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Subject: Re: Report correct filesystem usage / limits on BTRFS subvolumes with
 quota
To: Tomasz Pala <gotar@polanet.pl>
Cc: Qu Wenruo <quwenruo.btrfs@gmx.com>, linux-btrfs@vger.kernel.org
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From: Andrei Borzenkov <arvidjaar@gmail.com>
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Date: Sat, 11 Aug 2018 08:46:52 +0300
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10.08.2018 10:33, Tomasz Pala пишет:
> On Fri, Aug 10, 2018 at 07:03:18 +0300, Andrei Borzenkov wrote:
> 
>>> So - the limit set on any user
>>
>> Does btrfs support per-user quota at all? I am aware only of per-subvolume quotas.
> 
> Well, this is a kind of deceptive word usage in "post-truth" times.
> 
> In this case both "user" and "quota" are not valid...
> - by "user" I ment general word, not unix-user account; such user might
>   possess some container running full-blown guest OS,
> - by "quota" btrfs means - I guess, dataset-quotas?
> 
> 
> In fact: https://btrfs.wiki.kernel.org/index.php/Quota_support
> "Quota support in BTRFS is implemented at a subvolume level by the use of quota groups or qgroup"
> 
> - what the hell is "quota group" and how it differs from qgroup? According to btrfs-quota(8):
> 
> "The quota groups (qgroups) are managed by the subcommand btrfs qgroup(8)"
> 
> - they are the same... just completely different from traditional "quotas".
> 
> 
> My suggestion would be to completely remove the standalone "quota" word
> from btrfs documentation - there is no "quota", just "subvolume quota"
> or "qgroup" supported.
> 

Well, qgroup allows you to limit amount of data that can be stored in
subvolume (or under quota group in general), so it behaves like
traditional quota to me.