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TAKE - simplify pagebuf code a little bit

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Subject: TAKE - simplify pagebuf code a little bit
From: Steve Lord <lord@xxxxxxx>
Date: Thu, 25 Jan 2001 15:07:21 -0600
Sender: owner-linux-xfs@xxxxxxxxxxx
The original pagebuf structure had the ability to have an associated kiovec
this vector has never been used with more than one element in it. This
simplifies the code to just contain a single kiobuf pointer.

Also remove some debug code and do a couple of minor tweaks in the pagebuf
I/O path.

Date:  Thu Jan 25 13:04:55 PST 2001
Workarea:  jen.americas.sgi.com:/src/lord/xfs-linux.2.4

The following file(s) were checked into:

Modid:  2.4.x-xfs:slinx:83189a
linux/fs/xfs/linux/xfs_lrw.c - 1.74
        - remove debug code.

linux/include/linux/page_buf.h - 1.71
        - Remove kiovec capability from pagebuf.

linux/kdb/modules/kdbm_pg.c - 1.26
        - Remove kiovec capability from pagebuf

linux/fs/pagebuf/page_buf.c - 1.48
        - Remove kiovec capability from pagebuf, just use one kiobuf

linux/fs/pagebuf/page_buf_io.c - 1.46
        - remove debug code, change from kiovec to kiobuf

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