linux-ext4 - Re: e2scrub finds corruption immediately after mounting

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Message-ID: <36ab91c95ce476cdf38977c8f2a8ca4c4fdf2a47.camel@interlinx.bc.ca>
Date: Wed, 10 Jan 2024 08:44:31 -0500
From: "Brian J. Murrell" <brian@...erlinx.bc.ca>
To: linux-ext4@...r.kernel.org
Subject: Re: e2scrub finds corruption immediately after mounting

On Tue, 2024-01-09 at 21:31 -0800, Darrick J. Wong wrote:
> 
> AHA!  This is an ext2 filesystem, since it doesn't have the
> "has_journal" or "extents" features turned on:

This is very odd.  I haven't (intentionally) created a ext2 filesystem
since ext3 became available.  :-)

Moreover /proc/mounts says it's an ext4 filesystem:

/dev/mapper/rootvol_tmp-almalinux8_opt /opt ext4 rw,seclabel,relatime 0 0

Do ext2 filesystems actually mount successfully and quietly when
mounted as ext4?  Surely if one asks to mount an ext2 filesystem as
ext4 mount should fail and complain, yes?

Is https://ext4.wiki.kernel.org/index.php/UpgradeToExt4 still
considered accurate, in terms of an in-place upgrade of ext2 to ext4
being sub-optimal?

Is metadata locality the only thing you don't get with an in-place
upgrade?  If so, how important is that, really?

> Thanks for the
> metadump, it was very useful for root cause analysis.

NPAA.  Thank-you very much for your time and analysis on this issue.

Cheers,
b.

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