1 #ifndef _LINUX_PID_NS_H 2 #define _LINUX_PID_NS_H 3 4 #include <linux/sched.h> 5 #include <linux/mm.h> 6 #include <linux/threads.h> 7 #include <linux/pid.h> 8 #include <linux/nsproxy.h> 9 #include <linux/kref.h> 10 11 struct 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 18 struct pid_namespace { 19 struct kref kref; 20 struct pidmap pidmap[PIDMAP_ENTRIES]; 21 int last_pid; 22 struct task_struct *child_reaper; 23 }; 24 25 extern struct pid_namespace init_pid_ns; 26 27 static inline void get_pid_ns(struct pid_namespace *ns) 28 { 29 kref_get(&ns->kref); 30 } 31 32 extern int copy_pid_ns(int flags, struct task_struct *tsk); 33 extern void free_pid_ns(struct kref *kref); 34 35 static inline void put_pid_ns(struct pid_namespace *ns) 36 { 37 kref_put(&ns->kref, free_pid_ns); 38 } 39 40 static inline struct task_struct *child_reaper(struct task_struct *tsk) 41 { 42 return init_pid_ns.child_reaper; 43 } 44 45 #endif /* _LINUX_PID_NS_H */ 46