Leszek Dubiel <[email protected]> writes:

>> What was this other system?  I'm curious because, as far as I know, no
>> distribution officially supports the use of "set-default-subvolume".
>
> I have tested it again.
> Setting default subvolume is not relevant in this case.
> This is debian, but settting default is what I used to do in the past.

Yes, I know it's not relevant to "reflinked files and error parent
determination failed".  The reason I ask is because the topic of
set-default-subvolume is being revisited in Debian.  So to be clear, the
"[an]other system" was also Debian?  I'd also sincerely appreciate it if
you would share your rationale for why you tried it, as well as why you
stopped using it.

> You subvolumes A and B were not in a relationship with subvolume C,
> so this was "user error".

To be fair, did you find that the documentation for "clones" was
insufficient?  It could be argued that an optimistic reading of the
btrfs-progs docs would lead a user to suppose something like "oh neat!
If I mark a bunch of subvolumes as clones then the kernel will figure
everything out automatically, deduplicate, and only send the diff".  If
that's the case then it's an upstream documentation bug!

> Please close the bug.

I would be happy to, but I just want to confirm there's nothing to fix/improve.

> Since 2019 I have learned Btrfs better,
> sorry for taking your time.

Truly, it's alright.  Thank you for taking the time to file a bug.
Also, sorry it took so long for someone to reply...I'm not sure why the
previous maintainers didn't bother to write a couple words.

Regards,
Nicholas

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