linux-kernel - Re: [PATCH v8 05/10] block: Add core atomic write support

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Date: Wed, 19 Jun 2024 10:02:18 +0200
From: Christoph Hellwig <hch@....de>
To: John Garry <john.g.garry@...cle.com>
Cc: Keith Busch <kbusch@...nel.org>, Christoph Hellwig <hch@....de>,
	axboe@...nel.dk, sagi@...mberg.me, jejb@...ux.ibm.com,
	martin.petersen@...cle.com, viro@...iv.linux.org.uk,
	brauner@...nel.org, dchinner@...hat.com, jack@...e.cz,
	djwong@...nel.org, linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
	linux-fsdevel@...r.kernel.org, tytso@....edu, jbongio@...gle.com,
	linux-scsi@...r.kernel.org, ojaswin@...ux.ibm.com,
	linux-aio@...ck.org, linux-btrfs@...r.kernel.org,
	io-uring@...r.kernel.org, nilay@...ux.ibm.com,
	ritesh.list@...il.com, willy@...radead.org, agk@...hat.com,
	snitzer@...nel.org, mpatocka@...hat.com, dm-devel@...ts.linux.dev,
	hare@...e.de, Himanshu Madhani <himanshu.madhani@...cle.com>
Subject: Re: [PATCH v8 05/10] block: Add core atomic write support

On Wed, Jun 19, 2024 at 08:59:33AM +0100, John Garry wrote:
> In this case, I would expect NOIOB >= atomic write boundary.
>
> Would it be sane to have a NOIOB < atomic write boundary in some other 
> config?
>
> I can support these possibilities, but the code will just get more complex.

I'd be tempted to simply not support the case where NOIOB is not a
multiple of the atomic write boundary for now and disable atomic writes
with a big fat warning (and a good comment in the soure code).  If users
show up with a device that hits this and want to use atomic writes we
can resolved it.