linux-kernel - [PATCH 7/7] bio-cgroup: Add a cgroup support to dm-ioband

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Message-Id: <20080812.213708.39164284.ryov@valinux.co.jp>
Date:	Tue, 12 Aug 2008 21:37:08 +0900 (JST)
From:	Ryo Tsuruta <ryov@...inux.co.jp>
To:	linux-kernel@...r.kernel.org, dm-devel@...hat.com,
	containers@...ts.linux-foundation.org,
	virtualization@...ts.linux-foundation.org,
	xen-devel@...ts.xensource.com
Cc:	agk@...rceware.org, balbir@...ux.vnet.ibm.com, xemul@...nvz.org,
	kamezawa.hiroyu@...fujitsu.com, fernando@....ntt.co.jp
Subject: [PATCH 7/7] bio-cgroup: Add a cgroup support to dm-ioband

With this patch, dm-ioband can work with the bio cgroup.

Based on 2.6.27-rc1-mm1
Signed-off-by: Ryo Tsuruta <ryov@...inux.co.jp>
Signed-off-by: Hirokazu Takahashi <taka@...inux.co.jp>

diff -Ndupr linux-2.6.27-rc1-mm1.cg2/drivers/md/dm-ioband-type.c linux-2.6.27-rc1-mm1.cg3/drivers/md/dm-ioband-type.c
--- linux-2.6.27-rc1-mm1.cg2/drivers/md/dm-ioband-type.c	2008-08-12 14:45:59.000000000 +0900
+++ linux-2.6.27-rc1-mm1.cg3/drivers/md/dm-ioband-type.c	2008-08-12 15:07:03.000000000 +0900
@@ -6,6 +6,7 @@
  * This file is released under the GPL.
  */
 #include <linux/bio.h>
+#include <linux/biocontrol.h>
 #include "dm.h"
 #include "dm-bio-list.h"
 #include "dm-ioband.h"
@@ -53,13 +54,13 @@ static int ioband_node(struct bio *bio)
 
 static int ioband_cgroup(struct bio *bio)
 {
-  /*
-   * This function should return the ID of the cgroup which issued "bio".
-   * The ID of the cgroup which the current process belongs to won't be
-   * suitable ID for this purpose, since some BIOs will be handled by kernel
-   * threads like aio or pdflush on behalf of the process requesting the BIOs.
-   */
-	return 0;	/* not implemented yet */
+	struct io_context *ioc = get_bio_cgroup_iocontext(bio);
+	int id = 0;
+	if (ioc) {
+		id = ioc->id;
+		put_io_context(ioc);
+	}
+	return id;
 }
 
 struct group_type dm_ioband_group_type[] = {
--
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