--- a/fs_mark.c.orig	2011-03-22 17:04:52.194716633 +0100
+++ b/fs_mark.c	2011-03-22 17:06:11.910716645 +0100
@@ -1353,6 +1353,11 @@ int main(int argc, char **argv, char **e
 		print_iteration_stats(log_file_fp, &iteration_stats,
 				      files_written);
 		loops_done++;
+		/*
+		 * Flush dirty data to avoid interaction between unlink / log
+		 * file handling and the next iteration
+		 */
+		sync();
 
 	} while (do_fill_fs || (loop_count > loops_done));