linux-ext4 - Re: e2fsck doesn't finish

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Date:   Sun, 23 Apr 2017 16:07:29 +0200
From:   Julius Schwartzenberg <julius.schwartzenberg@...il.com>
To:     Andreas Dilger <adilger@...ger.ca>
Cc:     Theodore Ts'o <tytso@....edu>, Eric Sandeen <sandeen@...hat.com>,
        linux-ext4 <linux-ext4@...r.kernel.org>
Subject: Re: e2fsck doesn't finish

Andreas Dilger wrote:
> It would be useful to know which feature(s) that Fedora 25 enabled that
> Ubuntu 16.04 didn't understand.  You could use something like:
> 
>     dumpe2fs -h /dev/XXX | grep -i feature
> 
> under Ubuntu.  Typically, the code shouldn't be enabling any feature on
> the filesystem without an explicit request from the admin.

I expect that Ubuntu's kernel (4.4.0) supports more features than its
e2fsck as I can mount it now. Ubuntu 16.04 comes with e2fsprogs version
1.42.13. The feature that that version says it doesn't support is
inline_data.

> Also, the "failed to mount" case should print something to the console
> logs about an unsupported feature, which would help isolate the problem.

Yes, it printed it couldn't mount the filesystem as ext3 originally, but
I changed /etc/fstab accordingly.

I have always been quite ignorant on filesystem upgrades and features
supported by either the kernel or e2fsprogs and upgrades/downgrades of
existing filesystems as usually everything just works.
I expect that the upgrade from ext3 to ext4 was triggered by Fedora's
installer (not e2fsprogs) and that dual boot configurations are less
tested in general.

Best regards,
Julius