~and_mask;
cp->bit_field |= ((value << bit_offset) & and_mask);
}
static u32 yaffs2_checkpt_obj_bit_get(struct yaffs_checkpt_obj *cp,
int bit_offset,
int bit_width)
{
u32 and_mask;
and_mask = ((1<<bit_width)-1);
return (cp->bit_field >> bit_offset) & and_mask;
}
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;
yaffs2_checkpt_obj_bit_assign(cp, CHECKPOINT_VARIANT_BITS, obj->variant_type);
yaffs2_checkpt_obj_bit_assign(cp, CHECKPOINT_DELETED_BITS, obj->deleted);
yaffs2_checkpt_obj_bit_assign(cp, CHECKPOINT_SOFT_DEL_BITS, obj->soft_del);
yaffs2_checkpt_obj_bit_assign(cp, CHECKPOINT_UNLINKED_BITS, obj->unlinked);
yaffs2_checkpt_obj_bit_assign(cp, CHECKPOINT_FAKE_BITS, obj->fake);
yaffs2_checkpt_obj_bit_assign(cp, CHECKPOINT_RENAME_ALLOWED_BITS, obj->rename_allowed);
yaffs2_checkpt_obj_bit_assign(cp, CHECKPOINT_UNLINK_ALLOWED_BITS, obj->unlink_allowed);
yaffs2_checkpt_obj_bit_assign(cp, CHECKPOINT_SERIAL_BITS, 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;
u32 cp_variant_type = yaffs2_checkpt_obj_bit_get(cp, CHECKPOINT_VARIANT_BITS);
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 = yaffs2_checkpt_obj_bit_get(cp, CHECKPOINT_VARIANT_BITS);
obj->deleted = yaffs2_checkpt_obj_bit_get(cp, CHECKPOINT_DELETED_BITS);
obj->soft_del = yaffs2_checkpt_obj_bit_get(cp, CHECKPOINT_SOFT_DEL_BITS);
obj->unlinked = yaffs2_checkpt_obj_bit_get(cp, CHECKPOINT_UNLINKED_BITS);
obj->fake = yaffs2_checkpt_obj_bit_get(cp, CHECKPOINT_FAKE_BITS);
obj->rename_allowed = yaffs2_checkpt_obj_bit_get(cp, CHECKPOINT_RENAME_ALLOWED_BITS);
obj->unlink_allowed = yaffs2_checkpt_obj_bit_get(cp, CHECKPOINT_UNLINK_ALLOWED_BITS);
obj->serial = yaffs2_checkpt_obj_bit_get(cp, CHECKPOINT_SERIAL_BITS);
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;
obj->variant.file_variant.stored_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 void yaffs2_do_endian_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
{
int i;
u32 *as_u32 = (u32 *)tn;
int tnode_size_u32 = dev->tnode_size / sizeof(u32);
if (!dev->swap_endian)
return;
/* Swap all the tnode data as u32s to fix endianisms. */
for (i = 0; i<tnode_size_u32; i++)
as_u32[i] = swap_u32(as_u32[i]);
}
struct yaffs_tnode *yaffs2_do_endian_tnode_copy(struct yaffs_dev *dev,
struct yaffs_tnode *tn)
{
if (!dev->swap_endian)
return tn;
memcpy(dev->tn_swap_buffer, tn, dev->tnode_size);
tn = dev->tn_swap_buffer;
yaffs2_do_endian_tnode(dev, tn);
return tn;
}
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;
yaffs_do_endian_u32(dev, &base_offset);
ok = (yaffs2_checkpt_wr(dev, &base_offset, sizeof(base_offset)) ==
sizeof(base_offset));
if (ok) {
/*
* NB Can't do an in-place endian swizzle since that would
* damage current tnode data.
* If a tnode endian conversion is required we do a copy.
*/
tn = yaffs2_do_endian_tnode_copy(dev, tn);
ok = (yaffs2_checkpt_wr(dev, tn, dev->tnode_size) ==
(int)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));
yaffs_do_endian_u32(dev, &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) ==
(int)dev->tnode_size);
yaffs2_do_endian_tnode(dev, tn);
}
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_do_endian_u32(dev, &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 void yaffs2_do_endian_checkpt_obj(struct yaffs_dev *dev,
struct yaffs_checkpt_obj *cp)
{
if (!dev->swap_endian)
return;
cp->struct_type = swap_s32(cp->struct_type);
cp->obj_id = swap_u32(cp->obj_id);
cp->parent_id = swap_u32(cp->parent_id);
cp->hdr_chunk = swap_s32(cp->hdr_chunk);
cp->bit_field = swap_u32(cp->bit_field);
cp->n_data_chunks = swap_s32(cp->n_data_chunks);
cp->size_or_equiv_obj = swap_loff_t(cp->size_or_equiv_obj);
}
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;
u32 cp_variant_type;
/* Iterate through the objects in each hash entry,
* dumping them to the checkpointing stream.
*/
(void) cp_variant_type;
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);
cp_variant_type = yaffs2_checkpt_obj_bit_get(
&cp, CHECKPOINT_VARIANT_BITS);
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);
yaffs2_do_endian_checkpt_obj (dev, &cp);
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);
yaffs2_do_endian_checkpt_obj (dev, &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;
u32 cp_variant_type;
LIST_HEAD(hard_list);
while (ok && !done) {
ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == sizeof(cp));
yaffs2_do_endian_checkpt_obj (dev, &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;
}
cp_variant_type = yaffs2_checkpt_obj_bit_get(
&cp, CHECKPOINT_VARIANT_BITS);
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 == (u32)(~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);
yaffs_do_endian_u32(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;
yaffs_do_endian_u32(dev, &checkpt_sum1);
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;
}