check_length
const char* check_length(krb5_context, krb5_principal, krb5_data *);
ocs_scsi_dif_check_unknown(ocs_io_t *io, uint32_t length, uint32_t check_length, int is_crc)
last_check_block = ((length + check_length) / blocksize);
static ocs_scsi_io_status_e ocs_scsi_dif_check_unknown(ocs_io_t *io, uint32_t length, uint32_t check_length, int is_crc);