always use REQ_OP_WRITE_ZEROES for zeroing offload V2

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Subject: always use REQ_OP_WRITE_ZEROES for zeroing offload V2
From: Christoph Hellwig <hch@xxxxxx>
Date: Wed, 5 Apr 2017 19:20:58 +0200
Cc: linux-block@xxxxxxxxxxxxxxx, linux-raid@xxxxxxxxxxxxxxx, dm-devel@xxxxxxxxxx, linux-scsi@xxxxxxxxxxxxxxx, drbd-dev@xxxxxxxxxxxxxxxx
Dmarc-filter: OpenDMARC Filter v1.3.2 mx1.redhat.com E46A3C05973D
Dmarc-filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 79DF36AADA

This series makes REQ_OP_WRITE_ZEROES the only zeroing offload
supported by the block layer, and switches existing implementations
of REQ_OP_DISCARD that correctly set discard_zeroes_data to it,
removes incorrect discard_zeroes_data, and also switches WRITE SAME
based zeroing in SCSI to this new method.

The series is against the block for-next tree.

A git tree is also avaiable at:

    git://git.infradead.org/users/hch/block.git discard-rework.2

Gitweb:

    http://git.infradead.org/users/hch/block.git/shortlog/refs/heads/discard-rework.2

Changes since V2:
 - various spelling fixes
 - various reviews captured
 - two new patches from Martin at the end

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Follow-Ups:
- Re: always use REQ_OP_WRITE_ZEROES for zeroing offload V2
  - From: Jens Axboe
- [PATCH 26/27] scsi: sd: Separate zeroout and discard command choices
  - From: Christoph Hellwig
- [PATCH 27/27] scsi: sd: Remove LBPRZ dependency for discards
  - From: Christoph Hellwig
- [PATCH 25/27] block: remove the discard_zeroes_data flag
  - From: Christoph Hellwig
- [PATCH 24/27] drbd: implement REQ_OP_WRITE_ZEROES
  - From: Christoph Hellwig
- [PATCH 23/27] drbd: make intelligent use of blkdev_issue_zeroout
  - From: Christoph Hellwig
- [PATCH 22/27] block: stop using discards for zeroing
  - From: Christoph Hellwig
- [PATCH 21/27] mmc: remove the discard_zeroes_data flag
  - From: Christoph Hellwig
- [PATCH 20/27] rsxx: remove the discard_zeroes_data flag
  - From: Christoph Hellwig
- [PATCH 19/27] rbd: remove the discard_zeroes_data flag
  - From: Christoph Hellwig
- [PATCH 18/27] brd: remove discard support
  - From: Christoph Hellwig
- [PATCH 16/27] zram: implement REQ_OP_WRITE_ZEROES
  - From: Christoph Hellwig
- [PATCH 17/27] loop: implement REQ_OP_WRITE_ZEROES
  - From: Christoph Hellwig
- [PATCH 15/27] nvme: implement REQ_OP_WRITE_ZEROES
  - From: Christoph Hellwig
- [PATCH 14/27] sd: implement unmapping Write Zeroes
  - From: Christoph Hellwig
- [PATCH 13/27] block_dev: use blkdev_issue_zerout for hole punches
  - From: Christoph Hellwig
- [PATCH 12/27] block: add a new BLKDEV_ZERO_NOFALLBACK flag
  - From: Christoph Hellwig
- [PATCH 09/27] block: stop using blkdev_issue_write_same for zeroing
  - From: Christoph Hellwig
- [PATCH 11/27] block: add a REQ_NOUNMAP flag for REQ_OP_WRITE_ZEROES
  - From: Christoph Hellwig
- [PATCH 10/27] block: add a flags argument to (__)blkdev_issue_zeroout
  - From: Christoph Hellwig
- [PATCH 07/27] dm: support REQ_OP_WRITE_ZEROES
  - From: Christoph Hellwig
- [PATCH 08/27] dm kcopyd: switch to use REQ_OP_WRITE_ZEROES
  - From: Christoph Hellwig
- [PATCH 02/27] block: renumber REQ_OP_WRITE_ZEROES
  - From: Christoph Hellwig
- [PATCH 05/27] md: support REQ_OP_WRITE_ZEROES
  - From: Christoph Hellwig
- [PATCH 01/27] sd: split sd_setup_discard_cmnd
  - From: Christoph Hellwig
- [PATCH 03/27] block: implement splitting of REQ_OP_WRITE_ZEROES bios
  - From: Christoph Hellwig
- [PATCH 06/27] dm io: discards don't take a payload
  - From: Christoph Hellwig
- [PATCH 04/27] sd: implement REQ_OP_WRITE_ZEROES
  - From: Christoph Hellwig

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