From 7b61cf54a2445ad21df9dd44f0c8bb90154ddea8 Mon Sep 17 00:00:00 2001
From: Tao Ma <tao.ma@oracle.com>
Date: Thu, 17 Jun 2010 14:14:36 +0800
Subject: [PATCH] ocfs2: Add readahead support for CoW.

Add a new function ocfs2_readahead_for_cow so that
we start readahead before we start our CoW.

Signed-off-by: Tao Ma <tao.ma@oracle.com>
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