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Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1pcJTK-00DYAv-LY; Wed, 15 Mar 2023 05:14:46 +0000 From: "Matthew Wilcox (Oracle)" To: linux-arch@vger.kernel.org Cc: "Matthew Wilcox (Oracle)" , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 03/36] mm: Add folio_flush_mapping() Date: Wed, 15 Mar 2023 05:14:11 +0000 Message-Id: <20230315051444.3229621-4-willy@infradead.org> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20230315051444.3229621-1-willy@infradead.org> References: <20230315051444.3229621-1-willy@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: 15FFFC000F X-Rspamd-Server: rspam01 X-Stat-Signature: g6tyn9ox3wmy4ns7qewq7eem85ezrfxw X-HE-Tag: 1678857288-884968 X-HE-Meta: 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 ogM6ynHf 4eMRGYuKI91JF9cjPTvhjpkR6jkga4gEcbbeCPKOADPUNxJDhn8Xc41edMUU5gZdh55sg22gDm1qMSeVWSOlpgSX/NaH72f5PUnyeH55lFEdpEnYDxGZYo6CXmIUvTuh4YWwtnqcpOeQ2ZSH7zTpejFiVYHbVO7JNxUMJhX4fyI5Y65Yz8aNIFjq5IfHFEnOABT6CPgnKLVE9JnnL804vsu4/UcXtRZzYyXQAK83J26QOgqIkXrZQv+iGnQ== 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: This is the folio equivalent of page_mapping_file(), but rename it to make it clear that it's very different from page_file_mapping(). Theoretically, there's nothing flush-only about it, but there are no other users today, and I doubt there will be; it's almost always more useful to know the swapfile's mapping or the swapcache's mapping. Signed-off-by: Matthew Wilcox (Oracle) --- include/linux/pagemap.h | 26 +++++++++++++++++++++----- 1 file changed, 21 insertions(+), 5 deletions(-) diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index a56308a9d1a4..e56c2023aa0e 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -369,6 +369,26 @@ static inline struct address_space *folio_file_mapping(struct folio *folio) return folio->mapping; } +/** + * folio_flush_mapping - Find the file mapping this folio belongs to. + * @folio: The folio. + * + * For folios which are in the page cache, return the mapping that this + * page belongs to. Anonymous folios return NULL, even if they're in + * the swap cache. Other kinds of folio also return NULL. + * + * This is ONLY used by architecture cache flushing code. If you aren't + * writing cache flushing code, you want either folio_mapping() or + * folio_file_mapping(). + */ +static inline struct address_space *folio_flush_mapping(struct folio *folio) +{ + if (unlikely(folio_test_swapcache(folio))) + return NULL; + + return folio_mapping(folio); +} + static inline struct address_space *page_file_mapping(struct page *page) { return folio_file_mapping(page_folio(page)); @@ -379,11 +399,7 @@ static inline struct address_space *page_file_mapping(struct page *page) */ static inline struct address_space *page_mapping_file(struct page *page) { - struct folio *folio = page_folio(page); - - if (unlikely(folio_test_swapcache(folio))) - return NULL; - return folio_mapping(folio); + return folio_flush_mapping(page_folio(page)); } /** -- 2.39.2