linux-kernel - Re: [PATCH 00/10] AXFS: Advanced XIP filesystem

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Message-ID: <20080902171500.GC19618@logfs.org>
Date:	Tue, 2 Sep 2008 19:15:01 +0200
From:	Jörn Engel <joern@...fs.org>
To:	Jared Hulbert <jaredeh@...il.com>
Cc:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>,
	Linux-kernel@...r.kernel.org, linux-embedded@...r.kernel.org,
	linux-mtd <linux-mtd@...ts.infradead.org>, tim.bird@...sony.com,
	cotte@...ibm.com, nickpiggin@...oo.com.au
Subject: Re: [PATCH 00/10] AXFS: Advanced XIP filesystem

On Tue, 2 September 2008 09:44:19 -0700, Jared Hulbert wrote:
> 
> How is one expected to read those last 4 bytes of a loopbacked file?
> Are they unreadable?  We can add the padding.   I am just wondering if
> this is a bug or a known limitation in the loopback handling or if
> there is a different safer way of reading block devs with truncated
> last blocks.

Can't you just include the final magic into the last block, thereby
making the size a clean multiple of 4k?  It looks as if you have some
padding before the magic anyway.  So you just have to make sure the
padding is at least 4 bytes and write the magic to the end of it.  Apart
from solving this bug, it should also save you some space. ;)


Jörn

-- 
Invincibility is in oneself, vulnerability is in the opponent.
-- Sun Tzu
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