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Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Cc: Jinchao Wang Subject: [PATCH 1/2] mm: add filemap_lock_folio_nowait helper Date: Thu, 8 Jan 2026 20:39:24 +0800 Message-ID: <20260108123957.1123502-1-wangjinchao600@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Introduce filemap_lock_folio_nowait() to allow non-blocking folio lock attempts using FGP_NOWAIT. This allows callers to avoid AB-BA deadlocks by dropping higher-level locks when a folio is already locked. Signed-off-by: Jinchao Wang --- include/linux/pagemap.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index 31a848485ad9..b9d818a9409b 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -825,6 +825,12 @@ static inline struct folio *filemap_lock_folio(struct address_space *mapping, return __filemap_get_folio(mapping, index, FGP_LOCK, 0); } +static inline struct folio *filemap_lock_folio_nowait(struct address_space *mapping, + pgoff_t index) +{ + return __filemap_get_folio(mapping, index, FGP_LOCK | FGP_NOWAIT, 0); +} + /** * filemap_grab_folio - grab a folio from the page cache * @mapping: The address space to search -- 2.43.0