hammer2_xop_active
int hammer2_xop_active(hammer2_xop_head_t *xop);
if (hammer2_xop_active(xop)) {
if (hammer2_xop_active(xop) == 0) {
int hammer2_xop_active(hammer2_xop_head_t *xop);
if (hammer2_xop_active(xop)) {
if (hammer2_xop_active(xop) == 0) {