From mboxrd@z Thu Jan  1 00:00:00 1970
From: "lilofile" <lilofile@aliyun.com>
Subject: =?UTF-8?B?YmVoaW5kX3dyaXRlcw==?=
Date: Tue, 23 Sep 2014 13:11:44 +0800
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in struct bitmap,what the behind_writes variable means?