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Thu, 17 Jul 2025 05:01:51 -0700 (PDT) From: Jens Axboe To: agk@redhat.com, snitzer@kernel.org, mpatocka@redhat.com, song@kernel.org, yukuai3@huawei.com, hch@lst.de, nilay@linux.ibm.com, cem@kernel.org, John Garry Cc: dm-devel@lists.linux.dev, linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org, linux-block@vger.kernel.org, ojaswin@linux.ibm.com, martin.petersen@oracle.com, akpm@linux-foundation.org, linux-xfs@vger.kernel.org, djwong@kernel.org, dlemoal@kernel.org In-Reply-To: <20250711105258.3135198-1-john.g.garry@oracle.com> References: <20250711105258.3135198-1-john.g.garry@oracle.com> Subject: Re: [PATCH v7 0/6] block/md/dm: set chunk_sectors from stacked dev stripe size Message-Id: <175275371113.371765.7347642796595215334.b4-ty@kernel.dk> Date: Thu, 17 Jul 2025 06:01:51 -0600 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Mailer: b4 0.14.3-dev-2ce6c On Fri, 11 Jul 2025 10:52:52 +0000, John Garry wrote: > This value in io_min is used to configure any atomic write limit for the > stacked device. The idea is that the atomic write unit max is a > power-of-2 factor of the stripe size, and the stripe size is available > in io_min. > > Using io_min causes issues, as: > a. it may be mutated > b. the check for io_min being set for determining if we are dealing with > a striped device is hard to get right, as reported in [0]. > > [...] Applied, thanks! [1/6] ilog2: add max_pow_of_two_factor() commit: 6381061d82141909c382811978ccdd7566698bca [2/6] block: sanitize chunk_sectors for atomic write limits commit: 1de67e8e28fc47d71ee06ffa0185da549b378ffb [3/6] md/raid0: set chunk_sectors limit commit: 4b8beba60d324d259f5a1d1923aea2c205d17ebc [4/6] md/raid10: set chunk_sectors limit commit: 7ef50c4c6a9c36fa3ea6f1681a80c0bf9a797345 [5/6] dm-stripe: limit chunk_sectors to the stripe size commit: 5fb9d4341b782a80eefa0dc1664d131ac3c8885d [6/6] block: use chunk_sectors when evaluating stacked atomic write limits commit: 63d092d1c1b1f773232c67c87debe557aab5aca0 Best regards, -- Jens Axboe