file store adds memdb implementation

weed/filer2/permission.go

@@ -0,0 +1,22 @@
+package filer2
+
+func hasWritePermission(dir *Entry, entry *Entry) bool {
+
+	if dir == nil {
+		return false
+	}
+
+	if dir.Uid == entry.Uid && dir.Mode&0200 > 0 {
+		return true
+	}
+
+	if dir.Gid == entry.Gid && dir.Mode&0020 > 0 {
+		return true
+	}
+
+	if dir.Mode&0002 > 0 {
+		return true
+	}
+
+	return false
+}