- 根目录:
- fs
- yaffs2
- yaffs_verify.c
/*
* YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
*
* Copyright (C) 2002-2010 Aleph One Ltd.
* for Toby Churchill Ltd and Brightstar Engineering
*
* Created by Charles Manning <charles@aleph1.co.uk>
*
* 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)
{
dev = dev;
return !(yaffs_trace_mask &
(YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
}
static int yaffs_skip_full_verification(struct yaffs_dev *dev)
{
dev = dev;
return !(yaffs_trace_mask & (YAFFS_TRACE_VERIFY_FULL));
}
static int yaffs_skip_nand_verification(struct yaffs_dev *dev)
{
dev = dev;
return !(yaffs_trace_mask & (YAFFS_TRACE_VERIFY_NAND));
}
static const char *block_state_name[] = {
"Unknown",
"Needs scanning",
"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_SCANNING:
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) /* Trashed name */
yaffs_trace(YAFFS_TRACE_VERIFY,
"Obj %d header name is 0xFF",
obj->obj_id);
}
void yaffs_verify_file(struct yaffs_obj *obj)
{
int required_depth;
int actual_depth;
u32 last_chunk;
u32 x;
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 */
last_chunk =
obj->variant.file_variant.file_size / dev->data_bytes_per_chunk + 1;
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) {
u32 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, __LINE__);
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, __LINE__);
}
/* 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) {
if (lh) {
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");
YBUG();
return;
}
if (yaffs_skip_verification(obj->my_dev))
return;
if (!obj->parent) {
yaffs_trace(YAFFS_TRACE_ALWAYS, "Object does not have parent" );
YBUG();
return;
}
if (obj->parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
yaffs_trace(YAFFS_TRACE_ALWAYS, "Parent is not directory");
YBUG();
}
/* Iterate through the objects in each hash entry */
list_for_each(lh, &obj->parent->variant.dir_variant.children) {
if (lh) {
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);
YBUG();
}
}
void yaffs_verify_dir(struct yaffs_obj *directory)
{
struct list_head *lh;
struct yaffs_obj *list_obj;
if (!directory) {
YBUG();
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);
YBUG();
}
/* Iterate through the objects in each hash entry */
list_for_each(lh, &directory->variant.dir_variant.children) {
if (lh) {
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);
YBUG();
}
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)
{
in = in;
return YAFFS_OK;
}