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Jens Axboe authored
This small patch builds on top of the blk_rq_map_user() patch just sent, and enables us to easily support DMA for CDROMREADAUDIO cdda extraction. It's quite amazing how much cool stuff you can with the new block layer :-) Patch has intelligent fall back from multi frame dma to single frame dma, and further to old-style pio ripping in case of hardware problems.
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