[PATCH 2/3] block/mq-deadline: Introduce dd_bio_ioclass()

[Bart Van Assche <bvanassche@acm.org>]

Prepare for disabling I/O prioritization in certain cases.

Cc: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
 block/mq-deadline.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/block/mq-deadline.c b/block/mq-deadline.c
index e558f3660357..fe5da2ade953 100644
--- a/block/mq-deadline.c
+++ b/block/mq-deadline.c
@@ -128,6 +128,11 @@ static u8 dd_rq_ioclass(struct request *rq)
 	return IOPRIO_PRIO_CLASS(req_get_ioprio(rq));
 }
 
+static u8 dd_bio_ioclass(struct bio *bio)
+{
+	return IOPRIO_PRIO_CLASS(bio->bi_ioprio);
+}
+
 /*
  * get the request before `rq' in sector-sorted order
  */
@@ -744,7 +749,7 @@ static int dd_request_merge(struct request_queue *q, struct request **rq,
 			    struct bio *bio)
 {
 	struct deadline_data *dd = q->elevator->elevator_data;
-	const u8 ioprio_class = IOPRIO_PRIO_CLASS(bio->bi_ioprio);
+	const u8 ioprio_class = dd_bio_ioclass(bio);
 	const enum dd_prio prio = ioprio_class_to_prio[ioprio_class];
 	struct dd_per_prio *per_prio = &dd->per_prio[prio];
 	sector_t sector = bio_end_sector(bio);