Re: [Qemu-devel] Failing QEMU iotest 175

[Thomas Huth]

On 02/05/2019 23.56, Eric Blake wrote:
> On 4/28/19 10:18 AM, Thomas Huth wrote:
>> QEMU iotest 175 is failing for me when I run it with -raw:
>>
> 
>>  == creating image with default preallocation ==
>>  Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576
>> -size=1048576, blocks=0
>> +size=1048576, blocks=2
> 
> What filesystem?

ext4

> It should be fairly obvious that 'stat -c blocks=%b' is
> file-system dependent (some allocate slightly more or less space, based
> on granularities and on predictions of future use), so we may need to
> update the test to apply a filter or otherwise allow a bit of fuzz in
> the answer. But 0/2 is definitely different than...
>>
>>  == creating image with preallocation off ==
>>  Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576 preallocation=off
>> -size=1048576, blocks=0
>> +size=1048576, blocks=2
>>
>>  == creating image with preallocation full ==
>>  Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1048576 preallocation=full
>> -size=1048576, blocks=2048
>> +size=1048576, blocks=2050
> 
> 2048/2050, so we DO have some indication of whether the file is sparse
> or fully allocated.

Maybe we could check that the value after "blocks=" is a single digit in
the first case, and matches "blocks=20.." in the second case?

 Thomas

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