swap_anon
ap = swap_anon(vp, off);
ap = swap_anon(vp, off);
*app = swap_anon(pp->p_vnode, pp->p_offset);
extern struct anon *swap_anon(struct vnode *vp, u_offset_t off);
ap = swap_anon(vp, off);
if ((ap = swap_anon(vp, offset)) == NULL) {
if ((ap = swap_anon(vp, off)) != NULL) {
} else if ((ap = swap_anon(vp, offset)) == NULL) {
ap = swap_anon(vp, off);