? disk_free_space.patch
Index: services/fs_drupal/storage_fs_drupal.module
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/storage_api/services/fs_drupal/storage_fs_drupal.module,v
retrieving revision 1.1.4.1.2.1
diff -u -p -r1.1.4.1.2.1 storage_fs_drupal.module
--- services/fs_drupal/storage_fs_drupal.module	27 Aug 2009 12:16:39 -0000	1.1.4.1.2.1
+++ services/fs_drupal/storage_fs_drupal.module	5 Nov 2009 17:23:12 -0000
@@ -74,7 +74,9 @@ function storage_fs_drupal_storage_conta
 function storage_fs_drupal_storage_container_info($container) {
 
   $info['Directory path'] = $container['settings']['path'];
-  $info['Free space'] = format_size(disk_free_space($container['settings']['path']));
+  if (function_exists('disk_free_space')) {
+    $info['Free space'] = format_size(disk_free_space($container['settings']['path']));
+  }
 
   return $info;
 }