net: Introduce read_pnet() and write_pnet() helpers

This patch introduces two helpers that deal with reading and writing struct net pointers in various network structures. Their implementation depends on CONFIG_NET_NS For symmetry, both functions work with "struct net **pnet". Their usage should reduce the number of #ifdef CONFIG_NET_NS, without adding many helpers for each network structure that hold a "struct net *pointer" Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: David S. Miller <davem@davemloft.net>

net: Introduce read_pnet() and write_pnet() helpers
This patch introduces two helpers that deal with reading and writing struct net pointers in various network structures. Their implementation depends on CONFIG_NET_NS For symmetry, both functions work with "struct net **pnet". Their usage should reduce the number of #ifdef CONFIG_NET_NS, without adding many helpers for each network structure that hold a "struct net *pointer" Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Eric Dumazet · David S. Miller
1 parent 9eca0a47de
Showing 1 changed file with 18 additions and 0 deletions Side-by-side Diff
include/net/net_namespace.h
@@ -192,6 +192,24 @@
 }
 #endif
  
+#ifdef CONFIG_NET_NS
+
+static inline void write_pnet(struct net **pnet, struct net *net)
+{
+	*pnet = net;
+}
+
+static inline struct net *read_pnet(struct net * const *pnet)
+{
+	return *pnet;
+}
+
+#else
+
+#define write_pnet(pnet, net)	do { (void)(net);} while (0)
+#define read_pnet(pnet)		(&init_net)
+
+#endif
  
 #define for_each_net(VAR)				\
 	list_for_each_entry(VAR, &net_namespace_list, list)
...	...	@@ -192,6 +192,24 @@
192	192	}
193	193	#endif
194	194
	195	+#ifdef CONFIG_NET_NS
	196	+
	197	+static inline void write_pnet(struct net *pnet, struct net net)
	198	+{
	199	+ *pnet = net;
	200	+}
	201	+
	202	+static inline struct net read_pnet(struct net const *pnet)
	203	+{
	204	+ return *pnet;
	205	+}
	206	+
	207	+#else
	208	+
	209	+#define write_pnet(pnet, net) do { (void)(net);} while (0)
	210	+#define read_pnet(pnet) (&init_net)
	211	+
	212	+#endif
195	213
196	214	#define for_each_net(VAR) \
197	215	list_for_each_entry(VAR, &net_namespace_list, list)