From 716ca530e1c4515d8683c9d5be3d56b301758b66 Mon Sep 17 00:00:00 2001 From: James <> Date: Wed, 4 Nov 2015 11:49:21 +0000 Subject: trunk-47381 --- .../linux/generic/files/fs/yaffs2/yaffs_verify.c | 529 +++++++++++++++++++++ 1 file changed, 529 insertions(+) create mode 100644 target/linux/generic/files/fs/yaffs2/yaffs_verify.c (limited to 'target/linux/generic/files/fs/yaffs2/yaffs_verify.c') diff --git a/target/linux/generic/files/fs/yaffs2/yaffs_verify.c b/target/linux/generic/files/fs/yaffs2/yaffs_verify.c new file mode 100644 index 0000000..e8f2f0a --- /dev/null +++ b/target/linux/generic/files/fs/yaffs2/yaffs_verify.c @@ -0,0 +1,529 @@ +/* + * 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 + * + * 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; +} -- cgit v1.2.3