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[130.117.225.111]) by mx.google.com with ESMTPS id ffacd0b85a97d-48e3807439csi4252672f8f.248.2026.10.23.06.20.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 23 Oct 2026 06:20:12 -0700 (PDT) Received-SPF: pass (google.com: domain of alexander.ivanov@virtuozzo.com designates 130.117.225.111 as permitted sender) client-ip=130.117.225.111; Authentication-Results: mx.google.com; dkim=pass header.i=@virtuozzo.com header.s=relay header.b="nO63/I34"; spf=pass (google.com: domain of alexander.ivanov@virtuozzo.com designates 130.117.225.111 as permitted sender) smtp.mailfrom=alexander.ivanov@virtuozzo.com; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=virtuozzo.com DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=virtuozzo.com; s=relay; h=MIME-Version:Message-ID:Date:Subject:From: Content-Type; bh=7AA4Sjgutwm5POuv7M6LEhA0CJ3KrlhyHQsoYNt2mc4=; b=nO63/I34j9/n nCqgMcvFU+tzNwAzPbV2GxkQSqQkZA89E73yX8C3Sl+bvYo6mlaUfsDmUAhNS3ZDEmLoKpvf8dCN8 C3E+aD+jD45r2Jaw//7yuHvxb+PAa2u36ethwTIlUaUzXCwU4HeQtwSKji7CTovM3+Bosqp6DUlPU cjmeGg0PsEb1fPwmNigJDSXZ88by0m3qFiJ/SCGlsnBgSOFvIquBNkhpcTijq12T2xxBxm6X+HL09 7ypl1ZnEWma3t6jNNR8/lwhWbexxWpZezYPpTUqQsgoFEUhksZN52+4ccHYJMwIp6nRP27zb+sQuq 6OIWEUSjPI+IY5hnesjSqg==; Received: from ch-vpn.virtuozzo.com ([130.117.225.6] helo=sky) by relay.virtuozzo.com with esmtps (TLS1.3) tls TLS_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1xKF8D-007iDn-0T; Fri, 23 Oct 2026 15:20:08 +0200 From: Alexander Ivanov To: andrey.zhadchenko@virtuozzo.com Date: Fri, 23 Oct 2026 15:20:05 +0200 Message-ID: <20261023132008.2304901-1-alexander.ivanov@virtuozzo.com> X-Mailer: git-send-email 2.53.0 MIME-Version: 1.0 X-OZ-Fwd: true Cc: devel@openvz.org Subject: [Devel] [PATCH hci-8.1 0/3] dm-qcow2: keep images of a read-only table unmodified X-BeenThere: devel@openvz.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: OpenVZ development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: devel-bounces@openvz.org Errors-To: devel-bounces@openvz.org A read-only dm-qcow2 table does not protect its images. Writes to the device pass through bio_check_ro() with a warning and allocate clusters in the top image, an O_RDWR top image is truncated on .ctr and .preresume, and merge_backward modifies the lower image. Since the header is not updated for a read-only table, persistent bitmaps stay marked consistent while the data under them changes. Patch 1 makes an image writable only if both its file and the table are writable. Patch 2 fails writes to a read-only table. Patch 3 keeps the bitmaps autoclear bit clear if it is already clear in the image, so that a later writable open does not revalidate stale bitmaps. https://virtuozzo.atlassian.net/browse/VSTOR-138887 Alexander Ivanov (3): drivers/md/dm-qcow2: treat images of a read-only table as read-only drivers/md/dm-qcow2: fail writes to a read-only table drivers/md/dm-qcow2: do not revalidate inconsistent persistent bitmaps drivers/md/dm-qcow2-map.c | 9 ++++++--- drivers/md/dm-qcow2-target.c | 11 +++++++---- drivers/md/dm-qcow2.h | 3 ++- 3 files changed, 15 insertions(+), 8 deletions(-) -- 2.53.0 _______________________________________________ Devel mailing list Devel@openvz.org https://lists.openvz.org/mailman/listinfo/devel