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Fri, 16 Jan 2026 10:12:36 +0000 (GMT) From: Kundan Kumar To: viro@zeniv.linux.org.uk, brauner@kernel.org, jack@suse.cz, willy@infradead.org, mcgrof@kernel.org, clm@meta.com, david@fromorbit.com, amir73il@gmail.com, axboe@kernel.dk, hch@lst.de, ritesh.list@gmail.com, djwong@kernel.org, dave@stgolabs.net, cem@kernel.org, wangyufei@vivo.com Cc: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-xfs@vger.kernel.org, gost.dev@samsung.com, kundan.kumar@samsung.com, anuj20.g@samsung.com, vishak.g@samsung.com, joshi.k@samsung.com Subject: [PATCH v3 1/6] iomap: add write ops hook to attach metadata to folios Date: Fri, 16 Jan 2026 15:38:13 +0530 Message-Id: <20260116100818.7576-2-kundan.kumar@samsung.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260116100818.7576-1-kundan.kumar@samsung.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CMS-MailID: 20260116101241epcas5p330f9c335a096aaaefda4b7d3c38d6038 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" CMS-TYPE: 105P cpgsPolicy: CPGSC10-542,Y X-CFilter-Loop: Reflected X-CMS-RootMailID: 20260116101241epcas5p330f9c335a096aaaefda4b7d3c38d6038 References: <20260116100818.7576-1-kundan.kumar@samsung.com> X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 9A989100003 X-Rspam-User: X-Stat-Signature: s8ceq3gt8h9rmq6fioznbgyg4xueauxf X-HE-Tag: 1768558369-979668 X-HE-Meta: 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 /1Q+iUZG u1U2sS9hdoxJqoeuaS8i9T6FniSnk7WMl2GzMGdee7CVGhtRZmzuZBTbI+VsuQkHz/hybugOjmVJ0x7qpRHSnRJuOIFuFT8JJXutAW+PfJ25k6Pl6GViivGb2RA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Add an optional iomap_attach_folio callback to struct iomap_write_ops. Filesystems may use this hook to tag folios during write-begin without changing iomap core behavior. Signed-off-by: Kundan Kumar Signed-off-by: Anuj Gupta --- fs/iomap/buffered-io.c | 3 +++ include/linux/iomap.h | 3 +++ 2 files changed, 6 insertions(+) diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index 8b847a1e27f1..701f2e9cd010 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -699,6 +699,9 @@ static int __iomap_write_begin(const struct iomap_iter *iter, size_t from = offset_in_folio(folio, pos), to = from + len; size_t poff, plen; + if (write_ops && write_ops->tag_folio) + write_ops->tag_folio(&iter->iomap, folio, pos, len); + /* * If the write or zeroing completely overlaps the current folio, then * entire folio will be dirtied so there is no need for diff --git a/include/linux/iomap.h b/include/linux/iomap.h index 73dceabc21c8..14ef88f8ee84 100644 --- a/include/linux/iomap.h +++ b/include/linux/iomap.h @@ -176,6 +176,9 @@ struct iomap_write_ops { */ int (*read_folio_range)(const struct iomap_iter *iter, struct folio *folio, loff_t pos, size_t len); + + void (*tag_folio)(const struct iomap *iomap, + struct folio *folio, loff_t pos, size_t len); }; /* -- 2.25.1