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=-2.1 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no 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 AB730ECE58D for ; Mon, 14 Oct 2019 08:40:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 769F720650 for ; Mon, 14 Oct 2019 08:40:28 +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="Cm+smAvq" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730538AbfJNIk2 (ORCPT ); Mon, 14 Oct 2019 04:40:28 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:41194 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730443AbfJNIk1 (ORCPT ); Mon, 14 Oct 2019 04:40:27 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: 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=2gy955Uqq63ZjbU+vRHD094tE85UQvetN3oFV5jJfwc=; b=Cm+smAvqWaa00v+wmPEn5jh3n QUVIT5Kzd0V12wUiND2zUq1Vl2QDJ5amb5nalQN5GdfoVR20Dh0v1aElo8IXu7A7ZMhoIcPTtEdtV krdxDC148VEdY3U97N9jVuami18kQzgnMmPq97hHUgroXdB0bBJudmdHVQj0959AVucm395fQ8BZb RcwoZ0SngCzWEh9ieNrCH+pdJFeUHgVUmO5cKuF4LF8Rc/vhGovR1X4aC6swdpD7y8itVl5bSC/5C EK2K/x3XBRKoqIWzGMHJPZVXKmg7zuYZDcup33rInu89iicplLjANh7hPtEX/PsgDqMJQ2G2KLHEK Lgo6krLcw==; Received: from hch by bombadil.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1iJvtz-0002pq-Ao; Mon, 14 Oct 2019 08:40:27 +0000 Date: Mon, 14 Oct 2019 01:40:27 -0700 From: Christoph Hellwig To: Pingfan Liu Cc: linux-xfs@vger.kernel.org, "Darrick J. Wong" , Dave Chinner , Eric Sandeen , Hari Bathini , linuxppc-dev@lists.ozlabs.org Subject: Re: [PATCH] xfs: introduce "metasync" api to sync metadata to fsblock Message-ID: <20191014084027.GA3593@infradead.org> References: <1570977420-3944-1-git-send-email-kernelfans@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1570977420-3944-1-git-send-email-kernelfans@gmail.com> User-Agent: Mutt/1.12.1 (2019-06-15) 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 On Sun, Oct 13, 2019 at 10:37:00PM +0800, Pingfan Liu wrote: > When using fadump (fireware assist dump) mode on powerpc, a mismatch > between grub xfs driver and kernel xfs driver has been obsevered. Note: > fadump boots up in the following sequence: fireware -> grub reads kernel > and initramfs -> kernel boots. This isn't something new. To fundamentally fix this you need to implement (in-memory) log recovery in grub. That is the only really safe long-term solutioin. But the equivalent of your patch you can already get by freezing and unfreezing the file system using the FIFREEZE and FITHAW ioctls. And if my memory is serving me correctly Dave has been preaching that to the bootloader folks for a long time, but apparently without visible results.