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Mon, 4 Nov 2019 15:07:38 +0000 (UTC) Received: from dresden.str.redhat.com (unknown [10.36.118.44]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 569D15D9CD; Mon, 4 Nov 2019 15:07:37 +0000 (UTC) Subject: Re: [RFC PATCH v2 16/26] qcow2: Add subcluster support to discard_in_l2_slice() To: Alberto Garcia , qemu-devel@nongnu.org References: <8a87fb9b6e73f06dfc1a8aa9f3c0b4c01f2c9fbd.1572125022.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: <814afb3a-c534-f7f9-2366-65c77756cce6@redhat.com> Date: Mon, 4 Nov 2019 16:07:35 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 MIME-Version: 1.0 In-Reply-To: <8a87fb9b6e73f06dfc1a8aa9f3c0b4c01f2c9fbd.1572125022.git.berto@igalia.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Mimecast-Spam-Score: 0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="zeSU6XMohH9L6hv2iWvxp06Fphqgzi7pT" X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 205.139.110.120 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 , Anton Nefedov , qemu-block@nongnu.org, Vladimir Sementsov-Ogievskiy , "Denis V . Lunev" 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) --zeSU6XMohH9L6hv2iWvxp06Fphqgzi7pT Content-Type: multipart/mixed; boundary="QB0HUb6adYNVi0LcR6FoJNMmDzy4gN4FL" --QB0HUb6adYNVi0LcR6FoJNMmDzy4gN4FL Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 26.10.19 23:25, Alberto Garcia wrote: > Setting the QCOW_OFLAG_ZERO bit of the L2 entry is forbidden if an > image has subclusters. Instead, the individual 'all zeroes' bits must > be used. >=20 > Signed-off-by: Alberto Garcia > --- > block/qcow2-cluster.c | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) >=20 > diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c > index 3e4ba8d448..aa3eb727a5 100644 > --- a/block/qcow2-cluster.c > +++ b/block/qcow2-cluster.c > @@ -1772,7 +1772,11 @@ static int discard_in_l2_slice(BlockDriverState *b= s, uint64_t offset, > =20 > /* First remove L2 entries */ > qcow2_cache_entry_mark_dirty(s->l2_table_cache, l2_slice); > - if (!full_discard && s->qcow_version >=3D 3) { > + if (has_subclusters(s)) { > + set_l2_entry(s, l2_slice, l2_index + i, 0); > + set_l2_bitmap(s, l2_slice, l2_index + i, > + full_discard ? 0 : QCOW_L2_BITMAP_ALL_ZEROES); But only for !full_discard, right? Max > + } else if (!full_discard && s->qcow_version >=3D 3) { > set_l2_entry(s, l2_slice, l2_index + i, QCOW_OFLAG_ZERO); > } else { > set_l2_entry(s, l2_slice, l2_index + i, 0); >=20 --QB0HUb6adYNVi0LcR6FoJNMmDzy4gN4FL-- --zeSU6XMohH9L6hv2iWvxp06Fphqgzi7pT Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEkb62CjDbPohX0Rgp9AfbAGHVz0AFAl3APrcACgkQ9AfbAGHV z0C60wf9FPCsTDH/hpIKGbPRFy4umwg9lvo4iUNldRK/RDxfi9TnecQVheGF1PQx 3wAuCVxVrk3BsWyfhseQWE+0ztABIOHciIObgcbmE/ll8b0JYiv0bdJ2LHGjBHWb uBRA0TX/+Kbjv0oZr06ifJG91n3T4f1Q0LfdP+/v4Z1Xsju3JuKH26lUZyp88mmQ 47bJhA/D0DDT4JMyJ38Lg8jLal5p6+GtmFHzj7XVWaTNf/rTGI70qJVaxn300xOE hOfW/64WXRv6OADUZnYs0gBaB5H5azv6Fb/a3jNGB++RjO/V6KyRADti6XoYvOI8 PEEVzy33LxcNkmNjWx4A3Ms2ftBNsw== =ANM8 -----END PGP SIGNATURE----- --zeSU6XMohH9L6hv2iWvxp06Fphqgzi7pT--