[PATCH 13/26] null_blk: Do not request ELEVATOR_F_ZBD_SEQ_WRITE elevator feature

Damien Le Moal
2024-02-02T07:31:26Z

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>
---
drivers/block/null_blk/zoned.c | 1 -
1 file changed, 1 deletion(-)

diff --git a/drivers/block/null_blk/zoned.c b/drivers/block/null_blk/zoned.c
index 6f5e0994862e..f2cb6da0dd0d 100644
--- a/drivers/block/null_blk/zoned.c
+++ b/drivers/block/null_blk/zoned.c
@@ -161,7 +161,6 @@ int null_register_zoned_dev(struct nullb *nullb)

disk_set_zoned(nullb->disk);
blk_queue_flag_set(QUEUE_FLAG_ZONE_RESETALL, q);
- blk_queue_required_elevator_features(q, ELEVATOR_F_ZBD_SEQ_WRITE);
blk_queue_chunk_sectors(q, dev->zone_size_sects);
nullb->disk->nr_zones = bdev_nr_zones(nullb->disk->part0);
blk_queue_max_zone_append_sectors(q, dev->zone_size_sects);
--
2.43.0