WDUNIT
#define WDLABELDEV(dev) (MAKEWDDEV(major(dev), WDUNIT(dev), RAW_PART))
device_lookup_private(&wd_cd, WDUNIT(bp->b_dev));
unit = WDUNIT(dev);
unit = WDUNIT(dev);
device_lookup_private(&wd_cd, WDUNIT(dev));
unit = WDUNIT(dev);
unit = WDUNIT(dev);
unit = WDUNIT(dev);
device_lookup_private(&wd_cd, WDUNIT(bp->b_dev));