From 0424c548976b4c2a72c0bdbea425cf9d51e82d0f Mon Sep 17 00:00:00 2001
From: Miao Xie <miaox@cn.fujitsu.com>
Date: Thu, 6 Mar 2014 13:54:59 +0800
Subject: [PATCH] Btrfs: remove unnecessary lock in may_commit_transaction()

The reason is:
- The per-cpu counter has its own lock to protect itself.
- Here we needn't get a exact value.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
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