From 7d116b626b843c66b17630a62d696e044d049bfc Mon Sep 17 00:00:00 2001
From: =?utf8?q?Fernando=20Luis=20V=C3=A1zquez=20Cao?=
<fernando@oss.ntt.co.jp>
Date: Mon, 27 Oct 2008 18:45:15 +0900
Subject: [PATCH] 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>
---
drivers/block/virtio_blk.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 85d79a02d48..f151592ecf7 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -237,6 +237,8 @@ static int virtblk_probe(struct virtio_device *vdev)
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) {
--
2.41.3