Merge branch 'master' into support_ssd_volume

weed/topology/data_node.go

@@ -163,7 +163,10 @@ func (dn *DataNode) GetVolumesById(id needle.VolumeId) (storage.VolumeInfo, erro
 }
 
 func (dn *DataNode) GetDataCenter() *DataCenter {
-	return dn.Parent().Parent().(*NodeImpl).value.(*DataCenter)
+	rack := dn.Parent()
+	dcNode := rack.Parent()
+	dcValue := dcNode.GetValue()
+	return dcValue.(*DataCenter)
 }
 
 func (dn *DataNode) GetRack() *Rack {

weed/topology/volume_layout.go

@@ -220,7 +220,7 @@ func (vl *VolumeLayout) ensureCorrectWritables(vid needle.VolumeId) {
 
 func (vl *VolumeLayout) isAllWritable(vid needle.VolumeId) bool {
 	for _, dn := range vl.vid2location[vid].list {
-		if v, found := dn.volumes[vid]; found {
+		if v, getError := dn.GetVolumesById(vid); getError == nil {
 			if v.ReadOnly {
 				return false
 			}