REQ_WIRED
if (req.lock == REQ_WIRED && req.validlen > 0)
if (req->lock != REQ_WIRED)
if (req->lock == REQ_WIRED) {
if (req->lock != REQ_WIRED && req->oldptr &&
req->lock = REQ_WIRED;
if (req.lock == REQ_WIRED && req.validlen > 0)