[Samba] vfs_shadow_copy2 cannot read/find snapshots

[Sebastian Neustein]

Am 23.05.2023 um 10:27 schrieb Anoop C S:
> On Mon, 2023-05-22 at 15:32 +0200, Sebastian Neustein via samba wrote:
>> log still says:
>> [2023/05/22 15:23:23.324179,  1]
>> ../../source3/modules/vfs_shadow_copy2.c:2222(shadow_copy2_get_shadow
>> _copy_data)
>>     shadow_copy2_get_shadow_copy_data: SMB_VFS_NEXT_OPEN failed for
>> '/srv/glvol_samba/admin/projects/.snaps' - Permission denied
>>
>> I had it working before and had some trouble with these two
>> parameters aswell.
>
> Since you mentioned that it was working before, what changed now? Is
> that an update to GlusterFS or Samba that is causing the issue? Or
> something else?

The only thing I am aware of is that I changed
- mounting the device from /etc/fstab to 
/etc/systemd/system/srv-glvol_samba.mount, which looks like this:
- debian version changed from 11.6 to 11.7.
- smb.conf to resolve this

the mount unit looks like this

[Unit]
Description=Data Dir
After=network.target
Requires=network-online.target

[Mount]
What=B741:/glvol_samba
Where=/srv/glvol_samba
Type=glusterfs
Options=defaults,_netdev,negative-timeout=10,attribute-timeout=30,fopen-keep-cache,direct-io-mode=enable,acl

[Install]
WantedBy=multi-user.target



while the /etc/fstab entry was:
B741:/glvol_samba /srv/glvol_samba glusterfs _netdev,defaults,acl 0 0


I tried mounting the volume with the /etc/fstab entry again, but that 
did not make a change. Same error message when trying to access the 
previous file versions from a windows client.




> Can you check for any other errors in
> /var/log/glusterfs/snaps/glvol_samba/snapd.log or in GlusterFS FUSE
> mount log under /var/log/glusterfs/?

These are all log entries when I unmount and mount the volume:

root at B741:/var/log/glusterfs# cat glusterd.log
The message "I [MSGID: 106496] 
[glusterd-handshake.c:954:__server_getspec] 0-management: Received mount 
request for volume shd/glvol_samba" repeated 19 times between 
[2023-05-22 22:00:21.718887 +0000] and [2023-05-22 22:00:21.980543 +0000]
[2023-05-23 09:14:20.346930 +0000] I [MSGID: 106496] 
[glusterd-handshake.c:954:__server_getspec] 0-management: Received mount 
request for volume /glvol_samba

root at B741:/var/log/glusterfs# tail snaps/glvol_samba/snapd.log
[2023-05-23 09:13:55.540643 +0000] W [socket.c:749:__socket_rwv] 
0-tcp.glvol_samba-server: readv on 192.168.40.13:49122 failed (Keine 
Daten verfügbar)
[2023-05-23 09:13:55.540716 +0000] I [MSGID: 115036] 
[server.c:500:server_rpc_notify] 0-glvol_samba-server: disconnecting 
connection 
[{client-uid=CTX_ID:3256ac0d-77b9-47cb-bcc3-7bfbc4d3cfe1-GRAPH_ID:0-PID:468941-HOST:A320-PC_NAME:glvol_samba-snapd-client-RECON_NO:-0}]
[2023-05-23 09:13:55.540949 +0000] I [MSGID: 101055] 
[client_t.c:396:gf_client_unref] 0-glvol_samba-server: Shutting down 
connection 
CTX_ID:3256ac0d-77b9-47cb-bcc3-7bfbc4d3cfe1-GRAPH_ID:0-PID:468941-HOST:A320-PC_NAME:glvol_samba-snapd-client-RECON_NO:-0
[2023-05-23 09:14:20.367096 +0000] I [addr.c:52:compare_addr_and_update] 
0-snapd-glvol_samba: allowed = "*", received addr = "192.168.40.13"
[2023-05-23 09:14:20.367145 +0000] I [MSGID: 115029] 
[server-handshake.c:565:server_setvolume] 0-glvol_samba-server: accepted 
client from 
CTX_ID:39951d0a-d67c-4984-b278-a21b9579f471-GRAPH_ID:0-PID:635482-HOST:A320-PC_NAME:glvol_samba-snapd-client-RECON_NO:-0 
(version: 10.4) with subvol snapd-glvol_samba
[2023-05-23 09:14:20.367446 +0000] E 
[server-handshake.c:156:server_first_lookup] 0-snapd-glvol_samba: lookup 
on root failed: Das Argument ist ungültig


-- 
Sebastian Neustein

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