Btrfs: try to cleanup delayed refs while freeing extents

[linux-2.6-omap-h63xx.git] / fs / btrfs / delayed-ref.c

diff --git a/fs/btrfs/delayed-ref.c b/fs/btrfs/delayed-ref.c
index 874565a1f634ae197fab853cb78a041df519e2db..3e7eeaf86408c9d66a125a71e3b7317613978fd0 100644 (file)
--- a/fs/btrfs/delayed-ref.c
+++ b/fs/btrfs/delayed-ref.c
@@ -510,6 +510,24 @@ int btrfs_add_delayed_ref(struct btrfs_trans_handle *trans,
        return 0;
 }
 
+/*
+ * 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.
+ */
+struct btrfs_delayed_ref_head *
+btrfs_find_delayed_ref_head(struct btrfs_trans_handle *trans, u64 bytenr)
+{
+       struct btrfs_delayed_ref_node *ref;
+       struct btrfs_delayed_ref_root *delayed_refs;
+
+       delayed_refs = &trans->transaction->delayed_refs;
+       ref = tree_search(&delayed_refs->root, bytenr, (u64)-1);
+       if (ref)
+               return btrfs_delayed_node_to_head(ref);
+       return NULL;
+}
+
 /*
  * add a delayed ref to the tree.  This does all of the accounting required
  * to make sure the delayed ref is eventually processed before this