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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 <natsume.takashi@lab.ntt.co.jp> Closes-Bug: 1251334 Change-Id: Ie4bc0af789ab232593f55aa2f6b34345eb9b9929
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