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([2620:10d:c092:600::1:4215]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-abf0c7c18a3sm139766066b.185.2025.02.27.07.53.33 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 27 Feb 2025 07:53:34 -0800 (PST) Message-ID: <844f45ac-e36e-4784-9f8d-528b022dff9c@gmail.com> Date: Thu, 27 Feb 2025 15:54:31 +0000 Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCHv7 2/6] io_uring: add support for kernel registered bvecs To: Keith Busch , ming.lei@redhat.com, axboe@kernel.dk, linux-block@vger.kernel.org, io-uring@vger.kernel.org Cc: bernd@bsbernd.com, csander@purestorage.com, linux-nvme@lists.infradead.org, Keith Busch References: <20250226182102.2631321-1-kbusch@meta.com> <20250226182102.2631321-3-kbusch@meta.com> Content-Language: en-US From: Pavel Begunkov In-Reply-To: <20250226182102.2631321-3-kbusch@meta.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 2/26/25 18:20, Keith Busch wrote: > From: Keith Busch > > Provide an interface for the kernel to leverage the existing > pre-registered buffers that io_uring provides. User space can reference > these later to achieve zero-copy IO. > > User space must register an empty fixed buffer table with io_uring in > order for the kernel to make use of it. Can you also fail rw.c:loop_rw_iter()? Something like: loop_rw_iter() { if ((req->flags & REQ_F_BUF_NODE) && req->buf_node->buf->release) return -EFAULT; } -- Pavel Begunkov