From 9a9e8a26da4c2c5ddc60999bdea957935fb22b6b Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj@kernel.org>
Date: Mon, 19 Mar 2012 15:10:56 -0700
Subject: blkcg: add blkcg->id

Add 64bit unique id to blkcg.  This will be used by policies which
want blkcg identity test to tell whether the associated blkcg has
changed.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 block/blk-cgroup.h | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'block/blk-cgroup.h')

diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index 9df5ab04b6d..1cb8f764325 100644
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -116,6 +116,9 @@ struct blkio_cgroup {
 	unsigned int weight;
 	spinlock_t lock;
 	struct hlist_head blkg_list;
+
+	/* for policies to test whether associated blkcg has changed */
+	uint64_t id;
 };
 
 struct blkio_group_stats {
-- 
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