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 <t...@kernel.org>
---
block/blk-cgroup.c | 2 ++
block/blk-cgroup.h | 3 ++-
2 files changed, 4 insertions(+), 1 deletion(-)
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 16ea5a1..fbf96ce 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 2446225..40f5b97 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;
--
1.7.11.7
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