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    Subject[patch 4/4] io controller: Put IO controller to use in device mapper and standard make_request() function

    o Tweak standard make_request() function and also the device mapper make
    request functions to enable use of IO controller.

    Signed-off-by: Vivek Goyal <vgoyal@redhat.com>

    Index: linux17/drivers/md/dm.c
    ===================================================================
    --- linux17.orig/drivers/md/dm.c 2008-11-05 18:12:42.000000000 -0500
    +++ linux17/drivers/md/dm.c 2008-11-06 09:16:32.000000000 -0500
    @@ -22,6 +22,7 @@
    #include <linux/hdreg.h>
    #include <linux/blktrace_api.h>
    #include <linux/smp_lock.h>
    +#include <linux/biocontrol.h>

    #define DM_MSG_PREFIX "core"

    @@ -885,6 +886,7 @@ static int dm_request(struct request_que
    int r = -EIO;
    int rw = bio_data_dir(bio);
    struct mapped_device *md = q->queuedata;
    + int ret;

    /*
    * There is no use in forwarding any barrier request since we can't
    @@ -895,6 +897,13 @@ static int dm_request(struct request_que
    return 0;
    }

    + if (!bio_cgroup_disabled() && blk_queue_bio_group_enabled(q)) {
    + ret = bio_group_controller(q, bio);
    + if (ret)
    + /* Either bio got buffered for bio_endio() done */
    + return 0;
    + }
    +
    down_read(&md->io_lock);

    disk_stat_inc(dm_disk(md), ios[rw]);
    @@ -1081,6 +1090,10 @@ static struct mapped_device *alloc_dev(i
    md->queue->unplug_fn = dm_unplug_all;
    blk_queue_merge_bvec(md->queue, dm_merge_bvec);

    + /* Initialize queue spin lock */
    + md->queue->queue_lock = &md->queue->__queue_lock;
    + spin_lock_init(md->queue->queue_lock);
    +
    md->io_pool = mempool_create_slab_pool(MIN_IOS, _io_cache);
    if (!md->io_pool)
    goto bad_io_pool;
    Index: linux17/block/blk-core.c
    ===================================================================
    --- linux17.orig/block/blk-core.c 2008-11-06 09:14:20.000000000 -0500
    +++ linux17/block/blk-core.c 2008-11-06 09:16:32.000000000 -0500
    @@ -1117,10 +1117,18 @@ static int __make_request(struct request
    int el_ret, nr_sectors, barrier, err;
    const unsigned short prio = bio_prio(bio);
    const int sync = bio_sync(bio);
    - int rw_flags;
    + int rw_flags, ret;

    nr_sectors = bio_sectors(bio);

    + if (!bio_cgroup_disabled() && blk_queue_bio_group_enabled(q)) {
    + ret = bio_group_controller(q, bio);
    + if (ret) {
    + /* Either bio got buffered for bio_endio() done */
    + return 0;
    + }
    + }
    +
    /*
    * low level driver can indicate that it wants pages above a
    * certain limit bounced to low memory (ie for highmem, or even
    --



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