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Subject[PATCH 10/21] blkcg: implement blkio_policy_type->cftypes
Date
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>
---
block/blk-cgroup.c | 6 ++++++
block/blk-cgroup.h | 1 +
2 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index df1e197..2f05056 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -1538,6 +1538,9 @@ void blkio_policy_register(struct blkio_policy_type *blkiop)
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 @@ void blkio_policy_unregister(struct blkio_policy_type *blkiop)
{
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_type {
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);
--
1.7.7.3


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