TAKE - cleanup xfs vnode layer code

[Steve Lord <lord@sgi.com>]

This is a cleanup of the layer between linux inodes and xfs, it does
clean up a few potential windows in there, and hopefully makes it less
confusing. 

Date:  Wed Mar 20 15:45:23 PST 2002
Workarea:  jen.americas.sgi.com:/src/lord/xfs-newpagebuf

The following file(s) were checked into:
  bonnie.engr.sgi.com:/isms/slinx/2.4.x-xfs


Modid:  2.4.x-xfs:slinx:114579a
linux/fs/xfs/linux/xfs_vnode.c - 1.70
linux/fs/xfs/linux/xfs_super.c - 1.163
linux/fs/xfs/linux/xfs_vnode.h - 1.27
	- rationalize xfs vnode layer code