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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 ND |
7 | #ifdef CONFIG_MEMORY_HOTPLUG |
8 | #include <linux/notifier.h> | |
9 | #endif /* CONFIG_MEMORY_HOTPLUG */ | |
10 | ||
11 | /* | |
12 | * ipc namespace events | |
13 | */ | |
14 | #define IPCNS_MEMCHANGED 0x00000001 /* Notify lowmem size changed */ | |
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; | |
39 | ||
40 | size_t shm_ctlmax; | |
41 | size_t shm_ctlall; | |
42 | int shm_ctlmni; | |
43 | int shm_tot; | |
b6b337ad ND |
44 | |
45 | #ifdef CONFIG_MEMORY_HOTPLUG | |
46 | struct notifier_block ipcns_nb; | |
47 | #endif | |
ae5e1b22 PE |
48 | }; |
49 | ||
50 | extern struct ipc_namespace init_ipc_ns; | |
4d89dc6a | 51 | extern atomic_t nr_ipc_ns; |
ae5e1b22 PE |
52 | |
53 | #ifdef CONFIG_SYSVIPC | |
54 | #define INIT_IPC_NS(ns) .ns = &init_ipc_ns, | |
b6b337ad ND |
55 | |
56 | #ifdef CONFIG_MEMORY_HOTPLUG | |
57 | ||
58 | extern int register_ipcns_notifier(struct ipc_namespace *); | |
59 | extern int unregister_ipcns_notifier(struct ipc_namespace *); | |
60 | extern int ipcns_notify(unsigned long); | |
61 | ||
62 | #else /* CONFIG_MEMORY_HOTPLUG */ | |
63 | ||
64 | static inline int register_ipcns_notifier(struct ipc_namespace *ipcns) | |
65 | { | |
66 | return 0; | |
67 | } | |
68 | static inline int unregister_ipcns_notifier(struct ipc_namespace *ipcns) | |
69 | { | |
70 | return 0; | |
71 | } | |
72 | static inline int ipcns_notify(unsigned long ev) | |
73 | { | |
74 | return 0; | |
75 | } | |
76 | ||
77 | #endif /* CONFIG_MEMORY_HOTPLUG */ | |
78 | ||
79 | #else /* CONFIG_SYSVIPC */ | |
ae5e1b22 | 80 | #define INIT_IPC_NS(ns) |
b6b337ad | 81 | #endif /* CONFIG_SYSVIPC */ |
ae5e1b22 PE |
82 | |
83 | #if defined(CONFIG_SYSVIPC) && defined(CONFIG_IPC_NS) | |
84 | extern void free_ipc_ns(struct kref *kref); | |
85 | extern struct ipc_namespace *copy_ipcs(unsigned long flags, | |
01b8b07a PP |
86 | struct ipc_namespace *ns); |
87 | extern void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids, | |
88 | void (*free)(struct ipc_namespace *, | |
89 | struct kern_ipc_perm *)); | |
ae5e1b22 PE |
90 | |
91 | static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) | |
92 | { | |
93 | if (ns) | |
94 | kref_get(&ns->kref); | |
95 | return ns; | |
96 | } | |
97 | ||
98 | static inline void put_ipc_ns(struct ipc_namespace *ns) | |
99 | { | |
100 | kref_put(&ns->kref, free_ipc_ns); | |
101 | } | |
102 | #else | |
103 | static 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 | ||
112 | static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) | |
113 | { | |
114 | return ns; | |
115 | } | |
116 | ||
117 | static inline void put_ipc_ns(struct ipc_namespace *ns) | |
118 | { | |
119 | } | |
120 | #endif | |
121 | #endif |