Re: [Qemu-devel] [PATCH v2 6/7] qemu-iotests: add initial tests for live block commit

[Eric Blake]

On 09/25/2012 10:29 AM, Jeff Cody wrote:
> Derived from the streaming test cases (030), this adds the
> following tests:
> 
> 1. For the following image chain, commit [mid] into [backing],
>    and use qemu-io to verify [backing] has its original data, as
>    well as the data from [mid]
> 
>            [backing] <-- [mid] <-- [test]
> 
> 2. Verifies that 'block-commit' with the 'speed' parameter sets the
>    speed parameter, as reported by 'query-block-jobs'
> 
> 3. Verifies that a bogus 'device' parameter to 'block-commit'
>    results in error

I think you are missing a test; you should also verify that:

{ "command":"block-commit", "arguments":{
  "device":"drive0", "base":"mid", "top":"backing" } }

properly fails, since 'mid' is not a backing file of 'backing'.  I saw
code in patch 1/7 that bdrv_drop_intermediate() should detect the
situation, but I'm not confident enough in my reading of patch 2/7 to
know if that detection point was early enough, or whether the coroutine
stuff in 2/7 ends up corrupting 'mid' prior to failure.

-- 
Eric Blake   address@hidden    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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