1 #ifndef __IPC_NAMESPACE_H__
2 #define __IPC_NAMESPACE_H__
3
4 #include <linux/err.h>
5 #include <linux/idr.h>
6 #include <linux/rwsem.h>
7 #include <linux/notifier.h>
8
9 /*
10 * ipc namespace events
11 */
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 */
15
16 #define IPCNS_CALLBACK_PRI 0
17
18
19 struct ipc_ids {
20 int in_use;
21 unsigned short seq;
22 unsigned short seq_max;
23 struct rw_semaphore rw_mutex;
24 struct idr ipcs_idr;
25 };
26
27 struct ipc_namespace {
28 atomic_t count;
29 struct ipc_ids ids[3];
30
31 int sem_ctls[4];
32 int used_sems;
33
34 int msg_ctlmax;
35 int msg_ctlmnb;
36 int msg_ctlmni;
37 atomic_t msg_bytes;
38 atomic_t msg_hdrs;
39 int auto_msgmni;
40
41 size_t shm_ctlmax;
42 size_t shm_ctlall;
43 int shm_ctlmni;
44 int shm_tot;
45
46 struct notifier_block ipcns_nb;
47
48 /* The kern_mount of the mqueuefs sb. We take a ref on it */
49 struct vfsmount *mq_mnt;
50
51 /* # queues in this ns, protected by mq_lock */
52 unsigned int mq_queues_count;
53
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 */
58
59 };
60
61 extern struct ipc_namespace init_ipc_ns;
62 extern atomic_t nr_ipc_ns;
63
64 extern spinlock_t mq_lock;
65 #if defined(CONFIG_POSIX_MQUEUE) || defined(CONFIG_SYSVIPC)
66 #define INIT_IPC_NS(ns) .ns = &init_ipc_ns,
67 #else
68 #define INIT_IPC_NS(ns)
69 #endif
70
71 #ifdef CONFIG_SYSVIPC
72 extern int register_ipcns_notifier(struct ipc_namespace *);
73 extern int cond_register_ipcns_notifier(struct ipc_namespace *);
74 extern void unregister_ipcns_notifier(struct ipc_namespace *);
75 extern int ipcns_notify(unsigned long);
76 #else /* CONFIG_SYSVIPC */
77 static inline int register_ipcns_notifier(struct ipc_namespace *ns)
78 { return 0; }
79 static inline int cond_register_ipcns_notifier(struct ipc_namespace *ns)
80 { return 0; }
81 static inline void unregister_ipcns_notifier(struct ipc_namespace *ns) { }
82 static inline int ipcns_notify(unsigned long l) { return 0; }
83 #endif /* CONFIG_SYSVIPC */
84
85 #ifdef CONFIG_POSIX_MQUEUE
86 extern int mq_init_ns(struct ipc_namespace *ns);
87 /* default values */
88 #define DFLT_QUEUESMAX 256 /* max number of message queues */
89 #define DFLT_MSGMAX 10 /* max number of messages in each queue */
90 #define HARD_MSGMAX (131072/sizeof(void *))
91 #define DFLT_MSGSIZEMAX 8192 /* max message size */
92 #else
93 static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; }
94 #endif
95
96 #if defined(CONFIG_IPC_NS)
97 extern struct ipc_namespace *copy_ipcs(unsigned long flags,
98 struct ipc_namespace *ns);
99 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
100 {
101 if (ns)
102 atomic_inc(&ns->count);
103 return ns;
104 }
105
106 extern void put_ipc_ns(struct ipc_namespace *ns);
107 #else
108 static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
109 struct ipc_namespace *ns)
110 {
111 if (flags & CLONE_NEWIPC)
112 return ERR_PTR(-EINVAL);
113
114 return ns;
115 }
116
117 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
118 {
119 return ns;
120 }
121
122 static inline void put_ipc_ns(struct ipc_namespace *ns)
123 {
124 }
125 #endif
126
127 #ifdef CONFIG_POSIX_MQUEUE_SYSCTL
128
129 struct ctl_table_header;
130 extern struct ctl_table_header *mq_register_sysctl_table(void);
131
132 #else /* CONFIG_POSIX_MQUEUE_SYSCTL */
133
134 static inline struct ctl_table_header *mq_register_sysctl_table(void)
135 {
136 return NULL;
137 }
138
139 #endif /* CONFIG_POSIX_MQUEUE_SYSCTL */
140 #endif
141
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