1 #ifndef __IPC_NAMESPACE_H__
2 #define __IPC_NAMESPACE_H__
6 #include <linux/rwsem.h>
7 #include <linux/notifier.h>
10 * ipc namespace events
12 #define IPCNS_MEMCHANGED 0x00000001 /* Notify lowmem size changed */
13 #define IPCNS_CREATED 0x00000002 /* Notify new ipc namespace created */
14 #define IPCNS_REMOVED 0x00000003 /* Notify ipc namespace removed */
16 #define IPCNS_CALLBACK_PRI 0
22 unsigned short seq_max;
23 struct rw_semaphore rw_mutex;
27 struct ipc_namespace {
29 struct ipc_ids ids[3];
46 struct notifier_block ipcns_nb;
49 extern struct ipc_namespace init_ipc_ns;
50 extern atomic_t nr_ipc_ns;
53 #define INIT_IPC_NS(ns) .ns = &init_ipc_ns,
55 extern int register_ipcns_notifier(struct ipc_namespace *);
56 extern int cond_register_ipcns_notifier(struct ipc_namespace *);
57 extern void unregister_ipcns_notifier(struct ipc_namespace *);
58 extern int ipcns_notify(unsigned long);
60 #else /* CONFIG_SYSVIPC */
61 #define INIT_IPC_NS(ns)
62 #endif /* CONFIG_SYSVIPC */
64 #if defined(CONFIG_SYSVIPC) && defined(CONFIG_IPC_NS)
65 extern void free_ipc_ns(struct kref *kref);
66 extern struct ipc_namespace *copy_ipcs(unsigned long flags,
67 struct ipc_namespace *ns);
68 extern void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids,
69 void (*free)(struct ipc_namespace *,
70 struct kern_ipc_perm *));
72 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
79 static inline void put_ipc_ns(struct ipc_namespace *ns)
81 kref_put(&ns->kref, free_ipc_ns);
84 static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
85 struct ipc_namespace *ns)
87 if (flags & CLONE_NEWIPC)
88 return ERR_PTR(-EINVAL);
93 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
98 static inline void put_ipc_ns(struct ipc_namespace *ns)