158 			   struct btrfs_delayed_ref_head *head)  in btrfs_delayed_ref_lock()  argument
164 	if (mutex_trylock(&head->mutex))  in btrfs_delayed_ref_lock()
167 	atomic_inc(&head->node.refs);  in btrfs_delayed_ref_lock()
170 	mutex_lock(&head->mutex);  in btrfs_delayed_ref_lock()
172 	if (!head->node.in_tree) {  in btrfs_delayed_ref_lock()
173 		mutex_unlock(&head->mutex);  in btrfs_delayed_ref_lock()
174 		btrfs_put_delayed_ref(&head->node);  in btrfs_delayed_ref_lock()
177 	btrfs_put_delayed_ref(&head->node);  in btrfs_delayed_ref_lock()
183 				    struct btrfs_delayed_ref_head *head,  in drop_delayed_ref()  argument
187 		head = btrfs_delayed_node_to_head(ref);  in drop_delayed_ref()
188 		rb_erase(&head->href_node, &delayed_refs->href_root);  in drop_delayed_ref()
190 		assert_spin_locked(&head->lock);  in drop_delayed_ref()
202 		      struct btrfs_delayed_ref_head *head,  in merge_ref()  argument
209 	next = list_first_entry(&head->ref_list, struct btrfs_delayed_ref_node,  in merge_ref()
211 	while (!done && &next->list != &head->ref_list) {  in merge_ref()
248 		drop_delayed_ref(trans, delayed_refs, head, next);  in merge_ref()
251 			drop_delayed_ref(trans, delayed_refs, head, ref);  in merge_ref()
270 			      struct btrfs_delayed_ref_head *head)  in btrfs_merge_delayed_refs()  argument
275 	assert_spin_locked(&head->lock);  in btrfs_merge_delayed_refs()
277 	if (list_empty(&head->ref_list))  in btrfs_merge_delayed_refs()
281 	if (head->is_data)  in btrfs_merge_delayed_refs()
294 	ref = list_first_entry(&head->ref_list, struct btrfs_delayed_ref_node,  in btrfs_merge_delayed_refs()
296 	while (&ref->list != &head->ref_list) {  in btrfs_merge_delayed_refs()
300 		if (merge_ref(trans, delayed_refs, head, ref, seq)) {  in btrfs_merge_delayed_refs()
301 			if (list_empty(&head->ref_list))  in btrfs_merge_delayed_refs()
303 			ref = list_first_entry(&head->ref_list,  in btrfs_merge_delayed_refs()
341 	struct btrfs_delayed_ref_head *head;  in btrfs_select_ref_head()  local
349 	head = find_ref_head(&delayed_refs->href_root, start, 1);  in btrfs_select_ref_head()
350 	if (!head && !loop) {  in btrfs_select_ref_head()
354 		head = find_ref_head(&delayed_refs->href_root, start, 1);  in btrfs_select_ref_head()
355 		if (!head)  in btrfs_select_ref_head()
357 	} else if (!head && loop) {  in btrfs_select_ref_head()
361 	while (head->processing) {  in btrfs_select_ref_head()
364 		node = rb_next(&head->href_node);  in btrfs_select_ref_head()
373 		head = rb_entry(node, struct btrfs_delayed_ref_head,  in btrfs_select_ref_head()
377 	head->processing = 1;  in btrfs_select_ref_head()
380 	delayed_refs->run_delayed_start = head->node.bytenr +  in btrfs_select_ref_head()
381 		head->node.num_bytes;  in btrfs_select_ref_head()
382 	return head;  in btrfs_select_ref_head()