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=-0.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 5D85EC433E0 for ; Mon, 15 Jun 2020 13:26:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2CDFE2076A for ; Mon, 15 Jun 2020 13:26:36 +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="qGfsSHiN" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730253AbgFON0f (ORCPT ); Mon, 15 Jun 2020 09:26:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56408 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730058AbgFON0e (ORCPT ); Mon, 15 Jun 2020 09:26:34 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2EDEDC061A0E; Mon, 15 Jun 2020 06:26:34 -0700 (PDT) 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:To:From:Date:Sender:Reply-To:Cc: Content-Transfer-Encoding:Content-ID:Content-Description; bh=ksyETq/TLH9AuQNxtfQV+6S3Mb7fK99JQIayoY8bWbY=; b=qGfsSHiNyPTDCAXdQglvTSpwTa WvQvaz0qyd+Yy1bKZc5qzVtqRvghyALrT73YoNRo0ytUuCTwv933jNdC6IUJAnNxA3TVFvgE9/w/j ifFRrmBV6w+lcrs8yIPRVE4F6CdvWjG38ZkkO0iAVq2gAtjChbTEQwq2DUIq5zf9kmQwAtqzuNPTP Kl2KtSW7dhBp29DjA6RLF3ND4wZpHMMMGVX1vxhtEaz0DPGO7bITH7PL8MQq4hJv8pEeU1hkgtvV3 IsVm5AVysAYB3YfzFN4XAqQRahLYoFjhkego4zaAuMKydQwHcD84iA4eFIZEgg7uaF7Udw2JQfpyp pCOD5wFw==; Received: from hch by bombadil.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1jkp8C-0001V3-21; Mon, 15 Jun 2020 13:26:32 +0000 Date: Mon, 15 Jun 2020 06:26:32 -0700 From: Christoph Hellwig To: dsterba@suse.cz, Linus Torvalds , David Sterba , linux-btrfs , Linux Kernel Mailing List Subject: Re: [GIT PULL] Btrfs updates for 5.8, part 2 Message-ID: <20200615132632.GA27848@infradead.org> References: <20200615125701.GY27795@twin.jikos.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200615125701.GY27795@twin.jikos.cz> 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 On Mon, Jun 15, 2020 at 02:57:01PM +0200, David Sterba wrote: > On Sun, Jun 14, 2020 at 09:50:17AM -0700, Linus Torvalds wrote: > > On Sun, Jun 14, 2020 at 4:56 AM David Sterba wrote: > > > > > > Reverts are not great, but under current circumstances I don't see > > > better options. > > > > Pulled. Are people discussing how to make iomap work for everybody? > > It's a bit sad if we can't have the major filesystems move away from > > the old buffer head interfaces to a common more modern one.. > > Yes, it's fixable and we definitely want to move to iomap. The direct to > buffered fallback would fix one of the problems, but this would also > mean that xfs would start doing that. Such change should be treated more > like a feature development than a bugfix, imposed by another filesystem, > and xfs people rightfully complained. We can trivially key that off a flag at least for 5.8. I suspect the fallback actually is the right thing for XFS in the long run for that particular case.