linux-kernel - Re: XFS Fails Quality Assurance Tests on ARM

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Date:	Tue, 30 Oct 2007 13:14:29 -0500
From:	Eric Sandeen <sandeen@...deen.net>
To:	Christoph Hellwig <hch@...radead.org>
CC:	Andi Kleen <andi@...stfloor.org>,
	David Miller <davem@...emloft.net>, byron.bbradley@...il.com,
	linux-kernel@...r.kernel.org
Subject: Re: XFS Fails Quality Assurance Tests on ARM

Christoph Hellwig wrote:
> On Tue, Oct 30, 2007 at 12:47:35AM -0500, Eric Sandeen wrote:
>> There was a patch floating around to "fix" it but it's not on-disk
>> compatible w/ x86 & friends, it just makes things consistent for arm.  I
>> think packing some of these structures would take care of it, but this
>> problem could use some attention & testing I think, it's been floating
>> around a long time.
> 
> Do you have a pointer to that patch?  Once the unaliged fields are
> identified simply using get_unaligned on them should fix this issue.
> 

http://www.spinics.net/lists/arm-kernel/msg18479.html

is the one I was thinking of, IIRC, but it just does the math a
different way so that it comes out right on ARM, and doesn't fix the
underlying problem.  I think the end result is no crashes, but a
filesystem which is broken when used on another arch.

But the problem AFAIK is that the *on-disk* structures don't match when
compiled with one ARM abi or another, I think, so get_unaligned isn't
going to help here.

-Eric
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