From: Tao Ma <tao.ma@oracle.com>
Date: Tue, 18 Aug 2009 03:40:59 +0000 (+0800)
Subject: ocfs2: handle file attributes issue for reflink.
X-Git-Tag: v2.6.32-rc1~173^2~23
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a9063ab9a3827483007124bdb6f9877f0ab4c3f5;p=pandora-kernel.git

ocfs2: handle file attributes issue for reflink.

A reflink creates a snapshot of a file, that means the attributes
must be identical except for three exceptions - nlink, ino, and ctime.

As for time changes, Here is a brief description:

1. Source file:
   1) atime: Ignore. Let the lazy atime code handle that.
   2) mtime: don't touch.
   3) ctime: If we change the tree (adding REFCOUNTED to at least one
             extent), update it.
2. Destination file:
   1) atime: ignore.
   2) mtime: we want it to appear identical to the source.
   3) ctime: update.

The idea here is that an ls -l will show the same time for the
src and target - it shows mtime.  Backup software like rsync and tar
will treat the new file correctly too.

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