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

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Date:	Mon, 27 Oct 2008 18:45:15 +0900
From:	Fernando Luis Vázquez Cao 
	<fernando@....ntt.co.jp>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	rusty@...tcorp.com.au, linux-kernel@...r.kernel.org,
	jeremy@...source.com
Subject: [PATCH 2/3] 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@....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) {


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