--- /dev/null
+#ifndef _NAMESPACE_H_
+#define _NAMESPACE_H_
+#ifdef __KERNEL__
+
+struct mnt_namespace;
+struct fs_struct;
+struct user_namespace;
+
+extern struct mnt_namespace *copy_mnt_ns(unsigned long, struct mnt_namespace *,
+ struct user_namespace *, struct fs_struct *);
+extern void put_mnt_ns(struct mnt_namespace *ns);
+
+extern const struct file_operations proc_mounts_operations;
+extern const struct file_operations proc_mountinfo_operations;
+extern const struct file_operations proc_mountstats_operations;
+
+#endif
+#endif