1 files changed, 15 insertions, 0 deletions
diff --git a/weed/storage/backend/backend.go b/weed/storage/backend/backend.go
new file mode 100644
index 000000000..ae0f84216
--- /dev/null
+++ b/weed/storage/backend/backend.go
@@ -0,0 +1,15 @@
+package backend
+
+import (
+	"io"
+	"time"
+)
+
+type DataStorageBackend interface {
+	io.ReaderAt
+	io.WriterAt
+	Truncate(off int64) error
+	io.Closer
+	GetStat() (datSize int64, modTime time.Time, err error)
+	String() string
+}