BTRFS subvolume quota limits

BTRFS subvolume quota limits

[Karol Šebesta]

Hello,

Is there any possibility to set quota limit for subvolume created in
BTRFS pool as in Solaris ZFS?

I'm currently testing btrfs and I have a pool /home with two
partitions (disks) and three subvolumes on it:

Label: none =A0uuid: b742c9c7-162b-40d1-9186-f1c84418ff53
=A0 =A0 =A0 =A0Total devices 2 FS bytes used 513.02MB
=A0 =A0 =A0 =A0devid =A0 =A02 size 20.00GB used 1.26GB path /dev/sdb
=A0 =A0 =A0 =A0devid =A0 =A01 size 5.00GB used 1.26GB path /dev/sda6


BTRFS:/ # btrfs subvolume list /home
ID 257 top level 5 path Download
ID 258 top level 5 path Test
ID 261 top level 5 path Test2
BTRFS:/ #

These subvolumes are mounted as /apps, /Test and /Test2

/dev/sda6 =A0 =A0 =A0 =A025G =A0514M =A09.0G =A0 6% /home
/dev/sdb =A0 =A0 =A0 =A0 25G =A0514M =A09.0G =A0 6% /apps
/dev/sdb =A0 =A0 =A0 =A0 25G =A0514M =A09.0G =A0 6% /Test
/dev/sdb =A0 =A0 =A0 =A0 25G =A0514M =A09.0G =A0 6% /Test2

In Solaris ZFS I can use:

Example:

zfs set quota=3D1G home/Download =A0 --> and /apps will be have 1GB siz=
e
zfs set quota=3D5G home/Test =A0 --> and /Test will be have 5GB size
zfs set quota=3D10G home/Test2 =A0 --> and /Test2 will be have 10GB siz=
e

And in pool /home will be still 9GB free space for future extends.

It is possible in BTRFS? I know there is "btrfs filesystem resize" but
this only resize/reduce the whole /home pool and not set quota on
subvolumes as I need.

Any help is appreciated.

Thank you.
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Re: BTRFS subvolume quota limits

[dima]

On 11/21/2011 06:50 AM, Karol =C5=A0ebesta wrote:
> Hello,
>
> Is there any possibility to set quota limit for subvolume created in
> BTRFS pool as in Solaris ZFS?

Hi
Quotas are not implemented yet in btrfs as far as I know.
~dima
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Re: BTRFS subvolume quota limits

[Arne Jansen]

On 11/21/2011 05:15 AM, dima wrote:
> On 11/21/2011 06:50 AM, Karol =C5=A0ebesta wrote:
>> Hello,
>>
>> Is there any possibility to set quota limit for subvolume created in
>> BTRFS pool as in Solaris ZFS?
>=20
> Hi
> Quotas are not implemented yet in btrfs as far as I know.

This type of quota is implemented, but not merged yet. Please see
my qgroup patchset "Subvolume Quota Groups". Testers welcome :)

-Arne

> ~dima
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