mount: cache on reading remote storage

weed/pb/filer_pb/filer_pb_helper.go

@@ -12,6 +12,10 @@ import (
 	"github.com/viant/ptrie"
 )
 
+func (entry *Entry) IsInRemoteOnly() bool {
+	return len(entry.Chunks) == 0 && entry.RemoteEntry != nil && entry.RemoteEntry.RemoteSize > 0
+}
+
 func ToFileIdObject(fileIdStr string) (*FileId, error) {
 	t, err := needle.ParseFileIdFromString(fileIdStr)
 	if err != nil {