Btrfs @snapshots subvolume

Support
1

Just curious how to create a @snapshots subvolume and mount it to /.snapshots?

I tried:
#sudo btrfs sub create /.snapshots
it created .snapshots subvolume and correspondent folder /.snapshots

#sudo btrfs sub create @snapshots
it created @home/john/@snapshots subvolume and correspondent folder /home/john/@snapshots

Thanks.

2

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Some questions arising:

  • Do you have already any snapshots at /.snapshots ?
  • Do you use snapper ?
  • Is snapper configured for config root ?
  • Do you have entrys in /etc/fstab for /.snapshots

what you should see:

sudo btrfs subvolume list /
ID 258 gen 597866 top level 5 path @home
ID 287 gen 594120 top level 258 path @home/.snapshots
ID 3648 gen 597866 top level 5 path @snapshots
ID 4455 gen 597866 top level 5 path @nosnap
ID 5719 gen 597866 top level 5 path @home.snapshots
ID 36033 gen 597866 top level 5 path @

And for every snapshot (created by snapper) you would see something like:

ID 46595 gen 595631 top level 3648 path @snapshots/24850/snapshot
...

And in /.snapshots:

ls -lA /.snapshots
insgesamt 4
drwxr-xr-x 1 root root 32  8. Aug 00:01 24850
...

And in fstab:

cat /etc/fstab|grep -E btrfs
PARTUUID=3ee11111-19qf-4102-945d-90d957d3c111	/			btrfs	rw,noatime,compress=zstd:9,commit=300,subvol=@			0 0
PARTUUID=3ee11111-19qf-4102-945d-90d957d3c111	/.snapshots		btrfs	rw,noatime,compress=zstd:9,commit=300,subvol=@snapshots		0 0
...

You can find good Information about Btrfs in the wiki