Re: [PATCH 3/3] block: set REQ_PREFLUSH to the final bio from __blkdev_issue_zero_pages()

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To: Tom Yan <tom.ty89@xxxxxxxxx>
Subject: Re: [PATCH 3/3] block: set REQ_PREFLUSH to the final bio from __blkdev_issue_zero_pages()
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Mon, 7 Dec 2020 13:35:10 +0000
Cc: linux-block@xxxxxxxxxxxxxxx, linux-scsi@xxxxxxxxxxxxxxx
In-reply-to: <20201206055332.3144-3-tom.ty89@gmail.com>

On Sun, Dec 06, 2020 at 01:53:32PM +0800, Tom Yan wrote:
> Mimicking blkdev_issue_flush(). Seems like a right thing to do, as
> they are a bunch of REQ_OP_WRITE.

Huh?  Zeroing out is in no way a data integrity operation that needs a
reflush.

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References:
- [PATCH 1/3] block: try one write zeroes request before going further
  - From: Tom Yan
- [PATCH 3/3] block: set REQ_PREFLUSH to the final bio from __blkdev_issue_zero_pages()
  - From: Tom Yan

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