linux-ext4 - Re: problem with tune2fs after ext4 godown

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Message-ID: <CAOQ4uxhu9rNBByXwZifcf=mmDekGwu8H4s8GsMrFMcanp-7A5Q@mail.gmail.com>
Date:   Fri, 31 Aug 2018 17:28:43 +0300
From:   Amir Goldstein <amir73il@...il.com>
To:     Chengguang Xu <cgxu519@....com>
Cc:     Chengguang Xu <cgxu519@...oud.com>, Eryu Guan <eguan@...hat.com>,
        fstests <fstests@...r.kernel.org>,
        Ext4 <linux-ext4@...r.kernel.org>, Theodore Tso <tytso@....edu>
Subject: Re: problem with tune2fs after ext4 godown

[switching over to ext4 list]

On Fri, Aug 31, 2018 at 5:19 PM cgxu519 <cgxu519@....com> wrote:
>
>
> Hi Amir,
>
> It seems godown will cause side effect on ext4/tune2fs, mount an ext4
> filesystem after running godown,
> then tune2fs -l <dev> complains like below. so definitely it will not
> pass d_type check.
>
>
> [root@...1 xfstests-dev]# tune2fs -l /dev/mapper/test-test1
> tune2fs 1.44.2 (14-May-2018)
> tune2fs: Superblock checksum does not match superblock while trying to
> open /dev/mapper/test-test1
> Couldn't find valid filesystem superblock.
>
>

Chengguang,

Bringing this to the attention of ext4 developers,
can you please re-iterate the reproducer (without the mention of
overlayfs and genereic/474) to demonstrate the problem.

And please try to avoid "top posting".

Thanks,
Amir.