What about inode file system? (Re: the current status of nullfs, unionfs)

[Mikhail Teterin]

A few years ago, there was a project making a filesystem, where a file's name 
will simply be its inode number. It was intended to save on the name-to-inode 
lookups of a regular filesystem, for applications like Squid, which keep file 
names in some sort of a database already.

Does anyone know, what became of that? To the naive me it seems like this can 
just be a mount option for ufs. Thanks!

	-mi