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openwrt-xburst/target/linux/generic/files/fs/yaffs2/yaffs_verify.c

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/*
* 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(yaffs_dev_t *dev)
{
dev=dev;
return !(yaffs_trace_mask & (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
}
static int yaffs_skip_full_verification(yaffs_dev_t *dev)
{
dev=dev;
return !(yaffs_trace_mask & (YAFFS_TRACE_VERIFY_FULL));
}
static int yaffs_skip_nand_verification(yaffs_dev_t *dev)
{
dev=dev;
return !(yaffs_trace_mask & (YAFFS_TRACE_VERIFY_NAND));
}
static const char *block_stateName[] = {
"Unknown",
"Needs scanning",
"Scanning",
"Empty",
"Allocating",
"Full",
"Dirty",
"Checkpoint",
"Collecting",
"Dead"
};
void yaffs_verify_blk(yaffs_dev_t *dev, yaffs_block_info_t *bi, int n)
{
int actuallyUsed;
int inUse;
if (yaffs_skip_verification(dev))
return;
/* Report illegal runtime states */
if (bi->block_state >= YAFFS_NUMBER_OF_BLOCK_STATES)
T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has undefined state %d"TENDSTR), n, bi->block_state));
switch (bi->block_state) {
case YAFFS_BLOCK_STATE_UNKNOWN:
case YAFFS_BLOCK_STATE_SCANNING:
case YAFFS_BLOCK_STATE_NEEDS_SCANNING:
T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has bad run-state %s"TENDSTR),
n, block_stateName[bi->block_state]));
}
/* Check pages in use and soft deletions are legal */
actuallyUsed = 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 ||
actuallyUsed < 0 || actuallyUsed > dev->param.chunks_per_block)
T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has illegal values pages_in_used %d soft_del_pages %d"TENDSTR),
n, bi->pages_in_use, bi->soft_del_pages));
/* Check chunk bitmap legal */
inUse = yaffs_count_chunk_bits(dev, n);
if (inUse != bi->pages_in_use)
T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has inconsistent values pages_in_use %d counted chunk bits %d"TENDSTR),
n, bi->pages_in_use, inUse));
}
void yaffs_verify_collected_blk(yaffs_dev_t *dev, yaffs_block_info_t *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) {
T(YAFFS_TRACE_ERROR, (TSTR("Block %d is in state %d after gc, should be erased"TENDSTR),
n, bi->block_state));
}
}
void yaffs_verify_blocks(yaffs_dev_t *dev)
{
int i;
int nBlocksPerState[YAFFS_NUMBER_OF_BLOCK_STATES];
int nIllegalBlockStates = 0;
if (yaffs_skip_verification(dev))
return;
memset(nBlocksPerState, 0, sizeof(nBlocksPerState));
for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
yaffs_block_info_t *bi = yaffs_get_block_info(dev, i);
yaffs_verify_blk(dev, bi, i);
if (bi->block_state < YAFFS_NUMBER_OF_BLOCK_STATES)
nBlocksPerState[bi->block_state]++;
else
nIllegalBlockStates++;
}
T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR)));
T(YAFFS_TRACE_VERIFY, (TSTR("Block summary"TENDSTR)));
T(YAFFS_TRACE_VERIFY, (TSTR("%d blocks have illegal states"TENDSTR), nIllegalBlockStates));
if (nBlocksPerState[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
T(YAFFS_TRACE_VERIFY, (TSTR("Too many allocating blocks"TENDSTR)));
for (i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
T(YAFFS_TRACE_VERIFY,
(TSTR("%s %d blocks"TENDSTR),
block_stateName[i], nBlocksPerState[i]));
if (dev->blocks_in_checkpt != nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT])
T(YAFFS_TRACE_VERIFY,
(TSTR("Checkpoint block count wrong dev %d count %d"TENDSTR),
dev->blocks_in_checkpt, nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT]));
if (dev->n_erased_blocks != nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY])
T(YAFFS_TRACE_VERIFY,
(TSTR("Erased block count wrong dev %d count %d"TENDSTR),
dev->n_erased_blocks, nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY]));
if (nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING] > 1)
T(YAFFS_TRACE_VERIFY,
(TSTR("Too many collecting blocks %d (max is 1)"TENDSTR),
nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING]));
T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR)));
}
/*
* 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(yaffs_obj_t *obj, yaffs_obj_header *oh, yaffs_ext_tags *tags, int parentCheck)
{
if (obj && yaffs_skip_verification(obj->my_dev))
return;
if (!(tags && obj && oh)) {
T(YAFFS_TRACE_VERIFY,
(TSTR("Verifying object header tags %p obj %p oh %p"TENDSTR),
tags, obj, oh));
return;
}
if (oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
oh->type > YAFFS_OBJECT_TYPE_MAX)
T(YAFFS_TRACE_VERIFY,
(TSTR("Obj %d header type is illegal value 0x%x"TENDSTR),
tags->obj_id, oh->type));
if (tags->obj_id != obj->obj_id)
T(YAFFS_TRACE_VERIFY,
(TSTR("Obj %d header mismatch obj_id %d"TENDSTR),
tags->obj_id, obj->obj_id));
/*
* Check that the object's parent ids match if parentCheck requested.
*
* Tests do not apply to the root object.
*/
if (parentCheck && tags->obj_id > 1 && !obj->parent)
T(YAFFS_TRACE_VERIFY,
(TSTR("Obj %d header mismatch parent_id %d obj->parent is NULL"TENDSTR),
tags->obj_id, oh->parent_obj_id));
if (parentCheck && obj->parent &&
oh->parent_obj_id != obj->parent->obj_id &&
(oh->parent_obj_id != YAFFS_OBJECTID_UNLINKED ||
obj->parent->obj_id != YAFFS_OBJECTID_DELETED))
T(YAFFS_TRACE_VERIFY,
(TSTR("Obj %d header mismatch parent_id %d parent_obj_id %d"TENDSTR),
tags->obj_id, oh->parent_obj_id, obj->parent->obj_id));
if (tags->obj_id > 1 && oh->name[0] == 0) /* Null name */
T(YAFFS_TRACE_VERIFY,
(TSTR("Obj %d header name is NULL"TENDSTR),
obj->obj_id));
if (tags->obj_id > 1 && ((__u8)(oh->name[0])) == 0xff) /* Trashed name */
T(YAFFS_TRACE_VERIFY,
(TSTR("Obj %d header name is 0xFF"TENDSTR),
obj->obj_id));
}
#if 0
/* Not being used, but don't want to throw away yet */
int yaffs_verify_tnode_worker(yaffs_obj_t *obj, yaffs_tnode_t *tn,
__u32 level, int chunk_offset)
{
int i;
yaffs_dev_t *dev = obj->my_dev;
int ok = 1;
if (tn) {
if (level > 0) {
for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
if (tn->internal[i]) {
ok = yaffs_verify_tnode_worker(obj,
tn->internal[i],
level - 1,
(chunk_offset<<YAFFS_TNODES_INTERNAL_BITS) + i);
}
}
} else if (level == 0) {
yaffs_ext_tags tags;
__u32 obj_id = obj->obj_id;
chunk_offset <<= YAFFS_TNODES_LEVEL0_BITS;
for (i = 0; i < YAFFS_NTNODES_LEVEL0; i++) {
__u32 theChunk = yaffs_get_group_base(dev, tn, i);
if (theChunk > 0) {
/* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),tags.obj_id,tags.chunk_id,theChunk)); */
yaffs_rd_chunk_tags_nand(dev, theChunk, NULL, &tags);
if (tags.obj_id != obj_id || tags.chunk_id != chunk_offset) {
T(~0, (TSTR("Object %d chunk_id %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
obj_id, chunk_offset, theChunk,
tags.obj_id, tags.chunk_id));
}
}
chunk_offset++;
}
}
}
return ok;
}
#endif
void yaffs_verify_file(yaffs_obj_t *obj)
{
int requiredTallness;
int actualTallness;
__u32 lastChunk;
__u32 x;
__u32 i;
yaffs_dev_t *dev;
yaffs_ext_tags tags;
yaffs_tnode_t *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 */
lastChunk = obj->variant.file_variant.file_size / dev->data_bytes_per_chunk + 1;
x = lastChunk >> YAFFS_TNODES_LEVEL0_BITS;
requiredTallness = 0;
while (x > 0) {
x >>= YAFFS_TNODES_INTERNAL_BITS;
requiredTallness++;
}
actualTallness = 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 <= lastChunk; i++) {
tn = yaffs_find_tnode_0(dev, &obj->variant.file_variant, i);
if (tn) {
__u32 theChunk = yaffs_get_group_base(dev, tn, i);
if (theChunk > 0) {
/* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),obj_id,i,theChunk)); */
yaffs_rd_chunk_tags_nand(dev, theChunk, NULL, &tags);
if (tags.obj_id != obj_id || tags.chunk_id != i) {
T(~0, (TSTR("Object %d chunk_id %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
obj_id, i, theChunk,
tags.obj_id, tags.chunk_id));
}
}
}
}
}
void yaffs_verify_link(yaffs_obj_t *obj)
{
if (obj && yaffs_skip_verification(obj->my_dev))
return;
/* Verify sane equivalent object */
}
void yaffs_verify_symlink(yaffs_obj_t *obj)
{
if (obj && yaffs_skip_verification(obj->my_dev))
return;
/* Verify symlink string */
}
void yaffs_verify_special(yaffs_obj_t *obj)
{
if (obj && yaffs_skip_verification(obj->my_dev))
return;
}
void yaffs_verify_obj(yaffs_obj_t *obj)
{
yaffs_dev_t *dev;
__u32 chunkMin;
__u32 chunkMax;
__u32 chunk_idOk;
__u32 chunkInRange;
__u32 chunkShouldNotBeDeleted;
__u32 chunkValid;
if (!obj)
return;
if (obj->being_created)
return;
dev = obj->my_dev;
if (yaffs_skip_verification(dev))
return;
/* Check sane object header chunk */
chunkMin = dev->internal_start_block * dev->param.chunks_per_block;
chunkMax = (dev->internal_end_block+1) * dev->param.chunks_per_block - 1;
chunkInRange = (((unsigned)(obj->hdr_chunk)) >= chunkMin && ((unsigned)(obj->hdr_chunk)) <= chunkMax);
chunk_idOk = chunkInRange || (obj->hdr_chunk == 0);
chunkValid = chunkInRange &&
yaffs_check_chunk_bit(dev,
obj->hdr_chunk / dev->param.chunks_per_block,
obj->hdr_chunk % dev->param.chunks_per_block);
chunkShouldNotBeDeleted = chunkInRange && !chunkValid;
if (!obj->fake &&
(!chunk_idOk || chunkShouldNotBeDeleted)) {
T(YAFFS_TRACE_VERIFY,
(TSTR("Obj %d has chunk_id %d %s %s"TENDSTR),
obj->obj_id, obj->hdr_chunk,
chunk_idOk ? "" : ",out of range",
chunkShouldNotBeDeleted ? ",marked as deleted" : ""));
}
if (chunkValid && !yaffs_skip_nand_verification(dev)) {
yaffs_ext_tags tags;
yaffs_obj_header *oh;
__u8 *buffer = yaffs_get_temp_buffer(dev, __LINE__);
oh = (yaffs_obj_header *)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)) {
T(YAFFS_TRACE_VERIFY,
(TSTR("Obj %d has parent pointer %p which does not look like an object"TENDSTR),
obj->obj_id, obj->parent));
}
/* Verify parent is a directory */
if (obj->parent && obj->parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
T(YAFFS_TRACE_VERIFY,
(TSTR("Obj %d's parent is not a directory (type %d)"TENDSTR),
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:
T(YAFFS_TRACE_VERIFY,
(TSTR("Obj %d has illegaltype %d"TENDSTR),
obj->obj_id, obj->variant_type));
break;
}
}
void yaffs_verify_objects(yaffs_dev_t *dev)
{
yaffs_obj_t *obj;
int i;
struct ylist_head *lh;
if (yaffs_skip_verification(dev))
return;
/* Iterate through the objects in each hash entry */
for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
ylist_for_each(lh, &dev->obj_bucket[i].list) {
if (lh) {
obj = ylist_entry(lh, yaffs_obj_t, hash_link);
yaffs_verify_obj(obj);
}
}
}
}
void yaffs_verify_obj_in_dir(yaffs_obj_t *obj)
{
struct ylist_head *lh;
yaffs_obj_t *listObj;
int count = 0;
if (!obj) {
T(YAFFS_TRACE_ALWAYS, (TSTR("No object to verify" TENDSTR)));
YBUG();
return;
}
if (yaffs_skip_verification(obj->my_dev))
return;
if (!obj->parent) {
T(YAFFS_TRACE_ALWAYS, (TSTR("Object does not have parent" TENDSTR)));
YBUG();
return;
}
if (obj->parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
T(YAFFS_TRACE_ALWAYS, (TSTR("Parent is not directory" TENDSTR)));
YBUG();
}
/* Iterate through the objects in each hash entry */
ylist_for_each(lh, &obj->parent->variant.dir_variant.children) {
if (lh) {
listObj = ylist_entry(lh, yaffs_obj_t, siblings);
yaffs_verify_obj(listObj);
if (obj == listObj)
count++;
}
}
if (count != 1) {
T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory %d times" TENDSTR), count));
YBUG();
}
}
void yaffs_verify_dir(yaffs_obj_t *directory)
{
struct ylist_head *lh;
yaffs_obj_t *listObj;
if (!directory) {
YBUG();
return;
}
if (yaffs_skip_full_verification(directory->my_dev))
return;
if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
T(YAFFS_TRACE_ALWAYS, (TSTR("Directory has wrong type: %d" TENDSTR), directory->variant_type));
YBUG();
}
/* Iterate through the objects in each hash entry */
ylist_for_each(lh, &directory->variant.dir_variant.children) {
if (lh) {
listObj = ylist_entry(lh, yaffs_obj_t, siblings);
if (listObj->parent != directory) {
T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory list has wrong parent %p" TENDSTR), listObj->parent));
YBUG();
}
yaffs_verify_obj_in_dir(listObj);
}
}
}
static int yaffs_free_verification_failures;
void yaffs_verify_free_chunks(yaffs_dev_t *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) {
T(YAFFS_TRACE_ALWAYS,
(TSTR("Freechunks verification failure %d %d %d" TENDSTR),
dev->n_free_chunks, counted, difference));
yaffs_free_verification_failures++;
}
}
int yaffs_verify_file_sane(yaffs_obj_t *in)
{
#if 0
int chunk;
int n_chunks;
int fSize;
int failed = 0;
int obj_id;
yaffs_tnode_t *tn;
yaffs_tags_t localTags;
yaffs_tags_t *tags = &localTags;
int theChunk;
int is_deleted;
if (in->variant_type != YAFFS_OBJECT_TYPE_FILE)
return YAFFS_FAIL;
obj_id = in->obj_id;
fSize = in->variant.file_variant.file_size;
n_chunks =
(fSize + in->my_dev->data_bytes_per_chunk - 1) / in->my_dev->data_bytes_per_chunk;
for (chunk = 1; chunk <= n_chunks; chunk++) {
tn = yaffs_find_tnode_0(in->my_dev, &in->variant.file_variant,
chunk);
if (tn) {
theChunk = yaffs_get_group_base(dev, tn, chunk);
if (yaffs_check_chunk_bits
(dev, theChunk / dev->param.chunks_per_block,
theChunk % dev->param.chunks_per_block)) {
yaffs_rd_chunk_tags_nand(in->my_dev, theChunk,
tags,
&is_deleted);
if (yaffs_tags_match
(tags, in->obj_id, chunk, is_deleted)) {
/* found it; */
}
} else {
failed = 1;
}
} else {
/* T(("No level 0 found for %d\n", chunk)); */
}
}
return failed ? YAFFS_FAIL : YAFFS_OK;
#else
in=in;
return YAFFS_OK;
#endif
}