diff --git a/weed/pb/master.proto b/weed/pb/master.proto
index ff47a16d4..2c4dc4a92 100644
--- a/weed/pb/master.proto
+++ b/weed/pb/master.proto
@@ -165,6 +165,8 @@ message DataNodeInfo {
     uint64 free_volume_count = 4;
     uint64 active_volume_count = 5;
     repeated VolumeInformationMessage volume_infos = 6;
+    string url = 7;
+    string public_url = 8;
 }
 message RackInfo {
     string id = 1;
@@ -189,6 +191,7 @@ message TopologyInfo {
     uint64 free_volume_count = 4;
     uint64 active_volume_count = 5;
     repeated DataCenterInfo data_center_infos = 6;
+    uint64 volume_size_limit_bytes = 7;
 }
 message VolumeListRequest {
 }
diff --git a/weed/pb/master_pb/master.pb.go b/weed/pb/master_pb/master.pb.go
index a586d11b3..4ab414124 100644
--- a/weed/pb/master_pb/master.pb.go
+++ b/weed/pb/master_pb/master.pb.go
@@ -38,13 +38,13 @@ It has these top-level messages:
 */
 package master_pb
 
-import proto "github.com/golang/protobuf/proto"
-import fmt "fmt"
-import math "math"
+import "github.com/golang/protobuf/proto"
+import "fmt"
+import "math"
 
 import (
-	context "golang.org/x/net/context"
-	grpc "google.golang.org/grpc"
+	"golang.org/x/net/context"
+	"google.golang.org/grpc"
 )
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -793,6 +793,8 @@ type DataNodeInfo struct {
 	FreeVolumeCount   uint64                      `protobuf:"varint,4,opt,name=free_volume_count,json=freeVolumeCount" json:"free_volume_count,omitempty"`
 	ActiveVolumeCount uint64                      `protobuf:"varint,5,opt,name=active_volume_count,json=activeVolumeCount" json:"active_volume_count,omitempty"`
 	VolumeInfos       []*VolumeInformationMessage `protobuf:"bytes,6,rep,name=volume_infos,json=volumeInfos" json:"volume_infos,omitempty"`
+	Url               string                      `protobuf:"bytes,7,opt,name=url" json:"url,omitempty"`
+	PublicUrl         string                      `protobuf:"bytes,8,opt,name=public_url,json=publicUrl" json:"public_url,omitempty"`
 }
 
 func (m *DataNodeInfo) Reset()                    { *m = DataNodeInfo{} }
@@ -842,6 +844,20 @@ func (m *DataNodeInfo) GetVolumeInfos() []*VolumeInformationMessage {
 	return nil
 }
 
+func (m *DataNodeInfo) GetUrl() string {
+	if m != nil {
+		return m.Url
+	}
+	return ""
+}
+
+func (m *DataNodeInfo) GetPublicUrl() string {
+	if m != nil {
+		return m.PublicUrl
+	}
+	return ""
+}
+
 type RackInfo struct {
 	Id                string          `protobuf:"bytes,1,opt,name=id" json:"id,omitempty"`
 	VolumeCount       uint64          `protobuf:"varint,2,opt,name=volume_count,json=volumeCount" json:"volume_count,omitempty"`
@@ -955,12 +971,13 @@ func (m *DataCenterInfo) GetRackInfos() []*RackInfo {
 }
 
 type TopologyInfo struct {
-	Id                string            `protobuf:"bytes,1,opt,name=id" json:"id,omitempty"`
-	VolumeCount       uint64            `protobuf:"varint,2,opt,name=volume_count,json=volumeCount" json:"volume_count,omitempty"`
-	MaxVolumeCount    uint64            `protobuf:"varint,3,opt,name=max_volume_count,json=maxVolumeCount" json:"max_volume_count,omitempty"`
-	FreeVolumeCount   uint64            `protobuf:"varint,4,opt,name=free_volume_count,json=freeVolumeCount" json:"free_volume_count,omitempty"`
-	ActiveVolumeCount uint64            `protobuf:"varint,5,opt,name=active_volume_count,json=activeVolumeCount" json:"active_volume_count,omitempty"`
-	DataCenterInfos   []*DataCenterInfo `protobuf:"bytes,6,rep,name=data_center_infos,json=dataCenterInfos" json:"data_center_infos,omitempty"`
+	Id                   string            `protobuf:"bytes,1,opt,name=id" json:"id,omitempty"`
+	VolumeCount          uint64            `protobuf:"varint,2,opt,name=volume_count,json=volumeCount" json:"volume_count,omitempty"`
+	MaxVolumeCount       uint64            `protobuf:"varint,3,opt,name=max_volume_count,json=maxVolumeCount" json:"max_volume_count,omitempty"`
+	FreeVolumeCount      uint64            `protobuf:"varint,4,opt,name=free_volume_count,json=freeVolumeCount" json:"free_volume_count,omitempty"`
+	ActiveVolumeCount    uint64            `protobuf:"varint,5,opt,name=active_volume_count,json=activeVolumeCount" json:"active_volume_count,omitempty"`
+	DataCenterInfos      []*DataCenterInfo `protobuf:"bytes,6,rep,name=data_center_infos,json=dataCenterInfos" json:"data_center_infos,omitempty"`
+	VolumeSizeLimitBytes uint64            `protobuf:"varint,7,opt,name=volume_size_limit_bytes,json=volumeSizeLimitBytes" json:"volume_size_limit_bytes,omitempty"`
 }
 
 func (m *TopologyInfo) Reset()                    { *m = TopologyInfo{} }
@@ -1010,6 +1027,13 @@ func (m *TopologyInfo) GetDataCenterInfos() []*DataCenterInfo {
 	return nil
 }
 
+func (m *TopologyInfo) GetVolumeSizeLimitBytes() uint64 {
+	if m != nil {
+		return m.VolumeSizeLimitBytes
+	}
+	return 0
+}
+
 type VolumeListRequest struct {
 }
 
diff --git a/weed/server/volume_grpc_copy.go b/weed/server/volume_grpc_copy.go
index dbcdb1052..03ab04a62 100644
--- a/weed/server/volume_grpc_copy.go
+++ b/weed/server/volume_grpc_copy.go
@@ -92,7 +92,7 @@ func (vs *VolumeServer) VolumeCopy(ctx context.Context, req *volume_server_pb.Vo
 		return nil, err
 	}
 
-	if err = checkCopyFiles(volFileInfoResp, idxFileName, datFileName); err != nil { // added by panyc16
+	if err = checkCopyFiles(volFileInfoResp, idxFileName, datFileName); err != nil {
 		return nil, err
 	}