[PATCH 4.14 05/39] btrfs: deal with errors when adding inode reference during log replay

Greg Kroah-Hartman
2021-10-18T13:28:27Z

From: Filipe Manana <fdmanana@suse.com>

commit 52db77791fe24538c8aa2a183248399715f6b380 upstream.

At __inode_add_ref(), we treating any error returned from
btrfs_lookup_dir_item() or from btrfs_lookup_dir_index_item() as meaning
that there is no existing directory entry in the fs/subvolume tree.
This is not correct since we can get errors such as, for example, -EIO
when reading extent buffers while searching the fs/subvolume's btree.

So fix that and return the error to the caller when it is not -ENOENT.

CC: stable@vger.kernel.org # 4.14+
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/btrfs/tree-log.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -1161,7 +1161,10 @@ next:
/* look for a conflicting sequence number */
di = btrfs_lookup_dir_index_item(trans, root, path, btrfs_ino(dir),
ref_index, name, namelen, 0);
- if (di && !IS_ERR(di)) {
+ if (IS_ERR(di)) {
+ if (PTR_ERR(di) != -ENOENT)
+ return PTR_ERR(di);
+ } else if (di) {
ret = drop_one_dir_item(trans, root, path, dir, di);
if (ret)
return ret;
@@ -1171,7 +1174,9 @@ next:
/* look for a conflicing name */
di = btrfs_lookup_dir_item(trans, root, path, btrfs_ino(dir),
name, namelen, 0);
- if (di && !IS_ERR(di)) {
+ if (IS_ERR(di)) {
+ return PTR_ERR(di);
+ } else if (di) {
ret = drop_one_dir_item(trans, root, path, dir, di);
if (ret)
return ret;