diff options
Diffstat (limited to 'cmds-check.c')
| -rw-r--r-- | cmds-check.c | 1571 |
1 files changed, 1557 insertions, 14 deletions
diff --git a/cmds-check.c b/cmds-check.c index fbeb3a4a..0ddfd24a 100644 --- a/cmds-check.c +++ b/cmds-check.c @@ -74,6 +74,15 @@ static struct btrfs_fs_info *global_info; static struct task_ctx ctx = { 0 }; static struct cache_tree *roots_info_cache = NULL; +enum btrfs_check_mode { + CHECK_MODE_ORIGINAL, + CHECK_MODE_LOWMEM, + CHECK_MODE_UNKNOWN, + CHECK_MODE_DEFAULT = CHECK_MODE_ORIGINAL +}; + +static enum btrfs_check_mode check_mode = CHECK_MODE_DEFAULT; + struct extent_backref { struct rb_node node; unsigned int is_data:1; @@ -434,6 +443,23 @@ struct root_item_info { struct cache_extent cache_extent; }; +/* + * Error bit for low memory mode check. + * + * Currently no caller cares about it yet. Just internal use for error + * classification. + */ +#define BACKREF_MISSING (1 << 0) /* Backref missing in extent tree */ +#define BACKREF_MISMATCH (1 << 1) /* Backref exists but does not match */ +#define BYTES_UNALIGNED (1 << 2) /* Some bytes are not aligned */ +#define REFERENCER_MISSING (1 << 3) /* Referencer not found */ +#define REFERENCER_MISMATCH (1 << 4) /* Referenceer found but does not match */ +#define CROSSING_STRIPE_BOUNDARY (1 << 4) /* For kernel scrub workaround */ +#define ITEM_SIZE_MISMATCH (1 << 5) /* Bad item size */ +#define UNKNOWN_TYPE (1 << 6) /* Unknown type */ +#define ACCOUNTING_MISMATCH (1 << 7) /* Used space accounting error */ +#define CHUNK_TYPE_MISMATCH (1 << 8) + static void *print_status_check(void *p) { struct task_ctx *priv = p; @@ -468,6 +494,18 @@ static int print_status_return(void *p) return 0; } +static enum btrfs_check_mode parse_check_mode(const char *str) +{ + if (strcmp(str, "lowmem") == 0) + return CHECK_MODE_LOWMEM; + if (strcmp(str, "orig") == 0) + return CHECK_MODE_ORIGINAL; + if (strcmp(str, "original") == 0) + return CHECK_MODE_ORIGINAL; + + return CHECK_MODE_UNKNOWN; +} + /* Compatible function to allow reuse of old codes */ static u64 first_extent_gap(struct rb_root *holes) { @@ -1953,8 +1991,14 @@ static int check_child_node(struct btrfs_root *root, return ret; } +struct node_refs { + u64 bytenr[BTRFS_MAX_LEVEL]; + u64 refs[BTRFS_MAX_LEVEL]; +}; + static int walk_down_tree(struct btrfs_root *root, struct btrfs_path *path, - struct walk_control *wc, int *level) + struct walk_control *wc, int *level, + struct node_refs *nrefs) { enum btrfs_tree_block_status status; u64 bytenr; @@ -1967,12 +2011,20 @@ static int walk_down_tree(struct btrfs_root *root, struct btrfs_path *path, WARN_ON(*level < 0); WARN_ON(*level >= BTRFS_MAX_LEVEL); - ret = btrfs_lookup_extent_info(NULL, root, + + if (path->nodes[*level]->start == nrefs->bytenr[*level]) { + refs = nrefs->refs[*level]; + ret = 0; + } else { + ret = btrfs_lookup_extent_info(NULL, root, path->nodes[*level]->start, *level, 1, &refs, NULL); - if (ret < 0) { - err = ret; - goto out; + if (ret < 0) { + err = ret; + goto out; + } + nrefs->bytenr[*level] = path->nodes[*level]->start; + nrefs->refs[*level] = refs; } if (refs > 1) { @@ -2003,10 +2055,19 @@ static int walk_down_tree(struct btrfs_root *root, struct btrfs_path *path, bytenr = btrfs_node_blockptr(cur, path->slots[*level]); ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]); blocksize = root->nodesize; - ret = btrfs_lookup_extent_info(NULL, root, bytenr, *level - 1, - 1, &refs, NULL); - if (ret < 0) - refs = 0; + + if (bytenr == nrefs->bytenr[*level - 1]) { + refs = nrefs->refs[*level - 1]; + } else { + ret = btrfs_lookup_extent_info(NULL, root, bytenr, + *level - 1, 1, &refs, NULL); + if (ret < 0) { + refs = 0; + } else { + nrefs->bytenr[*level - 1] = bytenr; + nrefs->refs[*level - 1] = refs; + } + } if (refs > 1) { ret = enter_shared_node(root, bytenr, refs, @@ -3619,6 +3680,7 @@ static int check_fs_root(struct btrfs_root *root, struct orphan_data_extent *orphan; struct orphan_data_extent *tmp; enum btrfs_tree_block_status status; + struct node_refs nrefs; /* * Reuse the corrupt_block cache tree to record corrupted tree block @@ -3640,6 +3702,7 @@ static int check_fs_root(struct btrfs_root *root, memset(&root_node, 0, sizeof(root_node)); cache_tree_init(&root_node.root_cache); cache_tree_init(&root_node.inode_cache); + memset(&nrefs, 0, sizeof(nrefs)); /* Move the orphan extent record to corresponding inode_record */ list_for_each_entry_safe(orphan, tmp, @@ -3689,7 +3752,7 @@ static int check_fs_root(struct btrfs_root *root, } while (1) { - wret = walk_down_tree(root, &path, wc, &level); + wret = walk_down_tree(root, &path, wc, &level, &nrefs); if (wret < 0) ret = wret; if (wret != 0) @@ -8514,6 +8577,1459 @@ loop: goto again; } +/* + * Check backrefs of a tree block given by @bytenr or @eb. + * + * @root: the root containing the @bytenr or @eb + * @eb: tree block extent buffer, can be NULL + * @bytenr: bytenr of the tree block to search + * @level: tree level of the tree block + * @owner: owner of the tree block + * + * Return >0 for any error found and output error message + * Return 0 for no error found + */ +static int check_tree_block_ref(struct btrfs_root *root, + struct extent_buffer *eb, u64 bytenr, + int level, u64 owner) +{ + struct btrfs_key key; + struct btrfs_root *extent_root = root->fs_info->extent_root; + struct btrfs_path path; + struct btrfs_extent_item *ei; + struct btrfs_extent_inline_ref *iref; + struct extent_buffer *leaf; + unsigned long end; + unsigned long ptr; + int slot; + int skinny_level; + int type; + u32 nodesize = root->nodesize; + u32 item_size; + u64 offset; + int found_ref = 0; + int err = 0; + int ret; + + btrfs_init_path(&path); + key.objectid = bytenr; + if (btrfs_fs_incompat(root->fs_info, + BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA)) + key.type = BTRFS_METADATA_ITEM_KEY; + else + key.type = BTRFS_EXTENT_ITEM_KEY; + key.offset = (u64)-1; + + /* Search for the backref in extent tree */ + ret = btrfs_search_slot(NULL, extent_root, &key, &path, 0, 0); + if (ret < 0) { + err |= BACKREF_MISSING; + goto out; + } + ret = btrfs_previous_extent_item(extent_root, &path, bytenr); + if (ret) { + err |= BACKREF_MISSING; + goto out; + } + + leaf = path.nodes[0]; + slot = path.slots[0]; + btrfs_item_key_to_cpu(leaf, &key, slot); + + ei = btrfs_item_ptr(leaf, slot, struct btrfs_extent_item); + + if (key.type == BTRFS_METADATA_ITEM_KEY) { + skinny_level = (int)key.offset; + iref = (struct btrfs_extent_inline_ref *)(ei + 1); + } else { + struct btrfs_tree_block_info *info; + + info = (struct btrfs_tree_block_info *)(ei + 1); + skinny_level = btrfs_tree_block_level(leaf, info); + iref = (struct btrfs_extent_inline_ref *)(info + 1); + } + + if (eb) { + u64 header_gen; + u64 extent_gen; + + if (!(btrfs_extent_flags(leaf, ei) & + BTRFS_EXTENT_FLAG_TREE_BLOCK)) { + error( + "extent[%llu %u] backref type mismatch, missing bit: %llx", + key.objectid, nodesize, + BTRFS_EXTENT_FLAG_TREE_BLOCK); + err = BACKREF_MISMATCH; + } + header_gen = btrfs_header_generation(eb); + extent_gen = btrfs_extent_generation(leaf, ei); + if (header_gen != extent_gen) { + error( + "extent[%llu %u] backref generation mismatch, wanted: %llu, have: %llu", + key.objectid, nodesize, header_gen, + extent_gen); + err = BACKREF_MISMATCH; + } + if (level != skinny_level) { + error( + "extent[%llu %u] level mismatch, wanted: %u, have: %u", + key.objectid, nodesize, level, skinny_level); + err = BACKREF_MISMATCH; + } + if (!is_fstree(owner) && btrfs_extent_refs(leaf, ei) != 1) { + error( + "extent[%llu %u] is referred by other roots than %llu", + key.objectid, nodesize, root->objectid); + err = BACKREF_MISMATCH; + } + } + + /* + * Iterate the extent/metadata item to find the exact backref + */ + item_size = btrfs_item_size_nr(leaf, slot); + ptr = (unsigned long)iref; + end = (unsigned long)ei + item_size; + while (ptr < end) { + iref = (struct btrfs_extent_inline_ref *)ptr; + type = btrfs_extent_inline_ref_type(leaf, iref); + offset = btrfs_extent_inline_ref_offset(leaf, iref); + + if (type == BTRFS_TREE_BLOCK_REF_KEY && + (offset == root->objectid || offset == owner)) { + found_ref = 1; + } else if (type == BTRFS_SHARED_BLOCK_REF_KEY) { + /* Check if the backref points to valid referencer */ + found_ref = !check_tree_block_ref(root, NULL, offset, + level + 1, owner); + } + + if (found_ref) + break; + ptr += btrfs_extent_inline_ref_size(type); + } + + /* + * Inlined extent item doesn't have what we need, check + * TREE_BLOCK_REF_KEY + */ + if (!found_ref) { + btrfs_release_path(&path); + key.objectid = bytenr; + key.type = BTRFS_TREE_BLOCK_REF_KEY; + key.offset = root->objectid; + + ret = btrfs_search_slot(NULL, extent_root, &key, &path, 0, 0); + if (!ret) + found_ref = 1; + } + if (!found_ref) + err |= BACKREF_MISSING; +out: + btrfs_release_path(&path); + if (eb && (err & BACKREF_MISSING)) + error("extent[%llu %u] backref lost (owner: %llu, level: %u)", + bytenr, nodesize, owner, level); + return err; +} + +/* + * Check EXTENT_DATA item, mainly for its dbackref in extent tree + * + * Return >0 any error found and output error message + * Return 0 for no error found + */ +static int check_extent_data_item(struct btrfs_root *root, + struct extent_buffer *eb, int slot) +{ + struct btrfs_file_extent_item *fi; + struct btrfs_path path; + struct btrfs_root *extent_root = root->fs_info->extent_root; + struct btrfs_key fi_key; + struct btrfs_key dbref_key; + struct extent_buffer *leaf; + struct btrfs_extent_item *ei; + struct btrfs_extent_inline_ref *iref; + struct btrfs_extent_data_ref *dref; + u64 owner; + u64 file_extent_gen; + u64 disk_bytenr; + u64 disk_num_bytes; + u64 extent_num_bytes; + u64 extent_flags; + u64 extent_gen; + u32 item_size; + unsigned long end; + unsigned long ptr; + int type; + u64 ref_root; + int found_dbackref = 0; + int err = 0; + int ret; + + btrfs_item_key_to_cpu(eb, &fi_key, slot); + fi = btrfs_item_ptr(eb, slot, struct btrfs_file_extent_item); + file_extent_gen = btrfs_file_extent_generation(eb, fi); + + /* Nothing to check for hole and inline data extents */ + if (btrfs_file_extent_type(eb, fi) == BTRFS_FILE_EXTENT_INLINE || + btrfs_file_extent_disk_bytenr(eb, fi) == 0) + return 0; + + disk_bytenr = btrfs_file_extent_disk_bytenr(eb, fi); + disk_num_bytes = btrfs_file_extent_disk_num_bytes(eb, fi); + extent_num_bytes = btrfs_file_extent_num_bytes(eb, fi); + + /* Check unaligned disk_num_bytes and num_bytes */ + if (!IS_ALIGNED(disk_num_bytes, root->sectorsize)) { + error( +"file extent [%llu, %llu] has unaligned disk num bytes: %llu, should be aligned to %u", + fi_key.objectid, fi_key.offset, disk_num_bytes, + root->sectorsize); + err |= BYTES_UNALIGNED; + } else { + data_bytes_allocated += disk_num_bytes; + } + if (!IS_ALIGNED(extent_num_bytes, root->sectorsize)) { + error( +"file extent [%llu, %llu] has unaligned num bytes: %llu, should be aligned to %u", + fi_key.objectid, fi_key.offset, extent_num_bytes, + root->sectorsize); + err |= BYTES_UNALIGNED; + } else { + data_bytes_referenced += extent_num_bytes; + } + owner = btrfs_header_owner(eb); + + /* Check the extent item of the file extent in extent tree */ + btrfs_init_path(&path); + dbref_key.objectid = btrfs_file_extent_disk_bytenr(eb, fi); + dbref_key.type = BTRFS_EXTENT_ITEM_KEY; + dbref_key.offset = btrfs_file_extent_disk_num_bytes(eb, fi); + + ret = btrfs_search_slot(NULL, extent_root, &dbref_key, &path, 0, 0); + if (ret) { + err |= BACKREF_MISSING; + goto error; + } + + leaf = path.nodes[0]; + slot = path.slots[0]; + ei = btrfs_item_ptr(leaf, slot, struct btrfs_extent_item); + + extent_flags = btrfs_extent_flags(leaf, ei); + extent_gen = btrfs_extent_generation(leaf, ei); + + if (!(extent_flags & BTRFS_EXTENT_FLAG_DATA)) { + error( + "extent[%llu %llu] backref type mismatch, wanted bit: %llx", + disk_bytenr, disk_num_bytes, + BTRFS_EXTENT_FLAG_DATA); + err |= BACKREF_MISMATCH; + } + + if (file_extent_gen < extent_gen) { + error( +"extent[%llu %llu] backref generation mismatch, wanted: <=%llu, have: %llu", + disk_bytenr, disk_num_bytes, file_extent_gen, + extent_gen); + err |= BACKREF_MISMATCH; + } + + /* Check data backref inside that extent item */ + item_size = btrfs_item_size_nr(leaf, path.slots[0]); + iref = (struct btrfs_extent_inline_ref *)(ei + 1); + ptr = (unsigned long)iref; + end = (unsigned long)ei + item_size; + while (ptr < end) { + iref = (struct btrfs_extent_inline_ref *)ptr; + type = btrfs_extent_inline_ref_type(leaf, iref); + dref = (struct btrfs_extent_data_ref *)(&iref->offset); + + if (type == BTRFS_EXTENT_DATA_REF_KEY) { + ref_root = btrfs_extent_data_ref_root(leaf, dref); + if (ref_root == owner || ref_root == root->objectid) + found_dbackref = 1; + } else if (type == BTRFS_SHARED_DATA_REF_KEY) { + found_dbackref = !check_tree_block_ref(root, NULL, + btrfs_extent_inline_ref_offset(leaf, iref), + 0, owner); + } + + if (found_dbackref) + break; + ptr += btrfs_extent_inline_ref_size(type); + } + + /* Didn't found inlined data backref, try EXTENT_DATA_REF_KEY */ + if (!found_dbackref) { + btrfs_release_path(&path); + + btrfs_init_path(&path); + dbref_key.objectid = btrfs_file_extent_disk_bytenr(eb, fi); + dbref_key.type = BTRFS_EXTENT_DATA_REF_KEY; + dbref_key.offset = hash_extent_data_ref(root->objectid, + fi_key.objectid, fi_key.offset); + + ret = btrfs_search_slot(NULL, root->fs_info->extent_root, + &dbref_key, &path, 0, 0); + if (!ret) + found_dbackref = 1; + } + + if (!found_dbackref) + err |= BACKREF_MISSING; +error: + btrfs_release_path(&path); + if (err & BACKREF_MISSING) { + error("data extent[%llu %llu] backref lost", + disk_bytenr, disk_num_bytes); + } + return err; +} + +/* + * Get real tree block level for the case like shared block + * Return >= 0 as tree level + * Return <0 for error + */ +static int query_tree_block_level(struct btrfs_fs_info *fs_info, u64 bytenr) +{ + struct extent_buffer *eb; + struct btrfs_path path; + struct btrfs_key key; + struct btrfs_extent_item *ei; + u64 flags; + u64 transid; + u32 nodesize = btrfs_super_nodesize(fs_info->super_copy); + u8 backref_level; + u8 header_level; + int ret; + + /* Search extent tree for extent generation and level */ + key.objectid = bytenr; + key.type = BTRFS_METADATA_ITEM_KEY; + key.offset = (u64)-1; + + btrfs_init_path(&path); + ret = btrfs_search_slot(NULL, fs_info->extent_root, &key, &path, 0, 0); + if (ret < 0) + goto release_out; + ret = btrfs_previous_extent_item(fs_info->extent_root, &path, bytenr); + if (ret < 0) + goto release_out; + if (ret > 0) { + ret = -ENOENT; + goto release_out; + } + + btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); + ei = btrfs_item_ptr(path.nodes[0], path.slots[0], + struct btrfs_extent_item); + flags = btrfs_extent_flags(path.nodes[0], ei); + if (!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) { + ret = -ENOENT; + goto release_out; + } + + /* Get transid for later read_tree_block() check */ + transid = btrfs_extent_generation(path.nodes[0], ei); + + /* Get backref level as one source */ + if (key.type == BTRFS_METADATA_ITEM_KEY) { + backref_level = key.offset; + } else { + struct btrfs_tree_block_info *info; + + info = (struct btrfs_tree_block_info *)(ei + 1); + backref_level = btrfs_tree_block_level(path.nodes[0], info); + } + btrfs_release_path(&path); + + /* Get level from tree block as an alternative source */ + eb = read_tree_block_fs_info(fs_info, bytenr, nodesize, transid); + if (!extent_buffer_uptodate(eb)) { + free_extent_buffer(eb); + return -EIO; + } + header_level = btrfs_header_level(eb); + free_extent_buffer(eb); + + if (header_level != backref_level) + return -EIO; + return header_level; + +release_out: + btrfs_release_path(&path); + return ret; +} + +/* + * Check if a tree block backref is valid (points to a valid tree block) + * if level == -1, level will be resolved + * Return >0 for any error found and print error message + */ +static int check_tree_block_backref(struct btrfs_fs_info *fs_info, u64 root_id, + u64 bytenr, int level) +{ + struct btrfs_root *root; + struct btrfs_key key; + struct btrfs_path path; + struct extent_buffer *eb; + struct extent_buffer *node; + u32 nodesize = btrfs_super_nodesize(fs_info->super_copy); + int err = 0; + int ret; + + /* Query level for level == -1 special case */ + if (level == -1) + level = query_tree_block_level(fs_info, bytenr); + if (level < 0) { + err |= REFERENCER_MISSING; + goto out; + } + + key.objectid = root_id; + key.type = BTRFS_ROOT_ITEM_KEY; + key.offset = (u64)-1; + + root = btrfs_read_fs_root(fs_info, &key); + if (IS_ERR(root)) { + err |= REFERENCER_MISSING; + goto out; + } + + /* Read out the tree block to get item/node key */ + eb = read_tree_block(root, bytenr, root->nodesize, 0); + if (!extent_buffer_uptodate(eb)) { + err |= REFERENCER_MISSING; + free_extent_buffer(eb); + goto out; + } + + /* Empty tree, no need to check key */ + if (!btrfs_header_nritems(eb) && !level) { + free_extent_buffer(eb); + goto out; + } + + if (level) + btrfs_node_key_to_cpu(eb, &key, 0); + else + btrfs_item_key_to_cpu(eb, &key, 0); + + free_extent_buffer(eb); + + btrfs_init_path(&path); + /* Search with the first key, to ensure we can reach it */ + ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0); + if (ret) { + err |= REFERENCER_MISSING; + goto release_out; + } + + node = path.nodes[level]; + if (btrfs_header_bytenr(node) != bytenr) { + error( + "extent [%llu %d] referencer bytenr mismatch, wanted: %llu, have: %llu", + bytenr, nodesize, bytenr, + btrfs_header_bytenr(node)); + err |= REFERENCER_MISMATCH; + } + if (btrfs_header_level(node) != level) { + error( + "extent [%llu %d] referencer level mismatch, wanted: %d, have: %d", + bytenr, nodesize, level, + btrfs_header_level(node)); + err |= REFERENCER_MISMATCH; + } + +release_out: + btrfs_release_path(&path); +out: + if (err & REFERENCER_MISSING) { + if (level < 0) + error("extent [%llu %d] lost referencer (owner: %llu)", + bytenr, nodesize, root_id); + else + error( + "extent [%llu %d] lost referencer (owner: %llu, level: %u)", + bytenr, nodesize, root_id, level); + } + + return err; +} + +/* + * Check referencer for shared block backref + * If level == -1, this function will resolve the level. + */ +static int check_shared_block_backref(struct btrfs_fs_info *fs_info, + u64 parent, u64 bytenr, int level) +{ + struct extent_buffer *eb; + u32 nodesize = btrfs_super_nodesize(fs_info->super_copy); + u32 nr; + int found_parent = 0; + int i; + + eb = read_tree_block_fs_info(fs_info, parent, nodesize, 0); + if (!extent_buffer_uptodate(eb)) + goto out; + + if (level == -1) + level = query_tree_block_level(fs_info, bytenr); + if (level < 0) + goto out; + + if (level + 1 != btrfs_header_level(eb)) + goto out; + + nr = btrfs_header_nritems(eb); + for (i = 0; i < nr; i++) { + if (bytenr == btrfs_node_blockptr(eb, i)) { + found_parent = 1; + break; + } + } +out: + free_extent_buffer(eb); + if (!found_parent) { + error( + "shared extent[%llu %u] lost its parent (parent: %llu, level: %u)", + bytenr, nodesize, parent, level); + return REFERENCER_MISSING; + } + return 0; +} + +/* + * Check referencer for normal (inlined) data ref + * If len == 0, it will be resolved by searching in extent tree + */ +static int check_extent_data_backref(struct btrfs_fs_info *fs_info, + u64 root_id, u64 objectid, u64 offset, + u64 bytenr, u64 len, u32 count) +{ + struct btrfs_root *root; + struct btrfs_root *extent_root = fs_info->extent_root; + struct btrfs_key key; + struct btrfs_path path; + struct extent_buffer *leaf; + struct btrfs_file_extent_item *fi; + u32 found_count = 0; + int slot; + int ret = 0; + + if (!len) { + key.objectid = bytenr; + key.type = BTRFS_EXTENT_ITEM_KEY; + key.offset = (u64)-1; + + btrfs_init_path(&path); + ret = btrfs_search_slot(NULL, extent_root, &key, &path, 0, 0); + if (ret < 0) + goto out; + ret = btrfs_previous_extent_item(extent_root, &path, bytenr); + if (ret) + goto out; + btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); + if (key.objectid != bytenr || + key.type != BTRFS_EXTENT_ITEM_KEY) + goto out; + len = key.offset; + btrfs_release_path(&path); + } + key.objectid = root_id; + btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); + key.offset = (u64)-1; + btrfs_init_path(&path); + + root = btrfs_read_fs_root(fs_info, &key); + if (IS_ERR(root)) + goto out; + + key.objectid = objectid; + key.type = BTRFS_EXTENT_DATA_KEY; + /* + * It can be nasty as data backref offset is + * file offset - file extent offset, which is smaller or + * equal to original backref offset. The only special case is + * overflow. So we need to special check and do further search. + */ + key.offset = offset & (1ULL << 63) ? 0 : offset; + + ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0); + if (ret < 0) + goto out; + + /* + * Search afterwards to get correct one + * NOTE: As we must do a comprehensive check on the data backref to + * make sure the dref count also matches, we must iterate all file + * extents for that inode. + */ + while (1) { + leaf = path.nodes[0]; + slot = path.slots[0]; + + btrfs_item_key_to_cpu(leaf, &key, slot); + if (key.objectid != objectid || key.type != BTRFS_EXTENT_DATA_KEY) + break; + fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); + /* + * Except normal disk bytenr and disk num bytes, we still + * need to do extra check on dbackref offset as + * dbackref offset = file_offset - file_extent_offset + */ + if (btrfs_file_extent_disk_bytenr(leaf, fi) == bytenr && + btrfs_file_extent_disk_num_bytes(leaf, fi) == len && + (u64)(key.offset - btrfs_file_extent_offset(leaf, fi)) == + offset) + found_count++; + + ret = btrfs_next_item(root, &path); + if (ret) + break; + } +out: + btrfs_release_path(&path); + if (found_count != count) { + error( +"extent[%llu, %llu] referencer count mismatch (root: %llu, owner: %llu, offset: %llu) wanted: %u, have: %u", + bytenr, len, root_id, objectid, offset, count, found_count); + return REFERENCER_MISSING; + } + return 0; +} + +/* + * Check if the referencer of a shared data backref exists + */ +static int check_shared_data_backref(struct btrfs_fs_info *fs_info, + u64 parent, u64 bytenr) +{ + struct extent_buffer *eb; + struct btrfs_key key; + struct btrfs_file_extent_item *fi; + u32 nodesize = btrfs_super_nodesize(fs_info->super_copy); + u32 nr; + int found_parent = 0; + int i; + + eb = read_tree_block_fs_info(fs_info, parent, nodesize, 0); + if (!extent_buffer_uptodate(eb)) + goto out; + + nr = btrfs_header_nritems(eb); + for (i = 0; i < nr; i++) { + btrfs_item_key_to_cpu(eb, &key, i); + if (key.type != BTRFS_EXTENT_DATA_KEY) + continue; + + fi = btrfs_item_ptr(eb, i, struct btrfs_file_extent_item); + if (btrfs_file_extent_type(eb, fi) == BTRFS_FILE_EXTENT_INLINE) + continue; + + if (btrfs_file_extent_disk_bytenr(eb, fi) == bytenr) { + found_parent = 1; + break; + } + } + +out: + free_extent_buffer(eb); + if (!found_parent) { + error("shared extent %llu referencer lost (parent: %llu)", + bytenr, parent); + return REFERENCER_MISSING; + } + return 0; +} + +/* + * This function will check a given extent item, including its backref and + * itself (like crossing stripe boundary and type) + * + * Since we don't use extent_record anymore, introduce new error bit + */ +static int check_extent_item(struct btrfs_fs_info *fs_info, + struct extent_buffer *eb, int slot) +{ + struct btrfs_extent_item *ei; + struct btrfs_extent_inline_ref *iref; + struct btrfs_extent_data_ref *dref; + unsigned long end; + unsigned long ptr; + int type; + u32 nodesize = btrfs_super_nodesize(fs_info->super_copy); + u32 item_size = btrfs_item_size_nr(eb, slot); + u64 flags; + u64 offset; + int metadata = 0; + int level; + struct btrfs_key key; + int ret; + int err = 0; + + btrfs_item_key_to_cpu(eb, &key, slot); + if (key.type == BTRFS_EXTENT_ITEM_KEY) + bytes_used += key.offset; + else + bytes_used += nodesize; + + if (item_size < sizeof(*ei)) { + /* + * COMPAT_EXTENT_TREE_V0 case, but it's already a super + * old thing when on disk format is still un-determined. + * No need to care about it anymore + */ + error("unsupported COMPAT_EXTENT_TREE_V0 detected"); + return -ENOTTY; + } + + ei = btrfs_item_ptr(eb, slot, struct btrfs_extent_item); + flags = btrfs_extent_flags(eb, ei); + + if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) + metadata = 1; + if (metadata && check_crossing_stripes(key.objectid, eb->len)) { + error("bad metadata [%llu, %llu) crossing stripe boundary", + key.objectid, key.objectid + nodesize); + err |= CROSSING_STRIPE_BOUNDARY; + } + + ptr = (unsigned long)(ei + 1); + + if (metadata && key.type == BTRFS_EXTENT_ITEM_KEY) { + /* Old EXTENT_ITEM metadata */ + struct btrfs_tree_block_info *info; + + info = (struct btrfs_tree_block_info *)ptr; + level = btrfs_tree_block_level(eb, info); + ptr += sizeof(struct btrfs_tree_block_info); + } else { + /* New METADATA_ITEM */ + level = key.offset; + } + end = (unsigned long)ei + item_size; + + if (ptr >= end) { + err |= ITEM_SIZE_MISMATCH; + goto out; + } + + /* Now check every backref in this extent item */ +next: + iref = (struct btrfs_extent_inline_ref *)ptr; + type = btrfs_extent_inline_ref_type(eb, iref); + offset = btrfs_extent_inline_ref_offset(eb, iref); + switch (type) { + case BTRFS_TREE_BLOCK_REF_KEY: + ret = check_tree_block_backref(fs_info, offset, key.objectid, + level); + err |= ret; + break; + case BTRFS_SHARED_BLOCK_REF_KEY: + ret = check_shared_block_backref(fs_info, offset, key.objectid, + level); + err |= ret; + break; + case BTRFS_EXTENT_DATA_REF_KEY: + dref = (struct btrfs_extent_data_ref *)(&iref->offset); + ret = check_extent_data_backref(fs_info, + btrfs_extent_data_ref_root(eb, dref), + btrfs_extent_data_ref_objectid(eb, dref), + btrfs_extent_data_ref_offset(eb, dref), + key.objectid, key.offset, + btrfs_extent_data_ref_count(eb, dref)); + err |= ret; + break; + case BTRFS_SHARED_DATA_REF_KEY: + ret = check_shared_data_backref(fs_info, offset, key.objectid); + err |= ret; + break; + default: + error("extent[%llu %d %llu] has unknown ref type: %d", + key.objectid, key.type, key.offset, type); + err |= UNKNOWN_TYPE; + goto out; + } + + ptr += btrfs_extent_inline_ref_size(type); + if (ptr < end) + goto next; + +out: + return err; +} + +/* + * Check if a dev extent item is referred correctly by its chunk + */ +static int check_dev_extent_item(struct btrfs_fs_info *fs_info, + struct extent_buffer *eb, int slot) +{ + struct btrfs_root *chunk_root = fs_info->chunk_root; + struct btrfs_dev_extent *ptr; + struct btrfs_path path; + struct btrfs_key chunk_key; + struct btrfs_key devext_key; + struct btrfs_chunk *chunk; + struct extent_buffer *l; + int num_stripes; + u64 length; + int i; + int found_chunk = 0; + int ret; + + btrfs_item_key_to_cpu(eb, &devext_key, slot); + ptr = btrfs_item_ptr(eb, slot, struct btrfs_dev_extent); + length = btrfs_dev_extent_length(eb, ptr); + + chunk_key.objectid = btrfs_dev_extent_chunk_objectid(eb, ptr); + chunk_key.type = BTRFS_CHUNK_ITEM_KEY; + chunk_key.offset = btrfs_dev_extent_chunk_offset(eb, ptr); + + btrfs_init_path(&path); + ret = btrfs_search_slot(NULL, chunk_root, &chunk_key, &path, 0, 0); + if (ret) + goto out; + + l = path.nodes[0]; + chunk = btrfs_item_ptr(l, path.slots[0], struct btrfs_chunk); + if (btrfs_chunk_length(l, chunk) != length) + goto out; + + num_stripes = btrfs_chunk_num_stripes(l, chunk); + for (i = 0; i < num_stripes; i++) { + u64 devid = btrfs_stripe_devid_nr(l, chunk, i); + u64 offset = btrfs_stripe_offset_nr(l, chunk, i); + + if (devid == devext_key.objectid && + offset == devext_key.offset) { + found_chunk = 1; + break; + } + } +out: + btrfs_release_path(&path); + if (!found_chunk) { + error( + "device extent[%llu, %llu, %llu] did not find the related chunk", + devext_key.objectid, devext_key.offset, length); + return REFERENCER_MISSING; + } + return 0; +} + +/* + * Check if the used space is correct with the dev item + */ +static int check_dev_item(struct btrfs_fs_info *fs_info, + struct extent_buffer *eb, int slot) +{ + struct btrfs_root *dev_root = fs_info->dev_root; + struct btrfs_dev_item *dev_item; + struct btrfs_path path; + struct btrfs_key key; + struct btrfs_dev_extent *ptr; + u64 dev_id; + u64 used; + u64 total = 0; + int ret; + + dev_item = btrfs_item_ptr(eb, slot, struct btrfs_dev_item); + dev_id = btrfs_device_id(eb, dev_item); + used = btrfs_device_bytes_used(eb, dev_item); + + key.objectid = dev_id; + key.type = BTRFS_DEV_EXTENT_KEY; + key.offset = 0; + + btrfs_init_path(&path); + ret = btrfs_search_slot(NULL, dev_root, &key, &path, 0, 0); + if (ret < 0) { + btrfs_item_key_to_cpu(eb, &key, slot); + error("cannot find any related dev extent for dev[%llu, %u, %llu]", + key.objectid, key.type, key.offset); + btrfs_release_path(&path); + return REFERENCER_MISSING; + } + + /* Iterate dev_extents to calculate the used space of a device */ + while (1) { + btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); + + if (key.objectid > dev_id) + break; + if (key.type != BTRFS_DEV_EXTENT_KEY || key.objectid != dev_id) + goto next; + + ptr = btrfs_item_ptr(path.nodes[0], path.slots[0], + struct btrfs_dev_extent); + total += btrfs_dev_extent_length(path.nodes[0], ptr); +next: + ret = btrfs_next_item(dev_root, &path); + if (ret) + break; + } + btrfs_release_path(&path); + + if (used != total) { + btrfs_item_key_to_cpu(eb, &key, slot); + error( +"Dev extent's total-byte %llu is not equal to bytes-used %llu in dev[%llu, %u, %llu]", + total, used, BTRFS_ROOT_TREE_OBJECTID, + BTRFS_DEV_EXTENT_KEY, dev_id); + return ACCOUNTING_MISMATCH; + } + return 0; +} + +/* + * Check a block group item with its referener (chunk) and its used space + * with extent/metadata item + */ +static int check_block_group_item(struct btrfs_fs_info *fs_info, + struct extent_buffer *eb, int slot) +{ + struct btrfs_root *extent_root = fs_info->extent_root; + struct btrfs_root *chunk_root = fs_info->chunk_root; + struct btrfs_block_group_item *bi; + struct btrfs_block_group_item bg_item; + struct btrfs_path path; + struct btrfs_key bg_key; + struct btrfs_key chunk_key; + struct btrfs_key extent_key; + struct btrfs_chunk *chunk; + struct extent_buffer *leaf; + struct btrfs_extent_item *ei; + u32 nodesize = btrfs_super_nodesize(fs_info->super_copy); + u64 flags; + u64 bg_flags; + u64 used; + u64 total = 0; + int ret; + int err = 0; + + btrfs_item_key_to_cpu(eb, &bg_key, slot); + bi = btrfs_item_ptr(eb, slot, struct btrfs_block_group_item); + read_extent_buffer(eb, &bg_item, (unsigned long)bi, sizeof(bg_item)); + used = btrfs_block_group_used(&bg_item); + bg_flags = btrfs_block_group_flags(&bg_item); + + chunk_key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; + chunk_key.type = BTRFS_CHUNK_ITEM_KEY; + chunk_key.offset = bg_key.objectid; + + btrfs_init_path(&path); + /* Search for the referencer chunk */ + ret = btrfs_search_slot(NULL, chunk_root, &chunk_key, &path, 0, 0); + if (ret) { + error( + "block group[%llu %llu] did not find the related chunk item", + bg_key.objectid, bg_key.offset); + err |= REFERENCER_MISSING; + } else { + chunk = btrfs_item_ptr(path.nodes[0], path.slots[0], + struct btrfs_chunk); + if (btrfs_chunk_length(path.nodes[0], chunk) != + bg_key.offset) { + error( + "block group[%llu %llu] related chunk item length does not match", + bg_key.objectid, bg_key.offset); + err |= REFERENCER_MISMATCH; + } + } + btrfs_release_path(&path); + + /* Search from the block group bytenr */ + extent_key.objectid = bg_key.objectid; + extent_key.type = 0; + extent_key.offset = 0; + + btrfs_init_path(&path); + ret = btrfs_search_slot(NULL, extent_root, &extent_key, &path, 0, 0); + if (ret < 0) + goto out; + + /* Iterate extent tree to account used space */ + while (1) { + leaf = path.nodes[0]; + btrfs_item_key_to_cpu(leaf, &extent_key, path.slots[0]); + if (extent_key.objectid >= bg_key.objectid + bg_key.offset) + break; + + if (extent_key.type != BTRFS_METADATA_ITEM_KEY && + extent_key.type != BTRFS_EXTENT_ITEM_KEY) + goto next; + if (extent_key.objectid < bg_key.objectid) + goto next; + + if (extent_key.type == BTRFS_METADATA_ITEM_KEY) + total += nodesize; + else + total += extent_key.offset; + + ei = btrfs_item_ptr(leaf, path.slots[0], + struct btrfs_extent_item); + flags = btrfs_extent_flags(leaf, ei); + if (flags & BTRFS_EXTENT_FLAG_DATA) { + if (!(bg_flags & BTRFS_BLOCK_GROUP_DATA)) { + error( + "bad extent[%llu, %llu) type mismatch with chunk", + extent_key.objectid, + extent_key.objectid + extent_key.offset); + err |= CHUNK_TYPE_MISMATCH; + } + } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { + if (!(bg_flags & (BTRFS_BLOCK_GROUP_SYSTEM | + BTRFS_BLOCK_GROUP_METADATA))) { + error( + "bad extent[%llu, %llu) type mismatch with chunk", + extent_key.objectid, + extent_key.objectid + nodesize); + err |= CHUNK_TYPE_MISMATCH; + } + } +next: + ret = btrfs_next_item(extent_root, &path); + if (ret) + break; + } + +out: + btrfs_release_path(&path); + + if (total != used) { + error( + "block group[%llu %llu] used %llu but extent items used %llu", + bg_key.objectid, bg_key.offset, used, total); + err |= ACCOUNTING_MISMATCH; + } + return err; +} + +/* + * Check a chunk item. + * Including checking all referred dev_extents and block group + */ +static int check_chunk_item(struct btrfs_fs_info *fs_info, + struct extent_buffer *eb, int slot) +{ + struct btrfs_root *extent_root = fs_info->extent_root; + struct btrfs_root *dev_root = fs_info->dev_root; + struct btrfs_path path; + struct btrfs_key chunk_key; + struct btrfs_key bg_key; + struct btrfs_key devext_key; + struct btrfs_chunk *chunk; + struct extent_buffer *leaf; + struct btrfs_block_group_item *bi; + struct btrfs_block_group_item bg_item; + struct btrfs_dev_extent *ptr; + u32 sectorsize = btrfs_super_sectorsize(fs_info->super_copy); + u64 length; + u64 chunk_end; + u64 type; + u64 profile; + int num_stripes; + u64 offset; + u64 objectid; + int i; + int ret; + int err = 0; + + btrfs_item_key_to_cpu(eb, &chunk_key, slot); + chunk = btrfs_item_ptr(eb, slot, struct btrfs_chunk); + length = btrfs_chunk_length(eb, chunk); + chunk_end = chunk_key.offset + length; + if (!IS_ALIGNED(length, sectorsize)) { + error("chunk[%llu %llu) not aligned to %u", + chunk_key.offset, chunk_end, sectorsize); + err |= BYTES_UNALIGNED; + goto out; + } + + type = btrfs_chunk_type(eb, chunk); + profile = type & BTRFS_BLOCK_GROUP_PROFILE_MASK; + if (!(type & BTRFS_BLOCK_GROUP_TYPE_MASK)) { + error("chunk[%llu %llu) has no chunk type", + chunk_key.offset, chunk_end); + err |= UNKNOWN_TYPE; + } + if (profile && (profile & (profile - 1))) { + error("chunk[%llu %llu) multiple profiles detected: %llx", + chunk_key.offset, chunk_end, profile); + err |= UNKNOWN_TYPE; + } + + bg_key.objectid = chunk_key.offset; + bg_key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; + bg_key.offset = length; + + btrfs_init_path(&path); + ret = btrfs_search_slot(NULL, extent_root, &bg_key, &path, 0, 0); + if (ret) { + error( + "chunk[%llu %llu) did not find the related block group item", + chunk_key.offset, chunk_end); + err |= REFERENCER_MISSING; + } else{ + leaf = path.nodes[0]; + bi = btrfs_item_ptr(leaf, path.slots[0], + struct btrfs_block_group_item); + read_extent_buffer(leaf, &bg_item, (unsigned long)bi, + sizeof(bg_item)); + if (btrfs_block_group_flags(&bg_item) != type) { + error( +"chunk[%llu %llu) related block group item flags mismatch, wanted: %llu, have: %llu", + chunk_key.offset, chunk_end, type, + btrfs_block_group_flags(&bg_item)); + err |= REFERENCER_MISSING; + } + } + + num_stripes = btrfs_chunk_num_stripes(eb, chunk); + for (i = 0; i < num_stripes; i++) { + btrfs_release_path(&path); + btrfs_init_path(&path); + devext_key.objectid = btrfs_stripe_devid_nr(eb, chunk, i); + devext_key.type = BTRFS_DEV_EXTENT_KEY; + devext_key.offset = btrfs_stripe_offset_nr(eb, chunk, i); + + ret = btrfs_search_slot(NULL, dev_root, &devext_key, &path, + 0, 0); + if (ret) + goto not_match_dev; + + leaf = path.nodes[0]; + ptr = btrfs_item_ptr(leaf, path.slots[0], + struct btrfs_dev_extent); + objectid = btrfs_dev_extent_chunk_objectid(leaf, ptr); + offset = btrfs_dev_extent_chunk_offset(leaf, ptr); + if (objectid != chunk_key.objectid || + offset != chunk_key.offset || + btrfs_dev_extent_length(leaf, ptr) != length) + goto not_match_dev; + continue; +not_match_dev: + err |= BACKREF_MISSING; + error( + "chunk[%llu %llu) stripe %d did not find the related dev extent", + chunk_key.objectid, chunk_end, i); + continue; + } + btrfs_release_path(&path); +out: + return err; +} + +/* + * Main entry function to check known items and update related accounting info + */ +static int check_leaf_items(struct btrfs_root *root, struct extent_buffer *eb) +{ + struct btrfs_fs_info *fs_info = root->fs_info; + struct btrfs_key key; + int slot = 0; + int type; + struct btrfs_extent_data_ref *dref; + int ret; + int err = 0; + +next: + btrfs_item_key_to_cpu(eb, &key, slot); + type = btrfs_key_type(&key); + + switch (type) { + case BTRFS_EXTENT_DATA_KEY: + ret = check_extent_data_item(root, eb, slot); + err |= ret; + break; + case BTRFS_BLOCK_GROUP_ITEM_KEY: + ret = check_block_group_item(fs_info, eb, slot); + err |= ret; + break; + case BTRFS_DEV_ITEM_KEY: + ret = check_dev_item(fs_info, eb, slot); + err |= ret; + break; + case BTRFS_CHUNK_ITEM_KEY: + ret = check_chunk_item(fs_info, eb, slot); + err |= ret; + break; + case BTRFS_DEV_EXTENT_KEY: + ret = check_dev_extent_item(fs_info, eb, slot); + err |= ret; + break; + case BTRFS_EXTENT_ITEM_KEY: + case BTRFS_METADATA_ITEM_KEY: + ret = check_extent_item(fs_info, eb, slot); + err |= ret; + break; + case BTRFS_EXTENT_CSUM_KEY: + total_csum_bytes += btrfs_item_size_nr(eb, slot); + break; + case BTRFS_TREE_BLOCK_REF_KEY: + ret = check_tree_block_backref(fs_info, key.offset, + key.objectid, -1); + err |= ret; + break; + case BTRFS_EXTENT_DATA_REF_KEY: + dref = btrfs_item_ptr(eb, slot, struct btrfs_extent_data_ref); + ret = check_extent_data_backref(fs_info, + btrfs_extent_data_ref_root(eb, dref), + btrfs_extent_data_ref_objectid(eb, dref), + btrfs_extent_data_ref_offset(eb, dref), + key.objectid, 0, + btrfs_extent_data_ref_count(eb, dref)); + err |= ret; + break; + case BTRFS_SHARED_BLOCK_REF_KEY: + ret = check_shared_block_backref(fs_info, key.offset, + key.objectid, -1); + err |= ret; + break; + case BTRFS_SHARED_DATA_REF_KEY: + ret = check_shared_data_backref(fs_info, key.offset, + key.objectid); + err |= ret; + break; + default: + break; + } + + if (++slot < btrfs_header_nritems(eb)) + goto next; + + return err; +} + +/* + * Helper function for later fs/subvol tree check. To determine if a tree + * block should be checked. + * This function will ensure only the direct referencer with lowest rootid to + * check a fs/subvolume tree block. + * + * Backref check at extent tree would detect errors like missing subvolume + * tree, so we can do aggressive check to reduce duplicated checks. + */ +static int should_check(struct btrfs_root *root, struct extent_buffer *eb) +{ + struct btrfs_root *extent_root = root->fs_info->extent_root; + struct btrfs_key key; + struct btrfs_path path; + struct extent_buffer *leaf; + int slot; + struct btrfs_extent_item *ei; + unsigned long ptr; + unsigned long end; + int type; + u32 item_size; + u64 offset; + struct btrfs_extent_inline_ref *iref; + int ret; + + btrfs_init_path(&path); + key.objectid = btrfs_header_bytenr(eb); + key.type = BTRFS_METADATA_ITEM_KEY; + key.offset = (u64)-1; + + /* + * Any failure in backref resolving means we can't determine + * whom the tree block belongs to. + * So in that case, we need to check that tree block + */ + ret = btrfs_search_slot(NULL, extent_root, &key, &path, 0, 0); + if (ret < 0) + goto need_check; + + ret = btrfs_previous_extent_item(extent_root, &path, + btrfs_header_bytenr(eb)); + if (ret) + goto need_check; + + leaf = path.nodes[0]; + slot = path.slots[0]; + btrfs_item_key_to_cpu(leaf, &key, slot); + ei = btrfs_item_ptr(leaf, slot, struct btrfs_extent_item); + + if (key.type == BTRFS_METADATA_ITEM_KEY) { + iref = (struct btrfs_extent_inline_ref *)(ei + 1); + } else { + struct btrfs_tree_block_info *info; + + info = (struct btrfs_tree_block_info *)(ei + 1); + iref = (struct btrfs_extent_inline_ref *)(info + 1); + } + + item_size = btrfs_item_size_nr(leaf, slot); + ptr = (unsigned long)iref; + end = (unsigned long)ei + item_size; + while (ptr < end) { + iref = (struct btrfs_extent_inline_ref *)ptr; + type = btrfs_extent_inline_ref_type(leaf, iref); + offset = btrfs_extent_inline_ref_offset(leaf, iref); + + /* + * We only check the tree block if current root is + * the lowest referencer of it. + */ + if (type == BTRFS_TREE_BLOCK_REF_KEY && + offset < root->objectid) { + btrfs_release_path(&path); + return 0; + } + + ptr += btrfs_extent_inline_ref_size(type); + } + /* + * Normally we should also check keyed tree block ref, but that may be + * very time consuming. Inlined ref should already make us skip a lot + * of refs now. So skip search keyed tree block ref. + */ + +need_check: + btrfs_release_path(&path); + return 1; +} + +/* + * Traversal function for tree block. We will do: + * 1) Skip shared fs/subvolume tree blocks + * 2) Update related bytes accounting + * 3) Pre-order traversal + */ +static int traverse_tree_block(struct btrfs_root *root, + struct extent_buffer *node) +{ + struct extent_buffer *eb; + int level; + u64 nr; + int i; + int err = 0; + int ret; + + /* + * Skip shared fs/subvolume tree block, in that case they will + * be checked by referencer with lowest rootid + */ + if (is_fstree(root->objectid) && !should_check(root, node)) + return 0; + + /* Update bytes accounting */ + total_btree_bytes += node->len; + if (fs_root_objectid(btrfs_header_owner(node))) + total_fs_tree_bytes += node->len; + if (btrfs_header_owner(node) == BTRFS_EXTENT_TREE_OBJECTID) + total_extent_tree_bytes += node->len; + if (!found_old_backref && + btrfs_header_owner(node) == BTRFS_TREE_RELOC_OBJECTID && + btrfs_header_backref_rev(node) == BTRFS_MIXED_BACKREF_REV && + !btrfs_header_flag(node, BTRFS_HEADER_FLAG_RELOC)) + found_old_backref = 1; + + /* pre-order tranversal, check itself first */ + level = btrfs_header_level(node); + ret = check_tree_block_ref(root, node, btrfs_header_bytenr(node), + btrfs_header_level(node), + btrfs_header_owner(node)); + err |= ret; + if (err) + error( + "check %s failed root %llu bytenr %llu level %d, force continue check", + level ? "node":"leaf", root->objectid, + btrfs_header_bytenr(node), btrfs_header_level(node)); + + if (!level) { + btree_space_waste += btrfs_leaf_free_space(root, node); + ret = check_leaf_items(root, node); + err |= ret; + return err; + } + + nr = btrfs_header_nritems(node); + btree_space_waste += (BTRFS_NODEPTRS_PER_BLOCK(root) - nr) * + sizeof(struct btrfs_key_ptr); + + /* Then check all its children */ + for (i = 0; i < nr; i++) { + u64 blocknr = btrfs_node_blockptr(node, i); + + /* + * As a btrfs tree has most 8 levels (0..7), so it's quite safe + * to call the function itself. + */ + eb = read_tree_block(root, blocknr, root->nodesize, 0); + if (extent_buffer_uptodate(eb)) { + ret = traverse_tree_block(root, eb); + err |= ret; + } + free_extent_buffer(eb); + } + + return err; +} + +/* + * Low memory usage version check_chunks_and_extents. + */ +static int check_chunks_and_extents_v2(struct btrfs_root *root) +{ + struct btrfs_path path; + struct btrfs_key key; + struct btrfs_root *root1; + struct btrfs_root *cur_root; + int err = 0; + int ret; + + root1 = root->fs_info->chunk_root; + ret = traverse_tree_block(root1, root1->node); + err |= ret; + + root1 = root->fs_info->tree_root; + ret = traverse_tree_block(root1, root1->node); + err |= ret; + + btrfs_init_path(&path); + key.objectid = BTRFS_EXTENT_TREE_OBJECTID; + key.offset = 0; + key.type = BTRFS_ROOT_ITEM_KEY; + + ret = btrfs_search_slot(NULL, root1, &key, &path, 0, 0); + if (ret) { + error("cannot find extent treet in tree_root"); + goto out; + } + + while (1) { + btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); + if (key.type != BTRFS_ROOT_ITEM_KEY) + goto next; + key.offset = (u64)-1; + + cur_root = btrfs_read_fs_root(root->fs_info, &key); + if (IS_ERR(cur_root) || !cur_root) { + error("failed to read tree: %lld", key.objectid); + goto next; + } + + ret = traverse_tree_block(cur_root, cur_root->node); + err |= ret; + +next: + ret = btrfs_next_item(root1, &path); + if (ret) + goto out; + } + +out: + btrfs_release_path(&path); + return err; +} + static int btrfs_fsck_reinit_root(struct btrfs_trans_handle *trans, struct btrfs_root *root, int overwrite) { @@ -9621,7 +11137,7 @@ const char * const cmd_check_usage[] = { "Check structural integrity of a filesystem (unmounted).", "Check structural integrity of an unmounted filesystem. Verify internal", "trees' consistency and item connectivity. In the repair mode try to", - "fix the problems found.", + "fix the problems found. ", "WARNING: the repair mode is considered dangerous", "", "-s|--super <superblock> use this superblock copy", @@ -9630,6 +11146,12 @@ const char * const cmd_check_usage[] = { "--readonly run in read-only mode (default)", "--init-csum-tree create a new CRC tree", "--init-extent-tree create a new extent tree", + "--mode <MODE> select mode, allows to make some memory/IO", + " trade-offs, where MODE is one of:", + " original - read inodes and extents to memory (requires", + " more memory, does less IO)", + " lowmem - try to use less memory but read blocks again", + " when needed", "--check-data-csum verify checksums of data blocks", "-Q|--qgroup-report print a report on qgroup consistency", "-E|--subvol-extents <subvolid>", @@ -9656,13 +11178,14 @@ int cmd_check(int argc, char **argv) int readonly = 0; int qgroup_report = 0; int qgroups_repaired = 0; - enum btrfs_open_ctree_flags ctree_flags = OPEN_CTREE_EXCLUSIVE; + unsigned ctree_flags = OPEN_CTREE_EXCLUSIVE; while(1) { int c; enum { GETOPT_VAL_REPAIR = 257, GETOPT_VAL_INIT_CSUM, GETOPT_VAL_INIT_EXTENT, GETOPT_VAL_CHECK_CSUM, - GETOPT_VAL_READONLY, GETOPT_VAL_CHUNK_TREE }; + GETOPT_VAL_READONLY, GETOPT_VAL_CHUNK_TREE, + GETOPT_VAL_MODE }; static const struct option long_options[] = { { "super", required_argument, NULL, 's' }, { "repair", no_argument, NULL, GETOPT_VAL_REPAIR }, @@ -9680,6 +11203,8 @@ int cmd_check(int argc, char **argv) { "chunk-root", required_argument, NULL, GETOPT_VAL_CHUNK_TREE }, { "progress", no_argument, NULL, 'p' }, + { "mode", required_argument, NULL, + GETOPT_VAL_MODE }, { NULL, 0, NULL, 0} }; @@ -9744,6 +11269,13 @@ int cmd_check(int argc, char **argv) case GETOPT_VAL_CHECK_CSUM: check_data_csum = 1; break; + case GETOPT_VAL_MODE: + check_mode = parse_check_mode(optarg); + if (check_mode == CHECK_MODE_UNKNOWN) { + error("unknown mode: %s", optarg); + exit(1); + } + break; } } @@ -9761,6 +11293,14 @@ int cmd_check(int argc, char **argv) exit(1); } + /* + * Not supported yet + */ + if (repair && check_mode == CHECK_MODE_LOWMEM) { + error("Low memory mode doesn't support repair yet"); + exit(1); + } + radix_tree_init(); cache_tree_init(&root_cache); @@ -9884,7 +11424,10 @@ int cmd_check(int argc, char **argv) if (!ctx.progress_enabled) fprintf(stderr, "checking extents\n"); - ret = check_chunks_and_extents(root); + if (check_mode == CHECK_MODE_LOWMEM) + ret = check_chunks_and_extents_v2(root); + else + ret = check_chunks_and_extents(root); if (ret) fprintf(stderr, "Errors found in extent allocation tree or chunk allocation\n"); |