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c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1771600255; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=nXcYtcs7D5m+en4RUmtKRReycKapPxSBEVRUuc3/3Xg=; b=buukg4H0eCtjPasNofiY3NJvJT1Z0eiXaSz0VbsfgyjC8WxuC9AZEsOJzfLTzJnJXAKRkp DMGLk5dqb71Xf4t0ik88utyYymc+SBcF9T3huOB0HqfZY1sTUjPIgaowwkdli/sxyNekvw hWaHVy7BCOCQqtJA/pVC/QeMbxd0uZ4= Received: by verein.lst.de (Postfix, from userid 2407) id 71F7668B05; Fri, 20 Feb 2026 16:10:50 +0100 (CET) Date: Fri, 20 Feb 2026 16:10:50 +0100 From: Christoph Hellwig To: "Pankaj Raghav (Samsung)" Cc: linux-xfs@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, lsf-pc@lists.linux-foundation.org, Andres Freund , djwong@kernel.org, john.g.garry@oracle.com, willy@infradead.org, hch@lst.de, ritesh.list@gmail.com, jack@suse.cz, ojaswin@linux.ibm.com, Luis Chamberlain , dchinner@redhat.com, Javier Gonzalez , 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: <20260220151050.GA14064@lst.de> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.17 (2007-11-01) X-Stat-Signature: cs53ightzkq86khbm8kz9dr8qyise875 X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: CC9B314000D X-HE-Tag: 1771600254-893320 X-HE-Meta: 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 qoLK9rtK WqhB7DajeOJXvfemurubDbKb/peYCH/mBV1KCNdpQ2LucY0b/RWIiVajKqpcn8j/7gkjAwEoZaJg795SusUJ6UYVHONLT+qdA4EkZUFGZ+OFp92hXoHwyF347aSjFkgOmTcJ79b/gzi7YHKcu28R42nDDaZTjJ+nOlj288EOvVoS2f3Q= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Feb 20, 2026 at 10:08:26AM +0000, Pankaj Raghav (Samsung) wrote: > On Fri, Feb 13, 2026 at 11:20:36AM +0100, Pankaj Raghav wrote: > > Hi all, > > > > Atomic (untorn) writes for Direct I/O have successfully landed in kernel > > for ext4 and XFS[1][2]. However, extending this support to Buffered I/O > > remains a contentious topic, with previous discussions often stalling due to > > concerns about complexity versus utility. > > > > Hi, > > Thanks a lot everyone for the input on this topic. I would like to > summarize some of the important points discussed here so that it could > be used as a reference for the talk and RFCs going forward: > > - There is a general consensus to add atomic support to buffered IO > path. I don't think that's quite true.