nfsd4: reshuffle lease-setting code to allow reuse

[safe/jmp/linux-2.6] / include / net / net_namespace.h

diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index 708009b..f307e13 100644 (file)
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -19,12 +19,18 @@
 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
 #include <net/netns/conntrack.h>
 #endif
+#include <net/netns/xfrm.h>
 
 struct proc_dir_entry;
 struct net_device;
 struct sock;
 struct ctl_table_header;
 struct net_generic;
+struct sock;
+
+
+#define NETDEV_HASHBITS    8
+#define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
 
 struct net {
        atomic_t                count;          /* To decided when the network
@@ -36,7 +42,8 @@ struct net {
                                                 */
 #endif
        struct list_head        list;           /* list of network namespaces */
-       struct work_struct      work;           /* work struct for freeing */
+       struct list_head        cleanup_list;   /* namespaces on death row */
+       struct list_head        exit_list;      /* Use only net_mutex */
 
        struct proc_dir_entry   *proc_net;
        struct proc_dir_entry   *proc_net_stat;
@@ -56,6 +63,7 @@ struct net {
        spinlock_t              rules_mod_lock;
 
        struct sock             *rtnl;                  /* rtnetlink socket */
+       struct sock             *genl_sock;
 
        struct netns_core       core;
        struct netns_mib        mib;
@@ -74,6 +82,12 @@ struct net {
        struct netns_ct         ct;
 #endif
 #endif
+#ifdef CONFIG_XFRM
+       struct netns_xfrm       xfrm;
+#endif
+#ifdef CONFIG_WEXT_CORE
+       struct sk_buff_head     wext_nlevents;
+#endif
        struct net_generic      *gen;
 };
 
@@ -102,14 +116,11 @@ static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
 
 extern struct list_head net_namespace_list;
 
+extern struct net *get_net_ns_by_pid(pid_t pid);
+
 #ifdef CONFIG_NET_NS
 extern void __put_net(struct net *net);
 
-static inline int net_alive(struct net *net)
-{
-       return net && atomic_read(&net->count);
-}
-
 static inline struct net *get_net(struct net *net)
 {
        atomic_inc(&net->count);
@@ -141,11 +152,6 @@ int net_eq(const struct net *net1, const struct net *net2)
 }
 #else
 
-static inline int net_alive(struct net *net)
-{
-       return 1;
-}
-
 static inline struct net *get_net(struct net *net)
 {
        return net;
@@ -192,10 +198,31 @@ static inline void release_net(struct net *net)
 }
 #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)
 
+#define for_each_net_rcu(VAR)                          \
+       list_for_each_entry_rcu(VAR, &net_namespace_list, list)
+
 #ifdef CONFIG_NET_NS
 #define __net_init
 #define __net_exit
@@ -210,14 +237,34 @@ struct pernet_operations {
        struct list_head list;
        int (*init)(struct net *net);
        void (*exit)(struct net *net);
+       void (*exit_batch)(struct list_head *net_exit_list);
+       int *id;
+       size_t size;
 };
 
+/*
+ * Use these carefully.  If you implement a network device and it
+ * needs per network namespace operations use device pernet operations,
+ * otherwise use pernet subsys operations.
+ *
+ * Network interfaces need to be removed from a dying netns _before_
+ * subsys notifiers can be called, as most of the network code cleanup
+ * (which is done from subsys notifiers) runs with the assumption that
+ * dev_remove_pack has been called so no new packets will arrive during
+ * and after the cleanup functions have been called.  dev_remove_pack
+ * is not per namespace so instead the guarantee of no more packets
+ * arriving in a network namespace is provided by ensuring that all
+ * network devices and all sockets have left the network namespace
+ * before the cleanup methods are called.
+ *
+ * For the longest time the ipv4 icmp code was registered as a pernet
+ * device which caused kernel oops, and panics during network
+ * namespace cleanup.   So please don't get this wrong.
+ */
 extern int register_pernet_subsys(struct pernet_operations *);
 extern void unregister_pernet_subsys(struct pernet_operations *);
 extern int register_pernet_device(struct pernet_operations *);
 extern void unregister_pernet_device(struct pernet_operations *);
-extern int register_pernet_gen_device(int *id, struct pernet_operations *);
-extern void unregister_pernet_gen_device(int id, struct pernet_operations *);
 
 struct ctl_path;
 struct ctl_table;