diff --git a/components/dfs/filesystems/jffs2/dfs_jffs2.c b/components/dfs/filesystems/jffs2/dfs_jffs2.c
index 176f7c65f03f5b48c70f226861eff88570cf03ec..5c06149a8ce624bfbdfd02e8ac4250ca6f2ca7c1 100644
--- a/components/dfs/filesystems/jffs2/dfs_jffs2.c
+++ b/components/dfs/filesystems/jffs2/dfs_jffs2.c
@@ -438,10 +438,12 @@ static int dfs_jffs2_lseek(struct dfs_fd* file,
 	jffs2_file = (cyg_file *)(file->data);		
 	
 	/* set offset as current offset */
-	jffs2_file_lseek(jffs2_file, &offset, SEEK_SET);
+	result = jffs2_file_lseek(jffs2_file, &offset, SEEK_SET);
 	if (result)
 		return jffs2_result_to_dfs(result);
-	return 0;
+	/* update file position */
+	file->pos = offset;
+	return offset;
 }
 
 /* return the size of  struct dirent*/
diff --git a/components/dfs/src/dfs_posix.c b/components/dfs/src/dfs_posix.c
index 14ce10fa7abb569329e9c8ab9fba57da10893422..f9608e4ac592bd626acace6cb97d8dede186775e 100644
--- a/components/dfs/src/dfs_posix.c
+++ b/components/dfs/src/dfs_posix.c
@@ -199,11 +199,16 @@ off_t lseek(int fd, off_t offset, int whence)
 	case DFS_SEEK_END:
 		offset += d->size;
 		break;
+
+	default:
+		rt_set_errno(-DFS_STATUS_EINVAL);
+		return -1;
+
 	}
 
 	if (offset < 0)
 	{
-		rt_set_errno(DFS_STATUS_EINVAL);
+		rt_set_errno(-DFS_STATUS_EINVAL);
 		return -1;
 	}
 	result = dfs_file_lseek(d, offset);