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=-5.0 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,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 E0D07C433F5 for ; Tue, 7 Sep 2021 17:53:11 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 6268F61103 for ; Tue, 7 Sep 2021 17:53:11 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 6268F61103 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=nongnu.org Received: from localhost ([::1]:58320 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mNfHS-0008IP-E5 for qemu-devel@archiver.kernel.org; Tue, 07 Sep 2021 13:53:10 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:49614) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mNfGn-0007dZ-7F for qemu-devel@nongnu.org; Tue, 07 Sep 2021 13:52:29 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:21998) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mNfGj-0000OQ-90 for qemu-devel@nongnu.org; Tue, 07 Sep 2021 13:52:28 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1631037143; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=QFO+6Ir+tiNj6TuXNlJVCTAyo2od91mIiQTbnqv38us=; b=VjAKLpkxjpfmjLBY6KK3Yr0mTeCl3hqJ1pLpMUrZMBYhr0KOAj7Lbwe6mn5nW96qEH/QBy AcwW4gvtHawxXnxtkTfzZVf742aKvvXmuv6P89wPCIEF9KGXnX4Z7K+DrZMTdBfhcaM8ls U2m7/RF82+vZOqc4VF0XC5c2eoO+LVA= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-220-RpClBSMDPIiAtlZNiLXx2w-1; Tue, 07 Sep 2021 13:52:22 -0400 X-MC-Unique: RpClBSMDPIiAtlZNiLXx2w-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id C127584A5EC for ; Tue, 7 Sep 2021 17:52:21 +0000 (UTC) Received: from redhat.com (ovpn-112-95.phx2.redhat.com [10.3.112.95]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 449A217258; Tue, 7 Sep 2021 17:52:18 +0000 (UTC) Date: Tue, 7 Sep 2021 12:52:16 -0500 From: Eric Blake To: Hanna Reitz Subject: Re: [qemu-web PATCH] Update FUSE block export blog post Message-ID: <20210907175216.dze5fvinpo5pxlt2@redhat.com> References: <20210906162916.21714-1-hreitz@redhat.com> MIME-Version: 1.0 In-Reply-To: <20210906162916.21714-1-hreitz@redhat.com> User-Agent: NeoMutt/20210205-739-420e15 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=eblake@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=170.10.133.124; envelope-from=eblake@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -31 X-Spam_score: -3.2 X-Spam_bar: --- X-Spam_report: (-3.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.391, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Klaus Kiwi , Paolo Bonzini , Thomas Huth , qemu-devel@nongnu.org, Stefan Hajnoczi Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Mon, Sep 06, 2021 at 06:29:16PM +0200, Hanna Reitz wrote: > Because I forgot to CC Thomas on the discussion adding this post, it was > merged prematurely. This patch updates the post to incorporate the > feedback I received on it: > Overall, nice! I see it's already live, but another tweak you might want to make: > +## File mounts > > -A perhaps little-known fact is that, on Linux, filesystems do not need to have > -a root directory, they only need to have a root node. A filesystem that only > -provides a single regular file is perfectly valid. > +To transparently translate a file into a different format, like we did above, we > +make use of two little-known facts about filesystems and the VFS on Linux. The > +first one of these we can explain immediately, for the second one we will need > +some more information about how FUSE exports work, so that secret will be lifted s/lifted/revealed/ > +later (down in the “Mounting an image on itself” section). > + -- Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3266 Virtualization: qemu.org | libvirt.org