From: Christoph Hellwig <hch@infradead.org>
To: carsteno@de.ibm.com
Cc: Christoph Hellwig <hch@infradead.org>,
Jared Hulbert <jaredeh@gmail.com>,
Nick Piggin <nickpiggin@yahoo.com.au>,
Andrew Morton <akpm@linux-foundation.org>,
richard.griffiths@windriver.com,
Richard Griffiths <res07ml0@verizon.net>,
Linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2.6.21] cramfs: add cramfs Linear XIP
Date: Thu, 7 Jun 2007 20:38:44 +0100 [thread overview]
Message-ID: <20070607193844.GB17144@infradead.org> (raw)
In-Reply-To: <46683B6A.6030306@de.ibm.com>
On Thu, Jun 07, 2007 at 07:07:54PM +0200, Carsten Otte wrote:
> I've had a few beer long discussion with Joern Engel and David
> Woodhouse on this one. To cut a long discussion short: the current XIP
> infrastructure is not sufficient to be used on top of mtd. We'd need
> some extenstions:
> - on get_xip_page() we'd need to state if we want the reference
> read-only or read+write
> - we need a put_xip_page() to return references
> - and finally we need a callback for the referece, so that the mtd
> driver can ask to get its reference back (in order to unmap from
> userland when erasing a block)
And we'll need that even when using cramfs. There's not way we'd
merge a hack where the user has to specify a physical address on
the mount command line.
> While I fully agree, that a flash filesystem using xip would be very
> desireable, the proposed cramfs extension is a totaly different beast
> that has its own value to me: the ability to select per file whether
> xip or compression is more efficient.
You'd of course want all that for a full flash filesystem aswell.
next prev parent reply other threads:[~2007-06-07 19:39 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-22 22:09 [PATCH 2.6.21] cramfs: add cramfs Linear XIP Richard Griffiths
2007-05-22 22:49 ` Andrew Morton
2007-05-22 22:58 ` Richard Griffiths (wrs)
2007-05-23 7:51 ` Carsten Otte
2007-05-23 15:25 ` Richard Griffiths (wrs)
2007-05-24 6:46 ` Carsten Otte
2007-05-23 17:21 ` Jared Hulbert
2007-05-24 6:57 ` Carsten Otte
2007-05-29 5:10 ` Nick Piggin
2007-06-02 0:48 ` Jared Hulbert
2007-06-02 8:42 ` Nick Piggin
2007-06-04 13:32 ` Carsten Otte
2007-06-06 11:13 ` Jared Hulbert
2007-06-06 11:33 ` Christoph Hellwig
2007-06-06 15:17 ` Richard Griffiths
2007-06-06 15:50 ` Christoph Hellwig
2007-06-06 16:09 ` Jared Hulbert
2007-06-06 16:07 ` Jared Hulbert
2007-06-06 16:16 ` Christoph Hellwig
2007-06-06 18:26 ` Jared Hulbert
2007-06-07 19:37 ` Christoph Hellwig
2007-06-07 19:40 ` Christoph Hellwig
2007-06-07 20:27 ` Jared Hulbert
2007-06-08 7:39 ` Carsten Otte
2007-06-07 21:11 ` Jared Hulbert
2007-06-07 21:15 ` Christoph Hellwig
2007-06-07 22:59 ` Jared Hulbert
2007-06-08 13:19 ` Jörn Engel
2007-06-08 13:10 ` Jörn Engel
2007-06-06 16:15 ` Carsten Otte
2007-06-06 16:23 ` Christoph Hellwig
2007-06-06 18:40 ` Jared Hulbert
2007-06-06 22:59 ` Matt Mackall
2007-06-07 17:07 ` Carsten Otte
2007-06-07 19:38 ` Christoph Hellwig [this message]
2007-06-07 20:34 ` Jared Hulbert
2007-06-08 7:28 ` Christoph Hellwig
2007-06-08 16:02 ` Jared Hulbert
2007-06-08 7:17 ` Carsten Otte
2007-06-08 7:26 ` Christoph Hellwig
2007-06-08 7:50 ` Carsten Otte
2007-06-08 7:57 ` Christoph Hellwig
2007-06-08 7:59 ` Carsten Otte
2007-06-08 8:04 ` Christoph Hellwig
2007-06-08 16:05 ` Jared Hulbert
2007-06-08 16:09 ` Christoph Hellwig
2007-06-08 16:11 ` Jared Hulbert
2007-06-08 16:15 ` Christoph Hellwig
2007-06-08 17:51 ` Jörn Engel
2007-06-08 19:04 ` Carsten Otte
2007-06-08 19:06 ` Carsten Otte
2007-06-08 19:36 ` Jörn Engel
2007-06-09 7:55 ` Carsten Otte
2007-06-09 10:37 ` Jörn Engel
2007-06-08 23:02 ` Jared Hulbert
2007-06-07 21:19 ` Jared Hulbert
2007-06-06 12:05 ` Carsten Otte
2007-06-06 19:01 ` Jared Hulbert
2007-06-07 1:00 ` Justin Treon
2007-06-13 0:11 ` Jared Hulbert
2007-06-14 13:57 ` Carsten Otte
2007-06-14 16:53 ` Jared Hulbert
2007-06-15 9:22 ` Carsten Otte
2007-06-15 11:49 ` Heiko Carstens
2007-06-15 17:30 ` Jared Hulbert
2007-06-18 7:38 ` Carsten Otte
2007-06-15 13:53 ` Carsten Otte
2007-06-15 21:46 ` Jared Hulbert
2007-05-23 8:21 ` Alistair John Strachan
2007-05-24 20:22 ` Jared Hulbert
2007-05-24 20:52 ` Richard Griffiths
2007-05-24 21:21 ` Jared Hulbert
[not found] <337240.79058.qm@web59309.mail.re1.yahoo.com>
2007-06-09 8:09 ` Carsten Otte
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