以前装 ubuntukulin，不好用改装 opensuse 42.1，装系统时老提示 / 被其它系统阴影化，可能出问题。装系统时把 / 格掉仍然提示。不管那么多了，还是装上再说。
以下是装上 opensuse 42.1 后的 /etc/fstab
UUID=b3e7a46d-1d89-44a8-a8be-e231b900e293 swap swap defaults 0 0
UUID=8f273d8f-ea12-413d-8ff9-addc0d428b94 / btrfs defaults 0 0
UUID=8f273d8f-ea12-413d-8ff9-addc0d428b94 /boot/grub2/i386-pc btrfs subvol=@/boot/grub2/i386-pc 0 0
UUID=8f273d8f-ea12-413d-8ff9-addc0d428b94 /boot/grub2/x86_64-efi btrfs subvol=@/boot/grub2/x86_64-efi 0 0
UUID=cf34ce55-f15f-4c95-82b2-75ce8c6dbe12 /home btrfs defaults 0 0
UUID=8f273d8f-ea12-413d-8ff9-addc0d428b94 /opt btrfs subvol=@/opt 0 0
UUID=8f273d8f-ea12-413d-8ff9-addc0d428b94 /srv btrfs subvol=@/srv 0 0
UUID=8f273d8f-ea12-413d-8ff9-addc0d428b94 /tmp btrfs subvol=@/tmp 0 0
UUID=8f273d8f-ea12-413d-8ff9-addc0d428b94 /usr/local btrfs subvol=@/usr/local 0 0
UUID=8f273d8f-ea12-413d-8ff9-addc0d428b94 /var/crash btrfs subvol=@/var/crash 0 0
UUID=8f273d8f-ea12-413d-8ff9-addc0d428b94 /var/lib/libvirt/images btrfs subvol=@/var/lib/libvirt/images 0 0
UUID=8f273d8f-ea12-413d-8ff9-addc0d428b94 /var/lib/mailman btrfs subvol=@/var/lib/mailman 0 0
UUID=8f273d8f-ea12-413d-8ff9-addc0d428b94 /var/lib/mariadb btrfs subvol=@/var/lib/mariadb 0 0
UUID=8f273d8f-ea12-413d-8ff9-addc0d428b94 /var/lib/mysql btrfs subvol=@/var/lib/mysql 0 0
UUID=8f273d8f-ea12-413d-8ff9-addc0d428b94 /var/lib/named btrfs subvol=@/var/lib/named 0 0
UUID=8f273d8f-ea12-413d-8ff9-addc0d428b94 /var/lib/pgsql btrfs subvol=@/var/lib/pgsql 0 0
UUID=8f273d8f-ea12-413d-8ff9-addc0d428b94 /var/log btrfs subvol=@/var/log 0 0
UUID=8f273d8f-ea12-413d-8ff9-addc0d428b94 /var/opt btrfs subvol=@/var/opt 0 0
UUID=8f273d8f-ea12-413d-8ff9-addc0d428b94 /var/spool btrfs subvol=@/var/spool 0 0
UUID=8f273d8f-ea12-413d-8ff9-addc0d428b94 /var/tmp btrfs subvol=@/var/tmp 0 0
UUID=8f273d8f-ea12-413d-8ff9-addc0d428b94 /.snapshots btrfs subvol=@/.snapshots 0 0
UUID=6E96-EFC4 /boot/efi vfat umask=0002,utf8=true 0 0
多了这么多的@子目录。我试了一下，改成这样也可系统正常。
UUID=b3e7a46d-1d89-44a8-a8be-e231b900e293 swap swap defaults 0 0
UUID=8f273d8f-ea12-413d-8ff9-addc0d428b94 / btrfs defaults 0 1
UUID=cf34ce55-f15f-4c95-82b2-75ce8c6dbe12 /home btrfs defaults 0 0
UUID=6E96-EFC4 /boot vfat umask=0002,utf8=true 0 0
UUID=8f273d8f-ea12-413d-8ff9-addc0d428b94 /.snapshots btrfs subvol=@/.snapshots 0 0
只是最后一行 UUID=8f273d8f-ea12-413d-8ff9-addc0d428b94 /.snapshots btrfs subvol=@/.snapshots 0 0 不能删除，要不然 snapper 用不成，