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Date: Tue, 24 Feb 2026 16:04:01 +0100
From: Christoph Hellwig <hch@lst.de>
To: "Pankaj Raghav (Samsung)" <pankaj.raghav@linux.dev>
Cc: Christoph Hellwig <hch@lst.de>, linux-xfs@vger.kernel.org,
	linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
	lsf-pc@lists.linux-foundation.org,
	Andres Freund <andres@anarazel.de>, djwong@kernel.org,
	john.g.garry@oracle.com, willy@infradead.org, ritesh.list@gmail.com,
	jack@suse.cz, ojaswin@linux.ibm.com,
	Luis Chamberlain <mcgrof@kernel.org>, dchinner@redhat.com,
	Javier Gonzalez <javier.gonz@samsung.com>, gost.dev@samsung.com,
	tytso@mit.edu, p.raghav@samsung.com, vi.shah@samsung.com
Subject: Re: [LSF/MM/BPF TOPIC] Buffered atomic writes
Message-ID: <20260224150401.GA14612@lst.de>
References: <d0c4d95b-8064-4a7e-996d-7ad40eb4976b@linux.dev> <sjuplc6ud6ym3qyn7qmhzpr3jzjxpf6wcza3s2cenvmwwibbxr@aorfpiuxf7qy> <20260220151050.GA14064@lst.de> <rn5qoix7rattqns5ut7q6wmasjm4x3usfbh5x4e7yg22fzpiqt@744cbmehelmt>
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On Tue, Feb 24, 2026 at 01:09:58PM +0000, Pankaj Raghav (Samsung) wrote:
> As you replied, either direct IO or writethrough semantics might be the way
> forward. That is why I mentioned the first step is to do a prototype of
> writethrough and see if adding atomic support on top will make sense for
> the buffered IO path.

Yes.  And even without addin explicit writethrough semantics, this
is almost guaranteed to be a win for O_(D)SYNC.