nvf_register_file
sdevfd_handle = nvf_register_file(&sdev_cache_ops);
dcfd_handle = nvf_register_file(&devid_cache_ops);
rio_store_handle = nvf_register_file(&rio_store_ops);
nvf_handle_t nvf_register_file(nvf_ops_t *);
puafd_handle = nvf_register_file(&pci_unitaddr_cache_ops);