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 free_pid_ns(struct kref *kref);
  51extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
  52extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
  53
  54static inline void put_pid_ns(struct pid_namespace *ns)
  55{
  56        if (ns != &init_pid_ns)
  57                kref_put(&ns->kref, free_pid_ns);
  58}
  59
  60#else /* !CONFIG_PID_NS */
  61#include <linux/err.h>
  62
  63static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
  64{
  65        return ns;
  66}
  67
  68static inline struct pid_namespace *
  69copy_pid_ns(unsigned long flags, struct pid_namespace *ns)
  70{
  71        if (flags & CLONE_NEWPID)
  72                ns = ERR_PTR(-EINVAL);
  73        return ns;
  74}
  75
  76static inline void put_pid_ns(struct pid_namespace *ns)
  77{
  78}
  79
  80static inline void zap_pid_ns_processes(struct pid_namespace *ns)
  81{
  82        BUG();
  83}
  84
  85static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
  86{
  87        return 0;
  88}
  89#endif /* CONFIG_PID_NS */
  90
  91extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
  92void pidhash_init(void);
  93void pidmap_init(void);
  94
  95#endif /* _LINUX_PID_NS_H */
  96
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