From mboxrd@z Thu Jan  1 00:00:00 1970
From: majianpeng <majianpeng@gmail.com>
Subject: Re: Re: [PATCH 2/2] raid5: For write performance, remove REQ_SYNC when write was odirect.
Date: Mon, 16 Jul 2012 14:42:54 +0800
Message-ID: <201207161442513597497@gmail.com>
References: <201207160931507187344@gmail.com>,
	<20120716154010.0ef12c57@notabene.brown>
Mime-Version: 1.0
Content-Type: text/plain;
	charset="gb2312"
Content-Transfer-Encoding: base64
Cc: viro <viro@ZenIV.linux.org.uk>,
	linux-raid <linux-raid@vger.kernel.org>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>
To: "Neil Brown" <neilb@suse.de>
Return-path: <linux-fsdevel-owner@vger.kernel.org>
Received: from mail-pb0-f46.google.com ([209.85.160.46]:36954 "EHLO
	mail-pb0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1750798Ab2GPGlu (ORCPT
	<rfc822;linux-fsdevel@vger.kernel.org>);
	Mon, 16 Jul 2012 02:41:50 -0400
Sender: linux-fsdevel-owner@vger.kernel.org
List-ID: <linux-fsdevel.vger.kernel.org>
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=