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 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 }; 26 27 struct ipc_namespace { 28 struct kref kref; 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 49 extern struct ipc_namespace init_ipc_ns; 50 extern atomic_t nr_ipc_ns; 51 52 #ifdef CONFIG_SYSVIPC 53 #define INIT_IPC_NS(ns) .ns = &init_ipc_ns, 54 55 extern int register_ipcns_notifier(struct ipc_namespace *); 56 extern int cond_register_ipcns_notifier(struct ipc_namespace *); 57 extern void unregister_ipcns_notifier(struct ipc_namespace *); 58 extern int ipcns_notify(unsigned long); 59 60 #else /* CONFIG_SYSVIPC */ 61 #define INIT_IPC_NS(ns) 62 #endif /* CONFIG_SYSVIPC */ 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, 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 *)); 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 103