From 6ea4843f53282465f2bdbe5eedde7d8c3081dfdf Mon Sep 17 00:00:00 2001
From: Tao Ma <tao.ma@oracle.com>
Date: Thu, 12 Aug 2010 10:31:34 +0800
Subject: [PATCH] ocfs2: Add readhead during CoW.

In CoW, when we meet with a readahead page, we know
it is time to move the readahead window. So carry
out a new readahead.

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