diff --git a/weed/util/bptree/bpmap.go b/weed/util/bptree/bpmap.go
index 9b391fd88..a68eae255 100644
--- a/weed/util/bptree/bpmap.go
+++ b/weed/util/bptree/bpmap.go
@@ -9,13 +9,6 @@ import (
  */
 type BpMap BpTree
 
-func (self *BpMap) getRoot() *BpNode {
-	return self.root
-}
-func (self *BpMap) setRoot(root *BpNode) {
-	self.root = root
-}
-
 func NewBpMap(node_size int) *BpMap {
 	return &BpMap{
 		root: NewLeaf(node_size),
diff --git a/weed/util/bptree/bptree.go b/weed/util/bptree/bptree.go
index 68ee08720..405e93ac7 100644
--- a/weed/util/bptree/bptree.go
+++ b/weed/util/bptree/bptree.go
@@ -10,13 +10,6 @@ type BpTree struct {
 	root *BpNode
 }
 
-func (self *BpTree) getRoot() *BpNode {
-	return self.root
-}
-func (self *BpTree) setRoot(root *BpNode) {
-	self.root = root
-}
-
 type loc_iterator func() (i int, leaf *BpNode, li loc_iterator)
 
 func NewBpTree(node_size int) *BpTree {
diff --git a/weed/util/bptree/getter_setter.go b/weed/util/bptree/getter_setter.go
new file mode 100644
index 000000000..cd5c8344b
--- /dev/null
+++ b/weed/util/bptree/getter_setter.go
@@ -0,0 +1,15 @@
+package bptree
+
+func (self *BpMap) getRoot() *BpNode {
+	return self.root
+}
+func (self *BpMap) setRoot(root *BpNode) {
+	self.root = root
+}
+
+func (self *BpTree) getRoot() *BpNode {
+	return self.root
+}
+func (self *BpTree) setRoot(root *BpNode) {
+	self.root = root
+}