Btrfs: remove some BUG_ONs() when walking backref tree

The only error return value of __add_prelim_ref() is -ENOMEM,
just return errors rather than trigger BUG_ON().

Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>

1 files changed, 7 insertions, 3 deletions

diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index ba0fee7c3237..66f44c7534d0 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -582,7 +582,8 @@ static int __add_delayed_refs(struct btrfs_delayed_ref_head *head, u64 seq,
                 default:
                         WARN_ON(1);
                 }
-                BUG_ON(ret);
+                if (ret)
+                        return ret;
         }
 
         return 0;
@@ -680,7 +681,8 @@ static int __add_inline_refs(struct btrfs_fs_info *fs_info,
                 default:
                         WARN_ON(1);
                 }
-                BUG_ON(ret);
+                if (ret)
+                        return ret;
                 ptr += btrfs_extent_inline_ref_size(type);
         }
 
@@ -762,7 +764,9 @@ static int __add_keyed_refs(struct btrfs_fs_info *fs_info,
                 default:
                         WARN_ON(1);
                 }
-                BUG_ON(ret);
+                if (ret)
+                        return ret;
+
         }
 
         return ret;