core: introduce CGroupIOLimitType enums

Currently, there are two cgroup IO limits, bandwidth max for read and write,
and they are hard-coded in various places.  This is fine for two limits but IO
is expected to grow more limits - low, high and max limits for bandwidth and
IOPS - and hard-coding each limit won't make sense.

This patch replaces hard-coded limits with an array indexed by
CGroupIOLimitType and accompanying string and default value tables so that new
limits can be added trivially.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/core/cgroup.h b/src/core/cgroup.h
index a533923072..1907461f7e 100644
--- a/src/core/cgroup.h
+++ b/src/core/cgroup.h
@@ -23,6 +23,7 @@
 
 #include "list.h"
 #include "time-util.h"
+#include "cgroup-util.h"
 
 typedef struct CGroupContext CGroupContext;
 typedef struct CGroupDeviceAllow CGroupDeviceAllow;
@@ -64,8 +65,7 @@ struct CGroupIODeviceWeight {
 struct CGroupIODeviceLimit {
         LIST_FIELDS(CGroupIODeviceLimit, device_limits);
         char *path;
-        uint64_t rbps_max;
-        uint64_t wbps_max;
+        uint64_t limits[_CGROUP_IO_LIMIT_TYPE_MAX];
 };
 
 struct CGroupBlockIODeviceWeight {