daddr_t si_size; /* device block size in bytes */
daddr64_t si_lastr; /* last read blkno (read-ahead) */
u_int64_t si_devsize; /* actual device size in bytes */
daddr_t si_size; /* device block size in bytes */
daddr64_t si_lastr; /* last read blkno (read-ahead) */
u_int64_t si_devsize; /* actual device size in bytes */