On 27/04/16 23:55, David Sterba wrote:
> On Thu, Mar 10, 2016 at 06:40:54PM +0100, David Sterba wrote:
>> On Thu, Mar 10, 2016 at 01:33:34PM +0500, Roman Mamedov wrote:
>>> On Thu, 10 Mar 2016 01:24:44 -0700
>>> Chris Murphy <li...@colorremedies.com> wrote:
>>>
>>>> kernel 4.5.0 rc7
>>>> btrfs-progs-4.4.1-1
>>>>
>>>> Summary: A new empty mixed block group "-M" filesystem shows up as
>>>> 100% full with regular df (gnu coreutils 8.24). Pretty sure this is
>>>> not a regression, but no regression testing done.
>>>>
>>>>
>>>> https://bugzilla.kernel.org/show_bug.cgi?id=114281
>>>
>>> Just guessing here, but this might be related?
>>>
>>>   [PATCH] btrfs: statfs: report zero available if metadata are exhausted
>>>   http://www.spinics.net/lists/linux-btrfs/msg48013.html
>>>
>>> Maybe some maths there are wrong in case of a mixed blockgroup filesystem.
>>
>> Yes it's caused by the referenced patch.  The statfs has been broken for
>> mixed blockgroups but the 100% used on empty filesystem looks weird, so
>> it's time to fix the mixed-bg case.
> 
> JFYI, fixed by Luis de Bethencourt and patches queued for 4.7
> 

Good to know the issue was important to some people :)
It was fun to fix.

David,
I have been travelling the last week. I will continue with my second bug this
weekend. [0] Sorry for the delay on this.

Thanks,
Luis


[0] btrfs fi usage crash when multiple device volume contains seed device
https://bugzilla.kernel.org/show_bug.cgi?id=115851


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