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Re: Enforcing quota for root user

To: Chris Murphy <lists@xxxxxxxxxxxxxxxxx>
Subject: Re: Enforcing quota for root user
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Wed, 12 Nov 2014 09:32:03 +1100
Cc: Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx>, xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <631A9090-F9FE-4B8E-88CD-1B30CAFC65B7@xxxxxxxxxxxxxxxxx>
References: <67EDE14C-CCFB-4B42-8B78-FC6C813CD19A@xxxxxxx> <5461B333.8050609@xxxxxxxxxxxxxxxxx> <F7ACFF71-460D-40E7-999C-BFC8D232EA81@xxxxxxx> <54622CE8.7050508@xxxxxxxxxxxxxxxxx> <631A9090-F9FE-4B8E-88CD-1B30CAFC65B7@xxxxxxxxxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Tue, Nov 11, 2014 at 11:00:25AM -0700, Chris Murphy wrote:
> 
> On Nov 11, 2014, at 8:36 AM, Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx> 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 âtest100MBâ: 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@xxxxxxxxxxxxx

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