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[96.60.249.169]) by smtp.gmail.com with ESMTPSA id 00721157ae682-78a799405f8sm3321927b3.42.2025.11.19.17.14.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 19 Nov 2025 17:14:02 -0800 (PST) Message-ID: <39d281ba-1ee4-49ae-9aae-e2bd65342e3f@gmail.com> Date: Wed, 19 Nov 2025 20:13:58 -0500 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: [PATCHSET v6 4/8] fuse: allow servers to use iomap for better file IO performance To: Gao Xiang , "Darrick J. Wong" Cc: bernd@bsbernd.com, joannelkoong@gmail.com, linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, miklos@szeredi.hu, neal@gompa.dev, linux-bcachefs@vger.kernel.org, linux-btrfs@vger.kernel.org, zfs-devel@list.zfsonlinux.org References: <176169810144.1424854.11439355400009006946.stgit@frogsfrogsfrogs> <20251119180449.GS196358@frogsfrogsfrogs> <1be4cb25-50e2-46fa-ba86-d6342e997e63@linux.alibaba.com> 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: <1be4cb25-50e2-46fa-ba86-d6342e997e63@linux.alibaba.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------Sm2qTEvY1lYhiLWXqYKC12fe" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------Sm2qTEvY1lYhiLWXqYKC12fe Content-Type: multipart/mixed; boundary="------------YD9g1t557jS98JGC63a0p9N2"; protected-headers="v1" From: Demi Marie Obenour To: Gao Xiang , "Darrick J. Wong" Cc: bernd@bsbernd.com, joannelkoong@gmail.com, linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, miklos@szeredi.hu, neal@gompa.dev, linux-bcachefs@vger.kernel.org, linux-btrfs@vger.kernel.org, zfs-devel@list.zfsonlinux.org Message-ID: <39d281ba-1ee4-49ae-9aae-e2bd65342e3f@gmail.com> Subject: Re: [PATCHSET v6 4/8] fuse: allow servers to use iomap for better file IO performance References: <176169810144.1424854.11439355400009006946.stgit@frogsfrogsfrogs> <20251119180449.GS196358@frogsfrogsfrogs> <1be4cb25-50e2-46fa-ba86-d6342e997e63@linux.alibaba.com> In-Reply-To: <1be4cb25-50e2-46fa-ba86-d6342e997e63@linux.alibaba.com> --------------YD9g1t557jS98JGC63a0p9N2 Content-Type: multipart/mixed; boundary="------------hjHbB7qRf0ZdQUsi6lUyJaFo" --------------hjHbB7qRf0ZdQUsi6lUyJaFo Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 11/19/25 16:51, Gao Xiang wrote: > On 2025/11/20 05:00, Gao Xiang wrote: >> On 2025/11/20 02:04, Darrick J. Wong wrote: >>> On Wed, Nov 19, 2025 at 04:19:36AM -0500, Demi Marie Obenour wrote: >>>>> By keeping the I/O path mostly within the kernel, we can dramatical= ly >>>>> increase the speed of disk-based filesystems. >>>> >>>> ZFS, BTRFS, and bcachefs all support compression, checksumming, >>>> and RAID.=C2=A0 ZFS and bcachefs also support encryption, and f2fs a= nd >>>> ext4 support fscrypt. >>>> >>>> Will this patchset be able to improve FUSE implementations of these >>>> filesystems?=C2=A0 I'd rather not be in the situation where one can = have >>>> a FUSE filesystem that is fast, but only if it doesn't support moder= n >>>> data integrity or security features. >>> >>> Not on its own, no. >>> >>>> I'm not a filesystem developer, but here are some ideas (that you >>>> can take or leave): >>>> >>>> 1. Keep the compression, checksumming, and/or encryption in-kernel, >>>> =C2=A0=C2=A0=C2=A0 and have userspace tell the kernel what algorithm= and/or encryption >>>> =C2=A0=C2=A0=C2=A0 key to use.=C2=A0 These algorithms are generally = well-known and secure >>>> =C2=A0=C2=A0=C2=A0 against malicious input.=C2=A0 It might be necess= ary to make an extra >>>> =C2=A0=C2=A0=C2=A0 data copy, but ideally that copy could just stay = within the >>>> =C2=A0=C2=A0=C2=A0 CPU caches. >>> >>> I think this is easily doable for fscrypt and compression since (IIRC= ) >>> the kernel filesystems already know how to transform data for I/O, an= d >>> nowadays iomap allows hooking of bios before submission and/or after >>> endio.=C2=A0 Obviously you'd have to store encryption keys in the ker= nel >>> somewhere. >> >> I think it depends, since (this way) it tries to reuse some of the >> existing kernel filesystem implementations (and assuming the code is >> safe), so at least it still needs to load a dedicated kernel module >> for such usage at least. >> >> I think it's not an issue for userspace ext4 of course (because ext4 >> and fscrypt is almost builtin for all kernels), but for out-of-tree >> fses even pure userspace fses, I'm not sure it's doable to load the >> module in a container context. >=20 > Two examples for reference: >=20 > - For compression, in-tree f2fs already has a compression header > in data of each compressed extent: > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/= tree/fs/f2fs/f2fs.h?h=3Dv6.17#n1497 >=20 > while other fs may store additional metadata in extent metadata > or other place. Extent metadata shouldn't be a problem, as that is already available during reads and written asynchronously for writes. The headers are awkward, though, and might need some special-casing. > - gocryptfs (a pure userspace FUSE fs) uses a different format > from fscrypt (encrypted data seems even unaligned on disk): > https://github.com/rfjakob/gocryptfs/blob/master/Documentation/file= -format.md This is probably an anti-pattern in general, as I expect it precludes the use of inline encryption hardware via blk-crypto. --=20 Sincerely, Demi Marie Obenour (she/her/hers) --------------hjHbB7qRf0ZdQUsi6lUyJaFo 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/ 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