1 files changed, 42 insertions, 0 deletions

diff --git a/include/linux/namespace.h b/include/linux/namespace.h
new file mode 100644
index 000000000000..9eca1558d72f
--- /dev/null
+++ b/include/linux/namespace.h
@@ -0,0 +1,42 @@
+#ifndef _NAMESPACE_H_
+#define _NAMESPACE_H_
+#ifdef __KERNEL__
+
+#include <linux/mount.h>
+#include <linux/sched.h>
+
+struct namespace {
+        atomic_t                count;
+        struct vfsmount *       root;
+        struct list_head        list;
+        struct rw_semaphore     sem;
+};
+
+extern void umount_tree(struct vfsmount *);
+extern int copy_namespace(int, struct task_struct *);
+extern void __put_namespace(struct namespace *namespace);
+
+static inline void put_namespace(struct namespace *namespace)
+{
+        if (atomic_dec_and_test(&namespace->count))
+                __put_namespace(namespace);
+}
+
+static inline void exit_namespace(struct task_struct *p)
+{
+        struct namespace *namespace = p->namespace;
+        if (namespace) {
+                task_lock(p);
+                p->namespace = NULL;
+                task_unlock(p);
+                put_namespace(namespace);
+        }
+}
+
+static inline void get_namespace(struct namespace *namespace)
+{
+        atomic_inc(&namespace->count);
+}
+
+#endif
+#endif