change CreateOpts from structure to map to avoid default null values
diff --git a/openstack/blockstorage/v1/volumes/requests.go b/openstack/blockstorage/v1/volumes/requests.go
index b1f45cd..34ae20e 100644
--- a/openstack/blockstorage/v1/volumes/requests.go
+++ b/openstack/blockstorage/v1/volumes/requests.go
@@ -11,7 +11,7 @@
 	if err != nil {
 		return v, err
 	}
-	url := c.GetVolumeURL()
+	url := c.GetVolumesURL()
 	_, err = perigee.Request("POST", url, perigee.Options{
 		Results: &v,
 		ReqBody: map[string]interface{}{
diff --git a/openstack/blockstorage/v1/volumes/volumes.go b/openstack/blockstorage/v1/volumes/volumes.go
index 35c416b..e7eaeea 100644
--- a/openstack/blockstorage/v1/volumes/volumes.go
+++ b/openstack/blockstorage/v1/volumes/volumes.go
@@ -1,7 +1,9 @@
 package volumes
 
 type Volume map[string]interface{}
+type CreateOpts map[string]interface{}
 
+/*
 type CreateOpts struct {
 	Availability_zone   string            `json:"size"`
 	Source_volid        string            `json:"source_volid"`
@@ -14,3 +16,4 @@
 	Bootable            bool              `json:"bootable"`
 	Metadata            map[string]string `json:"metadata"`
 }
+*/