CDROM_GET_MCN     258 block/compat_ioctl.c 	case CDROM_GET_MCN:
CDROM_GET_MCN    3369 drivers/cdrom/cdrom.c 	case CDROM_GET_MCN:
CDROM_GET_MCN      81 include/uapi/linux/cdrom.h #define CDROM_GET_UPC		CDROM_GET_MCN  /* This one is deprecated,