run_task
void run_task(void *);
usb_init_task(&sc->sc_task, run_task, sc, USB_TASK_TYPE_GENERIC);
run_task(try_mount, mp, afs_cont, cp);
run_task(unmount_node_wrap, mp,
run_task(try_nfsx_mount, m,
extern void run_task(task_fun, void *, cb_fun, void *);