Cache: added watermark to reduce IO load when keys_zone is full. When a keys_zone is full then each next request to the cache is penalized. That is, the cache has to evict older files to get a slot from the keys_zone synchronously. The patch introduces new behavior in this scenario. Manager will try to maintain available free slots in the keys_zone by cleaning old files in the background.

/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_CRYPT_H_INCLUDED_
#define _NGX_CRYPT_H_INCLUDED_


#include <ngx_config.h>
#include <ngx_core.h>


ngx_int_t ngx_crypt(ngx_pool_t *pool, u_char *key, u_char *salt,
    u_char **encrypted);


#endif /* _NGX_CRYPT_H_INCLUDED_ */