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From: David Miller <davem@davemloft.net>
Subject: Re: [RFC][PATCH 1/1] cxgb3i: cxgb3 iSCSI initiator
Date: Thu, 14 Aug 2008 15:23:00 -0700 (PDT)
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From: Andrew Gallatin <gallatin@myri.com>
Date: Thu, 14 Aug 2008 16:45:57 -0400

> Speaking of stateless data placement.  Assume you have a page or set
> of pages allocated by a network driver which contain exactly the data
> a block driver is interested in to fulfill a read request (eg, the NIC
> understands the protocol just well enough to split headers).  Is it
> possible in the block driver to simply replace the pages that are
> attached to the buf with pages allocated by the network driver?
> 
> It was my impression that the pages associated with a buf are in
> fairly magical states and that you cannot replace them.

This, if true, would be quite easy to rectify.