a few passthrough request improvements

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To: axboe@xxxxxxxxx
Subject: a few passthrough request improvements
From: Christoph Hellwig <hch@xxxxxx>
Date: Mon, 13 Jun 2016 17:21:11 +0200
Cc: mst@xxxxxxxxxx, ooo@xxxxxxxxxxxxxxx, bhalevy@xxxxxxxxxxxxxxx, nab@xxxxxxxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx

These days we have a lot more users of struct request for driver internal
use than just REQ_TYPE_BLOCK_PC, so let's polish this infrastructure
up a bit.

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Follow-Ups:
- [PATCH 6/7] scsi/osd: open code blk_make_request
  - From: Christoph Hellwig
- [PATCH 7/7] block: unexport various bio mapping helpers
  - From: Christoph Hellwig
- [PATCH 5/7] target: stop using blk_make_request
  - From: Christoph Hellwig
- [PATCH 4/7] block: simplify and export blk_rq_append_bio
  - From: Christoph Hellwig
- [PATCH 3/7] block: ensure bios return from blk_get_request are properly initialized
  - From: Christoph Hellwig
- [PATCH 2/7] virtio_blk: use blk_rq_map_kern
  - From: Christoph Hellwig
- [PATCH 1/7] memstick: don't allow REQ_TYPE_BLOCK_PC requests
  - From: Christoph Hellwig

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