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[2620:137:e000::1:20]) by mx.google.com with ESMTP id f14-20020aa7d84e000000b0051a3fb6c050si332784eds.187.2023.07.10.13.45.39; Mon, 10 Jul 2023 13:46:03 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=casper.20170209 header.b=hnJ+NuJo; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232158AbjGJUny (ORCPT + 99 others); Mon, 10 Jul 2023 16:43:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49302 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232051AbjGJUnx (ORCPT ); Mon, 10 Jul 2023 16:43:53 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 88648E42; Mon, 10 Jul 2023 13:43:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=aGQ2GHttWzJ+Nk3XqgE1qMHvrVsWPVFdkiJHip5axuY=; b=hnJ+NuJoHrGWnFQIHj5mwikc3Y f+ynvhq+4B/aEwy8FCPsgFshOQWVrWerLCxpuQBbeUnTyyz1X0U1Nqmo5shKPFaE2oMcX+P2NwLlm Hx6TYojYAi/XeM3hRmgQle7OUe0P4VkJ/Tt345eZQ34NwKAAmjbTCS8gD+17k8LCVxA5Uw2bKNxGK 2pBd5RYRhgtJ8EnVR9p6jVnQj2YQK6aJ3WeDQX+ZdDJGeDEqNezcYGk0XiuPM9EbIuKOpAhQmmDC0 VsWF9mJJKPpNAkiMNKSDiBc99gmwms10qIVtaqz0HiRd1zfD+6eV29vnvCGa1faKf7Aum+Nodg8wh gzQnfLWQ==; Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1qIxjR-00EuoL-Fj; Mon, 10 Jul 2023 20:43:41 +0000 From: "Matthew Wilcox (Oracle)" To: Andrew Morton Cc: "Matthew Wilcox (Oracle)" , linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Mike Rapoport , Anshuman Khandual Subject: [PATCH v5 04/38] mm: Add folio_flush_mapping() Date: Mon, 10 Jul 2023 21:43:05 +0100 Message-Id: <20230710204339.3554919-5-willy@infradead.org> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20230710204339.3554919-1-willy@infradead.org> References: <20230710204339.3554919-1-willy@infradead.org> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_BLOCKED, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1771067894395101444 X-GMAIL-MSGID: 1771067894395101444 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) Acked-by: Mike Rapoport (IBM) Reviewed-by: Anshuman Khandual --- 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 69b99b61ed72..794e4e55dc38 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -389,6 +389,26 @@ 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)); @@ -399,11 +419,7 @@ 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)); } /**