use existing attributes instead of fetching from filer

weed/filesys/file.go

@@ -28,6 +28,8 @@ type File struct {
 func (file *File) Attr(context context.Context, attr *fuse.Attr) error {
 
 	fullPath := filepath.Join(file.dir.Path, file.Name)
+
+	if file.attributes == nil {
 		item := file.wfs.listDirectoryEntriesCache.Get(fullPath)
 		if item != nil {
 			entry := item.Value().(*filer_pb.Entry)
@@ -60,6 +62,7 @@ func (file *File) Attr(context context.Context, attr *fuse.Attr) error {
 				return err
 			}
 		}
+	}
 
 	attr.Mode = os.FileMode(file.attributes.FileMode)
 	attr.Size = filer2.TotalSize(file.Chunks)