saiostrategy
{ "dksd", saiostrategy, saioopen, saioclose, saioioctl }, /* 1 */
{ "tqsd", saiostrategy, saioopen, saioclose, saioioctl }, /* 2 */
i = saiostrategy(sc, F_READ, (daddr_t)LABELSECTOR, DEV_BSIZE, buf, &cnt);
int saiostrategy(void*, int, daddr_t, size_t, void*, size_t*);