mhioctkown
static int sd_take_ownership(dev_t dev, struct mhioctkown *p);
struct mhioctkown *tkown = NULL;
tkown = (struct mhioctkown *)
kmem_zalloc(sizeof (struct mhioctkown), KM_SLEEP);
rval = ddi_copyin(arg, tkown, sizeof (struct mhioctkown), flag);
kmem_free(tkown, sizeof (struct mhioctkown));
sd_take_ownership(dev_t dev, struct mhioctkown *p)