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Mon, 3 Feb 2025 14:03:55 +0000 (GMT) Received: from epsmgmcp1.samsung.com (unknown [182.195.42.82]) by epsmtrp2.samsung.com (KnoxPortal) with ESMTP id 20250203140355epsmtrp262868bfe281810560d487e0ae97a3698~gt7LdpY7T2289522895epsmtrp2b; Mon, 3 Feb 2025 14:03:55 +0000 (GMT) X-AuditID: b6c32a49-3d20270000004e54-c9-67a0cccb6730 Received: from epsmtip1.samsung.com ( [182.195.34.30]) by epsmgmcp1.samsung.com (Symantec Messaging Gateway) with SMTP id 29.A0.33707.ACCC0A76; Mon, 3 Feb 2025 23:03:54 +0900 (KST) Received: from [107.122.11.51] (unknown [107.122.11.51]) by epsmtip1.samsung.com (KnoxPortal) with ESMTPA id 20250203140353epsmtip15aafa852148ac72e8e84f938bb4751eb~gt7J1A-Z81698316983epsmtip1i; Mon, 3 Feb 2025 14:03:53 +0000 (GMT) Message-ID: <330a257d-e276-40d2-855c-8d108abfde02@samsung.com> Date: Mon, 3 Feb 2025 19:33:52 +0530 Precedence: bulk X-Mailing-List: linux-btrfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC 0/3] Btrfs checksum offload To: Johannes Thumshirn , "josef@toxicpanda.com" , "dsterba@suse.com" , "clm@fb.com" , "axboe@kernel.dk" , "kbusch@kernel.org" , hch Cc: "linux-btrfs@vger.kernel.org" , "linux-nvme@lists.infradead.org" , "linux-block@vger.kernel.org" , "gost.dev@samsung.com" Content-Language: en-US From: Kanchan Joshi In-Reply-To: Content-Transfer-Encoding: 7bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrPJsWRmVeSWpSXmKPExsWy7bCmhu7pMwvSDW53iVmsvtvPZjGpfwa7 xYUfjUwWNw/sZLJYufook8XfrntMFn8eGlpMOnSN0WLvLW2LS49XsFvMX/aU3YHbY2LzO3aP y2dLPTat6mTz2Lyk3mP3zQY2j74tqxg91m+5yuIxYfNGVo/Pm+Q82g90MwVwRWXbZKQmpqQW KaTmJeenZOal2yp5B8c7x5uaGRjqGlpamCsp5CXmptoqufgE6Lpl5gDdq6RQlphTChQKSCwu VtK3synKLy1JVcjILy6xVUotSMkpMCnQK07MLS7NS9fLSy2xMjQwMDIFKkzIzjj5OaWgg6Vi 9szXjA2My5i7GDk5JARMJKY+eMzSxcjFISSwm1GiZcM1FpCEkMAnRomVHyMgEkD2mt29rDAd L14+YIVI7ATqWHmIGcJ5C1T1vYMNpIpXwE7i/bYOpi5GDg4WARWJQ/cqIMKCEidnPgHbICog L3H/1gz2LkZ2DmEBXYkd0SBTRAS6mCQOr1kONp9Z4AujxI/nR8AWMwuIS9x6Mh9sJJuApsSF yaUgJqeAtcSXxa4QFfIS29/OgXrsCIfE5UmmELaLxKZ9c5kgbGGJV8e3sEPYUhKf3+1lg7Cz JR48esACYddI7NjcB/WuvUTDnxusIKuYgbau36UPsYpPovf3E7BjJAR4JTrahCCqFSXuTXoK 1Sku8XDGEijbQ+LFhGNskHDqZJY4f7iNeQKjwiykMJmF5MdZSL6ZhbB5ASPLKkbJ1ILi3PTU YtMCw7zUcnhcJ+fnbmIEp2Qtzx2Mdx980DvEyMTBeIhRgoNZSYT39PYF6UK8KYmVValF+fFF pTmpxYcYTYFxM5FZSjQ5H5gV8kriDU0sDUzMzMxMLI3NDJXEeZt3tqQLCaQnlqRmp6YWpBbB 9DFxcEo1MK1Qyzb94OgRKKt230vt0qWnDRGhPz+9cNVsyWaxZF7DKGx3V7H5KL/J5YkOb9br b/zK0TK1w0Nmn7l8t3km72/3Tys1+FiOcIcUN+QJpDRePbqmsWfxw98nVFvjHLguTu5pL2f0 0JynUnI1e8q8G/vSvO1fs//IeH72GPO6AEvtlqjqGzIbuPa/eszj45HYL/J2bW9N19qDGRym Dv4HM7+9KZq6dG94a2r1nYc7boSrbWyZfmCKgI3z/HfNB3Rd9pi+fxG5ur5/hYGK2j+5tgsm pyoeRPBx6OpVves9Hc0oZNce3PllKvf5FTP+nym7Y2C/b1uVFE/y11syIp2yzw5+/R28lvOx t6tJl4K5EktxRqKhFnNRcSIAGudcC1IEAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprJIsWRmVeSWpSXmKPExsWy7bCSnO6pMwvSDX6vNbVYfbefzWJS/wx2 iws/Gpksbh7YyWSxcvVRJou/XfeYLP48NLSYdOgao8XeW9oWlx6vYLeYv+wpuwO3x8Tmd+we l8+Wemxa1cnmsXlJvcfumw1sHn1bVjF6rN9ylcVjwuaNrB6fN8l5tB/oZgrgiuKySUnNySxL LdK3S+DKOPk5paCDpWL2zNeMDYzLmLsYOTkkBEwkXrx8wNrFyMUhJLCdUWLrpaOMEAlxieZr P9ghbGGJlf+es0MUvWaUmHLnBVgRr4CdxPttHUxdjBwcLAIqEofuVUCEBSVOznzCAmKLCshL 3L81A6iXnUNYQFdiRzTIFBGBHiaJc+d3MYI4zAJfGCV2XrvKCDG/k1ni1sWfYIuZgY649WQ+ 2Hw2AU2JC5NLQUxOAWuJL4tdISrMJLq2djFC2PIS29/OYZ7AKDQLyRWzkAyahaRlFpKWBYws qxhFUwuKc9NzkwsM9YoTc4tL89L1kvNzNzGCY08raAfjsvV/9Q4xMnEwHmKU4GBWEuE9vX1B uhBvSmJlVWpRfnxRaU5q8SFGaQ4WJXFe5ZzOFCGB9MSS1OzU1ILUIpgsEwenVAOT662Ijsbv FaeCJFdyxSz94zx/hgXHM8Z/qbWrhLwX3uSXiL1RuX/D2jcids4pGiUVhn7CDPWnV+nt2aTj s8Ns5zrZY2k+HSUfPGpcTnQLrlqSEXf36dbF8x/ZtCs4+hu+FEwLVuxJ1lzefWvmGt/ff6Mr t7Ad3BTE4bxeWPam99UTL7M/PI5g2bZi5Zf410enrtgtw9Sn9cLZ6eXbdy3x7K0J7e4hU7+7 B2x0MbxzqPOx+LbN8f8X5C6USU8z6ShTmjn5euJ6xwRBN+ngV8fWmuhpRTJdNda0jMjZIH7t zLMjCXtFREybNgox6qj3bblRoWllekQj/q/IniceLSqLXTcUvI77tunAHwZBm+9KLMUZiYZa zEXFiQBLIVlgLAMAAA== X-CMS-MailID: 20250203140355epcas5p39624b1d4924f53e2c4cb9dd0188160ec X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" CMS-TYPE: 105P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20250129141039epcas5p11feb1be4124c0db3c5223325924183a3 References: <20250129140207.22718-1-joshi.k@samsung.com> <299a886d-c065-4b75-b0be-625710f7348c@wdc.com> <572e0418-de26-47ec-b536-b63291acff52@samsung.com> <73ba28f4-0588-4ca8-b64f-2a6dd593606b@wdc.com> <8e548c8f-7a05-4e82-aed7-6044a0d247c9@samsung.com> On 2/3/2025 7:10 PM, Johannes Thumshirn wrote: > But NODATASUM isn't something that is actively recommended unless you > know what you're doing. I thought of your patches as an offload of the > checksum tree to the T10-PI extended sector format You thought right, patches do "offload to T10-PI format" part. That part is generic for any upper-layer user. One only needs to send flag REQ_INTEGRITY_OFFLOAD for that. And for the other part "suppress data-csums at Btrfs level", I thought of using NODATASUM.