copy offload for SMB?

David Disseldorp ddiss at
Fri Feb 22 09:42:53 MST 2013

Hi Christopher,

On Fri, 22 Feb 2013 10:22:50 -0600
"Christopher R. Hertel" <crh at> wrote:

> On 02/22/2013 09:08 AM, David Disseldorp wrote:
> :
> > Server support is there, with a few quirks[1]. I'm not aware of anything
> > pre-2k12 that uses it on the client side, but the ioctl itself has been
> > around for donkey's years (SMB1), so there's likely something obscure
> > using it.
> David,
> IOCTL handling in SMB1 is flaky at best.  I believe that the
> NT_TRANSACT_IOCTL call works, but SMB_COM_IOCTL is hamstrung and
> TRANS2_IOCTL2 was never implemented.  Do you have pointers to docs showing
> when this IOCTL was introduced to Windows and/or how it was used?

No, nothing aside from [MS-SMB].pdf.

Cheers, David

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