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

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Date:   Wed, 15 Jan 2020 13:02:21 -0500
From:   Jeff Mahoney <jeffm@...e.com>
To:     Jan Kara <jack@...e.cz>, Randy Dunlap <rdunlap@...radead.org>
Cc:     Michael Brunnbauer <brunni@...estate.de>,
        linux-kernel@...r.kernel.org, reiserfs-devel@...r.kernel.org
Subject: Re: reiserfs broke between 4.9.205 and 4.9.208

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

-- 
Jeff Mahoney
Director, SUSE Labs Data & Performance



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