TAKE - merge page_buf_private_t into page_buf_t

[Christoph Hellwig <hch@lab343.munich.sgi.com>]

The abstraction didn't buy us anything, all accesses from XFS code to
pagebuf's are through the xfs_buf.h macros anyway.


Date:  Wed Dec 11 09:18:29 PST 2002
Workarea:  lab343.munich.sgi.com:/home/hch/repo/slinx/2.4.x-xfs

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


Modid:  2.4.x-xfs:slinx:134949a
linux/fs/xfs/xfsidbg.c - 1.212
	- use page_buf_t instead of page_buf_private_t

linux/fs/xfs/pagebuf/page_buf_locking.c - 1.35
linux/fs/xfs/pagebuf/page_buf.c - 1.87
	- get rid of PBP() uses

linux/fs/xfs/pagebuf/page_buf.h - 1.53
	- add fields formerly in page_buf_private_t to page_buf_t

linux/fs/xfs/pagebuf/page_buf_internal.h - 1.21
	- remove page_buf_private_t