extern int __must_check generic_open_file(struct thread_data *, struct fio_file *);
extern int __must_check generic_close_file(struct thread_data *, struct fio_file *);
extern int __must_check generic_get_file_size(struct thread_data *, struct fio_file *);
+extern int __must_check file_lookup_open(struct fio_file *f, int flags);
extern int __must_check pre_read_files(struct thread_data *);
extern int add_file(struct thread_data *, const char *);
extern int add_file_exclusive(struct thread_data *, const char *);