linux-kernel - Re: [PATCH v6 0/6] block/md/dm: set chunk

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Message-ID: <20250714104615.GA30407@lst.de>
Date: Mon, 14 Jul 2025 12:46:15 +0200
From: Christoph Hellwig <hch@....de>
To: John Garry <john.g.garry@...cle.com>
Cc: Christoph Hellwig <hch@....de>, Damien Le Moal <dlemoal@...nel.org>,
	agk@...hat.com, snitzer@...nel.org, mpatocka@...hat.com,
	song@...nel.org, yukuai3@...wei.com, nilay@...ux.ibm.com,
	axboe@...nel.dk, cem@...nel.org, dm-devel@...ts.linux.dev,
	linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
	linux-block@...r.kernel.org, ojaswin@...ux.ibm.com,
	martin.petersen@...cle.com, akpm@...ux-foundation.org,
	linux-xfs@...r.kernel.org, djwong@...nel.org
Subject: Re: [PATCH v6 0/6] block/md/dm: set chunk_sectors from stacked dev
 stripe size

On Mon, Jul 14, 2025 at 08:52:39AM +0100, John Garry wrote:
> On 14/07/2025 06:53, Christoph Hellwig wrote:
>> Now we should be able to implement the software atomic writes pretty
>> easily for zoned XFS, and funnily they might actually be slightly faster
>> than normal writes due to the transaction batching.  Now that we're
>> getting reasonable test coverage we should be able to give it a spin, but
>> I have a few too many things on my plate at the moment.
>
> Isn't reflink currently incompatible with zoned xfs?

reflink itself yes due to the garbage collection algorithm that is not
reflink aware.  But all I/O on zoned file RT device uses the same I/O
path design as writes that unshare reflinks because it always has to
write out of place.