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From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org>
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Subject: Re: FreeBSD file system example and question
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Marcin <marcin@desk.pl> writes:

> Hello, where can i find information or examples of how to write a file system for FreeBSD, apart from /usr/src/sys/* and /usr/share/man/*?

The Architecure Handbook. (/usr/share/doc/en/arch-handbook)

The old McKusick book (/usr/share/doc/en/design-44bsd)
 
The new McKusick book (ISBN 0-201-70245-2)

> What is vnode_if.h for? Why is it generated for every fs module if it is the same every time? I tried to google for the answer but found nothing. Only a note on Darwin's dev site.

If I recall correctly that was a Sun-ism originally.
It can be useful as a cross-platform tool, but I don't know if anyone
is using it that way these days.