linux-ext4 - Re: Kernel 3.3.8 breaks accidental ext3 mount of extended partition

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Message-ID: <x49ehp2tee4.fsf@segfault.boston.devel.redhat.com>
Date:	Tue, 26 Jun 2012 09:02:27 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Torsten Hilbrich <torsten.hilbrich@...unet.com>
Cc:	"Richard W.M. Jones" <rjones@...hat.com>,
	linux-ext4@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: Kernel 3.3.8 breaks accidental ext3 mount of extended partition

Torsten Hilbrich <torsten.hilbrich@...unet.com> writes:

> Am 25.06.2012 18:38, schrieb Jeff Moyer:
>> "Richard W.M. Jones" <rjones@...hat.com> writes:
>> 
>>> On Mon, Jun 18, 2012 at 07:59:30AM +0200, Torsten Hilbrich wrote:
>>>> Hello,
>>>>
>>>> a software that tries to mount each existing partition as ext3 file system started to fail when updating from v3.3.7 to v3.3.8.
>>>>
>>>> The applications then hangs-up in the mount syscall, here is a snapshot of its stack at this moment:
>>>
>>> We just ran into what we think is the same problem.
>>>
>>> Note that ext4 fails like this for any 1024 byte sized filesystem (of
>>> zeroes) that you try to mount.  It's really nothing to do with
>>> extended partitions.
>>>
>>> Here is a very simple reproducer + stack trace:
>>>
>>>   https://bugzilla.redhat.com/show_bug.cgi?id=835019#c4
>>>
>>> I will try out the patch suggested later on in this thread.
>> 
>> Please try the attached patch instead.  The patch I had originally
>> posted for this allowed marking the first buffer beyond EOD as
>> uptodate.  This isn't correct.  The patch I've attached below fixes the
>> infinite loop in __getblk_slow.
>
> This patch also fixes the ext3 mount problem on extented partition.

Great news, thanks for testing, guys!  I'll follow up with another patch
posting this morning.

Cheers,
Jeff
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