linux-kernel - Re: [PATCH v6 10/13] xfs: iomap COW-based atomic write support

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Message-ID: <20250318053516.GC14470@lst.de>
Date: Tue, 18 Mar 2025 06:35:16 +0100
From: Christoph Hellwig <hch@....de>
To: John Garry <john.g.garry@...cle.com>
Cc: "Ritesh Harjani (IBM)" <ritesh.list@...il.com>, brauner@...nel.org,
	djwong@...nel.org, cem@...nel.org, dchinner@...hat.com, hch@....de,
	linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, ojaswin@...ux.ibm.com,
	martin.petersen@...cle.com, tytso@....edu,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH v6 10/13] xfs: iomap COW-based atomic write support

On Mon, Mar 17, 2025 at 02:56:52PM +0000, John Garry wrote:
> ok, fine. I am just worried that these commit messages become too wordy. 
> But, if people want this info, then I can provide it.

While too wordy commit messages do exit, you're really far from that
threshold.  So yes, please explain this.

I think we also really need a document outside of commit logs and
comments that explains the exact atomic write semantics and how
we implement them between the hardware offload and always COW writes.