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authorTejun Heo <tj@kernel.org>2012-04-14 00:11:32 +0400
committerJens Axboe <axboe@kernel.dk>2012-04-20 12:06:06 +0400
commit03d8e11142a893ad322285d3c8a08e88b570cda1 (patch)
tree0f6117ffdb0ad9565a165a98a8d4985ced094eb1 /block/cfq-iosched.c
parentb82d4b197c782ced82a8b7b76664125d2d3c156c (diff)
downloadlinux-03d8e11142a893ad322285d3c8a08e88b570cda1.tar.xz
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>
Diffstat (limited to 'block/cfq-iosched.c')
-rw-r--r--block/cfq-iosched.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index de95f9a2acf8..86440e04f3ee 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -3964,8 +3964,10 @@ static int cfq_init_queue(struct request_queue *q)
spin_lock_irq(q->queue_lock);
blkg = blkg_lookup_create(&blkio_root_cgroup, q, true);
- if (!IS_ERR(blkg))
+ if (!IS_ERR(blkg)) {
+ q->root_blkg = blkg;
cfqd->root_group = blkg_to_cfqg(blkg);
+ }
spin_unlock_irq(q->queue_lock);
rcu_read_unlock();