From: Alexander Ivanov <alexander.ivanov@virtuozzo.com>
To: Konstantin Khorenko <khorenko@virtuozzo.com>
Cc: devel@openvz.org
Subject: Re: [Devel] [PATCH hci-8.1 v5 3/3] dm-qcow2: truncate unused tail of image on suspend
Date: Thu, 22 Oct 2026 10:35:03 +0200 [thread overview]
Message-ID: <7a7bd403-8aa3-4203-8ba5-7564740e426b@virtuozzo.com> (raw)
In-Reply-To: <179259732233.3864599.9993825844420241421.b4-review@b4>
> The scan trusts the refcounts and never checks them against L1/L2. A
> wrong refcount or a wrong scan start then costs data on the first
> suspend: stop, snapshot or compact.
By checking the refcounts, we only process the unused tail. If we were
to check the L1/L2 tables, we would have to process the entire image
from beginning to end.
I'll fix other issues.
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next prev parent reply other threads:[~2026-10-22 8:36 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-10 12:46 [Devel] [PATCH hci-8.1 v5 0/3] " Alexander Ivanov
2026-10-10 12:46 ` [Devel] [PATCH hci-8.1 v5 1/3] dm-qcow2: add qcow2_md_page_read_sync() helper Alexander Ivanov
2026-10-10 12:51 ` no-reply
2026-10-21 15:42 ` Konstantin Khorenko
2026-10-10 12:46 ` [Devel] [PATCH hci-8.1 v5 2/3] dm-qcow2: drop duplicate prefix from QC_ERR/QC_INFO messages Alexander Ivanov
2026-10-10 12:50 ` no-reply
2026-10-21 15:42 ` Konstantin Khorenko
2026-10-10 12:46 ` [Devel] [PATCH hci-8.1 v5 3/3] dm-qcow2: truncate unused tail of image on suspend Alexander Ivanov
2026-10-10 12:53 ` no-reply
2026-10-12 9:35 ` Andrey Zhadchenko
2026-10-21 15:42 ` Konstantin Khorenko
2026-10-21 17:53 ` Denis V. Lunev
2026-10-22 8:35 ` Alexander Ivanov [this message]
2026-10-12 9:59 ` [Devel] [PATCH hci-8.1 v5 0/3] " Andrey Zhadchenko
2026-10-21 15:42 ` Konstantin Khorenko
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