From: Qu Wenruo <quwenruo.btrfs@gmx.com>
To: Andrei Borzenkov <arvidjaar@gmail.com>,
"linux-btrfs@vger.kernel.org" <linux-btrfs@vger.kernel.org>
Subject: Re: Non-existent qgroup in parent-child relation prevents makes qgroup commands fail
Date: Sat, 3 Aug 2019 07:09:44 +0800 [thread overview]
Message-ID: <5dcb6a1b-42db-cc84-a403-288b30c2842b@gmx.com> (raw)
In-Reply-To: <665ad51a-def8-b60a-8ea2-b76e46f306d2@gmail.com>
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On 2019/8/3 上午2:08, Andrei Borzenkov wrote:
> bor@tw:~> sudo btrfs qgroup show .
> ERROR: cannot find the qgroup 0/789
> bor@tw:~>
>
> Fine. This openSUSE with snapper which creates and automatically
> destroys snapshots and apparently either kernel or snapper now also
> remove corresponding qgroup. I played with snapshots and created several
> top level qgroups that included snapshot qgroups existing at this time.
> Now these snapshots are gone, their qgroups are gone ...
Kernel version please.
IIRC latest upstream kernel doesn't remove the level 0 qgroup.
It may be the userspace doing it improperly.
> and what can I
> do? I have no way to even know what is wrong because the very command
> that shows it fails immediately.
>
> bor@tw:~/python-btrfs/examples> sudo ./show_tree_keys.py 8 . | grep 0/789
> (0/789 QGROUP_RELATION 2/792)
> (0/789 QGROUP_RELATION 2/793)
> (0/789 QGROUP_RELATION 2/795)
> (0/789 QGROUP_RELATION 2/799)
> (0/789 QGROUP_RELATION 2/800)
> (0/789 QGROUP_RELATION 2/803)
> (0/789 QGROUP_RELATION 2/804)
> (0/789 QGROUP_RELATION 2/805)
> (0/789 QGROUP_RELATION 2/806)
> (0/789 QGROUP_RELATION 2/807)
> (0/789 QGROUP_RELATION 2/808)
> (0/789 QGROUP_RELATION 2/809)
> (0/789 QGROUP_RELATION 2/814)
> (0/789 QGROUP_RELATION 2/818)
> (0/789 QGROUP_RELATION 2/819)
> (2/792 QGROUP_RELATION 0/789)
> (2/793 QGROUP_RELATION 0/789)
> (2/795 QGROUP_RELATION 0/789)
> (2/799 QGROUP_RELATION 0/789)
> (2/800 QGROUP_RELATION 0/789)
> (2/803 QGROUP_RELATION 0/789)
> (2/804 QGROUP_RELATION 0/789)
> (2/805 QGROUP_RELATION 0/789)
> (2/806 QGROUP_RELATION 0/789)
> (2/807 QGROUP_RELATION 0/789)
> (2/808 QGROUP_RELATION 0/789)
> (2/809 QGROUP_RELATION 0/789)
> (2/814 QGROUP_RELATION 0/789)
> (2/818 QGROUP_RELATION 0/789)
> (2/819 QGROUP_RELATION 0/789)
> bor@tw:~/python-btrfs/examples>
>
> And even if I find it out, I cannot fix it anyway
Furthermore, latest kernel should automatically remove the relation when
deleting the qgroup.
Would you please provide the (minimal) script/reproducer causing the
situation and kernel version?
Thanks,
Qu
>
> bor@tw:~/python-btrfs/examples> sudo btrfs qgroup remove 0/789 2/792 .
> ERROR: unable to assign quota group: Invalid argument
> bor@tw:~/python-btrfs/examples>
>
> I can remove parent qgroup, but it does not clean up parent-child
> relationship
>
> bor@tw:~/python-btrfs/examples> sudo btrfs qgroup destroy 2/792 .
> bor@tw:~/python-btrfs/examples> sudo ./show_tree_keys.py 8 . | grep 2/792
> (0/789 QGROUP_RELATION 2/792)
> (2/792 QGROUP_RELATION 0/789)
> bor@tw:~/python-btrfs/examples>
>
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next prev parent reply other threads:[~2019-08-02 23:09 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-02 18:08 Non-existent qgroup in parent-child relation prevents makes qgroup commands fail Andrei Borzenkov
2019-08-02 23:09 ` Qu Wenruo [this message]
2019-08-03 5:31 ` Andrei Borzenkov
2019-08-03 6:17 ` Qu Wenruo
2019-08-03 6:49 ` Andrei Borzenkov
2019-08-03 7:03 ` Qu Wenruo
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