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@Patrizio/Joel
Couple questions, like how would we like to see the info passed to Cinder to indicate that the Volume has been formatted to set the proposed flag?  This is part of the reason why this was all handled on the Nova side to begin with, that's where the encryption *stuff* happens for the most part, and given we don't currently have any mechanism for Nova sending updates back to Cinder there's a good deal of  plumbing needed here I think.

Also, is anybody interested enough to work on this?

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https://bugs.launchpad.net/bugs/1372375

Title:
  Attaching LVM encrypted volumes (with LUKS) could cause data loss if
  LUKS headers get corrupted

Status in Cinder:
  New
Status in OpenStack Compute (Nova):
  Invalid
Status in OpenStack Security Advisories:
  Won't Fix

Bug description:
  I have doubts about the flow of the volume attaching operation, as
  defined in /usr/lib/python2.6/site-
  packages/nova/volume/encryptors/luks.py.

  If the device is not recognized to be a valid luks device, the script is luks formatting it! So if for some reason the luks header get corrupted, it erases the whole data.
  To manage corrupted headers there are the 

      cryptsetup luksHeaderBackup

  and

      cryptsetup luksHeaderRestore

  commands that respectively do the backup and the restore of the
  headers.

  I think that the process has to be reviewed, and the luksFormat
  operation has to be performed during the volume creation.

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