#ifndef __IPC_NAMESPACE_H__ #define __IPC_NAMESPACE_H__ #include <linux/err.h> #include <linux/idr.h> #include <linux/rwsem.h> #include <linux/notifier.h> /* * ipc namespace events */ #define IPCNS_MEMCHANGED 0x00000001 /* Notify lowmem size changed */ #define IPCNS_CREATED 0x00000002 /* Notify new ipc namespace created */ #define IPCNS_REMOVED 0x00000003 /* Notify ipc namespace removed */ #define IPCNS_CALLBACK_PRI 0 struct ipc_ids { int in_use; unsigned short seq; unsigned short seq_max; struct rw_semaphore rw_mutex; struct idr ipcs_idr; }; struct ipc_namespace { atomic_t count; struct ipc_ids ids[3]; int sem_ctls[4]; int used_sems; int msg_ctlmax; int msg_ctlmnb; int msg_ctlmni; atomic_t msg_bytes; atomic_t msg_hdrs; int auto_msgmni; size_t shm_ctlmax; size_t shm_ctlall; int shm_ctlmni; int shm_tot; struct notifier_block ipcns_nb; /* The kern_mount of the mqueuefs sb. We take a ref on it */ struct vfsmount *mq_mnt; /* # queues in this ns, protected by mq_lock */ unsigned int mq_queues_count; /* next fields are set through sysctl */ unsigned int mq_queues_max; /* initialized to DFLT_QUEUESMAX */ unsigned int mq_msg_max; /* initialized to DFLT_MSGMAX */ unsigned int mq_msgsize_max; /* initialized to DFLT_MSGSIZEMAX */ }; extern struct ipc_namespace init_ipc_ns; extern atomic_t nr_ipc_ns; extern spinlock_t mq_lock; #if defined(CONFIG_POSIX_MQUEUE) || defined(CONFIG_SYSVIPC) #define INIT_IPC_NS(ns) .ns = &init_ipc_ns, #else #define INIT_IPC_NS(ns) #endif #ifdef CONFIG_SYSVIPC extern int register_ipcns_notifier(struct ipc_namespace *); extern int cond_register_ipcns_notifier(struct ipc_namespace *); extern void unregister_ipcns_notifier(struct ipc_namespace *); extern int ipcns_notify(unsigned long); #else /* CONFIG_SYSVIPC */ static inline int register_ipcns_notifier(struct ipc_namespace *ns) { return 0; } static inline int cond_register_ipcns_notifier(struct ipc_namespace *ns) { return 0; } static inline void unregister_ipcns_notifier(struct ipc_namespace *ns) { } static inline int ipcns_notify(unsigned long l) { return 0; } #endif /* CONFIG_SYSVIPC */ #ifdef CONFIG_POSIX_MQUEUE extern int mq_init_ns(struct ipc_namespace *ns); /* default values */ #define DFLT_QUEUESMAX 256 /* max number of message queues */ #define DFLT_MSGMAX 10 /* max number of messages in each queue */ #define HARD_MSGMAX (131072/sizeof(void *)) #define DFLT_MSGSIZEMAX 8192 /* max message size */ #else static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; } #endif #if defined(CONFIG_IPC_NS) extern void free_ipc_ns(struct ipc_namespace *ns); extern struct ipc_namespace *copy_ipcs(unsigned long flags, struct ipc_namespace *ns); extern void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids, void (*free)(struct ipc_namespace *, struct kern_ipc_perm *)); static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) { if (ns) atomic_inc(&ns->count); return ns; } extern void put_ipc_ns(struct ipc_namespace *ns); #else static inline struct ipc_namespace *copy_ipcs(unsigned long flags, struct ipc_namespace *ns) { if (flags & CLONE_NEWIPC) return ERR_PTR(-EINVAL); return ns; } static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) { return ns; } static inline void put_ipc_ns(struct ipc_namespace *ns) { } #endif #ifdef CONFIG_POSIX_MQUEUE_SYSCTL struct ctl_table_header; extern struct ctl_table_header *mq_register_sysctl_table(void); #else /* CONFIG_POSIX_MQUEUE_SYSCTL */ static inline struct ctl_table_header *mq_register_sysctl_table(void) { return NULL; } #endif /* CONFIG_POSIX_MQUEUE_SYSCTL */ #endif