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=-8.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 0F23CC48BD7 for ; Thu, 27 Jun 2019 10:49:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C6FB22086D for ; Thu, 27 Jun 2019 10:49:05 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="Gm6dKltS" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726795AbfF0KtF (ORCPT ); Thu, 27 Jun 2019 06:49:05 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:52104 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726748AbfF0KtC (ORCPT ); Thu, 27 Jun 2019 06:49:02 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.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: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=2yvHT618NnovgFgJsjPpwcRncjLi75iioGv1+Lk+glw=; b=Gm6dKltSVJUY2JooJvnqOHubwq RxVZ1Pvw8jYycr4/bEM+4rbq24oMAayMyj9SzYDljkAOpxmu6irXFxWOvGG5/ZP7h16MTt8Jy0vBf xi38zY0wFgbIaifMrB/EmbAC13tk0xEfGomZL+9Sn0HYRp8E0hWc1EpzsAYoLdyq0Cx8sycAoi2tI 4btHhONtwu1yIaBWj7rih5GajxOTA3JNYijrBu2131yyvURrSWRX0s1h10Lj1uwcIUF8PhEuj5tHi +Aqit2geKwD45FLCp/+P5SyzY7dEqxVekkba5MWGplLRovoiq9NKytlin5+1nBra44WMz9ZpZclVf JNEe2VMg==; Received: from 089144214055.atnat0023.highway.a1.net ([89.144.214.55] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hgRxb-000574-Jw; Thu, 27 Jun 2019 10:49:00 +0000 From: Christoph Hellwig To: "Darrick J . Wong" Cc: Damien Le Moal , Andreas Gruenbacher , linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 07/13] xfs: allow merging ioends over append boundaries Date: Thu, 27 Jun 2019 12:48:30 +0200 Message-Id: <20190627104836.25446-8-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190627104836.25446-1-hch@lst.de> References: <20190627104836.25446-1-hch@lst.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org There is no real problem merging ioends that go beyond i_size into an ioend that doesn't. We just need to move the append transaction to the base ioend. Also use the opportunity to use a real error code instead of the magic 1 to cancel the transactions, and write a comment explaining the scheme. Signed-off-by: Christoph Hellwig --- fs/xfs/xfs_aops.c | 28 +++++++++++++++++++++------- 1 file changed, 21 insertions(+), 7 deletions(-) diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c index 8b3070a40245..4ef8343c3759 100644 --- a/fs/xfs/xfs_aops.c +++ b/fs/xfs/xfs_aops.c @@ -314,11 +314,28 @@ xfs_ioend_can_merge( return false; if (ioend->io_offset + ioend->io_size != next->io_offset) return false; - if (xfs_ioend_is_append(ioend) != xfs_ioend_is_append(next)) - return false; return true; } +/* + * If the to be merged ioend has a preallocated transaction for file + * size updates we need to ensure the ioend it is merged into also + * has one. If it already has one we can simply cancel the transaction + * as it is guaranteed to be clean. + */ +static void +xfs_ioend_merge_append_transactions( + struct xfs_ioend *ioend, + struct xfs_ioend *next) +{ + if (!ioend->io_append_trans) { + ioend->io_append_trans = next->io_append_trans; + next->io_append_trans = NULL; + } else { + xfs_setfilesize_ioend(next, -ECANCELED); + } +} + /* Try to merge adjacent completions. */ STATIC void xfs_ioend_try_merge( @@ -327,7 +344,6 @@ xfs_ioend_try_merge( { struct xfs_ioend *next_ioend; int ioend_error; - int error; if (list_empty(more_ioends)) return; @@ -341,10 +357,8 @@ xfs_ioend_try_merge( break; list_move_tail(&next_ioend->io_list, &ioend->io_list); ioend->io_size += next_ioend->io_size; - if (ioend->io_append_trans) { - error = xfs_setfilesize_ioend(next_ioend, 1); - ASSERT(error == 1); - } + if (next_ioend->io_append_trans) + xfs_ioend_merge_append_transactions(ioend, next_ioend); } } -- 2.20.1