block: Set ELEVATOR_F_ZBD_SEQ_WRITE for nullblk zoned disks

Using the helper blk_queue_required_elevator_features(), set the elevator feature ELEVATOR_F_ZBD_SEQ_WRITE as required for the request queue of null_blk devices created with zoned mode enabled. This feature requirement can always be satisfied as the mq-deadline elevator is always selected for in-kernel compilation when CONFIG_BLK_DEV_ZONED (zoned block device support) is enabled. Reviewed-by: Christoph Hellwig <[email protected]> Reviewed-by: Johannes Thumshirn <[email protected]> Reviewed-by: Ming Lei <[email protected]> Signed-off-by: Damien Le Moal <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
adn770 · Sep 6, 2019 · 780d97a · 780d97a
1 parent 737eb78
commit 780d97a
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/drivers/block/null_blk_main.c b/drivers/block/null_blk_main.c
@@ -1695,6 +1695,8 @@ static int null_add_dev(struct nullb_device *dev)
 		blk_queue_chunk_sectors(nullb->q, dev->zone_size_sects);
 		nullb->q->limits.zoned = BLK_ZONED_HM;
 		blk_queue_flag_set(QUEUE_FLAG_ZONE_RESETALL, nullb->q);
+		blk_queue_required_elevator_features(nullb->q,
+						ELEVATOR_F_ZBD_SEQ_WRITE);
 	}
 
 	nullb->q->queuedata = nullb;