Are there restaurants available before you go through security

I don't think so, I was there last weekend. I don't remember seeing anything. But maybe, I have only one bag so I went straight To the check point.

Yes and yes. They may not be open depending on time and day. Go to pdx.com and bring up a map, then call the eateriesshown for hours.

Yes they had a couple in the main area before you go thru security

Yes, a few right before security.

I don't remember seeing any before..but there are after