Description
src/webapps/datanode/browseDirectory.jsp
File f = new File(dir);
String parent;
if ((parent = f.getParent()) != null)
out.print("<a href=\"" + req.getRequestURL() + "?dir=" + parent +
"&namenodeInfoPort=" + namenodeInfoPort +
"\">Go to parent directory</a><br>");
File.getParent() return separator "\" not "/"