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#endif
  37#ifdef CONFIG_BSD_PROCESS_ACCT
  38        struct bsd_acct_struct *bacct;
  39#endif
  40        struct user_namespace *user_ns;
  41        struct work_struct proc_work;
  42        kgid_t pid_gid;
  43        int hide_pid;
  44        int reboot;     /* group exit code if this pidns was rebooted */
  45        unsigned int proc_inum;
  46};
  47
  48extern struct pid_namespace init_pid_ns;
  49
  50#define PIDNS_HASH_ADDING (1U << 31)
  51
  52#ifdef CONFIG_PID_NS
  53static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
  54{
  55        if (ns != &init_pid_ns)
  56                kref_get(&ns->kref);
  57        return ns;
  58}
  59
  60extern struct pid_namespace *copy_pid_ns(unsigned long flags,
  61        struct user_namespace *user_ns, struct pid_namespace *ns);
  62extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
  63extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
  64extern void put_pid_ns(struct pid_namespace *ns);
  65
  66#else /* !CONFIG_PID_NS */
  67#include <linux/err.h>
  68
  69static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
  70{
  71        return ns;
  72}
  73
  74static inline struct pid_namespace *copy_pid_ns(unsigned long flags,
  75        struct user_namespace *user_ns, struct pid_namespace *ns)
  76{
  77        if (flags & CLONE_NEWPID)
  78                ns = ERR_PTR(-EINVAL);
  79        return ns;
  80}
  81
  82static inline void put_pid_ns(struct pid_namespace *ns)
  83{
  84}
  85
  86static inline void zap_pid_ns_processes(struct pid_namespace *ns)
  87{
  88        BUG();
  89}
  90
  91static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
  92{
  93        return 0;
  94}
  95#endif /* CONFIG_PID_NS */
  96
  97extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
  98void pidhash_init(void);
  99void pidmap_init(void);
 100
 101#endif /* _LINUX_PID_NS_H */
 102