Doesn't seem to be supported in 5.0.1, but we should support it, https://btrfs.wiki.kernel.org/index.php/FAQ#Does_btrfs_support_encryption.3F
# start disk config disk_config sda disklabel:gpt-bios bootable:1 fstabkey:uuid primary /boot 500 ext4 rw primary swap 2048 swap sw primary - 0- - - disk_config cryptsetup luks:"test" - /dev/sda3 - - disk_config btrfs fstabkey:uuid btrfs single / sda3 noatime,subvol=@/ # end disk config In the end of the format.log: (CMD) mkfs.btrfs -d single -f /dev/sda3 1> /tmp/gLiXor74AQ 2> /tmp/tC6Plj0DrR Executing: mkfs.btrfs -d single -f /dev/sda3 (STDERR) Error: unable to open /dev/sda3: Device or resource busy (STDERR) Error: unable to open /dev/sda3: Device or resource busy Command had non-zero exit code I tried replacing sda3 in the btrfs line with various things like crypt_dev_sda3, dm-0, those give errors saying "Cannot satisfy pre-depends" Also tried btrfs on lvm, no go there either.