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[130.117.225.111]) by mx.google.com with ESMTPS id ffacd0b85a97d-49596cb8f43si8883353f8f.120.2026.11.09.07.40.39 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Nov 2026 07:40:39 -0800 (PST) Received-SPF: pass (google.com: domain of andrey.zhadchenko@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=C3Ms9vfz; spf=pass (google.com: domain of andrey.zhadchenko@virtuozzo.com designates 130.117.225.111 as permitted sender) smtp.mailfrom=andrey.zhadchenko@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=VMDivBBCKHtb5VwNkMh3NCC2/kmazPHJooi1ixmH/cI=; b=C3Ms9vfzWHDC vudUxQzFjw6nSyoMb7GKZ5e89fLw0SUS0xpdQaEFHwlY/u7NPAQp/xgeSFCRfURTQ4MBwBTF8AK1Y tIEDX6ayw1guKwLLgcdL21qk15d/nVtXumn7n8FrovGza7/Yd5u7nUwLwWlKbh7u4qyxcntC6SFxI ekNf4BCpxjuJuxx2FOZR+k+fel6rk+8ZGR0khnLagOAroNtkS0L123oBiNfxjaXsLSvpdyCG0M+Pm xBDcQVhwpryTs5HmXcYABQhbgVuo1QJ4rjhN0CPkvTxP/qnSsgRaWwIUdjP0HPy31kN/Zn7Y6NfFp KvaGop+o9tJ8ctF70/G5+Q==; Received: from [130.117.225.5] (helo=vz9-demens-1.aci.vzint.dev) by relay.virtuozzo.com with esmtp (Exim 4.96) (envelope-from ) id 1xQRQ2-007nxS-2D; Mon, 09 Nov 2026 16:40:30 +0100 From: Andrey Zhadchenko To: khorenko@virtuozzo.com, alexander.ivanov@virtuozzo.com Date: Mon, 9 Nov 2026 18:36:17 +0300 Message-ID: <20261109153619.277888-1-andrey.zhadchenko@virtuozzo.com> X-Mailer: git-send-email 2.43.5 MIME-Version: 1.0 X-OZ-Fwd: true Cc: devel@openvz.org Subject: [Devel] [PATCH hci-8.1 0/2] dm-qcow2, dm-ploop: do not merge discards with gaps 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 The block layer may merge non-contiguous discard bios into a single request when the queue allows more than one discard segment, and the stacking default for dm is max_discard_segments = USHRT_MAX. Both dm-qcow2 and dm-ploop handle a discard request as one contiguous range taken from blk_rq_pos() and blk_rq_bytes(). For a request built from bios [0, 512) and [1024, 1536) they discard [0, 1024), which hits sectors that were never asked to be discarded and misses part of the range that was. Set max_discard_segments to 1 in both targets so each discard request always describes a single contiguous range. https://virtuozzo.atlassian.net/browse/VSTOR-154159 Andrey Zhadchenko (2): dm-qcow2: set max discard segments to one dm-ploop: set max discard segments to one drivers/md/dm-ploop-target.c | 1 + drivers/md/dm-qcow2-target.c | 1 + 2 files changed, 2 insertions(+) -- 2.43.5 _______________________________________________ Devel mailing list Devel@openvz.org https://lists.openvz.org/mailman/listinfo/devel