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