volume create race condition protection

Bug #1251334 reported by Edward Hope-Morley on 2013-11-14
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Edward Hope-Morley

Bug Description

Creating a volume from another volume or snapshot is currently prone to being interrupted by a concurrent delete of the dependant volume or snapshot. Concern over this was also raised within the new taskflow implementation:


Changed in cinder:
status: New → In Progress
assignee: nobody → Edward Hope-Morley (hopem)
Edward Hope-Morley (hopem) wrote :

Applying this patch and then doing a create from snapshot and delete snapshot concurrenlty will trigger the expected exception.

Changed in cinder:
importance: Undecided → Medium
milestone: none → icehouse-1
Thierry Carrez (ttx) on 2013-12-04
Changed in cinder:
milestone: icehouse-1 → icehouse-2

Reviewed: https://review.openstack.org/56442
Committed: http://github.com/openstack/cinder/commit/4f6e5fcc252799e2b9207b6ef2b58b52a7a93563
Submitter: Jenkins
Branch: master

commit 4f6e5fcc252799e2b9207b6ef2b58b52a7a93563
Author: Edward Hope-Morley <email address hidden>
Date: Thu Nov 14 19:00:00 2013 +0000

    Adds lock for create from vol/snap to avoid race conditions

    This patch protects create from volume/snapshot by using a
    lockfile to protect the operation from concurrent deletes of
    the volume/snapshot used in the create operation.

    Currently, if a volume/snapshot is deleted while a volume is
    being created from it that delete may complete during the
    create operation thus leaving the new volume in error or stuck
    state. This lock will ensure that:

    (a) if a create of VolA from snap/volB is in progress, any
        delete requests for snap/volB will wait until the create
        is complete.

    (b) if a delete of snap/volA is in progress, any create from
        snap/volA will wait until snap/volA delete is complete.

    Co-authored-by: Takashi Natsume <email address hidden>
    Closes-Bug: 1251334
    Change-Id: Ie4bc0af789ab232593f55aa2f6b34345eb9b9929

Changed in cinder:
status: In Progress → Fix Committed
Thierry Carrez (ttx) on 2014-01-22
Changed in cinder:
status: Fix Committed → Fix Released
Thierry Carrez (ttx) on 2014-04-17
Changed in cinder:
milestone: icehouse-2 → 2014.1
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