395 			   struct btrfs_delayed_ref_head *head)  in btrfs_delayed_ref_lock()  argument
398 	if (mutex_trylock(&head->mutex))  in btrfs_delayed_ref_lock()
401 	refcount_inc(&head->refs);  in btrfs_delayed_ref_lock()
404 	mutex_lock(&head->mutex);  in btrfs_delayed_ref_lock()
406 	if (RB_EMPTY_NODE(&head->href_node)) {  in btrfs_delayed_ref_lock()
407 		mutex_unlock(&head->mutex);  in btrfs_delayed_ref_lock()
408 		btrfs_put_delayed_ref_head(head);  in btrfs_delayed_ref_lock()
411 	btrfs_put_delayed_ref_head(head);  in btrfs_delayed_ref_lock()
417 				    struct btrfs_delayed_ref_head *head,  in drop_delayed_ref()  argument
420 	lockdep_assert_held(&head->lock);  in drop_delayed_ref()
421 	rb_erase_cached(&ref->ref_node, &head->ref_tree);  in drop_delayed_ref()
432 		      struct btrfs_delayed_ref_head *head,  in merge_ref()  argument
460 		drop_delayed_ref(trans, delayed_refs, head, next);  in merge_ref()
463 			drop_delayed_ref(trans, delayed_refs, head, ref);  in merge_ref()
479 			      struct btrfs_delayed_ref_head *head)  in btrfs_merge_delayed_refs()  argument
486 	lockdep_assert_held(&head->lock);  in btrfs_merge_delayed_refs()
488 	if (RB_EMPTY_ROOT(&head->ref_tree.rb_root))  in btrfs_merge_delayed_refs()
492 	if (head->is_data)  in btrfs_merge_delayed_refs()
506 	for (node = rb_first_cached(&head->ref_tree); node;  in btrfs_merge_delayed_refs()
511 		if (merge_ref(trans, delayed_refs, head, ref, seq))  in btrfs_merge_delayed_refs()
541 	struct btrfs_delayed_ref_head *head;  in btrfs_select_ref_head()  local
544 	head = find_ref_head(delayed_refs, delayed_refs->run_delayed_start,  in btrfs_select_ref_head()
546 	if (!head && delayed_refs->run_delayed_start != 0) {  in btrfs_select_ref_head()
548 		head = find_first_ref_head(delayed_refs);  in btrfs_select_ref_head()
550 	if (!head)  in btrfs_select_ref_head()
553 	while (head->processing) {  in btrfs_select_ref_head()
556 		node = rb_next(&head->href_node);  in btrfs_select_ref_head()
563 		head = rb_entry(node, struct btrfs_delayed_ref_head,  in btrfs_select_ref_head()
567 	head->processing = 1;  in btrfs_select_ref_head()
570 	delayed_refs->run_delayed_start = head->bytenr +  in btrfs_select_ref_head()
571 		head->num_bytes;  in btrfs_select_ref_head()
572 	return head;  in btrfs_select_ref_head()
576 			   struct btrfs_delayed_ref_head *head)  in btrfs_delete_ref_head()  argument
579 	lockdep_assert_held(&head->lock);  in btrfs_delete_ref_head()
581 	rb_erase_cached(&head->href_node, &delayed_refs->href_root);  in btrfs_delete_ref_head()
582 	RB_CLEAR_NODE(&head->href_node);  in btrfs_delete_ref_head()
585 	if (head->processing == 0)  in btrfs_delete_ref_head()