sheepdog driver doesn't report capabilities to the scheduler

[Wenhao Xu]

branch: master
commit: e9978269901658f5b463f5096661afde5ce8bb58

Sheepdog driver doesn't implement "get_volume_stats" method which means no capabilities will be notified to the scheduler.

So the scheduler cannot find valid hosts to create the volume.

Err msg is shown in the following:

2013-03-02 22:51:23,439.439 WARNING cinder.scheduler.filters.capacity_filter [req-dd173c0c-3ecf-41a2-b659-6cf9145987d7 6c7e3a114d3a4df19d73e38a14869b38 618ce001837c4e9aa42a7bf191eea240] Free capacity not s
et;volume node info collection broken.
2013-03-02 22:51:23,440.440 WARNING cinder.scheduler.manager [req-dd173c0c-3ecf-41a2-b659-6cf9145987d7 6c7e3a114d3a4df19d73e38a14869b38 618ce001837c4e9aa42a7bf191eea240] Failed to schedule_create_volume: N
o valid host was found.

The method should return capabilities with attributes: total_space, total_avail, total_capacity_gb, free_capacity_gb, etc.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/23346

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/23346
Committed: http://github.com/openstack/cinder/commit/1867b89a53e3e46394e9db80e0dc82471661068c
Submitter: Jenkins
Branch: master

commit 1867b89a53e3e46394e9db80e0dc82471661068c
Author: Wenhao Xu <email address hidden>
Date: Sun Mar 3 01:19:08 2013 +0800

    Add get_volume_stats in the sheepdog driver.

    1. Allow sheepdog driver to report capabilities to the scheduler.
    2. add the initial test_sheepdog.py

    Fixes Bug #1140162

    Change-Id: I6fb1fb6714ab4ae9878b593e6eee0a94d95ef29f