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 40 size_t shm_ctlmax; 41 size_t shm_ctlall; 42 int shm_ctlmni; 43 int shm_tot; 44 45 struct notifier_block ipcns_nb; 46 }; 47 48 extern struct ipc_namespace init_ipc_ns; 49 extern atomic_t nr_ipc_ns; 50 51 #ifdef CONFIG_SYSVIPC 52 #define INIT_IPC_NS(ns) .ns = &init_ipc_ns, 53 54 extern int register_ipcns_notifier(struct ipc_namespace *); 55 extern int cond_register_ipcns_notifier(struct ipc_namespace *); 56 extern int unregister_ipcns_notifier(struct ipc_namespace *); 57 extern int ipcns_notify(unsigned long); 58 59 #else /* CONFIG_SYSVIPC */ 60 #define INIT_IPC_NS(ns) 61 #endif /* CONFIG_SYSVIPC */ 62 63 #if defined(CONFIG_SYSVIPC) && defined(CONFIG_IPC_NS) 64 extern void free_ipc_ns(struct kref *kref); 65 extern struct ipc_namespace *copy_ipcs(unsigned long flags, 66 struct ipc_namespace *ns); 67 extern void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids, 68 void (*free)(struct ipc_namespace *, 69 struct kern_ipc_perm *)); 70 71 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) 72 { 73 if (ns) 74 kref_get(&ns->kref); 75 return ns; 76 } 77 78 static inline void put_ipc_ns(struct ipc_namespace *ns) 79 { 80 kref_put(&ns->kref, free_ipc_ns); 81 } 82 #else 83 static inline struct ipc_namespace *copy_ipcs(unsigned long flags, 84 struct ipc_namespace *ns) 85 { 86 if (flags & CLONE_NEWIPC) 87 return ERR_PTR(-EINVAL); 88 89 return ns; 90 } 91 92 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) 93 { 94 return ns; 95 } 96 97 static inline void put_ipc_ns(struct ipc_namespace *ns) 98 { 99 } 100 #endif 101 #endif 102