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