zygo: btrfs: don't need the merge_ref warning all the time

(cherry picked from commit 9d645400d3987be35397789556c6f80928af11e8)

diff --git a/fs/btrfs/delayed-ref.c b/fs/btrfs/delayed-ref.c
index afc2f3726dccfd7ce47cdcafe12a72ef0acd537f..beb28db4b3a601896b1d20072d88167c4dd67a15 100644 (file)
--- a/fs/btrfs/delayed-ref.c
+++ b/fs/btrfs/delayed-ref.c
@@ -294,7 +294,7 @@ static bool merge_ref(struct btrfs_trans_handle *trans,
                        /*
                         * Can't have multiples of the same ref on a tree block.
                         */
-                       WARN_ON(ref->type == BTRFS_TREE_BLOCK_REF_KEY ||
+                       WARN_ON_ONCE(ref->type == BTRFS_TREE_BLOCK_REF_KEY ||
                                ref->type == BTRFS_SHARED_BLOCK_REF_KEY);
                }
        }