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[OpenStack Infra <1642628@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/398479
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=d55c5136d0f7ece722db889a4375133e827411c0
Submitter: Jenkins
Branch:    master

commit d55c5136d0f7ece722db889a4375133e827411c0
Author: Lee Yarwood <lyarwood@xxxxxxxxxx>
Date:   Wed Nov 16 15:51:02 2016 +0000

    libvirt: Detach volumes from a domain before detaching any encryptors
    
    I983f80822a5 introduced retry logic around the detaching of volumes from
    a libvirt domain. However it also reordered the surrounding code so that
    we attempt to detach any encryptors from a volume first while the volume
    is still attached to the domain. This can lead to `Device or resource
    busy` errors if the volume is still being used by the instance when we
    attempt to detach the encryptors.
    
    Closes-bug: #1642628
    Change-Id: Ia0f8e725ec8a0fbc44bd4592b021dea978cf4e4f


** Changed in: nova
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1642628

Title:
  Detaching encryptors from volumes that are still attached to domains
  can result in failure

Status in OpenStack Compute (nova):
  Fix Released

Bug description:
  Description
  ===========
  Detaching encryptors from volumes that are still attached to domains can result in failure.

  Steps to reproduce
  ==================
  - Attach an encrypted volume to an instance.
  - Mount and use the volume within the instance.
  - Attempt to detach the volume via Nova while the volume is in-use within the instance.

  Expected result
  ===============
  The volume is detached.

  Actual result
  =============
  Nova first attempts to detach the encryptors from the volume that is still attached to the libvirt domain. As a result this can fail with `Device or resource busy` as I/O is still in-flight between the instance and volume.

  Environment
  ===========
  1. master, stable/newton.

  2. Which hypervisor did you use?
     Libvirt + KVM

  2. Which storage type did you use?
     LVM / iSCSI + LUKS

  3. Which networking type did you use?
     N/A

  Logs & Configs
  ==============

  Failed to detach an encrypted volume
  https://bugzilla.redhat.com/show_bug.cgi?id=1388417

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