[NET] NETNS: Omit sock->sk_net without CONFIG_NET_NS.
Introduce per-sock inlines: sock_net(), sock_net_set()
and per-inet_timewait_sock inlines: twsk_net(), twsk_net_set().
Without CONFIG_NET_NS, no namespace other than &init_net exists.
Let's explicitly define them to help compiler optimizations.
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
diff --git a/include/net/sock.h b/include/net/sock.h
index b433b1e..7e0d4a0 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -126,7 +126,9 @@
atomic_t skc_refcnt;
unsigned int skc_hash;
struct proto *skc_prot;
+#ifdef CONFIG_NET_NS
struct net *skc_net;
+#endif
};
/**
@@ -1345,6 +1347,24 @@
}
#endif
+static inline
+struct net *sock_net(const struct sock *sk)
+{
+#ifdef CONFIG_NET_NS
+ return sk->sk_net;
+#else
+ return &init_net;
+#endif
+}
+
+static inline
+void sock_net_set(struct sock *sk, const struct net *net)
+{
+#ifdef CONFIG_NET_NS
+ sk->sk_net = net;
+#endif
+}
+
/*
* Kernel sockets, f.e. rtnl or icmp_socket, are a part of a namespace.
* They should not hold a referrence to a namespace in order to allow
@@ -1353,8 +1373,8 @@
*/
static inline void sk_change_net(struct sock *sk, struct net *net)
{
- put_net(sk->sk_net);
- sk->sk_net = net;
+ put_net(sock_net(sk));
+ sock_net_set(sk, net);
}
extern void sock_enable_timestamp(struct sock *sk);