Comment # 8 on bug 953985 from Stefan Knorr

Proposal for a RN entry below.

Arvin, can you check if my added prose is (technically) ok? The command line
stuff is taken from the TID, so it should be fine.


     Btrfs: Disk Space Leak after System Rollbacks

     openSUSE 13.2 used a Btrfs partition layout that allowed for disk space
     to become permanently occupied with stale, inaccessible contents after the
     first system rollback was executed.
     This layout issue was fixed in openSUSE Leap 42.1, but only for newly
     installed systems.

     If you are upgrading from openSUSE 13.2, you cannot actually convert the
     to the new layout, but you can reclaim the lost disk space.

     1. Mount the initial root filesystem after a rollback:
        mount /dev/<root> -o subvol=@ /mnt
     2. Remove all files below /mnt that are not in a subvolume:
        find /mnt -xdev -delete
     3. Umount the filesystem again:
        umount /mnt