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Fri, 25 Oct 2019 14:16:25 +0000 (UTC) Subject: Re: [RFC 0/3] block/file-posix: Work around XFS bug To: Peter Maydell References: <20191025095849.25283-1-mreitz@redhat.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: <19d50c64-c07a-3122-dea3-a5d97a2d35da@redhat.com> Date: Fri, 25 Oct 2019 16:16:23 +0200 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: X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Mimecast-Spam-Score: 0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="A9MqMLkCNwZ2tVYlaSTkYYgNzZkfUqRjm" X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 207.211.31.81 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 , Vladimir Sementsov-Ogievskiy , Alberto Garcia , Qemu-block , QEMU Developers , Anton Nefedov , Stefan Hajnoczi 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) --A9MqMLkCNwZ2tVYlaSTkYYgNzZkfUqRjm Content-Type: multipart/mixed; boundary="uunxsj7TC4jBsZez9zW9HTVGMOKuXI8mR" --uunxsj7TC4jBsZez9zW9HTVGMOKuXI8mR Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 25.10.19 15:46, Peter Maydell wrote: > On Fri, 25 Oct 2019 at 11:09, Max Reitz wrote: >> >> Hi, >> >> It seems to me that there is a bug in Linux=E2=80=99s XFS kernel driver,= as >> I=E2=80=99ve explained here: >> >> https://lists.nongnu.org/archive/html/qemu-block/2019-10/msg01429.html >> >> In combination with our commit c8bb23cbdbe32f, this may lead to guest >> data corruption when using qcow2 images on XFS with aio=3Dnative. >=20 > Have we reported that upstream to the xfs folks? I=E2=80=99ve created an RH BZ here: https://bugzilla.redhat.com/show_bug.cgi?id=3D1765547 So at least some XFS folks are aware of it (and I trust them to inform the others as necessary :-)). (Eric Sandeen has been part of the discussion for the last couple of days already.) Max --uunxsj7TC4jBsZez9zW9HTVGMOKuXI8mR-- --A9MqMLkCNwZ2tVYlaSTkYYgNzZkfUqRjm Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEkb62CjDbPohX0Rgp9AfbAGHVz0AFAl2zA7cACgkQ9AfbAGHV z0C2Dwf8DiH4VkH2KV7SXkurXAJ8OFM/GXFRqiHfyGCPqXNcwRZ7gygcExVXme3f XFuXi6zHXOVdju3sEITytIbQX8b4KGq2fjB43+MOb0M5qTVFhgQwW3Si+0YZeQlJ w9uQjK/n3inS0FYrHG1adyJ8Adt19R7reebJtPxkveG9IpASheSwAoRoK+KhpjpW /Sx7fxyxdmXrVtjNF9acjUKzp/xz3jRuiizqldi5a63gXTSPOjhnQQgmYOGjqkg+ 0Yg8+kL73BzB7aHklEyVqgKOIk7T+y8zIiUs95tIgQz75GrCZSlXu8MNUtnCTiK/ 4JvaI27AODBvRMkmiIks5JEyxIBanA== =oHJV -----END PGP SIGNATURE----- --A9MqMLkCNwZ2tVYlaSTkYYgNzZkfUqRjm--