add an option to jump relatvie dir '.' and '..' in jffs2

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1943 bbd45198-f89e-11dd-88c7-29a3b14d5316

components/dfs/filesystems/jffs2/dfs_jffs2.c

@@ -287,8 +287,12 @@ static int dfs_jffs2_open(struct dfs_fd* file)
 		/* open dir */
 		result = jffs2_opendir(mte, mte->root, name, jffs2_file);
 		if (result)
+		{
 			return jffs2_result_to_dfs(result);			
-		
+		}
+#ifdef  CONFIG_JFFS2_NO_RELATIVEDIR
+		jffs2_file->f_offset = 2;
+#endif
 		/* save this pointer, it will be used by dfs_jffs2_getdents*/
 		file->data = jffs2_file;
 		return 0;

components/dfs/filesystems/jffs2/jffs2_config.h

@@ -7,6 +7,18 @@
 
 #define DEVICE_PART_MAX   1  /* the max partions on a nand deivce*/
 
+
+/* jffs2 support relative dir, command "ls" will get
+ * +-------------------------------+
+ * |   finsh>>ls("/")              |
+ * |   Directory /:              |
+ * |   .                   <DIR>   |
+ * |   ..                  <DIR>   |
+ * |   dir1                <DIR>   |
+ * +-------------------------------+
+ */
+#define CONFIG_JFFS2_NO_RELATIVEDIR
+
 #define CYGPKG_FS_JFFS2_RET_DIRENT_DTYPE /* should be enabled */
 #if defined(CYGPKG_FS_JFFS2_RET_DIRENT_DTYPE)
 	#define CYGPKG_FILEIO_DIRENT_DTYPE