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> [...] I think that Cinder should ask luksFormat to nova at the moment
of volume creation [...]

I agree that approach would be cleaner, but it also forces Cinder to
delegate a significant amount of work to Nova -- it's basically
comparable to attaching a volume to a VM. I'm also not really sure that
(encrypted) volume creation should couple Cinder to Nova. It would
certainly be a significant change from the creation of non-encrypted
volumes.

While it's not optimal, the existing approach is simple -- much simpler
than the alternatives in my opinion.

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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):
  Incomplete
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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