From mboxrd@z Thu Jan 1 00:00:00 1970 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 262B3C6379F for ; Sat, 11 Feb 2023 03:40:05 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id B5DF56B007B; Fri, 10 Feb 2023 22:40:04 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id A98976B007D; Fri, 10 Feb 2023 22:40:04 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 95F0E6B007E; Fri, 10 Feb 2023 22:40:04 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id 839736B007B for ; Fri, 10 Feb 2023 22:40:04 -0500 (EST) Received: from smtpin24.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay08.hostedemail.com (Postfix) with ESMTP id 6408A14139E for ; Sat, 11 Feb 2023 03:40:04 +0000 (UTC) X-FDA: 80453607528.24.F054464 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf17.hostedemail.com (Postfix) with ESMTP id B0C9540011 for ; Sat, 11 Feb 2023 03:40:02 +0000 (UTC) Authentication-Results: imf17.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b=WG+cCCwQ; spf=none (imf17.hostedemail.com: domain of willy@infradead.org has no SPF policy when checking 90.155.50.34) smtp.mailfrom=willy@infradead.org; dmarc=none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1676086802; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=aaXlbA2/BvRg6HHDAadnVZCwlkGxkg/4CEs3FrmdfUo=; b=Aq96PwBPh+togdesVE5Mx1YIrbVw6DaraP5rE48tvOwG+p1HyW3GWTUwEwMHfh/U4UJ8kC 3SAZZrMWiC5feWK8DoELEjoj7UvGXX+kxrSOfUUrN2EoHMS4Td9mPzrVS//hlDDeg6kkJD YVp4UKiuK/51k7CmpdexPNhRbsaCfuk= ARC-Authentication-Results: i=1; imf17.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b=WG+cCCwQ; spf=none (imf17.hostedemail.com: domain of willy@infradead.org has no SPF policy when checking 90.155.50.34) smtp.mailfrom=willy@infradead.org; dmarc=none ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1676086802; a=rsa-sha256; cv=none; b=jzDOcQZC/buBkuQOJ+ngMgGHXYyFqtDflsxgrQ/mT/r1Wausw6bKb5n6TJWV4QC+Sn8e9p n4ctV/9GivYy+gz8ydhZ1Ft/QN9YOpRTmxQFqWeOZUNOZK17nkkDM5nomQiMW24WUdIPWv A1k54fjJ6xwKfOKPY/MFvelSwcomQLA= 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=aaXlbA2/BvRg6HHDAadnVZCwlkGxkg/4CEs3FrmdfUo=; b=WG+cCCwQUC/ZjIWR94a19/LBWU lVGQ77hW0CWVTgjmxOD1LgDbemxdMo08QnirJDUmnVuyhvwWRkEM/syoO2RC6FQNRLMnghc1djwhM rGHuc2XWxNjniFmcnC46So5vf5OEvRgFUfMsCWJOCiXP2T9+nSwg4lzGofnlY7KO9Uyk014+AfvZm S/ryGW9ZnnIXXfIjqPC780Hz7uihlK9Fgyholr+fIj2ZFurhPmdccXibd3knmsPYfcy277UqvBrFo /teaeBbhh1O/UpeW9R2vrL+Gd9WR5k/yNxJ2mA61TYWpOCNT2NfQrkpzXy46rRhv+jl65BXKqN6oC r6OWn31w==; Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1pQgjv-003k2k-9Y; Sat, 11 Feb 2023 03:39:51 +0000 From: "Matthew Wilcox (Oracle)" To: linux-mm@kvack.org, linux-arch@vger.kernel.org Cc: "Matthew Wilcox (Oracle)" Subject: [PATCH 3/7] mm: Add folio_flush_mapping() Date: Sat, 11 Feb 2023 03:39:44 +0000 Message-Id: <20230211033948.891959-4-willy@infradead.org> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20230211033948.891959-1-willy@infradead.org> References: <20230211033948.891959-1-willy@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: B0C9540011 X-Stat-Signature: yf314d4ygfb4n1tacbaptdppzm9ugms5 X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1676086802-435600 X-HE-Meta: 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 el/Lvtjp 6SktFXUDoCtlQh6YR6LsdsP9Sa0DcluqsvEh9PrTr+6ZRcQsHsq2O75IIGwUbUt3b/CDDxSAvCVyGhuXKrCNXXL7OZucXe4RyymwJrCx7ItdaEjDV2ke5BO40robwfhkcag4Alxs3aXkF97pI5jsFJBEDTBUJuxoBcZ9myO6BmKnbde3vrqSYd5W+wmRW3bzCSbl34hPfd0LjGCb26rDZiJoL/uoc3QXQzgzH1WzLX0tIy1c/MqoIRV6Uug== 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)); } /** -- 2.39.1