[net-next-2.6.git] / include / linux / ipc_namespace.h

#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;

#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    (32768*sizeof(void *)/4)
#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 struct ipc_namespace *copy_ipcs(unsigned long flags,
				       struct ipc_namespace *ns);
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
Commit	Line	Data
ae5e1b22 PE	1	#ifndef __IPC_NAMESPACE_H__
	2	#define __IPC_NAMESPACE_H__
	3
	4	#include <linux/err.h>
ed2ddbf8 PP	5	#include <linux/idr.h>
ed2ddbf8 PP	6	#include <linux/rwsem.h>
b6b337ad	7	#include <linux/notifier.h>
b6b337ad ND	8
	9	/*
	10	* ipc namespace events
	11	*/
	12	#define IPCNS_MEMCHANGED 0x00000001 /* Notify lowmem size changed */
e2c284d8 ND	13	#define IPCNS_CREATED 0x00000002 /* Notify new ipc namespace created */
e2c284d8 ND	14	#define IPCNS_REMOVED 0x00000003 /* Notify ipc namespace removed */
b6b337ad ND	15
	16	#define IPCNS_CALLBACK_PRI 0
	17
ed2ddbf8 PP	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	};
ae5e1b22	26
ae5e1b22	27	struct ipc_namespace {
7eafd7c7	28	atomic_t count;
ed2ddbf8	29	struct ipc_ids ids[3];
ae5e1b22 PE	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;
9eefe520	39	int auto_msgmni;
ae5e1b22 PE	40
	41	size_t shm_ctlmax;
	42	size_t shm_ctlall;
	43	int shm_ctlmni;
	44	int shm_tot;
b6b337ad	45
b6b337ad	46	struct notifier_block ipcns_nb;
614b84cf SH	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
ae5e1b22 PE	59	};
	60
	61	extern struct ipc_namespace init_ipc_ns;
4d89dc6a	62	extern atomic_t nr_ipc_ns;
ae5e1b22	63
7eafd7c7	64	extern spinlock_t mq_lock;
b6b337ad	65
614b84cf	66	#ifdef CONFIG_SYSVIPC
b6b337ad	67	extern int register_ipcns_notifier(struct ipc_namespace *);
6546bc42	68	extern int cond_register_ipcns_notifier(struct ipc_namespace *);
9eefe520	69	extern void unregister_ipcns_notifier(struct ipc_namespace *);
b6b337ad	70	extern int ipcns_notify(unsigned long);
b6b337ad	71	#else /* CONFIG_SYSVIPC */
614b84cf SH	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; }
b6b337ad	78	#endif /* CONFIG_SYSVIPC */
ae5e1b22	79
614b84cf	80	#ifdef CONFIG_POSIX_MQUEUE
7eafd7c7	81	extern int mq_init_ns(struct ipc_namespace *ns);
614b84cf SH	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 */
9cf18e1d	85	#define HARD_MSGMAX (32768sizeof(void )/4)
614b84cf SH	86	#define DFLT_MSGSIZEMAX 8192 /* max message size */
614b84cf SH	87	#else
7eafd7c7	88	static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; }
614b84cf SH	89	#endif
	90
	91	#if defined(CONFIG_IPC_NS)
ae5e1b22	92	extern struct ipc_namespace *copy_ipcs(unsigned long flags,
01b8b07a	93	struct ipc_namespace *ns);
ae5e1b22 PE	94	static inline struct ipc_namespace get_ipc_ns(struct ipc_namespace ns)
	95	{
	96	if (ns)
7eafd7c7	97	atomic_inc(&ns->count);
ae5e1b22 PE	98	return ns;
	99	}
	100
7eafd7c7	101	extern void put_ipc_ns(struct ipc_namespace *ns);
ae5e1b22 PE	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
bdc8e5f8 SH	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 */
ae5e1b22	135	#endif