[PATCH 6.6 021/567] btrfs: fix incorrect key offset in error message in check_dev_extent_item()

Greg Kroah-Hartman
2026-03-23T14:52:31Z

6.6-stable review patch. If anyone has any objections, please let me know.

------------------

From: Mark Harmstone <mark@harmstone.com>

[ Upstream commit 511dc8912ae3e929c1a182f5e6b2326516fd42a0 ]

Fix the error message in check_dev_extent_item(), when an overlapping
stripe is encountered. For dev extents, objectid is the disk number and
offset the physical address, so prev_key->objectid should actually be
prev_key->offset.

(I can't take any credit for this one - this was discovered by Chris and
his friend Claude.)

Reported-by: Chris Mason <clm@fb.com>
Fixes: 008e2512dc56 ("btrfs: tree-checker: add dev extent item checks")
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Mark Harmstone <mark@harmstone.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/btrfs/tree-checker.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/btrfs/tree-checker.c b/fs/btrfs/tree-checker.c
index 0d93368c1691a..bca5ec4c26630 100644
--- a/fs/btrfs/tree-checker.c
+++ b/fs/btrfs/tree-checker.c
@@ -1802,7 +1802,7 @@ static int check_dev_extent_item(const struct extent_buffer *leaf,
if (unlikely(prev_key->offset + prev_len > key->offset)) {
generic_err(leaf, slot,
"dev extent overlap, prev offset %llu len %llu current offset %llu",
- prev_key->objectid, prev_len, key->offset);
+ prev_key->offset, prev_len, key->offset);
return -EUCLEAN;
}
}
--
2.51.0