4 files changed, 4 insertions, 13 deletions
diff --git a/weed/storage/backend/backend.go b/weed/storage/backend/backend.go
index 05a7fe84f..2f878110d 100644
--- a/weed/storage/backend/backend.go
+++ b/weed/storage/backend/backend.go
@@ -18,7 +18,7 @@ type BackendStorageFile interface {
 	Truncate(off int64) error
 	io.Closer
 	GetStat() (datSize int64, modTime time.Time, err error)
-	String() string
+	Name() string
 }
 
 type BackendStorage interface {
diff --git a/weed/storage/backend/disk_file.go b/weed/storage/backend/disk_file.go
index 4929f0573..c4b3caffb 100644
--- a/weed/storage/backend/disk_file.go
+++ b/weed/storage/backend/disk_file.go
@@ -45,10 +45,6 @@ func (df *DiskFile) GetStat() (datSize int64, modTime time.Time, err error) {
 	return 0, time.Time{}, err
 }
 
-func (df *DiskFile) String() string {
+func (df *DiskFile) Name() string {
 	return df.fullFilePath
 }
-
-func (df *DiskFile) Instantiate(src *os.File) error {
-	panic("should not implement Instantiate for DiskFile")
-}
diff --git a/weed/storage/backend/memory_map/memory_map_backend.go b/weed/storage/backend/memory_map/memory_map_backend.go
index f1d723c3b..03e7308d0 100644
--- a/weed/storage/backend/memory_map/memory_map_backend.go
+++ b/weed/storage/backend/memory_map/memory_map_backend.go
@@ -55,10 +55,6 @@ func (mmf *MemoryMappedFile) GetStat() (datSize int64, modTime time.Time, err er
 	return 0, time.Time{}, err
 }
 
-func (mmf *MemoryMappedFile) String() string {
+func (mmf *MemoryMappedFile) Name() string {
 	return mmf.mm.File.Name()
 }
-
-func (mmf *MemoryMappedFile) Instantiate(src *os.File) error {
-	panic("should not implement Instantiate for MemoryMappedFile")
-}
diff --git a/weed/storage/backend/s3_backend/s3_backend.go b/weed/storage/backend/s3_backend/s3_backend.go
index 458a9ca72..665f0b9b9 100644
--- a/weed/storage/backend/s3_backend/s3_backend.go
+++ b/weed/storage/backend/s3_backend/s3_backend.go
@@ -153,7 +153,6 @@ func (s3backendStorageFile S3BackendStorageFile) GetStat() (datSize int64, modTi
 	return
 }
 
-func (s3backendStorageFile S3BackendStorageFile) String() string {
+func (s3backendStorageFile S3BackendStorageFile) Name() string {
 	return s3backendStorageFile.key
 }
-