Add new counters for flush requests in Linux 5.5 (#1548)

* Add diskstat flush request counters for Linux 5.5+
* Update tests for diskstat flush request counters with Linux 5.5+

Signed-off-by: Holger Hoffstätte <holger@applied-asynchrony.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/collector/diskstats_linux_test.go b/collector/diskstats_linux_test.go
index 84a7de4..9bfecc5 100644
--- a/collector/diskstats_linux_test.go
+++ b/collector/diskstats_linux_test.go
@@ -41,4 +41,12 @@ func TestDiskStats(t *testing.T) {
         if want, got := "11130", diskStats["sdb"][14]; want != got {
                 t.Errorf("want diskstats sdb %s, got %s", want, got)
         }
+
+        if want, got := "1555", diskStats["sdc"][15]; want != got {
+                t.Errorf("want diskstats sdc %s, got %s", want, got)
+        }
+
+        if want, got := "1944", diskStats["sdc"][16]; want != got {
+                t.Errorf("want diskstats sdc %s, got %s", want, got)
+        }
 }