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[130.117.225.111]) by mx.google.com with ESMTPS id 5b1f17b1804b1-4b90ee128a1si94009235e9.11.2026.11.09.07.40.39 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=FWvq5WuJ; 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=Vx8qqFNk+ZyInqlSwCym7AQmUcBTGH46/TtRHUtbd3Y=; b=FWvq5WuJ3I9y qTTdtRx4MJ4ANt4jT4ArKvfx3iNImKhHrJZDRwUgh7GeohIZFk7oHXi20EZ6ooLD6362dkLRTa2nm hcpFfwsWVxfNSPKnpzMmd2J91+b2bWGTzMDcU+6V0ZaXD4in6kuhNUN42QOJ9eoxgRBhhoKC5BIZ6 e+hrKoj5h68iSWqWrvTl7/81LYNG2XM94w2OhMwCfvgdychBilnmSf96X3s7V4N9LAOeULXCjaLaM UjWXyMr2Td4T6P5oLVO+KxoEqKYueBsinbvoVT2dlM45fRCCsg6vusgcNfskzVnzjqG8zqwU514lj JhI4FrROi+Ivtc1fpHOlWg==; 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-2O; Mon, 09 Nov 2026 16:40:30 +0100 From: Andrey Zhadchenko To: khorenko@virtuozzo.com, alexander.ivanov@virtuozzo.com Date: Mon, 9 Nov 2026 18:36:18 +0300 Message-ID: <20261109153619.277888-2-andrey.zhadchenko@virtuozzo.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20261109153619.277888-1-andrey.zhadchenko@virtuozzo.com> References: <20261109153619.277888-1-andrey.zhadchenko@virtuozzo.com> MIME-Version: 1.0 X-OZ-Fwd: true Cc: devel@openvz.org Subject: [Devel] [PATCH hci-8.1 1/2] dm-qcow2: set max discard segments to one 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 Discard is a special type of request that can have non-contiguous bios. Imagine we have a request with starting sector 0 and length 1024, so read or write means [0, 1024) range in the file. For discard this request can have 2 bios [0, 512) and [1024, 1536), but we always discarded [0, 1024). Set max_discard_segments to 1 to avoid such merges. https://virtuozzo.atlassian.net/browse/VSTOR-154159 Fixes: 222b6f1291c1 ("dm-qcow2: Introduce driver to create block devices over QCOW2 files") Feature: dm-qcow2: block device over QCOW2 files driver Signed-off-by: Andrey Zhadchenko --- drivers/md/dm-qcow2-target.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/md/dm-qcow2-target.c b/drivers/md/dm-qcow2-target.c index 7c572bd66e1ca..8337efc5c6238 100644 --- a/drivers/md/dm-qcow2-target.c +++ b/drivers/md/dm-qcow2-target.c @@ -1053,6 +1053,7 @@ static void qcow2_io_hints(struct dm_target *ti, struct queue_limits *limits) */ limits->discard_granularity = sb->s_blocksize; limits->max_hw_discard_sectors = to_sector(qcow2->clu_size); + limits->max_discard_segments = 1; limits->logical_block_size = block_size; limits->physical_block_size = block_size; -- 2.43.5 _______________________________________________ Devel mailing list Devel@openvz.org https://lists.openvz.org/mailman/listinfo/devel