[Samba] VFS shadowcopy2 with FeeBSD & ZFS

[Remy Zandwijk]

We have:

vfs objects  = shadow_copy2 zfsacl

(Actually, vfs objects = shadow_copy2 zfsacl fruit streams_xattr, but I wanted to point out the order of shadow_copy2 and zfsacl).


To rule out shadow:format problems, I would create just one snapshot with a simple name and configure shadow:format accordingly.

Also, is /public the mountpoint of the ZFS dataset? If not, then you might need 'shadow:snapdirseverywhere = yes'. If you have nested ZFS datasets, you'll also need that setting.

-Remy



> On 5 Oct 2020, at 09:00, O'Connor, Daniel via samba <samba at lists.samba.org> wrote:
> 
> Hi,
> I have a FreeBSD 12.1 system with Samba 4.11.8 using ZFS and I want to get shadow copies working, however the clients (Windows 10) don't show anything in the 'previous versions' tab. I think it's doing something as it say 'working' for a short amount of time. Also if I crank up vfs debugging to 10 I get:
> [2020/10/05 16:50:03.879093, 10, pid=50572, effective(0, 0), real(0, 0), class=vfs] ../../source3/smbd/vfs.c:65(vfs_find_backend_entry)
>  vfs_find_backend_entry called for shadow_copy2
>  Successfully loaded vfs module [shadow_copy2] with the new modules system
> ...
> [2020/10/05 16:50:12.483055, 10, pid=50572, effective(3000037, 20), real(0, 0), class=vfs] ../../source3/modules/vfs_default.c:1327(vfswrap_fsctl)
>  FSCTL_GET_SHADOW_COPY_DATA: 0 volumes for path[Program Files].
> 
> The share configuration is done like so:
> 
> [public]
>        comment = Public
>        path = /public
>        read only = no
>        public = yes
>        vfs objects = zfsacl shadow_copy2
>        shadow:snapdir = .zfs/snapshot
>        shadow:format = zrepl_%Y%m%d_%H%M%S_000
>        shadow:localtime = no
>        shadow:sort = desc
>        acl allow execute always = yes
>        map acl inherit = yes
>        store dos attributes = yes
> 
> ie it is mounted at /public, and snapshots are under /public/.zfs/snapshot and called things like 'zrepl_20201005_063741_000' and are in UTC.
> 
> Is there a way I can get some more debugging out of the shadow_copy2 module (or can someone point out my mistake :) ?
> 
> Thanks.
> 
> --
> Daniel O'Connor
> "The nice thing about standards is that there
> are so many of them to choose from."
> -- Andrew Tanenbaum
> 
> 
> 
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