btrfs: replace BUG in can_modify_feature

We don't need to crash hard here, it's just reading a sysfs file. The
values considered in switch are from a fixed set, the default case
should not happen at all.

Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index 8fdc0520e298..b535285642dc 100644
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -75,7 +75,9 @@ static int can_modify_feature(struct btrfs_feature_attr *fa)
                 clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR;
                 break;
         default:
-                BUG();
+                printk(KERN_WARNING "btrfs: sysfs: unknown feature set %d\n",
+                                fa->feature_set);
+                return 0;
         }
 
         if (set & fa->feature_bit)