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 at 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 at 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 at 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 at 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 at fromorbit.com