Whoever had done the translation apparently never heard of
big-endian boxen.  Replaced the kludge with get_user()/put_user() on
64bit values.  Note that
struct raw_config_request
{
        int     raw_minor;
        __u64   block_major;
        __u64   block_minor;
};
has __u64 on _all_ platforms and it is used as an integer in raw.c code.
The only reason why translation is needed at all is alignment for 64bit
values; block_major and block_minor themselves should be passed as-is.

	Breakage fixed, entire area annotated.