From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-it0-f65.google.com ([209.85.214.65]:37613 "EHLO mail-it0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727101AbeH1N0A (ORCPT ); Tue, 28 Aug 2018 09:26:00 -0400 Received: by mail-it0-f65.google.com with SMTP id h20-v6so1668657itf.2 for ; Tue, 28 Aug 2018 02:34:52 -0700 (PDT) MIME-Version: 1.0 From: Menion Date: Tue, 28 Aug 2018 11:34:40 +0200 Message-ID: Subject: 14Gb of space lost after distro upgrade on BTFS root partition (long thread with logs) To: linux-btrfs@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Sender: linux-btrfs-owner@vger.kernel.org List-ID: Hi all I have run a distro upgrade on my Ubuntu 16.04 that runs ppa kernel 4.17.2 with btrfsprogs 4.17.0 The root filesystem is BTRFS single created by the Ubuntu Xenial installer (so on kernel 4.4.0) on an internal mmc, located in /dev/mmcblk0p3 After the upgrade I have cleaned apt cache and checked the free space, the results were odd, following some checks (shrinked), followed by more comments: root@Menionubuntu:/home/menion# df -h Filesystem Size Used Avail Use% Mounted on ............................................................... /dev/mmcblk0p3 28G 24G 2.7G 90% / root@Menionubuntu:/home/menion# btrfs fi usage /usr Overall: Device size: 27.07GiB Device allocated: 25.28GiB Device unallocated: 1.79GiB Device missing: 0.00B Used: 23.88GiB Free (estimated): 2.69GiB (min: 2.69GiB) Data ratio: 1.00 Metadata ratio: 1.00 Global reserve: 72.94MiB (used: 0.00B) Data,single: Size:24.00GiB, Used:23.10GiB /dev/mmcblk0p3 24.00GiB Metadata,single: Size:1.25GiB, Used:801.97MiB /dev/mmcblk0p3 1.25GiB System,single: Size:32.00MiB, Used:16.00KiB /dev/mmcblk0p3 32.00MiB Unallocated: /dev/mmcblk0p3 1.79GiB root@Menionubuntu:/home/menion# btrfs fi df /mnt Data, single: total=24.00GiB, used=23.10GiB System, single: total=32.00MiB, used=16.00KiB Metadata, single: total=1.25GiB, used=801.92MiB GlobalReserve, single: total=72.89MiB, used=0.00B The different ways to check the free space are coherent, but if I check the directories usage on root, surprise: root@Menionubuntu:/home/menion# du -x -s -h /* 17M /bin 189M /boot 36K /dead.letter 0 /dev 18M /etc 6.1G /home 4.0K /initrd.img 4.0K /initrd.img.old 791M /lib 8.3M /lib64 0 /media 4.0K /mnt 0 /opt du: cannot access '/proc/24660/task/24660/fd/3': No such file or directory du: cannot access '/proc/24660/task/24660/fdinfo/3': No such file or directory du: cannot access '/proc/24660/fd/3': No such file or directory du: cannot access '/proc/24660/fdinfo/3': No such file or directory 0 /proc 2.9M /root 2.9M /run 17M /sbin 4.0K /snap 0 /srv 0 /sys 0 /tmp 6.1G /usr 2.0G /var 4.0K /vmlinuz 4.0K /vmlinuz.old 4.0K /webmin-setup.out The computed usage is 15Gb which is what I expected, so there are 9Gb lost somewhere. I have run scrub and then full balance with: btrfs scrub start / btrfs balance start / The balance freed 100Mb of space, it was running in background so I have checked dmesg when "btrfs balance status" said that was completed dmesg of balance: [47264.250141] BTRFS info (device mmcblk0p3): relocating block group 37154193408 flags system [47264.592082] BTRFS info (device mmcblk0p3): relocating block group 36046897152 flags data [47271.499809] BTRFS info (device mmcblk0p3): found 73 extents [47272.329921] BTRFS info (device mmcblk0p3): found 60 extents [47272.471059] BTRFS info (device mmcblk0p3): relocating block group 35778461696 flags metadata [47280.530041] BTRFS info (device mmcblk0p3): found 3199 extents [47280.735667] BTRFS info (device mmcblk0p3): relocating block group 34704719872 flags data [47301.460523] BTRFS info (device mmcblk0p3): relocating block group 37221302272 flags data [47306.038404] BTRFS info (device mmcblk0p3): found 5 extents [47306.481371] BTRFS info (device mmcblk0p3): found 5 extents [47306.673135] BTRFS info (device mmcblk0p3): relocating block group 37187747840 flags system [47306.874874] BTRFS info (device mmcblk0p3): found 1 extents [47307.073288] BTRFS info (device mmcblk0p3): relocating block group 34704719872 flags data [47371.059074] BTRFS info (device mmcblk0p3): found 16258 extents [47388.191208] BTRFS info (device mmcblk0p3): found 16094 extents [47388.985462] BTRFS info (device mmcblk0p3): relocating block group 31215058944 flags metadata [47439.164167] BTRFS info (device mmcblk0p3): found 7378 extents [47440.163793] BTRFS info (device mmcblk0p3): relocating block group 30141317120 flags data [47593.239048] BTRFS info (device mmcblk0p3): found 15636 extents [47618.389357] BTRFS info (device mmcblk0p3): found 15634 extents [47620.020122] BTRFS info (device mmcblk0p3): relocating block group 29012000768 flags data [47637.708444] BTRFS info (device mmcblk0p3): found 1154 extents [47639.757342] BTRFS info (device mmcblk0p3): found 1154 extents [47640.375483] BTRFS info (device mmcblk0p3): relocating block group 27938258944 flags data [47743.312441] BTRFS info (device mmcblk0p3): found 17009 extents [47756.928461] BTRFS info (device mmcblk0p3): found 17005 extents [47757.607346] BTRFS info (device mmcblk0p3): relocating block group 9416212480 flags metadata [47825.819449] BTRFS info (device mmcblk0p3): found 11503 extents [47826.465926] BTRFS info (device mmcblk0p3): relocating block group 8342470656 flags data [47900.754062] BTRFS info (device mmcblk0p3): found 20607 extents [47928.061348] BTRFS info (device mmcblk0p3): found 20607 extents [47929.125750] BTRFS info (device mmcblk0p3): relocating block group 4852809728 flags metadata [47993.308492] BTRFS info (device mmcblk0p3): found 13214 extents [47994.883308] BTRFS info (device mmcblk0p3): relocating block group 3779067904 flags data [48108.871895] BTRFS info (device mmcblk0p3): found 13256 extents [48124.623607] BTRFS info (device mmcblk0p3): found 13255 extents [48125.156150] BTRFS info (device mmcblk0p3): relocating block group 3510632448 flags metadata [48191.030178] BTRFS info (device mmcblk0p3): found 12394 extents [48193.202016] BTRFS info (device mmcblk0p3): relocating block group 2436890624 flags data [48347.733120] BTRFS info (device mmcblk0p3): found 22889 extents [48371.149135] BTRFS info (device mmcblk0p3): found 22889 extents [48373.723037] BTRFS info (device mmcblk0p3): relocating block group 20971520 flags metadata [48449.367016] BTRFS info (device mmcblk0p3): found 13755 extents [48451.058818] BTRFS info (device mmcblk0p3): relocating block group 12582912 flags data [48453.657685] BTRFS info (device mmcblk0p3): found 726 extents [48461.188484] BTRFS info (device mmcblk0p3): found 726 extents [48463.496116] BTRFS info (device mmcblk0p3): relocating block group 4194304 flags metadata [48476.405722] BTRFS info (device mmcblk0p3): found 403 extents [48479.254106] BTRFS info (device mmcblk0p3): 17 enospc errors during balance There is this enospc errors, can anyone help me in understanding what is going on? Bye