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 66 #ifdef CONFIG_SYSVIPC 67 extern int register_ipcns_notifier(struct ipc_namespace *); 68 extern int cond_register_ipcns_notifier(struct ipc_namespace *); 69 extern void unregister_ipcns_notifier(struct ipc_namespace *); 70 extern int ipcns_notify(unsigned long); 71 #else /* CONFIG_SYSVIPC */ 72 static inline int register_ipcns_notifier(struct ipc_namespace *ns) 73 { return 0; } 74 static inline int cond_register_ipcns_notifier(struct ipc_namespace *ns) 75 { return 0; } 76 static inline void unregister_ipcns_notifier(struct ipc_namespace *ns) { } 77 static inline int ipcns_notify(unsigned long l) { return 0; } 78 #endif /* CONFIG_SYSVIPC */ 79 80 #ifdef CONFIG_POSIX_MQUEUE 81 extern int mq_init_ns(struct ipc_namespace *ns); 82 /* default values */ 83 #define DFLT_QUEUESMAX 256 /* max number of message queues */ 84 #define DFLT_MSGMAX 10 /* max number of messages in each queue */ 85 #define HARD_MSGMAX (32768*sizeof(void *)/4) 86 #define DFLT_MSGSIZEMAX 8192 /* max message size */ 87 #else 88 static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; } 89 #endif 90 91 #if defined(CONFIG_IPC_NS) 92 extern struct ipc_namespace *copy_ipcs(unsigned long flags, 93 struct ipc_namespace *ns); 94 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) 95 { 96 if (ns) 97 atomic_inc(&ns->count); 98 return ns; 99 } 100 101 extern void put_ipc_ns(struct ipc_namespace *ns); 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 121 122 #ifdef CONFIG_POSIX_MQUEUE_SYSCTL 123 124 struct ctl_table_header; 125 extern struct ctl_table_header *mq_register_sysctl_table(void); 126 127 #else /* CONFIG_POSIX_MQUEUE_SYSCTL */ 128 129 static inline struct ctl_table_header *mq_register_sysctl_table(void) 130 { 131 return NULL; 132 } 133 134 #endif /* CONFIG_POSIX_MQUEUE_SYSCTL */ 135 #endif 136