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Re: [Qemu-devel] [PATCH] Modify qemu-img to mount locally disk image usi

From: Anthony Liguori
Subject: Re: [Qemu-devel] [PATCH] Modify qemu-img to mount locally disk image using NBD (v2)
Date: Tue, 11 Mar 2008 23:55:52 -0500
User-agent: Thunderbird (X11/20080227)

Fabrice Bellard wrote:
Laurent Vivier wrote:
This patch is a new version of qemu-img using NBD device to mount Qemu
disk image.

To not hang on UP system, it needs following patch:
If you want to use loop to see partitions, you need this patch:
otherwise use kpartx (see kpartx package of your distro).

This patch implements in qemu-img the client and the server of the nbd protocol.
Moreover, to avoid to specify a port to use, it creates a UNIX socket instead of
a INET socket.

It adds two actions to qemu-img:
- bind, to bind a disk image to a NBD device,

  qemu-img bind [-d] [-f fmt] device filename

     ('-d' to daemonize)

- unbind, to unbind it.

  qemu-img unbind device

Perhaps adding a new specialized tool would be better as there is no
direct relation with qemu-img.

I've been maintaining a separate tool for a while now (qemu-nbd) that uses the QEMU block driver code. If there's interest in merging it, I'll happily submit patches.


Anthony Liguori


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