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Thu, 2 Jul 2020 13:32:40 +0000 (UTC) Subject: Re: [PATCH v9 24/34] qcow2: Add subcluster support to check_refcounts_l2() To: Alberto Garcia , qemu-devel@nongnu.org References: <8f424f702967348a6180cf4bc492d7ddede5ae57.1593342067.git.berto@igalia.com> From: Max Reitz Autocrypt: addr=mreitz@redhat.com; prefer-encrypt=mutual; keydata= mQENBFXOJlcBCADEyyhOTsoa/2ujoTRAJj4MKA21dkxxELVj3cuILpLTmtachWj7QW+TVG8U /PsMCFbpwsQR7oEy8eHHZwuGQsNpEtNC2G/L8Yka0BIBzv7dEgrPzIu+W3anZXQW4702+uES U29G8TP/NGfXRRHGlbBIH9KNUnOSUD2vRtpOLXkWsV5CN6vQFYgQfFvmp5ZpPeUe6xNplu8V mcTw8OSEDW/ZnxJc8TekCKZSpdzYoxfzjm7xGmZqB18VFwgJZlIibt1HE0EB4w5GsD7x5ekh awIe3RwoZgZDLQMdOitJ1tUc8aqaxvgA4tz6J6st8D8pS//m1gAoYJWGwwIVj1DjTYLtABEB AAG0HU1heCBSZWl0eiA8bXJlaXR6QHJlZGhhdC5jb20+iQFTBBMBCAA9AhsDBQkSzAMABQsJ CAcCBhUICQoLAgQWAgMBAh4BAheABQJVzie5FRhoa3A6Ly9rZXlzLmdudXBnLm5ldAAKCRD0 B9sAYdXPQDcIB/9uNkbYEex1rHKz3mr12uxYMwLOOFY9fstP5aoVJQ1nWQVB6m2cfKGdcRe1 2/nFaHSNAzT0NnKz2MjhZVmcrpyd2Gp2QyISCfb1FbT82GMtXFj1wiHmPb3CixYmWGQUUh+I AvUqsevLA+WihgBUyaJq/vuDVM1/K9Un+w+Tz5vpeMidlIsTYhcsMhn0L9wlCjoucljvbDy/ 8C9L2DUdgi3XTa0ORKeflUhdL4gucWoAMrKX2nmPjBMKLgU7WLBc8AtV+84b9OWFML6NEyo4 4cP7cM/07VlJK53pqNg5cHtnWwjHcbpGkQvx6RUx6F1My3y52vM24rNUA3+ligVEgPYBuQEN BFXOJlcBCADAmcVUNTWT6yLWQHvxZ0o47KCP8OcLqD+67T0RCe6d0LP8GsWtrJdeDIQk+T+F xO7DolQPS6iQ6Ak2/lJaPX8L0BkEAiMuLCKFU6Bn3lFOkrQeKp3u05wCSV1iKnhg0UPji9V2 W5eNfy8F4ZQHpeGUGy+liGXlxqkeRVhLyevUqfU0WgNqAJpfhHSGpBgihUupmyUg7lfUPeRM DzAN1pIqoFuxnN+BRHdAecpsLcbR8sQddXmDg9BpSKozO/JyBmaS1RlquI8HERQoe6EynJhd 64aICHDfj61rp+/0jTIcevxIIAzW70IadoS/y3DVIkuhncgDBvGbF3aBtjrJVP+5ABEBAAGJ ASUEGAEIAA8FAlXOJlcCGwwFCRLMAwAACgkQ9AfbAGHVz0CbFwf9F/PXxQR9i4N0iipISYjU sxVdjJOM2TMut+ZZcQ6NSMvhZ0ogQxJ+iEQ5OjnIputKvPVd5U7WRh+4lF1lB/NQGrGZQ1ic alkj6ocscQyFwfib+xIe9w8TG1CVGkII7+TbS5pXHRxZH1niaRpoi/hYtgzkuOPp35jJyqT/ /ELbqQTDAWcqtJhzxKLE/ugcOMK520dJDeb6x2xVES+S5LXby0D4juZlvUj+1fwZu+7Io5+B bkhSVPb/QdOVTpnz7zWNyNw+OONo1aBUKkhq2UIByYXgORPFnbfMY7QWHcjpBVw9MgC4tGeF R4bv+1nAMMxKmb5VvQCExr0eFhJUAHAhVg== Message-ID: Date: Thu, 2 Jul 2020 15:32:38 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.9.0 MIME-Version: 1.0 In-Reply-To: <8f424f702967348a6180cf4bc492d7ddede5ae57.1593342067.git.berto@igalia.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mreitz@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="eqludxudOYTn668IDsor8LqDGPHaAPF7p" Received-SPF: pass client-ip=205.139.110.61; envelope-from=mreitz@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/02 03:42:59 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Derek Su , Vladimir Sementsov-Ogievskiy , qemu-block@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --eqludxudOYTn668IDsor8LqDGPHaAPF7p Content-Type: multipart/mixed; boundary="uDnTCDiqiWYjyZiRZYtL4My89slysICxF" --uDnTCDiqiWYjyZiRZYtL4My89slysICxF Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 28.06.20 13:02, Alberto Garcia wrote: > The offset field of an uncompressed cluster's L2 entry must be aligned > to the cluster size, otherwise it is invalid. If the cluster has no > data then it means that the offset points to a preallocation, so we > can clear the offset field without affecting the guest-visible data. > This is what 'qemu-img check' does when run in repair mode. >=20 > On traditional qcow2 images this can only happen when QCOW_OFLAG_ZERO > is set, and repairing such entries turns the clusters from ZERO_ALLOC > into ZERO_PLAIN. >=20 > Extended L2 entries have no ZERO_ALLOC clusters and no QCOW_OFLAG_ZERO > but the idea is the same: if none of the subclusters are allocated > then we can clear the offset field and leave the bitmap untouched. >=20 > Signed-off-by: Alberto Garcia > --- > block/qcow2-refcount.c | 16 +++++++++++----- > tests/qemu-iotests/060.out | 2 +- > 2 files changed, 12 insertions(+), 6 deletions(-) Reviewed-by: Max Reitz --uDnTCDiqiWYjyZiRZYtL4My89slysICxF-- --eqludxudOYTn668IDsor8LqDGPHaAPF7p Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEkb62CjDbPohX0Rgp9AfbAGHVz0AFAl794fYACgkQ9AfbAGHV z0BOpggAnSVkfWh1pgHMupV6a3+f+UHMg28EDAQCZpZDxbLKP5SkWHB9T9DLekpZ Uza8vvpv/qAOl/b++tNVHJAmyM8bij7YyDVuY/N8TnZ6CoMULtDxJ9yvNJLX89vt g/eV1rTLhUx7MxcjYVSKd1CQOGHmkAW/trEm+D3b1OWzZRqeV8e3YBZX/J/m0KlQ vG+rWkUr3jeC+HAgCaPXX6X09H68gCDfNXoYXpl4X3qrWm3URlFJSqcOg53VPlpz FzOQb79No6kWtA+2YhmtxyTIcfL44O1Ybbdrqo74mOxsFfx+2WwjV9IF+MFcROQf wCA3l8h0Lh95FO5kHflG+4KZPoZ3WQ== =hTvD -----END PGP SIGNATURE----- --eqludxudOYTn668IDsor8LqDGPHaAPF7p--