sd: Set ELEVATOR_F_ZBD_SEQ_WRITE for ZBC disks

Using the helper blk_queue_required_elevator_features(), set the
elevator feature ELEVATOR_F_ZBD_SEQ_WRITE as required for the request
queue of SCSI ZBC disks.

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 <hch@lst.de>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/scsi/sd_zbc.c b/drivers/scsi/sd_zbc.c
index 367614f..de4019d 100644 (file)
--- a/drivers/scsi/sd_zbc.c
+++ b/drivers/scsi/sd_zbc.c
@@ -493,6 +493,8 @@ int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buf)
        blk_queue_chunk_sectors(sdkp->disk->queue,
                        logical_to_sectors(sdkp->device, zone_blocks));
        blk_queue_flag_set(QUEUE_FLAG_ZONE_RESETALL, sdkp->disk->queue);
+       blk_queue_required_elevator_features(sdkp->disk->queue,
+                                            ELEVATOR_F_ZBD_SEQ_WRITE);
        nr_zones = round_up(sdkp->capacity, zone_blocks) >> ilog2(zone_blocks);
 
        /* READ16/WRITE16 is mandatory for ZBC disks */