[PATCH] enable possibility of ALL different atime mount options

[Roland Eggner <edvx1@xxxxxxxxxxxxxxxxxx>]

Utako Kusaka has provided this patch
http://oss.sgi.com/archives/xfs/2007-10/msg00168.html
It works for me GRACEFULLY with ALL different atime mount options: 
atime|noatime|relatime.
Note, the mount options are effective, not only accepted.
Prior to this patch, mount option atime has been ignored.

Please put the patch to mainline, it would save worries for users, who need the 
traditional atime
bahavior.  Think of some corner cases for desktop usage.

-- 
Roland Eggner