The top outside investors and their approx. investment values are: Alphabet ($94B+), Valor Equity Partners ($86B), Founders Fund ($73B), Fidelity Investments ($51B), Vy Capital ($40B), Gigafund Management ($29B).
Sounds interesting and challenging. There's something similar, although not the build part just the modular aspect of it inspired by CPAN called CCAN: https://ccodearchive.net/. Very few people know about it, I believe, and it goes way back. I'm not involved with that project, though. Good luck!
Agree. The VFS is a delight to read. It's a good intro to the kernel pattern of using function pointers to provide a generic API which other functionality can plug into, simply by implementing the appropriate functions. In this case you'll see all the filesystem drivers implement the VFS operations.
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