Btrfs: use slabs for delayed reference allocation

The delayed reference allocation is in the fast path of the IO, so use slabs
to improve the speed of the allocation.

And besides that, it can do check for leaked objects when the module is removed.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 65f03670a952..4438aac4947f 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -3614,7 +3614,7 @@ int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
                                 continue;
                         }
 
-                        kfree(head->extent_op);
+                        btrfs_free_delayed_extent_op(head->extent_op);
                         delayed_refs->num_heads--;
                         if (list_empty(&head->cluster))
                                 delayed_refs->num_heads_ready--;