This is a note to let you know that I've just added the patch titled
btrfs: tree-checker: check for overlapping extent items
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
btrfs-tree-checker-check-for-overlapping-extent-item.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 0599d520506883b8e0763e2949d668c60aa7c8bd
Author: Josef Bacik <josef@xxxxxxxxxxxxxx>
Date: Wed Aug 3 14:28:47 2022 -0400
btrfs: tree-checker: check for overlapping extent items
[ Upstream commit 899b7f69f244e539ea5df1b4d756046337de44a5 ]
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@xxxxxxxx>
Signed-off-by: Josef Bacik <josef@xxxxxxxxxxxxxx>
Reviewed-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/btrfs/tree-checker.c b/fs/btrfs/tree-checker.c
index c0eda3816f685..5b952f69bc1f6 100644
--- a/fs/btrfs/tree-checker.c
+++ b/fs/btrfs/tree-checker.c
@@ -1189,7 +1189,8 @@ 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;
@@ -1400,6 +1401,26 @@ 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;
}
@@ -1568,7 +1589,7 @@ 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:
