[openstack-dev] [cinder] RemoteFS drivers refactoring: move code, which works with images to separate classes

Dmitry Guryanov dguryanov at virtuozzo.com
Wed Oct 14 13:15:17 UTC 2015

On 10/14/2015 12:09 AM, Sean McGinnis wrote:
> On Tue, Oct 13, 2015 at 07:01:45PM +0000, D'Angelo, Scott wrote:
>> If you create a blueprint and a spec for this, the details can be discussed in the spec.
> Yes, something like this we should definitely have a spec and blueprint
> for. Please write up a spec and propose to the cinder-specs repo so this
> can be discussed and comment on.

OK, I have a blueprint, but haven't written spec yet.

>> -----Original Message-----
>> From: Dmitry Guryanov [mailto:dguryanov at virtuozzo.com]
>> Sent: Tuesday, October 13, 2015 12:57 PM
>> To: OpenStack Development Mailing List; Maxim Nestratov
>> Subject: [openstack-dev] [cinder] RemoteFS drivers refactoring: move code, which works with images to separate classes
>> Hello,
>> RemoteFS drivers combine 2 logical tasks. The first one is how to mount a filesystem and select proper share for a new or existing volume. The second one: how to deal with an image files in given directory (mount
>> point) (create, delete, create snapshot e.t.c.).
>> The first part is different for each volume driver. The second - the same for all volume drivers, but it depends on selected volume format:
>> you can create qcow2 file on NFS or smbfs with the same code.
>> Since there are several volume formats (raw, qcow2, vhd and possibly some others), I propose to move the code, which works with image to separate classes, 'VolumeFormat' handlers.
>> This change have 3 advantages:
>> 1. Duplicated code from remotefs driver will be removed.
>> 2. All drivers will support all volume formats.
>> 3. New volume formats could be added easily, including non-qcow2 snapshots.
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