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authorTejun Heo <tj@kernel.org>2015-05-23 00:13:21 +0300
committerJens Axboe <axboe@fb.com>2015-06-02 17:33:33 +0300
commit496d5e7560dbb84399dbd92316fc33857aa83900 (patch)
tree1e60d21e0c680643251ee309382abd7d46d11e67 /block
parent56161634e4824380a67243a4cf3fa52eb1e5d836 (diff)
downloadlinux-496d5e7560dbb84399dbd92316fc33857aa83900.tar.xz
blkcg: add blkcg_root_css
Add global constant blkcg_root_css which points to &blkcg_root.css. This will be used by cgroup writeback support. If blkcg is disabled, it's defined as ERR_PTR(-EINVAL). v2: The declarations moved to include/linux/blk-cgroup.h as suggested by Vivek. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Vivek Goyal <vgoyal@redhat.com> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block')
-rw-r--r--block/blk-cgroup.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 2a4f77f2b229..54ec1721cd3e 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -30,6 +30,8 @@ struct blkcg blkcg_root = { .cfq_weight = 2 * CFQ_WEIGHT_DEFAULT,
.cfq_leaf_weight = 2 * CFQ_WEIGHT_DEFAULT, };
EXPORT_SYMBOL_GPL(blkcg_root);
+struct cgroup_subsys_state * const blkcg_root_css = &blkcg_root.css;
+
static struct blkcg_policy *blkcg_policy[BLKCG_MAX_POLS];
static bool blkcg_policy_enabled(struct request_queue *q,