Commit 3764fd05 authored by Keith Busch's avatar Keith Busch Committed by Jens Axboe
Browse files

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: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarKeith Busch <kbusch@kernel.org>
Link: https://lore.kernel.org/r/20220105170518.3181469-3-kbusch@kernel.org


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent edce22e1

include/linux/blk-mq.h

+4 −0
Original line number Diff line number Diff line
@@ -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)