[Qemu-devel] Citrix VHD implementation

[Philipp Schmid]

Hi,

as some of you might know, citrix has open sourced the library they  
use to read and write to VHD disk images.

I'm trying to implementing a block-vhd driver on top of libvhd, but my  
C knowledge is very limited as I haven't written any code in C for a  
long time.

What I already have is a git repo with the libvhd code extracted from  
the xen-unstable tree with the blocktap2 patches applied.
libvhd also comes with vhd-util, a utility to create and modify vhd  
images.
I have only tried to compile it on ubuntu 8.10, so it might not work  
on your system.

The git repo is hosted on github: http://github.com/schmidp/libvhd/tree/master

Are there any docs about how to implement a block driver for qemu?
As far as I have seen from the qemu code, block_int.h defines the  
interface and you register your driver in block.c, but that is all  
I've found out so far.

I will try to implement a synchrones driver first as it seems more  
simple...


greets Philipp

ps: I'm not affiliated with citrix in any way