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

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Date:	Wed, 6 Jun 2007 17:16:21 +0100
From:	Christoph Hellwig <hch@...radead.org>
To:	Jared Hulbert <jaredeh@...il.com>
Cc:	Christoph Hellwig <hch@...radead.org>, carsteno@...ibm.com,
	Nick Piggin <nickpiggin@...oo.com.au>,
	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

On Wed, Jun 06, 2007 at 09:07:16AM -0700, Jared Hulbert wrote:
> I estimate something on the order 5-10 million Linux phones use
> something similar to these patches.  I wonder if there are that many
> provable users of of the simple cramfs.  This is where the community
> has taken cramfs.

This is what a community disjoint to mainline development has hacked
cramfs in their trees into.  Not a good rationale.  This whole
"but we've always done it" attitute is a little annoying, really.

FYI: Cartsten had an xip fs for s390 aswell, and that evolved into
the filemap.c bits after a lot of rework an quite a few round of
review.

> Nevertheless, I understand your point.  I wrote AXFS in part because
> the hacks required to do XIP on cramfs where ugly, hacky, and complex.

I can't find a reference to AXFS anywhere in this thread.

> > Please
> >use something like the existing ext2 xip mode instead of add support
> >to romfs using the generic filemap methods.
> 
> What??  You mean like use xip_file_mmap() and implement
> get_xip_page()?  Did you read my latest patch?

Yes.  This is the highlevel way to go, just please don't hack it into
cramfs.


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