OBJSET_BUF_HAS_USERUSED
if (OBJSET_BUF_HAS_USERUSED(os->os_phys_buf)) {
if (OBJSET_BUF_HAS_USERUSED(buf)) {
if (err == 0 && OBJSET_BUF_HAS_USERUSED(buf)) {
if (OBJSET_BUF_HAS_USERUSED(buf)) {
if (OBJSET_BUF_HAS_USERUSED(buf)) {