求解，文件给的是0777 ，但是还是报这个错，求各位大神救命啊...

PHP Fatal error: Uncaught UnexpectedValueException: The stream or file "/usr/share/nginx/html/admin/storage/logs/laravel-2016-05-26.log" could not be opened: failed to open stream: Permission denied in /usr/share/nginx/html/admin/vendor/monolog/monolog/src/Monolog/Handler/StreamHandler.php:95