Here, http://arstechnica.com/articles/paedia/past-present-future-file-systems.ars, you may find an article about file systems. It is very light weight and, most importantly, 9fs is not menitoned. I am posting this if somebody with an account at Ars would like to use the comments to correct this omission.
bengt -- Those were the days... EPO guidelines 1978: "If the contribution to the known art resides solely in a computer program then the subject matter is not patentable in whatever manner it may be presented in the claims."
