Multiattach with Image volume backed

[Aleksey Myltsev]

If we use several glance-api instances and store images in cinder than during creation several VM nova-compute request image from glance-api. For increasing speed of VM creation we allow multiattach for volumes with images. Looks like glance_store use attach/detach workflow v1(https://github.com/openstack/cinder/blob/master/doc/source/contributor/attach_detach_conventions.rst) not attach/detach workflow v2(https://github.com/openstack/cinder/blob/master/doc/source/contributor/attach_detach_conventions_v2.rst). In this case glance_store can not detach volume because it does not have attachment_id.

[Dan Smith (danms)]

I believe this does what is described here:

https://review.opendev.org/c/openstack/glance_store/+/782200

and it's been sitting waiting for reviews for a while now :(

[Rajat Dhasmana (whoami-rajat)]

Attachment v2 flow addressed by: https://review.opendev.org/c/openstack/glance_store/+/782200
Multiattach handling addressed by: https://review.opendev.org/c/openstack/glance_store/+/786410

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/glance_store/+/786410
Committed: https://opendev.org/openstack/glance_store/commit/ecda7f640fe4e807ba07981abfc1a637ddb496cd
Submitter: "Zuul (22348)"
Branch: master

commit ecda7f640fe4e807ba07981abfc1a637ddb496cd
Author: whoami-rajat <email address hidden>
Date: Thu Apr 15 09:17:59 2021 -0400

    Add volume multiattach handling

    We implemented cinder's new attachment API support with patch[1].
    It was needed to add multiattach volume handling added with this
    patch.
    There is no special configuration change or user interference needed.
    If a volume is of a multiattach type, then it will be handled as
    a multiattach volume.

    [1] https://review.opendev.org/c/openstack/glance_store/+/782200

    Implements: blueprint attachment-api-and-multiattach-support
    Closes-Bug: #1904546

    Change-Id: Iffb825492a20fd877476acad05f817b399072f01

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/glance_store 2.7.0 release.