[deliverable/linux.git] / include / linux / pid_namespace.h

#ifndef _LINUX_PID_NS_H
#define _LINUX_PID_NS_H

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

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

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

struct fs_pin;

struct pid_namespace {
	struct kref kref;
	struct pidmap pidmap[PIDMAP_ENTRIES];
	struct rcu_head rcu;
	int last_pid;
	unsigned int nr_hashed;
	struct task_struct *child_reaper;
	struct kmem_cache *pid_cachep;
	unsigned int level;
	struct pid_namespace *parent;
#ifdef CONFIG_PROC_FS
	struct vfsmount *proc_mnt;
	struct dentry *proc_self;
	struct dentry *proc_thread_self;
#endif
#ifdef CONFIG_BSD_PROCESS_ACCT
	struct fs_pin *bacct;
#endif
	struct user_namespace *user_ns;
	struct work_struct proc_work;
	kgid_t pid_gid;
	int hide_pid;
	int reboot;	/* group exit code if this pidns was rebooted */
	struct ns_common ns;
};

extern struct pid_namespace init_pid_ns;

#define PIDNS_HASH_ADDING (1U << 31)

#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 user_namespace *user_ns, struct pid_namespace *ns);
extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
extern void put_pid_ns(struct pid_namespace *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 user_namespace *user_ns, 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();
}

static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
{
	return 0;
}
#endif /* CONFIG_PID_NS */

extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
void pidhash_init(void);
void pidmap_init(void);

#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/bug.h>
	6	#include <linux/mm.h>
	7	#include <linux/workqueue.h>
	8	#include <linux/threads.h>
	9	#include <linux/nsproxy.h>
	10	#include <linux/kref.h>
	11	#include <linux/ns_common.h>
	12
	13	struct pidmap {
	14	atomic_t nr_free;
	15	void *page;
	16	};
	17
	18	#define BITS_PER_PAGE (PAGE_SIZE * 8)
	19	#define BITS_PER_PAGE_MASK (BITS_PER_PAGE-1)
	20	#define PIDMAP_ENTRIES ((PID_MAX_LIMIT+BITS_PER_PAGE-1)/BITS_PER_PAGE)
	21
	22	struct fs_pin;
	23
	24	struct pid_namespace {
	25	struct kref kref;
	26	struct pidmap pidmap[PIDMAP_ENTRIES];
	27	struct rcu_head rcu;
	28	int last_pid;
	29	unsigned int nr_hashed;
	30	struct task_struct *child_reaper;
	31	struct kmem_cache *pid_cachep;
	32	unsigned int level;
	33	struct pid_namespace *parent;
	34	#ifdef CONFIG_PROC_FS
	35	struct vfsmount *proc_mnt;
	36	struct dentry *proc_self;
	37	struct dentry *proc_thread_self;
	38	#endif
	39	#ifdef CONFIG_BSD_PROCESS_ACCT
	40	struct fs_pin *bacct;
	41	#endif
	42	struct user_namespace *user_ns;
	43	struct work_struct proc_work;
	44	kgid_t pid_gid;
	45	int hide_pid;
	46	int reboot; /* group exit code if this pidns was rebooted */
	47	struct ns_common ns;
	48	};
	49
	50	extern struct pid_namespace init_pid_ns;
	51
	52	#define PIDNS_HASH_ADDING (1U << 31)
	53
	54	#ifdef CONFIG_PID_NS
	55	static inline struct pid_namespace get_pid_ns(struct pid_namespace ns)
	56	{
	57	if (ns != &init_pid_ns)
	58	kref_get(&ns->kref);
	59	return ns;
	60	}
	61
	62	extern struct pid_namespace *copy_pid_ns(unsigned long flags,
	63	struct user_namespace user_ns, struct pid_namespace ns);
	64	extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
	65	extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
	66	extern void put_pid_ns(struct pid_namespace *ns);
	67
	68	#else /* !CONFIG_PID_NS */
	69	#include <linux/err.h>
	70
	71	static inline struct pid_namespace get_pid_ns(struct pid_namespace ns)
	72	{
	73	return ns;
	74	}
	75
	76	static inline struct pid_namespace *copy_pid_ns(unsigned long flags,
	77	struct user_namespace user_ns, struct pid_namespace ns)
	78	{
	79	if (flags & CLONE_NEWPID)
	80	ns = ERR_PTR(-EINVAL);
	81	return ns;
	82	}
	83
	84	static inline void put_pid_ns(struct pid_namespace *ns)
	85	{
	86	}
	87
	88	static inline void zap_pid_ns_processes(struct pid_namespace *ns)
	89	{
	90	BUG();
	91	}
	92
	93	static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
	94	{
	95	return 0;
	96	}
	97	#endif /* CONFIG_PID_NS */
	98
	99	extern struct pid_namespace task_active_pid_ns(struct task_struct tsk);
	100	void pidhash_init(void);
	101	void pidmap_init(void);
	102
	103	#endif /* _LINUX_PID_NS_H */