vinum_read: Accept 0 parameters, hand an empty string to the kernel if so. Use new ioctl VINUM_READCONFIG, not VINUM_CREATE, to read config. vinum_start: When passed 0 parameters, drop the devstat kludge and call vinum_read instead. It's no longer necessary to distinguish between "start" and "read" if no parameters are passed, and probably one of them should go away.