The programs implemented as part of practice are in different directories based on their chapter names.
There are READMEs in each chapter directories that contains important notes that I find are valuable to note.
For 12. File System Implementation dentry objects: http://www.makelinux.net/books/lkd2/ch12lev1sec7
define what the object is and explain what two of the functions in the operations table do. inode object dentry object superblock object http://unix.stackexchange.com/questions/4402/what-is-a-superblock-inode-dentry-and-a-file