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 atomic_t count; 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 /* The kern_mount of the mqueuefs sb. We take a ref on it */ 49 struct vfsmount *mq_mnt; 50 51 /* # queues in this ns, protected by mq_lock */ 52 unsigned int mq_queues_count; 53 54 /* next fields are set through sysctl */ 55 unsigned int mq_queues_max; /* initialized to DFLT_QUEUESMAX */ 56 unsigned int mq_msg_max; /* initialized to DFLT_MSGMAX */ 57 unsigned int mq_msgsize_max; /* initialized to DFLT_MSGSIZEMAX */ 58 59 }; 60 61 extern struct ipc_namespace init_ipc_ns; 62 extern atomic_t nr_ipc_ns; 63 64 extern spinlock_t mq_lock; 65 #if defined(CONFIG_POSIX_MQUEUE) || defined(CONFIG_SYSVIPC) 66 #define INIT_IPC_NS(ns) .ns = &init_ipc_ns, 67 #else 68 #define INIT_IPC_NS(ns) 69 #endif 70 71 #ifdef CONFIG_SYSVIPC 72 extern int register_ipcns_notifier(struct ipc_namespace *); 73 extern int cond_register_ipcns_notifier(struct ipc_namespace *); 74 extern void unregister_ipcns_notifier(struct ipc_namespace *); 75 extern int ipcns_notify(unsigned long); 76 #else /* CONFIG_SYSVIPC */ 77 static inline int register_ipcns_notifier(struct ipc_namespace *ns) 78 { return 0; } 79 static inline int cond_register_ipcns_notifier(struct ipc_namespace *ns) 80 { return 0; } 81 static inline void unregister_ipcns_notifier(struct ipc_namespace *ns) { } 82 static inline int ipcns_notify(unsigned long l) { return 0; } 83 #endif /* CONFIG_SYSVIPC */ 84 85 #ifdef CONFIG_POSIX_MQUEUE 86 extern int mq_init_ns(struct ipc_namespace *ns); 87 /* default values */ 88 #define DFLT_QUEUESMAX 256 /* max number of message queues */ 89 #define DFLT_MSGMAX 10 /* max number of messages in each queue */ 90 #define HARD_MSGMAX (32768*sizeof(void *)/4) 91 #define DFLT_MSGSIZEMAX 8192 /* max message size */ 92 #else 93 static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; } 94 #endif 95 96 #if defined(CONFIG_IPC_NS) 97 extern struct ipc_namespace *copy_ipcs(unsigned long flags, 98 struct ipc_namespace *ns); 99 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) 100 { 101 if (ns) 102 atomic_inc(&ns->count); 103 return ns; 104 } 105 106 extern void put_ipc_ns(struct ipc_namespace *ns); 107 #else 108 static inline struct ipc_namespace *copy_ipcs(unsigned long flags, 109 struct ipc_namespace *ns) 110 { 111 if (flags & CLONE_NEWIPC) 112 return ERR_PTR(-EINVAL); 113 114 return ns; 115 } 116 117 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) 118 { 119 return ns; 120 } 121 122 static inline void put_ipc_ns(struct ipc_namespace *ns) 123 { 124 } 125 #endif 126 127 #ifdef CONFIG_POSIX_MQUEUE_SYSCTL 128 129 struct ctl_table_header; 130 extern struct ctl_table_header *mq_register_sysctl_table(void); 131 132 #else /* CONFIG_POSIX_MQUEUE_SYSCTL */ 133 134 static inline struct ctl_table_header *mq_register_sysctl_table(void) 135 { 136 return NULL; 137 } 138 139 #endif /* CONFIG_POSIX_MQUEUE_SYSCTL */ 140 #endif 141