Re: btrfs thinks fs is full, though 11GB should be still free

[Goffredo Baroncelli <kreijack@inwind.it>]

On 19/12/2023 09.22, Andrei Borzenkov wrote:
> On Tue, Dec 19, 2023 at 4:00 AM Christoph Anton Mitterer
> <calestyo@scientia.org> wrote:
>
> 
> /data/main/prometheus/metrics2/01HHFEZPJ8TPFVYTXV11R7ZH4X/chunks/000001
> Processed 1 file, 1 regular extents (1 refs), 0 inline.
> Type       Perc     Disk Usage   Uncompressed Referenced
> TOTAL      100%      256M         256M          15M
> none       100%      256M         256M          15M
> 
> I would try to find out whether this single extent is shared, where
> the data is located inside this extent. Could it be that file was
> truncated or the hole was punched in it?
> 

Ok, now we have the case study.
To be sure, could you try a defrag (+ sync) of this single file ?

The what is the lsof output ?

Does anyone know a way to extract the "owners" of an extent ? I think that
we should go through the backref, but I never did. I don't want to
re-invent the wheel, so I am asking if someone knows a tool that can
help to find the owners of a extent.

BR

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