[PATCH 1/2] btrfs: fix BUG_ON with proper error handle in find_next_devid

[Anand Jain <anand.jain@oracle.com>]

In a corrupted tree if search for next devid finds the device with
devid = -1, then report the error -EUCLEAN back to the parent
function to fail gracefully.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
---
 fs/btrfs/volumes.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 4db4a100c05b..36aa5f79fb6c 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1849,7 +1849,12 @@ static noinline int find_next_devid(struct btrfs_fs_info *fs_info,
 	if (ret < 0)
 		goto error;
 
-	BUG_ON(ret == 0); /* Corruption */
+	if (ret == 0) {
+		/* Corruption */
+		btrfs_err(fs_info, "corrupted chunk tree devid -1 matched");
+		ret = -EUCLEAN;
+		goto error;
+	}
 
 	ret = btrfs_previous_item(fs_info->chunk_root, path,
 				  BTRFS_DEV_ITEMS_OBJECTID,
-- 
2.21.0 (Apple Git-120)