Updated openstack/openstack
Project: openstack/nova  74ed140d770d00b2188f727173b08d8ec89c2a7a

libvirt: Make sure volumes are well detected during block migration

Current implementation of live migration in libvirt incorrectly includes
block devices on shared storage (e.g., NFS) when computing destination
storage requirements. Since these volumes are already on shared storage
they do not need to be migrated. As a result, migration fails if the
amount of free space on the shared drive is less than the size of the
volume to be migrated. The problem is addressed by adding a
block_device_info parameter to check_can_live_migrate_source() to allow
volumes to be filtered correctly when computing migration space
requirements.

This only fixes the issue on libvirt: it is unclear whether other
implementations suffer from the same issue.

Thanks to Florent Flament for spotting and fixing an issue while trying out
this patch.

Co-Authored-By: Florent Flament <florent.flament@cloudwatt.com>
Change-Id: Iac7d2cd2a70800fd89864463ca45c030c47411b0
Closes-Bug: #1356552