From 24115c4e95e137b73954bbbd94354889552a4b08 Mon Sep 17 00:00:00 2001 From: Hao Xu Date: Tue, 7 Dec 2021 17:39:47 +0800 Subject: 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: Pavel Begunkov Signed-off-by: Hao Xu Link: https://lore.kernel.org/r/20211207093951.247840-2-haoxu@linux.alibaba.com Signed-off-by: Jens Axboe --- fs/io-wq.h | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/fs/io-wq.h b/fs/io-wq.h index 41bf37674a49..3709b7c5ec98 100644 --- a/fs/io-wq.h +++ b/fs/io-wq.h @@ -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) { -- cgit v1.2.3