[PATCH v2 1/3] xfstests/btrfs: add qgroup rescan stress test

[Wang Shilong]

On 03/11/2014 03:43 AM, Josef Bacik wrote:
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> On 03/09/2014 11:44 PM, Wang Shilong wrote:
>> Test flow is to run fsstress after triggering quota rescan. the
>> ruler is simple, we just remove all files and directories, sync
>> filesystem and see if qgroup's ref and excl are nodesize.
>>
>> Signed-off-by: Wang Shilong <wangsl.fnst at cn.fujitsu.com> ---
>> v1->v2: switch into new helper _run_btrfs_util_prog() ---
>> tests/btrfs/041     | 76
>> +++++++++++++++++++++++++++++++++++++++++++++++++++++
>> tests/btrfs/041.out |  3 +++ tests/btrfs/group   |  1 + 3 files
>> changed, 80 insertions(+) create mode 100644 tests/btrfs/041 create
>> mode 100644 tests/btrfs/041.out
>>
> So this doesn't pass for me but it's not because we're broken, it's
> because the test is broken.  What you should do is run sync after you
> do the rm, and then capture the output of btrfs qgroup show, and then
> do the rescan and redo qgroup show and make sure the numbers match.  I
> did this in my qgroup test, you can look there as an example.  Thanks,
Let's take a look at my test flows:

step1: write some random data to fs tree and then create a snapshot of 
fs tree.

step2: also try to write some random data to newly created snapshot.

step3: enable quota and wait quota rescan finished.(btrfs quota rescan -w)

step4: remove all files and sync btrfs filesystem.

So i did a simple test that if we don't create snapshot here, i get 
qgroup accounting
right here, so i think it is realted to qgroup accounting that differs 
'refer' and 'excl'.

Thanks,
Wang
>
> Josef
>
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