linux-kernel - Re: Problems with hfsplus on ipods in 2.6.38+

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Date:	Thu, 14 Jul 2011 21:26:11 -0400 (EDT)
From:	Daniel Barkalow <barkalow@...ervon.org>
To:	Seth Forshee <seth.forshee@...onical.com>
cc:	Christoph Hellwig <hch@...era.com>, linux-kernel@...r.kernel.org
Subject: Re: Problems with hfsplus on ipods in 2.6.38+

On Thu, 14 Jul 2011, Daniel Barkalow wrote:

> On Thu, 14 Jul 2011, Seth Forshee wrote:
> 
> > On Wed, Jul 13, 2011 at 10:10:13PM -0400, Daniel Barkalow wrote:
> > > I've got an ipod which doesn't work with 2.6.38 or later, unless I revert:
> > > 
> > > 358f26d52680cb150907302d4334359de7dd2d59
> > > 52399b171dfaea02b6944cd6feba49b624147126
> > > 
> > > In the failing case, I get:
> > > 
> > >  sd 2:0:0:0: [sdb] Bad block number requested
> > >  hfs: unable to find HFS+ superblock
> > > 
> > > in dmesg when I try to mount it.
> > > 
> > > Before 2.6.38, or with those commits reverted, it mounts fine and works so 
> > > far as I can tell. (There's an Ubuntu bug report: 
> > > https://bugs.launchpad.net/ubuntu/+source/util-linux/+bug/734883, which 
> > > reports other people having similar results). I can test patches and 
> > > collect information that might be helpful, if you have any ideas.
> > 
> > This has had some discussion on lkml previously [1]. I've been trying to
> > work on a fix, but the current iteration has problems, and I haven't
> > been able to get testers to provide the logs I've requested to help me
> > see what's going wrong. If you'd like to help by providing logs from the
> > most recent test build on the bug you linked to (or using the patches
> > from that build) that would be great. I unfortunately don't have any
> > large-sector devices to test with and cannot reproduce the problems on
> > 512-byte sector devices.
> 
> Sure, I'll try the comment #36 patch set this evening and see what it says.

Okay, I've applied that patch set, and it worked for me without any issues 
thus far. If you're interested in the debugging output from a device that 
doesn't work with vanilla but doesn't oops or panic with that patch set, 
it's attached. I'm using 32-bit x86, if that helps for tracking down 
differences.

	-Daniel
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