unify and streamline the blk-mq make_request implementations V2

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To: axboe@xxxxxxxxx
Subject: unify and streamline the blk-mq make_request implementations V2
From: Christoph Hellwig <hch@xxxxxx>
Date: Mon, 20 Mar 2017 16:39:26 -0400
Cc: Bart.VanAssche@xxxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx

A bunch of cleanups to get us a nice I/O submission path.

Changes since V1:
 - rebase on top of the recent blk_mq_try_issue_directly changes
 - incorporate comments from Bart

Follow-Ups:
- Re: unify and streamline the blk-mq make_request implementations V2
  - From: Bart Van Assche
- [PATCH 4/4] blk-mq: streamline blk_mq_make_request
  - From: Christoph Hellwig
- [PATCH 1/4] blk-mq: remove BLK_MQ_F_DEFER_ISSUE
  - From: Christoph Hellwig
- [PATCH 2/4] blk-mq: merge mq and sq make_request instances
  - From: Christoph Hellwig
- [PATCH 3/4] blk-mq: improve blk_mq_try_issue_directly
  - From: Christoph Hellwig

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