diff --git a/weed/pb/filer_pb/filer_client_bfs.go b/weed/pb/filer_pb/filer_client_bfs.go
new file mode 100644
index 000000000..7c9a8ae28
--- /dev/null
+++ b/weed/pb/filer_pb/filer_client_bfs.go
@@ -0,0 +1,62 @@
+package filer_pb
+
+import (
+	"fmt"
+	"sync"
+	"time"
+
+	"github.com/chrislusf/seaweedfs/weed/util"
+)
+
+func TraverseBfs(filerClient FilerClient, parentPath util.FullPath, fn func(parentPath util.FullPath, entry *Entry)) (err error) {
+
+	K := 5
+
+	var jobQueueWg sync.WaitGroup
+	queue := util.NewQueue()
+	jobQueueWg.Add(1)
+	queue.Enqueue(parentPath)
+	var isTerminating bool
+
+	for i := 0; i < K; i++ {
+		go func() {
+			for {
+				if isTerminating {
+					break
+				}
+				t := queue.Dequeue()
+				if t == nil {
+					time.Sleep(329 * time.Millisecond)
+					continue
+				}
+				dir := t.(util.FullPath)
+				processErr := processOneDirectory(filerClient, dir, queue, &jobQueueWg, fn)
+				if processErr != nil {
+					err = processErr
+				}
+				jobQueueWg.Done()
+			}
+		}()
+	}
+	jobQueueWg.Wait()
+	isTerminating = true
+	return
+}
+
+func processOneDirectory(filerClient FilerClient, parentPath util.FullPath, queue *util.Queue, jobQueueWg *sync.WaitGroup, fn func(parentPath util.FullPath, entry *Entry)) (err error) {
+
+	return ReadDirAllEntries(filerClient, parentPath, "", func(entry *Entry, isLast bool) {
+
+		fn(parentPath, entry)
+
+		if entry.IsDirectory {
+			subDir := fmt.Sprintf("%s/%s", parentPath, entry.Name)
+			if parentPath == "/" {
+				subDir = "/" + entry.Name
+			}
+			jobQueueWg.Add(1)
+			queue.Enqueue(util.FullPath(subDir))
+		}
+	})
+
+}
diff --git a/weed/shell/command_fs_meta_notify.go b/weed/shell/command_fs_meta_notify.go
index 56e63e98f..4342fa81d 100644
--- a/weed/shell/command_fs_meta_notify.go
+++ b/weed/shell/command_fs_meta_notify.go
@@ -43,7 +43,7 @@ func (c *commandFsMetaNotify) Do(args []string, commandEnv *CommandEnv, writer i
 
 	var dirCount, fileCount uint64
 
-	err = doTraverseBfs(writer, commandEnv, util.FullPath(path), func(parentPath util.FullPath, entry *filer_pb.Entry) {
+	err = filer_pb.TraverseBfs(commandEnv, util.FullPath(path), func(parentPath util.FullPath, entry *filer_pb.Entry) {
 
 		if entry.IsDirectory {
 			dirCount++
diff --git a/weed/shell/command_fs_meta_save.go b/weed/shell/command_fs_meta_save.go
index 525cdd128..a5efb69ba 100644
--- a/weed/shell/command_fs_meta_save.go
+++ b/weed/shell/command_fs_meta_save.go
@@ -96,7 +96,7 @@ func (c *commandFsMetaSave) Do(args []string, commandEnv *CommandEnv, writer io.
 
 }
 
-func doTraverseBfsAndSaving(commandEnv *CommandEnv, writer io.Writer, path string, verbose bool, saveFn func(outputChan chan interface{}), genFn func(entry *filer_pb.FullEntry, outputChan chan interface{}) error) error {
+func doTraverseBfsAndSaving(filerClient filer_pb.FilerClient, writer io.Writer, path string, verbose bool, saveFn func(outputChan chan interface{}), genFn func(entry *filer_pb.FullEntry, outputChan chan interface{}) error) error {
 
 	var wg sync.WaitGroup
 	wg.Add(1)
@@ -108,7 +108,7 @@ func doTraverseBfsAndSaving(commandEnv *CommandEnv, writer io.Writer, path strin
 
 	var dirCount, fileCount uint64
 
-	err := doTraverseBfs(writer, commandEnv, util.FullPath(path), func(parentPath util.FullPath, entry *filer_pb.Entry) {
+	err := filer_pb.TraverseBfs(filerClient, util.FullPath(path), func(parentPath util.FullPath, entry *filer_pb.Entry) {
 
 		protoMessage := &filer_pb.FullEntry{
 			Dir:   string(parentPath),
@@ -140,57 +140,4 @@ func doTraverseBfsAndSaving(commandEnv *CommandEnv, writer io.Writer, path strin
 		fmt.Fprintf(writer, "total %d directories, %d files\n", dirCount, fileCount)
 	}
 	return err
-}
-
-func doTraverseBfs(writer io.Writer, filerClient filer_pb.FilerClient, parentPath util.FullPath, fn func(parentPath util.FullPath, entry *filer_pb.Entry)) (err error) {
-
-	K := 5
-
-	var jobQueueWg sync.WaitGroup
-	queue := util.NewQueue()
-	jobQueueWg.Add(1)
-	queue.Enqueue(parentPath)
-	var isTerminating bool
-
-	for i := 0; i < K; i++ {
-		go func() {
-			for {
-				if isTerminating {
-					break
-				}
-				t := queue.Dequeue()
-				if t == nil {
-					time.Sleep(329 * time.Millisecond)
-					continue
-				}
-				dir := t.(util.FullPath)
-				processErr := processOneDirectory(writer, filerClient, dir, queue, &jobQueueWg, fn)
-				if processErr != nil {
-					err = processErr
-				}
-				jobQueueWg.Done()
-			}
-		}()
-	}
-	jobQueueWg.Wait()
-	isTerminating = true
-	return
-}
-
-func processOneDirectory(writer io.Writer, filerClient filer_pb.FilerClient, parentPath util.FullPath, queue *util.Queue, jobQueueWg *sync.WaitGroup, fn func(parentPath util.FullPath, entry *filer_pb.Entry)) (err error) {
-
-	return filer_pb.ReadDirAllEntries(filerClient, parentPath, "", func(entry *filer_pb.Entry, isLast bool) {
-
-		fn(parentPath, entry)
-
-		if entry.IsDirectory {
-			subDir := fmt.Sprintf("%s/%s", parentPath, entry.Name)
-			if parentPath == "/" {
-				subDir = "/" + entry.Name
-			}
-			jobQueueWg.Add(1)
-			queue.Enqueue(util.FullPath(subDir))
-		}
-	})
-
-}
+}
\ No newline at end of file