btrfs-progs: check: introduce function to check chunk item
Introduce function check_chunk_item() to check a chunk item. It will check all chunk stripes with dev extents and the corresponding block group item. Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com> Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Reviewed-by: Josef Bacik <jbacik@fb.com> Signed-off-by: David Sterba <dsterba@suse.com>
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cmds-check.c
115
cmds-check.c
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@ -9590,6 +9590,121 @@ out:
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return err;
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}
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/*
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* Check a chunk item.
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* Including checking all referred dev_extents and block group
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*/
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static int check_chunk_item(struct btrfs_fs_info *fs_info,
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struct extent_buffer *eb, int slot)
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{
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struct btrfs_root *extent_root = fs_info->extent_root;
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struct btrfs_root *dev_root = fs_info->dev_root;
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struct btrfs_path path;
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struct btrfs_key chunk_key;
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struct btrfs_key bg_key;
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struct btrfs_key devext_key;
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struct btrfs_chunk *chunk;
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struct extent_buffer *leaf;
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struct btrfs_block_group_item *bi;
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struct btrfs_block_group_item bg_item;
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struct btrfs_dev_extent *ptr;
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u32 sectorsize = btrfs_super_sectorsize(fs_info->super_copy);
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u64 length;
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u64 chunk_end;
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u64 type;
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u64 profile;
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int num_stripes;
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u64 offset;
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u64 objectid;
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int i;
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int ret;
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int err = 0;
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btrfs_item_key_to_cpu(eb, &chunk_key, slot);
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chunk = btrfs_item_ptr(eb, slot, struct btrfs_chunk);
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length = btrfs_chunk_length(eb, chunk);
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chunk_end = chunk_key.offset + length;
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if (!IS_ALIGNED(length, sectorsize)) {
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error("chunk[%llu %llu) not aligned to %u",
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chunk_key.offset, chunk_end, sectorsize);
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err |= BYTES_UNALIGNED;
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goto out;
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}
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type = btrfs_chunk_type(eb, chunk);
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profile = type & BTRFS_BLOCK_GROUP_PROFILE_MASK;
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if (!(type & BTRFS_BLOCK_GROUP_TYPE_MASK)) {
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error("chunk[%llu %llu) has no chunk type",
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chunk_key.offset, chunk_end);
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err |= UNKNOWN_TYPE;
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}
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if (profile && (profile & (profile - 1))) {
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error("chunk[%llu %llu) multiple profiles detected: %llx",
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chunk_key.offset, chunk_end, profile);
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err |= UNKNOWN_TYPE;
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}
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bg_key.objectid = chunk_key.offset;
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bg_key.type = BTRFS_BLOCK_GROUP_ITEM_KEY;
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bg_key.offset = length;
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btrfs_init_path(&path);
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ret = btrfs_search_slot(NULL, extent_root, &bg_key, &path, 0, 0);
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if (ret) {
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error(
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"chunk[%llu %llu) did not find the related block group item",
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chunk_key.offset, chunk_end);
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err |= REFERENCER_MISSING;
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} else{
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leaf = path.nodes[0];
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bi = btrfs_item_ptr(leaf, path.slots[0],
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struct btrfs_block_group_item);
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read_extent_buffer(leaf, &bg_item, (unsigned long)bi,
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sizeof(bg_item));
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if (btrfs_block_group_flags(&bg_item) != type) {
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error(
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"chunk[%llu %llu) related block group item flags mismatch, wanted: %llu, have: %llu",
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chunk_key.offset, chunk_end, type,
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btrfs_block_group_flags(&bg_item));
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err |= REFERENCER_MISSING;
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}
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}
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num_stripes = btrfs_chunk_num_stripes(eb, chunk);
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for (i = 0; i < num_stripes; i++) {
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btrfs_release_path(&path);
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btrfs_init_path(&path);
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devext_key.objectid = btrfs_stripe_devid_nr(eb, chunk, i);
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devext_key.type = BTRFS_DEV_EXTENT_KEY;
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devext_key.offset = btrfs_stripe_offset_nr(eb, chunk, i);
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ret = btrfs_search_slot(NULL, dev_root, &devext_key, &path,
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0, 0);
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if (ret)
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goto not_match_dev;
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leaf = path.nodes[0];
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ptr = btrfs_item_ptr(leaf, path.slots[0],
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struct btrfs_dev_extent);
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objectid = btrfs_dev_extent_chunk_objectid(leaf, ptr);
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offset = btrfs_dev_extent_chunk_offset(leaf, ptr);
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if (objectid != chunk_key.objectid ||
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offset != chunk_key.offset ||
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btrfs_dev_extent_length(leaf, ptr) != length)
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goto not_match_dev;
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continue;
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not_match_dev:
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err |= BACKREF_MISSING;
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error(
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"chunk[%llu %llu) stripe %d did not find the related dev extent",
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chunk_key.objectid, chunk_end, i);
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continue;
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}
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btrfs_release_path(&path);
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out:
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return err;
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}
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static int btrfs_fsck_reinit_root(struct btrfs_trans_handle *trans,
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struct btrfs_root *root, int overwrite)
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{
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