cinder/releasenotes/notes/fix-remotefs-clone-volume-l...

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fixes:
- |
An incorrect lock in the remotefs code, which is used for the NFS driver,
and other similar drivers, resulted in concurrent clone volume operations
failing. create_cloned_volume now locks on the source volume id, meaning
multiple clone operations from the same source volume are serialized.
A lock in the volume manager flow generally prevents this on normal clone
volume operations, but this clone method in the driver is called for
operations such as cloning from the cinder image-volume cache or cloning
from a cinder backend used as a glance store.