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Date: Sat, 19 Jan 2013 23:04:48 +0900
Message-ID: <m21udhxo8v.wl%morita.kazutaka@gmail.com>
From: MORITA Kazutaka <morita.kazutaka@gmail.com>
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Subject: Re: [Qemu-devel] [Openstack][Sheepdog][Libvirt][Qemu]Add a new
	block storage driver by Libvirt/Qemu way for Openstack
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To: harryxiyou <harryxiyou@gmail.com>
Cc: openstack-dev@lists.launchpad.org, sheepdog <sheepdog@lists.wpkg.org>, Kazutaka Morita <morita.kazutaka@gmail.com>, qemu-devel@nongnu.org, openstack@lists.launchpad.net, libvir-list@redhat.com, cloudxy@googlegroups.com, Liu Yuan <namei.unix@gmail.com>, Kang Hua <kanghua151@gmail.com>

At Sat, 19 Jan 2013 16:47:37 +0800,
harryxiyou wrote:
> 
> Hi all,
> 
> I wanna add a new block storage driver by Libvirt/Qemu way for Openstack, which
> is as same as Sheepdog driver for Openstack. So i think the theories
> are like this.
> 
> 1, In the Openstack Nova branch, Openstck driver call libvirt client
> and send parameters
> to libvirt client.(From this point, i should modify Openstack Nova
> source codes. They are
> a, nova/nova/virt/libvirt/driver.py    add new driver way
> b, /OpenStack/nova/nova/tests/test_libvirt.py  add new driver test)
> 
> 2, According to own protocol, libvirt client in Openstack Nova branch
> send parameters to
> Libvirt server.(From this point, i should modify libvirt library to
> let libvirt library support this
> new driver like Sheepdog).
> 
> 3, Libvirt server call Qemu interfaces to send parameters to
> Qemu.(From this point, i should
> modify Qemu source codes to let Qemu support this new driver like Sheepdog).
> 
> 4, In Openstack Cinder branch, Openstack driver use Qemu commands to
> create this new volumes
> to Qemu.(From this point, i should modify Openstack Cinder branch
> source codes like this.
> a, Add new driver file
> /OpenStack/cinder/cinder/volume/drivers/new_driver.py like Sheepdog.py
> b, Change file /OpenStack/cinder/cinder/tests/test_drivers_compatibility.py
> to test new driver).
> 
> 5, At last, i should also modify
> /OpenStack/manuals/doc/src/docbkx/openstack-compute-admin/tables/hypervisors-nova-conf.xml
> to configure this new driver.
> 
> Are my theories right? Should i do any other stuffs? Could anyone give
> me any other suggestions?

If you do the above work, I think you can use your file system with
OpenStack.

But I suggest doing them step by step.  If your file system is not
supported in QEMU, I think libvirt won't support it.  If libvirt
doesn't support it, OpenStack shouldn't support it too.

Thanks,

Kazutaka