1 files changed, 20 insertions, 6 deletions

diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h
index b9a17e08ff0f..0135c76c76c6 100644
--- a/include/linux/pid_namespace.h
+++ b/include/linux/pid_namespace.h
@@ -4,7 +4,6 @@
 #include <linux/sched.h>
 #include <linux/mm.h>
 #include <linux/threads.h>
-#include <linux/pid.h>
 #include <linux/nsproxy.h>
 #include <linux/kref.h>
 
@@ -20,13 +19,21 @@ struct pid_namespace {
         struct pidmap pidmap[PIDMAP_ENTRIES];
         int last_pid;
         struct task_struct *child_reaper;
+        struct kmem_cache *pid_cachep;
+        int level;
+        struct pid_namespace *parent;
+#ifdef CONFIG_PROC_FS
+        struct vfsmount *proc_mnt;
+#endif
 };
 
 extern struct pid_namespace init_pid_ns;
 
-static inline void get_pid_ns(struct pid_namespace *ns)
+static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
 {
-        kref_get(&ns->kref);
+        if (ns != &init_pid_ns)
+                kref_get(&ns->kref);
+        return ns;
 }
 
 extern struct pid_namespace *copy_pid_ns(unsigned long flags, struct pid_namespace *ns);
@@ -34,12 +41,19 @@ extern void free_pid_ns(struct kref *kref);
 
 static inline void put_pid_ns(struct pid_namespace *ns)
 {
-        kref_put(&ns->kref, free_pid_ns);
+        if (ns != &init_pid_ns)
+                kref_put(&ns->kref, free_pid_ns);
 }
 
-static inline struct task_struct *child_reaper(struct task_struct *tsk)
+static inline struct pid_namespace *task_active_pid_ns(struct task_struct *tsk)
 {
-        return init_pid_ns.child_reaper;
+        return tsk->nsproxy->pid_ns;
+}
+
+static inline struct task_struct *task_child_reaper(struct task_struct *tsk)
+{
+        BUG_ON(tsk != current);
+        return tsk->nsproxy->pid_ns->child_reaper;
 }
 
 #endif /* _LINUX_PID_NS_H */