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Re: [PATCH 4/8] Add test of quota accounting using fsx

To: Jan Kara <jack@xxxxxxx>
Subject: Re: [PATCH 4/8] Add test of quota accounting using fsx
From: Eric Sandeen <sandeen@xxxxxxxxxxx>
Date: Thu, 10 Jun 2010 11:50:59 -0500
Cc: hch@xxxxxxxxxxxxx, xfs@xxxxxxxxxxx
In-reply-to: <20100610105813.GB10827@xxxxxxxxxxxxx>
References: <1274710459-11446-1-git-send-email-jack@xxxxxxx> <1274710459-11446-5-git-send-email-jack@xxxxxxx> <4C0FD43D.3040803@xxxxxxxxxxx> <20100610105813.GB10827@xxxxxxxxxxxxx>
User-agent: Thunderbird 2.0.0.24 (Macintosh/20100228)
Jan Kara wrote:
> On Wed 09-06-10 12:49:49, Eric Sandeen wrote:
>> Jan Kara wrote:
>>> Run fsx (and also several fsx threads in parallel) and verify that
>>> quota accounting is correct after they finish.
>> Jan, I'm having trouble with this one on XFS for some reason, with our 
>> RHEL6 kernel and quota-3.17...
>>
>> +Disabling group quota enforcement and accounting on 
>> /dev/mapper/VolGroup00-testvol2
>> +Disabling user quota enforcement and accounting on 
>> /dev/mapper/VolGroup00-testvol2
>> +repquota: Mountpoint (or device) /mnt/testarea/scratch not found or has no 
>> quota enabled.
>> +repquota: Not all specified mountpoints are using quota.
>> +repquota: Mountpoint (or device) /mnt/testarea/scratch not found or has no 
>> quota enabled.
>> +repquota: Not all specified mountpoints are using quota.
>>
>> ...
>>
>> however if I remove the quotaon calls (off / on settings) in check_usage()
>> then it works:
>>
>> check_usage()
>> {
>>         # quotaon -f -u -g $SCRATCH_MNT 2>/dev/null
>>         repquota -u -g $SCRATCH_MNT  | grep -v "^root" | filter_scratch \
>>                 >$tmp.orig
>>         quotacheck -u -g $SCRATCH_MNT 2>/dev/null
>>         repquota -u -g $SCRATCH_MNT  | grep -v "^root" | filter_scratch \
>>                 >$tmp.checked
>>         # quotaon -u -g $SCRATCH_MNT 2>/dev/null
>>         diff $tmp.orig $tmp.checked
>> }
>>
>>
>> Seems like 2 issues: noisy disable messages, and repquota failing when 
>> disabled.
>   I've fixed noisy disable messages in quotaon (without -v flag only errors
> should be printed) in CVS. 

Ok, we should probably just add a filter for these so that it'll work
on older versions.

> With repquota & disabled quotas it's a bit more
> complicated. 

Hm I'm still woefully unfamiliar with quota intricacies.

It seems that after quotaon -f, repquota fails on xfs but works for ext*?

Not sure if that's intended...

Also is there a reason to disable quota before repquota?  Is disable/enable
around quotacheck enough?

Hm on ext* I'm also getting differences from the expected output; I suspect
due to selinux xattrs.  I'll try to get that fixed up.

> The problem is that for ext?, reiserfs,... you have to disable
> quotas before running quotacheck. Also quotacheck is NOP for XFS - we'd
> rather need to call something to really recompute quota usage for XFS. How
> that can be done?

It's regenerated at mount time if needed.  I don't know that we have a
method to force this recalculation...  I guess mounting with quotas disabled,
unmounting, then mounting again w/ quotas on will do it.

Thanks,
-Eric

>                                                                       Honza

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