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blkcg: add request_queue->root_blkg

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With per-queue policy activation, root blkg creation will be moved to
blkcg core.  Add q->root_blkg in preparation.  For blk-throtl, this
replaces throtl_data->root_tg; however, cfq needs to keep
cfqd->root_group for !CONFIG_CFQ_GROUP_IOSCHED.

This is to prepare for per-queue policy activation and doesn't cause
any functional difference.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tejun Heo
2012-04-13 13:11:32 -07:00
committed by Jens Axboe
parent b82d4b197c
commit 03d8e11142
3 changed files with 15 additions and 7 deletions
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2
include/linux/blkdev.h
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@@ -31,6 +31,7 @@ struct blk_trace;
struct request;
struct sg_io_hdr;
struct bsg_job;
struct blkio_group;
#define BLKDEV_MIN_RQ 4
#define BLKDEV_MAX_RQ 128 /* Default maximum */
@@ -369,6 +370,7 @@ struct request_queue {
struct list_head icq_list;
#ifdef CONFIG_BLK_CGROUP
struct blkio_group *root_blkg;
struct list_head blkg_list;
#endif