Changes since 3.5.24 (20020319)
        - use Scsi_Request::upper_private_data
        - zero buffers for non-root users
    Changes since 3.5.23 (20011231)
        - change EACCES to EPERM when O_RDONLY is insufficient
        - suppress newlines in host string
        - fix xfer direction, old interface, short reply_len [Travers Carter]