Log serial when IXFR version not in journal

It may be useful to know which version (begin serial) is missing when
the IXFR version cannot be found.

diff --git a/lib/ns/xfrout.c b/lib/ns/xfrout.c
index 097971fc505aaad12515602d73e7b932eaa845e9..66cc502dc5f430037bdf48e21a925a1a7fed0757 100644 (file)
--- a/lib/ns/xfrout.c
+++ b/lib/ns/xfrout.c
@@ -1008,7 +1008,8 @@ got_soa:
                        xfrout_log1(client, question_name, question_class,
                                    ISC_LOG_INFO,
                                    "IXFR version not in journal, "
-                                   "falling back to AXFR");
+                                   "falling back to AXFR (serial %u)",
+                                   begin_serial);
                        mnemonic = "AXFR-style IXFR";
                        goto axfr_fallback;
                }