nvdimm_namespace_disk_name
nvdimm_namespace_disk_name(ndns, btt->btt_disk->disk_name);
EXPORT_SYMBOL(nvdimm_namespace_disk_name);
const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
nvdimm_namespace_disk_name(ndns, disk->disk_name);