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TAKE - remove the kiobuf from the pagebuf structure

Subject: TAKE - remove the kiobuf from the pagebuf structure
From: Steve Lord <lord@xxxxxxx>
Date: Wed, 9 May 2001 15:59:22 -0500
Sender: owner-linux-xfs@xxxxxxxxxxx
The fact that the size of the kiobuf was grown to be huge, and that
1024 buffer heads were automatically allocated for each one made them
somewhat untenable for use within pagebuf. Therefore I have removed
them and the kiobuf code in our tree reverts to the original version.

This should make XFS on a 2.4.4 kernel a more pleasant experience.

Date:  Wed May  9 13:54:27 PDT 2001
Workarea:  jen.americas.sgi.com:/src/lord/xfs-base

The following file(s) were checked into:

Modid:  2.4.x-xfs:slinx:94460a
linux/mm/memory.c - 1.48
linux/kernel/ksyms.c - 1.88
linux/init/main.c - 1.53
        - revert to vanilla 2.4.4 code base as far as kiobufs are concerned.

linux/fs/iobuf.c - 1.20
linux/include/linux/iobuf.h - 1.14
        - revert to vanilla 2.4.4 code base - no longer need xfs specials in 

linux/include/linux/page_buf.h - 1.90
        - Change pagebuf structure to contain the parts of the kiobuf we 

linux/kdb/modules/kdbm_pg.c - 1.34
        - account for changes in pagebuf structure

linux/fs/pagebuf/page_buf.c - 1.80
        - We now allocate our own array of pages rather than using a kiobuf. The
          kiobuf overhead was getting too great.

linux/fs/pagebuf/page_buf_io.c - 1.78
        - Change direct I/O path to allocate its own kiobuf and point the 
          at it's list of pages.

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