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 extern spinlock_t mq_lock;
67 extern int register_ipcns_notifier(struct ipc_namespace *);
68 extern int cond_register_ipcns_notifier(struct ipc_namespace *);
69 extern void unregister_ipcns_notifier(struct ipc_namespace *);
70 extern int ipcns_notify(unsigned long);
71 #else /* CONFIG_SYSVIPC */
72 static inline int register_ipcns_notifier(struct ipc_namespace *ns)
74 static inline int cond_register_ipcns_notifier(struct ipc_namespace *ns)
76 static inline void unregister_ipcns_notifier(struct ipc_namespace *ns) { }
77 static inline int ipcns_notify(unsigned long l) { return 0; }
78 #endif /* CONFIG_SYSVIPC */
80 #ifdef CONFIG_POSIX_MQUEUE
81 extern int mq_init_ns(struct ipc_namespace *ns);
83 #define DFLT_QUEUESMAX 256 /* max number of message queues */
84 #define DFLT_MSGMAX 10 /* max number of messages in each queue */
85 #define HARD_MSGMAX (32768*sizeof(void *)/4)
86 #define DFLT_MSGSIZEMAX 8192 /* max message size */
88 static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; }
91 #if defined(CONFIG_IPC_NS)
92 extern struct ipc_namespace *copy_ipcs(unsigned long flags,
93 struct ipc_namespace *ns);
94 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
97 atomic_inc(&ns->count);
101 extern void put_ipc_ns(struct ipc_namespace *ns);
103 static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
104 struct ipc_namespace *ns)
106 if (flags & CLONE_NEWIPC)
107 return ERR_PTR(-EINVAL);
112 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
117 static inline void put_ipc_ns(struct ipc_namespace *ns)
122 #ifdef CONFIG_POSIX_MQUEUE_SYSCTL
124 struct ctl_table_header;
125 extern struct ctl_table_header *mq_register_sysctl_table(void);
127 #else /* CONFIG_POSIX_MQUEUE_SYSCTL */
129 static inline struct ctl_table_header *mq_register_sysctl_table(void)
134 #endif /* CONFIG_POSIX_MQUEUE_SYSCTL */