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

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Message-ID: <20070608131905.GB20718@lazybastard.org>
Date:	Fri, 8 Jun 2007 15:19:05 +0200
From:	Jörn Engel <joern@...ybastard.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 Thu, 7 June 2007 15:59:00 -0700, Jared Hulbert wrote:
> 
> Gee I think it seems logfs would be a better choice.  Jffs2 and
> ubifs(jffs3) for that matter combine node and node header in series
> which means your data nodes aren't aligned to page boundarys. Logfs
> nodes could be more easily aligned.

That used to be the case before I did a format change.  Compression
pretty much requires a format very similar to JFFS2.  The alternative
would be _huge_ complexity.

However, it would be possible to create specialized XIP segments with
the old page-aligned format.  Supporting two kinds of segment format is
still simpler than supporting compression with the old format.

Jörn

-- 
With a PC, I always felt limited by the software available. On Unix,
I am limited only by my knowledge.
-- Peter J. Schoenster
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