Re: Cannot create subvolume with quota enabled

[Andreas Philipp <philipp.andreas@gmail.com>]

Hi Arne,

On 08.09.2012 00:04, Arne Jansen wrote:
> Hi Andreas,
>
> On 09/07/2012 09:36 PM, Andreas Philipp wrote:
>> Hi,
>>
>> The following steps reproduce the error. My kernel is 3.6-rc4 and 
>> btrfs-progs are at commit 89fe5b5f666c247aa3173745fb87c710f3a71a4a
>> from 
>> git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-progs.git
>>
>>
> master.
>> thor ~ # mkfs.btrfs -L test /dev/vg1/test
>>
>> WARNING! - Btrfs Btrfs v0.19 IS EXPERIMENTAL WARNING! - see
>> http://btrfs.wiki.kernel.org before using
>>
>> fs created label test on /dev/vg1/test nodesize 4096 leafsize 4096
>> sectorsize 4096 size 20.00GB Btrfs Btrfs v0.19 thor ~ # mount
>> /dev/vg1/test /mnt/tmp thor ~ # btrfs quota enable /mnt/tmp thor ~
>> # btrfs subvolume create /mnt/tmp/test Create subvolume
>> '/mnt/tmp/test' ERROR: cannot create subvolume - Invalid argument
> Thanks for giving quota a try. I sent a fix separately with
> the subject
>
> [PATCH] Btrfs: btrfs_qgroup_inherit wrongly returns an error
>
> Could you please see if it fixes the problem?
With the patch applied (on top of either 3.6-rc4 or 3.6-rc5) I can
create subvolumes as you see below.

root@debian:~# mkfs.btrfs /dev/sdb

WARNING! - Btrfs Btrfs v0.19 IS EXPERIMENTAL
WARNING! - see http://btrfs.wiki.kernel.org before using

fs created label (null) on /dev/sdb
        nodesize 4096 leafsize 4096 sectorsize 4096 size 3.00GB
Btrfs Btrfs v0.19
root@debian:~# mount /dev/sdb /mnt/test
root@debian:~# btrfs quota enable /mnt/test
root@debian:~# btrfs subvolume create /mnt/test/subvolume
Create subvolume '/mnt/test/subvolume'
root@debian:~# btrfs qgroup show /mnt/test
0/257 4096 4096
root@debian:~# dd if=/dev/urandom of=/mnt/test/subvolume/testfile
bs=1024k count=25
25+0 records in
25+0 records out
26214400 bytes (26 MB) copied, 2.95321 s, 8.9 MB/s
root@debian:~# btrfs qgroup show /mnt/test
0/257 4096 4096
root@debian:~# du -hs /mnt/test/*
25M     /mnt/test/subvolume

At least I expected that the output of ' btrfs qgroup show' changes
after some data got written to a subvolume which is assigned to a
qgroup. (Hope, I got it right.)

Thanks,
Andreas

>
> Thanks,
> Arne
>> Please, do not hesitate to contact me for any further information
>> etc.
>>
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