From 43114018cb0b253fd03c4ff4d42bcdc43389ac1c Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj@kernel.org>
Date: Wed, 9 Jan 2013 08:05:13 -0800
Subject: [PATCH] cfq-iosched: add hierarchical cfq_group statistics

Unfortunately, at this point, there's no way to make the existing
statistics hierarchical without creating nasty surprises for the
existing users.  Just create recursive counterpart of the existing
stats.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
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