linux-kernel - Re: reiserfs broke between 4.9.205 and 4.9.208

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Date:   Mon, 20 Jan 2020 11:20:46 -0500
From:   Jeff Mahoney <jeffm@...e.com>
To:     Byron Stanoszek <gandalf@...ds.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: reiserfs broke between 4.9.205 and 4.9.208

On 1/20/20 10:03 AM, Byron Stanoszek wrote:
> On Wed, 15 Jan 2020, Jeff Mahoney wrote:
>> On 1/9/20 7:12 AM, Jan Kara wrote:
>>>
>>> Hello,
>>>
>>> On Wed 08-01-20 15:42:58, Randy Dunlap wrote:
>>>> On 1/8/20 11:36 AM, Michael Brunnbauer wrote:
>>>>> after upgrading from 4.9.205 to 4.9.208, I get errors on two different
>>>>> reiserfs filesystems when doing cp -a (the chown part seems to
>>>>> fail) and
>>>>> on other occasions:
>>>>>
>>>>>  kernel: REISERFS warning (device sda1): jdm-20004
>>>>> reiserfs_delete_xattrs: Couldn't delete all xattrs (-95)
>>>>>
>>>>>  kernel: REISERFS warning (device sdc1): jdm-20004
>>>>> reiserfs_delete_xattrs: Couldn't delete all xattrs (-95)
>>>>>
>>>>> This behaviour disappeared after a downgrade to 4.9.205.
>>>>>
>>>>> I understand there have been changes to the file system code but
>>>>> I'm not
>>>>> sure they affect reiserfs, e.g.
>>>>>
>>>>>  https://bugzilla.kernel.org/show_bug.cgi?id=205433
>>>>>
>>>>> Any Idea?
>>>>>
>>>>> Regards,
>>>>>
>>>>> Michael Brunnbauer
>>>>>
>>>>
>>>> Looks to me like 4.9.207 contains reiserfs changes.
>>>>
>>>> Adding CC's.
>>>
>>> Looks like a regression from commit 60e4cf67a582 "reiserfs: fix extended
>>> attributes on the root directory". We are getting -EOPNOTSUPP from
>>> reiserfs_for_each_xattr() likely originally from open_xa_root().
>>> Previously
>>> we were returning -ENODATA from there which error
>>> reiserfs_for_each_xattr()
>>> converted to 0. I don't understand reiserfs xattrs enough to quickly
>>> tell
>>> what should actually be happening after the Jeff's change - naively I'd
>>> think we should just silence the bogus warning in case of EOPNOTSUPP.
>>> Jeff,
>>> can you have a look?
>>>
>>> Also Michael, I'd like to clarify: Does 'cp -a' return any error or
>>> is it
>>> just that the kernel is spewing these annoying warnings?  Because
>>> from the
>>> code reading I'd think that it is only the kernel spewing errors but
>>> userspace should be fine...
>>
>> This error occurs when extended attributes are not enabled on the file
>> system *and* the module is not built with extended attributes enabled.
>> I've sent out the fix for it just now.
>>
>> -Jeff
> 
> Hi Jeff,
> 
> Can you share the patch with us for testing? I haven't seen this hit
> mainline
> yet.

Sure.  I posted it to the reiserfs-devel list last week and Jan Kara
pulled it into his tree for submission to mainline.

It's in linux-next:

https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/fs/reiserfs?id=394440d469413fa9b74f88a11f144d76017221f2

-Jeff

-- 
Jeff Mahoney
Director, SUSE Labs Data & Performance



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