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btrfs-progs: check: introduce function to check chunk item

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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>
This commit is contained in:
Lu Fengqi 2016-04-24 15:00:24 +08:00 committed by David Sterba
parent 406a4cdea4
commit f6647e2131
1 changed files with 115 additions and 0 deletions
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115
cmds-check.c
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@ -9590,6 +9590,121 @@ out:
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;
}
static int btrfs_fsck_reinit_root(struct btrfs_trans_handle *trans,
struct btrfs_root *root, int overwrite)
{