SEE BOB'S ANSWER - Porch swing in my living room

I would like to know if there is anyway to install a porch swing in my living room with out it cracking my sheetrock from the weight or movement or damaging the ceiling. I have 2X6 joist running east and west the swing will hang north to south. It's not going to be by a wall it's going to be in the open. I need to know if I need to put braces in the attic or etc... Please Help.