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TAKE - narrow down use of GFP_PAGE_IO

Subject: TAKE - narrow down use of GFP_PAGE_IO
From: Steve Lord <lord@xxxxxxx>
Date: Mon, 2 Apr 2001 14:41:28 -0500
Sender: owner-linux-xfs@xxxxxxxxxxx
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:

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 
          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 

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