[4/5] btrfs: assert delayed ref lock in btrfs_find_delayed_ref_head

Commit Message

David Sterba May 31, 2019, 5:01 p.m. UTC

Turn the comment about required lock into an assertion.

Signed-off-by: David Sterba <[e-mail]>
---
 fs/btrfs/delayed-ref.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

Patch

diff --git a/fs/btrfs/delayed-ref.c b/fs/btrfs/delayed-ref.c
index a73fc23e2961..a94fae897b3f 100644
--- a/fs/btrfs/delayed-ref.c
+++ b/fs/btrfs/delayed-ref.c
@@ -957,13 +957,14 @@  int btrfs_add_delayed_extent_op(struct btrfs_trans_handle *trans,
 }
 
 /*
- * this does a simple search for the head node for a given extent.
- * It must be called with the delayed ref spinlock held, and it returns
- * the head node if any where found, or NULL if not.
+ * This does a simple search for the head node for a given extent.  Returns the
+ * head node if found, or NULL if not.
  */
 struct btrfs_delayed_ref_head *
 btrfs_find_delayed_ref_head(struct btrfs_delayed_ref_root *delayed_refs, u64 bytenr)
 {
+	lockdep_assert_held(&delayed_refs->lock);
+
 	return find_ref_head(delayed_refs, bytenr, false);
 }