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#ifndef __IPC_NAMESPACE_H__
#define __IPC_NAMESPACE_H__
#include <linux/err.h>
#include <linux/idr.h>
#include <linux/rwsem.h>
#ifdef CONFIG_MEMORY_HOTPLUG
#include <linux/notifier.h>
#endif /* CONFIG_MEMORY_HOTPLUG */
/*
* ipc namespace events
*/
#define IPCNS_MEMCHANGED 0x00000001 /* Notify lowmem size changed */
#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;
#ifdef CONFIG_MEMORY_HOTPLUG
struct notifier_block ipcns_nb;
#endif
};
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,
#ifdef CONFIG_MEMORY_HOTPLUG
extern int register_ipcns_notifier(struct ipc_namespace *);
extern int unregister_ipcns_notifier(struct ipc_namespace *);
extern int ipcns_notify(unsigned long);
#else /* CONFIG_MEMORY_HOTPLUG */
static inline int register_ipcns_notifier(struct ipc_namespace *ipcns)
{
return 0;
}
static inline int unregister_ipcns_notifier(struct ipc_namespace *ipcns)
{
return 0;
}
static inline int ipcns_notify(unsigned long ev)
{
return 0;
}
#endif /* CONFIG_MEMORY_HOTPLUG */
#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
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