fix no more writables volumes while disk free space is sufficient (#4491)

Co-authored-by: wang wusong <wangwusong@virtaitech.com>

weed/topology/topology_vacuum.go

@@ -172,6 +172,21 @@ func (t *Topology) batchVacuumVolumeCommit(grpcDialOption grpc.DialOption, vl *V
 	}
 
 	if isCommitSuccess {
+		//reset all vacuumed volumes size
+		for _, dn := range vacuumLocationList.list {
+			vInfo, err := dn.GetVolumesById(vid)
+			if err != nil {
+				glog.V(0).Infof("get volume info for volume: %d failed %v", vid, err)
+				return false
+			}
+
+			dn.Lock()
+			disk := dn.getOrCreateDisk(vInfo.DiskType)
+			vInfo.Size = 0
+			disk.doAddOrUpdateVolume(vInfo)
+			dn.Unlock()
+		}
+
 		for _, dn := range vacuumLocationList.list {
 			vl.SetVolumeAvailable(dn, vid, isReadOnly)
 		}