Re: [Qemu-devel] [Qemu-block] [PATCH v3 1/2] blockdev: Error out on negative throttling option values

[Max Reitz]

On 14.01.2016 16:46, Max Reitz wrote:
> On 14.01.2016 05:08, Fam Zheng wrote:
>> The implicit casting from unsigned int to double changes negative values
>> into large positive numbers and accepts them.  We should instead print
>> an error.
>>
>> Check the number range so this case is caught and reported.
>>
>> Signed-off-by: Fam Zheng <f...@redhat.com>
>> ---
>>  blockdev.c              |  3 ++-
>>  include/qemu/throttle.h |  2 ++
>>  util/throttle.c         | 16 ++++++----------
>>  3 files changed, 10 insertions(+), 11 deletions(-)
> 
> Reviewed-by: Max Reitz <mre...@redhat.com>
> 
>> diff --git a/blockdev.c b/blockdev.c
>> index 2df0c6d..1afef87 100644
>> --- a/blockdev.c
>> +++ b/blockdev.c
>> @@ -348,7 +348,8 @@ static bool check_throttle_config(ThrottleConfig *cfg, 
>> Error **errp)
>>      }
>>  
>>      if (!throttle_is_valid(cfg)) {
>> -        error_setg(errp, "bps/iops/maxs values must be 0 or greater");
>> +        error_setg(errp, "bps/iops/maxs values must be within [0, %" PRId64

Pre-existing, but you might want to fix this to "bps/iops/max" while
touching this line.

Max

>> +                         ")", (int64_t)THROTTLE_VALUE_MAX);
> 
> I personally would have liked a simpler %lli and no cast, but I can see
> why you want an explicit int64_t here.
> 
>>          return false;
>>      }
>>  
>> diff --git a/include/qemu/throttle.h b/include/qemu/throttle.h
>> index 12faaad..d0c98ed 100644
>> --- a/include/qemu/throttle.h
>> +++ b/include/qemu/throttle.h
>> @@ -29,6 +29,8 @@
>>  #include "qemu-common.h"
>>  #include "qemu/timer.h"
>>  
>> +#define THROTTLE_VALUE_MAX 1000000000000000LL
> 
> <pedantic>
> But then you could use UINT64_C(1000000000000000) here.
> </pedantic>
> 

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