Use dentry_path() to create full path to inode object
[pohmelfs.git] / include / linux / ipc_namespace.h
blob8a297a5e794cc8e51c22351098b80a35ce43ef09
1 #ifndef __IPC_NAMESPACE_H__
2 #define __IPC_NAMESPACE_H__
4 #include <linux/err.h>
5 #include <linux/idr.h>
6 #include <linux/rwsem.h>
7 #include <linux/notifier.h>
8 #include <linux/nsproxy.h>
11 * ipc namespace events
13 #define IPCNS_MEMCHANGED 0x00000001 /* Notify lowmem size changed */
14 #define IPCNS_CREATED 0x00000002 /* Notify new ipc namespace created */
15 #define IPCNS_REMOVED 0x00000003 /* Notify ipc namespace removed */
17 #define IPCNS_CALLBACK_PRI 0
19 struct user_namespace;
21 struct ipc_ids {
22 int in_use;
23 unsigned short seq;
24 unsigned short seq_max;
25 struct rw_semaphore rw_mutex;
26 struct idr ipcs_idr;
29 struct ipc_namespace {
30 atomic_t count;
31 struct ipc_ids ids[3];
33 int sem_ctls[4];
34 int used_sems;
36 int msg_ctlmax;
37 int msg_ctlmnb;
38 int msg_ctlmni;
39 atomic_t msg_bytes;
40 atomic_t msg_hdrs;
41 int auto_msgmni;
43 size_t shm_ctlmax;
44 size_t shm_ctlall;
45 int shm_ctlmni;
46 int shm_tot;
48 * Defines whether IPC_RMID is forced for _all_ shm segments regardless
49 * of shmctl()
51 int shm_rmid_forced;
53 struct notifier_block ipcns_nb;
55 /* The kern_mount of the mqueuefs sb. We take a ref on it */
56 struct vfsmount *mq_mnt;
58 /* # queues in this ns, protected by mq_lock */
59 unsigned int mq_queues_count;
61 /* next fields are set through sysctl */
62 unsigned int mq_queues_max; /* initialized to DFLT_QUEUESMAX */
63 unsigned int mq_msg_max; /* initialized to DFLT_MSGMAX */
64 unsigned int mq_msgsize_max; /* initialized to DFLT_MSGSIZEMAX */
66 /* user_ns which owns the ipc ns */
67 struct user_namespace *user_ns;
70 extern struct ipc_namespace init_ipc_ns;
71 extern atomic_t nr_ipc_ns;
73 extern spinlock_t mq_lock;
75 #ifdef CONFIG_SYSVIPC
76 extern int register_ipcns_notifier(struct ipc_namespace *);
77 extern int cond_register_ipcns_notifier(struct ipc_namespace *);
78 extern void unregister_ipcns_notifier(struct ipc_namespace *);
79 extern int ipcns_notify(unsigned long);
80 extern void shm_destroy_orphaned(struct ipc_namespace *ns);
81 #else /* CONFIG_SYSVIPC */
82 static inline int register_ipcns_notifier(struct ipc_namespace *ns)
83 { return 0; }
84 static inline int cond_register_ipcns_notifier(struct ipc_namespace *ns)
85 { return 0; }
86 static inline void unregister_ipcns_notifier(struct ipc_namespace *ns) { }
87 static inline int ipcns_notify(unsigned long l) { return 0; }
88 static inline void shm_destroy_orphaned(struct ipc_namespace *ns) {}
89 #endif /* CONFIG_SYSVIPC */
91 #ifdef CONFIG_POSIX_MQUEUE
92 extern int mq_init_ns(struct ipc_namespace *ns);
93 /* default values */
94 #define DFLT_QUEUESMAX 256 /* max number of message queues */
95 #define DFLT_MSGMAX 10 /* max number of messages in each queue */
96 #define HARD_MSGMAX (32768*sizeof(void *)/4)
97 #define DFLT_MSGSIZEMAX 8192 /* max message size */
98 #else
99 static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; }
100 #endif
102 #if defined(CONFIG_IPC_NS)
103 extern struct ipc_namespace *copy_ipcs(unsigned long flags,
104 struct task_struct *tsk);
105 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
107 if (ns)
108 atomic_inc(&ns->count);
109 return ns;
112 extern void put_ipc_ns(struct ipc_namespace *ns);
113 #else
114 static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
115 struct task_struct *tsk)
117 if (flags & CLONE_NEWIPC)
118 return ERR_PTR(-EINVAL);
120 return tsk->nsproxy->ipc_ns;
123 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
125 return ns;
128 static inline void put_ipc_ns(struct ipc_namespace *ns)
131 #endif
133 #ifdef CONFIG_POSIX_MQUEUE_SYSCTL
135 struct ctl_table_header;
136 extern struct ctl_table_header *mq_register_sysctl_table(void);
138 #else /* CONFIG_POSIX_MQUEUE_SYSCTL */
140 static inline struct ctl_table_header *mq_register_sysctl_table(void)
142 return NULL;
145 #endif /* CONFIG_POSIX_MQUEUE_SYSCTL */
146 #endif