These changes are trivial.

The intent of this patch is to delete the variant handling of the
rootvnode variable.

The change sets the fd_rdir portion for the fdp struct in the
non-chroot case so that it will be inherited across fork() calls.

This fixes a number of security problems for the relative pathed
lookups following the chroot() call.  

This also fixes a couple of security problems in the case where
there is an implementation of the namespace escape for support
of an inode namespace.

This gets rid of a test and set in the default case of a path
lookup in the namei() code.  It should be a performance win (but
only measurable if you have non-statistical kernel profiling, a
patch of mine which has yet to be submitted).  Otherwise, it's net
zero (as far as you can measure it: 14 instruction cycles per namei),
so there's no reason to not commit it.

End Of Document.