[mirror_ubuntu-artful-kernel.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;

enum { /* definitions for pid_namespace's hide_pid field */
	HIDEPID_OFF	  = 0,
	HIDEPID_NO_ACCESS = 1,
	HIDEPID_INVISIBLE = 2,
};

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 ucounts *ucounts;
	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;
} __randomize_layout;

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
61a58c6c SB	1	#ifndef _LINUX_PID_NS_H
61a58c6c SB	2	#define _LINUX_PID_NS_H
aa5a6662 SB	3
aa5a6662 SB	4	#include <linux/sched.h>
187f1882	5	#include <linux/bug.h>
aa5a6662	6	#include <linux/mm.h>
a27bb332	7	#include <linux/workqueue.h>
aa5a6662	8	#include <linux/threads.h>
9a575a92 CLG	9	#include <linux/nsproxy.h>
9a575a92 CLG	10	#include <linux/kref.h>
435d5f4b	11	#include <linux/ns_common.h>
aa5a6662 SB	12
	13	struct pidmap {
	14	atomic_t nr_free;
	15	void *page;
	16	};
	17
5cc54451 RC	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)
aa5a6662	21
59eda0e0	22	struct fs_pin;
20fad13a	23
796f571b LW	24	enum { /* definitions for pid_namespace's hide_pid field */
	25	HIDEPID_OFF = 0,
	26	HIDEPID_NO_ACCESS = 1,
	27	HIDEPID_INVISIBLE = 2,
	28	};
	29
61a58c6c	30	struct pid_namespace {
9a575a92 CLG	31	struct kref kref;
9a575a92 CLG	32	struct pidmap pidmap[PIDMAP_ENTRIES];
1adfcb03	33	struct rcu_head rcu;
9a575a92	34	int last_pid;
c876ad76	35	unsigned int nr_hashed;
84d73786	36	struct task_struct *child_reaper;
baf8f0f8	37	struct kmem_cache *pid_cachep;
caafa432	38	unsigned int level;
faacbfd3	39	struct pid_namespace *parent;
07543f5c PE	40	#ifdef CONFIG_PROC_FS
07543f5c PE	41	struct vfsmount *proc_mnt;
021ada7d	42	struct dentry *proc_self;
0097875b	43	struct dentry *proc_thread_self;
07543f5c	44	#endif
20fad13a	45	#ifdef CONFIG_BSD_PROCESS_ACCT
59eda0e0	46	struct fs_pin *bacct;
20fad13a	47	#endif
49f4d8b9	48	struct user_namespace *user_ns;
f333c700	49	struct ucounts *ucounts;
0a01f2cc	50	struct work_struct proc_work;
dcb0f222	51	kgid_t pid_gid;
0499680a	52	int hide_pid;
cf3f8921	53	int reboot; /* group exit code if this pidns was rebooted */
435d5f4b	54	struct ns_common ns;
3859a271	55	} __randomize_layout;
3fbc9648	56
61a58c6c	57	extern struct pid_namespace init_pid_ns;
3fbc9648	58
c876ad76 EB	59	#define PIDNS_HASH_ADDING (1U << 31)
c876ad76 EB	60
57d5f66b	61	#ifdef CONFIG_PID_NS
a05f7b15	62	static inline struct pid_namespace get_pid_ns(struct pid_namespace ns)
9a575a92	63	{
b461cc03 PE	64	if (ns != &init_pid_ns)
b461cc03 PE	65	kref_get(&ns->kref);
a05f7b15	66	return ns;
9a575a92 CLG	67	}
9a575a92 CLG	68
49f4d8b9 EB	69	extern struct pid_namespace *copy_pid_ns(unsigned long flags,
49f4d8b9 EB	70	struct user_namespace user_ns, struct pid_namespace ns);
74bd59bb	71	extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
cf3f8921	72	extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
bbc2e3ef	73	extern void put_pid_ns(struct pid_namespace *ns);
9a575a92	74
57d5f66b EB	75	#else /* !CONFIG_PID_NS */
	76	#include <linux/err.h>
	77
	78	static inline struct pid_namespace get_pid_ns(struct pid_namespace ns)
	79	{
	80	return ns;
	81	}
	82
49f4d8b9 EB	83	static inline struct pid_namespace *copy_pid_ns(unsigned long flags,
49f4d8b9 EB	84	struct user_namespace user_ns, struct pid_namespace ns)
57d5f66b EB	85	{
	86	if (flags & CLONE_NEWPID)
	87	ns = ERR_PTR(-EINVAL);
	88	return ns;
	89	}
	90
	91	static inline void put_pid_ns(struct pid_namespace *ns)
	92	{
	93	}
	94
74bd59bb PE	95	static inline void zap_pid_ns_processes(struct pid_namespace *ns)
	96	{
	97	BUG();
	98	}
cf3f8921 DL	99
	100	static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
	101	{
	102	return 0;
	103	}
57d5f66b EB	104	#endif /* CONFIG_PID_NS */
57d5f66b EB	105
61bce0f1	106	extern struct pid_namespace task_active_pid_ns(struct task_struct tsk);
3ae4eed3 AB	107	void pidhash_init(void);
	108	void pidmap_init(void);
	109
61a58c6c	110	#endif /* _LINUX_PID_NS_H */