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Fri, 25 Sep 2026 21:38:40 -0700 (PDT) Received: from spider.bream-herring.ts.net ([103.6.151.236]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-343025a591csm2171406eec.12.2026.09.25.21.38.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 25 Sep 2026 21:38:40 -0700 (PDT) From: Matthias Goergens To: linux-fsdevel@vger.kernel.org, viro@zeniv.linux.org.uk, brauner@kernel.org, jack@suse.cz Cc: linux-kernel@vger.kernel.org, hch@infradead.org, djwong@kernel.org, david@fromorbit.com, amir73il@gmail.com, ansgar.loesser@kom.tu-darmstadt.de, Matthias Goergens Subject: [PATCH v5 0/2] vfs: add FILE_DEDUPE_RANGE_REPORT_PROGRESS flag to FIDEDUPERANGE Date: Sat, 26 Sep 2026 12:38:34 +0800 Message-ID: <20260926043836.3301898-1-matthias.goergens@gmail.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Dedupe tools advance their file offsets by bytes_deduped, but when the kernel shortens a request to a block boundary it still reports the requested length. Patch 2 adds a flag under which bytes_deduped is what the filesystem actually deduplicated. Patch 1 fixes the DAX comparator, whose return value would otherwise surface through the flag. Amir, thanks for the review; both points are taken in v5. Changes since v4 (https://lore.kernel.org/linux-fsdevel/cover.1789653814.git.matthias.goergens@gmail.com/): - flags is a plain rename of reserved2, without the union (Amir). - Dropped the paragraph about old callers and old kernels (Amir). - Documented the flag's effect on bytes_deduped in the UAPI header. - Patch 1 unchanged. The fstests test follows as generic/806 v3 in reply to its v2 on the fstests list. Matthias Goergens (2): dax: return the comparison error from dax_dedupe_file_range_compare() vfs: add FILE_DEDUPE_RANGE_REPORT_PROGRESS flag to FIDEDUPERANGE fs/dax.c | 2 +- fs/remap_range.c | 4 +++- include/uapi/linux/fs.h | 11 ++++++++++- 3 files changed, 14 insertions(+), 3 deletions(-) -- 2.55.0