kernel 3.15.0-0.rc1.git0.1.fc21.x86_64 btrfs-progs v3.14 One 80GB virtual disk, formatted btrfs by installer and Fedora Rawhide installed to it. Post-install I see: [root@localhost ~]# btrfs fi show Label: 'fedora' uuid: d372e5d1-386f-460c-b036-611469e0155e Total devices 1 FS bytes used 4.00GiB devid 1 size 79.31GiB used 6.04GiB path /dev/sda3 Btrfs v3.14 [root@localhost ~]# btrfs fi df / Data, single: total=4.01GiB, used=3.79GiB System, DUP: total=8.00MiB, used=16.00KiB System, single: total=4.00MiB, used=0.00 Metadata, DUP: total=1.00GiB, used=215.69MiB Metadata, single: total=8.00MiB, used=0.00 unknown, single: total=80.00MiB, used=0.00 What is unknown? Chris Murphy-- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html