mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-04 09:59:32 +00:00
Code Issues Releases Wiki Activity

btrfs: tree-checker: check for overlapping extent items

Browse source 
[ Upstream commit 899b7f69f2 ]

We're seeing a weird problem in production where we have overlapping
extent items in the extent tree.  It's unclear where these are coming
from, and in debugging we realized there's no check in the tree checker
for this sort of problem.  Add a check to the tree-checker to make sure
that the extents do not overlap each other.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Josef Bacik 2022-08-03 14:28:47 -04:00 committed by Greg Kroah-Hartman
parent 63c7905840
commit 06ebb40b87
1 changed files with 23 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

25
fs/btrfs/tree-checker.c
View file

@ -1019,7 +1019,8 @@ static void extent_err(const struct extent_buffer *eb, int slot,
}
static int check_extent_item(struct extent_buffer *leaf,
struct btrfs_key *key, int slot)
struct btrfs_key *key, int slot,
struct btrfs_key *prev_key)
{
struct btrfs_fs_info *fs_info = leaf->fs_info;
struct btrfs_extent_item *ei;
@ -1230,6 +1231,26 @@ static int check_extent_item(struct extent_buffer *leaf,
total_refs, inline_refs);
return -EUCLEAN;
}
if ((prev_key->type == BTRFS_EXTENT_ITEM_KEY) ||
(prev_key->type == BTRFS_METADATA_ITEM_KEY)) {
u64 prev_end = prev_key->objectid;
if (prev_key->type == BTRFS_METADATA_ITEM_KEY)
prev_end += fs_info->nodesize;
else
prev_end += prev_key->offset;
if (unlikely(prev_end > key->objectid)) {
extent_err(leaf, slot,
"previous extent [%llu %u %llu] overlaps current extent [%llu %u %llu]",
prev_key->objectid, prev_key->type,
prev_key->offset, key->objectid, key->type,
key->offset);
return -EUCLEAN;
}
}
return 0;
}
@ -1343,7 +1364,7 @@ static int check_leaf_item(struct extent_buffer *leaf,
break;
case BTRFS_EXTENT_ITEM_KEY:
case BTRFS_METADATA_ITEM_KEY:
ret = check_extent_item(leaf, key, slot);
ret = check_extent_item(leaf, key, slot, prev_key);
break;
case BTRFS_TREE_BLOCK_REF_KEY:
case BTRFS_SHARED_DATA_REF_KEY: