Hello,
> I'm trying to use this feature of qgroup:
>
> btrfs qgroup assign <srcid> <destid> <path>
> Assigns the lower level qgroup src to the higher level qgroup dest
> in the btrfs found in <path>. It is used to build qgroup
> hierarchies.
>
>
> However, I fail to understand how this feature should work, and I'm
> getting "ERROR: bad relation requested":
>
> # btrfs sub create test1
> Create subvolume './test1'
>
> # btrfs sub create test2
> Create subvolume './test2'
>
> # btrfs sub list /mnt/lxc2 | grep test
> ID 1177 gen 85131 top level 5 path test1
> ID 1178 gen 85132 top level 5 path test2
>
> # btrfs qgroup show /mnt/lxc2
> 0/1177 4096 4096
> 0/1178 4096 4096
>
> # btrfs qgroup assign 1177 1178 /mnt/lx2
> ERROR: bad relation requested '/mnt/lx2'
>
>
> Could anyone give examples of proper usage of this feature?
>
Now qgroup require strict hierarchy. Every qgroup can be divided into
two parts:
<level>/id
Btrfs group assign requires parent's level > children's level, For your example
below, you can do like:
btrfs qgroup create 1/1 <mnt>
btrfs qgroup assign 1177 1/1 <mnt>
btrfs qgroup assign 1178 1/1 <mnt>
And if you want to limit subvol(1177), you can do
btrfs qgroup limit size 1177 <mnt>
Also, if you want to limit total size of 1177 and 1178, you
can set limit on qgroup 1/1.
Thanks,
Wang
> This is Linux 3.10.m
>
>
> --
> Tomasz Chmielewski
> http://wpkg.org
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