https://bugs.kde.org/show_bug.cgi?id=402154
--- Comment #21 from tagwer...@innerjoin.org ---
As a workround in openSuse, my test install had a /etc/fstab:
UUID=19af1d21-f5c2-4518-a839-a3f2afdb199c / btrfs
defaults 0 0
UUID=19af1d21-f5c2-4518-a839-a3f2afdb199c /var btrfs
subvol=/@/var 0 0
UUID=19af1d21-f5c2-4518-a839-a3f2afdb199c /usr/local btrfs
subvol=/@/usr/local 0 0
UUID=19af1d21-f5c2-4518-a839-a3f2afdb199c /srv btrfs
subvol=/@/srv 0 0
UUID=19af1d21-f5c2-4518-a839-a3f2afdb199c /root btrfs
subvol=/@/root 0 0
UUID=19af1d21-f5c2-4518-a839-a3f2afdb199c /opt btrfs
subvol=/@/opt 0 0
UUID=19af1d21-f5c2-4518-a839-a3f2afdb199c /home btrfs
subvol=/@/home 0 0
UUID=19af1d21-f5c2-4518-a839-a3f2afdb199c /boot/grub2/x86_64-efi btrfs
subvol=/@/boot/grub2/x86_64-efi 0 0
UUID=19af1d21-f5c2-4518-a839-a3f2afdb199c /boot/grub2/i386-pc btrfs
subvol=/@/boot/grub2/i386-pc 0 0
UUID=19af1d21-f5c2-4518-a839-a3f2afdb199c /.snapshots btrfs
subvol=/@/.snapshots 0 0
UUID=a500b70e-4811-4db2-ab79-34e99b142b57 swap swap
It seems that the BTRFS mounts are performed in parallel and there seems to be
no option to specify that specific mounts appear with fixed device numbers.
It is however possible to add "x-systemd.requires" options in the /etc/fstab
that suggest "an order" that mounts are done in - and the device numbers seem
to be allocated in the order of the mounts.
This can only be described as a hack and quite likely fragile.
If "/home" is set to depend on "/" and /.snapshots" and the other BTRFS subvols
set to depend on "/home" then mount order is better defined and the device
number allocated for /home *seems* stable.
With the "x-systemd.required"s added, my /etc/fstab looks like:
UUID=19af1d21-f5c2-4518-a839-a3f2afdb199c / btrfs
defaults 0 0
UUID=19af1d21-f5c2-4518-a839-a3f2afdb199c /var btrfs
subvol=/@/var,x-systemd.requires=/home 0 0
UUID=19af1d21-f5c2-4518-a839-a3f2afdb199c /usr/local btrfs
subvol=/@/usr/local,x-systemd.requires=/home 0 0
UUID=19af1d21-f5c2-4518-a839-a3f2afdb199c /srv btrfs
subvol=/@/srv,x-systemd.requires=/home 0 0
UUID=19af1d21-f5c2-4518-a839-a3f2afdb199c /root btrfs
subvol=/@/root,x-systemd.requires=/home 0 0
UUID=19af1d21-f5c2-4518-a839-a3f2afdb199c /opt btrfs
subvol=/@/opt,x-systemd.requires=/home 0 0
UUID=19af1d21-f5c2-4518-a839-a3f2afdb199c /home btrfs
subvol=/@/home,x-systemd.requires=/,x-systemd.requires=/.snapshots 0 0
UUID=19af1d21-f5c2-4518-a839-a3f2afdb199c /boot/grub2/x86_64-efi btrfs
subvol=/@/boot/grub2/x86_64-efi,x-systemd.requires=/home 0 0
UUID=19af1d21-f5c2-4518-a839-a3f2afdb199c /boot/grub2/i386-pc btrfs
subvol=/@/boot/grub2/i386-pc,x-systemd.requires=/home 0 0
UUID=19af1d21-f5c2-4518-a839-a3f2afdb199c /.snapshots btrfs
subvol=/@/.snapshots 0 0
UUID=a500b70e-4811-4db2-ab79-34e99b142b57 swap swap
defaults 0 0
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