LXR linux/include/linux/pid

   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        unsigned int nr_hashed;
  25        struct task_struct *child_reaper;
  26        struct kmem_cache *pid_cachep;
  27        unsigned int level;
  28        struct pid_namespace *parent;
  29#ifdef CONFIG_PROC_FS
  30        struct vfsmount *proc_mnt;
  31#endif
  32#ifdef CONFIG_BSD_PROCESS_ACCT
  33        struct bsd_acct_struct *bacct;
  34#endif
  35        struct user_namespace *user_ns;
  36        struct work_struct proc_work;
  37        kgid_t pid_gid;
  38        int hide_pid;
  39        int reboot;     /* group exit code if this pidns was rebooted */
  40        unsigned int proc_inum;
  41};
  42
  43extern struct pid_namespace init_pid_ns;
  44
  45#define PIDNS_HASH_ADDING (1U << 31)
  46
  47#ifdef CONFIG_PID_NS
  48static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
  49{
  50        if (ns != &init_pid_ns)
  51                kref_get(&ns->kref);
  52        return ns;
  53}
  54
  55extern struct pid_namespace *copy_pid_ns(unsigned long flags,
  56        struct user_namespace *user_ns, struct pid_namespace *ns);
  57extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
  58extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
  59extern void put_pid_ns(struct pid_namespace *ns);
  60
  61#else /* !CONFIG_PID_NS */
  62#include <linux/err.h>
  63
  64static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
  65{
  66        return ns;
  67}
  68
  69static inline struct pid_namespace *copy_pid_ns(unsigned long flags,
  70        struct user_namespace *user_ns, struct pid_namespace *ns)
  71{
  72        if (flags & CLONE_NEWPID)
  73                ns = ERR_PTR(-EINVAL);
  74        return ns;
  75}
  76
  77static inline void put_pid_ns(struct pid_namespace *ns)
  78{
  79}
  80
  81static inline void zap_pid_ns_processes(struct pid_namespace *ns)
  82{
  83        BUG();
  84}
  85
  86static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
  87{
  88        return 0;
  89}
  90#endif /* CONFIG_PID_NS */
  91
  92extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
  93void pidhash_init(void);
  94void pidmap_init(void);
  95
  96#endif /* _LINUX_PID_NS_H */
  97