add flush, statfs, mkfs to device file system interface.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@804 bbd45198-f89e-11dd-88c7-29a3b14d5316

components/dfs/include/dfs.h

@@ -0,0 +1,37 @@
+/*
+ * File      : dfs.h
+ * This file is part of Device File System in RT-Thread RTOS
+ * COPYRIGHT (C) 2004-2010, RT-Thread Development Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rt-thread.org/license/LICENSE.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2005-02-22     Bernard      The first version.
+ */
+
+#ifndef __DFS_H__
+#define __DFS_H__
+
+#include <string.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+char* dfs_normalize_path(const char* directory, const char* filename);
+const char* dfs_subdir(const char* directory, const char* filename);
+
+/* FD APIs */
+int fd_new(void);
+struct dfs_fd* fd_get(int fd);
+void fd_put(struct dfs_fd* fd);
+int fd_is_open(const char* pathname);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif