[PATCHv2 1/3] block: introduce rq_list_for_each_safe macro
flat view
From: Keith Busch <kbusch@kernel.org>
Date: 2021-12-27 16:41:48
Also in:
linux-nvme
Subsystem:
block layer, the rest · Maintainers:
Jens Axboe, Linus Torvalds
While iterating a list, a particular request may need to be removed for special handling. Provide an iterator that can safely handle that. Signed-off-by: Keith Busch <kbusch@kernel.org> --- include/linux/blkdev.h | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 22746b2d6825..c4597ccdaf26 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h@@ -1365,6 +1365,10 @@ struct io_comp_batch { #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)
--
2.25.4