[root@brunojcm-fedora ~]# btrfs filesystem show failed to open /dev/sr0: No medium found Label: 'fedora' uuid: 077370f6-d8b8-4be8-8cbb-2a13fb5244ac
Total devices 1 FS bytes used 5.99GB
devid 1 size 20.14GB used 11.52GB path /dev/sda3
Btrfs v0.20-rc1
I would bet it's btrfs related, as a lot of people have reported success on this procedure.