From: Tao Ma <tao.ma@oracle.com>
Date: Tue, 25 Aug 2009 00:02:48 +0000 (+0800)
Subject: ocfs2: Integrate CoW in file write.
X-Git-Tag: v2.6.32-rc1~173^2~26
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=293b2f70b4a16a1ca91efd28ef3d6634262c6887;p=pandora-kernel.git

ocfs2: Integrate CoW in file write.

When we use mmap, we CoW the refcountd clusters in
ocfs2_write_begin_nolock. While for normal file
io(including directio), we do CoW in
ocfs2_prepare_inode_for_write.

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