+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);