CTL_SN_LEN
data_len = 4 + CTL_SN_LEN;
sn_ptr->length = CTL_SN_LEN;
(char *)lun->be_lun->serial_num, CTL_SN_LEN);
memset(sn_ptr->serial_num, 0x20, CTL_SN_LEN);
uint8_t serial_num[CTL_SN_LEN]; /* passed to CTL */
uint8_t serial_num[CTL_SN_LEN];