TAKE - reduce xfs log memory usage

[Steve Lord <lord@sgi.com>]

Some reorganization of the memory allocation for the xfs log
buffers. This has two affects, it stops us from using a 64K
chunk of memory for the 32K buffer - we now use 32K chunks.
The other is to make the log writes start on page boundaries
which will help raid5 - and everyone else probably.

Date:  Tue Mar 19 09:22:53 PST 2002
Workarea:  jen.americas.sgi.com:/src/lord/xfs-andrea

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


Modid:  2.4.x-xfs:slinx:114421a
linux/fs/xfs/xfs_log.c - 1.244
linux/fs/xfs/xfs_log_priv.h - 1.80
	- Break iclog memory into two chunks to make log writes page aligned 
	  and to save memory.