unixstrategy
{ devname_hd, unixstrategy, unixopen, unixclose, unixioctl },
{ devname_mmcd, unixstrategy, unixopen, unixclose, unixioctl },
{ devname_path, unixstrategy, unixpathopen, unixclose, unixioctl },
if (unixstrategy((void *)fd, F_READ, MBR_BBSECTOR, DEV_BSIZE, buf,
if (unixstrategy((void *)fd, F_READ, LABELSECTOR,
int unixstrategy(void *, int, daddr_t, size_t, void *, size_t *);