PHP5.3(作为 Apache 模块)无法写入 /var/www/<project-name>/<document-root>/cache

请在阅读时保持耐心，因为问题似乎是透明的，但只是表面上的。情况是：

1.

OS:     fedora-16 (latest),
httpd:  apache-2.2.21,
php:    php-5.3.8 (works as apache's module)

2。主机信息：

DOCUMENT_ROOT: /var/www/[site-name]/public_html
Kohana-3.2.0 (latest stable) installed this way:
$ pwd
/var/www/<site-name>
$ ls -alp
drwxr-xr-x.  6 apache apache 4096 Jan   7 20:35 ./
drwxr-xr-x.  8 apache apache 4096 Jan   7 20:08 ../
drwxr-xr-x.  9 apache apache 4096 Jul  25 03:26 application/
drwxr-xr-x. 10 apache apache 4096 Jul  25 03:26 modules/
drwxr-xr-x.  2 apache apache 4096 Jan   7 20:35 public_html/
drwxr-xr-x. 11 apache apache 4096 Jul  25 03:26 system/
$ cd application/; ls -alp
drwxr-xr-x. 9 apache apache 4096 Jul  25 03:26 ./
drwxr-xr-x. 6 apache apache 4096 Jan   7 20:35 ../
-rwxr-xr-x. 1 apache apache 3612 Jul  25 03:22 bootstrap.php
drwxrwxrwx. 2 apache apache 4096 Jan   8 20:14 cache/
drwxr-xr-x. 4 apache apache 4096 Jul  25 03:26 classes/
drwxr-xr-x. 2 apache apache 4096 Jul  25 03:26 config/
drwxr-xr-x. 2 apache apache 4096 Jul  25 03:26 i18n/
drwxrwxrwx. 2 apache apache 4096 Jul  25 03:26 logs/
drwxr-xr-x. 2 apache apache 4096 Jul  25 03:26 messages/
drwxr-xr-x. 2 apache apache 4096 Jul  25 03:26 views/
Command `top` says that Apache is really starts under `apache` user privileges.

那么，我怎么能让应用程序/缓存和应用程序/日志目录是不可写的呢？-我也用检查过

var_dump(fopen($_SERVER['DOCUMENT_ROOT'] . '/../application/cache/something.txt', 'w+'));

同样的结果。不知道它是怎么回事。没有符号链接，没有安装的驱动器等等。有人遇到过这样的情况吗？