diff options
Diffstat (limited to 'include/net/net_namespace.h')
| -rw-r--r-- | include/net/net_namespace.h | 34 |
1 files changed, 30 insertions, 4 deletions
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h index f306b2aa15a4..09e30bdc7876 100644 --- a/include/net/net_namespace.h +++ b/include/net/net_namespace.h @@ -40,7 +40,7 @@ struct net_device; struct sock; struct ctl_table_header; struct net_generic; -struct sock; +struct uevent_sock; struct netns_ipvs; @@ -59,8 +59,12 @@ struct net { atomic64_t cookie_gen; struct list_head list; /* list of network namespaces */ - struct list_head cleanup_list; /* namespaces on death row */ - struct list_head exit_list; /* Use only net_mutex */ + struct list_head exit_list; /* To linked to call pernet exit + * methods on dead net (net_sem + * read locked), or to unregister + * pernet ops (net_sem wr locked). + */ + struct llist_node cleanup_list; /* namespaces on death row */ struct user_namespace *user_ns; /* Owning user namespace */ struct ucounts *ucounts; @@ -79,6 +83,8 @@ struct net { struct sock *rtnl; /* rtnetlink socket */ struct sock *genl_sock; + struct uevent_sock *uevent_sock; /* uevent socket */ + struct list_head dev_base_head; struct hlist_head *dev_name_head; struct hlist_head *dev_index_head; @@ -89,7 +95,7 @@ struct net { /* core fib_rules */ struct list_head rules_ops; - struct list_head fib_notifier_ops; /* protected by net_mutex */ + struct list_head fib_notifier_ops; /* protected by net_sem */ struct net_device *loopback_dev; /* The loopback */ struct netns_core core; @@ -308,11 +314,31 @@ struct net *get_net_ns_by_id(struct net *net, int id); struct pernet_operations { struct list_head list; + /* + * Below methods are called without any exclusive locks. + * More than one net may be constructed and destructed + * in parallel on several cpus. Every pernet_operations + * have to keep in mind all other pernet_operations and + * to introduce a locking, if they share common resources. + * + * Exit methods using blocking RCU primitives, such as + * synchronize_rcu(), should be implemented via exit_batch. + * Then, destruction of a group of net requires single + * synchronize_rcu() related to these pernet_operations, + * instead of separate synchronize_rcu() for every net. + * Please, avoid synchronize_rcu() at all, where it's possible. + */ int (*init)(struct net *net); void (*exit)(struct net *net); void (*exit_batch)(struct list_head *net_exit_list); unsigned int *id; size_t size; + /* + * Indicates above methods are allowed to be executed in parallel + * with methods of any other pernet_operations, i.e. they are not + * need write locked net_sem. + */ + bool async; }; /* |