[PATCH 2/3] virtio_blk: set queue paravirt flag

Fernando Luis Vázquez Cao
2008-10-27T09:45:43Z

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>
---

diff -urNp linux-2.6.28-rc2-orig/drivers/block/virtio_blk.c linux-2.6.28-rc2/drivers/block/virtio_blk.c
--- linux-2.6.28-rc2-orig/drivers/block/virtio_blk.c 2008-10-27 17:41:53.000000000 +0900
+++ linux-2.6.28-rc2/drivers/block/virtio_blk.c 2008-10-27 17:34:32.000000000 +0900
@@ -237,6 +237,8 @@ static int virtblk_probe(struct virtio_d
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) {