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    Subject[PATCH 7/8] bio-cgroup: Add a cgroup support to dm-ioband
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    With this patch, dm-ioband can work with the bio cgroup.

    Based on 2.6.27-rc5-mm1
    Signed-off-by: Ryo Tsuruta <ryov@valinux.co.jp>
    Signed-off-by: Hirokazu Takahashi <taka@valinux.co.jp>

    diff -Ndupr linux-2.6.27-rc5-mm1.cg2/drivers/md/dm-ioband-type.c linux-2.6.27-rc5-mm1.cg3/drivers/md/dm-ioband-type.c
    --- linux-2.6.27-rc5-mm1.cg2/drivers/md/dm-ioband-type.c 2008-09-24 16:23:13.000000000 +0900
    +++ linux-2.6.27-rc5-mm1.cg3/drivers/md/dm-ioband-type.c 2008-09-24 16:34:52.000000000 +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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