Comment # 7 on bug 1224808 from Antonio Feijoo

Observed:

> [    1.415049] localhost kernel: BTRFS: device label ROOT devid 1 transid 65 /dev/vda3 (254:3) scanned by mount (450)
> [    1.415283] localhost kernel: BTRFS info (device vda3): first mount of filesystem 0ccd61f9-7e1a-4329-9b48-04673b6ba623
> [    1.415292] localhost kernel: BTRFS info (device vda3): using crc32c (crc32c-intel) checksum algorithm
> [    1.415295] localhost kernel: BTRFS info (device vda3): using free-space-tree
> [    1.757878] localhost systemd[1]: Switching root.
> [    2.935997] localhost kernel: BTRFS info (device vda3 state M): use zstd compression, level 1
> ...
> [    3.179772] localhost systemd[1]: Mounting /.snapshots...
> [    3.180726] localhost kernel: BTRFS info (device vda3 state M): use  compression, level 0