simlify the blk_rq_map* implementation and reclaim two bio flags

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To: axboe@xxxxxxxxx
Subject: simlify the blk_rq_map* implementation and reclaim two bio flags
From: Christoph Hellwig <hch@xxxxxx>
Date: Thu, 27 Aug 2020 17:37:44 +0200
Cc: linux-block@xxxxxxxxxxxxxxx

Hi Jens,

this series cleans up some of the passthrough remapping code, and as
part of that reclaims two bio flags.

Follow-Ups:
- Re: simlify the blk_rq_map* implementation and reclaim two bio flags
  - From: Jens Axboe
- [PATCH 4/4] block: remove the BIO_USER_MAPPED flag
  - From: Christoph Hellwig
- [PATCH 3/4] block: remove __blk_rq_map_user_iov
  - From: Christoph Hellwig
- [PATCH 2/4] block: remove __blk_rq_unmap_user
  - From: Christoph Hellwig
- [PATCH 1/4] block: remove the BIO_NULL_MAPPED flag
  - From: Christoph Hellwig

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