VMODSORT
vp->v_flag |= VMODSORT;
vp->v_flag |= VMODSORT;
vp->v_flag |= VMODSORT;
vp->v_flag &= ~VMODSORT;
vp->v_flag |= VMODSORT;
(pvn_vmodsort_supported != 0 && ((vp)->v_flag & VMODSORT) != 0)