diff mbox series

[v3,17/30] null_blk: Do not request ELEVATOR_F_ZBD_SEQ_WRITE elevator feature

Message ID 20240328004409.594888-18-dlemoal@kernel.org (mailing list archive)
State New, archived
Headers show
Series Zone write plugging | expand

Commit Message

Damien Le Moal March 28, 2024, 12:43 a.m. UTC 
With zone write plugging enabled at the block layer level, any zone
device can only ever see at most a single write operation per zone.
There is thus no need to request a block scheduler with strick per-zone
sequential write ordering control through the ELEVATOR_F_ZBD_SEQ_WRITE
feature. Removing this allows using a zoned null_blk device with any
scheduler, including "none".

Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
---
 drivers/block/null_blk/zoned.c | 1 -
 1 file changed, 1 deletion(-)

Comments

Christoph Hellwig March 28, 2024, 4:51 a.m. UTC | #1 
Looks good:

Reviewed-by: Christoph Hellwig <hch@lst.de>
Bart Van Assche March 29, 2024, 9:29 p.m. UTC | #2 
On 3/27/24 5:43 PM, Damien Le Moal wrote:
> With zone write plugging enabled at the block layer level, any zone

zone -> zoned

Anyway:

Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Chaitanya Kulkarni April 2, 2024, 6:43 a.m. UTC | #3 
On 3/27/24 17:43, Damien Le Moal wrote:
> With zone write plugging enabled at the block layer level, any zone
> device can only ever see at most a single write operation per zone.
> There is thus no need to request a block scheduler with strick per-zone
> sequential write ordering control through the ELEVATOR_F_ZBD_SEQ_WRITE
> feature. Removing this allows using a zoned null_blk device with any
> scheduler, including "none".
> 
> Signed-off-by: Damien Le Moal<dlemoal@kernel.org>
> Reviewed-by: Hannes Reinecke<hare@suse.de>


Looks good.

Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>

-ck
diff mbox series

Patch

diff --git a/drivers/block/null_blk/zoned.c b/drivers/block/null_blk/zoned.c
index 1689e2584104..8e217f8fadcd 100644
--- a/drivers/block/null_blk/zoned.c
+++ b/drivers/block/null_blk/zoned.c
@@ -165,7 +165,6 @@  int null_register_zoned_dev(struct nullb *nullb)
 	struct request_queue *q = nullb->q;
 
 	blk_queue_flag_set(QUEUE_FLAG_ZONE_RESETALL, q);
-	blk_queue_required_elevator_features(q, ELEVATOR_F_ZBD_SEQ_WRITE);
 	nullb->disk->nr_zones = bdev_nr_zones(nullb->disk->part0);
 	return blk_revalidate_disk_zones(nullb->disk, NULL);
 }