The CSI-Addons project hosts extensions to the CSI specification that provide advanced storage operations.
The Network Fencing specification provides a mechanism that Storage Providers can implement to network-fence any client using corresponding CIDR blocks.
The Reclaim Space specification defines an extension to the CSI Specification that will enable storage vendors (SP) to develop controllers/plugins that can free unused storage allocations from existing volumes.
The Volume Replication specification provides a mechanism that Storage Providers can implement to support async-replication which can be used for disaster recovery operations.