virtio_blk: set queue paravirt flag
As a paravirt front-end driver, virtio_blk is not a rotational device so
we want do avoid idling in AS/CFQ. Tell the block layer about this.
Signed-off-by: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 85d79a0..f151592 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -237,6 +237,8 @@
goto out_put_disk;
}
+ queue_flag_set_unlocked(QUEUE_FLAG_VIRT, vblk->disk->queue);
+
if (index < 26) {
sprintf(vblk->disk->disk_name, "vd%c", 'a' + index % 26);
} else if (index < (26 + 1) * 26) {