From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-yw1-f172.google.com (mail-yw1-f172.google.com [209.85.128.172]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A77AB342CB6 for ; Tue, 24 Mar 2026 11:58:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774353533; cv=none; b=KkZfwB54dsSu/18pn4oUwJ3SlGtlwRGBfyj8QR0cdbqj3dElEX+G/llnbSweElLAf6JFsUGNUYtSx5GiJb7CfJSyLzrpyH0EofmyDHvfwD/uc0lY0H0bfZe0l2jUt53D+onyxYSmgJQIE4bhds1EihYAV44Q+F/TZlxXtKYgAxE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774353533; c=relaxed/simple; bh=6hsI6bjm93qF95umyykYvr5BUQ0g2fFGg7AhAzbraEY=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=o4Oc42/BBh2IHNGl/bEbrGmVucuZcnFvZeN+CVTGIpFcVuLiNcEabyN0iN+BSJKBKM7JjbWW3lqJBrCWssgjfjynUixO/k9X2DgLd7dF8Wna2AwnDLlZx76sDeY/miA9BwWlj86JfLQoig7KDTrRE7UiOUfGPWd8GqvQO0o3cFE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=iWWkMa+v; arc=none smtp.client-ip=209.85.128.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="iWWkMa+v" Received: by mail-yw1-f172.google.com with SMTP id 00721157ae682-79a2ee65171so37626347b3.2 for ; Tue, 24 Mar 2026 04:58:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1774353531; x=1774958331; darn=vger.kernel.org; h=in-reply-to:autocrypt:from:content-language:references:cc:to :subject:user-agent:mime-version:date:message-id:from:to:cc:subject :date:message-id:reply-to; bh=oBqGEMb6OlqwjNYFQlLA63lTssFfA1AyosQixg5yXi8=; b=iWWkMa+v4UmcCi1rJPwZaKWLkacue61IS6pL/UEzZLZxq5rBmYPuu5/8tDmpeMT1qN oerskPDAF0xMP9Sgz0fhhb8ZTanvboeADxA8FWRBqXt2D1GfzI+CeGyDOGVTJ2A+R+qz N3L0JFJ8nMvpCbeHcbgVxHfj9/UDESWPLYC3BuBsdqelhY3L/EUos+Qu6ZnVDeUImqAN WoXzFEpZYz8SHx9MYCVdStIuJ1m/Y4yAQs6tcTYXqjjj4eZh6NHBGGwyhFbYUIKiK8TX 2HnV+0bElgRihXkf7qiQiUKKhY8q0UpkpRzC2bQr893l6HHZifV1TEVK0AxqMqTvNU37 afLw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1774353531; x=1774958331; h=in-reply-to:autocrypt:from:content-language:references:cc:to :subject:user-agent:mime-version:date:message-id:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=oBqGEMb6OlqwjNYFQlLA63lTssFfA1AyosQixg5yXi8=; b=myvYXKaMOR+MaTniEB8zbfgL3pVLM/QecHf7o2qI732ebTIpxo9km2gngRBsOANUH4 tTRYcIpLr18MhmEhVpzpNau4izog7PRZ7iXaDRP7XbFB+63v/+a2JAWPIosCOYHaOTC8 ntPvqw2KzXFFXJOtE7RSIqye0OpZBNz6G+30vqdexVOedWjggC62CyGt4vqOPuJP7XdJ H490dwVQA1sXJEZAVE06HCZwll5LjLF73drM42Q54nUaewZ2rFxdCWtSRP1jwd+B5pP3 iDfTF9CPZnjjWqJ25XYW+z1oV++dGwrkbL56QVaMM4Tka2ZjfItZGllwMj09zeuq5ZHW FfnQ== X-Forwarded-Encrypted: i=1; AJvYcCUQMsHPjzd4zcU4gPSvpv2agEVxGC2qrS8iixdFaa0Kl/z/b7ptJqymBPMJ6Of3IGUdXSi9BslnbW7o5KR+@vger.kernel.org X-Gm-Message-State: AOJu0YwsCEjpDPnGkHHN2kY8WZwB66YQwyKTmVSAmRl50zm3kWnUL3jr 3mwyRkat8Xik0d/UppFLS9uYR0l0xlOx32MbJLpb5mw9f09B1fTwVAJ2 X-Gm-Gg: ATEYQzxhkl9vDNwpFwULDu/TzaQPiOtwOFr16oukOKk91ZzRprTTthe5Ci1slOcxBdH h7BSfFpR1F5E/XN7nVUHQ5qrZqyZiypSkDwv8wnuOwUKJJmm3S+va50ds6VPB9kLTeL3asdOO45 A9k17Vwur6CMC8i2jkuOSHqvPi+aWekeEdfVqMxNQp3N2dal8Oy0kFQzhT1olyTlIXPwEJ6o4HQ VMvzfY285jO2ehr1l5gi7+P/lxuTEh+8fQtaLOqEC/7Hc/WP6ZW/6pxbR3kr0d3ihq3NxoS+VQV liRVf6SjpXwO8ydagGNOCOA9j39ZhDm9a1HhaBoIm9+MgNnQwe22B7x2x69tFQPwcP43qCblQEP PZR4ilNnvqnVPEAZVL2WXfy+rDuvwe3tu/9JdA+chiCgaRaRXP0OTMVr313KUZhZxeZhghnk0i7 DFM+2hiYb5iOUYzJpp8HChmKVdbmHAHNhrqDjPBycyGU0kHq+v51MROjBGy1E1PHfz5XGoyhuf3 CHR0L/y3KFHkguwM5m1Kp1MJLNpJPDVaO7r2kjBd+dRTR5rLw== X-Received: by 2002:a05:690c:7107:b0:79a:ca70:a20b with SMTP id 00721157ae682-79aca70a7c7mr8071827b3.42.1774353530520; Tue, 24 Mar 2026 04:58:50 -0700 (PDT) Received: from [10.138.34.110] (h69-131-148-49.cncrtn.broadband.dynamic.tds.net. [69.131.148.49]) by smtp.gmail.com with ESMTPSA id 00721157ae682-79a905bf186sm71683647b3.48.2026.03.24.04.58.48 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 24 Mar 2026 04:58:49 -0700 (PDT) Message-ID: Date: Tue, 24 Mar 2026 07:58:36 -0400 Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [Lsf-pc] [LSF/MM/BPF TOPIC] Where is fuse going? API cleanup, restructuring and more To: Christian Brauner , Jan Kara Cc: Gao Xiang , "Darrick J. Wong" , Miklos Szeredi , linux-fsdevel@vger.kernel.org, Joanne Koong , John Groves , Bernd Schubert , Amir Goldstein , Luis Henriques , Horst Birthelmer , Gao Xiang , lsf-pc@lists.linux-foundation.org References: <361d312b-9706-45ca-8943-b655a75c765b@gmail.com> <390cd031-742b-4f1b-99c4-8ee41a259744@linux.alibaba.com> <72eaaed1-24a0-4c98-a7c0-ea249d541f2d@linux.alibaba.com> <9af9ad0e-8070-4aaa-9f64-7d72074bd948@linux.alibaba.com> <68116ee5-b1f7-484b-a520-7dc5aefd7738@linux.alibaba.com> <2gyfmxfnnxrglpzb7kz63xbve5vnosl6gi54c3umgrpwbjr4og@lz4e2ptqanfe> <20260324-hilfen-reibung-9783005d5d0f@brauner> Content-Language: en-US From: Demi Marie Obenour Autocrypt: addr=demiobenour@gmail.com; keydata= xsFNBFp+A0oBEADffj6anl9/BHhUSxGTICeVl2tob7hPDdhHNgPR4C8xlYt5q49yB+l2nipd aq+4Gk6FZfqC825TKl7eRpUjMriwle4r3R0ydSIGcy4M6eb0IcxmuPYfbWpr/si88QKgyGSV Z7GeNW1UnzTdhYHuFlk8dBSmB1fzhEYEk0RcJqg4AKoq6/3/UorR+FaSuVwT7rqzGrTlscnT DlPWgRzrQ3jssesI7sZLm82E3pJSgaUoCdCOlL7MMPCJwI8JpPlBedRpe9tfVyfu3euTPLPx wcV3L/cfWPGSL4PofBtB8NUU6QwYiQ9Hzx4xOyn67zW73/G0Q2vPPRst8LBDqlxLjbtx/WLR 6h3nBc3eyuZ+q62HS1pJ5EvUT1vjyJ1ySrqtUXWQ4XlZyoEFUfpJxJoN0A9HCxmHGVckzTRl 5FMWo8TCniHynNXsBtDQbabt7aNEOaAJdE7to0AH3T/Bvwzcp0ZJtBk0EM6YeMLtotUut7h2 Bkg1b//r6bTBswMBXVJ5H44Qf0+eKeUg7whSC9qpYOzzrm7+0r9F5u3qF8ZTx55TJc2g656C 9a1P1MYVysLvkLvS4H+crmxA/i08Tc1h+x9RRvqba4lSzZ6/Tmt60DPM5Sc4R0nSm9BBff0N m0bSNRS8InXdO1Aq3362QKX2NOwcL5YaStwODNyZUqF7izjK4QARAQABzTxEZW1pIE1hcmll IE9iZW5vdXIgKGxvdmVyIG9mIGNvZGluZykgPGRlbWlvYmVub3VyQGdtYWlsLmNvbT7CwXgE EwECACIFAlp+A0oCGwMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJELKItV//nCLBhr8Q AK/xrb4wyi71xII2hkFBpT59ObLN+32FQT7R3lbZRjVFjc6yMUjOb1H/hJVxx+yo5gsSj5LS 9AwggioUSrcUKldfA/PKKai2mzTlUDxTcF3vKx6iMXKA6AqwAw4B57ZEJoMM6egm57TV19kz PMc879NV2nc6+elaKl+/kbVeD3qvBuEwsTe2Do3HAAdrfUG/j9erwIk6gha/Hp9yZlCnPTX+ VK+xifQqt8RtMqS5R/S8z0msJMI/ajNU03kFjOpqrYziv6OZLJ5cuKb3bZU5aoaRQRDzkFIR 6aqtFLTohTo20QywXwRa39uFaOT/0YMpNyel0kdOszFOykTEGI2u+kja35g9TkH90kkBTG+a EWttIht0Hy6YFmwjcAxisSakBuHnHuMSOiyRQLu43ej2+mDWgItLZ48Mu0C3IG1seeQDjEYP tqvyZ6bGkf2Vj+L6wLoLLIhRZxQOedqArIk/Sb2SzQYuxN44IDRt+3ZcDqsPppoKcxSyd1Ny 2tpvjYJXlfKmOYLhTWs8nwlAlSHX/c/jz/ywwf7eSvGknToo1Y0VpRtoxMaKW1nvH0OeCSVJ itfRP7YbiRVc2aNqWPCSgtqHAuVraBRbAFLKh9d2rKFB3BmynTUpc1BQLJP8+D5oNyb8Ts4x Xd3iV/uD8JLGJfYZIR7oGWFLP4uZ3tkneDfYzsFNBFp+A0oBEAC9ynZI9LU+uJkMeEJeJyQ/ 8VFkCJQPQZEsIGzOTlPnwvVna0AS86n2Z+rK7R/usYs5iJCZ55/JISWd8xD57ue0eB47bcJv VqGlObI2DEG8TwaW0O0duRhDgzMEL4t1KdRAepIESBEA/iPpI4gfUbVEIEQuqdqQyO4GAe+M kD0Hy5JH/0qgFmbaSegNTdQg5iqYjRZ3ttiswalql1/iSyv1WYeC1OAs+2BLOAT2NEggSiVO txEfgewsQtCWi8H1SoirakIfo45Hz0tk/Ad9ZWh2PvOGt97Ka85o4TLJxgJJqGEnqcFUZnJJ riwoaRIS8N2C8/nEM53jb1sH0gYddMU3QxY7dYNLIUrRKQeNkF30dK7V6JRH7pleRlf+wQcN fRAIUrNlatj9TxwivQrKnC9aIFFHEy/0mAgtrQShcMRmMgVlRoOA5B8RTulRLCmkafvwuhs6 dCxN0GNAORIVVFxjx9Vn7OqYPgwiofZ6SbEl0hgPyWBQvE85klFLZLoj7p+joDY1XNQztmfA rnJ9x+YV4igjWImINAZSlmEcYtd+xy3Li/8oeYDAqrsnrOjb+WvGhCykJk4urBog2LNtcyCj kTs7F+WeXGUo0NDhbd3Z6AyFfqeF7uJ3D5hlpX2nI9no/ugPrrTVoVZAgrrnNz0iZG2DVx46 x913pVKHl5mlYQARAQABwsFfBBgBAgAJBQJafgNKAhsMAAoJELKItV//nCLBwNIP/AiIHE8b oIqReFQyaMzxq6lE4YZCZNj65B/nkDOvodSiwfwjjVVE2V3iEzxMHbgyTCGA67+Bo/d5aQGj gn0TPtsGzelyQHipaUzEyrsceUGWYoKXYyVWKEfyh0cDfnd9diAm3VeNqchtcMpoehETH8fr RHnJdBcjf112PzQSdKC6kqU0Q196c4Vp5HDOQfNiDnTf7gZSj0BraHOByy9LEDCLhQiCmr+2 E0rW4tBtDAn2HkT9uf32ZGqJCn1O+2uVfFhGu6vPE5qkqrbSE8TG+03H8ecU2q50zgHWPdHM OBvy3EhzfAh2VmOSTcRK+tSUe/u3wdLRDPwv/DTzGI36Kgky9MsDC5gpIwNbOJP2G/q1wT1o Gkw4IXfWv2ufWiXqJ+k7HEi2N1sree7Dy9KBCqb+ca1vFhYPDJfhP75I/VnzHVssZ/rYZ9+5 1yDoUABoNdJNSGUYl+Yh9Pw9pE3Kt4EFzUlFZWbE4xKL/NPno+z4J9aWemLLszcYz/u3XnbO vUSQHSrmfOzX3cV4yfmjM5lewgSstoxGyTx2M8enslgdXhPthZlDnTnOT+C+OTsh8+m5tos8 HQjaPM01MKBiAqdPgksm1wu2DrrwUi6ChRVTUBcj6+/9IJ81H2P2gJk3Ls3AVIxIffLoY34E +MYSfkEjBz0E8CLOcAw7JIwAaeBT In-Reply-To: <20260324-hilfen-reibung-9783005d5d0f@brauner> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------MqhhBr3T509YMAcjxaB76F16" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------MqhhBr3T509YMAcjxaB76F16 Content-Type: multipart/mixed; boundary="------------oXrZIS3O6myBBPHEGuHTZfBm"; protected-headers="v1" Message-ID: Date: Tue, 24 Mar 2026 07:58:36 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [Lsf-pc] [LSF/MM/BPF TOPIC] Where is fuse going? API cleanup, restructuring and more To: Christian Brauner , Jan Kara Cc: Gao Xiang , "Darrick J. Wong" , Miklos Szeredi , linux-fsdevel@vger.kernel.org, Joanne Koong , John Groves , Bernd Schubert , Amir Goldstein , Luis Henriques , Horst Birthelmer , Gao Xiang , lsf-pc@lists.linux-foundation.org References: <361d312b-9706-45ca-8943-b655a75c765b@gmail.com> <390cd031-742b-4f1b-99c4-8ee41a259744@linux.alibaba.com> <72eaaed1-24a0-4c98-a7c0-ea249d541f2d@linux.alibaba.com> <9af9ad0e-8070-4aaa-9f64-7d72074bd948@linux.alibaba.com> <68116ee5-b1f7-484b-a520-7dc5aefd7738@linux.alibaba.com> <2gyfmxfnnxrglpzb7kz63xbve5vnosl6gi54c3umgrpwbjr4og@lz4e2ptqanfe> <20260324-hilfen-reibung-9783005d5d0f@brauner> Content-Language: en-US From: Demi Marie Obenour Autocrypt: addr=demiobenour@gmail.com; keydata= xsFNBFp+A0oBEADffj6anl9/BHhUSxGTICeVl2tob7hPDdhHNgPR4C8xlYt5q49yB+l2nipd aq+4Gk6FZfqC825TKl7eRpUjMriwle4r3R0ydSIGcy4M6eb0IcxmuPYfbWpr/si88QKgyGSV Z7GeNW1UnzTdhYHuFlk8dBSmB1fzhEYEk0RcJqg4AKoq6/3/UorR+FaSuVwT7rqzGrTlscnT DlPWgRzrQ3jssesI7sZLm82E3pJSgaUoCdCOlL7MMPCJwI8JpPlBedRpe9tfVyfu3euTPLPx wcV3L/cfWPGSL4PofBtB8NUU6QwYiQ9Hzx4xOyn67zW73/G0Q2vPPRst8LBDqlxLjbtx/WLR 6h3nBc3eyuZ+q62HS1pJ5EvUT1vjyJ1ySrqtUXWQ4XlZyoEFUfpJxJoN0A9HCxmHGVckzTRl 5FMWo8TCniHynNXsBtDQbabt7aNEOaAJdE7to0AH3T/Bvwzcp0ZJtBk0EM6YeMLtotUut7h2 Bkg1b//r6bTBswMBXVJ5H44Qf0+eKeUg7whSC9qpYOzzrm7+0r9F5u3qF8ZTx55TJc2g656C 9a1P1MYVysLvkLvS4H+crmxA/i08Tc1h+x9RRvqba4lSzZ6/Tmt60DPM5Sc4R0nSm9BBff0N m0bSNRS8InXdO1Aq3362QKX2NOwcL5YaStwODNyZUqF7izjK4QARAQABzTxEZW1pIE1hcmll IE9iZW5vdXIgKGxvdmVyIG9mIGNvZGluZykgPGRlbWlvYmVub3VyQGdtYWlsLmNvbT7CwXgE EwECACIFAlp+A0oCGwMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJELKItV//nCLBhr8Q AK/xrb4wyi71xII2hkFBpT59ObLN+32FQT7R3lbZRjVFjc6yMUjOb1H/hJVxx+yo5gsSj5LS 9AwggioUSrcUKldfA/PKKai2mzTlUDxTcF3vKx6iMXKA6AqwAw4B57ZEJoMM6egm57TV19kz PMc879NV2nc6+elaKl+/kbVeD3qvBuEwsTe2Do3HAAdrfUG/j9erwIk6gha/Hp9yZlCnPTX+ VK+xifQqt8RtMqS5R/S8z0msJMI/ajNU03kFjOpqrYziv6OZLJ5cuKb3bZU5aoaRQRDzkFIR 6aqtFLTohTo20QywXwRa39uFaOT/0YMpNyel0kdOszFOykTEGI2u+kja35g9TkH90kkBTG+a EWttIht0Hy6YFmwjcAxisSakBuHnHuMSOiyRQLu43ej2+mDWgItLZ48Mu0C3IG1seeQDjEYP tqvyZ6bGkf2Vj+L6wLoLLIhRZxQOedqArIk/Sb2SzQYuxN44IDRt+3ZcDqsPppoKcxSyd1Ny 2tpvjYJXlfKmOYLhTWs8nwlAlSHX/c/jz/ywwf7eSvGknToo1Y0VpRtoxMaKW1nvH0OeCSVJ itfRP7YbiRVc2aNqWPCSgtqHAuVraBRbAFLKh9d2rKFB3BmynTUpc1BQLJP8+D5oNyb8Ts4x Xd3iV/uD8JLGJfYZIR7oGWFLP4uZ3tkneDfYzsFNBFp+A0oBEAC9ynZI9LU+uJkMeEJeJyQ/ 8VFkCJQPQZEsIGzOTlPnwvVna0AS86n2Z+rK7R/usYs5iJCZ55/JISWd8xD57ue0eB47bcJv VqGlObI2DEG8TwaW0O0duRhDgzMEL4t1KdRAepIESBEA/iPpI4gfUbVEIEQuqdqQyO4GAe+M kD0Hy5JH/0qgFmbaSegNTdQg5iqYjRZ3ttiswalql1/iSyv1WYeC1OAs+2BLOAT2NEggSiVO txEfgewsQtCWi8H1SoirakIfo45Hz0tk/Ad9ZWh2PvOGt97Ka85o4TLJxgJJqGEnqcFUZnJJ riwoaRIS8N2C8/nEM53jb1sH0gYddMU3QxY7dYNLIUrRKQeNkF30dK7V6JRH7pleRlf+wQcN fRAIUrNlatj9TxwivQrKnC9aIFFHEy/0mAgtrQShcMRmMgVlRoOA5B8RTulRLCmkafvwuhs6 dCxN0GNAORIVVFxjx9Vn7OqYPgwiofZ6SbEl0hgPyWBQvE85klFLZLoj7p+joDY1XNQztmfA rnJ9x+YV4igjWImINAZSlmEcYtd+xy3Li/8oeYDAqrsnrOjb+WvGhCykJk4urBog2LNtcyCj kTs7F+WeXGUo0NDhbd3Z6AyFfqeF7uJ3D5hlpX2nI9no/ugPrrTVoVZAgrrnNz0iZG2DVx46 x913pVKHl5mlYQARAQABwsFfBBgBAgAJBQJafgNKAhsMAAoJELKItV//nCLBwNIP/AiIHE8b oIqReFQyaMzxq6lE4YZCZNj65B/nkDOvodSiwfwjjVVE2V3iEzxMHbgyTCGA67+Bo/d5aQGj gn0TPtsGzelyQHipaUzEyrsceUGWYoKXYyVWKEfyh0cDfnd9diAm3VeNqchtcMpoehETH8fr RHnJdBcjf112PzQSdKC6kqU0Q196c4Vp5HDOQfNiDnTf7gZSj0BraHOByy9LEDCLhQiCmr+2 E0rW4tBtDAn2HkT9uf32ZGqJCn1O+2uVfFhGu6vPE5qkqrbSE8TG+03H8ecU2q50zgHWPdHM OBvy3EhzfAh2VmOSTcRK+tSUe/u3wdLRDPwv/DTzGI36Kgky9MsDC5gpIwNbOJP2G/q1wT1o Gkw4IXfWv2ufWiXqJ+k7HEi2N1sree7Dy9KBCqb+ca1vFhYPDJfhP75I/VnzHVssZ/rYZ9+5 1yDoUABoNdJNSGUYl+Yh9Pw9pE3Kt4EFzUlFZWbE4xKL/NPno+z4J9aWemLLszcYz/u3XnbO vUSQHSrmfOzX3cV4yfmjM5lewgSstoxGyTx2M8enslgdXhPthZlDnTnOT+C+OTsh8+m5tos8 HQjaPM01MKBiAqdPgksm1wu2DrrwUi6ChRVTUBcj6+/9IJ81H2P2gJk3Ls3AVIxIffLoY34E +MYSfkEjBz0E8CLOcAw7JIwAaeBT In-Reply-To: <20260324-hilfen-reibung-9783005d5d0f@brauner> --------------oXrZIS3O6myBBPHEGuHTZfBm Content-Type: multipart/mixed; boundary="------------tkti2FFfqX3tafTkJwo7MMUT" --------------tkti2FFfqX3tafTkJwo7MMUT Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 3/24/26 04:48, Christian Brauner wrote: > On Mon, Mar 23, 2026 at 03:47:24PM +0100, Jan Kara wrote: >> On Mon 23-03-26 22:36:46, Gao Xiang wrote: >>> On 2026/3/23 22:13, Jan Kara wrote: >>>>>> think that is the corner cases if you don't claim the >>>>>> limitation of FUSE approaches. >>>>>> >>>>>> If none expects that, that is absolute be fine, as I said, >>>>>> it provides strong isolation and stability, but I really >>>>>> suspect this approach could be abused to mount totally >>>>>> untrusted remote filesystems (Actually as I said, some >>>>>> business of ours already did: fetching EXT4 filesystems >>>>>> with unknown status and mount without fscking, that is >>>>>> really disappointing.) >>>> >>>> Yes, someone downloading untrusted ext4 image, mounting in read-writ= e and >>>> using it for sensitive application, that falls to "insane" category = for me >>>> :) We agree on that. And I agree that depending on the application u= sing >>>> FUSE to access such filesystem needn't be safe enough and immutable = fs + >>>> overlayfs writeable layer may provide better guarantees about fs beh= avior. >>> >>> That is my overall goal, I just want to make it clear >>> the difference out of write isolation, but of course, >>> "secure" or not is relative, and according to the >>> system design. >>> >>> If isolation and system stability are enough for >>> a system and can be called "secure", yes, they are >>> both the same in such aspects. >>> >>>> I would still consider such design highly suspicious but without mor= e >>>> detailed knowledge about the application I cannot say it's outright = broken >>>> :). >>> >>> What do you mean "such design"? "Writable untrusted >>> remote EXT4 images mounting on the host"? Really, we have >>> such applications for containers for many years but I don't >>> want to name it here, but I'm totally exhaused by such >>> usage (since I explained many many times, and they even >>> never bother with LWN.net) and the internal team. >> >> By "such design" I meant generally the concept that you fetch filesyst= em >> images (regardless whether ext4 or some other type) from untrusted sou= rce. >> Unless you do cryptographical verification of the data, you never know= what >> kind of garbage your application is processing which is always invitat= ion >> for nasty exploits and bugs... >=20 > If this is another 500 mail discussion about FS_USERNS_MOUNT on > block-backed filesystems then my verdict still stands that the only > condition under which I will let the VFS allow this if the underlying > device is signed and dm-verity protected. The kernel will continue to > refuse unprivileged policy in general and specifically based on quality= > or implementation of the underlying filesystem driver. As far as I can tell, the main problems are: 1. Most filesystems can only be run in kernel mode, so one needs a VM and an expensive RPC protocol if one wants to run them in a sandboxed environment. 2. Context switch overhead is so high that running filesystems entirely in userspace, without some form of in-kernel I/O acceleration, is a performance problem. 3. Filesystems are written in C and not designed to be secure against malicious on-disk images. Gao Xiang is working on problem for EROFS. FUSE iomap support solves 2. lklfuse solves problem 1. --=20 Sincerely, Demi Marie Obenour (she/her/hers) --------------tkti2FFfqX3tafTkJwo7MMUT Content-Type: application/pgp-keys; name="OpenPGP_0xB288B55FFF9C22C1.asc" Content-Disposition: attachment; filename="OpenPGP_0xB288B55FFF9C22C1.asc" Content-Description: OpenPGP public key Content-Transfer-Encoding: quoted-printable -----BEGIN PGP PUBLIC KEY BLOCK----- xsFNBFp+A0oBEADffj6anl9/BHhUSxGTICeVl2tob7hPDdhHNgPR4C8xlYt5q49y B+l2nipdaq+4Gk6FZfqC825TKl7eRpUjMriwle4r3R0ydSIGcy4M6eb0IcxmuPYf bWpr/si88QKgyGSVZ7GeNW1UnzTdhYHuFlk8dBSmB1fzhEYEk0RcJqg4AKoq6/3/ UorR+FaSuVwT7rqzGrTlscnTDlPWgRzrQ3jssesI7sZLm82E3pJSgaUoCdCOlL7M MPCJwI8JpPlBedRpe9tfVyfu3euTPLPxwcV3L/cfWPGSL4PofBtB8NUU6QwYiQ9H zx4xOyn67zW73/G0Q2vPPRst8LBDqlxLjbtx/WLR6h3nBc3eyuZ+q62HS1pJ5EvU T1vjyJ1ySrqtUXWQ4XlZyoEFUfpJxJoN0A9HCxmHGVckzTRl5FMWo8TCniHynNXs BtDQbabt7aNEOaAJdE7to0AH3T/Bvwzcp0ZJtBk0EM6YeMLtotUut7h2Bkg1b//r 6bTBswMBXVJ5H44Qf0+eKeUg7whSC9qpYOzzrm7+0r9F5u3qF8ZTx55TJc2g656C 9a1P1MYVysLvkLvS4H+crmxA/i08Tc1h+x9RRvqba4lSzZ6/Tmt60DPM5Sc4R0nS m9BBff0Nm0bSNRS8InXdO1Aq3362QKX2NOwcL5YaStwODNyZUqF7izjK4QARAQAB zTxEZW1pIE9iZW5vdXIgKElUTCBFbWFpbCBLZXkpIDxhdGhlbmFAaW52aXNpYmxl dGhpbmdzbGFiLmNvbT7CwY4EEwEIADgWIQR2h02fEza6IlkHHHGyiLVf/5wiwQUC X6YJvQIbAwULCQgHAgYVCgkICwIEFgIDAQIeAQIXgAAKCRCyiLVf/5wiwWRhD/0Y R+YYC5Kduv/2LBgQJIygMsFiRHbR4+tWXuTFqgrxxFSlMktZ6gQrQCWe38WnOXkB oY6n/5lSJdfnuGd2UagZ/9dkaGMUkqt+5WshLFly4BnP7pSsWReKgMP7etRTwn3S zk1OwFx2lzY1EnnconPLfPBc6rWG2moA6l0WX+3WNR1B1ndqpl2hPSjT2jUCBWDV rGOUSX7r5f1WgtBeNYnEXPBCUUM51pFGESmfHIXQrqFDA7nBNiIVFDJTmQzuEqIy Jl67pKNgooij5mKzRhFKHfjLRAH4mmWZlB9UjDStAfFBAoDFHwd1HL5VQCNQdqEc /9lZDApqWuCPadZN+pGouqLysesIYsNxUhJ7dtWOWHl0vs7/3qkWmWun/2uOJMQh ra2u8nA9g91FbOobWqjrDd6x3ZJoGQf4zLqjmn/P514gb697788e573WN/MpQ5XI Fl7aM2d6/GJiq6LC9T2gSUW4rbPBiqOCeiUx7Kd/sVm41p9TOA7fEG4bYddCfDsN xaQJH6VRK3NOuBUGeL+iQEVF5Xs6Yp+U+jwvv2M5Lel3EqAYo5xXTx4ls0xaxDCu fudcAh8CMMqx3fguSb7Mi31WlnZpk0fDuWQVNKyDP7lYpwc4nCCGNKCj622ZSocH AcQmX28L8pJdLYacv9pU3jPy4fHcQYvmTavTqowGnM08RGVtaSBNYXJpZSBPYmVu b3VyIChsb3ZlciBvZiBjb2RpbmcpIDxkZW1pb2Jlbm91ckBnbWFpbC5jb20+wsF4 BBMBAgAiBQJafgNKAhsDBgsJCAcDAgYVCAIJCgsEFgIDAQIeAQIXgAAKCRCyiLVf /5wiwYa/EACv8a2+MMou9cSCNoZBQaU+fTmyzft9hUE+0d5W2UY1RY3OsjFIzm9R /4SVccfsqOYLEo+S0vQMIIIqFEq3FCpXXwPzyimotps05VA8U3Bd7yseojFygOgK sAMOAee2RCaDDOnoJue01dfZMzzHPO/TVdp3OvnpWipfv5G1Xg96rwbhMLE3tg6N xwAHa31Bv4/Xq8CJOoIWvx6fcmZQpz01/lSvsYn0KrfEbTKkuUf0vM9JrCTCP2oz VNN5BYzqaq2M4r+jmSyeXLim922VOWqGkUEQ85BSEemqrRS06IU6NtEMsF8EWt/b hWjk/9GDKTcnpdJHTrMxTspExBiNrvpI2t+YPU5B/dJJAUxvmhFrbSIbdB8umBZs I3AMYrEmpAbh5x7jEjoskUC7uN3o9vpg1oCLS2ePDLtAtyBtbHnkA4xGD7ar8mem xpH9lY/i+sC6CyyIUWcUDnnagKyJP0m9ks0GLsTeOCA0bft2XA6rD6aaCnMUsndT ctrab42CV5XypjmC4U1rPJ8JQJUh1/3P48/8sMH+3krxpJ06KNWNFaUbaMTGiltZ 7x9DngklSYrX0T+2G4kVXNmjaljwkoLahwLla2gUWwBSyofXdqyhQdwZsp01KXNQ UCyT/Pg+aDcm/E7OMV3d4lf7g/CSxiX2GSEe6BlhSz+Lmd7ZJ3g32M1ARGVtaSBN YXJpZSBPYmVub3VyIChJVEwgRW1haWwgS2V5KSA8ZGVtaUBpbnZpc2libGV0aGlu Z3NsYWIuY29tPsLBjgQTAQgAOBYhBHaHTZ8TNroiWQcccbKItV//nCLBBQJgOEV+ AhsDBQsJCAcCBhUKCQgLAgQWAgMBAh4BAheAAAoJELKItV//nCLBKwoP/1WSnFdv SAD0g7fD0WlF+oi7ISFT7oqJnchFLOwVHK4Jg0e4hGn1ekWsF3Ha5tFLh4V/7UUu obYJpTfBAA2CckspYBqLtKGjFxcaqjjpO1I2W/jeNELVtSYuCOZICjdNGw2Hl9yH KRZiBkqc9u8lQcHDZKq4LIpVJj6ZQV/nxttDX90ax2No1nLLQXFbr5wb465LAPpU lXwunYDij7xJGye+VUASQh9datye6orZYuJvNo8Tr3mAQxxkfR46LzWgxFCPEAZJ 5P56Nc0IMHdJZj0Uc9+1jxERhOGppp5jlLgYGK7faGB/jTV6LaRQ4Ad+xiqokDWp mUOZsmA+bMbtPfYjDZBz5mlyHcIRKIFpE1l3Y8F7PhJuzzMUKkJi90CYakCV4x/a Zs4pzk5E96c2VQx01RIEJ7fzHF7lwFdtfTS4YsLtAbQFsKayqwkGcVv2B1AHeqdo TMX+cgDvjd1ZganGlWA8Sv9RkNSMchn1hMuTwERTyFTr2dKPnQdA1F480+jUap41 ClXgn227WkCIMrNhQGNyJsnwyzi5wS8rBVRQ3BOTMyvGM07j3axUOYaejEpg7wKi wTPZGLGH1sz5GljD/916v5+v2xLbOo5606j9dWf5/tAhbPuqrQgWv41wuKDi+dDD EKkODF7DHes8No+QcHTDyETMn1RYm7t0RKR4zsFNBFp+A0oBEAC9ynZI9LU+uJkM eEJeJyQ/8VFkCJQPQZEsIGzOTlPnwvVna0AS86n2Z+rK7R/usYs5iJCZ55/JISWd 8xD57ue0eB47bcJvVqGlObI2DEG8TwaW0O0duRhDgzMEL4t1KdRAepIESBEA/iPp I4gfUbVEIEQuqdqQyO4GAe+MkD0Hy5JH/0qgFmbaSegNTdQg5iqYjRZ3ttiswalq l1/iSyv1WYeC1OAs+2BLOAT2NEggSiVOtxEfgewsQtCWi8H1SoirakIfo45Hz0tk /Ad9ZWh2PvOGt97Ka85o4TLJxgJJqGEnqcFUZnJJriwoaRIS8N2C8/nEM53jb1sH 0gYddMU3QxY7dYNLIUrRKQeNkF30dK7V6JRH7pleRlf+wQcNfRAIUrNlatj9Txwi vQrKnC9aIFFHEy/0mAgtrQShcMRmMgVlRoOA5B8RTulRLCmkafvwuhs6dCxN0GNA ORIVVFxjx9Vn7OqYPgwiofZ6SbEl0hgPyWBQvE85klFLZLoj7p+joDY1XNQztmfA rnJ9x+YV4igjWImINAZSlmEcYtd+xy3Li/8oeYDAqrsnrOjb+WvGhCykJk4urBog 2LNtcyCjkTs7F+WeXGUo0NDhbd3Z6AyFfqeF7uJ3D5hlpX2nI9no/ugPrrTVoVZA grrnNz0iZG2DVx46x913pVKHl5mlYQARAQABwsFfBBgBAgAJBQJafgNKAhsMAAoJ ELKItV//nCLBwNIP/AiIHE8boIqReFQyaMzxq6lE4YZCZNj65B/nkDOvodSiwfwj jVVE2V3iEzxMHbgyTCGA67+Bo/d5aQGjgn0TPtsGzelyQHipaUzEyrsceUGWYoKX YyVWKEfyh0cDfnd9diAm3VeNqchtcMpoehETH8frRHnJdBcjf112PzQSdKC6kqU0 Q196c4Vp5HDOQfNiDnTf7gZSj0BraHOByy9LEDCLhQiCmr+2E0rW4tBtDAn2HkT9 uf32ZGqJCn1O+2uVfFhGu6vPE5qkqrbSE8TG+03H8ecU2q50zgHWPdHMOBvy3Ehz fAh2VmOSTcRK+tSUe/u3wdLRDPwv/DTzGI36Kgky9MsDC5gpIwNbOJP2G/q1wT1o Gkw4IXfWv2ufWiXqJ+k7HEi2N1sree7Dy9KBCqb+ca1vFhYPDJfhP75I/VnzHVss Z/rYZ9+51yDoUABoNdJNSGUYl+Yh9Pw9pE3Kt4EFzUlFZWbE4xKL/NPno+z4J9aW emLLszcYz/u3XnbOvUSQHSrmfOzX3cV4yfmjM5lewgSstoxGyTx2M8enslgdXhPt hZlDnTnOT+C+OTsh8+m5tos8HQjaPM01MKBiAqdPgksm1wu2DrrwUi6ChRVTUBcj 6+/9IJ81H2P2gJk3Ls3AVIxIffLoY34E+MYSfkEjBz0E8CLOcAw7JIwAaeBTzsFN BGbyLVgBEACqClxh50hmBepTSVlan6EBq3OAoxhrAhWZYEwN78k+ENhK68KhqC5R IsHzlL7QHW1gmfVBQZ63GnWiraM6wOJqFTL4ZWvRslga9u28FJ5XyK860mZLgYhK 9BzoUk4s+dat9jVUbq6LpQ1Ot5I9vrdzo2p1jtQ8h9WCIiFxSYy8s8pZ3hHh5T64 GIj1m/kY7lG3VIdUgoNiREGf/iOMjUFjwwE9ZoJ26j9p7p1U+TkKeF6wgswEB1T3 J8KCAtvmRtqJDq558IU5jhg5fgN+xHB8cgvUWulgK9FIF9oFxcuxtaf/juhHWKMO RtL0bHfNdXoBdpUDZE+mLBUAxF6KSsRrvx6AQyJs7VjgXJDtQVWvH0PUmTrEswgb 49nNU+dLLZQAZagxqnZ9Dp5l6GqaGZCHERJcLmdY/EmMzSf5YazJ6c0vO8rdW27M kn73qcWAplQn5mOXaqbfzWkAUPyUXppuRHfrjxTDz3GyJJVOeMmMrTxH4uCaGpOX Z8tN6829J1roGw4oKDRUQsaBAeEDqizXMPRc+6U9vI5FXzbAsb+8lKW65G7JWHym YPOGUt2hK4DdTA1PmVo0DxH00eWWeKxqvmGyX+Dhcg+5e191rPsMRGsDlH6KihI6 +3JIuc0y6ngdjcp6aalbuvPIGFrCRx3tnRtNc7He6cBWQoH9RPwluwARAQABwsOs BBgBCgAgFiEEdodNnxM2uiJZBxxxsoi1X/+cIsEFAmbyLVgCGwICQAkQsoi1X/+c IsHBdCAEGQEKAB0WIQSilC2pUlbVp66j3+yzNoc6synyUwUCZvItWAAKCRCzNoc6 synyU85gD/0T1QDtPhovkGwoqv4jUbEMMvpeYQf+oWgm/TjWPeLwdjl7AtY0G9Ml ZoyGniYkoHi37Gnn/ShLT3B5vtyI58ap2+SSa8SnGftdAKRLiWFWCiAEklm9FRk8 N3hwxhmSFF1KR/AIDS4g+HIsZn7YEMubBSgLlZZ9zHl4O4vwuXlREBEW97iL/FSt VownU2V39t7PtFvGZNk+DJH7eLO3jmNRYB0PL4JOyyda3NH/J92iwrFmjFWWmmWb /Xz8l9DIs+Z59pRCVTTwbBEZhcUc7rVMCcIYL+q1WxBG2e6lMn15OQJ5WfiE6E0I sGirAEDnXWx92JNGx5l+mMpdpsWhBZ5iGTtttZesibNkQfd48/eCgFi4cxJUC4PT UQwfD9AMgzwSTGJrkI5XGy+XqxwOjL8UA0iIrtTpMh49zw46uV6kwFQCgkf32jZM OLwLTNSzclbnA7GRd8tKwezQ/XqeK3dal2n+cOr+o+Eka7yGmGWNUqFbIe8cjj9T JeF3mgOCmZOwMI+wIcQYRSf+e5VTMO6TNWH5BI3vqeHSt7HkYuPlHT0pGum88d4a pWqhulH4rUhEMtirX1hYx8Q4HlUOQqLtxzmwOYWkhl1C+yPObAvUDNiHCLf9w28n uihgEkzHt9J4VKYulyJM9fe3ENcyU6rpXD7iANQqcr87ogKXFxknZ97uEACvSucc RbnnAgRqZ7GDzgoBerJ2zrmhLkeREZ08iz1zze1JgyW3HEwdr2UbyAuqvSADCSUU GN0vtQHsPzWl8onRc7lOPqPDF8OO+UfN9NAfA4wl3QyChD1GXl9rwKQOkbvdlYFV UFx9u86LNi4ssTmU8p9NtHIGpz1SYMVYNoYy9NU7EVqypGMguDCL7gJt6GUmA0sw p+YCroXiwL2BJ7RwRqTpgQuFL1gShkA17D5jK4mDPEetq1d8kz9rQYvAR/sTKBsR ImC3xSfn8zpWoNTTB6lnwyP5Ng1bu6esS7+SpYprFTe7ZqGZF6xhvBPf1Ldi9UAm U2xPN1/eeWxEa2kusidmFKPmN8lcT4miiAvwGxEnY7Oww9CgZlUB+LP4dl5VPjEt sFeAhrgxLdpVTjPRRwTd9VQF3/XYl83j5wySIQKIPXgT3sG3ngAhDhC8I8GpM36r 8WJJ3x2yVzyJUbBPO0GBhWE2xPNIfhxVoU4cGGhpFqz7dPKSTRDGq++MrFgKKGpI ZwT3CPTSSKc7ySndEXWkOYArDIdtyxdE1p5/c3aoz4utzUU7NDHQ+vVIwlnZSMiZ jek2IJP3SZ+COOIHCVxpUaZ4lnzWT4eDqABhMLpIzw6NmGfg+kLBJhouqz81WITr EtJuZYM5blWncBOJCoWMnBEcTEo/viU3GgcVRw=3D=3D =3Dx94R -----END PGP PUBLIC KEY BLOCK----- --------------tkti2FFfqX3tafTkJwo7MMUT-- --------------oXrZIS3O6myBBPHEGuHTZfBm-- --------------MqhhBr3T509YMAcjxaB76F16 Content-Type: application/pgp-signature; name="OpenPGP_signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="OpenPGP_signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEopQtqVJW1aeuo9/sszaHOrMp8lMFAmnCfGwACgkQszaHOrMp 8lPK+Q/+MXKVb/sp2CebekkMI6+ypdRGmbc6k1lACko/GUBBTrw3PwccRKj2et2/ Swi9yUFFkGlvhb6xK3j4ytxN+eTWJgUwagVA7R398x93CTkncsPxZ2dKl/1G9fEP VOa6D3MBOKFCktfpMD/ufyrkmO8iHFTDIpw+YxUOn+aFmmKaRtynIGwHaMUyZAhZ SKzA6QdxwXT3A/RZ1wXafJT4IpDt/CNSoClcFJO9pFW862CaAKuRse+Hf3XxqXph qrKYKxjyPKjpZOcaLapHOdf7My4GWsC4QSJQXh0YGwnsvmX+SAz74UgmlLAnqA+y 5cs8WcNjaf2ail+pfS4soJQpGpPinrnbCoI5ZU1tH/Uiu0TOgURjGWEFPMhm4a7u PR1tRZRVAu/50OTus4QwgW3G7qN35XJ+cWWgAHF4q6CbXXlXeEc2ghPSEQe7KkVj XDJI87R0VGN04I0IWa1TSwEFv6mHXjL9HgLptd71hwJubDztUb55Hb2CJ/zDO4QX AoO42vaV/lVETQrLINH/MpSLBB8QkLuPJIxjiwg3F7UhyAgCrmpNIyHyiGApGTFR HsmLTlzG+NcGcd6aEpGHJ7OZGJ3QcGK4vzsvNnDH5otgKYuxq4xz2391pNAHLeyl 5xiPM3sv2UVBKWlY1eDJW/7M/whEJqLVCiEg825zJ6UWzplEQRc= =IlGU -----END PGP SIGNATURE----- --------------MqhhBr3T509YMAcjxaB76F16--