From patchwork Sat Mar 20 05:41:00 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Wilcox X-Patchwork-Id: 12152297 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 BED07C433E0 for ; Sat, 20 Mar 2021 05:45:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9CF2E6196E for ; Sat, 20 Mar 2021 05:45:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229484AbhCTFpN (ORCPT ); Sat, 20 Mar 2021 01:45:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54522 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230243AbhCTFov (ORCPT ); Sat, 20 Mar 2021 01:44:51 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B85D6C061762; Fri, 19 Mar 2021 22:44:50 -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=30IifAMV+9SjIPC06TX4qxHTMbVci0D9vhNY5D2kHrs=; b=czb/YXKSnUYK8E7i9dfNKYPFCQ Bo0w/B31yKWGWKEfLgYRqGJcpslePdCRzM65+LobyOnxm878IqJ5aP4kqtz2Mz6swLcXknMWn1CXK V2TTPSLV689am4Ks9zoQ3Gc9KB4t97OKCFL7I935srf45kKomdM8nCDH4PR/fHMbUlTViy3Z+CM7F TMQ27Xf4eA2dLOHFz2PmxsK4tFhngMbUpAkMiZB8NpJpALtBQgqNZ3EXyGy2DpPiLdLKDMG47SRKt ZUjVBCC/7GXz+A3V4sPZnUJa/I4A8akTZHWVFumrUCHgzZ8EcT8rpD09jLjctmXiXWonmqZXvZwNf 6yyPZ17Q==; Received: from willy by casper.infradead.org with local (Exim 4.94 #2 (Red Hat Linux)) id 1lNUOu-005Shq-7j; Sat, 20 Mar 2021 05:43:53 +0000 From: "Matthew Wilcox (Oracle)" To: linux-mm@kvack.org Cc: "Matthew Wilcox (Oracle)" , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-cachefs@redhat.com, linux-afs@lists.infradead.org Subject: [PATCH v5 23/27] mm/writeback: Add wait_for_stable_folio Date: Sat, 20 Mar 2021 05:41:00 +0000 Message-Id: <20210320054104.1300774-24-willy@infradead.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210320054104.1300774-1-willy@infradead.org> References: <20210320054104.1300774-1-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. wait_for_stable_folio() 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) --- include/linux/pagemap.h | 1 + mm/folio-compat.c | 6 ++++++ mm/page-writeback.c | 17 ++++++++--------- 3 files changed, 15 insertions(+), 9 deletions(-) diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index a6adf69ea5c5..c92782b77d98 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -813,6 +813,7 @@ int wait_on_folio_writeback_killable(struct folio *folio); void end_page_writeback(struct page *page); void end_folio_writeback(struct folio *folio); void wait_for_stable_page(struct page *page); +void wait_for_stable_folio(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 6aadecc39fba..335594fe414e 100644 --- a/mm/folio-compat.c +++ b/mm/folio-compat.c @@ -29,3 +29,9 @@ void wait_on_page_writeback(struct page *page) return wait_on_folio_writeback(page_folio(page)); } EXPORT_SYMBOL_GPL(wait_on_page_writeback); + +void wait_for_stable_page(struct page *page) +{ + return wait_for_stable_folio(page_folio(page)); +} +EXPORT_SYMBOL_GPL(wait_for_stable_page); diff --git a/mm/page-writeback.c b/mm/page-writeback.c index a08e77abcf12..c222f88cf06b 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -2862,17 +2862,16 @@ int wait_on_folio_writeback_killable(struct folio *folio) EXPORT_SYMBOL_GPL(wait_on_folio_writeback_killable); /** - * wait_for_stable_page() - wait for writeback to finish, if necessary. - * @page: The page to wait on. + * wait_for_stable_folio() - 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 + * 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. */ -void wait_for_stable_page(struct page *page) +void wait_for_stable_folio(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->page.mapping->host->i_sb->s_iflags & SB_I_STABLE_WRITES) + wait_on_folio_writeback(folio); } -EXPORT_SYMBOL_GPL(wait_for_stable_page); +EXPORT_SYMBOL_GPL(wait_for_stable_folio);