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

Dmitry Guryanov dguryanov at virtuozzo.com
Wed Oct 28 06:18:39 UTC 2015


Can we discuss this on the summit?

As I promised, I've written a blueprint for this change:


On 10/14/2015 03:57 AM, Dmitry Guryanov wrote:
> 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.
> Here is a draft version of a patch:
> https://review.openstack.org/#/c/234359/
> Although there are problems in it, most of the operations with volumes 
> work and there are only about 10 fails in tempest.
> I'd like to discuss this approach before further work on the patch.
> -- 
> Dmitry Guryanov
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