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 X-Spam-Level: X-Spam-Status: No, score=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DCD22C49EA2 for ; Tue, 22 Jun 2021 12:39:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C6EAC60FE7 for ; Tue, 22 Jun 2021 12:39:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231409AbhFVMmD (ORCPT ); Tue, 22 Jun 2021 08:42:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48282 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231135AbhFVMlH (ORCPT ); Tue, 22 Jun 2021 08:41:07 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 53BCEC061226; Tue, 22 Jun 2021 05:38:49 -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=11kdbqvYhRBDCHO2+D2gr2DMHWP2KlimD+LgU9BHCe0=; b=cFgGmWYDTK9mWSw0gdQQKo7U7m 9yrIfZwdCgGXy8Ha8rqFIs8xSyYk8zcZgQFsrpv+WZGvqNKah4zBRmNGUfDRP6tholvGdIU9/li/b 0MfDXC2OFf7R9YEk2EXS9sDjaIYxgO2tbDgW7SYtcfQcwDabVYRTQPyr61PraWnKWRsrXZLk8fElJ xLNW6DcdJh0YkqMtfQRu3D/uH8zGnQmEnVawP5cYDGCSqLrYC27rdc7qrV4qfQV2vIvvoJ1sfH+It T4Iod+iDsOjUR/Nx7yUPaQveNvJQVb843Ho2hRcHlAntQ77XL6yOJZNUnqW61h5K4tJs6usreB4nJ lf2YLB8g==; Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1lvfeJ-00EHmg-5r; Tue, 22 Jun 2021 12:37:22 +0000 From: "Matthew Wilcox (Oracle)" To: akpm@linux-foundation.org Cc: "Matthew Wilcox (Oracle)" , linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 26/46] mm/writeback: Add folio_mark_dirty() Date: Tue, 22 Jun 2021 13:15:31 +0100 Message-Id: <20210622121551.3398730-27-willy@infradead.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210622121551.3398730-1-willy@infradead.org> References: <20210622121551.3398730-1-willy@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Reimplement set_page_dirty() as a wrapper around folio_mark_dirty(). There is no change to filesystems as they were already being called with the compound_head of the page being marked dirty. We avoid several calls to compound_head(), both statically (through using folio_dirty() instead of PageDirty() and dynamically by calling folio_mapping() instead of page_mapping(). Also return bool instead of int to show the range of values actually returned, and add kernel-doc. Signed-off-by: Matthew Wilcox (Oracle) --- include/linux/mm.h | 3 ++- mm/folio-compat.c | 6 ++++++ mm/page-writeback.c | 35 +++++++++++++++++++---------------- 3 files changed, 27 insertions(+), 17 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index 5609095ffcac..3c8dfcb56fa5 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1988,7 +1988,8 @@ int redirty_page_for_writepage(struct writeback_control *wbc, struct page *page); void account_page_cleaned(struct page *page, struct address_space *mapping, struct bdi_writeback *wb); -int set_page_dirty(struct page *page); +bool folio_mark_dirty(struct folio *folio); +bool set_page_dirty(struct page *page); int set_page_dirty_lock(struct page *page); void __cancel_dirty_page(struct page *page); static inline void cancel_dirty_page(struct page *page) diff --git a/mm/folio-compat.c b/mm/folio-compat.c index db9190fa6bf5..60780ceca363 100644 --- a/mm/folio-compat.c +++ b/mm/folio-compat.c @@ -89,3 +89,9 @@ bool set_page_writeback(struct page *page) return folio_start_writeback(page_folio(page)); } EXPORT_SYMBOL(set_page_writeback); + +bool set_page_dirty(struct page *page) +{ + return folio_mark_dirty(page_folio(page)); +} +EXPORT_SYMBOL(set_page_dirty); diff --git a/mm/page-writeback.c b/mm/page-writeback.c index ffb55ca2ddd5..73b937955cc1 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -2560,18 +2560,21 @@ int redirty_page_for_writepage(struct writeback_control *wbc, struct page *page) } EXPORT_SYMBOL(redirty_page_for_writepage); -/* - * Dirty a page. +/** + * folio_mark_dirty - Mark a folio as being modified. + * @folio: The folio. + * + * For folios with a mapping this should be done under the page lock + * for the benefit of asynchronous memory errors who prefer a consistent + * dirty state. This rule can be broken in some special cases, + * but should be better not to. * - * For pages with a mapping this should be done under the page lock for the - * benefit of asynchronous memory errors who prefer a consistent dirty state. - * This rule can be broken in some special cases, but should be better not to. + * Return: True if the folio was newly dirtied, false if it was already dirty. */ -int set_page_dirty(struct page *page) +bool folio_mark_dirty(struct folio *folio) { - struct address_space *mapping = page_mapping(page); + struct address_space *mapping = folio_mapping(folio); - page = compound_head(page); if (likely(mapping)) { /* * readahead/lru_deactivate_page could remain @@ -2583,17 +2586,17 @@ int set_page_dirty(struct page *page) * it will confuse readahead and make it restart the size rampup * process. But it's a trivial problem. */ - if (PageReclaim(page)) - ClearPageReclaim(page); - return mapping->a_ops->set_page_dirty(page); + if (folio_reclaim(folio)) + folio_clear_reclaim_flag(folio); + return mapping->a_ops->set_page_dirty(&folio->page); } - if (!PageDirty(page)) { - if (!TestSetPageDirty(page)) - return 1; + if (!folio_dirty(folio)) { + if (!folio_test_set_dirty_flag(folio)) + return true; } - return 0; + return false; } -EXPORT_SYMBOL(set_page_dirty); +EXPORT_SYMBOL(folio_mark_dirty); /* * set_page_dirty() is racy if the caller has no reference against -- 2.30.2