tws_timeout
void tws_timeout(void *arg);
tws_timeout, req, 0);
callout_reset(&req->timeout, (TWS_IO_TIMEOUT * hz), tws_timeout, req);
callout_reset(&req->timeout, (TWS_IOCTL_TIMEOUT * hz), tws_timeout, req);
tws_timeout((void*) req);
extern void tws_timeout(void *arg);