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review.linaro.org / kernel / linux-linaro-stable.git / 41ef4eb8eef8d06bc1399e7b00c940d771554711 / . / include / linux / pid_namespace.h
blob: 731e4ecee3bd59186b780253bb3bde660593a2f5 [file] [log] [blame]
Sukadev Bhattiprolu61a58c62006-12-08 02:37:58 -0800[diff] [blame]1#ifndef _LINUX_PID_NS_H
2#define _LINUX_PID_NS_H
Sukadev Bhattiproluaa5a6662006-10-02 02:17:23 -0700[diff] [blame]3
4#include <linux/sched.h>
Paul Gortmaker187f1882011-11-23 20:12:59 -0500[diff] [blame]5#include <linux/bug.h>
Sukadev Bhattiproluaa5a6662006-10-02 02:17:23 -0700[diff] [blame]6#include <linux/mm.h>
7#include <linux/threads.h>
Cedric Le Goater9a575a92006-12-08 02:37:59 -0800[diff] [blame]8#include <linux/nsproxy.h>
9#include <linux/kref.h>
Sukadev Bhattiproluaa5a6662006-10-02 02:17:23 -0700[diff] [blame]10
11struct pidmap {
12 atomic_t nr_free;
13 void *page;
14};
15
Raphael S.Carvalho5cc54452013-04-30 15:28:27 -0700[diff] [blame]16#define BITS_PER_PAGE (PAGE_SIZE * 8)
17#define BITS_PER_PAGE_MASK (BITS_PER_PAGE-1)
18#define PIDMAP_ENTRIES ((PID_MAX_LIMIT+BITS_PER_PAGE-1)/BITS_PER_PAGE)
Sukadev Bhattiproluaa5a6662006-10-02 02:17:23 -0700[diff] [blame]19
Pavel Emelyanov20fad132008-07-25 01:48:43 -0700[diff] [blame]20struct bsd_acct_struct;
21
Sukadev Bhattiprolu61a58c62006-12-08 02:37:58 -0800[diff] [blame]22struct pid_namespace {
Cedric Le Goater9a575a92006-12-08 02:37:59 -0800[diff] [blame]23 struct kref kref;
24 struct pidmap pidmap[PIDMAP_ENTRIES];
25 int last_pid;
Eric W. Biedermanc876ad762012-12-21 20:27:12 -0800[diff] [blame]26 unsigned int nr_hashed;
Sukadev Bhattiprolu84d73782006-12-08 02:38:01 -0800[diff] [blame]27 struct task_struct *child_reaper;
Pavel Emelianovbaf8f0f2007-10-18 23:39:48 -0700[diff] [blame]28 struct kmem_cache *pid_cachep;
Pavel Emelyanovcaafa432008-04-30 00:54:31 -0700[diff] [blame]29 unsigned int level;
Pavel Emelyanovfaacbfd2007-10-18 23:40:04 -0700[diff] [blame]30 struct pid_namespace *parent;
Pavel Emelyanov07543f52007-10-18 23:40:08 -0700[diff] [blame]31#ifdef CONFIG_PROC_FS
32 struct vfsmount *proc_mnt;
Al Viro021ada72013-03-29 19:27:05 -0400[diff] [blame]33 struct dentry *proc_self;
Pavel Emelyanov07543f52007-10-18 23:40:08 -0700[diff] [blame]34#endif
Pavel Emelyanov20fad132008-07-25 01:48:43 -0700[diff] [blame]35#ifdef CONFIG_BSD_PROCESS_ACCT
36 struct bsd_acct_struct *bacct;
37#endif
Eric W. Biederman49f4d8b2012-08-02 04:25:10 -0700[diff] [blame]38 struct user_namespace *user_ns;
Eric W. Biederman0a01f2c2012-08-01 10:33:47 -0700[diff] [blame]39 struct work_struct proc_work;
Eric W. Biedermandcb0f222012-02-09 08:48:21 -0800[diff] [blame]40 kgid_t pid_gid;
Vasiliy Kulikov04996802012-01-10 15:11:31 -0800[diff] [blame]41 int hide_pid;
Daniel Lezcanocf3f8922012-03-28 14:42:51 -0700[diff] [blame]42 int reboot; /* group exit code if this pidns was rebooted */
Eric W. Biederman98f842e2011-06-15 10:21:48 -0700[diff] [blame]43 unsigned int proc_inum;
Sukadev Bhattiprolu3fbc9642006-10-02 02:17:24 -0700[diff] [blame]44};
45
Sukadev Bhattiprolu61a58c62006-12-08 02:37:58 -0800[diff] [blame]46extern struct pid_namespace init_pid_ns;
Sukadev Bhattiprolu3fbc9642006-10-02 02:17:24 -0700[diff] [blame]47
Eric W. Biedermanc876ad762012-12-21 20:27:12 -0800[diff] [blame]48#define PIDNS_HASH_ADDING (1U << 31)
49
Eric W. Biederman57d5f662007-11-14 17:00:13 -0800[diff] [blame]50#ifdef CONFIG_PID_NS
Pavel Emelianova05f7b12007-10-18 23:39:47 -0700[diff] [blame]51static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
Cedric Le Goater9a575a92006-12-08 02:37:59 -0800[diff] [blame]52{
Pavel Emelyanovb461cc02007-10-18 23:40:09 -0700[diff] [blame]53 if (ns != &init_pid_ns)
54 kref_get(&ns->kref);
Pavel Emelianova05f7b12007-10-18 23:39:47 -0700[diff] [blame]55 return ns;
Cedric Le Goater9a575a92006-12-08 02:37:59 -0800[diff] [blame]56}
57
Eric W. Biederman49f4d8b2012-08-02 04:25:10 -0700[diff] [blame]58extern struct pid_namespace *copy_pid_ns(unsigned long flags,
59 struct user_namespace *user_ns, struct pid_namespace *ns);
Pavel Emelyanov74bd59b2008-02-08 04:18:24 -0800[diff] [blame]60extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
Daniel Lezcanocf3f8922012-03-28 14:42:51 -0700[diff] [blame]61extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
Cyrill Gorcunovbbc2e3e2012-10-19 13:56:53 -0700[diff] [blame]62extern void put_pid_ns(struct pid_namespace *ns);
Cedric Le Goater9a575a92006-12-08 02:37:59 -0800[diff] [blame]63
Eric W. Biederman57d5f662007-11-14 17:00:13 -0800[diff] [blame]64#else /* !CONFIG_PID_NS */
65#include <linux/err.h>
66
67static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
68{
69 return ns;
70}
71
Eric W. Biederman49f4d8b2012-08-02 04:25:10 -0700[diff] [blame]72static inline struct pid_namespace *copy_pid_ns(unsigned long flags,
73 struct user_namespace *user_ns, struct pid_namespace *ns)
Eric W. Biederman57d5f662007-11-14 17:00:13 -0800[diff] [blame]74{
75 if (flags & CLONE_NEWPID)
76 ns = ERR_PTR(-EINVAL);
77 return ns;
78}
79
80static inline void put_pid_ns(struct pid_namespace *ns)
81{
82}
83
Pavel Emelyanov74bd59b2008-02-08 04:18:24 -0800[diff] [blame]84static inline void zap_pid_ns_processes(struct pid_namespace *ns)
85{
86 BUG();
87}
Daniel Lezcanocf3f8922012-03-28 14:42:51 -0700[diff] [blame]88
89static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
90{
91 return 0;
92}
Eric W. Biederman57d5f662007-11-14 17:00:13 -0800[diff] [blame]93#endif /* CONFIG_PID_NS */
94
Eric W. Biederman61bce0f2009-01-07 18:08:49 -0800[diff] [blame]95extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
Adrian Bunk3ae4eed2008-07-25 01:48:34 -0700[diff] [blame]96void pidhash_init(void);
97void pidmap_init(void);
98
Sukadev Bhattiprolu61a58c62006-12-08 02:37:58 -0800[diff] [blame]99#endif /* _LINUX_PID_NS_H */