blkcg: implement blkio_policy_type->cftypes
Add blkiop->cftypes which is added and removed together with the
policy. This will be used to move conf/stat handling to the policies.
Signed-off-by: Tejun Heo <tj@kernel.org>
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 53976f2..4e714f8 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -1538,6 +1538,9 @@
list_for_each_entry(q, &all_q_list, all_q_node)
update_root_blkg_pd(q, blkiop->plid);
blkcg_bypass_end();
+
+ if (blkiop->cftypes)
+ WARN_ON(cgroup_add_cftypes(&blkio_subsys, blkiop->cftypes));
}
EXPORT_SYMBOL_GPL(blkio_policy_register);
@@ -1545,6 +1548,9 @@
{
struct request_queue *q;
+ if (blkiop->cftypes)
+ cgroup_rm_cftypes(&blkio_subsys, blkiop->cftypes);
+
blkcg_bypass_start();
spin_lock(&blkio_list_lock);
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index 361ecfa..fa744d5 100644
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -181,6 +181,7 @@
struct blkio_policy_ops ops;
enum blkio_policy_id plid;
size_t pdata_size; /* policy specific private data size */
+ struct cftype *cftypes; /* cgroup files for the policy */
};
extern int blkcg_init_queue(struct request_queue *q);
