new file mode 100644
--- /dev/null
+++ b/src/core/ngx_open_file_cache.h
@@ -0,0 +1,100 @@
+
+/*
+ * Copyright (C) Igor Sysoev
+ */
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+
+
+#ifndef _NGX_OPEN_FILE_CACHE_H_INCLUDED_
+#define _NGX_OPEN_FILE_CACHE_H_INCLUDED_
+
+
+typedef struct {
+    ngx_fd_t                 fd;
+    ngx_file_uniq_t          uniq;
+    time_t                   mtime;
+    off_t                    size;
+    ngx_err_t                err;
+
+    time_t                   retest;
+
+    unsigned                 test_dir:1;
+    unsigned                 errors:1;
+
+    unsigned                 is_dir:1;
+    unsigned                 is_file:1;
+    unsigned                 is_link:1;
+    unsigned                 is_exec:1;
+} ngx_open_file_info_t;
+
+
+typedef struct ngx_cached_open_file_s  ngx_cached_open_file_t;
+
+struct ngx_cached_open_file_s {
+    ngx_rbtree_node_t        node;
+    ngx_cached_open_file_t  *prev;
+    ngx_cached_open_file_t  *next;
+
+    u_char                  *name;
+    time_t                   created;
+    time_t                   accessed;
+
+    ngx_fd_t                 fd;
+    ngx_file_uniq_t          uniq;
+    time_t                   mtime;
+    off_t                    size;
+    ngx_err_t                err;
+
+    unsigned                 count:24;
+    unsigned                 close:1;
+
+    unsigned                 is_dir:1;
+    unsigned                 is_file:1;
+    unsigned                 is_link:1;
+    unsigned                 is_exec:1;
+
+    ngx_event_t             *event;
+};
+
+
+typedef struct {
+    ngx_rbtree_t             rbtree;
+    ngx_cached_open_file_t   list_head;
+    ngx_cached_open_file_t   list_tail;
+
+    ngx_uint_t               current;
+    ngx_uint_t               max;
+    time_t                   inactive;
+} ngx_open_file_cache_t;
+
+
+typedef struct {
+    ngx_open_file_cache_t   *cache;
+    ngx_cached_open_file_t  *file;
+    ngx_log_t               *log;
+} ngx_open_file_cache_cleanup_t;
+
+
+typedef struct {
+
+    /* ngx_connection_t stub to allow use c->fd as event ident */
+    void                    *data;
+    ngx_event_t             *read;
+    ngx_event_t             *write;
+    ngx_fd_t                 fd;
+
+    ngx_cached_open_file_t  *file;
+    ngx_open_file_cache_t   *cache;
+} ngx_open_file_cache_event_t;
+
+
+ngx_open_file_cache_t *ngx_open_file_cache_init(ngx_pool_t *pool,
+    ngx_uint_t max, time_t inactive);
+ngx_int_t ngx_open_cached_file(ngx_open_file_cache_t *cache, ngx_str_t *name,
+    ngx_open_file_info_t *of, ngx_pool_t *pool);
+
+
+#endif /* _NGX_OPEN_FILE_CACHE_H_INCLUDED_ */