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Subject[PATCH] block-highmem-all-19

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.


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

- (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.


Jens Axboe

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