Actually I have been looking for just this for several years, even as recently as a few weeks ago I was looking, but only found some commercial btrfs driver. Th

Actually I have been looking for just this for several years, even as recently as a few weeks ago I was looking, but only found some commercial btrfs driver. The idea of unified storage is really nice, you don't have to decide how much each OS gets, and with btrfs you can just plop in another drive and extend onto it to transparently increase storage capacity. On top of that, tings like duplicating steam game assets would probably be a big win.