nova/releasenotes/notes/bug-1967157-extend-encrypted.yaml
Gorka Eguileor 8fbaeba11f Fix extending non LUKSv1 encrypted volumes
Patch fixing bug #1861071 resolved the issue of extending LUKS v1
volumes when nova connects them via libvirt instead of through os-brick,
but nova side still fails to extend in-use volumes when they don't go
through libvirt (i.e., LUKS v2).

The logs will show a very similar error, but the user won't know that
this has happened and Cinder will show the new size:

 libvirt.libvirtError: internal error: unable to execute QEMU command
 'block_resize': Cannot grow device files

There are 2 parts to this problem:

- The device mapper device is not automatically extended.
- Nova tries to use the encrypted block device size as the size of the
  decrypted device.

This patch leverages the "extend_volume" method in os-brick connectors
to extend the device mapper device, after the encrypted device has been
extended, and use the size of the decrypted volume for the block_resize
operation.

Related change: I351f1a7769c9f915e4cd280f05a8b8b87f40df84
Closes-Bug: #1967157
Change-Id: Ia1411f11ec4bf44af6a42d5f96c8a0903846ed66
2022-05-12 16:54:04 +00:00

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---
fixes:
- |
Extending attached encrypted volumes that failed before because they were
not being decrypted using libvirt (any other than LUKS) now work as
expected and the new size will be visible within the instance. See
`Bug 1967157`_ for more details.
.. _Bug 1967157: https://bugs.launchpad.net/nova/+bug/1967157