Currently RBD doesn't allow deleting volumes with snapshots or volume
dependencies. This causes Cinder API errors on delete calls that should
succeed.
When using the RBD v2 clone api, deleting a volume that has a snapshot
in the trash space raises a busy exception.
In order to solve this, this patch removes the proactive VolumeIsBusy
exception raise and calls the trash operation which should succeed when
the volume has dependencies.
In addition to this code it's important to enable the Ceph Trash auto
purge. Otherwise Ceph may end up with a couple of images in trash
namespace for a while. However, this approach is the lesser of 2 evils
because the user will be able to delete volumes with dependencies
while the operator could check the trash namespace and manually purge
the images. It is definitely better to potentially trouble 1 person
(operator) that didn't read the release notes once than troubling
every single user.
Closes-Bug: #1941815
Co-Author: Eric Harney <eharney@redhat.com>
Change-Id: I5dbbcca780017b358600016afca8a9424aa137fd
