From cdcb725c05fe0cb71777c66ddc2445fedbbb3c59 Mon Sep 17 00:00:00 2001
From: liubo <liubo2009@cn.fujitsu.com>
Date: Wed, 3 Aug 2011 10:15:25 +0000
Subject: [PATCH] Btrfs: check if there is enough space for balancing smarter

When checking if there is enough space for balancing a block group,
since we do not take raid types into consideration, we do not account
corrent amounts of space that we needed.  This makes us do some extra
work before we get ENOSPC.

Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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Reading git-format-patch failed