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=-18.8 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 180E4C433ED for ; Wed, 5 May 2021 16:19:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E414360FD9 for ; Wed, 5 May 2021 16:19:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233884AbhEEQUM (ORCPT ); Wed, 5 May 2021 12:20:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34722 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233902AbhEEQUJ (ORCPT ); Wed, 5 May 2021 12:20:09 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C2541C06174A; Wed, 5 May 2021 09:19:12 -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=TOcA+5xL6B0vTfPXpuhbkkfct64kvjU4a4xf29UW6uw=; b=AY4CsH4dOnn9iGq/u55jXZThjc 2E4jBmhOlNVOtl6xpv9wS6UzDMYCgWMNGSiRc8Hz3fThqri+D/qRG0gMzWCwEC7F4vuGO8dA8TMB3 1TU8bgQfB7iyB3JiCic4TWzXwbgdnx09/7dqB364y22nag25qdt7JKMrEAzVfRIMNC3CnPgDaER2q plo+5EWw00lst3Rfla8w5esjWZfb8KXX07eIOuYtK8kGaYjne8H7BF5ovkKv31bgZnBEHdu4fBiAm egHgMrsp5CExZ9ELaQPYdvk9NMp/AmbfSySYIY5cvyro6icqHQOFYAD45HS2oHlxq1M3G23Rb3NRM bPQyVx1g==; Received: from willy by casper.infradead.org with local (Exim 4.94 #2 (Red Hat Linux)) id 1leKDh-000Zt5-8N; Wed, 05 May 2021 16:18:09 +0000 From: "Matthew Wilcox (Oracle)" To: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Cc: "Matthew Wilcox (Oracle)" , linux-kernel@vger.kernel.org Subject: [PATCH v9 62/96] mm/writeback: Add filemap_dirty_folio Date: Wed, 5 May 2021 16:05:54 +0100 Message-Id: <20210505150628.111735-63-willy@infradead.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210505150628.111735-1-willy@infradead.org> References: <20210505150628.111735-1-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_nobuffers() as a wrapper around filemap_dirty_folio(). This can use a cast to struct folio because we know that the ->set_page_dirty address space op is always called with a page pointer that happens to also be a folio pointer. Saves 7 bytes of kernel text. Signed-off-by: Matthew Wilcox (Oracle) --- include/linux/writeback.h | 1 + mm/page-writeback.c | 64 ++++++++++++++++++++++----------------- 2 files changed, 37 insertions(+), 28 deletions(-) diff --git a/include/linux/writeback.h b/include/linux/writeback.h index 8e5c5bb16e2d..aa372f6d2b55 100644 --- a/include/linux/writeback.h +++ b/include/linux/writeback.h @@ -398,6 +398,7 @@ void writeback_set_ratelimit(void); void tag_pages_for_writeback(struct address_space *mapping, pgoff_t start, pgoff_t end); +bool filemap_dirty_folio(struct address_space *mapping, struct folio *folio); void account_page_redirty(struct page *page); void sb_mark_inode_writeback(struct inode *inode); diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 88f6734706c9..93a00d3efa55 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -2489,39 +2489,47 @@ void __folio_mark_dirty(struct folio *folio, struct address_space *mapping, } EXPORT_SYMBOL_GPL(__folio_mark_dirty); -/* - * For address_spaces which do not use buffers. Just tag the page as dirty in - * the xarray. - * - * This is also used when a single buffer is being dirtied: we want to set the - * page dirty in that case, but not all the buffers. This is a "bottom-up" - * dirtying, whereas __set_page_dirty_buffers() is a "top-down" dirtying. - * - * The caller must ensure this doesn't race with truncation. Most will simply - * hold the page lock, but e.g. zap_pte_range() calls with the page mapped and - * the pte lock held, which also locks out truncation. +/** + * filemap_dirty_folio - Mark a folio dirty for filesystems which do not use buffer_heads. + * @mapping: Address space this folio belongs to. + * @folio: Folio to be marked as dirty. + * + * Filesystems which do not use buffer heads should call this function + * from their set_page_dirty address space operation. It ignores the + * contents of folio_private(), so if the filesystem marks individual + * blocks as dirty, the filesystem should handle that itself. + * + * This is also sometimes used by filesystems which use buffer_heads when + * a single buffer is being dirtied: we want to set the folio dirty in + * that case, but not all the buffers. This is a "bottom-up" dirtying, + * whereas __set_page_dirty_buffers() is a "top-down" dirtying. + * + * The caller must ensure this doesn't race with truncation. Most will + * simply hold the folio lock, but e.g. zap_pte_range() calls with the + * folio mapped and the pte lock held, which also locks out truncation. */ -int __set_page_dirty_nobuffers(struct page *page) +bool filemap_dirty_folio(struct address_space *mapping, struct folio *folio) { - lock_page_memcg(page); - if (!TestSetPageDirty(page)) { - struct address_space *mapping = page_mapping(page); - if (!mapping) { - unlock_page_memcg(page); - return 1; - } + lock_folio_memcg(folio); + if (folio_test_set_dirty_flag(folio)) { + unlock_folio_memcg(folio); + return false; + } - __set_page_dirty(page, mapping, !PagePrivate(page)); - unlock_page_memcg(page); + __folio_mark_dirty(folio, mapping, !folio_private(folio)); + unlock_folio_memcg(folio); - if (mapping->host) { - /* !PageAnon && !swapper_space */ - __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); - } - return 1; + if (mapping->host) { + /* !PageAnon && !swapper_space */ + __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); } - unlock_page_memcg(page); - return 0; + return true; +} +EXPORT_SYMBOL(filemap_dirty_folio); + +int __set_page_dirty_nobuffers(struct page *page) +{ + return filemap_dirty_folio(page_mapping(page), (struct folio *)page); } EXPORT_SYMBOL(__set_page_dirty_nobuffers); -- 2.30.2