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 Received: from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E1968C624A4 for ; Thu, 3 Sep 2026 13:37:46 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists1p.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1x27cy-0000x1-1V; Thu, 03 Sep 2026 09:37:16 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1x27cw-0000ws-Ex for qemu-devel@nongnu.org; Thu, 03 Sep 2026 09:37:14 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1x27cu-0004Hz-Ty for qemu-devel@nongnu.org; Thu, 03 Sep 2026 09:37:14 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1788442632; 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: in-reply-to:in-reply-to:references:references; bh=WumqCSDChyQmqDeur0vStfhIudXGg6R/C1TJURXM+bg=; b=i65wHCuoNnMBqfbnmtMAHZEtupL8z7OmV0OIz6PE7zUKkTClqBCzCYoxVDg2DIShyAAThN WuzBLQ4WodOgDOaWqoIysGQKRvOEY1Mkq6zKH9xqCksuUd2vGKJssHEQzB45nbXGN7bgqP J0WRW/f75ZjIo1+RI1VJ+4lS83WKqf4= Received: from mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-86-EXLONfYRNXmBhu41tM2urQ-1; Thu, 03 Sep 2026 09:37:09 -0400 X-MC-Unique: EXLONfYRNXmBhu41tM2urQ-1 X-Mimecast-MFC-AGG-ID: EXLONfYRNXmBhu41tM2urQ_1788442628 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id DED56185FBBB; Thu, 3 Sep 2026 13:37:07 +0000 (UTC) Received: from localhost (headnet05.pony-001.prod.iad2.dc.redhat.com [10.2.32.117]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 7B37E3000239; Thu, 3 Sep 2026 13:37:07 +0000 (UTC) Date: Thu, 3 Sep 2026 09:37:06 -0400 From: Stefan Hajnoczi To: Huiba Li Cc: qemu-block@nongnu.org, qemu-devel@nongnu.org, Kevin Wolf , Hanna Reitz Subject: Re: [RFC] block: add an overlaybd image format driver Message-ID: <20260903133706.GA825275@fedora> References: <20260902115439.GA754231@fedora> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="JitZOx6Kl4oioAUg" Content-Disposition: inline In-Reply-To: X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 Received-SPF: pass client-ip=170.10.133.124; envelope-from=stefanha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org --JitZOx6Kl4oioAUg Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Sep 03, 2026 at 05:27:28PM +0800, Huiba Li wrote: > > One thing I noticed is that the append-only format used for the upper > > write layer is not documented. >=20 > I have added the spec for writable layers: > https://github.com/containerd/overlaybd/pull/451/changes Thanks, that clarifies things. Stefan --JitZOx6Kl4oioAUg Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iQEzBAEBCgAdFiEEhpWov9P5fNqsNXdanKSrs4Grc8gFAmqZeAIACgkQnKSrs4Gr c8gcSAf/fKdG2ATPV98p33049unic/uQpKpo+ECVzNIyHxAQ8SGtmOAwsqfxlAHm dX/QeFNPZdSoMdanLYMtdPilbdHwa0ZggjaBfK8AQG0NbCqAdBeSw5mATYGqCYfc WRbvELGq5cvTbYEgCHVkk6d4iLSiY8TgoGbqEVExCoustog8wZx0kao5Kkp6RcJ5 f8u3qd5gSgu9OxO+PcJjIAg4IX+F+ncJMlc4xUa26fhGy4VEsP64scpwytV9ICFo U1F+M2DHSiR1qWGl0qKhY9hUKMWDGepDVZmSs1nV7Ur/+1WDwBIdz6cSqNdyLSQo 3Asayf/94+wYiAzxOvbWxb/xltXjvA== =S8+0 -----END PGP SIGNATURE----- --JitZOx6Kl4oioAUg--