Large Write_Andx messages

Christopher R. Hertel crh at
Mon Oct 29 18:25:07 GMT 2007

James Peach wrote:
> On 29/10/2007, at 10:29 AM, Jeremy Allison wrote:
>> On Sun, Oct 28, 2007 at 01:25:34PM +0100, Mikael Klamra wrote:
>>> I have tried to sniff similar messages between Windows XP and Windows
>>> Server 2003 R2, but Windows does not seem to put several blocks in
>>> WRITE_ANDX messages. Does Samba use WRITE_ANDX messages with several
>>> blocks? If yes, how are the messages structured?
>> I've not seen Windows clients do this. To test if Windows
>> servers support it, add code to Samba4 smbtorture and
>> try and get it to work against Windows. It should work
>> against Samba, but it's probably not well tested as no
>> Windows clients do this for writes.
> The Mac OS X 10.5 client will do large reads and writes to Samba. The
> Samba support for this works perfectly well.

Nifty! ...but what about from Mac OS X to Windows?  Do you know if Windows
supports large read/write, or is this part of the Unix Extensions negotiations?

I'd be interested in knowing if/how this works against Windows, and I
imagine Mikael would be interested as well.


Chris -)-----

"Implementing CIFS - the Common Internet FileSystem"    ISBN: 013047116X
Samba Team --    -)-----     Christopher R. Hertel
jCIFS Team --  -)-----  ubiqx development, uninq
ubiqx Team --    -)-----          crh at
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