Re: [PATCH 25/27] block: remove the discard_zeroes_data flag

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To: "Nicholas A. Bellinger" <nab@xxxxxxxxxxxxxxx>
Subject: Re: [PATCH 25/27] block: remove the discard_zeroes_data flag
From: "hch@xxxxxx" <hch@xxxxxx>
Date: Thu, 11 May 2017 08:26:30 +0200
Cc: "hch@xxxxxx" <hch@xxxxxx>, Bart Van Assche <Bart.VanAssche@xxxxxxxxxxx>, "agk@xxxxxxxxxx" <agk@xxxxxxxxxx>, "lars.ellenberg@xxxxxxxxxx" <lars.ellenberg@xxxxxxxxxx>, "snitzer@xxxxxxxxxx" <snitzer@xxxxxxxxxx>, "martin.petersen@xxxxxxxxxx" <martin.petersen@xxxxxxxxxx>, "philipp.reisner@xxxxxxxxxx" <philipp.reisner@xxxxxxxxxx>, "axboe@xxxxxxxxx" <axboe@xxxxxxxxx>, "shli@xxxxxxxxxx" <shli@xxxxxxxxxx>, "linux-scsi@xxxxxxxxxxxxxxx" <linux-scsi@xxxxxxxxxxxxxxx>, "dm-devel@xxxxxxxxxx" <dm-devel@xxxxxxxxxx>, "drbd-dev@xxxxxxxxxxxxxxxx" <drbd-dev@xxxxxxxxxxxxxxxx>, "linux-block@xxxxxxxxxxxxxxx" <linux-block@xxxxxxxxxxxxxxx>, "target-devel@xxxxxxxxxxxxxxx" <target-devel@xxxxxxxxxxxxxxx>, "linux-raid@xxxxxxxxxxxxxxx" <linux-raid@xxxxxxxxxxxxxxx>
In-reply-to: <1494478235.16894.115.camel@haakon3.risingtidesystems.com>
User-agent: Mutt/1.5.17 (2007-11-01)

On Wed, May 10, 2017 at 09:50:35PM -0700, Nicholas A. Bellinger wrote:
> 1) Expose a block_device or request_queue bit to signal 'real LBPRZ'
> support up to IBLOCK, in order to maintain SCSI target feature
> compatibility.

No way.  If you want to zero use REQ_OP_WRITE_ZEROES..

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References:
- [PATCH 25/27] block: remove the discard_zeroes_data flag
  - From: Christoph Hellwig
- Re: [PATCH 25/27] block: remove the discard_zeroes_data flag
  - From: Bart Van Assche
- Re: [PATCH 25/27] block: remove the discard_zeroes_data flag
  - From: Nicholas A. Bellinger
- Re: [PATCH 25/27] block: remove the discard_zeroes_data flag
  - From: Nicholas A. Bellinger
- Re: [PATCH 25/27] block: remove the discard_zeroes_data flag
  - From: hch@xxxxxx
- Re: [PATCH 25/27] block: remove the discard_zeroes_data flag
  - From: Nicholas A. Bellinger
- Re: [PATCH 25/27] block: remove the discard_zeroes_data flag
  - From: hch@xxxxxx
- Re: [PATCH 25/27] block: remove the discard_zeroes_data flag
  - From: Nicholas A. Bellinger
- Re: [PATCH 25/27] block: remove the discard_zeroes_data flag
  - From: hch@xxxxxx
- Re: [PATCH 25/27] block: remove the discard_zeroes_data flag
  - From: Nicholas A. Bellinger

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