clean up DMA draining

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To: Jens Axboe <axboe@xxxxxxxxx>
Subject: clean up DMA draining
From: Christoph Hellwig <hch@xxxxxx>
Date: Tue, 14 Apr 2020 09:42:20 +0200
Cc: linux-block@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-ide@xxxxxxxxxxxxxxx, linux-scsi@xxxxxxxxxxxxxxx

Hi all,

currently the dma draining and alignining specific to ATA CDROMs
and the UFS driver has its ugly hooks in core block code.  Move
this out into the scsi and ide drivers instead.

Follow-Ups:
- Re: clean up DMA draining
  - From: Christoph Hellwig
- [PATCH 2/5] block: provide a blk_rq_map_sg variant that returns the last element
  - From: Christoph Hellwig
- [PATCH 3/5] scsi: merge scsi_init_sgtable into scsi_init_io
  - From: Christoph Hellwig
- [PATCH 4/5] block: move dma drain handling to scsi
  - From: Christoph Hellwig
- [PATCH 5/5] block: move dma_pad handling from blk_rq_map_sg into the callers
  - From: Christoph Hellwig
- [PATCH 1/5] block: remove RQF_COPY_USER
  - From: Christoph Hellwig

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