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([2600:1702:4eb1:8c10:3167:4d82:8858:3dfb]) by smtp.gmail.com with ESMTPSA id 46e09a7af769-7272b73b400sm2502437a34.65.2025.02.21.10.13.05 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 21 Feb 2025 10:13:06 -0800 (PST) Message-ID: <72ac0bc2-ff75-4efe-987e-5002b7687729@gmail.com> Date: Fri, 21 Feb 2025 12:13:04 -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 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> Content-Language: en-US From: Moinak Bhattacharyya In-Reply-To: <2d9f56ae-7344-4f82-b5da-61522543ef4f@bsbernd.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit 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.