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[Qemu-devel] block device loopback

From: s[e]th & h[o]lth
Subject: [Qemu-devel] block device loopback
Date: Thu, 1 Jun 2006 18:08:56 +0200


I'm a qemu user and I'm looking for a way to use my virtual target drive inside my host computer.
I've created a file that I'll call hda.disk like this : "dd if=/dev/zer of=hda.disk count=1 bs=1M seek=1023" and i use it like "qemu -hda hda.disk "
The problem i meet is that i can't use this file outside the virtual machine and I'm trying to program a block device driver to read this file as a IDE drive.
The aim of this driver is quite similar to the loop driver but instead of "emulating" a partition, it emulates a IDE Hard Drive and give an access to it via /dev/vdX and it's partition via /dev/vdXpY.
Perhaps you will wonder why i use the qemu's mailing-list for this problem :
- i don't know exactly where i can find a way to achieve this project ;
- i wonder how you read your hda.disk without using qemu ;
- i would like to know how qemu fix the virtual drive property inside the virtual machine (cylinders, sectors, etc...) ;
- i don't know anyone interested by this problem and quite good enough linux driver developer to help me.

Thank you very much and have a nice day !

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