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=-2.2 required=3.0 tests=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 26E2AC32750 for ; Tue, 13 Aug 2019 14:51:31 +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 F04FF20651 for ; Tue, 13 Aug 2019 14:51:30 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F04FF20651 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:53070 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hxY94-0004LJ-As for qemu-devel@archiver.kernel.org; Tue, 13 Aug 2019 10:51:30 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:43168) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hxY8d-0003qo-Vw for qemu-devel@nongnu.org; Tue, 13 Aug 2019 10:51:04 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hxY8d-0008GD-29 for qemu-devel@nongnu.org; Tue, 13 Aug 2019 10:51:03 -0400 Received: from mx1.redhat.com ([209.132.183.28]:45504) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hxY8a-0008FJ-Ql; Tue, 13 Aug 2019 10:51:01 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 2A59830016E4; Tue, 13 Aug 2019 14:51:00 +0000 (UTC) Received: from [10.3.117.22] (ovpn-117-22.phx2.redhat.com [10.3.117.22]) by smtp.corp.redhat.com (Postfix) with ESMTPS id DABB060BE2; Tue, 13 Aug 2019 14:50:58 +0000 (UTC) To: Max Reitz , Kevin Wolf , Vladimir Sementsov-Ogievskiy References: <20190812181146.26121-1-vsementsov@virtuozzo.com> <35b23140-25d5-627e-7a86-4b50fbc5be52@redhat.com> <3d5fcc5b-cdb0-f028-1ea2-af85850db20e@virtuozzo.com> <15cf7372-826a-0684-d6ad-90deea36959e@virtuozzo.com> <43fb7754-6f94-00f6-6172-70cbb53e787c@virtuozzo.com> <94ccf129-cc7e-2778-7688-fd718f8df249@virtuozzo.com> <20190813115115.GG4663@localhost.localdomain> From: Eric Blake Openpgp: preference=signencrypt Autocrypt: addr=eblake@redhat.com; keydata= xsBNBEvHyWwBCACw7DwsQIh0kAbUXyqhfiKAKOTVu6OiMGffw2w90Ggrp4bdVKmCaEXlrVLU xphBM8mb+wsFkU+pq9YR621WXo9REYVIl0FxKeQo9dyQBZ/XvmUMka4NOmHtFg74nvkpJFCD TUNzmqfcjdKhfFV0d7P/ixKQeZr2WP1xMcjmAQY5YvQ2lUoHP43m8TtpB1LkjyYBCodd+LkV GmCx2Bop1LSblbvbrOm2bKpZdBPjncRNob73eTpIXEutvEaHH72LzpzksfcKM+M18cyRH+nP sAd98xIbVjm3Jm4k4d5oQyE2HwOur+trk2EcxTgdp17QapuWPwMfhaNq3runaX7x34zhABEB AAHNHkVyaWMgQmxha2UgPGVibGFrZUByZWRoYXQuY29tPsLAegQTAQgAJAIbAwULCQgHAwUV CgkICwUWAgMBAAIeAQIXgAUCS8fL9QIZAQAKCRCnoWtKJSdDahBHCACbl/5FGkUqJ89GAjeX RjpAeJtdKhujir0iS4CMSIng7fCiGZ0fNJCpL5RpViSo03Q7l37ss+No+dJI8KtAp6ID+PMz wTJe5Egtv/KGUKSDvOLYJ9WIIbftEObekP+GBpWP2+KbpADsc7EsNd70sYxExD3liwVJYqLc Rw7so1PEIFp+Ni9A1DrBR5NaJBnno2PHzHPTS9nmZVYm/4I32qkLXOcdX0XElO8VPDoVobG6 gELf4v/vIImdmxLh/w5WctUpBhWWIfQDvSOW2VZDOihm7pzhQodr3QP/GDLfpK6wI7exeu3P pfPtqwa06s1pae3ad13mZGzkBdNKs1HEm8x6zsBNBEvHyWwBCADGkMFzFjmmyqAEn5D+Mt4P zPdO8NatsDw8Qit3Rmzu+kUygxyYbz52ZO40WUu7EgQ5kDTOeRPnTOd7awWDQcl1gGBXgrkR pAlQ0l0ReO57Q0eglFydLMi5bkwYhfY+TwDPMh3aOP5qBXkm4qIYSsxb8A+i00P72AqFb9Q7 3weG/flxSPApLYQE5qWGSXjOkXJv42NGS6o6gd4RmD6Ap5e8ACo1lSMPfTpGzXlt4aRkBfvb NCfNsQikLZzFYDLbQgKBA33BDeV6vNJ9Cj0SgEGOkYyed4I6AbU0kIy1hHAm1r6+sAnEdIKj cHi3xWH/UPrZW5flM8Kqo14OTDkI9EtlABEBAAHCwF8EGAEIAAkFAkvHyWwCGwwACgkQp6Fr SiUnQ2q03wgAmRFGDeXzc58NX0NrDijUu0zx3Lns/qZ9VrkSWbNZBFjpWKaeL1fdVeE4TDGm I5mRRIsStjQzc2R9b+2VBUhlAqY1nAiBDv0Qnt+9cLiuEICeUwlyl42YdwpmY0ELcy5+u6wz mK/jxrYOpzXKDwLq5k4X+hmGuSNWWAN3gHiJqmJZPkhFPUIozZUCeEc76pS/IUN72NfprZmF Dp6/QDjDFtfS39bHSWXKVZUbqaMPqlj/z6Ugk027/3GUjHHr8WkeL1ezWepYDY7WSoXwfoAL 2UXYsMAr/uUncSKlfjvArhsej0S4zbqim2ZY6S8aRWw94J3bSvJR+Nwbs34GPTD4Pg== Organization: Red Hat, Inc. Message-ID: Date: Tue, 13 Aug 2019 09:50:57 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="WP7qUv4pR239u3ifUkmHyjLOheKybWQN2" X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.45]); Tue, 13 Aug 2019 14:51:00 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: Re: [Qemu-devel] [PATCH 0/2] deal with BDRV_BLOCK_RAW 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: "qemu-devel@nongnu.org" , "qemu-block@nongnu.org" , Denis Lunev Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --WP7qUv4pR239u3ifUkmHyjLOheKybWQN2 Content-Type: multipart/mixed; boundary="skKlCief9Uadskosmg6kXP34Lk9uUaoku"; protected-headers="v1" From: Eric Blake To: Max Reitz , Kevin Wolf , Vladimir Sementsov-Ogievskiy Cc: "qemu-devel@nongnu.org" , "qemu-block@nongnu.org" , Denis Lunev Message-ID: Subject: Re: [PATCH 0/2] deal with BDRV_BLOCK_RAW References: <20190812181146.26121-1-vsementsov@virtuozzo.com> <35b23140-25d5-627e-7a86-4b50fbc5be52@redhat.com> <3d5fcc5b-cdb0-f028-1ea2-af85850db20e@virtuozzo.com> <15cf7372-826a-0684-d6ad-90deea36959e@virtuozzo.com> <43fb7754-6f94-00f6-6172-70cbb53e787c@virtuozzo.com> <94ccf129-cc7e-2778-7688-fd718f8df249@virtuozzo.com> <20190813115115.GG4663@localhost.localdomain> In-Reply-To: --skKlCief9Uadskosmg6kXP34Lk9uUaoku Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 8/13/19 9:31 AM, Max Reitz wrote: > On 13.08.19 13:51, Kevin Wolf wrote: >=20 > [...] >=20 >> Hm... This is a mess. :-) >=20 > Just out of curiosity: Why? >=20 > Aren=E2=80=99t there only two things we really need from the block_stat= us > infrastructure? >=20 > (1) Whether something is allocated in the given layer of the backing ch= ain, (1)(a) - is it allocated in this layer (1)(b) - is it allocated in any backing layer >=20 > (2) Whether we know that a given range reads as zeroes. >=20 > Do we really need anything else? qemu-img map needs: (3) What host-relative offset, if any, corresponds to a given guest-visible offset. I also need to find time to revisit my proposed patches on block_status alignment - there are some cases where we want to ensure that one layer with large granularity does not pick up mid-granularity changes in status read from a backing layer with smaller granularity. --=20 Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3226 Virtualization: qemu.org | libvirt.org --skKlCief9Uadskosmg6kXP34Lk9uUaoku-- --WP7qUv4pR239u3ifUkmHyjLOheKybWQN2 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEccLMIrHEYCkn0vOqp6FrSiUnQ2oFAl1SzlEACgkQp6FrSiUn Q2oT+Qf/cm8C8FV/8incpRzeiaTpIR7YECM95jWjRzSldVHCYRjXgVFkVCLUX42D VWItl6iwn0W0AgW8DYwkqW5FrgTTyqVrRUPnz1RltOCOgnBwFFFTjtmHpN4unfWt a7LY//p+SUga7imqNdaX7Tn2tT28C74o5yjyEhDg+MsziLuGUm6LbZV7gRw3mGVv tdVixt17+9sIPEmaV0CEXq6aQIMNpNkJUlTTZrjhIRJIBO2tAA3KSq0nNJRy9zy5 ZNWrepE3V76kbvWGRGVYDASTxwx7Mk+BTE89psiN0VEdFVcCwBEsgkIDSR+EHS3o aT2uXfzmivJG0tlHoCnaA3SEtshflQ== =VOsQ -----END PGP SIGNATURE----- --WP7qUv4pR239u3ifUkmHyjLOheKybWQN2--