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Yep. Linseed oil paint, and resin mediums. Attesting to the permanence of such applications are the great number of street numbers gilded or painted in the transoms of old buildings, many well over 100 years old. Humidity and washing are the enemies of paint on glass.
Gesso, either the "real thing" (whiting and gypsum in hide glue) or the acrylic variety will not stick well to glass and are unnecessary.
Perhaps the coating you referred to on the back of the glass was intended to supply a visible "ground" for the painting. If so, a coat of flake white extended with damar and linseed oil stippled on the backside will make a pleasant background for the painting, toned by the natural color of the glass. If you wish to "draw" before beginning to paint, I'd recommend using a Stabilo pencil, works texturally like a grease pencil, but the material is both compatible with paint (i.e. it will not cause paint to "crawl" nor will it strike through) and easily removable with a damp rag.
Paint "stacks" rapidly on glass, and the thicker the "build up" the worse it looks. A levelling medium like stand oil and canada balsam will help keep your layers thin and lying flat.
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