linux-kernel - RE: [[PATCH v1] 16/37] [CIFS] SMBD: Post a SMBD message with no payload

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Date:   Mon, 14 Aug 2017 22:51:03 +0000
From:   Long Li <longli@...rosoft.com>
To:     Tom Talpey <ttalpey@...rosoft.com>,
        Christoph Hellwig <hch@...radead.org>
CC:     Steve French <sfrench@...ba.org>,
        "linux-cifs@...r.kernel.org" <linux-cifs@...r.kernel.org>,
        "samba-technical@...ts.samba.org" <samba-technical@...ts.samba.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [[PATCH v1] 16/37] [CIFS] SMBD: Post a SMBD message with no
 payload



> -----Original Message-----
> From: Tom Talpey
> Sent: Monday, August 14, 2017 12:00 PM
> To: Long Li <longli@...rosoft.com>; Christoph Hellwig <hch@...radead.org>
> Cc: Steve French <sfrench@...ba.org>; linux-cifs@...r.kernel.org; samba-
> technical@...ts.samba.org; linux-kernel@...r.kernel.org
> Subject: RE: [[PATCH v1] 16/37] [CIFS] SMBD: Post a SMBD message with no
> payload
> 
> > -----Original Message-----
> > From: linux-cifs-owner@...r.kernel.org [mailto:linux-cifs-
> > owner@...r.kernel.org] On Behalf Of Long Li
> > Sent: Monday, August 14, 2017 2:20 PM
> > To: Christoph Hellwig <hch@...radead.org>
> > Cc: Steve French <sfrench@...ba.org>; linux-cifs@...r.kernel.org;
> > samba- technical@...ts.samba.org; linux-kernel@...r.kernel.org
> > Subject: RE: [[PATCH v1] 16/37] [CIFS] SMBD: Post a SMBD message with
> > no payload
> >
> > > > Implement the function to send a SMBD message with no payload.
> > > > This is
> > > required at times when we want to extend credtis to server to have
> > > it continue to send data, without sending any actual data payload.
> > >
> > > Shouldn't this just be implemented as a special case in the version
> > > that posts data?
> >
> > It uses a different packet format "struct smbd_data_transfer_no_data".
> > I can restructure some common code to share between packet sending
> functions.
> 
> The SMB Direct keepalive is just a Data Transfer Message with no payload
> (MS-SMBD section 2.2.3) and the SMB_DIRECT_RESPONSE_REQUESTED flag
> possibly set.  I don't see any need to define a special structure to describe
> this?

Data Transfer Message has the following extra fields at the end of an empty packet.

        __le32 padding;
        char buffer[0];

I agree with you those can be merged to a special structure case. Will make the change.

> 
> Tom.