linux-kernel - RFI for 2.6.25.5 : Re: Regression- XFS won't mount on partitioned md array

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Date:	Sat, 24 May 2008 14:33:35 +0100
From:	David Greaves <david@...eaves.com>
To:	Greg KH <greg@...ah.com>
CC:	Eric Sandeen <sandeen@...deen.net>, David Chinner <dgc@....com>,
	xfs@....sgi.com,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@...radead.org>,
	LinuxRaid <linux-raid@...r.kernel.org>
Subject: RFI for 2.6.25.5 : Re: Regression- XFS won't mount on partitioned
 md array

Hi Greg
Perusing:
  http://git.kernel.org/?p=linux/kernel/git/stable/stable-queue.git
doesn't show the patch referenced below as in the queue for 2.6.25.5

David

David Greaves wrote:
> Eric Sandeen wrote:
>> Eric Sandeen wrote:
>>> Eric Sandeen wrote:
>>>
>>>> I'll see if I have a little time today to track down the problem.
>>> Does this patch fix it for you?  Does for me though I can't yet explain
>>> why ;)
>>>
>>> http://www.linux.sgi.com/archives/xfs/2008-05/msg00190.html
>>>
>>> -Eric
> Yes, this fixes it for me - thanks :)
> 
>> So what's happening is that xfs is trying to read a page-sized IO from
>> the last sector of the log... which goes off the end of the device.
>> This looks like another regression introduced by
>> a9759f2de38a3443d5107bddde03b4f3f550060e, but fixed by Christoph's patch
>> in the URL above, which should be headed towards -stable.
> Damn, I guess I misread my bisect readings when things crashed then.
> Still, I said 'around' :)
> 
>> (aside: it seems that this breaks any external log setup where the log
>> consists of the entire device... but I'd have expected the xfsqa suite
>> to catch this...?)
>>
>> The patch avoids the problem by looking for some extra locking but it
>> seems to me that the root cause is that the buffer being read at this
>> point doesn't have it's b_offset, the offset in it's page, set.  Might
>> be another little buglet but harmless it seems.

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