232 static inline int rq_list_empty(const struct rq_list *rl)  in rq_list_empty()  argument
234 	return rl->head == NULL;  in rq_list_empty()
237 static inline void rq_list_init(struct rq_list *rl)  in rq_list_init()  argument
239 	rl->head = NULL;  in rq_list_init()
240 	rl->tail = NULL;  in rq_list_init()
243 static inline void rq_list_add_tail(struct rq_list *rl, struct request *rq)  in rq_list_add_tail()  argument
246 	if (rl->tail)  in rq_list_add_tail()
247 		rl->tail->rq_next = rq;  in rq_list_add_tail()
249 		rl->head = rq;  in rq_list_add_tail()
250 	rl->tail = rq;  in rq_list_add_tail()
253 static inline void rq_list_add_head(struct rq_list *rl, struct request *rq)  in rq_list_add_head()  argument
255 	rq->rq_next = rl->head;  in rq_list_add_head()
256 	rl->head = rq;  in rq_list_add_head()
257 	if (!rl->tail)  in rq_list_add_head()
258 		rl->tail = rq;  in rq_list_add_head()
261 static inline struct request *rq_list_pop(struct rq_list *rl)  in rq_list_pop()  argument
263 	struct request *rq = rl->head;  in rq_list_pop()
266 		rl->head = rl->head->rq_next;  in rq_list_pop()
267 		if (!rl->head)  in rq_list_pop()
268 			rl->tail = NULL;  in rq_list_pop()
275 static inline struct request *rq_list_peek(struct rq_list *rl)  in rq_list_peek()  argument
277 	return rl->head;  in rq_list_peek()
280 #define rq_list_for_each(rl, pos)					\  argument
281 	for (pos = rq_list_peek((rl)); (pos); pos = pos->rq_next)
283 #define rq_list_for_each_safe(rl, pos, nxt)				\  argument
284 	for (pos = rq_list_peek((rl)), nxt = pos->rq_next;		\