linux-kernel - Re: moving affs + RDB partition support to staging? (was: Re: Moving unmaintained filesystems to staging)

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Message-ID: <4119984.9IAShGbTL3@merkaba>
Date:   Fri, 27 Apr 2018 10:01:04 +0200
From:   Martin Steigerwald <martin@...htvoll.de>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Matthew Wilcox <willy@...radead.org>,
        David Sterba <dsterba@...e.cz>,
        Linux FS Devel <linux-fsdevel@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Jens Axboe <axboe@...nel.dk>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Joanne Dow <jdow@...thlink.net>
Subject: Re: moving affs + RDB partition support to staging? (was: Re: Moving unmaintained filesystems to staging)

Geert Uytterhoeven - 26.04.18, 13:08:
> On Thu, Apr 26, 2018 at 12:28 PM, Martin Steigerwald
> 
> <martin@...htvoll.de> wrote:
> > You probably put your stick into a cave with ancient sleeping
> > dragons 
> > 
> > Added in linux-m68k mailing list, as they likely have an opinion on
> > how to treat affs + RDB partition support. Also added in Jens Axboe
> > about patching that RDB support broken with 2 TB or larger
> > harddisks issue which had been in Linux kernel for 6 years while a
> > patch exists that to my testing back then solves the issue.
[…]
> If there are bugs in the RDB parser that people run into, they should
> be fixed.
> If there are limitations in the RDB format on large disks, that's
> still not a reason to move it to staging (hi msdos partitioning!).

What I ran into was *not* a limitation in the RDB format, but a bug in 
the Linux implementation on it. After Joanne Dow´s change the 2 TB disk 
was detected and handled properly by Linux. Also AmigaOS 4.x handles 
those disks just well and I think also AmigaOS 3.1/3.5/3.9 supported 
them, but I am not sure on the details on that, it has been a long time 
since I last booted one of my Amiga systems.

Many classic Amiga users may not deal with such large disks, but AmigaOS 
4 users probably still, and some of them may run Linux on their PowerPC 
motherboards as well.

So I think the issue is worth fixing and am looking into submitting the 
fix, which looks pretty straight-forward to me upstream unless someone 
bets me to it.

Thanks,
-- 
Martin