qgroup limit clearing, was Re: Btrfs progs release 4.1

[Christian Robottom Reis <kiko@canonical.com>]

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?
-- 
Christian Robottom Reis   | [+1] 612 888 4935    | http://launchpad.net/~kiko
Canonical VP Hyperscale   | [+55 16] 9 9112 6430
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