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Re: [Xen-devel] [PATCH] ioemu block device extent checks

To: Kevin Wolf <kwolf@xxxxxxx>, "Daniel P. Berrange" <berrange@xxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH] ioemu block device extent checks
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Tue, 04 Mar 2008 10:08:55 +0000
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
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On 4/3/08 10:16, "Kevin Wolf" <kwolf@xxxxxxx> wrote:

> Daniel P. Berrange schrieb:
>> FYI, this patch causes massive unrecoverable data loss / corruption on
>> QCow2 files. The checks themselves are OK in terms of the first level
>> of bdrv_* calls from the guest. The qcow driver though calls back into
>> the raw driver for performing I/O on its underlying file. The qcow
>> driver relies on this file being grow-on-demand for purposes of allocating
>> new qcow sectors. The safety checks cause this allocation to fail and
>> it all goes downhill from there :-(
> 
> I just hit this problem. What's the status?  If I understand correctly,
> you discussed two different solutions and as a result no fix at all got
> committed.

Current xen-unstable tip should have it fixed (by a combination of
changesets 17133 and 17177).

 -- Keir



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