[PATCH v2 2/3] btrfs: add "rescue=usebackuproot" into "rescue=all" shortcut

The mount option "rescue=all" should be a shortcut to include all
"rescue=" mount options. but unfortunately "rescue=usebackuproot" is not
include.

Include that option so "rescue=all" have a better chance to mount a
corrupted fs.

Signed-off-by: Qu Wenruo <[email protected]>
---
 fs/btrfs/super.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index fef9025a2f76..742f646ec12c 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -620,6 +620,7 @@ static int btrfs_parse_param(struct fs_context *fc, struct fs_parameter *param)
 			btrfs_set_opt(ctx->mount_opt, IGNORESUPERFLAGS);
 			btrfs_set_opt(ctx->mount_opt, IGNOREBADROOTS);
 			btrfs_set_opt(ctx->mount_opt, NOLOGREPLAY);
+			btrfs_set_opt(ctx->mount_opt, USEBACKUPROOT);
 			break;
 		default:
 			btrfs_info(NULL, "unrecognized rescue option '%s'",
-- 
2.54.0