inet: Kill FLOWI_FLAG_PRECOW_METRICS.

No longer needed. TCP writes metrics, but now in it's own special
cache that does not dirty the route metrics. Therefore there is no
longer any reason to pre-cow metrics in this way.

Signed-off-by: David S. Miller <[e-mail]>

include/net/flow.h

···
 	__u8	flowic_proto;
 	__u8	flowic_flags;
 #define FLOWI_FLAG_ANYSRC		0x01
-#define FLOWI_FLAG_PRECOW_METRICS	0x02
-#define FLOWI_FLAG_CAN_SLEEP		0x04
-#define FLOWI_FLAG_RT_NOCACHE		0x08
+#define FLOWI_FLAG_CAN_SLEEP		0x02
+#define FLOWI_FLAG_RT_NOCACHE		0x04
 	__u32	flowic_secid;
 };
 

include/net/inet_sock.h

···
 
 	if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl)
 		flags |= FLOWI_FLAG_ANYSRC;
-	if (sk->sk_protocol == IPPROTO_TCP)
-		flags |= FLOWI_FLAG_PRECOW_METRICS;
 	return flags;
 }
 

include/net/route.h

···
 
 	if (inet_sk(sk)->transparent)
 		flow_flags |= FLOWI_FLAG_ANYSRC;
-	if (protocol == IPPROTO_TCP)
-		flow_flags |= FLOWI_FLAG_PRECOW_METRICS;
 	if (can_sleep)
 		flow_flags |= FLOWI_FLAG_CAN_SLEEP;
 

net/ipv4/inet_connection_sock.c

···
 	const struct inet_request_sock *ireq = inet_rsk(req);
 	struct ip_options_rcu *opt = inet_rsk(req)->opt;
 	struct net *net = sock_net(sk);
-	int flags = inet_sk_flowi_flags(sk) & ~FLOWI_FLAG_PRECOW_METRICS;
+	int flags = inet_sk_flowi_flags(sk);
 
 	if (nocache)
 		flags |= FLOWI_FLAG_RT_NOCACHE;

net/ipv4/route.c

···
 	struct rtable *rt;
 
 	flowi4_init_output(&fl4, oif, mark, RT_TOS(iph->tos), RT_SCOPE_UNIVERSE,
-			   protocol, flow_flags | FLOWI_FLAG_PRECOW_METRICS,
+			   protocol, flow_flags,
 			   iph->daddr, iph->saddr, 0, 0);
 	rt = __ip_route_output_key(net, &fl4);
 	if (!IS_ERR(rt)) {
···
 {
 	struct inet_peer_base *base;
 	struct inet_peer *peer;
-	int create = 0;
-
-	/* If a peer entry exists for this destination, we must hook
-	 * it up in order to get at cached metrics.
-	 */
-	if (fl4 && (fl4->flowi4_flags & FLOWI_FLAG_PRECOW_METRICS))
-		create = 1;
 
 	base = inetpeer_base_ptr(rt->_peer);
 	BUG_ON(!base);
 
-	peer = inet_getpeer_v4(base, rt->rt_dst, create);
+	peer = inet_getpeer_v4(base, rt->rt_dst, 0);
 	if (peer) {
 		__rt_set_peer(rt, peer);
 		rt->rt_peer_genid = rt_peer_genid();

net/ipv6/route.c

···
 	memset(&fl6, 0, sizeof(fl6));
 	fl6.flowi6_oif = oif;
 	fl6.flowi6_mark = mark;
-	fl6.flowi6_flags = FLOWI_FLAG_PRECOW_METRICS;
+	fl6.flowi6_flags = 0;
 	fl6.daddr = iph->daddr;
 	fl6.saddr = iph->saddr;
 	fl6.flowlabel = (*(__be32 *) iph) & IPV6_FLOWINFO_MASK;