add locking to volume layout vacuum

weed/topology/topology_event_handling.go

@@ -40,6 +40,10 @@ func (t *Topology) SetVolumeCapacityFull(volumeInfo storage.VolumeInfo) bool {
 	if !vl.SetVolumeCapacityFull(volumeInfo.Id) {
 		return false
 	}
+
+	vl.accessLock.RLock()
+	defer vl.accessLock.RUnlock()
+
 	for _, dn := range vl.vid2location[volumeInfo.Id].list {
 		if !volumeInfo.ReadOnly {
 			dn.UpAdjustActiveVolumeCountDelta(-1)

weed/topology/topology_vacuum.go

@@ -122,7 +122,23 @@ func (t *Topology) Vacuum(garbageThreshold float64, preallocate int64) int {
 		for _, vl := range c.storageType2VolumeLayout.Items() {
 			if vl != nil {
 				volumeLayout := vl.(*VolumeLayout)
+				vacuumOneVolumeLayout(volumeLayout, c, garbageThreshold, preallocate)
+			}
+		}
+	}
+	return 0
+}
+
+func vacuumOneVolumeLayout(volumeLayout *VolumeLayout, c *Collection, garbageThreshold float64, preallocate int64) {
+
+	volumeLayout.accessLock.RLock()
+	tmpMap := make(map[storage.VolumeId]*VolumeLocationList)
 	for vid, locationlist := range volumeLayout.vid2location {
+		tmpMap[vid] = locationlist
+	}
+	volumeLayout.accessLock.RUnlock()
+
+	for vid, locationlist := range tmpMap {
 
 		volumeLayout.accessLock.RLock()
 		isReadOnly, hasValue := volumeLayout.readonlyVolumes[vid]
@@ -139,10 +155,6 @@ func (t *Topology) Vacuum(garbageThreshold float64, preallocate int64) int {
 			}
 		}
 	}
-			}
-		}
-	}
-	return 0
 }
 
 type VacuumVolumeResult struct {