rails routes for permalink with namespaced class

Question

this one in my routes works perfectly:

map.connect ':permalink', :controller => 'pages', :action => 'show'

for this class:

class PagesController < BackendController and on /xxx/pages it is shown like this:

<%= link_to "#{item.link_name}", {:controller => :pages, :action => :show, :permalink => item.permalink} %>

which will generate a link like "how-to-create-permalinks". but i decided to move the PagesController into a subdirectory so the class is now written like so:

class Backend::PagesController < BackendController

But how does the route look like now? And how do i display it on the template so it links using the permalink?

Thanks!