[Xen-devel] [PATCH 7/7] bio-cgroup: Add a cgroup support to dm-ioband

[Ryo Tsuruta <ryov@xxxxxxxxxxxxx>]

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

Based on 2.6.27-rc1-mm1
Signed-off-by: Ryo Tsuruta <ryov@xxxxxxxxxxxxx>
Signed-off-by: Hirokazu Takahashi <taka@xxxxxxxxxxxxx>

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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