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block: Set ELEVATOR_F_ZBD_SEQ_WRITE for nullblk zoned disks

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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]>
This commit is contained in:
Damien Le Moal 2019-09-05 18:51:34 +09:00 • committed by Jens Axboe
commit 780d97a990
1 changed files with 2 additions and 0 deletions
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2
drivers/block/null_blk_main.c
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@ -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;