From: Tao Ma <tao.ma@oracle.com>
Date: Wed, 26 Aug 2009 01:47:28 +0000 (+0800)
Subject: ocfs2: CoW a reflinked cluster when it is truncated.
X-Git-Tag: v2.6.32-rc1~173^2~25
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=37f8a2bfaa8364dd3644cccee8824bb8f5e409a5;p=pandora-kernel.git

ocfs2: CoW a reflinked cluster when it is truncated.

When we truncate a file to a specific size which resides in a reflinked
cluster, we need to CoW it since ocfs2_zero_range_for_truncate will
zero the space after the size(just another type of write).

So we add a "max_cpos" in ocfs2_refcount_cow so that it will stop when
it hit the max cluster offset.

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