mmap加载配置文件，uring实现持久化

kvs_oplog.h

@@ -0,0 +1,14 @@
+#ifndef __KVS_INC_LOG_H__
+#define __KVS_INC_LOG_H__
+
+#include <stdint.h>
+#include <stdio.h>
+
+int init_cmd_log(const char *file, int *logfd);
+int destroy_cmd_log(int logfd);
+
+int kvs_oplog_append(const uint8_t *cmd, size_t len, int logfd);
+int kvs_replay_log(int logfd);
+int ksv_clear_log(int logfd);
+
+#endif