Re: [PATCH v3] btrfs: Test proper interaction between skip_balance and paused balance

[Eryu Guan <eguan@linux.alibaba.com>]

On Wed, Nov 10, 2021 at 12:07:37PM +0200, Nikolay Borisov wrote:
> <snip>
> 
> 
> >> +# titled "btrfs: allow device add if balance is paused"
> > 
> > It is a new feature, not a bug fix? The kernel patch won't backport to
> > the stable kernels. Then on older kernels, this test has to exit with
> > _notrun().
> > Is there any way to achieve this? There isn't any sysfs interface that
> > will help and, so far we haven't used the kernel version to achieve
> > something like this.
> > 
> 
> No, and this is outside the remit of xfstest. Anyone who is running
> xfstest should ensure incompatible tests are excluded.

I don't think that's the case, we perfer test case detect required env
to run the test and _notrun if any condition not met. For regression
test for bug fix, we want the test to fail on old/un-patched kernel, but
for new features we need a way to tell if the kernel in test has the
feature or not.

Thanks,
Eryu