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

[Christoph Anton Mitterer <calestyo@scientia.org>]

On Tue, 2023-12-12 at 09:50 +1030, Qu Wenruo wrote:
> Shows exactly which subvolumes uses how many bytes, including orphan
> ones which is pending for deletion.

Well... here we go:
# btrfs qgroup show .
Qgroupid    Referenced    Exclusive   Path 
--------    ----------    ---------   ---- 
0/5           16.00KiB     16.00KiB   <toplevel>
0/257         39.48GiB     39.48GiB   data
0/258         16.00KiB     16.00KiB   <stale>
0/259         16.00KiB     16.00KiB   a
0/260         16.00KiB     16.00KiB   b
1/100         32.00KiB     32.00KiB   <0 member qgroups>
1/101            0.00B        0.00B   <0 member qgroups>

I've just created a and b to get qgroup (somehow? ^^) working.


Nevertheless:
I'm 100% sure, that before, there were never any subvolumes on that fs
other than the toplevel and data, unless btrfs somehow creates/deletes
them automatically.


But the above output, AFAIU, still shows that "everything" is in data,
while counting the bytes of files there, still yields a much lower
number.


And other ideas what I could test?


Thanks,
Chris.