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NetApp: Fix race condition in 7-mode iSCSI driver with DFM.
A race condition was discovered in the driver while creating or deleting multiple volumes in a very short interval of time (can be reproduced by making successive API calls to Cinder). This fix decorates the methods responsible for race condition with a synchronized() decorator. The problem was with the management software: DFM, and in principle, there should not be two processes trying to modify the DFM dataset object at the same time. This patch prevents from such a possibility. Fixes bug 1091480 Change-Id: I11cfc8868171acec356f4140aba52b8078d109df
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