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block: force select mq-deadline for zoned block devices 

In most use cases of zoned block devices (aka SMR disks), the
mq-deadline scheduler is mandatory as it implements sequential write
command processing guarantees with zone write locking. So make sure that
this scheduler is always enabled if CONFIG_BLK_DEV_ZONED is selected.

Tested-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
hifive-unleashed-5.2
Damien Le Moal 2019-06-04 16:23:40 +09:00 committed by Jens Axboe
parent cf8929885d
commit b9aef63aca
1 changed files with 1 additions and 0 deletions
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block/Kconfig
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@ -73,6 +73,7 @@ config BLK_DEV_INTEGRITY
config BLK_DEV_ZONED
bool "Zoned block device support"
select MQ_IOSCHED_DEADLINE
---help---
Block layer zoned block device support. This option enables
support for ZAC/ZBC host-managed and host-aware zoned block devices.