After the clean ups it is easier to do the partition patch this one does not
do the check media change and the need_part_check it should work for all
cases since the only two ways to get a valid file are "uml_mconsole 'umid'
config ubd'drive#'='file'" and on the command line with "ubd'drive#'='file'"
which ubd_init will call revalidate. The fdisk program will use the ioctl to
reread the partition table.
<<partition.patch>> against 2.4.18-16um