Directory File Inode Structure

[Igug Moderator]

Would someone clarify something for me?

Over a period of time I understand that a directory file will continue
to grow as new inode slots are added.  When the files in a directory
get deleted and the inode is nulled out, the size of the directory yet
remains the same. Fine, now when I begin to add files again are the
old slots, that were nulled, reused in the same sequence?  Also, will I
encounter 'file system indirection' only when I access a file that has
its inode in the 321st slot?

Also, can I look at a directory file with fsdb and can anyone recommend
a good book that covers use of fsdb.

Thanks