From 439cce2df9251b58564f4c359adea99c130afaf9 Mon Sep 17 00:00:00 2001
From: Filipe Manana <fdmanana@suse.com>
Date: Fri, 1 Oct 2021 13:52:32 +0100
Subject: [PATCH] btrfs: deal with errors when adding inode reference during log replay
Git-commit: 52db77791fe24538c8aa2a183248399715f6b380
Patch-mainline: v5.15-rc6
References: stable-5.14.14

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>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 fs/btrfs/tree-log.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index 386c1be78438..5477de95f0fa 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -1182,7 +1182,10 @@ static inline int __add_inode_ref(struct btrfs_trans_handle *trans,
 	/* 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;
@@ -1192,7 +1195,9 @@ static inline int __add_inode_ref(struct btrfs_trans_handle *trans,
 	/* look for a conflicting 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;
-- 
2.26.2