Enabling and disabling "Allow Snapshot Access" deleted snapshots but not "snapshot" folder

Hey Sandshark 

Can you check from SSH if the snapshots are there.

btrfs subv list -s /data/

Do you see any entries here for your share? Turning off snapshot access should make the "snapshot" folder inaccessible via SMB/NFS but not delete your snapshots! Can you try and reboot NAS after turning off snapshot access?

A little testing here. I made a test share on my NAS: "Test". I enable snapshot access on this folder and I can see the snapshots folder being visible inside, as expected.

root@Datastore:~# ls -l /data/Test/
total 0
drwxr-xr-x 2 root root 40 Mar 30 17:49 snapshot

The snapshots folder is actually mounted when you enable snapshot access. The snapshots folder is a subvolume in itself.

root@Datastore:~# mount | grep Test
tmpfs on /data/Test/snapshot type tmpfs (rw,noatime,nodiratime,size=4k)

So anyway, I start taking snapshots (from the GUI) and they are visible inside the snapshots folder, as expected. I can also access this over SMB/NFS.

root@Datastore:~# ls -l /data/Test/snapshot/
total 0
drwxrwxrwx+ 1 guest guest 126 Mar 30 17:51 m_snap1

I confirm the snapshot is indeed there, just for clarity.

root@Datastore:~# btrfs subv list -s /data/ | grep Test
ID 1007 gen 908 cgen 908 top level 1006 otime 2019-03-30 17:54:26 path Test/.snapshots/1/snapshot

I turn off snapshot access on my share. My snapshots folder is gone from the share and I can no longer see if over SMB/NFS.

root@Datastore:~# ls -l /data/Test/
total 0

The snapshots folder is not longer mounted either.

root@Datastore:~# mount | grep Test
root@Datastore:~#

The snapshot still exists though.

root@Datastore:~# btrfs subv list -s /data/ | grep Test
ID 1007 gen 908 cgen 908 top level 1006 otime 2019-03-30 17:54:26 path Test/.snapshots/1/snapshot

So, it is not a bug in the firmware itself I would say as I run 6.9.5 too. More likely is that something in your config got skewed somehow. Start by checking if the snapshots are actually there, from the CLI. Also, check if that snapshots folder still mounted? If it is, you can probably just un-mount the snapshots folder (or try to reboot NAS).

Cheers