nova/releasenotes/notes/swap-volume-policy-9464e97a...

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---
upgrade:
- The default policy for updating volume attachments, commonly referred to as
swap volume, has been changed from ``rule:admin_or_owner`` to
``rule:admin_api``. This is because it is called from the volume service
when migrating volumes, which is an admin-only operation by default, and
requires calling an admin-only API in the volume service upon completion.
So by default it would not work for non-admins.