btrfs: Use init_delayed_ref_common in add_delayed_data_ref

Use the newly introduced helper and remove the duplicate code.  No
functional changes.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/delayed-ref.c

@@ -750,41 +750,26 @@ add_delayed_data_ref(struct btrfs_trans_handle *trans,
 {
 	struct btrfs_delayed_data_ref *full_ref;
 	struct btrfs_delayed_ref_root *delayed_refs;
-	u64 seq = 0;
+	u8 ref_type;
 	int ret;
 
-	if (action == BTRFS_ADD_DELAYED_EXTENT)
-		action = BTRFS_ADD_DELAYED_REF;
-
 	delayed_refs = &trans->transaction->delayed_refs;
-
-	if (is_fstree(ref_root))
-		seq = atomic64_read(&trans->fs_info->tree_mod_seq);
-
-	/* first set the basic ref node struct up */
-	refcount_set(&ref->refs, 1);
-	ref->bytenr = bytenr;
-	ref->num_bytes = num_bytes;
-	ref->ref_mod = 1;
-	ref->action = action;
-	ref->is_head = 0;
-	ref->in_tree = 1;
-	ref->seq = seq;
-	RB_CLEAR_NODE(&ref->ref_node);
-	INIT_LIST_HEAD(&ref->add_list);
-
 	full_ref = btrfs_delayed_node_to_data_ref(ref);
-	full_ref->parent = parent;
-	full_ref->root = ref_root;
 	if (parent)
-		ref->type = BTRFS_SHARED_DATA_REF_KEY;
+	        ref_type = BTRFS_SHARED_DATA_REF_KEY;
 	else
-		ref->type = BTRFS_EXTENT_DATA_REF_KEY;
+	        ref_type = BTRFS_EXTENT_DATA_REF_KEY;
 
+	init_delayed_ref_common(trans->fs_info, ref, bytenr, num_bytes,
+				ref_root, action, ref_type);
+	full_ref->root = ref_root;
+	full_ref->parent = parent;
 	full_ref->objectid = owner;
 	full_ref->offset = offset;
 
-	trace_add_delayed_data_ref(trans->fs_info, ref, full_ref, action);
+	trace_add_delayed_data_ref(trans->fs_info, ref, full_ref,
+				   action == BTRFS_ADD_DELAYED_EXTENT ?
+				   BTRFS_ADD_DELAYED_REF : action);
 
 	ret = insert_delayed_ref(trans, delayed_refs, head_ref, ref);
 	if (ret > 0)