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

[Jeff Cody <jcody@redhat.com>]

On 09/25/2012 02:02 PM, Eric Blake wrote:
> 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.
> 

Good idea.  This seems like a good test to have in place.