--- linux-4.9.37/fs/yaffs2/yaffs_nameval.h	1970-01-01 03:00:00.000000000 +0300
+++ linux-4.9.y/fs/yaffs2/yaffs_nameval.h	2021-06-07 13:01:34.000000000 +0300
@@ -0,0 +1,33 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __NAMEVAL_H__
+#define __NAMEVAL_H__
+
+#include "yportenv.h"
+
+struct yaffs_dev;
+
+int nval_del(struct yaffs_dev *dev, char *xb, int xb_size, const YCHAR * name);
+int nval_set(struct yaffs_dev *dev,
+	     char *xb, int xb_size, const YCHAR * name, const char *buf,
+	     int bsize, int flags);
+int nval_get(struct yaffs_dev *dev,
+	     const char *xb, int xb_size, const YCHAR * name, char *buf,
+	     int bsize);
+int nval_list(struct yaffs_dev *dev,
+	      const char *xb, int xb_size, char *buf, int bsize);
+int nval_hasvalues(struct yaffs_dev *dev, const char *xb, int xb_size);
+#endif