From: Tejun Heo <tj@kernel.org>
Date: Fri, 13 Apr 2012 20:11:32 +0000 (-0700)
Subject: blkcg: add request_queue->root_blkg
X-Git-Tag: v3.5-rc1~42^2~16
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=03d8e11142a893ad322285d3c8a08e88b570cda1;p=pandora-kernel.git

blkcg: add request_queue->root_blkg

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>
---

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