vds_get_ldc_id
if (vds_get_ldc_id(md, vd_node, &ldc_id) != 0) {
if (vds_get_ldc_id(prev_md, prev_vd_node, &prev_ldc_id) != 0) {
if (vds_get_ldc_id(curr_md, curr_vd_node, &curr_ldc_id) != 0) {