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Old 03-13-2018, 05:22 AM   #1
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Registered: Mar 2014
Location: Germany
Distribution: Mint Debian Ed.
Posts: 14

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Samba timestamps SMB1 vs. SMB3

TL,DR: cp -a keeps mtime to a SMB1 share, loses it to a SMB2/3 share — how to fix?

I'm running Debian Stretch Samba file servers for Windows and Linux clients. I see (smbstatus -b) all our Win10 clients connecting with SMB3_11, our Linux clients (Mint LMDE2 = Debian Jessie) connecting with SMB1.
Now for security reasons I thought it wise to block the old SMB1 protocol. Server-side this is easy: adding a line min protocol = SMB2 to /etc/samba/smb.conf and reloading smbd does it. Unix extensions are active.

Now the Linux clients couldn't connect anymore. I was a bit surprised to learn that mount.cifs still defaults to SMB1. So I added in /etc/fstab the mount option vers=3.0:
//SERVER1/Home /mnt/home cifs vers=3.0,users,noauto,credentials=/home/[…]
Which re-enabled them, now connecting with SMB3_00 — fine, I thought.
I also added the line client min protocol = SMB2 to the client's smb.conf which is probably not necessary.

But then I noticed that files copied to the share mount points via cp -a or via a Wine client did not keep their mtimes; they get now the moment of uploading as their mtimes on the server, effectively killing any backup strategy.
With vers=2.0 or 2.1, same. With SMB1, they keep their mtimes.
Using gnome-commander or caja for copying to the mounts, the mtimes are kept even with SMB3. Huh?

I read ( German, search for Zeitstempel) that copied files count as newly created if unix extensions are not active and owners on client and server are different — which is both not true here.

Now I'm at a loss… how do I keep the mtime on a SMB3 share?

Last edited by HansPL; 03-13-2018 at 06:25 AM.


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