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([2600:1702:4eb1:8c10:3167:4d82:8858:3dfb]) by smtp.gmail.com with ESMTPSA id 006d021491bc7-5fd046ef5adsm1165647eaf.15.2025.02.21.10.14.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 21 Feb 2025 10:14:32 -0800 (PST) Message-ID: <36f0a3fe-5a5c-46f2-84ae-d08c0f68cea3@gmail.com> Date: Fri, 21 Feb 2025 12:14:30 -0600 Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Beta Subject: Re: [PATCH] Fuse: Add backing file support for uring_cmd From: Moinak Bhattacharyya To: Bernd Schubert , Amir Goldstein Cc: Miklos Szeredi , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, io-uring@vger.kernel.org References: <2d9f56ae-7344-4f82-b5da-61522543ef4f@bsbernd.com> <72ac0bc2-ff75-4efe-987e-5002b7687729@gmail.com> Content-Language: en-US In-Reply-To: <72ac0bc2-ff75-4efe-987e-5002b7687729@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit s/liburing/libfuse/ On 2/21/25 12:13 PM, Moinak Bhattacharyya wrote: > I don't have the modifications to libfuse. What tree are you using for > the uring modifications? I dont see any uring patches on the latest > master liburing. >>> It is possible, for example set FOPEN_PASSTHROUGH_FD to >>> interpret backing_id as backing_fd, but note that in the current >>> implementation of passthrough_hp, not every open does >>> fuse_passthrough_open(). >>> The non-first open of an inode uses a backing_id stashed in inode, >>> from the first open so we'd need different server logic depending on >>> the commands channel, which is not nice. > I wonder if we can just require URING registered FDs (using > IORING_REGISTER_FILES). I think io_uring does checks on the file > permissions when the FD is registered.