+#if defined(CONFIG_EXT4_WRITE)
+extern struct ext2_inode *g_parent_inode;
+extern int gd_index;
+extern int gindex;
+
+int ext4fs_init(void);
+void ext4fs_deinit(void);
+int ext4fs_filename_check(char *filename);
+int ext4fs_write(const char *fname, unsigned char *buffer,
+ unsigned long sizebytes);
+#endif
+