Re: [PATCH 3/3] qemu: Clarify usage of DomainObjIsActive for SetTime

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On 04/19/2016 10:30 AM, Ján Tomko wrote:
> On Fri, Apr 15, 2016 at 10:00:14AM -0400, Cole Robinson wrote:
>> This converts SetTime to the common obj->agent->isactive pattern
>> (which adds a _third_ IsActive check), and documents the extra
>> checks
> 
> I would not expect a commit with the summary 'Clarify usage' to change
> job handling.
> 
> 
>> ---
>>  src/qemu/qemu_driver.c | 16 +++++++++++++---
>>  1 file changed, 13 insertions(+), 3 deletions(-)
>>
>> diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
>> index f8dfa27..43f22f1 100644
>> --- a/src/qemu/qemu_driver.c
>> +++ b/src/qemu/qemu_driver.c
>> @@ -18725,9 +18725,9 @@ qemuDomainSetTime(virDomainPtr dom,
>>  
>>      priv = vm->privateData;
>>  
>> -    if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0)
>> -        goto cleanup;
>> -
> 
> This will let us report the capability error without even getting the
> job.
> 
>> +    /* We also perform this check further down after grabbing the
>> +       job lock, but do it here too so we can throw an error for
>> +       an invalid config, before trying to talk to the guest agent */
> 
> s/trying to talk to the guest agent/acquiring the job/
> 
>>      if (!virDomainObjIsActive(vm)) {
>>          virReportError(VIR_ERR_OPERATION_INVALID,
>>                         "%s", _("domain is not running"));
>> @@ -18746,9 +18746,18 @@ qemuDomainSetTime(virDomainPtr dom,
>>          goto endjob;
> 
> This goto would end the job before it was even started.
> 
>>      }
>>  
>> +    if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0)
>> +        goto cleanup;
>> +
>>      if (!qemuDomainAgentAvailable(vm, true))
>>          goto endjob;
>>  
>> +    if (!virDomainObjIsActive(vm)) {
>> +        virReportError(VIR_ERR_OPERATION_INVALID,
>> +                       "%s", _("domain is not running"));
>> +        goto endjob;
>> +    }
>> +
>>      qemuDomainObjEnterAgent(vm);
>>      rv = qemuAgentSetTime(priv->agent, seconds, nseconds, rtcSync);
>>      qemuDomainObjExitAgent(vm);
>> @@ -18756,6 +18765,7 @@ qemuDomainSetTime(virDomainPtr dom,
>>      if (rv < 0)
>>          goto endjob;
>>  
>> +    /* The VM may have shut down inbetween, check state again */
> 
> This pattern is so common that commenting it is pointless.
> Maybe the IsActive check could be moved inside qemuDomainObjExitAgent
> as I've done for qemuDomainObjExitMonitor.
> 

Thanks for your comments, I'll look into that

- Cole

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