* to make sure the delayed ref is eventually processed before this
  * transaction commits.
  */
-int btrfs_add_delayed_tree_ref(struct btrfs_fs_info *fs_info,
-                              struct btrfs_trans_handle *trans,
+int btrfs_add_delayed_tree_ref(struct btrfs_trans_handle *trans,
                               u64 bytenr, u64 num_bytes, u64 parent,
                               u64 ref_root,  int level, int action,
                               struct btrfs_delayed_extent_op *extent_op,
                               int *old_ref_mod, int *new_ref_mod)
 {
+       struct btrfs_fs_info *fs_info = trans->fs_info;
        struct btrfs_delayed_tree_ref *ref;
        struct btrfs_delayed_ref_head *head_ref;
        struct btrfs_delayed_ref_root *delayed_refs;
 
                kmem_cache_free(btrfs_delayed_ref_head_cachep, head);
 }
 
-int btrfs_add_delayed_tree_ref(struct btrfs_fs_info *fs_info,
-                              struct btrfs_trans_handle *trans,
+int btrfs_add_delayed_tree_ref(struct btrfs_trans_handle *trans,
                               u64 bytenr, u64 num_bytes, u64 parent,
                               u64 ref_root, int level, int action,
                               struct btrfs_delayed_extent_op *extent_op,
 
                           owner, offset, BTRFS_ADD_DELAYED_REF);
 
        if (owner < BTRFS_FIRST_FREE_OBJECTID) {
-               ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr,
+               ret = btrfs_add_delayed_tree_ref(trans, bytenr,
                                                 num_bytes, parent,
                                                 root_objectid, (int)owner,
                                                 BTRFS_ADD_DELAYED_REF, NULL,
                                   root->root_key.objectid,
                                   btrfs_header_level(buf), 0,
                                   BTRFS_DROP_DELAYED_REF);
-               ret = btrfs_add_delayed_tree_ref(fs_info, trans, buf->start,
+               ret = btrfs_add_delayed_tree_ref(trans, buf->start,
                                                 buf->len, parent,
                                                 root->root_key.objectid,
                                                 btrfs_header_level(buf),
                old_ref_mod = new_ref_mod = 0;
                ret = 0;
        } else if (owner < BTRFS_FIRST_FREE_OBJECTID) {
-               ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr,
+               ret = btrfs_add_delayed_tree_ref(trans, bytenr,
                                                 num_bytes, parent,
                                                 root_objectid, (int)owner,
                                                 BTRFS_DROP_DELAYED_REF, NULL,
                btrfs_ref_tree_mod(root, ins.objectid, ins.offset, parent,
                                   root_objectid, level, 0,
                                   BTRFS_ADD_DELAYED_EXTENT);
-               ret = btrfs_add_delayed_tree_ref(fs_info, trans, ins.objectid,
+               ret = btrfs_add_delayed_tree_ref(trans, ins.objectid,
                                                 ins.offset, parent,
                                                 root_objectid, level,
                                                 BTRFS_ADD_DELAYED_EXTENT,