Re: qgroup limit clearing, was Re: Btrfs progs release 4.1

[Tsutomu Itoh <t-itoh@jp.fujitsu.com>]

On 2015/06/23 3:18, Christian Robottom Reis wrote:
> On Mon, Jun 22, 2015 at 05:00:23PM +0200, David Sterba wrote:
>>    - qgroup:
>>      - show: distinguish no limits and 0 limit value
>>      - limit: ability to clear the limit
>
> I'm using kernel 4.1-rc7 as per:
>
>      root@riff:/var/lib/lxc/juju-trusty-lxc-template/rootfs# uname -a
>      Linux riff 4.1.0-040100rc7-generic #201506080035 SMP Mon Jun 8 04:36:20 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
>
> But apart from still having major issues with qgroups (quota enforcement
> triggers even when there seems to be plenty of free space) clearing
> limits with btrfs-progs 4.1 doesn't revert back to 'none', instead
> confusingly setting the quota to 16EiB. Using:
>
>      root@riff:/var/lib/lxc/juju-trusty-lxc-template/rootfs# btrfs version
>      btrfs-progs v4.1
>
> I start from:
>
>      qgroupid         rfer         excl     max_rfer     max_excl
>      --------         ----         ----     --------     --------
>      0/5           2.15GiB      1.95GiB         none         none
>      0/261         1.42GiB      1.11GiB         none    100.00GiB
>      0/265         1.09GiB    600.59MiB         none    100.00GiB
>      0/271       793.32MiB    366.40MiB         none    100.00GiB
>      0/274       514.96MiB    142.92MiB         none    100.00GiB
>
> I then issue:
>
>      root@riff# btrfs qgroup limit -e none 261 /var
>      root@riff# btrfs qgroup limit none 261 /var
>
> I end up with:
>
>      qgroupid         rfer         excl     max_rfer     max_excl
>      --------         ----         ----     --------     --------
>      0/5           2.15GiB      1.95GiB         none         none
>      0/261         1.42GiB      1.11GiB     16.00EiB     16.00EiB
>      0/265         1.09GiB    600.59MiB         none    100.00GiB
>      0/271       793.32MiB    366.40MiB         none    100.00GiB
>      0/274       514.96MiB    142.92MiB         none    100.00GiB
>
> Is that expected?
>

The following fix is necessary for the kernel to display it correctly.

  [PATCH] btrfs: qgroup: allow user to clear the limitation on qgroup
  http://marc.info/?l=linux-btrfs&m=143331495409594&w=2

Thanks,
Tsutomu


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