linux-kernel - Re: Partitions: Amiga RDB partition on 2 TB disk way too big, while OK in AmigaOS 4.1

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Date:	Sun, 17 Jun 2012 18:36:41 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Martin Steigerwald <Martin@...htvoll.de>
Cc:	jdow <jdow@...thlink.net>, linux-kernel@...r.kernel.org,
	Jens Axboe <axboe@...nel.dk>, linux-m68k@...r.kernel.org
Subject: Re: Partitions: Amiga RDB partition on 2 TB disk way too big, while
 OK in AmigaOS 4.1

On Sun, Jun 17, 2012 at 2:58 PM, Martin Steigerwald <Martin@...htvoll.de> wrote:
> Am Sonntag, 17. Juni 2012 schrieb jdow:
> | JXFS 64 bit file system
> |
> | With AmigaOS 4.x a new file system has been introduced called JXFS. It is
> | a totally new 64 bit file system that supports partitions up to 16 TB in
> | size. It is a modern journalling file system, which means that it reduces
> | data loss if data writes to the disk are interrupted. It is the fastest
> | and most reliable file system ever created for AmigaOS.
>
> http://www.amigaos.net/content/1/features
>
> Well I asked AmigaOS 4 developers about this issue as well. Lets see what
> they say about 2 TB limits.

16 TB = 2 TB * 8. Perhaps they increased the block size from 512 to 4096?

block/partitions/amiga.c reads the block size from
RigidDiskBlock.rdb_BlockBytes,
but after conversion to 512-byte blocks, all further calculations are done on
"int", so it will overflow for disks larger than 2 TiB.

Note that in your profile-binary.img, the field is 0x200, i.e. 512
bytes per block,
so I'll have to get a deeper look into your RDB first...

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
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