From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cn.fujitsu.com ([59.151.112.132]:34042 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1752576AbcHPBBt (ORCPT ); Mon, 15 Aug 2016 21:01:49 -0400 Subject: Re: btrfs quota issues To: Rakesh Sankeshi References:

CC: From: Qu Wenruo Message-ID: <4a941169-1845-ba0e-6102-39920e1364b9@cn.fujitsu.com> Date: Tue, 16 Aug 2016 09:01:33 +0800 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset="utf-8"; format=flowed Sender: linux-btrfs-owner@vger.kernel.org List-ID: At 08/16/2016 03:11 AM, Rakesh Sankeshi wrote: > yes, subvol level. > > qgroupid rfer excl max_rfer max_excl parent child > > -------- ---- ---- -------- -------- ------ ----- > > 0/5 16.00KiB 16.00KiB none none --- --- > > 0/258 119.48GiB 119.48GiB 200.00GiB none --- --- > > 0/259 92.57GiB 92.57GiB 200.00GiB none --- --- > > > although I have 200GB limit on 2 subvols, running into issue at about > 120 and 92GB itself 1) About workload Would you mind to mention the work pattern of your write? Just dd data with LZO compression? For compression part, it's a little complicated, as the reserved data size and on disk extent size are different. It's possible that at some code we leaked some reserved data space. 2) Behavior after EDQUOT And, after EDQUOT happens, can you write data into the subvolume? If you can still write a lot of data (at least several giga), it seems to be something related with temporary reserved space. If not, and even can't remove any file due to EQUOTA, then it's almost sure we have underflowed the reserved data. In that case, unmount and mount again will be the only workaround. (In fact, not workaround at all) 3) Behavior without compression If it's OK for you, would you mind to test it without compression? Currently we mostly use the assumption that on-disk extent size are the same with in-memory extent size (non-compression). So qgroup + compression is not the main concern before and is buggy. If without compression, qgroup works sanely, at least we can be sure that the cause is qgroup + compression. Thanks, Qu > > > On Sun, Aug 14, 2016 at 7:11 PM, Qu Wenruo wrote: >> >> >> At 08/12/2016 01:32 AM, Rakesh Sankeshi wrote: >>> >>> I set 200GB limit to one user and 100GB to another user. >>> >>> as soon as I reached 139GB and 53GB each, hitting the quota errors. >>> anyway to workaround quota functionality on btrfs LZO compressed >>> filesystem? >>> >> >> Please paste "btrfs qgroup show -prce " output if you are using btrfs >> qgroup/quota function. >> >> And, AFAIK btrfs qgroup is applied to subvolume, not user. >> >> So did you mean limit it to one subvolume belongs to one user? >> >> Thanks, >> Qu >> >>> >>> >>> 4.7.0-040700-generic #201608021801 SMP >>> >>> btrfs-progs v4.7 >>> >>> >>> Label: none uuid: 66a78faf-2052-4864-8a52-c5aec7a56ab8 >>> >>> Total devices 2 FS bytes used 150.62GiB >>> >>> devid 1 size 1.00TiB used 78.01GiB path /dev/xvdc >>> >>> devid 2 size 1.00TiB used 78.01GiB path /dev/xvde >>> >>> >>> Data, RAID0: total=150.00GiB, used=149.12GiB >>> >>> System, RAID1: total=8.00MiB, used=16.00KiB >>> >>> Metadata, RAID1: total=3.00GiB, used=1.49GiB >>> >>> GlobalReserve, single: total=512.00MiB, used=0.00B >>> >>> >>> Filesystem Size Used Avail Use% Mounted on >>> >>> /dev/xvdc 2.0T 153G 1.9T 8% /test_lzo >>> -- >>> To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in >>> the body of a message to majordomo@vger.kernel.org >>> More majordomo info at http://vger.kernel.org/majordomo-info.html >>> >>> >> >> > >