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TAKE - cleanup request layout checking, add EVMS

To: linux-xfs@xxxxxxxxxxx
Subject: TAKE - cleanup request layout checking, add EVMS
From: Steve Lord <lord@xxxxxxx>
Date: Thu, 11 Jul 2002 12:26:24 -0500
Sender: owner-linux-xfs@xxxxxxxxxxx
Rationalize how we work out the allowed sizes of requests,
we now do the checks at mount time, and a much simpler
test at IO time. Also add knowledge of EVMS and fix some
code added on monday. I would appreciate reports from MD and LVM


Date:  Thu Jul 11 10:29:33 PDT 2002
Workarea:  jen.americas.sgi.com:/src/lord/xfs-linux.2.4

The following file(s) were checked into:

Modid:  2.4.x-xfs:slinx:122857a
linux/fs/xfs/pagebuf/page_buf_locking.c - 1.18
        - Do determination of allowed request layouts at mount time
          rather than at request time. Probably about a million less
          tests this way.

linux/fs/xfs/pagebuf/page_buf.c - 1.38
        - More cleanup of page locking during read, also rationalize the
          code in the I/O path which understands the layour restrictions
          of specific device types.

linux/fs/xfs/pagebuf/page_buf.h - 1.26
        - add new flags field to pb_target structure

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