From patchwork Wed May 9 07:48:25 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 10388545 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 429E960170 for ; Wed, 9 May 2018 07:50:55 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3517328E05 for ; Wed, 9 May 2018 07:50:55 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 29CE028E65; Wed, 9 May 2018 07:50:55 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI, T_DKIM_INVALID autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CA42828E05 for ; Wed, 9 May 2018 07:50:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933946AbeEIHu1 (ORCPT ); Wed, 9 May 2018 03:50:27 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:53544 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933889AbeEIHu0 (ORCPT ); Wed, 9 May 2018 03:50:26 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=References:In-Reply-To:Message-Id: Date:Subject:Cc:To:From:Sender:Reply-To:MIME-Version:Content-Type: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=RnQ40Y8icT7VZNAQr7jMxJV0RGyk1YQlG1KrGvV7Kvc=; b=Hl81kAcgP1eBT2eLvyFHuDeXG dPs27OsNiItw5YcFsZDdejekmPvhbDISZrh+RvA0ez4seEDGkhnaArIxFBrvLaGjpaijKhD21VDde /E92y7h1143qt4GUN1X3UNHN3+ygn4Z//ESsho66m2fOvtyr+XjN4YTmpX/MW/6jh7YKlycLHalKk rMkT98+3rfzZUPQJZFJdgAWkUi2WOlMlalncNeTeMtrEcJKLGZuaBZDA9V70nJiEjHUZcwCsq+l5R kGWaPCcjyfUaNsBrVkdxcv8GQ233nW/0l2/YWHKld9MrGlicgHF6H5aho1gn8BpYLtsNsUbYPfC5G ocsEexi6A==; Received: from 213-225-15-246.nat.highway.a1.net ([213.225.15.246] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1fGJri-0002g8-K4; Wed, 09 May 2018 07:50:23 +0000 From: Christoph Hellwig To: linux-xfs@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 28/33] xfs: refactor the tail of xfs_writepage_map Date: Wed, 9 May 2018 09:48:25 +0200 Message-Id: <20180509074830.16196-29-hch@lst.de> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180509074830.16196-1-hch@lst.de> References: <20180509074830.16196-1-hch@lst.de> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-xfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Rejuggle how we deal with the different error vs non-error and have ioends vs not have ioend cases to keep the fast path streamlined, and the duplicate code at a minimum. Signed-off-by: Christoph Hellwig --- fs/xfs/xfs_aops.c | 65 +++++++++++++++++++++++------------------------ 1 file changed, 32 insertions(+), 33 deletions(-) diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c index 6b39792270aa..dc82d4e71a64 100644 --- a/fs/xfs/xfs_aops.c +++ b/fs/xfs/xfs_aops.c @@ -906,7 +906,14 @@ xfs_writepage_map( * submission of outstanding ioends on the writepage context so they are * treated correctly on error. */ - if (count) { + if (unlikely(error)) { + if (!count) { + xfs_aops_discard_page(page); + ClearPageUptodate(page); + unlock_page(page); + goto done; + } + /* * If the page was not fully cleaned, we need to ensure that the * higher layers come back to it correctly. That means we need @@ -915,43 +922,35 @@ xfs_writepage_map( * so another attempt to write this page in this writeback sweep * will be made. */ - if (error) { - set_page_writeback_keepwrite(page); - } else { - clear_page_dirty_for_io(page); - set_page_writeback(page); - } - unlock_page(page); - - /* - * Preserve the original error if there was one, otherwise catch - * submission errors here and propagate into subsequent ioend - * submissions. - */ - list_for_each_entry_safe(ioend, next, &submit_list, io_list) { - int error2; - - list_del_init(&ioend->io_list); - error2 = xfs_submit_ioend(wbc, ioend, error); - if (error2 && !error) - error = error2; - } - } else if (error) { - xfs_aops_discard_page(page); - ClearPageUptodate(page); - unlock_page(page); + set_page_writeback_keepwrite(page); } else { - /* - * We can end up here with no error and nothing to write if we - * race with a partial page truncate on a sub-page block sized - * filesystem. In that case we need to mark the page clean. - */ clear_page_dirty_for_io(page); set_page_writeback(page); - unlock_page(page); - end_page_writeback(page); } + unlock_page(page); + + /* + * Preserve the original error if there was one, otherwise catch + * submission errors here and propagate into subsequent ioend + * submissions. + */ + list_for_each_entry_safe(ioend, next, &submit_list, io_list) { + int error2; + + list_del_init(&ioend->io_list); + error2 = xfs_submit_ioend(wbc, ioend, error); + if (error2 && !error) + error = error2; + } + + /* + * We can end up here with no error and nothing to write if we race with + * a partial page truncate on a sub-page block sized filesystem. + */ + if (!count) + end_page_writeback(page); +done: mapping_set_error(page->mapping, error); return error; }