#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 { struct kref kref; 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; size_t shm_ctlmax; size_t shm_ctlall; int shm_ctlmni; int shm_tot; struct notifier_block ipcns_nb; }; extern struct ipc_namespace init_ipc_ns; extern atomic_t nr_ipc_ns; #ifdef CONFIG_SYSVIPC #define INIT_IPC_NS(ns) .ns = &init_ipc_ns, extern int register_ipcns_notifier(struct ipc_namespace *); extern int cond_register_ipcns_notifier(struct ipc_namespace *); extern int unregister_ipcns_notifier(struct ipc_namespace *); extern int ipcns_notify(unsigned long); #else /* CONFIG_SYSVIPC */ #define INIT_IPC_NS(ns) #endif /* CONFIG_SYSVIPC */ #if defined(CONFIG_SYSVIPC) && defined(CONFIG_IPC_NS) extern void free_ipc_ns(struct kref *kref); 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) kref_get(&ns->kref); return ns; } static inline void put_ipc_ns(struct ipc_namespace *ns) { kref_put(&ns->kref, free_ipc_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 #endif