[cifs-protocol] [EXTERNAL] SMB2-WRITE with offset=-2 - TrackingID#2411220040008626

[Michael Bowen]

[DocHelp to bcc]

Hi,

Thanks for your question. We've created case 2411220040008626 to track this issue. One of our engineers will contact you soon.

Best regards,
Michael Bowen
Sr. Escalation Engineer - Microsoft® Corporation
 
-----Original Message-----
From: Ralph Boehme <slow at samba.org> 
Sent: Friday, November 22, 2024 1:57 AM
To: Interoperability Documentation Help <dochelp at microsoft.com>
Cc: cifs-protocol at lists.samba.org
Subject: [EXTERNAL] SMB2-WRITE with offset=-2

Hello dochelp,

according to MS-FSA 2.1.5.4 "Server Requests a Write"

   If ByteOffset equals -2, then set ByteOffset to
   Open.CurrentByteOffset.

a write at this magic offset should happen at the at of the file.

However, if I try this over SMB3 against a Windows server this just fails with STATUS_INVALID_PARAMETER.

Is this not supposed to work over the wire?

Trace attached, cf packets 45+46.

Thanks!
-slow