VT_TMPFS
if ((vp = bp->b_vp) != NULL && vp->v_tag == VT_TMPFS)
if (vp->v_tag == VT_TMPFS)
else if (bp->b_vp && bp->b_vp->v_tag == VT_TMPFS)
error = getnewvnode(VT_TMPFS, mp, &vp,
case VT_TMPFS: