From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:36745) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fQrsa-0003J1-PK for qemu-devel@nongnu.org; Thu, 07 Jun 2018 06:10:53 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fQrsX-0008AQ-Je for qemu-devel@nongnu.org; Thu, 07 Jun 2018 06:10:52 -0400 Date: Thu, 7 Jun 2018 11:10:46 +0100 From: Stefan Hajnoczi Message-ID: <20180607101046.GC19032@stefanha-x1.localdomain> References: <1487347224-8667-1-git-send-email-pl@kamp.de> <20170220145011.GJ21255@stefanha-x1.localdomain> <73412b92-353d-7109-cfbe-9c61bf91e7eb@kamp.de> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="xo44VMWPx7vlQ2+2" Content-Disposition: inline In-Reply-To: Subject: Re: [Qemu-devel] [Qemu-block] [RFC PATCH V4] qemu-img: make convert async List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Vladimir Sementsov-Ogievskiy Cc: Peter Lieven , kwolf@redhat.com, famz@redhat.com, qemu-devel@nongnu.org, qemu-block@nongnu.org, mreitz@redhat.com --xo44VMWPx7vlQ2+2 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Jun 01, 2018 at 07:16:14PM +0300, Vladimir Sementsov-Ogievskiy wrot= e: > 20.02.2017 17:59, Peter Lieven wrote: > > Am 20.02.2017 um 15:50 schrieb Stefan Hajnoczi: > > > On Fri, Feb 17, 2017 at 05:00:24PM +0100, Peter Lieven wrote: > > > > this is something I have been thinking about for almost 2 years now. > > > > we heavily have the following two use cases when using qemu-img > > > > convert. > > > >=20 > > > >=20 >=20 > [...] >=20 > > > Does this patch work with compressed images?=A0 Especially the > > > out-of-order write mode may be problematic with a compressed qcow2 > > > image. > >=20 > > It does, but you are right, out-of-order writes and compression should > > be mutually exclusive. >=20 >=20 > Sorry for being late, but can you please explain to me, why? There are image format-specific limitations on compressed writes. For some reason I thought they were append-only in qcow2, but I was wrong. Stefan --xo44VMWPx7vlQ2+2 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEcBAEBAgAGBQJbGQSmAAoJEJykq7OBq3PIUcUH/A+PCvtvAdVGkIZ+n5TGd2zu BxAoTp/q29inNLD5tcoC3a8HIadgen4GvoslKVqGGfS4Ghep+qUxAW5q/QvhMH2o keHQXAM0A2U2hwZLzmPy5vmOBGTIUL0PoUFOxUFANfSila+kVLTfo5IQ2i/MsiAv kSfhaGcaJXkukfLHdRLL+3mlGenVXU3Vg1aLgAKXxNEbvnCX1U1KkHhYQyGwIxFL 0G+tk1dcH9uykzWq4BLJLT7acr4CSwQ/TcySeQT/XYPOoQMgou9ertyPEFL80fDZ 1YECBWM+Rp2lUqgdFVrmYSkJSvPMcZQ7l0GVDqAHhO67f4yxh5Yuvqr/N6aSyKI= =c+Oj -----END PGP SIGNATURE----- --xo44VMWPx7vlQ2+2--