Enforcing quota for root user

Enforcing quota for root user

[Cyril Scetbon]

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Hi,

I'm trying to enforce quotas for the superuser without success. Can you tell me what I'm doing wrong ?

see http://pastebin.com/tpF6kVig <http://pastebin.com/tpF6kVig>

Thanks
-- 
Cyril SCETBON


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Re: Enforcing quota for root user

[Stan Hoeppner]

On 11/10/2014 04:46 PM, Cyril Scetbon wrote:
> Hi,
> 
> I'm trying to enforce quotas for the superuser without success. Can you
> tell me what I'm doing wrong ?

http://xfs.org/docs/xfsdocs-xml-dev/XFS_User_Guide/tmp/en-US/html/ch08s04.html

Look at the last line.

Cheers,
Stan

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Re: Enforcing quota for root user

[Cyril Scetbon]

That's what I've read first, but someone showed me a sample where it works. He just told me he was using project quota. However, does it make sense ? 
I've also read somewhere else that quota is never enforced for root user (id,gid=0) that's why I was testing it ....
-- 
Cyril SCETBON

> On 11 Nov 2014, at 07:56, Stan Hoeppner <stan@hardwarefreak.com> wrote:
> 
> 
> 
> On 11/10/2014 04:46 PM, Cyril Scetbon wrote:
>> Hi,
>> 
>> I'm trying to enforce quotas for the superuser without success. Can you
>> tell me what I'm doing wrong ?
> 
> http://xfs.org/docs/xfsdocs-xml-dev/XFS_User_Guide/tmp/en-US/html/ch08s04.html
> 
> Look at the last line.
> 
> Cheers,
> Stan
> 

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Re: Enforcing quota for root user

[Stan Hoeppner]

On 11/11/2014 04:22 AM, Cyril Scetbon wrote:
> That's what I've read first, but someone showed me a sample where it works. He just told me he was using project quota. However, does it make sense ? 
> I've also read somewhere else that quota is never enforced for root user (id,gid=0) that's why I was testing it ....

No, it doesn't make sense.  Why would you want to enforce quotas for root?

Regards,
Stan

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Re: Enforcing quota for root user

[Chris Murphy]

On Nov 11, 2014, at 8:36 AM, Stan Hoeppner <stan@hardwarefreak.com> wrote:

> On 11/11/2014 04:22 AM, Cyril Scetbon wrote:
>> That's what I've read first, but someone showed me a sample where it works. He just told me he was using project quota. However, does it make sense ? 
>> I've also read somewhere else that quota is never enforced for root user (id,gid=0) that's why I was testing it ....
> 
> No, it doesn't make sense.  Why would you want to enforce quotas for root?

A week ago I tried this and project quotas appear to apply to root.

[root@localhost project_quota_test1]# xfs_quota -c df
Filesystem           1K-blocks       Used  Available  Use% Pathname
/dev/sdb              83845120     157980   83687140    0% /xfs_local
/dev/sdb                102400     124928 9223372036854753280  122% /xfs_local/project_quota_test1
[root@localhost project_quota_test1]# dd if=/dev/zero of=test100MB bs=1M count=100
dd: error writing ‘test100MB’: No space left on device
79+0 records in
78+0 records out
81788928 bytes (82 MB) copied, 0.163849 s, 499 MB/s
[root@localhost project_quota_test1]# xfs_quota -c df
Filesystem           1K-blocks       Used  Available  Use% Pathname
/dev/sdb              83845120     237748   83607372    0% /xfs_local
/dev/sdb                102400     204800 9223372036854673408  200% /xfs_local/project_quota_test1


The available space value seems like a bug, at least it’s not a sane/helpful value. But I do get a no space left on device, and the file being written is truncated at the hard limit for that project (directory).


Chris Murphy
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Re: Enforcing quota for root user

[Dave Chinner]

On Tue, Nov 11, 2014 at 11:00:25AM -0700, Chris Murphy wrote:
> 
> On Nov 11, 2014, at 8:36 AM, Stan Hoeppner <stan@hardwarefreak.com> wrote:
> 
> > On 11/11/2014 04:22 AM, Cyril Scetbon wrote:
> >> That's what I've read first, but someone showed me a sample where it works. He just told me he was using project quota. However, does it make sense ? 
> >> I've also read somewhere else that quota is never enforced for root user (id,gid=0) that's why I was testing it ....
> > 
> > No, it doesn't make sense.  Why would you want to enforce quotas for root?
> 
> A week ago I tried this and project quotas appear to apply to root.

By intent and design. Project quotas are not a user/group based
quota and so there is no exemption for any user.

> [root@localhost project_quota_test1]# xfs_quota -c df
> Filesystem           1K-blocks       Used  Available  Use% Pathname
> /dev/sdb              83845120     157980   83687140    0% /xfs_local
> /dev/sdb                102400     124928 9223372036854753280  122% /xfs_local/project_quota_test1
> [root@localhost project_quota_test1]# dd if=/dev/zero of=test100MB bs=1M count=100
> dd: error writing ‘test100MB’: No space left on device
> 79+0 records in
> 78+0 records out
> 81788928 bytes (82 MB) copied, 0.163849 s, 499 MB/s
> [root@localhost project_quota_test1]# xfs_quota -c df
> Filesystem           1K-blocks       Used  Available  Use% Pathname
> /dev/sdb              83845120     237748   83607372    0% /xfs_local
> /dev/sdb                102400     204800 9223372036854673408  200% /xfs_local/project_quota_test1

It's gone negative. That number in hex: 0x7FFFFFFFFFFE7000

What kernel are you using, and can you outline all the way you set
everything up to cause that to occur? Also, what is the output of a
plain 'df -h' when it is in that state?

Cheers,

Dave.

-- 
Dave Chinner
david@fromorbit.com

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Re: Enforcing quota for root user

[Eric Sandeen]

On 11/11/14 4:32 PM, Dave Chinner wrote:
> On Tue, Nov 11, 2014 at 11:00:25AM -0700, Chris Murphy wrote:
>>
>> On Nov 11, 2014, at 8:36 AM, Stan Hoeppner <stan@hardwarefreak.com> wrote:
>>
>>> On 11/11/2014 04:22 AM, Cyril Scetbon wrote:
>>>> That's what I've read first, but someone showed me a sample where it works. He just told me he was using project quota. However, does it make sense ? 
>>>> I've also read somewhere else that quota is never enforced for root user (id,gid=0) that's why I was testing it ....
>>>
>>> No, it doesn't make sense.  Why would you want to enforce quotas for root?
>>
>> A week ago I tried this and project quotas appear to apply to root.
> 
> By intent and design. Project quotas are not a user/group based
> quota and so there is no exemption for any user.

However, at least according to the manpage, "project ID 0" is not
enforced.  Granted, that is not a *user* exception.

-Eric

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Re: Enforcing quota for root user

[Dave Chinner]

On Tue, Nov 11, 2014 at 04:36:43PM -0600, Eric Sandeen wrote:
> On 11/11/14 4:32 PM, Dave Chinner wrote:
> > On Tue, Nov 11, 2014 at 11:00:25AM -0700, Chris Murphy wrote:
> >>
> >> On Nov 11, 2014, at 8:36 AM, Stan Hoeppner <stan@hardwarefreak.com> wrote:
> >>
> >>> On 11/11/2014 04:22 AM, Cyril Scetbon wrote:
> >>>> That's what I've read first, but someone showed me a sample where it works. He just told me he was using project quota. However, does it make sense ? 
> >>>> I've also read somewhere else that quota is never enforced for root user (id,gid=0) that's why I was testing it ....
> >>>
> >>> No, it doesn't make sense.  Why would you want to enforce quotas for root?
> >>
> >> A week ago I tried this and project quotas appear to apply to root.
> > 
> > By intent and design. Project quotas are not a user/group based
> > quota and so there is no exemption for any user.
> 
> However, at least according to the manpage, "project ID 0" is not
> enforced.  Granted, that is not a *user* exception.

Correct, and again by intent and design as project quotas are
optional.  i.e. there has to be some way of ensuring non-project ID
controlled files won't have quota enforcement applied to them. ;)

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

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Re: Enforcing quota for root user

[Chris Murphy]

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On Nov 11, 2014, at 3:32 PM, Dave Chinner <david@fromorbit.com> wrote:

> On Tue, Nov 11, 2014 at 11:00:25AM -0700, Chris Murphy wrote:
>> 
>> On Nov 11, 2014, at 8:36 AM, Stan Hoeppner <stan@hardwarefreak.com> wrote:
>> 
>>> On 11/11/2014 04:22 AM, Cyril Scetbon wrote:
>>>> That's what I've read first, but someone showed me a sample where it works. He just told me he was using project quota. However, does it make sense ? 
>>>> I've also read somewhere else that quota is never enforced for root user (id,gid=0) that's why I was testing it ....
>>> 
>>> No, it doesn't make sense.  Why would you want to enforce quotas for root?
>> 
>> A week ago I tried this and project quotas appear to apply to root.
> 
> By intent and design. Project quotas are not a user/group based
> quota and so there is no exemption for any user.

It’s what I’d expect. I considered the documentation to be slightly misleading where is says soft and hard limits are never applied to the root user. The project quota does have a soft and hard limit. The soft limit, seemed not to apply to the root user - at least there was no soft limit warning anywhere when it was busted. But the hard limit definitely applied.

http://xfs.org/docs/xfsdocs-xml-dev/XFS_User_Guide/tmp/en-US/html/ch08s04.html


> 
>> [root@localhost project_quota_test1]# xfs_quota -c df
>> Filesystem           1K-blocks       Used  Available  Use% Pathname
>> /dev/sdb              83845120     157980   83687140    0% /xfs_local
>> /dev/sdb                102400     124928 9223372036854753280  122% /xfs_local/project_quota_test1
>> [root@localhost project_quota_test1]# dd if=/dev/zero of=test100MB bs=1M count=100
>> dd: error writing ‘test100MB’: No space left on device
>> 79+0 records in
>> 78+0 records out
>> 81788928 bytes (82 MB) copied, 0.163849 s, 499 MB/s
>> [root@localhost project_quota_test1]# xfs_quota -c df
>> Filesystem           1K-blocks       Used  Available  Use% Pathname
>> /dev/sdb              83845120     237748   83607372    0% /xfs_local
>> /dev/sdb                102400     204800 9223372036854673408  200% /xfs_local/project_quota_test1
> 
> It's gone negative. That number in hex: 0x7FFFFFFFFFFE7000
> 
> What kernel are you using, and can you outline all the way you set
> everything up to cause that to occur? Also, what is the output of a
> plain 'df -h' when it is in that state?

No that VM is gone so I can’t check it, I’d have to redo the test. Since at the time I was also testing Btrfs stuff I’m going to say it was at the oldest 3.17.1, and could have been 3.18rc1 or rc2.


Chris Murphy

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Re: Enforcing quota for root user

[Dave Chinner]

On Tue, Nov 11, 2014 at 04:35:31PM -0700, Chris Murphy wrote:
> 
> On Nov 11, 2014, at 3:32 PM, Dave Chinner <david@fromorbit.com>
> wrote:
> 
> > On Tue, Nov 11, 2014 at 11:00:25AM -0700, Chris Murphy wrote:
> >> 
> >> On Nov 11, 2014, at 8:36 AM, Stan Hoeppner
> >> <stan@hardwarefreak.com> wrote:
> >> 
> >>> On 11/11/2014 04:22 AM, Cyril Scetbon wrote:
> >>>> That's what I've read first, but someone showed me a sample
> >>>> where it works. He just told me he was using project quota.
> >>>> However, does it make sense ?  I've also read somewhere else
> >>>> that quota is never enforced for root user (id,gid=0) that's
> >>>> why I was testing it ....
> >>> 
> >>> No, it doesn't make sense.  Why would you want to enforce
> >>> quotas for root?
> >> 
> >> A week ago I tried this and project quotas appear to apply to
> >> root.
> > 
> > By intent and design. Project quotas are not a user/group based
> > quota and so there is no exemption for any user.
> 
> It’s what I’d expect. I considered the documentation to be
> slightly misleading where is says soft and hard limits are never
> applied to the root user. The project quota does have a soft and
> hard limit. The soft limit, seemed not to apply to the root user -
> at least there was no soft limit warning anywhere when it was
> busted. But the hard limit definitely applied.
> 
> http://xfs.org/docs/xfsdocs-xml-dev/XFS_User_Guide/tmp/en-US/html/ch08s04.html

So write a patch to fix the documentation. Repo is here:

git://git.kernel.org/pub/scm/fs/xfs/xfsdocs-xml-dev.git

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

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Re: Enforcing quota for root user

[Cyril Scetbon]

-- 
Cyril SCETBON

> On 11/11/2014 04:22 AM, Cyril Scetbon wrote:
>> That's what I've read first, but someone showed me a sample where it works. He just told me he was using project quota. However, does it make sense ? 
>> I've also read somewhere else that quota is never enforced for root user (id,gid=0) that's why I was testing it ....
> 
> No, it doesn't make sense.  

Cool I'm not crazy :)

> Why would you want to enforce quotas for root?

Cause I'm using a software that must be launched as root (a limitation that should be removed in the future) and I want to apply quota to that one !

> Regards,
> Stan

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