+/* Present on all sender dirs when --copy-unsafe-links is enabled.
+ * See explanation at make_file. */
+#define F_DIR_PHYS_DEPTH(f) OPT_EXTRA(f, START_BUMP(f))->unum
+
+/* "phys_depth" arg to pass to make_file when not applicable
+ * (e.g., receiving side) */
+#define PHYS_DEPTH_N_A 0
+