avoid possible concurrent access inside ensureCorrectWritables()

weed/topology/topology.go

@@ -177,7 +177,9 @@ func (t *Topology) DeleteCollection(collectionName string) {
 }
 
 func (t *Topology) RegisterVolumeLayout(v storage.VolumeInfo, dn *DataNode) {
-	t.GetVolumeLayout(v.Collection, v.ReplicaPlacement, v.Ttl).RegisterVolume(&v, dn)
+	vl := t.GetVolumeLayout(v.Collection, v.ReplicaPlacement, v.Ttl)
+	vl.RegisterVolume(&v, dn)
+	vl.EnsureCorrectWritables(&v)
 }
 func (t *Topology) UnRegisterVolumeLayout(v storage.VolumeInfo, dn *DataNode) {
 	glog.Infof("removing volume info:%+v", v)

weed/topology/volume_layout.go

@@ -141,7 +141,6 @@ func (vl *VolumeLayout) RegisterVolume(v *storage.VolumeInfo, dn *DataNode) {
 	vl.accessLock.Lock()
 	defer vl.accessLock.Unlock()
 
-	defer vl.ensureCorrectWritables(v.Id)
 	defer vl.rememberOversizedVolume(v, dn)
 
 	if _, ok := vl.vid2location[v.Id]; !ok {