projects / mirror_ubuntu-kernels.git / blame
| 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 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 |