Differences between NetBSD 3.0 and 4.0 with regard to the filesystem

[Hans Petter Selasky <hselasky%c2i.net@localhost>]

Hi,

I have a file system that is maintained outside the NetBSD repository. It 
works fine on NetBSD 3.0, but when the same code is used on NetBSD 4.0 the 
kernel will panic regularly due to uvm faults at random places.

I don't have time to rewrite this piece of software and I need to know what 
has changed between the 3.0 and 4.0 release of NetBSD with regard to the file 
system.

Aditionally: Where is the file system locking document ?

Thanks,
--HPS