nbd: Add a function to get the nbd path

Change-Id: I7d121e8c6985a1b355c130248963008da0c63ac7
Signed-off-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-on: https://review.gerrithub.io/433936
Reviewed-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>

include/spdk/nbd.h

@@ -77,6 +77,11 @@ struct spdk_nbd_disk *spdk_nbd_start(const char *bdev_name, const char *nbd_path
  */
 void spdk_nbd_stop(struct spdk_nbd_disk *nbd);
 
+/**
+ * Get the local filesystem path used for the network block device.
+ */
+const char *spdk_nbd_get_path(struct spdk_nbd_disk *nbd);
+
 /**
  * Write NBD subsystem configuration into provided JSON context.
  *

lib/nbd/nbd.c

@@ -966,4 +966,10 @@ err:
 	return NULL;
 }
 
+const char *
+spdk_nbd_get_path(struct spdk_nbd_disk *nbd)
+{
+	return nbd->nbd_path;
+}
+
 SPDK_LOG_REGISTER_COMPONENT("nbd", SPDK_LOG_NBD)