[PATCH 26/42] btrfs: make btrfs_destroy_delayed_refs use btrfs_delayed_ref_lock

[Josef Bacik]

We have this open coded in btrfs_destroy_delayed_refs, use the helper
instead.

Reviewed-by: Nikolay Borisov <nbori...@suse.com>
Signed-off-by: Josef Bacik <jo...@toxicpanda.com>
---
 fs/btrfs/disk-io.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 39bd158466cd..121ab180a78a 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -4214,16 +4214,9 @@ static int btrfs_destroy_delayed_refs(struct 
btrfs_transaction *trans,
 
                head = rb_entry(node, struct btrfs_delayed_ref_head,
                                href_node);
-               if (!mutex_trylock(&head->mutex)) {
-                       refcount_inc(&head->refs);
-                       spin_unlock(&delayed_refs->lock);
-
-                       mutex_lock(&head->mutex);
-                       mutex_unlock(&head->mutex);
-                       btrfs_put_delayed_ref_head(head);
-                       spin_lock(&delayed_refs->lock);
+               if (btrfs_delayed_ref_lock(delayed_refs, head))
                        continue;
-               }
+
                spin_lock(&head->lock);
                while ((n = rb_first(&head->ref_tree)) != NULL) {
                        ref = rb_entry(n, struct btrfs_delayed_ref_node,
-- 
2.14.3