Restricted contents won't show on the nodes page

I find the restricted contents can still be seen on the rss and the nodes page.
So I did something to hide them.
I implemented hook_node_access_records() and hook_node_grants()
Here are the codes.

/**
 * Implementation of hook_node_access_records().
 */
function restrict_content_node_access_records($node) {  
  if (isset($node->restrict_content_roles)) {        
        foreach ($node->restrict_content_roles as $rid => $role) {       
          if ($role) {
			  $grants[] = array(
                'realm' => 'restrict_content',
                'gid' => $rid,
                'grant_view' => 1,
                'grant_update' => 0,
                'grant_delete' => 0,
                'priority' => 0,
              );			      
          }   
        }
      }          
      return  $grants;
}
/**
 * Implementation of hook_node_grants().
 */
function restrict_content_node_grants($ac, $op) { 
	foreach ($ac->roles as $rid => $role) {		
		$grants['restrict_content'] = array($rid);
    }
    return $grants;
}