+static size_t open_count = 0;
+
+static int check_online(int fd);
+static int file_open(int fd);
+static void file_close(int fd);
+static void file_release(int fd);
+static size_t get_record_size(struct file_info *fi, off_t record);
+static void put_record_size(struct file_info *fi, off_t record, size_t size);