Report flash disk usage

Former-commit-id: 8e4a71ccd31e3c643a6f7b5154d8f2a65d2de76f

src/IStorage.h

@@ -9,6 +9,7 @@ public:
     virtual ~IStorageFactory() {}
     virtual class IStorage *create(int db, key_load_iterator itr) = 0;
     virtual const char *name() const = 0;
+    virtual size_t totalDiskspaceUsed() const = 0;
 };
 
 class IStorage

src/Makefile

@@ -376,6 +376,7 @@ DEP = $(REDIS_SERVER_OBJ:%.o=%.d) $(REDIS_CLI_OBJ:%.o=%.d) $(REDIS_BENCHMARK_OBJ
 clean:
 	rm -rf $(REDIS_SERVER_NAME) $(REDIS_SENTINEL_NAME) $(REDIS_CLI_NAME) $(REDIS_BENCHMARK_NAME) $(REDIS_CHECK_RDB_NAME) $(REDIS_CHECK_AOF_NAME) *.o *.gcda *.gcno *.gcov redis.info lcov-html Makefile.dep dict-benchmark
 	rm -rf storage/*.o
+	rm -rf keydb-server
 	rm -f $(DEP)
 
 .PHONY: clean

src/server.cpp

@@ -4682,6 +4682,15 @@ sds genRedisInfoString(const char *section) {
             g_pserver->m_pstorageFactory ? g_pserver->m_pstorageFactory->name() : "none"
         );
         freeMemoryOverheadData(mh);
+
+        if (g_pserver->m_pstorageFactory)
+        {
+            info = sdscatprintf(info, 
+                "%s_memory:%zu\r\n",
+                g_pserver->m_pstorageFactory->name(),
+                g_pserver->m_pstorageFactory->totalDiskspaceUsed()
+            );
+        }
     }
 
     /* Persistence */

src/storage/teststorageprovider.h

@@ -6,6 +6,7 @@ class TestStorageFactory : public IStorageFactory
 {
     virtual class IStorage *create(int db, key_load_iterator itr) override;
     virtual const char *name() const override;
+    virtual size_t totalDiskspaceUsed() const override { return 0; }
 };
 
 class TestStorageProvider final : public IStorage