From b276a876a014c5fa58a16f247c0933f6c42112e3 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Wed, 9 Jan 2013 08:05:12 -0800 Subject: blkcg: add blkg_policy_data->plid Add pd->plid so that the policy a pd belongs to can be identified easily. This will be used to implement hierarchical blkg_[rw]stats. Signed-off-by: Tejun Heo Acked-by: Vivek Goyal --- block/blk-cgroup.c | 2 ++ block/blk-cgroup.h | 3 ++- 2 files changed, 4 insertions(+), 1 deletion(-) (limited to 'block') diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index 10e1df9da46..3a8de321d1f 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -113,6 +113,7 @@ static struct blkcg_gq *blkg_alloc(struct blkcg *blkcg, struct request_queue *q, blkg->pd[i] = pd; pd->blkg = blkg; + pd->plid = i; /* invoke per-policy init */ if (pol->pd_init_fn) @@ -908,6 +909,7 @@ int blkcg_activate_policy(struct request_queue *q, blkg->pd[pol->plid] = pd; pd->blkg = blkg; + pd->plid = pol->plid; pol->pd_init_fn(blkg); spin_unlock(&blkg->blkcg->lock); diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h index 24462258200..40f5b9768aa 100644 --- a/block/blk-cgroup.h +++ b/block/blk-cgroup.h @@ -81,8 +81,9 @@ struct blkg_rwstat { * beginning and pd_size can't be smaller than pd. */ struct blkg_policy_data { - /* the blkg this per-policy data belongs to */ + /* the blkg and policy id this per-policy data belongs to */ struct blkcg_gq *blkg; + int plid; /* used during policy activation */ struct list_head alloc_node; -- cgit v1.2.3