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Mon, 12 Aug 2019 15:56:13 +0000 (UTC) To: Vladimir Sementsov-Ogievskiy , "qemu-block@nongnu.org" References: <20190725155512.9827-1-mreitz@redhat.com> <20190725155512.9827-4-mreitz@redhat.com> <627fbb64-5ffe-aca7-6198-9d991d4219e3@virtuozzo.com> From: Max Reitz Openpgp: preference=signencrypt 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: Mon, 12 Aug 2019 17:56:12 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <627fbb64-5ffe-aca7-6198-9d991d4219e3@virtuozzo.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="DUEMRufGGhqwUA6Ilm9dlcITOAeqveMy6" X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.44]); Mon, 12 Aug 2019 15:56:15 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: Re: [Qemu-devel] [PATCH 3/3] vpc: Do not return RAW from block_status 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 , "qemu-devel@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) --DUEMRufGGhqwUA6Ilm9dlcITOAeqveMy6 Content-Type: multipart/mixed; boundary="KKjasorYGtp63cw708yEaQmGHQoGEl6HU"; protected-headers="v1" From: Max Reitz To: Vladimir Sementsov-Ogievskiy , "qemu-block@nongnu.org" Cc: "qemu-devel@nongnu.org" , Kevin Wolf Message-ID: Subject: Re: [PATCH 3/3] vpc: Do not return RAW from block_status References: <20190725155512.9827-1-mreitz@redhat.com> <20190725155512.9827-4-mreitz@redhat.com> <627fbb64-5ffe-aca7-6198-9d991d4219e3@virtuozzo.com> In-Reply-To: <627fbb64-5ffe-aca7-6198-9d991d4219e3@virtuozzo.com> --KKjasorYGtp63cw708yEaQmGHQoGEl6HU Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 12.08.19 17:33, Vladimir Sementsov-Ogievskiy wrote: > 25.07.2019 18:55, Max Reitz wrote: >> vpc is not really a passthrough driver, even when using the fixed >> subformat (where host and guest offsets are equal). It should handle >> preallocation like all other drivers do, namely by returning >> DATA | RECURSE instead of RAW. >> >> There is no tangible difference but the fact that bdrv_is_allocated() = no >> longer falls through to the protocol layer. >=20 > Hmm. Isn't a real bug (fixed by this patch) ? >=20 > Assume vpc->file is qcow2 with backing, which have "unallocated" region= , which is > backed by actual data in backing file. Come on now. > So, this region will be reported as not allocated and will be skipped b= y any copying > loop using block-status? Is it a bug of BDRV_BLOCK_RAW itself? Or I don= 't understand > something.. I think what you don=E2=80=99t understand is that if you have a vpc file = inside of a qcow2 file, you=E2=80=99re doing basically everything wrong. ;-) But maybe we should drop BDRV_BLOCK_RAW... Does it do anything good for us in the raw driver? Shouldn=E2=80=99t it too just return DATA | RECURS= E? Max --KKjasorYGtp63cw708yEaQmGHQoGEl6HU-- --DUEMRufGGhqwUA6Ilm9dlcITOAeqveMy6 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEkb62CjDbPohX0Rgp9AfbAGHVz0AFAl1RjBwACgkQ9AfbAGHV z0DTmgf/QGGou/O6KI4e6Gmi9DjMZOUBecwMam4DgXSM1h1BFG4hKi8YNBc/TiXY Ph8fghqowwOg3LQ2Ono7D4ceYqVdW2KdtWvAN6D2lBNB5L6tCr+cM4fxYkMsXji6 rtatPx8mh7EQv+mUf8QDXpFMh+EqXx3AFjk5Em08QilIfcHPpy99lskKfXhYOvoh KAy3RDgV0PDtdOpj44HCSjyz2BcLm4InK/9pFujnhpugb7CFRQ1Y5KI9Uc16ade1 1Zrf6BoI8rE91nbMVwTnzD1kb1JNLqktxoNow6FlFv+Sj8kRa5ny4ZYb9e9TJY5S vVFmzlmD4hhKCwmDMw2QMaijOAVs5A== =PmGX -----END PGP SIGNATURE----- --DUEMRufGGhqwUA6Ilm9dlcITOAeqveMy6--