1. An adjustment layer.
2. A luminosity mask for that adjustment layer.

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Wanted:
I want to edit that adjustment layer's mask in the editing area, viewing the mask as a black and white image.
Current procedure:
1. Create a new raster layer.
2. Change the Foreground Material to black.
3. Select the Fill tool.
4. Fill that new raster layer with black.
5. Move that black raster layer below the adjustment layer.
6. Select the adjustment layer.
7. Open the Properties of the adjustment layer.
8. Change the overlay colour to white.
9. Change the overlay opacity to 100%.
10. Select "Highlight Mask Area" in the Layers palette.
Questions:
1. Is there an easier way to do this?
2. If not, I've recorded a script that starts with the adjustment layer selected, but the script fails when attempting to move the new raster layer below the adjustment layer.
