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[96.60.249.169]) by smtp.gmail.com with ESMTPSA id 00721157ae682-77f971c31aasm11657877b3.63.2025.10.03.18.09.05 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 03 Oct 2025 18:09:05 -0700 (PDT) Message-ID: Date: Fri, 3 Oct 2025 21:09:01 -0400 Precedence: bulk X-Mailing-List: linux-btrfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Demi Marie Obenour Subject: Re: Can the output of FIEMAP on BTRFS be used to check if a file and its reflink copy might have diverged? To: Christoph Hellwig Cc: Chris Laprise , linux-btrfs@vger.kernel.org, linux-xfs@vger.kernel.org References: <38f350b0-9a71-4627-9d36-57bf2f85e67a@gmail.com> <693793db-3431-48b3-8913-aadb86bc4ebc@gmail.com> Content-Language: en-US In-Reply-To: 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 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------NAaPN9UiSsmB0TYtyJSAJMQT" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------NAaPN9UiSsmB0TYtyJSAJMQT Content-Type: multipart/mixed; boundary="------------l0D0mHkDcHX0kXnZ2bptsqkd"; protected-headers="v1" From: Demi Marie Obenour To: Christoph Hellwig Cc: Chris Laprise , linux-btrfs@vger.kernel.org, linux-xfs@vger.kernel.org Message-ID: Subject: Re: Can the output of FIEMAP on BTRFS be used to check if a file and its reflink copy might have diverged? References: <38f350b0-9a71-4627-9d36-57bf2f85e67a@gmail.com> <693793db-3431-48b3-8913-aadb86bc4ebc@gmail.com> In-Reply-To: --------------l0D0mHkDcHX0kXnZ2bptsqkd Content-Type: multipart/mixed; boundary="------------QARhhO5E2C0d0NS926U0ZuAf" --------------QARhhO5E2C0d0NS926U0ZuAf Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 10/3/25 03:44, Christoph Hellwig wrote: > On Mon, Sep 29, 2025 at 07:55:22PM -0400, Demi Marie Obenour wrote: >> Can two extents have the same offset on disk but different logical con= tents? >> For XFS that seems impossible unless a realtime device is involved, wh= ich >> is not the case here. > Only with the RT device. But again that is insider knowledge and not a= n > API exposed to applications. More importantly the offset can change > underneath without any notice to the application. Are there cases where the offset can change even if neither file is written to and there is no RT device? >> Is it easier if one requires the filesystem to be read-only? Taking a= >> device-mapper snapshot (thin or CoW) before the backup is not too oner= ous, >> at least if the filesystem is already on an LVM LV. > At least that locks out other changes. But it is a rather opaque setup= =2E It's indeed not great, but if it is set up by the OS installer the snapshots could all be automated. Is it at currently safe in this case, provided that online fsck is disabled? --=20 Sincerely, Demi Marie Obenour (she/her/hers) --------------QARhhO5E2C0d0NS926U0ZuAf 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 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attachment; filename="OpenPGP_signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEopQtqVJW1aeuo9/sszaHOrMp8lMFAmjgc64ACgkQszaHOrMp 8lOCVQ/9EpGiPiyd9RJZqoTW/KtSLPLuu8t412Gi71ArKinSn4iL/SPvOiugog3p dbm629V/fWcnUZcCbTt7UpBaaaFo5eAIMO8D+tMfqZ49za/+7N2RBTEpkG0oUntu eN44uuDQoz2okEdm6eip9Rm1pO6WD2BOmZj3A//nqeQg4XiwYvWIPrH1RcTnFl8B g/WxXA/CSY3IiiYhi9LmSLKdsMjUvEJl5oJd7UzcmKJ/oXmt7x9LPLkE7rxSQzKd ZDCREtnJ+dniGL2JSOnkVGzfJpLochwzRGR7zaK514cN09WeS0/pfdOkcEbT2T6+ I69LT8KqZhwD06HZYEpZ1qa9M60XaYSrqYk2+DQTF/dUi3phoQC1tD+MlYvWc4kd jBJdd0cQUQM0wBSVjLkwDCtEd6M1oAk+f/hVqO67YR7dI67BKsZnBfAfppwYPawy kvEYzu5BvX7rFfOAKtz60NaEzrVyJSc7AiDqedcJSMbInOkVcN9s2qu6Uqk2Cvp2 0yqZydQLzhkIENUczDu90hgVq/wmQnrMS3cXX9uTu6pcXoFfNK99NUkb0+2deeaI fUhawGKqb1w8Qy9xUfSvyYm9Lj/DkjZptTGEwZIVx5eJXNI0/SNgfpw+L3wGDyhR Lk4tZwkf1Au8KRUIR9pG+HKddlD86h06EevHJYcIEFIgVDoIgr8= =IWkY -----END PGP SIGNATURE----- --------------NAaPN9UiSsmB0TYtyJSAJMQT--