path: root/block/blk-throttle.c
diff options
authorTejun Heo <tj@kernel.org>2012-03-05 13:15:11 -0800
committerJens Axboe <axboe@kernel.dk>2012-03-06 21:27:23 +0100
commit7ee9c5620504906e98451dc9a1945b2b9e892cb8 (patch)
tree1daf4d9fc8d03ebbc88ceedb7abeec46d8c71df3 /block/blk-throttle.c
parentblkcg: skip blkg printing if q isn't associated with disk (diff)
blkcg: let blkio_group point to blkio_cgroup directly
Currently, blkg points to the associated blkcg via its css_id. This unnecessarily complicates dereferencing blkcg. Let blkg hold a reference to the associated blkcg and point directly to it and disable css_id on blkio_subsys. This change requires splitting blkiocg_destroy() into blkiocg_pre_destroy() and blkiocg_destroy() so that all blkg's can be destroyed and all the blkcg references held by them dropped during cgroup removal. 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/blk-throttle.c')
1 files changed, 3 insertions, 0 deletions
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 52a429397d3b..fe6a442b8482 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -169,6 +169,9 @@ static void throtl_put_tg(struct throtl_grp *tg)
if (!atomic_dec_and_test(&tg->ref))
+ /* release the extra blkcg reference this blkg has been holding */
+ css_put(&tg->blkg.blkcg->css);
* A group is freed in rcu manner. But having an rcu lock does not
* mean that one can access all the fields of blkg and assume these