blkdevstrategy
i = blkdevstrategy(NULL, F_READ,
int blkdevstrategy(void *, int, daddr_t, size_t, void *, size_t *);
int blkdevstrategy(void *, int, daddr_t, size_t, void *, size_t *);
int blkdevstrategy(void *, int, daddr_t, size_t, void *, size_t *);