Dovecot/doveadm quota

[Martynas Bendorius]

In webhosting customers usually see their physical disk usage used (quota on filesystem), and it causes a lot of confusion when numbers don't match with doveadm quota at all.

What's your opinion on these:
1) Should indexes (including FTS indexes stored in Maildir) be counted in the mail quota?
2) Shouldn't doveadm quota have a flag for real disk usage, so that if emails are compressed, their real size would be quoted?
3) Shouldn't dovecot rely on st_blocks instead of fstat's st_size? (a benefit for this: in this case converted maildir files without S=... would still be counted into the space used)

A short yes/no to 1, 2, 3 would be appreciated.

Thank you!

--
Best regards,
Martynas Bendorius


> On 2020-02-12, at 14:21, Aki Tuomi <aki.tuomi at open-xchange.com> wrote:
> 
> I think that most admins do not really care about physical disk usage as
> long as it's not exceeded, and most service providers prefer calculating
> quota against apparent usage instead of real usage, so they can charge
> you for that.
> 
> Aki
> 
> On 8.2.2020 18.16, Martynas Bendorius wrote:
>> Doesn't it currently confuse them? Because they'd reach their quota, while actually there would be a lot of disk space left :) + their whole mailbox could take a lot more space due to indexes and other files in the filesystem, and quota would not be reached.
>> 
>> Also, I've dovecot is using fstat's st_size parameter. This is not "correct", in that the actual space used on disk is always higher.
>> 
>> If we count the number of 512B blocks used (st_blocks), and multiply by 512 to get the true disk usage.
>> 
>> I'll be looking forward for your feedback/ideas.
>> 
>> Thank you!
>> 
>> --
>> Best regards,
>> Martynas Bendorius
>> 
>> 
>>> On 2020-02-08, at 17:57, Max Kostikov <max at kostikov.co> wrote:
>>> 
>>> I think these changes will confuse users because calculated quota wouldn't be equals with total messages sizes.
>>> 
>>> Marsistynas Bendorius писал 2020-02-07 11:07:
>>>> Is there any reason why dovecot relies on S= instead of real disk size
>>>> email takes?
>>>> 1) compressed mails take less than than the S= specified
>>>> 2) we could avoid using "S=" for the lookups and count every file
>>>> there, including indexes and mails without S=... if we'd read
>>>> filesizes
>>> 
>>> -- 
>>> With best regards,
>>> Max Kostikov
>>> 
>>> W: https://kostikov.co | DeltaChat: mk at eprove.net