From patchwork Wed May 5 15:05:26 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Matthew Wilcox (Oracle)" X-Patchwork-Id: 12240275 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=ham 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 E7797C433B4 for ; Wed, 5 May 2021 15:50:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B5337613D6 for ; Wed, 5 May 2021 15:50:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233627AbhEEPvo (ORCPT ); Wed, 5 May 2021 11:51:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56484 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233620AbhEEPvm (ORCPT ); Wed, 5 May 2021 11:51:42 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2A129C061574; Wed, 5 May 2021 08:50:46 -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=PEkpv04xlEycUuYOFH6FY05xykLzeK9vByF8d3O4klI=; b=esqWG7Jyg4NUFq14Gw64keFway Vu5ckUQDEEEnFNCyfUBIZdPqjkKrm0pTWxgKZ/MEcSZR82V+FnCuNH9fBQYsnlalHBeNl/fNRtw23 usH0t0xCfp1eqdKJcFoeF99T1xVoJE9JeIwkwaumNHO1WBudA7XDA7UQ8IOAqc3u5RIqo2V/egEHA 5wleSRPuZV3Bwzd/RLDjWBuhBBJHzlglbghS8Rtc4PctcJ08m9UL+pT5CTp//lK7uqlmcXVDPsuGo HRZKLQxvqm34vNyTwx1BE7t2MO6m2+WVDvQzo/PveZ4hLBXvZIhVtglE/KLCfQ8ro9NOSMQCjxwRU Ll1XqE8A==; Received: from willy by casper.infradead.org with local (Exim 4.94 #2 (Red Hat Linux)) id 1leJjZ-000WaU-HJ; Wed, 05 May 2021 15:47:53 +0000 From: "Matthew Wilcox (Oracle)" To: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Cc: "Matthew Wilcox (Oracle)" , linux-kernel@vger.kernel.org, Christoph Hellwig , Jeff Layton Subject: [PATCH v9 34/96] mm/writeback: Add folio_wait_stable Date: Wed, 5 May 2021 16:05:26 +0100 Message-Id: <20210505150628.111735-35-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 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Move wait_for_stable_page() into the folio compatibility file. folio_wait_stable() avoids a call to compound_head() and is 14 bytes smaller than wait_for_stable_page() was. The net text size grows by 24 bytes as a result of this patch. Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: Christoph Hellwig Acked-by: Jeff Layton --- include/linux/pagemap.h | 1 + mm/folio-compat.c | 6 ++++++ mm/page-writeback.c | 24 ++++++++++++++---------- 3 files changed, 21 insertions(+), 10 deletions(-) diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index 8849180c783c..dd98b25fec49 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -833,6 +833,7 @@ int folio_wait_writeback_killable(struct folio *folio); void end_page_writeback(struct page *page); void folio_end_writeback(struct folio *folio); void wait_for_stable_page(struct page *page); +void folio_wait_stable(struct folio *folio); void page_endio(struct page *page, bool is_write, int err); diff --git a/mm/folio-compat.c b/mm/folio-compat.c index 41275dac7a92..3c83f03b80d7 100644 --- a/mm/folio-compat.c +++ b/mm/folio-compat.c @@ -29,3 +29,9 @@ void wait_on_page_writeback(struct page *page) return folio_wait_writeback(page_folio(page)); } EXPORT_SYMBOL_GPL(wait_on_page_writeback); + +void wait_for_stable_page(struct page *page) +{ + return folio_wait_stable(page_folio(page)); +} +EXPORT_SYMBOL_GPL(wait_for_stable_page); diff --git a/mm/page-writeback.c b/mm/page-writeback.c index c8bc78cd0f2b..8b15c44552f7 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -2865,17 +2865,21 @@ int folio_wait_writeback_killable(struct folio *folio) EXPORT_SYMBOL_GPL(folio_wait_writeback_killable); /** - * wait_for_stable_page() - wait for writeback to finish, if necessary. - * @page: The page to wait on. + * folio_wait_stable() - wait for writeback to finish, if necessary. + * @folio: The folio to wait on. * - * This function determines if the given page is related to a backing device - * that requires page contents to be held stable during writeback. If so, then - * it will wait for any pending writeback to complete. + * This function determines if the given folio is related to a backing + * device that requires folio contents to be held stable during writeback. + * If so, then it will wait for any pending writeback to complete. + * + * Context: Sleeps. Must be called in process context and with + * no spinlocks held. Caller should hold a reference on the folio. + * If the folio is not locked, writeback may start again after writeback + * has finished. */ -void wait_for_stable_page(struct page *page) +void folio_wait_stable(struct folio *folio) { - page = thp_head(page); - if (page->mapping->host->i_sb->s_iflags & SB_I_STABLE_WRITES) - wait_on_page_writeback(page); + if (folio->mapping->host->i_sb->s_iflags & SB_I_STABLE_WRITES) + folio_wait_writeback(folio); } -EXPORT_SYMBOL_GPL(wait_for_stable_page); +EXPORT_SYMBOL_GPL(folio_wait_stable);