mfi_build_cdb
cdb_len = mfi_build_cdb(readop, 0, bio->bio_pblkno, blkcount,
cdb_len = mfi_build_cdb(readop, 0, lba, blkcount, pass->cdb);
cdb_len = mfi_build_cdb(readop, 0, lba,
extern int mfi_build_cdb(int, uint8_t, u_int64_t, u_int32_t, uint8_t *);