TAKE - more pagebuf tweaks

[Steve Lord <lord@sgi.com>]

On second thoughts, we do not need a zone for pagebuf targets at
all. They are a one per fs thing, and we only mess with them at
mount and unmount time. Code is a little simpler without them
altogether.

Date:  Thu May 30 04:10:16 PDT 2002
Workarea:  jen.americas.sgi.com:/src/lord/xfs-baseline

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


Modid:  2.4.x-xfs:slinx:120439a
linux/fs/xfs/pagebuf/Makefile - 1.8
	- fix up module exports

linux/fs/xfs/pagebuf/page_buf_locking.c - 1.12
	- get rid of the zone for pagebuf target structures, just kmalloc it

linux/fs/xfs/pagebuf/page_buf.c - 1.27
linux/fs/xfs/pagebuf/page_buf_internal.h - 1.7
	- No need for a locking terminate call anymore