On Tue, Dec 16, 2014 at 11:15:37PM -0200, Christian Robottom Reis wrote:
> # btrfs qgroup limit 2000m 0/261 . && touch x
> touch: cannot touch ‘x’: Disk quota exceeded
>
> The strange thing is that it doesn't seem to be actually out of space:
>
> # btrfs qgroup show -p -r -e /var | grep 261
> 0/261 1111810048 391114752 2097152000 0 ---
Replying to myself as I had not yet been subscribed in time to receive a
reply; I just upgraded to 3.18.1 and am seeing the same issue on the
same subvolume (and on no others).
root@riff:/etc# uname -a
Linux riff 3.18.1-031801-generic #201412170637 SMP Wed Dec 17 11:38:50
UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
It's quite odd that this specific subvolume acts up, given that there
are quite a few others that are closer to the quota:
subvol group total unshared
-------------------------------------------------------------
(unknown) 0/5 1.37G / none 1.16G / none
lxc-template1/rootfs 0/259 0.68G / none 0.10G / 2.00G
machine-2/rootfs 0/261 1.07G / none 0.40G / 2.00G
machine-3/rootfs 0/265 1.17G / none 0.41G / 2.00G
lxc-template2/rootfs 0/271 0.77G / none 0.31G / 2.00G
lxc-template3/rootfs 0/274 0.46G / none 0.02G / 2.00G
machine-4/rootfs 0/283 7.12G / none 6.21G / 10.00G
machine-5/rootfs 0/288 1.05G / none 0.34G / 2.00G
machine-6/rootfs 0/289 11.33G / none 10.74G / 15.00G
machine-7/rootfs 0/290 1.30G / none 0.68G / 2.00G
machine-8/rootfs 0/292 1.00G / none 0.33G / 2.00G
machine-9/rootfs 0/293 1.17G / none 0.38G / 2.00G
machine-10/rootfs 0/306 1.34G / none 0.62G / 2.00G
machine-11/rootfs 0/318 9.49G / none 8.75G / 15.00G
lxc-template4/rootfs 0/320 0.79G / none 0.78G / 2.00G
machine-14/rootfs 0/323 1.10G / none 0.45G / 2.00G
The LWN article suggests that btrfs is quite conservative with quotas,
but shouldn't 265, 290, 306, 320 and 323 all be out of quota as well? Or
is there a lot else that goes into the calculation beyond the numbers
reported by btrfs qgroup show?
What could I do to help investigate further?
--
Christian Robottom Reis | [+55 16] 3376 0125 | http://async.com.br/~kiko
CEO, Async Open Source | [+55 16] 9 9112 6430 | http://launchpad.net/~kiko
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