From: Kevin Wolf <kwolf@redhat.com>
To: Eric Blake <eblake@redhat.com>
Cc: Olaf Hering <olaf@aepfle.de>,
qemu-block@nongnu.org,
Stefano Stabellini <sstabellini@kernel.org>,
"open list:All patches CC here" <qemu-devel@nongnu.org>,
Max Reitz <mreitz@redhat.com>,
"open list:X86" <xen-devel@lists.xensource.com>,
Anthony Perard <anthony.perard@citrix.com>
Subject: Re: [Qemu-devel] [PATCH for-2.8 v3] xen_disk: split discard input to match internal representation
Date: Wed, 23 Nov 2016 13:27:13 +0100 [thread overview]
Message-ID: <20161123122713.GA5068@noname.redhat.com> (raw)
In-Reply-To: <96433c69-0e6d-7cd9-3adb-6349d7dff1b3@redhat.com>
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Am 23.11.2016 um 12:40 hat Eric Blake geschrieben:
> On 11/23/2016 04:39 AM, Olaf Hering wrote:
> > The guest sends discard requests as u64 sector/count pairs, but the
> > block layer operates internally with s64/s32 pairs. The conversion
> > leads to IO errors in the guest, the discard request is not processed.
> >
> > domU.cfg:
> > 'vdev=xvda, format=qcow2, backendtype=qdisk, target=/x.qcow2'
> > domU:
> > mkfs.ext4 -F /dev/xvda
> > Discarding device blocks: failed - Input/output error
> >
> > Fix this by splitting the request into chunks of BDRV_REQUEST_MAX_SECTORS.
> > Add input range checking to avoid overflow.
> >
> > Fixes f313520 ("xen_disk: add discard support")
> >
> > Signed-off-by: Olaf Hering <olaf@aepfle.de>
> > ---
>
> Qualifies as a bug fix, so requesting 2.8 inclusion.
> Reviewed-by: Eric Blake <eblake@redhat.com>
Stefano, are you going to merge this or should I take a look?
Kevin
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next prev parent reply other threads:[~2016-11-23 12:27 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-23 10:39 [Qemu-devel] [PATCH v3] xen_disk: split discard input to match internal representation Olaf Hering
2016-11-23 11:40 ` [Qemu-devel] [PATCH for-2.8 " Eric Blake
2016-11-23 12:27 ` Kevin Wolf [this message]
2016-11-23 18:46 ` Stefano Stabellini
2016-11-23 20:44 ` Olaf Hering
2016-11-23 22:13 ` Olaf Hering
2016-11-23 15:50 ` [Qemu-devel] [PATCH " Anthony PERARD
2016-11-23 18:46 ` Stefano Stabellini
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