From nobody Wed Dec 17 05:39:22 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1534337915571472.1244068254613; Wed, 15 Aug 2018 05:58:35 -0700 (PDT) Received: from localhost ([::1]:49472 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fpvNe-00067q-BV for importer@patchew.org; Wed, 15 Aug 2018 08:58:30 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:51951) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fpvLV-0004S6-ME for qemu-devel@nongnu.org; Wed, 15 Aug 2018 08:56:20 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fpvLT-00010d-4S for qemu-devel@nongnu.org; Wed, 15 Aug 2018 08:56:16 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:51760 helo=mx1.redhat.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1fpvL2-0000N6-At; Wed, 15 Aug 2018 08:55:48 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id ECE3B7A7E7; Wed, 15 Aug 2018 12:55:47 +0000 (UTC) Received: from localhost.localdomain.com (ovpn-117-3.ams2.redhat.com [10.36.117.3]) by smtp.corp.redhat.com (Postfix) with ESMTP id 252611018E; Wed, 15 Aug 2018 12:55:47 +0000 (UTC) From: Kevin Wolf To: qemu-block@nongnu.org Date: Wed, 15 Aug 2018 14:55:22 +0200 Message-Id: <20180815125537.10651-7-kwolf@redhat.com> In-Reply-To: <20180815125537.10651-1-kwolf@redhat.com> References: <20180815125537.10651-1-kwolf@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.11.54.5 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.2]); Wed, 15 Aug 2018 12:55:47 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.2]); Wed, 15 Aug 2018 12:55:47 +0000 (UTC) for IP:'10.11.54.5' DOMAIN:'int-mx05.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'kwolf@redhat.com' RCPT:'' Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 66.187.233.73 Subject: [Qemu-devel] [PULL 06/21] luks: Allow share-rw=on X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, peter.maydell@linaro.org, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RDMRC_1 RSF_0 Z_629925259 SPT_0 Content-Type: text/plain; charset="utf-8" From: Fam Zheng Format drivers such as qcow2 don't allow sharing the same image between two QEMU instances in order to prevent image corruptions, because of metadata cache. LUKS driver don't modify metadata except for when creating image, so it is safe to relax the permission. This makes share-rw=3Don property work on virtual devices. Suggested-by: Daniel P. Berrang=C3=A9 Signed-off-by: Fam Zheng Reviewed-by: Daniel P. Berrang=C3=A9 Signed-off-by: Kevin Wolf --- block/crypto.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/block/crypto.c b/block/crypto.c index 146d81c90a..33ee01bebd 100644 --- a/block/crypto.c +++ b/block/crypto.c @@ -627,7 +627,9 @@ BlockDriver bdrv_crypto_luks =3D { .bdrv_probe =3D block_crypto_probe_luks, .bdrv_open =3D block_crypto_open_luks, .bdrv_close =3D block_crypto_close, - .bdrv_child_perm =3D bdrv_format_default_perms, + /* This driver doesn't modify LUKS metadata except when creating image. + * Allow share-rw=3Don as a special case. */ + .bdrv_child_perm =3D bdrv_filter_default_perms, .bdrv_co_create =3D block_crypto_co_create_luks, .bdrv_co_create_opts =3D block_crypto_co_create_opts_luks, .bdrv_co_truncate =3D block_crypto_co_truncate, --=20 2.13.6