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>
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 10e1df9..3a8de32 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -113,6 +113,7 @@
blkg->pd[i] = pd;
pd->blkg = blkg;
+ pd->plid = i;
/* invoke per-policy init */
if (pol->pd_init_fn)
@@ -908,6 +909,7 @@
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 2446225..40f5b97 100644
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -81,8 +81,9 @@
* 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;