GFS: Unable to mount NFS-over-GFS
    
    This patch is a kludge to fix the patch for bug #449330.
    With bug #449330, the problem was that the stat() syscall on a file
    in GFS returned the ID of the diapered device in st_dev, not the
    "real" underlying device.  The problem is, NFS mounts are an
    exception: they require the diapered device to be returned.
    This is not a problem in upstream code because newer versions of
    GFS don't use a diapered device, only the "real" device.
    
    rhbz#610154