diff --git a/userspace/marsadm b/userspace/marsadm
index a5468c0d..b99e4bee 100755
--- a/userspace/marsadm
+++ b/userspace/marsadm
@@ -4489,6 +4489,13 @@ sub eval_fn {
       my $what = $1;
       return eval_fn($env, "$what-lognr", "") - eval_fn($env, "replay-lognr", "");
     }
+    if (/^writeback[-_]?rest$/) {
+      my $lnk = $$env{"resdir"} . "/replay-" . $$env{"host"};
+      my $link = get_link($lnk, 1);
+      $link =~ m/,([0-9]+)$/;
+      return $1 if defined($1);
+      return 0;
+    }
     if (/^(replay|work)[-_]?(pos)$/) {
       my $what = $1;
       my $op   = $2;
@@ -5400,6 +5407,8 @@ my %trivial_globs =
    => "",
    "{sync,fetch,replay,work}-{rest,{almost-,threshold-,}reached,percent,permille,vector}"
    => "",
+   "writeback-rest"
+   => "",
    "{sync,fetch,replay}-{rate,remain}"
    => "",
    "replay-basenr"