copy ec shards to disks already having ec volumes

fix https://github.com/seaweedfs/seaweedfs/issues/5615

weed/server/volume_grpc_copy.go

@@ -63,7 +63,9 @@ func (vs *VolumeServer) VolumeCopy(req *volume_server_pb.VolumeCopyRequest, stre
 		if req.DiskType != "" {
 			diskType = req.DiskType
 		}
-		location := vs.store.FindFreeLocation(types.ToDiskType(diskType))
+		location := vs.store.FindFreeLocation(func(location *storage.DiskLocation) bool {
+			return location.DiskType == types.ToDiskType(diskType)
+		})
 		if location == nil {
 			return fmt.Errorf("no space left for disk type %s", types.ToDiskType(diskType).ReadableString())
 		}

weed/server/volume_grpc_erasure_coding.go

@@ -143,7 +143,10 @@ func (vs *VolumeServer) VolumeEcShardsCopy(ctx context.Context, req *volume_serv
 
 	glog.V(0).Infof("VolumeEcShardsCopy: %v", req)
 
-	location := vs.store.FindFreeLocation(types.HardDriveType)
+	location := vs.store.FindFreeLocation(func(location *storage.DiskLocation) bool {
+		_, found := location.FindEcVolume(needle.VolumeId(req.VolumeId))
+		return found
+	})
 	if location == nil {
 		return nil, fmt.Errorf("no space left")
 	}

weed/storage/store.go

@@ -138,10 +138,10 @@ func (s *Store) findVolume(vid needle.VolumeId) *Volume {
 	}
 	return nil
 }
-func (s *Store) FindFreeLocation(diskType DiskType) (ret *DiskLocation) {
+func (s *Store) FindFreeLocation(filterFn func(location *DiskLocation) bool) (ret *DiskLocation) {
 	max := int32(0)
 	for _, location := range s.Locations {
-		if diskType != location.DiskType {
+		if filterFn != nil && !filterFn(location) {
 			continue
 		}
 		if location.isDiskSpaceLow {
@@ -162,7 +162,9 @@ func (s *Store) addVolume(vid needle.VolumeId, collection string, needleMapKind
 	if s.findVolume(vid) != nil {
 		return fmt.Errorf("Volume Id %d already exists!", vid)
 	}
-	if location := s.FindFreeLocation(diskType); location != nil {
+	if location := s.FindFreeLocation(func(location *DiskLocation) bool {
+		return location.DiskType == diskType
+	}); location != nil {
 		glog.V(0).Infof("In dir %s adds volume:%v collection:%s replicaPlacement:%v ttl:%v",
 			location.Directory, vid, collection, replicaPlacement, ttl)
 		if volume, err := NewVolume(location.Directory, location.IdxDirectory, collection, vid, needleMapKind, replicaPlacement, ttl, preallocate, memoryMapMaxSizeMb, ldbTimeout); err == nil {