TAKE - I/O path cleanups

[hch@lab343.munich.sgi.com]

Prepare implementing a writepages method in 2.5.
There is still some work to do in this area..


Date:  Fri Sep 27 08:42:03 PDT 2002
Workarea:  lab343.munich.sgi.com:/home/hch/repo/slinx/2.4.x-xfs-iopath

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


Modid:  2.4.x-xfs:slinx:128581a
linux/fs/xfs/linux/xfs_aops.c - 1.6
	- Move some more common code into delalloc_convert.
	  Remove release_page/write_full_page wrappers.
	  Merge map_page into convert_page.
	  Small code tidyups.