linux-kernel - Re: loopback blockdevice driver partition support

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Message-Id: <1153831941.11477.12.camel@localhost>
Date:	Tue, 25 Jul 2006 14:52:21 +0200
From:	Kasper Sandberg <lkml@...anurb.dk>
To:	Neil Brown <neilb@...e.de>
Cc:	LKML Mailinglist <linux-kernel@...r.kernel.org>
Subject: Re: loopback blockdevice driver partition support

On Tue, 2006-07-25 at 09:29 +1000, Neil Brown wrote:
> 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
Yeah, i ended up doing this, i found that md supports partitions, and
linear was a perfect match for what i needed.

> 
> NeilBrown
> 
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