block: introduce blk_flush_queue to drive flush machinery
This patch introduces 'struct blk_flush_queue' and puts all
flush machinery related fields into this structure, so that
- flush implementation details aren't exposed to driver
- it is easy to convert to per dispatch-queue flush machinery
This patch is basically a mechanical replacement.
Reviewed-by: Christoph Hellwig <hch@lst.de>
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 2758cdf..d39e8a5 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -508,20 +508,22 @@
}
EXPORT_SYMBOL(blk_mq_kick_requeue_list);
-static inline bool is_flush_request(struct request *rq, unsigned int tag)
+static inline bool is_flush_request(struct request *rq,
+ struct blk_flush_queue *fq, unsigned int tag)
{
return ((rq->cmd_flags & REQ_FLUSH_SEQ) &&
- rq->q->flush_rq->tag == tag);
+ fq->flush_rq->tag == tag);
}
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);
- if (!is_flush_request(rq, tag))
+ if (!is_flush_request(rq, fq, tag))
return rq;
- return rq->q->flush_rq;
+ return fq->flush_rq;
}
EXPORT_SYMBOL(blk_mq_tag_to_rq);