site subdirectory acts as root dir? Should I redirect 301 permanent?

I have the following problem - my site is located one folder below the /www folder on my hosting account, let's say its /www/shop. All the visitors that come to the main domain are then redirected by .htaccess file in the /www folder which takes them to the subfolder.

Should I make this redirect 301 Permanent, so that search engines could index my site better? Here's the simple .htaccess that I use for the purpo开发者_如何学Gose:

RewriteEngine On
RewriteRule ^$ /shop [L]

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As long as it's really permanent, yes.