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wcfs/wcfs.go

@@ -1134,7 +1134,10 @@ func (head *Head) bigopen(ctx context.Context, oid zodb.Oid) (_ *BigFile, err er
 	}
 	blksize := zbf.blksize
 	// XXX it should be revision of both ZBigFile and its data. But we
-	// cannot get data revision without expensive scan of all objects under ZBigFile.
+	// cannot get data revision without expensive scan of all ZBigFile's objects.
+	// -> approximate mtime initially with ZBigFile object mtime.
+	//
+	// XXX for @rev/... we can know initial mtime more exactly?
 	rev     := zbf.PSerial()
 	zbf.PDeactivate()