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From: Damien Le Moal <damien.lemoal@wdc.com>
To: linux-block@vger.kernel.org, Jens Axboe <axboe@kernel.dk>,
	linux-scsi@vger.kernel.org,
	"Martin K . Petersen" <martin.petersen@oracle.com>
Subject: [PATCH v3 6/7] block: Set ELEVATOR_F_ZBD_SEQ_WRITE for nullblk zoned disks
Date: Wed,  4 Sep 2019 17:42:46 +0900	[thread overview]
Message-ID: <20190904084247.23338-7-damien.lemoal@wdc.com> (raw)
In-Reply-To: <20190904084247.23338-1-damien.lemoal@wdc.com>

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.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 drivers/block/null_blk_main.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/block/null_blk_main.c b/drivers/block/null_blk_main.c
index b26a178d064d..b29b273690b0 100644
--- 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;
-- 
2.21.0


  parent reply	other threads:[~2019-09-04  8:43 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-04  8:42 [PATCH v3 0/7] Elevator cleanups and improvements Damien Le Moal
2019-09-04  8:42 ` [PATCH v3 1/7] block: Cleanup elevator_init_mq() use Damien Le Moal
2019-09-04  9:02   ` Ming Lei
2019-09-04  8:42 ` [PATCH v3 2/7] block: Change elevator_init_mq() to always succeed Damien Le Moal
2019-09-04  9:05   ` Ming Lei
2019-09-04  8:42 ` [PATCH v3 3/7] block: Introduce elevator features Damien Le Moal
2019-09-04  8:42 ` [PATCH v3 4/7] block: Improve default elevator selection Damien Le Moal
2019-09-04  8:51   ` Johannes Thumshirn
2019-09-04  8:42 ` [PATCH v3 5/7] block: Delay default elevator initialization Damien Le Moal
2019-09-04  8:56   ` Johannes Thumshirn
2019-09-04  9:02     ` Damien Le Moal
2019-09-04 12:56       ` Jens Axboe
2019-09-05  4:30         ` Damien Le Moal
2019-09-04  9:29   ` Ming Lei
2019-09-04  8:42 ` Damien Le Moal [this message]
2019-09-04  8:52   ` [PATCH v3 6/7] block: Set ELEVATOR_F_ZBD_SEQ_WRITE for nullblk zoned disks Johannes Thumshirn
2019-09-04  8:42 ` [PATCH v3 7/7] sd: Set ELEVATOR_F_ZBD_SEQ_WRITE for ZBC disks Damien Le Moal
2019-09-04  8:52   ` Johannes Thumshirn

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