[linux-2.6-block.git] / include / linux / pid_namespace.h

#ifndef _LINUX_PID_NS_H
#define _LINUX_PID_NS_H

#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/threads.h>
#include <linux/nsproxy.h>
#include <linux/kref.h>

struct pidmap {
       atomic_t nr_free;
       void *page;
};

#define PIDMAP_ENTRIES         ((PID_MAX_LIMIT + 8*PAGE_SIZE - 1)/PAGE_SIZE/8)

struct pid_namespace {
	struct kref kref;
	struct pidmap pidmap[PIDMAP_ENTRIES];
	int last_pid;
	struct task_struct *child_reaper;
	struct kmem_cache *pid_cachep;
	int level;
	struct pid_namespace *parent;
#ifdef CONFIG_PROC_FS
	struct vfsmount *proc_mnt;
#endif
};

extern struct pid_namespace init_pid_ns;

#ifdef CONFIG_PID_NS
static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
{
	if (ns != &init_pid_ns)
		kref_get(&ns->kref);
	return ns;
}

extern struct pid_namespace *copy_pid_ns(unsigned long flags, struct pid_namespace *ns);
extern void free_pid_ns(struct kref *kref);
extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);

static inline void put_pid_ns(struct pid_namespace *ns)
{
	if (ns != &init_pid_ns)
		kref_put(&ns->kref, free_pid_ns);
}

#else /* !CONFIG_PID_NS */
#include <linux/err.h>

static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
{
	return ns;
}

static inline struct pid_namespace *
copy_pid_ns(unsigned long flags, struct pid_namespace *ns)
{
	if (flags & CLONE_NEWPID)
		ns = ERR_PTR(-EINVAL);
	return ns;
}

static inline void put_pid_ns(struct pid_namespace *ns)
{
}


static inline void zap_pid_ns_processes(struct pid_namespace *ns)
{
	BUG();
}
#endif /* CONFIG_PID_NS */

static inline struct pid_namespace *task_active_pid_ns(struct task_struct *tsk)
{
	return tsk->nsproxy->pid_ns;
}

static inline struct task_struct *task_child_reaper(struct task_struct *tsk)
{
	BUG_ON(tsk != current);
	return tsk->nsproxy->pid_ns->child_reaper;
}

#endif /* _LINUX_PID_NS_H */
Commit	Line	Data
	1	#ifndef _LINUX_PID_NS_H
	2	#define _LINUX_PID_NS_H
	3
	4	#include <linux/sched.h>
	5	#include <linux/mm.h>
	6	#include <linux/threads.h>
	7	#include <linux/nsproxy.h>
	8	#include <linux/kref.h>
	9
	10	struct pidmap {
	11	atomic_t nr_free;
	12	void *page;
	13	};
	14
	15	#define PIDMAP_ENTRIES ((PID_MAX_LIMIT + 8*PAGE_SIZE - 1)/PAGE_SIZE/8)
	16
	17	struct pid_namespace {
	18	struct kref kref;
	19	struct pidmap pidmap[PIDMAP_ENTRIES];
	20	int last_pid;
	21	struct task_struct *child_reaper;
	22	struct kmem_cache *pid_cachep;
	23	int level;
	24	struct pid_namespace *parent;
	25	#ifdef CONFIG_PROC_FS
	26	struct vfsmount *proc_mnt;
	27	#endif
	28	};
	29
	30	extern struct pid_namespace init_pid_ns;
	31
	32	#ifdef CONFIG_PID_NS
	33	static inline struct pid_namespace get_pid_ns(struct pid_namespace ns)
	34	{
	35	if (ns != &init_pid_ns)
	36	kref_get(&ns->kref);
	37	return ns;
	38	}
	39
	40	extern struct pid_namespace copy_pid_ns(unsigned long flags, struct pid_namespace ns);
	41	extern void free_pid_ns(struct kref *kref);
	42	extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
	43
	44	static inline void put_pid_ns(struct pid_namespace *ns)
	45	{
	46	if (ns != &init_pid_ns)
	47	kref_put(&ns->kref, free_pid_ns);
	48	}
	49
	50	#else /* !CONFIG_PID_NS */
	51	#include <linux/err.h>
	52
	53	static inline struct pid_namespace get_pid_ns(struct pid_namespace ns)
	54	{
	55	return ns;
	56	}
	57
	58	static inline struct pid_namespace *
	59	copy_pid_ns(unsigned long flags, struct pid_namespace *ns)
	60	{
	61	if (flags & CLONE_NEWPID)
	62	ns = ERR_PTR(-EINVAL);
	63	return ns;
	64	}
	65
	66	static inline void put_pid_ns(struct pid_namespace *ns)
	67	{
	68	}
	69
	70
	71	static inline void zap_pid_ns_processes(struct pid_namespace *ns)
	72	{
	73	BUG();
	74	}
	75	#endif /* CONFIG_PID_NS */
	76
	77	static inline struct pid_namespace task_active_pid_ns(struct task_struct tsk)
	78	{
	79	return tsk->nsproxy->pid_ns;
	80	}
	81
	82	static inline struct task_struct task_child_reaper(struct task_struct tsk)
	83	{
	84	BUG_ON(tsk != current);
	85	return tsk->nsproxy->pid_ns->child_reaper;
	86	}
	87
	88	#endif /* _LINUX_PID_NS_H */