Confine cleanup and use held session locks

internal/fileops/rename_noreplace_windows.go

@@ -2,18 +2,17 @@
 
 package fileops
 
-import "golang.org/x/sys/windows"
+import (
+	"fmt"
+	"os"
+)
 
-func checkAtomicDirectoryPromotionSupport() error { return nil }
-
-func renameDirectoryNoReplace(src, dst string) error {
-	from, err := windows.UTF16PtrFromString(src)
-	if err != nil {
-		return err
-	}
-	to, err := windows.UTF16PtrFromString(dst)
-	if err != nil {
-		return err
-	}
-	return windows.MoveFileEx(from, to, 0)
+func checkAtomicDirectoryPromotionSupport() error {
+	return fmt.Errorf("%w on windows", ErrAtomicDirectoryPromotionUnsupported)
+}
+
+func renameDirectoryNoReplace(src, dst string) error { return checkAtomicDirectoryPromotionSupport() }
+
+func renameDirectoryNoReplaceAt(parent *os.File, src, dst string) error {
+	return checkAtomicDirectoryPromotionSupport()
 }