412 			   struct btrfs_delayed_ref_head *head)  in btrfs_delayed_ref_lock()  argument
415 	if (mutex_trylock(&head->mutex))  in btrfs_delayed_ref_lock()
418 	refcount_inc(&head->refs);  in btrfs_delayed_ref_lock()
421 	mutex_lock(&head->mutex);  in btrfs_delayed_ref_lock()
423 	if (RB_EMPTY_NODE(&head->href_node)) {  in btrfs_delayed_ref_lock()
424 		mutex_unlock(&head->mutex);  in btrfs_delayed_ref_lock()
425 		btrfs_put_delayed_ref_head(head);  in btrfs_delayed_ref_lock()
428 	btrfs_put_delayed_ref_head(head);  in btrfs_delayed_ref_lock()
434 				    struct btrfs_delayed_ref_head *head,  in drop_delayed_ref()  argument
437 	lockdep_assert_held(&head->lock);  in drop_delayed_ref()
438 	rb_erase_cached(&ref->ref_node, &head->ref_tree);  in drop_delayed_ref()
449 		      struct btrfs_delayed_ref_head *head,  in merge_ref()  argument
477 		drop_delayed_ref(trans, delayed_refs, head, next);  in merge_ref()
480 			drop_delayed_ref(trans, delayed_refs, head, ref);  in merge_ref()
496 			      struct btrfs_delayed_ref_head *head)  in btrfs_merge_delayed_refs()  argument
503 	lockdep_assert_held(&head->lock);  in btrfs_merge_delayed_refs()
505 	if (RB_EMPTY_ROOT(&head->ref_tree.rb_root))  in btrfs_merge_delayed_refs()
509 	if (head->is_data)  in btrfs_merge_delayed_refs()
514 	for (node = rb_first_cached(&head->ref_tree); node;  in btrfs_merge_delayed_refs()
519 		if (merge_ref(trans, delayed_refs, head, ref, seq))  in btrfs_merge_delayed_refs()
542 	struct btrfs_delayed_ref_head *head;  in btrfs_select_ref_head()  local
545 	head = find_ref_head(delayed_refs, delayed_refs->run_delayed_start,  in btrfs_select_ref_head()
547 	if (!head && delayed_refs->run_delayed_start != 0) {  in btrfs_select_ref_head()
549 		head = find_first_ref_head(delayed_refs);  in btrfs_select_ref_head()
551 	if (!head)  in btrfs_select_ref_head()
554 	while (head->processing) {  in btrfs_select_ref_head()
557 		node = rb_next(&head->href_node);  in btrfs_select_ref_head()
564 		head = rb_entry(node, struct btrfs_delayed_ref_head,  in btrfs_select_ref_head()
568 	head->processing = 1;  in btrfs_select_ref_head()
571 	delayed_refs->run_delayed_start = head->bytenr +  in btrfs_select_ref_head()
572 		head->num_bytes;  in btrfs_select_ref_head()
573 	return head;  in btrfs_select_ref_head()
577 			   struct btrfs_delayed_ref_head *head)  in btrfs_delete_ref_head()  argument
580 	lockdep_assert_held(&head->lock);  in btrfs_delete_ref_head()
582 	rb_erase_cached(&head->href_node, &delayed_refs->href_root);  in btrfs_delete_ref_head()
583 	RB_CLEAR_NODE(&head->href_node);  in btrfs_delete_ref_head()
586 	if (head->processing == 0)  in btrfs_delete_ref_head()