HyperV Compute driver doesn't return disk stats properly

[Luis Fernández Álvarez]

The current version of the HyperV Compute driver returns the disk stats about the C: drive always. The information about the disk stats should point to the disk that is storing the instances.

This problem leads to an inconsistent node status in the controller, not reflecting the current usage.

In order to solve this, it's proposed to extract the disk drive from the config parameter "instance_path".

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/15879

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/15879
Committed: http://github.com/openstack/nova/commit/3d09a28ceca8bf0e594fc103f977e844071e3ea8
Submitter: Jenkins
Branch: master

commit 3d09a28ceca8bf0e594fc103f977e844071e3ea8
Author: Luis Fernandez Alvarez <email address hidden>
Date: Mon Nov 12 14:35:12 2012 +0100

    Fixed HyperV to get disk stats of instances drive

    It fixes bug 1077922

    The current version of the HyperV Compute driver was returning the disk stats about the C: drive always.

    This patch makes HyperV driver extract the current drive from the flag 'instances_path'.

    In order to optimize the procedure, the disk stats extraction is also unified in one method.

    Change-Id: I4920cf2cc07d0f514c0358144b7bceb15d439a63