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From: Junpeng.Li <ctlaltlaltc@gmail.com>
References: <m2efj9q2i2.fsf@gmail.com>
	<d540f8da-3f0a-71a9-0050-8e8f95153f1c@redhat.com>
Date: Sat, 21 Apr 2018 12:46:53 +0800
In-Reply-To: <d540f8da-3f0a-71a9-0050-8e8f95153f1c@redhat.com> (Eric Blake's
	message of "Fri, 20 Apr 2018 14:06:31 -0500")
Message-ID: <87lgdhrwsi.fsf@workstation.novalocal>
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Subject: Re: [Qemu-devel] qemu-io read do not dump buffer when in quiet mode
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To: Eric Blake <eblake@redhat.com>
Cc: qemu-devel@nongnu.org

Eric Blake <eblake@redhat.com> writes:

> On 04/20/2018 11:14 AM, Junpeng.Li wrote:
>> 
>> Hi, everyone. I found a question or maybe a bug during use qemu-io to read
>> a range file and take the params -vq to dump buffer and do not show
>> I/O statistics. I use the params -vq what i want is just dump buffer
>> but do not show I/O statistics, but as the result show it is not.
>> 
>> Like below command, it do not dump buffer to standard output.
>> 
>> qemu-io -r -c "read -vq 0 1024" /tmp/test.qcow2
>> 
>> I saw the source code, when has qflag value it just goto out and do
>> not dump buffer when qflag and vflag has value at the same time.
>> 
>>     if (qflag) {
>>         goto out;
>>     }
>> 
>>     if (vflag) {
>>         dump_buffer(buf, offset, qiov.size);
>>     }
>> 
>> quiet mode here, it mean do not show I/O statistics or mean complete quiet?
>
> You're welcome to provide a patch to make it have saner behavior.  As
> long as running qemu-iotests doesn't break, we are pretty much free to
> refactor qemu-io as it is more a tool for internal testing than for
> external use.
Sorry for my question description and thanks your explanation.

--
BestRegard,
JPL