linux-ext4 - Preserving a rev 0.0 ext2 filesystem

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Message-ID: <CAMuHMdULrGHfgF+RRGf5gXAc=V3KaB4549NezxEc3CvfsKWOyA@mail.gmail.com>
Date:   Sat, 12 Jan 2019 10:43:10 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Theodore Tso <tytso@....edu>
Cc:     linux-ext4@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Preserving a rev 0.0 ext2 filesystem

Hi Ted,

I'm still regularly using a Linux rev 0.0 ext2 filesystem as a  ramdisk
on m68k, containing mid-90's binaries, from right after the a.out-to-ELF
transition, so I notice if someone breaks old syscall support.

Recently I wanted to change /dev/console on that ramdisk from a symlink
to chardev 5 0.  Unfortunately I cannot mount it, without it being
upgraded automatically to a rev 1.0 ext2 filesystem.  Apparently the
kernel has been doing that upgrade for ages.

Do you have a suggestion how to make that change, while preserving the
ext2 revision?

Thanks!

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds