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;
48 /* The kern_mount of the mqueuefs sb. We take a ref on it */
49 struct vfsmount *mq_mnt;
51 /* # queues in this ns, protected by mq_lock */
52 unsigned int mq_queues_count;
54 /* next fields are set through sysctl */
55 unsigned int mq_queues_max; /* initialized to DFLT_QUEUESMAX */
56 unsigned int mq_msg_max; /* initialized to DFLT_MSGMAX */
57 unsigned int mq_msgsize_max; /* initialized to DFLT_MSGSIZEMAX */
61 extern struct ipc_namespace init_ipc_ns;
62 extern atomic_t nr_ipc_ns;
64 #if defined(CONFIG_POSIX_MQUEUE) || defined(CONFIG_SYSVIPC)
65 #define INIT_IPC_NS(ns) .ns = &init_ipc_ns,
67 #define INIT_IPC_NS(ns)
71 extern int register_ipcns_notifier(struct ipc_namespace *);
72 extern int cond_register_ipcns_notifier(struct ipc_namespace *);
73 extern void unregister_ipcns_notifier(struct ipc_namespace *);
74 extern int ipcns_notify(unsigned long);
75 #else /* CONFIG_SYSVIPC */
76 static inline int register_ipcns_notifier(struct ipc_namespace *ns)
78 static inline int cond_register_ipcns_notifier(struct ipc_namespace *ns)
80 static inline void unregister_ipcns_notifier(struct ipc_namespace *ns) { }
81 static inline int ipcns_notify(unsigned long l) { return 0; }
82 #endif /* CONFIG_SYSVIPC */
84 #ifdef CONFIG_POSIX_MQUEUE
85 extern void mq_init_ns(struct ipc_namespace *ns);
87 #define DFLT_QUEUESMAX 256 /* max number of message queues */
88 #define DFLT_MSGMAX 10 /* max number of messages in each queue */
89 #define HARD_MSGMAX (131072/sizeof(void *))
90 #define DFLT_MSGSIZEMAX 8192 /* max message size */
92 #define mq_init_ns(ns) ((void) 0)
95 #if defined(CONFIG_IPC_NS)
96 extern void free_ipc_ns(struct kref *kref);
97 extern struct ipc_namespace *copy_ipcs(unsigned long flags,
98 struct ipc_namespace *ns);
99 extern void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids,
100 void (*free)(struct ipc_namespace *,
101 struct kern_ipc_perm *));
103 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
110 static inline void put_ipc_ns(struct ipc_namespace *ns)
112 kref_put(&ns->kref, free_ipc_ns);
115 static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
116 struct ipc_namespace *ns)
118 if (flags & CLONE_NEWIPC)
119 return ERR_PTR(-EINVAL);
124 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
129 static inline void put_ipc_ns(struct ipc_namespace *ns)