The literature review can be a key part of your dissertation structure. It is unlikely that you will have the time to read every word available on your topic, however in the literature review you should aim to demonstrate wide reading. The literature review will focus on authoritative works. You will not be discussing a popular, mass market text on the subject (unless that book has been written by an expert or led to an academic response). Evaluate each relevant book or article you discover to assess whether it is written for an academic audience or written by an academic.
Do not begin analysing the literature before clarifying in your own mind the research questions that will guide your dissertation. By formulating problems beforehand, you will avoid wasting hours in aimless reading. Know the issues of concern to you and consider the material through this lens alone.