diff --git a/components/dfs/filesystems/elmfat/dfs_elm.c b/components/dfs/filesystems/elmfat/dfs_elm.c
index c2143d51a1f370d6475987b7c60f233d256b3d57..ebed2b8b5d53861f62db77f83030e51bdffdb809 100644
--- a/components/dfs/filesystems/elmfat/dfs_elm.c
+++ b/components/dfs/filesystems/elmfat/dfs_elm.c
@@ -228,6 +228,7 @@ int dfs_elm_open(struct dfs_fd* file)
 		mode = FA_READ;
 
 		if (file->flags & DFS_O_WRONLY) mode |= FA_WRITE;
+		if ((file->flags & DFS_O_ACCMODE) & DFS_O_RDWR) mode |= FA_WRITE;
 		/* Opens the file, if it is existing. If not, a new file is created. */
 		if (file->flags & DFS_O_CREAT) mode |= FA_OPEN_ALWAYS;
 		/* Creates a new file. If the file is existing, it is truncated and overwritten. */
@@ -489,7 +490,7 @@ int dfs_elm_rename(struct dfs_filesystem* fs, const char* oldpath, const char* n
 	const char *drivers_oldfn, *drivers_newfn;
 
 	drivers_oldfn = oldpath;
-	drivers_newfn = oldpath;
+	drivers_newfn = newpath;
 #endif
 
 	result = f_rename(drivers_oldfn, drivers_newfn);
diff --git a/components/dfs/filesystems/romfs/dfs_romfs.c b/components/dfs/filesystems/romfs/dfs_romfs.c
index 2f466989040f45a74acd1ac81349f719a002767e..efd74e238bdaf30308f2abcc99e9968f4fa099e4 100644
--- a/components/dfs/filesystems/romfs/dfs_romfs.c
+++ b/components/dfs/filesystems/romfs/dfs_romfs.c
@@ -113,7 +113,7 @@ int dfs_romfs_open(struct dfs_fd* file)
 
 	root_dirent = (struct romfs_dirent*)file->fs->data;
 
-	if (file->flags & DFS_O_CREAT | DFS_O_WRONLY | DFS_O_APPEND | DFS_O_TRUNC)
+	if (file->flags & (DFS_O_CREAT | DFS_O_WRONLY | DFS_O_APPEND | DFS_O_TRUNC | DFS_O_RDWR))
 		return -DFS_STATUS_EINVAL;
 
 	dirent = dfs_romfs_lookup(root_dirent, file->path);
diff --git a/components/dfs/filesystems/uffs/dfs_uffs.c b/components/dfs/filesystems/uffs/dfs_uffs.c
new file mode 100644
index 0000000000000000000000000000000000000000..43ce7d44968e5c9ceb009c1b9473caf6ed3314d8
--- /dev/null
+++ b/components/dfs/filesystems/uffs/dfs_uffs.c
@@ -0,0 +1,92 @@
+#include <rtthread.h>
+#include <dfs.h>
+#include <dfs_fs.h>
+
+/* mount and unmount file system */
+static int dfs_uffs_mount(struct dfs_filesystem* fs, unsigned long rwflag, const void* data)
+{
+}
+
+static int dfs_uffs_unmount(struct dfs_filesystem* fs)
+{
+}
+
+static int dfs_uffs_mkfs(const char* device_name)
+{
+	return -DFS_STATUS_EIO;
+}
+
+static int dfs_uffs_statfs(struct dfs_filesystem* fs, struct _statfs *buf)
+{
+}
+
+static int dfs_uffs_open(struct dfs_fd* fd)
+{
+}
+
+static int dfs_uffs_close(struct dfs_fd* fd)
+{
+}
+
+static int dfs_uffs_ioctl(struct dfs_fd* fd, int cmd, void *args)
+{
+}
+
+static int dfs_uffs_read(struct dfs_fd* fd, void* buf, rt_size_t count)
+{
+}
+
+static int dfs_uffs_write(struct dfs_fd* fd, const void* buf, rt_size_t count)
+{
+}
+
+static int dfs_uffs_flush(struct dfs_fd* fd)
+{
+}
+
+static int dfs_uffs_lseek(struct dfs_fd* fd, rt_off_t offset)
+{
+}
+
+static int dfs_uffs_getdents(struct dfs_fd* fd, struct _dirent* dirp, rt_uint32_t count)
+{
+}
+
+static int dfs_uffs_unlink(struct dfs_filesystem* fs, const char* pathname)
+{
+}
+
+static int dfs_uffs_stat(struct dfs_filesystem* fs, const char* filename, struct _stat* buf)
+{
+}
+
+static int dfs_uffs_rename(struct dfs_filesystem* fs, const char* oldpath, const char* newpath)
+{
+}
+
+static const struct dfs_filesystem_operation _uffs = 
+{
+	"uffs",
+	dfs_uffs_mount,
+	dfs_uffs_unmount,
+	dfs_uffs_mkfs,
+	dfs_uffs_statfs,
+
+	dfs_uffs_open,
+	dfs_uffs_close,
+	dfs_uffs_ioctl,
+	dfs_uffs_read,
+	dfs_uffs_write,
+	dfs_uffs_flush,
+	dfs_uffs_lseek,
+	dfs_uffs_getdents,
+	dfs_uffs_unlink,
+	dfs_uffs_stat,
+	dfs_uffs_rename,
+};
+
+int dfs_uffs_init(void)
+{
+    /* register UFFS file system */
+    return dfs_register(&_uffs);
+}
diff --git a/components/dfs/filesystems/uffs/dfs_uffs.h b/components/dfs/filesystems/uffs/dfs_uffs.h
new file mode 100644
index 0000000000000000000000000000000000000000..0f6d497c7cd96a6abeeebad6d9afa8a78898f88d
--- /dev/null
+++ b/components/dfs/filesystems/uffs/dfs_uffs.h
@@ -0,0 +1,20 @@
+/*
+ * File      : dfs_uffs.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
+ * 2010-09-02     Bernard      The first version.
+ */
+
+#ifndef __DFS_UFFS_H__
+#define __DFS_UFFS_H__
+
+int dfs_uffs_init(void);
+
+#endif