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TAKE - narrow down use of GFP_PAGE_IO

We do not need to use GFP_PAGE_IO in as many places as we were.

Date:  Mon Apr  2 12:42:15 PDT 2001
Workarea:  jen.americas.sgi.com:/src/lord/linux-base

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


Modid:  2.4.x-xfs:slinx:91398a
linux/mm/vmscan.c - 1.52
	- Only skip flushing buffers under GFP_PAGE_IO if they are on a delalloc
	  page, this is the only case which matters.

linux/fs/xfs/xfs_buf.h - 1.70
	- Define BUF_BUSY to be PBF_DONT_BLOCK rather than zero, we can use the info
	  in pagebuf.

linux/fs/pagebuf/page_buf.c - 1.68
	- Only use GFP_PAGE_IO flag for allocates when the caller passes in the
	  PBF_DONT_BLOCK flag, this corresponds to a call from within the transaction
	  system.