linux-kernel - Re: [PATCH 2.6.21] cramfs: add cramfs Linear XIP

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Date:	Thu, 24 May 2007 08:57:08 +0200
From:	Carsten Otte <cotte@...ibm.com>
To:	Jared Hulbert <jaredeh@...il.com>
CC:	carsteno@...ibm.com, Andrew Morton <akpm@...ux-foundation.org>,
	richard.griffiths@...driver.com,
	Richard Griffiths <res07ml0@...izon.net>,
	Linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.21] cramfs: add cramfs Linear XIP

Jared Hulbert wrote:
>> To me, it looks like this
>> work can be modified to use filemap_xip.
> 
> How?
First, get a struct page behind the subject file system image. A good 
idea to get there is to use vmem_map, which allows have a 
discontiguous mem_map array in virtual storage. Then add the memory 
segment's address range to it. Sparsemem also helps, if vmem_map is 
not available.

Second, implement get_xip_page for this file system. This address 
space operation needs to be provided for all files that are supposed 
to be XIP. readpage(s)/writepage(s) should not be provided for these 
files, becuase they rely on using the page cache.

Third, use file operations from mm/filemap_xip.c.

so long,
Carsten
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