diff --git a/go/topology/topology.go b/go/topology/topology.go
index a81829bb6..cfce0c9a8 100644
--- a/go/topology/topology.go
+++ b/go/topology/topology.go
@@ -109,7 +109,7 @@ func (t *Topology) NextVolumeId() storage.VolumeId {
 	return next
 }
 
-func (t *Topology) hasWritableVolume(option *VolumeGrowOption) bool {
+func (t *Topology) HasWritableVolume(option *VolumeGrowOption) bool {
 	vl := t.GetVolumeLayout(option.Collection, option.ReplicaPlacement, option.Ttl)
 	return vl.GetActiveVolumeCount(option) > 0
 }
diff --git a/go/weed/weed_server/master_server_handlers.go b/go/weed/weed_server/master_server_handlers.go
index be2a7ca7e..d7f1f4ce3 100644
--- a/go/weed/weed_server/master_server_handlers.go
+++ b/go/weed/weed_server/master_server_handlers.go
@@ -78,7 +78,7 @@ func (ms *MasterServer) dirAssignHandler(w http.ResponseWriter, r *http.Request)
 		return
 	}
 
-	if !ms.Topo.hasWritableVolume(option) {
+	if !ms.Topo.HasWritableVolume(option) {
 		if ms.Topo.FreeSpace() <= 0 {
 			w.WriteHeader(http.StatusNotFound)
 			writeJsonQuiet(w, r, operation.AssignResult{Error: "No free volumes left!"})
@@ -86,7 +86,7 @@ func (ms *MasterServer) dirAssignHandler(w http.ResponseWriter, r *http.Request)
 		} else {
 			ms.vgLock.Lock()
 			defer ms.vgLock.Unlock()
-			if !ms.Topo.hasWritableVolume(option) {
+			if !ms.Topo.HasWritableVolume(option) {
 				if _, err = ms.vg.AutomaticGrowByType(option, ms.Topo); err != nil {
 					writeJsonQuiet(w, r, operation.AssignResult{Error: "Cannot grow volume group! " + err.Error()})
 					return
diff --git a/go/weed/weed_server/master_server_handlers_admin.go b/go/weed/weed_server/master_server_handlers_admin.go
index 080405e54..1a2c6b8e0 100644
--- a/go/weed/weed_server/master_server_handlers_admin.go
+++ b/go/weed/weed_server/master_server_handlers_admin.go
@@ -143,7 +143,7 @@ func (ms *MasterServer) deleteFromMasterServerHandler(w http.ResponseWriter, r *
 	}
 }
 
-func (ms *MasterServer) hasWritableVolume(option *topology.VolumeGrowOption) bool {
+func (ms *MasterServer) HasWritableVolume(option *topology.VolumeGrowOption) bool {
 	vl := ms.Topo.GetVolumeLayout(option.Collection, option.ReplicaPlacement, option.Ttl)
 	return vl.GetActiveVolumeCount(option) > 0
 }