throttle: Don't allow burst limits to be lower than the normal limits

Setting FOO_max to a value that is lower than FOO does not make
sense, and it produces odd results depending on the value of
FOO_max_length. Although the user should not set that configuration
in the first place it's better to reject it explicitly.

https://bugzilla.redhat.com/show_bug.cgi?id=1355665

Signed-off-by: Alberto Garcia <berto@igalia.com>
Reported-by: Gu Nini <ngu@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 663d5aca406060e31f80d8113f77b6feee63b919.1469693110.git.berto@igalia.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

diff --git a/util/throttle.c b/util/throttle.c
index 654f95caf25866df927e7d5f07cefa4c60ae81ff..3817d9b9046eb6ab89e6438d5c980b77edb8ada7 100644 (file)
--- a/util/throttle.c
+++ b/util/throttle.c
@@ -348,6 +348,11 @@ bool throttle_is_valid(ThrottleConfig *cfg, Error **errp)
                        " bps/iops values");
             return false;
         }
+
+        if (cfg->buckets[i].max && cfg->buckets[i].max < cfg->buckets[i].avg) {
+            error_setg(errp, "bps_max/iops_max cannot be lower than bps/iops");
+            return false;
+        }
     }
 
     return true;