xfarray_iter
while ((error = xfarray_iter(ragi->iunlink_next, &idx, &agino)) == 1) {
while ((error = xfarray_iter(ragi->iunlink_prev, &idx, &agino)) == 1) {
while ((error = xfarray_iter(ra->free_records, &cur, &arec)) == 1) {
while ((error = xfarray_iter(xnc->nlinks, &cur, &nl)) == 1) {
while ((error = xfarray_iter(counts, &cur, &xcdq)) == 1) {
while ((error = xfarray_iter(counts, &cur, &xcdq)) == 1) {