diff -r 35ea3c139104 -r 1891086f6c7f rust/hg-cpython/src/dirstate/dirstate_map.rs
--- a/rust/hg-cpython/src/dirstate/dirstate_map.rs	Fri Feb 24 01:15:45 2023 +0100
+++ b/rust/hg-cpython/src/dirstate/dirstate_map.rs	Fri Feb 24 18:21:54 2023 +0100
@@ -23,7 +23,8 @@
     pybytes_deref::PyBytesDeref,
 };
 use hg::{
-    dirstate::StateMapIter, dirstate_tree::on_disk::DirstateV2ParseError,
+    dirstate::StateMapIter, dirstate_tree::dirstate_map::DirstateMapWriteMode,
+    dirstate_tree::on_disk::DirstateV2ParseError,
     dirstate_tree::owning::OwningDirstateMap, revlog::Node,
     utils::files::normalize_case, utils::hg_path::HgPath, DirstateEntry,
     DirstateError, DirstateParents,
@@ -247,10 +248,15 @@
     /// instead of written to a new data file (False).
     def write_v2(
         &self,
-        can_append: bool,
+        write_mode: usize,
     ) -> PyResult<PyObject> {
         let inner = self.inner(py).borrow();
-        let result = inner.pack_v2(can_append);
+        let rust_write_mode = match write_mode {
+            0 => DirstateMapWriteMode::Auto,
+            1 => DirstateMapWriteMode::ForceNewDataFile,
+            _ => DirstateMapWriteMode::Auto, // XXX should we error out?
+        };
+        let result = inner.pack_v2(rust_write_mode);
         match result {
             Ok((packed, tree_metadata, append, _old_data_size)) => {
                 let packed = PyBytes::new(py, &packed);