linux-kernel - [PATCH 1/3] block: add queue flag for paravirt frontend drivers

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Message-Id: <1225100686.7370.79.camel@sebastian.kern.oss.ntt.co.jp>
Date:	Mon, 27 Oct 2008 18:44:46 +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 1/3] block: add queue flag for paravirt frontend drivers

As is the case with SSD devices, we do not want to idle in AS/CFQ when
the block device is a paravirt front-end driver. This patch adds a flag
(QUEUE_FLAG_VIRT) which should be used by front-end drivers such as
virtio_blk and xen-blkfront to indicate a paravirtualized device.

Signed-off-by: Fernando Luis Vazquez Cao <fernando@....ntt.co.jp>
---

diff -urNp linux-2.6.28-rc2-orig/include/linux/blkdev.h linux-2.6.28-rc2/include/linux/blkdev.h
--- linux-2.6.28-rc2-orig/include/linux/blkdev.h	2008-10-27 17:41:58.000000000 +0900
+++ linux-2.6.28-rc2/include/linux/blkdev.h	2008-10-27 17:34:49.000000000 +0900
@@ -449,6 +449,7 @@ struct request_queue
 #define QUEUE_FLAG_FAIL_IO     12	/* fake timeout */
 #define QUEUE_FLAG_STACKABLE   13	/* supports request stacking */
 #define QUEUE_FLAG_NONROT      14	/* non-rotational device (SSD) */
+#define QUEUE_FLAG_VIRT        QUEUE_FLAG_NONROT /* paravirt device */
 
 static inline int queue_is_locked(struct request_queue *q)
 {


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