diff --git a/mercurial/filelog.py b/mercurial/filelog.py
--- a/mercurial/filelog.py
+++ b/mercurial/filelog.py
@@ -107,8 +107,8 @@ class filelog:
     def iscensored(self, rev):
         return self._revlog.iscensored(rev)
 
-    def revision(self, node, _df=None):
-        return self._revlog.revision(node, _df=_df)
+    def revision(self, node):
+        return self._revlog.revision(node)
 
     def rawdata(self, node, _df=None):
         return self._revlog.rawdata(node, _df=_df)
diff --git a/mercurial/interfaces/repository.py b/mercurial/interfaces/repository.py
--- a/mercurial/interfaces/repository.py
+++ b/mercurial/interfaces/repository.py
@@ -1282,7 +1282,7 @@ class imanifeststorage(interfaceutil.Int
     def linkrev(rev):
         """Obtain the changeset revision number a revision is linked to."""
 
-    def revision(node, _df=None):
+    def revision(node):
         """Obtain fulltext data for a node."""
 
     def rawdata(node, _df=None):
diff --git a/mercurial/manifest.py b/mercurial/manifest.py
--- a/mercurial/manifest.py
+++ b/mercurial/manifest.py
@@ -1821,8 +1821,8 @@ class manifestrevlog:
     def checksize(self):
         return self._revlog.checksize()
 
-    def revision(self, node, _df=None):
-        return self._revlog.revision(node, _df=_df)
+    def revision(self, node):
+        return self._revlog.revision(node)
 
     def rawdata(self, node, _df=None):
         return self._revlog.rawdata(node, _df=_df)
diff --git a/mercurial/revlog.py b/mercurial/revlog.py
--- a/mercurial/revlog.py
+++ b/mercurial/revlog.py
@@ -1954,13 +1954,11 @@ class revlog:
 
         return mdiff.textdiff(self.rawdata(rev1), self.rawdata(rev2))
 
-    def revision(self, nodeorrev, _df=None):
+    def revision(self, nodeorrev):
         """return an uncompressed revision of a given node or revision
         number.
-
-        _df - an existing file handle to read from. (internal-only)
         """
-        return self._revisiondata(nodeorrev, _df)
+        return self._revisiondata(nodeorrev)
 
     def sidedata(self, nodeorrev, _df=None):
         """a map of extra data related to the changeset but not part of the hash