Commit 24115c4e authored by Hao Xu's avatar Hao Xu Committed by Jens Axboe
Browse files

io-wq: add helper to merge two wq_lists 



add a helper to merge two wq_lists, it will be useful in the next
patches.

Reviewed-by: default avatarPavel Begunkov <asml.silence@gmail.com>
Signed-off-by: default avatarHao Xu <haoxu@linux.alibaba.com>
Link: https://lore.kernel.org/r/20211207093951.247840-2-haoxu@linux.alibaba.com


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent a90c8bf6

fs/io-wq.h

+22 −0
Original line number Diff line number Diff line
@@ -52,6 +52,28 @@ static inline void wq_list_add_after(struct io_wq_work_node *node, 
		list->last = node;

}



/**

 * wq_list_merge - merge the second list to the first one.

 * @list0: the first list

 * @list1: the second list

 * Return the first node after mergence.

 */

static inline struct io_wq_work_node *wq_list_merge(struct io_wq_work_list *list0,

						    struct io_wq_work_list *list1)

{

	struct io_wq_work_node *ret;



	if (!list0->first) {

		ret = list1->first;

	} else {

		ret = list0->first;

		list0->last->next = list1->first;

	}

	INIT_WQ_LIST(list0);

	INIT_WQ_LIST(list1);

	return ret;

}



static inline void wq_list_add_tail(struct io_wq_work_node *node,

				    struct io_wq_work_list *list)

{