SMB1 Locked file for roaming clients

Volker Lendecke Volker.Lendecke at SerNet.DE
Thu Jun 18 04:42:20 MDT 2015

On Thu, Jun 18, 2015 at 01:01:38PM +0300, Uri Simchoni wrote:
> Hi,
> I have an issue with samba 3.3.16-based smb servers and roaming
> clients. When clients roam to a different IP address (e.g. moving the
> laptop to a different floor), suddenly their excel/word files cannot
> be saved because "someone else is editing them".
> With SMB2 the problem is not reproduced - looks like durable file
> handles fix this. With latest samba, the problem is reproduced if the
> connection is limited to SMBv1.
> The way I figure it:
> - Office opens the document file for r/w with share read.
> - Client disappears - does not properly close the file.
> - Client opens a new session, again trying r/w
> - smbd has no way of knowing that this is the same application
> instance that's re-opening the file, especially if it comes from a
> different IP address. It therefore considers this as a sharing
> violation.
> Would it be correct to say that this is an SMB1 limitation, and is
> there any known workaround for this using smb1?

We have "reset on zero vc = yes" for this. Not sure when
this went in tough.


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