linux-kernel - Re: [PATCH] ubifs: Fix O_TMPFILE corner case in ubifs

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Message-ID: <CAOQ4uxivNMjZJ3T_NmPHXNveXbs+QX=PxUkHagu9VH5Ev5Uecg@mail.gmail.com>
Date:   Tue, 11 Apr 2017 18:04:50 +0300
From:   Amir Goldstein <amir73il@...il.com>
To:     Richard Weinberger <richard@....at>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        linux-mtd@...ts.infradead.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Artem Bityutskiy <dedekind1@...il.com>,
        "stable [v4.9]" <stable@...r.kernel.org>,
        Ralph Sennhauser <ralph.sennhauser@...il.com>
Subject: Re: [PATCH] ubifs: Fix O_TMPFILE corner case in ubifs_link()

On Tue, Apr 11, 2017 at 1:50 PM, Richard Weinberger <richard@....at> wrote:
> Hi!
>
> Am 11.04.2017 um 12:20 schrieb Amir Goldstein:
>> On Thu, Apr 6, 2017 at 3:26 PM, Richard Weinberger <richard@....at> wrote:
>>> Am 06.04.2017 um 14:09 schrieb Richard Weinberger:
>>>>> Were you able to make any progress? still working on this?
>>>>> If this is too complicated to get in for this cycle, better send a patch
>>>>> to disable O_TMPFILE support for ubifs and fix the problem properly on
>>>>> followup merge cycle.
>>>>> Because right now ubifs O_TMPFILE support is broken and breaks overlayfs mount.
>>>>
>>>> I have a test and currently testing it. As it looks the situation is less worse
>>>> than I thought first. :-)
>>>
>>> s/test/patch :)
>>>
>>
>> Richard,
>>
>> Maybe it's not my business to interfere with ubifs development and I
>> haven't seen your patch.
>>
>> But on the face of it, it doesn't sound like fixing O_TMPFILE is a
>> trivial fix, so not sure
>> it is wise to send a patch for -rc7?...
>>
>> How about sending the patch to disable O_TMPFILE for -rc7 and queuing
>> your fix for v4.12?
>> Without any patch, v4.11 is going to have a regression with overlayfs+ubifs.
>
> No need to panic.

Who? me?  ;-)

> I verified some stuff and my first patch does the right thing but not in a nice way,
> except in oneerror patch. In will land in -rc7.
>

That patch looks simple enough.
I though you had a more complex patch in mind.

> For the next merge window I prepare patches that introduce a new journal function
> for handling tmpfiles.
>

Thanks for the update.
Cheers,
Amir.