Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
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
19struct 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
27struct 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
61extern struct ipc_namespace init_ipc_ns;
62extern atomic_t nr_ipc_ns;
63
64extern spinlock_t mq_lock;
65
66#ifdef CONFIG_SYSVIPC
67extern int register_ipcns_notifier(struct ipc_namespace *);
68extern int cond_register_ipcns_notifier(struct ipc_namespace *);
69extern void unregister_ipcns_notifier(struct ipc_namespace *);
70extern int ipcns_notify(unsigned long);
71#else /* CONFIG_SYSVIPC */
72static inline int register_ipcns_notifier(struct ipc_namespace *ns)
73{ return 0; }
74static inline int cond_register_ipcns_notifier(struct ipc_namespace *ns)
75{ return 0; }
76static inline void unregister_ipcns_notifier(struct ipc_namespace *ns) { }
77static inline int ipcns_notify(unsigned long l) { return 0; }
78#endif /* CONFIG_SYSVIPC */
79
80#ifdef CONFIG_POSIX_MQUEUE
81extern int mq_init_ns(struct ipc_namespace *ns);
82/* default values */
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 */
87#else
88static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; }
89#endif
90
91#if defined(CONFIG_IPC_NS)
92extern struct ipc_namespace *copy_ipcs(unsigned long flags,
93 struct ipc_namespace *ns);
94static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
95{
96 if (ns)
97 atomic_inc(&ns->count);
98 return ns;
99}
100
101extern void put_ipc_ns(struct ipc_namespace *ns);
102#else
103static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
104 struct ipc_namespace *ns)
105{
106 if (flags & CLONE_NEWIPC)
107 return ERR_PTR(-EINVAL);
108
109 return ns;
110}
111
112static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
113{
114 return ns;
115}
116
117static inline void put_ipc_ns(struct ipc_namespace *ns)
118{
119}
120#endif
121
122#ifdef CONFIG_POSIX_MQUEUE_SYSCTL
123
124struct ctl_table_header;
125extern struct ctl_table_header *mq_register_sysctl_table(void);
126
127#else /* CONFIG_POSIX_MQUEUE_SYSCTL */
128
129static inline struct ctl_table_header *mq_register_sysctl_table(void)
130{
131 return NULL;
132}
133
134#endif /* CONFIG_POSIX_MQUEUE_SYSCTL */
135#endif