Re: loopback blockdevice driver partition support

From: Neil Brown
Date: Mon Jul 24 2006 - 19:28:11 EST

On Tuesday July 25, lkml@xxxxxxxxxxx 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


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