From 0647d6bd16c03c928a22d1b90c4c8684c5908f08 Mon Sep 17 00:00:00 2001
From: liubo <liubo2009@cn.fujitsu.com>
Date: Fri, 7 Sep 2012 20:01:26 -0600
Subject: [PATCH] Btrfs: cleanup for unused ref cache stuff

As ref cache has been removed from btrfs, there is no user on
its lock and its check.

Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
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Reading git-format-patch failed