commit b276a876a014c5fa58a16f247c0933f6c42112e3
author Tejun Heo <tj@kernel.org> Wed Jan 09 08:05:12 2013 -0800
committer Tejun Heo <tj@kernel.org> Wed Jan 09 08:05:12 2013 -0800
tree c49f85e03d11296683ed938864bd823cdeaa614f
parent d02f7aa8dce8166dbbc515ce393912aa45e6b8a6

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>

block/blk-cgroup.c

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);