bh_read
err = bh_read(bh, 0);
err = bh_read(bh_result, 0);
ret = bh_read(bh, 0);
if (bh_read(bh, REQ_META | REQ_PRIO) < 0)
err = bh_read(bh, 0);
if (bh_read(*bh, 0) < 0) {
if (bh_read(bh, 0) >= 0)
if (bh_read(bh, 0) < 0) {