blk_mq_requeue_work() inserts requeued requests in front of other
requests. This is fine for all request types except for sequential zoned
writes. Hence this patch.
Note: moving this functionality into the mq-deadline I/O scheduler is
not an option because we want to be able to use zoned storage without
I/O scheduler.
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Damien Le Moal <dlemoal@xxxxxxxxxx>
Cc: Ming Lei <ming.lei@xxxxxxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxx>
Signed-off-by: Bart Van Assche <bvanassche@xxxxxxx>
---
block/blk-mq.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 502dafa76716..ce6ddb249959 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1485,7 +1485,9 @@ static void blk_mq_requeue_work(struct work_struct *work)
blk_mq_request_bypass_insert(rq, 0);
} else {
list_del_init(&rq->queuelist);
- blk_mq_insert_request(rq, BLK_MQ_INSERT_AT_HEAD);
+ blk_mq_insert_request(rq,
+ !blk_rq_is_seq_zoned_write(rq) ?
+ BLK_MQ_INSERT_AT_HEAD : 0);
}
}
