[Samba] vfs_shadow_copy2 cannot read/find snapshots

[Anoop C S]

On Tue, 2023-05-23 at 11:52 +0200, Sebastian Neustein via samba wrote:
> 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_sh
> > > adow
> > > _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

Ok.

Initially I thought whether we missed any fixes on both sides(Samba
4.17.8 and GlusterFS 10.4). I looked at the patches and it looks like
everything needed are part of installed versions. I even tried to
reproduce(without acl_xattr) without any luck. This might have to do
with how FUSE mount is setup on the server.

Can you also please check whether you can list the contents of various
snapshots present under /srv/glvol_samba/admin/projects/.snaps from
server?

> > 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

In addition to that there will be a log file corresponding to the FUSE
mount of GlusterFS volume under /var/log/glusterfs with mount point as
log file name? Please check if there are any warning/error entries
while trying to list previous versions from windows.


Regards,
Anoop C S.