block: introduce 'blk_mq_ctx' parameter to blk_get_flush_queue
This patch adds 'blk_mq_ctx' parameter to blk_get_flush_queue(),
so that this function can find the corresponding blk_flush_queue
bound with current mq context since the flush queue will become
per hw-queue.
For legacy queue, the parameter can be simply 'NULL'.
For multiqueue case, the parameter should be set as the context
from which the related request is originated. With this context
info, the hw queue and related flush queue can be found easily.
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 59ca796..53b6def1 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -518,7 +518,8 @@
struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag)
{
struct request *rq = tags->rqs[tag];
- struct blk_flush_queue *fq = blk_get_flush_queue(rq->q);
+ /* mq_ctx of flush rq is always cloned from the corresponding req */
+ struct blk_flush_queue *fq = blk_get_flush_queue(rq->q, rq->mq_ctx);
if (!is_flush_request(rq, fq, tag))
return rq;