iodcstrategy
{ "dk", iodcstrategy, dkopen, dkclose, noioctl },
{ "ct", iodcstrategy, ctopen, ctclose, noioctl },
{ "lf", iodcstrategy, lfopen, lfclose, noioctl }
{ "dk", iodcstrategy, dkopen, dkclose, noioctl },
if (iodcstrategy(dp, F_READ, LABELSECTOR, DEV_BSIZE, buf, &ret))
int iodcstrategy(void *, int, daddr_t, size_t, void *, size_t *);