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

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Message-Id: <201206172320.10272.Martin@lichtvoll.de>
Date:	Sun, 17 Jun 2012 23:20:10 +0200
From:	Martin Steigerwald <Martin@...htvoll.de>
To:	jdow <jdow@...thlink.net>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	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

Am Sonntag, 17. Juni 2012 schrieb jdow:
> On 2012/06/17 09:36, Geert Uytterhoeven wrote:
> > 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...
[…]
> Note that the work I did on the Linux RDB code eons ago took full
> cognizance of the physical and virtual block sizes.
[…]
> I've asked Martin for a digital copy of his RDBs and what he thinks the
> partition(s) should look like. I should also be told whether the disk
> is supposed to be solely Amiga OSs or not. I gather it's not.

Its all in the bug report. profile-binary.img should be it.

Its small so I attach it.

Meanwhile I try to get the currently supported maximum disk size out from 
the OS 4 developers. Maybe JXFS is playing tricks that other filesystems do 
not play or simply has a different implementation.

Thanks,
-- 
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7

Download attachment "profile-binary.img" of type "application/octet-stream" (2048 bytes)