I have posted this in the German-debian forum: https://debianforum.de/forum/viewtopic.php?f=9&t=154096 The result was that it still does not work. I have the kernel with version 3.13.33 > According to [0] (and the links in there), this problem has been long > solved. > > [0]http://en.wikipedia.org/wiki/Btrfs#File_system_tree >