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authorTejun Heo <tj@kernel.org>2013-01-09 08:05:12 -0800
committerTejun Heo <tj@kernel.org>2013-01-09 08:05:12 -0800
commitb276a876a014c5fa58a16f247c0933f6c42112e3 (patch)
treec49f85e03d11296683ed938864bd823cdeaa614f /block
parentd02f7aa8dce8166dbbc515ce393912aa45e6b8a6 (diff)
downloadvexpress-lsk-b276a876a014c5fa58a16f247c0933f6c42112e3.tar.gz
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 <tj@kernel.org> Acked-by: Vivek Goyal <vgoyal@redhat.com>
Diffstat (limited to 'block')
-rw-r--r--block/blk-cgroup.c2
-rw-r--r--block/blk-cgroup.h3
2 files changed, 4 insertions, 1 deletions
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;