lf_advlock
error = lf_advlock(ap, &(vp->v_lockf), size);
error = lf_advlock(ap, &vp->v_lockf, size);
lf_advlock(ap, &vp->v_lockf, size);
lf_advlock(ap, &vp->v_lockf, size);
error = lf_advlock(ap, &vp->v_lockf, size);
return (lf_advlock(ap, &(vp->v_lockf), vattr.va_size));
int lf_advlock(struct vop_advlock_args *, struct lockf **, u_quad_t);