linux-kernel - AW: fix 2.4.33.3 / sun partition size

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Message-ID: <DA6197CAE190A847B662079EF7631C06015692C4@OEKAW2EXVS03.hbi.ad.harman.com>
Date:	Wed, 13 Sep 2006 07:06:25 +0200
From:	"Jurzitza, Dieter" <DJurzitza@...manbecker.com>
To:	"Willy Tarreau" <w@....eu>, <davem@...emloft.net>
Cc:	<linux-kernel@...r.kernel.org>, "Jeff Mahoney" <jeffm@...e.com>,
	<sparclinux@...r.kernel.org>
Subject: AW: fix 2.4.33.3 / sun partition size

Hi Willy,
> It would really depend on the on-disk format. If the 
> partition table really stores 32 bit ints for sector counts, 
> there's no point switching from ints to longs. But if it 
> already stores 64 bits, then we're limiting it to 2 TB with 
> 32 bit ints. I haven't checked the code right now, so I don't 
> know. I hope Davem will enlighten us on this matter.
> 
I see your point. The question is: what happens if we forcibly cast a 8 byte unsigned long into a 4 byte (unsigned ...) int.
One point is only sun related here: the 1/2TByte limit for sun partitions. The other things are generic ones, independent of the architecture but no: at the very moment that a long differs in size from an int we run into problems IMHO. It's unclean, at last.
Do you think it would be better to do an explicit cast in each call to pinpoint the issue?
Thanks for your inputs, and, yes, it's been quiet on sparclinux, it sounds like Dave Miller is (hopefully!) off for holidays - and I think he deserves it, doesn't he :-) ?
Take care



Dieter


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