[PATCH 6/7] blk-mq: do not do head insertions post-pre-flush commands

[Christoph Hellwig <hch@lst.de>]

blk_flush_complete_seq currently queues requests that write data after
a pre-flush from the flush state machine at the head of the queue.
This doesn't really make sense, as the original request bypassed all
queue lists by directly diverting to blk_insert_flush from
blk_mq_submit_bio.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
---
 block/blk-flush.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/blk-flush.c b/block/blk-flush.c
index 7121f9ad0762f8..f407a59503173d 100644
--- a/block/blk-flush.c
+++ b/block/blk-flush.c
@@ -188,7 +188,7 @@ static void blk_flush_complete_seq(struct request *rq,
 
 	case REQ_FSEQ_DATA:
 		list_move_tail(&rq->flush.list, &fq->flush_data_in_flight);
-		blk_mq_add_to_requeue_list(rq, BLK_MQ_INSERT_AT_HEAD);
+		blk_mq_add_to_requeue_list(rq, 0);
 		blk_mq_kick_requeue_list(q);
 		break;
 
-- 
2.39.2