From b1c3576961847da26c91b1e97f226bb66be5fa3f Mon Sep 17 00:00:00 2001
From: Vivek Goyal <vgoyal@redhat.com>
Date: Thu, 3 Dec 2009 12:59:47 -0500
Subject: [PATCH] blkio: Take care of cgroup deletion and cfq group reference
 counting

o One can choose to change elevator or delete a cgroup. Implement group
  reference counting so that both elevator exit and cgroup deletion can
  take place gracefully.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Nauman Rafique <nauman@google.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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