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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>
This commit is contained in:
Tejun Heo 2013-01-09 08:05:12 -08:00
parent d02f7aa8dc
commit b276a876a0
2 changed files with 4 additions and 1 deletions
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2
block/blk-cgroup.c
View File

@ -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);

3
block/blk-cgroup.h
View File

@ -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;