mercurial/dirstatemap.py

--- a/mercurial/dirstatemap.py	Thu Jul 08 12:18:21 2021 +0200
+++ b/mercurial/dirstatemap.py	Mon Jul 12 22:46:52 2021 +0200
@@ -637,7 +637,9 @@
                     data = self._opener.read(self.docket.data_filename())
                 else:
                     data = b''
-                self._rustmap = rustmod.DirstateMap.new_v2(data)
+                self._rustmap = rustmod.DirstateMap.new_v2(
+                    data, self.docket.data_size
+                )
                 parents = self.docket.parents
             else:
                 self._rustmap, parents = rustmod.DirstateMap.new_v1(