From 3764fd05e1f89530e2ee5cbff0b638f2b1141b90 Mon Sep 17 00:00:00 2001 From: Keith Busch Date: Wed, 5 Jan 2022 09:05:16 -0800 Subject: [PATCH] block: introduce rq_list_for_each_safe macro While iterating a list, a particular request may need to be removed for special handling. Provide an iterator that can safely handle that. Reviewed-by: Christoph Hellwig Signed-off-by: Keith Busch Link: https://lore.kernel.org/r/20220105170518.3181469-3-kbusch@kernel.org Signed-off-by: Jens Axboe --- include/linux/blk-mq.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index bf64b94cd64e..1467f0fa2142 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -242,6 +242,10 @@ static inline unsigned short req_get_ioprio(struct request *req) #define rq_list_for_each(listptr, pos) \ for (pos = rq_list_peek((listptr)); pos; pos = rq_list_next(pos)) +#define rq_list_for_each_safe(listptr, pos, nxt) \ + for (pos = rq_list_peek((listptr)), nxt = rq_list_next(pos); \ + pos; pos = nxt, nxt = pos ? rq_list_next(pos) : NULL) + #define rq_list_next(rq) (rq)->rq_next #define rq_list_empty(list) ((list) == (struct request *) NULL) -- 2.11.0