Fix build error with NIOSTATS_CONTEXT (#10506)

Summary:
Fix https://github.com/facebook/rocksdb/issues/10475

Pull Request resolved: https://github.com/facebook/rocksdb/pull/10506

Reviewed By: hx235

Differential Revision: D38549337

Pulled By: ajkr

fbshipit-source-id: fba864fba1b584c41419ca6015d5d62051539812

logging/env_logger.h

@@ -57,12 +57,12 @@ class EnvLogger : public Logger {
       // Preserve iostats not to pollute writes from user writes. We might
       // need a better solution than this.
       SetPerfLevel(PerfLevel::kDisable);
-      iostats_context.disable_iostats = true;
+      IOSTATS_SET_DISABLE(true);
       logger.mutex_.Lock();
     }
     ~FileOpGuard() {
       logger_.mutex_.Unlock();
-      iostats_context.disable_iostats = false;
+      IOSTATS_SET_DISABLE(false);
       SetPerfLevel(prev_perf_level_);
     }
 

monitoring/iostats_context_imp.h

@@ -43,6 +43,8 @@ extern thread_local IOStatsContext iostats_context;
       PerfLevel::kEnableTimeAndCPUTimeExceptForMutex); \
   iostats_step_timer_##metric.Start();
 
+#define IOSTATS_SET_DISABLE(disable) (iostats_context.disable_iostats = disable)
+
 #else  // !NIOSTATS_CONTEXT
 
 #define IOSTATS_ADD(metric, value)
@@ -52,6 +54,7 @@ extern thread_local IOStatsContext iostats_context;
 #define IOSTATS_SET_THREAD_POOL_ID(value)
 #define IOSTATS_THREAD_POOL_ID()
 #define IOSTATS(metric) 0
+#define IOSTATS_SET_DISABLE(disable)
 
 #define IOSTATS_TIMER_GUARD(metric)
 #define IOSTATS_CPU_TIMER_GUARD(metric, clock) static_cast<void>(clock)