netdev - Re: Network/block layer race.

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Message-Id: <20080328.140736.92315090.davem@davemloft.net>
Date:	Fri, 28 Mar 2008 14:07:36 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	johnpol@....mipt.ru
Cc:	axboe@...nel.dk, netdev@...r.kernel.org
Subject: Re: Network/block layer race.

From: Evgeniy Polyakov <johnpol@....mipt.ru>
Date: Fri, 28 Mar 2008 23:56:13 +0300

> Hi.
> 
> On Fri, Mar 28, 2008 at 01:40:53PM -0700, David Miller (davem@...emloft.net) wrote:
> > If content protection is desired, higher level things are needed.
> > For example, SAMBA only uses sendfile() if the remote client
> > has an OP lock on the file in question.
> 
> What I propose is to inform sender about when page is transmitted and
> received on the other side via implicit acks, which are provided already
> by tcp, but is not provided to higher layer.
> We can use it for sendfile and thus do not require higher
> layer 'distributed' locks, i.e. sync some state between hosts to inform
> that data was succesfully received. Patch would be minimal, just export
> sock_wfree() and setup different skb destructor if sk_sock_data is
> provided, that will allow for special users (like the same samba) to use
> ->sendpage() path too (with some changes in the code of course, but that
> is worth whole page copying).

I'd have to see the patch, feel free to submit it :-)
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