cache directio flag in open file cache
diff --git a/src/core/ngx_open_file_cache.h b/src/core/ngx_open_file_cache.h
index b15de1d..af39094 100644
--- a/src/core/ngx_open_file_cache.h
+++ b/src/core/ngx_open_file_cache.h
@@ -63,6 +63,7 @@
     unsigned                 is_file:1;
     unsigned                 is_link:1;
     unsigned                 is_exec:1;
+    unsigned                 is_directio:1;
 
     ngx_event_t             *event;
 };