extern void init_disk_util(struct thread_data *);
extern void update_rusage_stat(struct thread_data *);
extern void setup_log(struct io_log **, unsigned long, int);
-extern void finish_log(struct thread_data *, struct io_log *, const char *);
-extern void finish_log_named(struct thread_data *, struct io_log *, const char *, const char *);
+extern int finish_log(struct thread_data *, struct io_log *, const char *, int);
+extern int finish_log_named(struct thread_data *, struct io_log *, const char *, const char *, int);
extern void __finish_log(struct io_log *, const char *);
extern struct io_log *agg_io_log[DDIR_RWDIR_CNT];
extern int write_bw_log;