linux-kernel - Re: loopback blockdevice driver partition support

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Date:	Tue, 25 Jul 2006 09:29:17 +1000
From:	Neil Brown <neilb@...e.de>
To:	Kasper Sandberg <lkml@...anurb.dk>
Cc:	LKML Mailinglist <linux-kernel@...r.kernel.org>
Subject: Re: loopback blockdevice driver partition support

On Tuesday July 25, lkml@...anurb.dk wrote:
> hello.. i was wondering if someone may have done some work to make the
> loopback driver support partitions..
> 
> i found that a guy had written a nice script that used sfdisk and
> dmsetup to use device mapper on a loopback image of an entire harddrive
> (using DOS partition table ofcourse) to create device mapper
> "partitions".
> 
> though this doesent quite meet my requirements, as i need to read an
> image of an amiga disk..
> 
> therefore it would seem like a good idea to make the loopback driver
> work with linux's partition table support, since it already supports
> this.
> 
> if anyone has done some work in this, please mail me, and possibly i can
> continue it if wanted. just want to know if anyone already has done
> something like it before i try at it myself..
> 

You could try wrapping an md/linear around it
 
mkdir -p /dev/md
mdadm -Bf -c4 -l linear -n1 -ap /dev/md/d0 /dev/loop0

then look at partitions in /dev/md/d0pN

NeilBrown

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