block/mq-deadline: Set the fifo_time member also if inserting at head

Before commit 322cff7 the fifo_time member of requests on a dispatch
list was not used. Commit 322cff7 introduces code that reads the
fifo_time member of requests on dispatch lists. Hence this patch that sets
the fifo_time member when adding a request to a dispatch list.

Cc: Christoph Hellwig <[email protected]>
Cc: Ming Lei <[email protected]>
Cc: Damien Le Moal <[email protected]>
Fixes: 322cff7 ("block/mq-deadline: Prioritize high-priority requests")
Signed-off-by: Bart Van Assche <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

block/mq-deadline.c

@@ -742,6 +742,7 @@ static void dd_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq,
 
 	if (at_head) {
 		list_add(&rq->queuelist, &per_prio->dispatch);
+		rq->fifo_time = jiffies;
 	} else {
 		deadline_add_rq_rb(per_prio, rq);