[PATCH] mountstats: add per-op error counts for mountstats command

[Dave Wysochanski <dwysocha@redhat.com>]

Display the count of ops completing with error status (status < 0)
on kernels that support it.

Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
---
 tools/mountstats/mountstats.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/mountstats/mountstats.py b/tools/mountstats/mountstats.py
index c7fb8bb1..b8c720d5 100755
--- a/tools/mountstats/mountstats.py
+++ b/tools/mountstats/mountstats.py
@@ -475,7 +475,9 @@ class DeviceData:
                 retrans = stats[2] - count
                 if retrans != 0:
                     print('\t%d retrans (%d%%)' % (retrans, ((retrans * 100) / count)), end=' ')
-                    print('\t%d major timeouts' % stats[3])
+                    print('\t%d major timeouts' % stats[3], end='')
+                if len(stats) >= 10 and stats[9] != 0:
+                    print('%d errors (%d%%)' % (stats[9], ((stats[9] * 100) / count)))
                 else:
                     print('')
                 print('\tavg bytes sent per op: %d\tavg bytes received per op: %d' % \
-- 
2.20.1