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

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Date:   Thu, 6 Apr 2017 15:06:43 +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 Thu, Mar 30, 2017 at 3:27 PM, Richard Weinberger <richard@....at> wrote:
> Am 30.03.2017 um 13:57 schrieb Adrian Hunter:
>>> Reading deeper into the proved that I was wrong.
>>> AFAIKT UBIFS' journal has currently no way to revive a deleted inode.
>>> So, we have to think about a new solution.
>>
>> Deleting the orphan looks right.  Just need to understand whether the
>> recovery would do the right thing - actually it looks like O_TMPFILE might
>> be OK and in other case we might be failing to remove nodes with sequence
>> numbers greater than the deletion inode.
>
> Sadly it does not the right thing.
> I'm currently investigating why and how to deal with it.
>
> I also managed to trigger that case. :(
>

Richard,

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.

Amir.