Commit | Line | Data |
---|---|---|
ae5e1b22 PE |
1 | #ifndef __IPC_NAMESPACE_H__ |
2 | #define __IPC_NAMESPACE_H__ | |
3 | ||
4 | #include <linux/err.h> | |
ed2ddbf8 PP |
5 | #include <linux/idr.h> |
6 | #include <linux/rwsem.h> | |
b6b337ad | 7 | #include <linux/notifier.h> |
b6b337ad ND |
8 | |
9 | /* | |
10 | * ipc namespace events | |
11 | */ | |
12 | #define IPCNS_MEMCHANGED 0x00000001 /* Notify lowmem size changed */ | |
e2c284d8 ND |
13 | #define IPCNS_CREATED 0x00000002 /* Notify new ipc namespace created */ |
14 | #define IPCNS_REMOVED 0x00000003 /* Notify ipc namespace removed */ | |
b6b337ad ND |
15 | |
16 | #define IPCNS_CALLBACK_PRI 0 | |
17 | ||
ed2ddbf8 PP |
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 | }; | |
ae5e1b22 | 26 | |
ae5e1b22 PE |
27 | struct ipc_namespace { |
28 | struct kref kref; | |
ed2ddbf8 | 29 | struct ipc_ids ids[3]; |
ae5e1b22 PE |
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; | |
9eefe520 | 39 | int auto_msgmni; |
ae5e1b22 PE |
40 | |
41 | size_t shm_ctlmax; | |
42 | size_t shm_ctlall; | |
43 | int shm_ctlmni; | |
44 | int shm_tot; | |
b6b337ad | 45 | |
b6b337ad | 46 | struct notifier_block ipcns_nb; |
ae5e1b22 PE |
47 | }; |
48 | ||
49 | extern struct ipc_namespace init_ipc_ns; | |
4d89dc6a | 50 | extern atomic_t nr_ipc_ns; |
ae5e1b22 PE |
51 | |
52 | #ifdef CONFIG_SYSVIPC | |
53 | #define INIT_IPC_NS(ns) .ns = &init_ipc_ns, | |
b6b337ad | 54 | |
b6b337ad | 55 | extern int register_ipcns_notifier(struct ipc_namespace *); |
6546bc42 | 56 | extern int cond_register_ipcns_notifier(struct ipc_namespace *); |
9eefe520 | 57 | extern void unregister_ipcns_notifier(struct ipc_namespace *); |
b6b337ad ND |
58 | extern int ipcns_notify(unsigned long); |
59 | ||
b6b337ad | 60 | #else /* CONFIG_SYSVIPC */ |
ae5e1b22 | 61 | #define INIT_IPC_NS(ns) |
b6b337ad | 62 | #endif /* CONFIG_SYSVIPC */ |
ae5e1b22 PE |
63 | |
64 | #if defined(CONFIG_SYSVIPC) && defined(CONFIG_IPC_NS) | |
65 | extern void free_ipc_ns(struct kref *kref); | |
66 | extern struct ipc_namespace *copy_ipcs(unsigned long flags, | |
01b8b07a PP |
67 | struct ipc_namespace *ns); |
68 | extern void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids, | |
69 | void (*free)(struct ipc_namespace *, | |
70 | struct kern_ipc_perm *)); | |
ae5e1b22 PE |
71 | |
72 | static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) | |
73 | { | |
74 | if (ns) | |
75 | kref_get(&ns->kref); | |
76 | return ns; | |
77 | } | |
78 | ||
79 | static inline void put_ipc_ns(struct ipc_namespace *ns) | |
80 | { | |
81 | kref_put(&ns->kref, free_ipc_ns); | |
82 | } | |
83 | #else | |
84 | static inline struct ipc_namespace *copy_ipcs(unsigned long flags, | |
85 | struct ipc_namespace *ns) | |
86 | { | |
87 | if (flags & CLONE_NEWIPC) | |
88 | return ERR_PTR(-EINVAL); | |
89 | ||
90 | return ns; | |
91 | } | |
92 | ||
93 | static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) | |
94 | { | |
95 | return ns; | |
96 | } | |
97 | ||
98 | static inline void put_ipc_ns(struct ipc_namespace *ns) | |
99 | { | |
100 | } | |
101 | #endif | |
102 | #endif |