core: update CGroupBlockIODeviceBandwidth to record both rbps and wbps

CGroupBlockIODeviceBandwith is used to keep track of IO bandwidth limits for
legacy cgroup hierarchies.  Unlike the unified hierarchy counterpart
CGroupIODeviceLimit, a CGroupBlockIODeviceBandwiddth records either a read or
write limit and has a couple issues.

* There's no way to clear specific config entry.

* When configs are cleared for an IO direction of a unit, the kernel settings
  aren't cleared accordingly creating discrepancies.

This patch updates CGroupBlockIODeviceBandwidth so that it behaves similarly to
CGroupIODeviceLimit - each entry records both rbps and wbps limits and is
cleared if both are at default values after kernel settings are updated.

diff --git a/src/core/cgroup.h b/src/core/cgroup.h
index 2a5a223eb677212fadf3fa1b5c553b5d686519a4..4d9b52e1d1cbd1e296b3390ff693b7005620234c 100644 (file)
--- a/src/core/cgroup.h
+++ b/src/core/cgroup.h
@@ -64,8 +64,8 @@ struct CGroupBlockIODeviceWeight {
 struct CGroupBlockIODeviceBandwidth {
         LIST_FIELDS(CGroupBlockIODeviceBandwidth, device_bandwidths);
         char *path;
-        uint64_t bandwidth;
-        bool read;
+        uint64_t rbps;
+        uint64_t wbps;
 };
 
 struct CGroupContext {