block-highmem-all-19

From:	 Jens Axboe <axboe@suse.de>
To:	 Linux Kernel <linux-kernel@vger.kernel.org>
Subject: [PATCH] block-highmem-all-19
Date:	 Tue, 18 Jun 2002 14:18:46 +0200

Hi,

In preparation of 2.4.20-pre, here's an updated version of the
block-highme patch. This enables block drivers to do I/O to high memory
pages instead of reverting to low memory bounce buffers.

Changes:

- (scsi) Fix critical SCpnt->request_buffer -> SCpnt->request.buffer
  error

- (scsi) Backport __init_io() changes from 2.5, that enable us to
  politely back off on queueing more I/O with any failure. We use this
  now instead of reverting to single segment requests on sgtable
  allocation failures. For a highmem host this got nasty, because we had
  to map the buffer_head and use a bounce buffer for that single segment
  anyway. That is now eliminated. Even for non-highmem I/O the single
  segment fall back is slower because of the over head associated with
  command setup etc.

*.kernel.org/pub/linux/kernel/people/axboe/patches/v2.4/2.4.19-pre10/block-highmem-all-19.bz2

Enjoy,
-- 
Jens Axboe

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