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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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