disk_config /dev/sda

primary swap  2GiB   swap sw
primary -     40GiB- -    -
primary /home 40GiB- xfs defaults

disk_config btrfs fstabkey:uuid
btrfs single
btrfs  single  /                        btrfs  defaults
btrfs  single  /boot/grub2/i386-pc      btrfs  subvol=@/boot/grub2/i386-pc
btrfs  single  /boot/grub2/x86_64-efi   btrfs  subvol=@/boot/grub2/x86_64-efi
btrfs  single  /opt                     btrfs  subvol=@/opt
btrfs  single  /srv                     btrfs  subvol=@/srv
btrfs  single  /tmp                     btrfs  subvol=@/tmp
btrfs  single  /usr/local               btrfs  subvol=@/usr/local
btrfs  single  /var/crash               btrfs  subvol=@/var/crash
btrfs  single  /var/lib/libvirt/images  btrfs  subvol=@/var/lib/libvirt/images
btrfs  single  /var/lib/mailman         btrfs  subvol=@/var/lib/mailman
btrfs  single  /var/lib/mariadb         btrfs  subvol=@/var/lib/mariadb
btrfs  single  /var/lib/mysql           btrfs  subvol=@/var/lib/mysql
btrfs  single  /var/lib/named           btrfs  subvol=@/var/lib/named
btrfs  single  /var/lib/pgsql           btrfs  subvol=@/var/lib/pgsql
btrfs  single  /var/log                 btrfs  subvol=@/var/log
btrfs  single  /var/opt                 btrfs  subvol=@/var/opt
btrfs  single  /var/spool               btrfs  subvol=@/var/spool
btrfs  single  /var/tmp                 btrfs  subvol=@/var/tmp
btrfs  single  /.snapshots              btrfs  subvol=@/.snapshots