[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/bug.h>
#include <linux/mm.h>
#include <linux/workqueue.h>
#include <linux/threads.h>
#include <linux/nsproxy.h>
#include <linux/kref.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 bsd_acct_struct;

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 bsd_acct_struct *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 */
	unsigned int proc_inum;
};

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>
aa5a6662 SB	11
	12	struct pidmap {
	13	atomic_t nr_free;
	14	void *page;
	15	};
	16
5cc54451 RC	17	#define BITS_PER_PAGE (PAGE_SIZE * 8)
	18	#define BITS_PER_PAGE_MASK (BITS_PER_PAGE-1)
	19	#define PIDMAP_ENTRIES ((PID_MAX_LIMIT+BITS_PER_PAGE-1)/BITS_PER_PAGE)
aa5a6662	20
20fad13a PE	21	struct bsd_acct_struct;
20fad13a PE	22
61a58c6c	23	struct pid_namespace {
9a575a92 CLG	24	struct kref kref;
9a575a92 CLG	25	struct pidmap pidmap[PIDMAP_ENTRIES];
1adfcb03	26	struct rcu_head rcu;
9a575a92	27	int last_pid;
c876ad76	28	unsigned int nr_hashed;
84d73786	29	struct task_struct *child_reaper;
baf8f0f8	30	struct kmem_cache *pid_cachep;
caafa432	31	unsigned int level;
faacbfd3	32	struct pid_namespace *parent;
07543f5c PE	33	#ifdef CONFIG_PROC_FS
07543f5c PE	34	struct vfsmount *proc_mnt;
021ada7d	35	struct dentry *proc_self;
0097875b	36	struct dentry *proc_thread_self;
07543f5c	37	#endif
20fad13a PE	38	#ifdef CONFIG_BSD_PROCESS_ACCT
	39	struct bsd_acct_struct *bacct;
	40	#endif
49f4d8b9	41	struct user_namespace *user_ns;
0a01f2cc	42	struct work_struct proc_work;
dcb0f222	43	kgid_t pid_gid;
0499680a	44	int hide_pid;
cf3f8921	45	int reboot; /* group exit code if this pidns was rebooted */
98f842e6	46	unsigned int proc_inum;
3fbc9648 SB	47	};
3fbc9648 SB	48
61a58c6c	49	extern struct pid_namespace init_pid_ns;
3fbc9648	50
c876ad76 EB	51	#define PIDNS_HASH_ADDING (1U << 31)
c876ad76 EB	52
57d5f66b	53	#ifdef CONFIG_PID_NS
a05f7b15	54	static inline struct pid_namespace get_pid_ns(struct pid_namespace ns)
9a575a92	55	{
b461cc03 PE	56	if (ns != &init_pid_ns)
b461cc03 PE	57	kref_get(&ns->kref);
a05f7b15	58	return ns;
9a575a92 CLG	59	}
9a575a92 CLG	60
49f4d8b9 EB	61	extern struct pid_namespace *copy_pid_ns(unsigned long flags,
49f4d8b9 EB	62	struct user_namespace user_ns, struct pid_namespace ns);
74bd59bb	63	extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
cf3f8921	64	extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
bbc2e3ef	65	extern void put_pid_ns(struct pid_namespace *ns);
9a575a92	66
57d5f66b EB	67	#else /* !CONFIG_PID_NS */
	68	#include <linux/err.h>
	69
	70	static inline struct pid_namespace get_pid_ns(struct pid_namespace ns)
	71	{
	72	return ns;
	73	}
	74
49f4d8b9 EB	75	static inline struct pid_namespace *copy_pid_ns(unsigned long flags,
49f4d8b9 EB	76	struct user_namespace user_ns, struct pid_namespace ns)
57d5f66b EB	77	{
	78	if (flags & CLONE_NEWPID)
	79	ns = ERR_PTR(-EINVAL);
	80	return ns;
	81	}
	82
	83	static inline void put_pid_ns(struct pid_namespace *ns)
	84	{
	85	}
	86
74bd59bb PE	87	static inline void zap_pid_ns_processes(struct pid_namespace *ns)
	88	{
	89	BUG();
	90	}
cf3f8921 DL	91
	92	static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
	93	{
	94	return 0;
	95	}
57d5f66b EB	96	#endif /* CONFIG_PID_NS */
57d5f66b EB	97
61bce0f1	98	extern struct pid_namespace task_active_pid_ns(struct task_struct tsk);
3ae4eed3 AB	99	void pidhash_init(void);
	100	void pidmap_init(void);
	101
61a58c6c	102	#endif /* _LINUX_PID_NS_H */