ad_init(&ad, vol->v_adouble, vol->v_ad_options);
if (!ad_open(dst, ADFLAGS_HF, O_RDWR | O_CREAT, 0666, &ad)) {
ad_close(&ad, ADFLAGS_HF);
ad_init(&ad, vol->v_adouble, vol->v_ad_options);
if (!ad_open(dst, ADFLAGS_HF, O_RDWR | O_CREAT, 0666, &ad)) {
ad_close(&ad, ADFLAGS_HF);