Paket: btrfs-progs

ext? nach btrfs konvertieren:
  man btrfs-convert

Dateisystem anlegen und mounten:
  mkfs.btrfs /dev/sda2
  btrfs filesystem show
  mkdir /mnt/btrfs
  mount /dev/sda2 /mnt/btrfs
  cd /mnt/btrfs

Beispieldaten hinein kopieren:
  time cp -a /usr/share/ .

Daten komprimieren:
  btrfs filesystem df -h share/
-> ''Data, single: total=2.01GiB, used=1.53GiB''
  btrfs filesystem defragment -czstd -r share/
  btrfs filesystem df -h share/
-> ''Data, single: total=3.01GiB, used=740.17MiB''
  
Informationen über das top-level Subvolume anzeigen:
  btrfs subvolume show .
-> Subvolume ID: 5

  btrfs subvolume list .
-> noch keine Subvolumes

Subvolume anlegen und Daten hinein verschieben:
  btrfs subvolume create subvol1
  btrfs subvolume list .
  btrfs subvolume show subvol1
-> Subvolume ID: 256
-> Parent ID: 5
  time mv ./share/ ./subvol1/
  
Subvolume umbenennen:
  mv subvol1/ subvol2

Subvolume (erneut) mounten:
  mkdir /mnt/subvol2
  mount -o subvol=/subvol2 /dev/sda2 /mnt/subvol2  

Snapshot erstellen:
  time btrfs subvolume snapshot subvol2 snap1
  btrfs subvolume list .
  btrfs subvolume show snap1
-> Subvolume ID: 257
-> Parent ID: 5

Read-only Snapshot erstellen:
  btrfs subvolume snapshot -r subvol2 snap_ro1

  btrfs filesystem df -h .
  btrfs filesystem du -s --human-readable .
  du -sh .
  du -shx .
  btrfs filesystem du -s --human-readable subvol2
  du -sh subvol2
  btrfs filesystem du -s --human-readable snap1

++++ SuSE default root layout |
SuSE default:

  mkfs.btrfs ${BOOT_DEVICE}2
  uuid=$(lsblk -n -o uuid ${BOOT_DEVICE}2)

  mkdir $target
  mount UUID="$uuid" $target || exit

  btrfs subvolume create ${target%/}/@
  btrfs subvolume create ${target%/}/@/.snapshots
  mkdir -p               ${target%/}/@/.snapshots/1
  btrfs subvolume create ${target%/}/@/.snapshots/1/snapshot
  mkdir -p               ${target%/}/@/boot/grub2
  btrfs subvolume create ${target%/}/@/boot/grub2/i386-pc
  btrfs subvolume create ${target%/}/@/boot/grub2/x86_64-efi
  btrfs subvolume create ${target%/}/@/opt
  btrfs subvolume create ${target%/}/@/srv
  btrfs subvolume create ${target%/}/@/tmp
  mkdir -p               ${target%/}/@/usr
  btrfs subvolume create ${target%/}/@/usr/local
  mkdir -p               ${target%/}/@/var
  btrfs subvolume create ${target%/}/@/var/crash
  mkdir -p               ${target%/}/@/var/lib/libvirt
  btrfs subvolume create ${target%/}/@/var/lib/libvirt/images
  btrfs subvolume create ${target%/}/@/var/lib/mailman
  btrfs subvolume create ${target%/}/@/var/lib/mariadb
  btrfs subvolume create ${target%/}/@/var/lib/mysql
  btrfs subvolume create ${target%/}/@/var/lib/named
  btrfs subvolume create ${target%/}/@/var/lib/pgsql
  btrfs subvolume create ${target%/}/@/var/log
  btrfs subvolume create ${target%/}/@/var/opt
  btrfs subvolume create ${target%/}/@/var/spool
  btrfs subvolume create ${target%/}/@/var/tmp

  subvolid=$(btrfs subvolume show $target/@/.snapshots/1/snapshot | sed -rn 's/.*Object ID:\s+//p')
  btrfs subvolume set-default "$subvolid" "$target"
++++