From patchwork Mon Feb 27 17:57:14 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Wilcox X-Patchwork-Id: 13154053 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 15F76C7EE2E for ; Mon, 27 Feb 2023 17:58:18 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 537756B00A2; Mon, 27 Feb 2023 12:57:56 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 425076B00A6; Mon, 27 Feb 2023 12:57:56 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 00C6D6B00A9; Mon, 27 Feb 2023 12:57:55 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id CE76C6B00A2 for ; 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bh=aaXlbA2/BvRg6HHDAadnVZCwlkGxkg/4CEs3FrmdfUo=; b=HXN9VHt2EFXUIhhFmEnV3MVjKc W8bimZyhdFaayUqTL0aWIlWF4u8HSlrCZsPP6sAgvIwuQhK9Xu6jYzgV7d8u496T7uVOMbbb7lKs2 DiMor3aKe0pkza1VKFtk5sS4gi0rR8DzvDgOvfd+wGjAUOw1XZ3HutdOhQgQHoIB51MWYkybo0Mhy EPb4RTDx8bELqsN7hhScXf6q+G0xfo0BODTUyYYkw+Jzst9swDFfIaImLaFI07iafp0gD5Sh/CUdj NjVT0AXThjTjSN7OuG3+iOmCQUo+eSPJvGLcNaowabymnfQKN0Ul+3Xlfew5Gx285pk6Lsj1fXtFk OabJICJg==; Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1pWhkt-000IWt-9T; Mon, 27 Feb 2023 17:57:43 +0000 From: "Matthew Wilcox (Oracle)" To: linux-mm@kvack.org, linux-arch@vger.kernel.org Cc: "Matthew Wilcox (Oracle)" , linux-kernel@vger.kernel.org Subject: [PATCH v2 03/30] mm: Add folio_flush_mapping() Date: Mon, 27 Feb 2023 17:57:14 +0000 Message-Id: <20230227175741.71216-4-willy@infradead.org> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20230227175741.71216-1-willy@infradead.org> References: <20230227175741.71216-1-willy@infradead.org> MIME-Version: 1.0 X-Rspam-User: X-Rspamd-Server: rspam03 X-Stat-Signature: d19ajc95xim9em1pq9im95hb6gniyetw X-Rspamd-Queue-Id: B4F77160026 X-HE-Tag: 1677520673-134032 X-HE-Meta: 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 +0kDmWgV yM2LSBt9QpaYubTu9zr7AYJm2apT3bmXq7n+2NrE16d+vv/gfv5yk7yhJ61+9ebtIeRKdVQyJAyo3UnDZWAZU7YjFL7ytzgqvkmZ+eM0peOIqvjRtAVPZeJTPlLWqtuvYaCNG7RUfzlzmqPQTXbtvUwJVQYIW3RMCUPy9Ag9O8r2ktrV8GkzwIni5awrl3rG4QCVD5talTbWrenryVhHIClfHeg7bMGJ3jAoDwHCOrG6lpyboDcIb5ZX+3g== 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 51b75b89730e..647c5a036a97 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 swapcache_mapping(folio); + + return folio->mapping; +} + 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)); } /**