add volume number param in assign operation

weed/operation/assign_file_id.go

@@ -11,13 +11,14 @@ import (
 )
 
 type VolumeAssignRequest struct {
-	Count       uint64
-	Replication string
-	Collection  string
-	Ttl         string
-	DataCenter  string
-	Rack        string
-	DataNode    string
+	Count               uint64
+	Replication         string
+	Collection          string
+	Ttl                 string
+	DataCenter          string
+	Rack                string
+	DataNode            string
+	WritableVolumeCount uint32
 }
 
 type AssignResult struct {
@@ -53,6 +54,7 @@ func Assign(server string, grpcDialOption grpc.DialOption, primaryRequest *Volum
 				DataCenter:  primaryRequest.DataCenter,
 				Rack:        primaryRequest.Rack,
 				DataNode:    primaryRequest.DataNode,
+				WritableVolumeCount: primaryRequest.WritableVolumeCount,
 			}
 			resp, grpcErr := masterClient.Assign(context.Background(), req)
 			if grpcErr != nil {