--- udisks-2.0.91.orig/src/udiskslinuxfilesystem.c
+++ udisks-2.0.91/src/udiskslinuxfilesystem.c
@@ -298,7 +298,7 @@ static const gchar *iso9660_allow_gid_se
 /* ---------------------- udf -------------------- */
 
 static const gchar *udf_defaults[] = { "uid=", "gid=", "iocharset=utf8", "umask=0077", NULL };
-static const gchar *udf_allow[] = { "iocharset=", "umask=", NULL };
+static const gchar *udf_allow[] = { "iocharset=", "umask=", "mode=", "dmode=", NULL };
 static const gchar *udf_allow_uid_self[] = { "uid=", NULL };
 static const gchar *udf_allow_gid_self[] = { "gid=", NULL };
 
@@ -512,7 +512,8 @@ is_mount_option_allowed (const FSMountOp
 }
 
 static gchar **
-prepend_default_mount_options (const FSMountOptions *fsmo,
+prepend_default_mount_options (UDisksBlock *block,
+                               const FSMountOptions *fsmo,
                                uid_t                 caller_uid,
                                GVariant             *given_options)
 {
@@ -520,6 +521,8 @@ prepend_default_mount_options (const FSM
   gint n;
   gchar *s;
   gid_t gid;
+  const gchar *probed_fs_type;
+  /* static default options from FSMountOptions */
   const gchar *option_string;
 
   options = g_ptr_array_new ();
@@ -552,6 +555,17 @@ prepend_default_mount_options (const FSM
         }
     }
 
+  /* dynamic default options */
+  /* some broken DVDs come with 0400 directory permissions, making them
+   * unreadable; overwrite readonly UDF media with a 0500 dmode. */
+  probed_fs_type = udisks_block_get_id_type(block);
+  if (g_strcmp0 (probed_fs_type, "udf") == 0 &&
+      udisks_block_get_read_only(block))
+    {
+      g_ptr_array_add (options, g_strdup("dmode=0500"));
+    }
+
+  /* user supplied options */
   if (g_variant_lookup (given_options,
                         "options",
                         "&s", &option_string))
@@ -709,7 +723,7 @@ calculate_mount_options (UDisksDaemon
   /* always prepend some reasonable default mount options; these are
    * chosen here; the user can override them if he wants to
    */
-  options_to_use = prepend_default_mount_options (fsmo, caller_uid, options);
+  options_to_use = prepend_default_mount_options (block, fsmo, caller_uid, options);
 
   /* validate mount options */
   str = g_string_new ("uhelper=udisks2,nodev,nosuid");