Unix filesystems all have certain structures in common
Part of the talk is about generic Unix FS internals
Generic code is in /usr/src/linux/fs
Also /usr/src/linux/include/linux/fs.h and elsewhere
Some of the talk is about differences in ext2
ext2-specific code is in /usr/src/linux/fs/ext2
Also /usr/src/linux/include/linux/ext2*.h