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/workqueue.h>
   8#include <linux/threads.h>
   9#include <linux/nsproxy.h>
  10#include <linux/kref.h>
  11
  12struct pidmap {
  13       atomic_t nr_free;
  14       void *page;
  15};
  16
  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)
  20
  21struct bsd_acct_struct;
  22
  23struct pid_namespace {
  24        struct kref kref;
  25        struct pidmap pidmap[PIDMAP_ENTRIES];
  26        struct rcu_head rcu;
  27        int last_pid;
  28        unsigned int nr_hashed;
  29        struct task_struct *child_reaper;
  30        struct kmem_cache *pid_cachep;
  31        unsigned int level;
  32        struct pid_namespace *parent;
  33#ifdef CONFIG_PROC_FS
  34        struct vfsmount *proc_mnt;
  35        struct dentry *proc_self;
  36        struct dentry *proc_thread_self;
  37#endif
  38#ifdef CONFIG_BSD_PROCESS_ACCT
  39        struct bsd_acct_struct *bacct;
  40#endif
  41        struct user_namespace *user_ns;
  42        struct work_struct proc_work;
  43        kgid_t pid_gid;
  44        int hide_pid;
  45        int reboot;     /* group exit code if this pidns was rebooted */
  46        unsigned int proc_inum;
  47};
  48
  49extern struct pid_namespace init_pid_ns;
  50
  51#define PIDNS_HASH_ADDING (1U << 31)
  52
  53#ifdef CONFIG_PID_NS
  54static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
  55{
  56        if (ns != &init_pid_ns)
  57                kref_get(&ns->kref);
  58        return ns;
  59}
  60
  61extern struct pid_namespace *copy_pid_ns(unsigned long flags,
  62        struct user_namespace *user_ns, struct pid_namespace *ns);
  63extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
  64extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
  65extern void put_pid_ns(struct pid_namespace *ns);
  66
  67#else /* !CONFIG_PID_NS */
  68#include <linux/err.h>
  69
  70static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
  71{
  72        return ns;
  73}
  74
  75static inline struct pid_namespace *copy_pid_ns(unsigned long flags,
  76        struct user_namespace *user_ns, struct pid_namespace *ns)
  77{
  78        if (flags & CLONE_NEWPID)
  79                ns = ERR_PTR(-EINVAL);
  80        return ns;
  81}
  82
  83static inline void put_pid_ns(struct pid_namespace *ns)
  84{
  85}
  86
  87static inline void zap_pid_ns_processes(struct pid_namespace *ns)
  88{
  89        BUG();
  90}
  91
  92static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
  93{
  94        return 0;
  95}
  96#endif /* CONFIG_PID_NS */
  97
  98extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
  99void pidhash_init(void);
 100void pidmap_init(void);
 101
 102#endif /* _LINUX_PID_NS_H */
 103