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[109.252.90.211]) by smtp.gmail.com with ESMTPSA id d10sm1221427ljc.15.2019.06.23.03.15.09 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 23 Jun 2019 03:15:09 -0700 (PDT) Subject: Re: Confused by btrfs quota group accounting To: Qu Wenruo , "linux-btrfs@vger.kernel.org" References: <669a0428-0517-a10e-c658-c8137463450a@gmx.com> From: Andrei Borzenkov Openpgp: preference=signencrypt Autocrypt: addr=arvidjaar@gmail.com; prefer-encrypt=mutual; keydata= xsDiBDxiRwwRBAC3CN9wdwpVEqUGmSoqF8tWVIT4P/bLCSZLkinSZ2drsblKpdG7x+guxwts +LgI8qjf/q5Lah1TwOqzDvjHYJ1wbBauxZ03nDzSLUhD4Ms1IsqlIwyTLumQs4vcQdvLxjFs G70aDglgUSBogtaIEsiYZXl4X0j3L9fVstuz4/wXtwCg1cN/yv/eBC0tkcM1nsJXQrC5Ay8D /1aA5qPticLBpmEBxqkf0EMHuzyrFlqVw1tUjZ+Ep2LMlem8malPvfdZKEZ71W1a/XbRn8FE SOp0tUa5GwdoDXgEp1CJUn+WLurR0KPDf01E4j/PHHAoABgrqcOTcIVoNpv2gNiBySVsNGzF XTeY/Yd6vQclkqjBYONGN3r9R8bWA/0Y1j4XK61qjowRk3Iy8sBggM3PmmNRUJYgroerpcAr 2byz6wTsb3U7OzUZ1Llgisk5Qum0RN77m3I37FXlIhCmSEY7KZVzGNW3blugLHcfw/HuCB7R 1w5qiLWKK6eCQHL+BZwiU8hX3dtTq9d7WhRW5nsVPEaPqudQfMSi/Ux1kc0mQW5kcmVpIEJv cnplbmtvdiA8YXJ2aWRqYWFyQGdtYWlsLmNvbT7CZQQTEQIAJQIbAwYLCQgHAwIGFQgCCQoL BBYCAwECHgECF4AFAliWAiQCGQEACgkQR6LMutpd94wFGwCeNuQnMDxve/Fo3EvYIkAOn+zE 21cAnRCQTXd1hTgcRHfpArEd/Rcb5+SczsBNBDxiRyQQBACQtME33UHfFOCApLki4kLFrIw1 5A5asua10jm5It+hxzI9jDR9/bNEKDTKSciHnM7aRUggLwTt+6CXkMy8an+tVqGL/MvDc4/R KKlZxj39xP7wVXdt8y1ciY4ZqqZf3tmmSN9DlLcZJIOT82DaJZuvr7UJ7rLzBFbAUh4yRKaN nwADBwQAjNvMr/KBcGsV/UvxZSm/mdpvUPtcw9qmbxCrqFQoB6TmoZ7F6wp/rL3TkQ5UElPR gsG12+Dk9GgRhnnxTHCFgN1qTiZNX4YIFpNrd0au3W/Xko79L0c4/49ten5OrFI/psx53fhY vLYfkJnc62h8hiNeM6kqYa/x0BEddu92ZG7CRgQYEQIABgUCPGJHJAAKCRBHosy62l33jMhd AJ48P7WDvKLQQ5MKnn2D/TI337uA/gCgn5mnvm4SBctbhaSBgckRmgSxfwQ= Message-ID: <7ecc3db3-7af7-f3cb-e23f-04c20f47dd8c@gmail.com> Date: Sun, 23 Jun 2019 13:15:02 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.1 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="P22tfS6FffGE7tNgX9vYphpputak2Si7Q" Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --P22tfS6FffGE7tNgX9vYphpputak2Si7Q Content-Type: multipart/mixed; boundary="1nB6cPI4iluQoGJsWvOyBnzAxG5RERR2N"; protected-headers="v1" From: Andrei Borzenkov To: Qu Wenruo , "linux-btrfs@vger.kernel.org" Message-ID: <7ecc3db3-7af7-f3cb-e23f-04c20f47dd8c@gmail.com> Subject: Re: Confused by btrfs quota group accounting References: <669a0428-0517-a10e-c658-c8137463450a@gmx.com> In-Reply-To: --1nB6cPI4iluQoGJsWvOyBnzAxG5RERR2N Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable 23.06.2019 11:08, Qu Wenruo =D0=BF=D0=B8=D1=88=D0=B5=D1=82: >=20 >=20 > On 2019/6/23 =E4=B8=8B=E5=8D=883:55, Qu Wenruo wrote: >> >> >> On 2019/6/22 =E4=B8=8B=E5=8D=8811:11, Andrei Borzenkov wrote: >> [snip] >>> >>> 10:/mnt # dd if=3D/dev/urandom of=3Dtest/file bs=3D1M count=3D100 see= k=3D0 >>> conv=3Dnotrunc >>> 100+0 records in >>> 100+0 records out >>> 104857600 bytes (105 MB, 100 MiB) copied, 0.685532 s, 153 MB/s >>> 10:/mnt # sync >>> 10:/mnt # btrfs qgroup show . >>> qgroupid rfer excl >>> -------- ---- ---- >>> 0/5 16.00KiB 16.00KiB >>> 0/258 1.01GiB 100.02MiB >>> 0/263 1.00GiB 85.02MiB >> >> Sorry, I can't really reproduce it. >> >> 5.1.12 kernel, using the following script: >> --- >> #!/bin/bash >> >> dev=3D"/dev/data/btrfs" >> mnt=3D"/mnt/btrfs" >> >> umount $dev &> /dev/null >> mkfs.btrfs -f $dev > /dev/null >> >> mount $dev $mnt >> btrfs sub create $mnt/subv1 >> btrfs quota enable $mnt >> btrfs quota rescan -w $mnt >> >> xfs_io -f -c "pwrite 0 1G" $mnt/subv1/file1 >> sync >> btrfs sub snapshot $mnt/subv1 $mnt/subv2 >> sync >> btrfs qgroup show -prce $mnt >> >> xfs_io -c "pwrite 0 100m" $mnt/subv1/file1 >> sync >> btrfs qgroup show -prce $mnt >> --- >> >> The result is: >> --- >> Create subvolume '/mnt/btrfs/subv1' >> wrote 1073741824/1073741824 bytes at offset 0 >> 1 GiB, 262144 ops; 0.5902 sec (1.694 GiB/sec and 444134.2107 ops/sec) >> Create a snapshot of '/mnt/btrfs/subv1' in '/mnt/btrfs/subv2' >> qgroupid rfer excl max_rfer max_excl parent c= hild >> -------- ---- ---- -------- -------- ------ -= ---- >> 0/5 16.00KiB 16.00KiB none none --- -= -- >> 0/256 1.00GiB 16.00KiB none none --- -= -- >> 0/259 1.00GiB 16.00KiB none none --- -= -- >> wrote 104857600/104857600 bytes at offset 0 >> 100 MiB, 25600 ops; 0.0694 sec (1.406 GiB/sec and 368652.9766 ops/sec)= >> qgroupid rfer excl max_rfer max_excl parent c= hild >> -------- ---- ---- -------- -------- ------ -= ---- >> 0/5 16.00KiB 16.00KiB none none --- -= -- >> 0/256 1.10GiB 100.02MiB none none --- -= -- >> 0/259 1.00GiB 16.00KiB none none --- -= -- >> --- >> >>> 10:/mnt # filefrag -v test/file >>> Filesystem type is: 9123683e >>> File size of test/file is 1073741824 (262144 blocks of 4096 bytes) >=20 > My bad, I'm still using 512 bytes as blocksize. > If using 4K blocksize, then the fiemap result matches. >=20 > Then please discard my previous comment. >=20 > Then we need to check data extents layout to make sure what's going on.= >=20 > Would you please provide the following output? > # btrfs ins dump-tree -t 258 /dev/vdb > # btrfs ins dump-tree -t 263 /dev/vdb > # btrfs check /dev/vdb >=20 > If the last command reports qgroup mismatch, then it means qgroup is > indeed incorrect. >=20 no error reported. 10:/home/bor # btrfs ins dump-tree -t 258 /dev/vdb btrfs-progs v5.1 file tree key (258 ROOT_ITEM 0) leaf 32505856 items 45 free space 12677 generation 11 owner 258 leaf 32505856 flags 0x1(WRITTEN) backref revision 1 fs uuid d10df0fa-25aa-4d80-89d9-16033ae3392d chunk uuid 1bf7922a-9f98-4c76-8511-77e5605b8112 item 0 key (256 INODE_ITEM 0) itemoff 16123 itemsize 160 generation 8 transid 9 size 8 nbytes 0 block group 0 mode 40755 links 1 uid 0 gid 0 rdev 0 sequence 13 flags 0x0(none) atime 1561214496.783636682 (2019-06-22 17:41:36) ctime 1561214504.7643132 (2019-06-22 17:41:44) mtime 1561214504.7643132 (2019-06-22 17:41:44) otime 1561214496.783636682 (2019-06-22 17:41:36) item 1 key (256 INODE_REF 256) itemoff 16111 itemsize 12 index 0 namelen 2 name: .. item 2 key (256 DIR_ITEM 1847562484) itemoff 16077 itemsize 34 location key (257 INODE_ITEM 0) type FILE transid 9 data_len 0 name_len 4 name: file item 3 key (256 DIR_INDEX 2) itemoff 16043 itemsize 34 location key (257 INODE_ITEM 0) type FILE transid 9 data_len 0 name_len 4 name: file item 4 key (257 INODE_ITEM 0) itemoff 15883 itemsize 160 generation 9 transid 11 size 1073741824 nbytes 1073741824 block group 0 mode 100644 links 1 uid 0 gid 0 rdev 0 sequence 1136 flags 0x0(none) atime 1561214504.7643132 (2019-06-22 17:41:44) ctime 1561214563.71728522 (2019-06-22 17:42:43) mtime 1561214563.71728522 (2019-06-22 17:42:43) otime 1561214504.7643132 (2019-06-22 17:41:44) item 5 key (257 INODE_REF 256) itemoff 15869 itemsize 14 index 2 namelen 4 name: file item 6 key (257 EXTENT_DATA 0) itemoff 15816 itemsize 53 generation 11 type 1 (regular) extent data disk byte 1291976704 nr 46137344 extent data offset 0 nr 46137344 ram 46137344 extent compression 0 (none) item 7 key (257 EXTENT_DATA 46137344) itemoff 15763 itemsize 53 generation 11 type 1 (regular) extent data disk byte 1338114048 nr 45875200 extent data offset 0 nr 45875200 ram 45875200 extent compression 0 (none) item 8 key (257 EXTENT_DATA 92012544) itemoff 15710 itemsize 53 generation 11 type 1 (regular) extent data disk byte 314966016 nr 262144 extent data offset 0 nr 262144 ram 262144 extent compression 0 (none) item 9 key (257 EXTENT_DATA 92274688) itemoff 15657 itemsize 53 generation 11 type 1 (regular) extent data disk byte 315228160 nr 12582912 extent data offset 0 nr 12582912 ram 12582912 extent compression 0 (none) item 10 key (257 EXTENT_DATA 104857600) itemoff 15604 itemsize 53 generation 9 type 1 (regular) extent data disk byte 227016704 nr 43515904 extent data offset 15728640 nr 27787264 ram 43515904 extent compression 0 (none) item 11 key (257 EXTENT_DATA 132644864) itemoff 15551 itemsize 53 generation 9 type 1 (regular) extent data disk byte 270532608 nr 524288 extent data offset 0 nr 524288 ram 524288 extent compression 0 (none) item 12 key (257 EXTENT_DATA 133169152) itemoff 15498 itemsize 53 generation 9 type 1 (regular) extent data disk byte 271056896 nr 43515904 extent data offset 0 nr 43515904 ram 43515904 extent compression 0 (none) item 13 key (257 EXTENT_DATA 176685056) itemoff 15445 itemsize 53 generation 9 type 1 (regular) extent data disk byte 352452608 nr 43515904 extent data offset 0 nr 43515904 ram 43515904 extent compression 0 (none) item 14 key (257 EXTENT_DATA 220200960) itemoff 15392 itemsize 53 generation 9 type 1 (regular) extent data disk byte 395968512 nr 43515904 extent data offset 0 nr 43515904 ram 43515904 extent compression 0 (none) item 15 key (257 EXTENT_DATA 263716864) itemoff 15339 itemsize 53 generation 9 type 1 (regular) extent data disk byte 439484416 nr 43778048 extent data offset 0 nr 43778048 ram 43778048 extent compression 0 (none) item 16 key (257 EXTENT_DATA 307494912) itemoff 15286 itemsize 53 generation 9 type 1 (regular) extent data disk byte 483262464 nr 786432 extent data offset 0 nr 786432 ram 786432 extent compression 0 (none) item 17 key (257 EXTENT_DATA 308281344) itemoff 15233 itemsize 53 generation 9 type 1 (regular) extent data disk byte 484048896 nr 43515904 extent data offset 0 nr 43515904 ram 43515904 extent compression 0 (none) item 18 key (257 EXTENT_DATA 351797248) itemoff 15180 itemsize 53 generation 9 type 1 (regular) extent data disk byte 527564800 nr 524288 extent data offset 0 nr 524288 ram 524288 extent compression 0 (none) item 19 key (257 EXTENT_DATA 352321536) itemoff 15127 itemsize 53 generation 9 type 1 (regular) extent data disk byte 528089088 nr 44564480 extent data offset 0 nr 44564480 ram 44564480 extent compression 0 (none) item 20 key (257 EXTENT_DATA 396886016) itemoff 15074 itemsize 53 generation 9 type 1 (regular) extent data disk byte 572653568 nr 1572864 extent data offset 0 nr 1572864 ram 1572864 extent compression 0 (none) item 21 key (257 EXTENT_DATA 398458880) itemoff 15021 itemsize 53 generation 9 type 1 (regular) extent data disk byte 587333632 nr 43515904 extent data offset 0 nr 43515904 ram 43515904 extent compression 0 (none) item 22 key (257 EXTENT_DATA 441974784) itemoff 14968 itemsize 53 generation 9 type 1 (regular) extent data disk byte 630849536 nr 524288 extent data offset 0 nr 524288 ram 524288 extent compression 0 (none) item 23 key (257 EXTENT_DATA 442499072) itemoff 14915 itemsize 53 generation 9 type 1 (regular) extent data disk byte 631373824 nr 44564480 extent data offset 0 nr 44564480 ram 44564480 extent compression 0 (none) item 24 key (257 EXTENT_DATA 487063552) itemoff 14862 itemsize 53 generation 9 type 1 (regular) extent data disk byte 675938304 nr 524288 extent data offset 0 nr 524288 ram 524288 extent compression 0 (none) item 25 key (257 EXTENT_DATA 487587840) itemoff 14809 itemsize 53 generation 9 type 1 (regular) extent data disk byte 676462592 nr 43778048 extent data offset 0 nr 43778048 ram 43778048 extent compression 0 (none) item 26 key (257 EXTENT_DATA 531365888) itemoff 14756 itemsize 53 generation 9 type 1 (regular) extent data disk byte 720240640 nr 262144 extent data offset 0 nr 262144 ram 262144 extent compression 0 (none) item 27 key (257 EXTENT_DATA 531628032) itemoff 14703 itemsize 53 generation 9 type 1 (regular) extent data disk byte 720502784 nr 44040192 extent data offset 0 nr 44040192 ram 44040192 extent compression 0 (none) item 28 key (257 EXTENT_DATA 575668224) itemoff 14650 itemsize 53 generation 9 type 1 (regular) extent data disk byte 764542976 nr 44564480 extent data offset 0 nr 44564480 ram 44564480 extent compression 0 (none) item 29 key (257 EXTENT_DATA 620232704) itemoff 14597 itemsize 53 generation 9 type 1 (regular) extent data disk byte 809107456 nr 524288 extent data offset 0 nr 524288 ram 524288 extent compression 0 (none) item 30 key (257 EXTENT_DATA 620756992) itemoff 14544 itemsize 53 generation 9 type 1 (regular) extent data disk byte 822214656 nr 44302336 extent data offset 0 nr 44302336 ram 44302336 extent compression 0 (none) item 31 key (257 EXTENT_DATA 665059328) itemoff 14491 itemsize 53 generation 9 type 1 (regular) extent data disk byte 866516992 nr 44826624 extent data offset 0 nr 44826624 ram 44826624 extent compression 0 (none) item 32 key (257 EXTENT_DATA 709885952) itemoff 14438 itemsize 53 generation 9 type 1 (regular) extent data disk byte 911343616 nr 1572864 extent data offset 0 nr 1572864 ram 1572864 extent compression 0 (none) item 33 key (257 EXTENT_DATA 711458816) itemoff 14385 itemsize 53 generation 9 type 1 (regular) extent data disk byte 912916480 nr 45088768 extent data offset 0 nr 45088768 ram 45088768 extent compression 0 (none) item 34 key (257 EXTENT_DATA 756547584) itemoff 14332 itemsize 53 generation 9 type 1 (regular) extent data disk byte 958005248 nr 524288 extent data offset 0 nr 524288 ram 524288 extent compression 0 (none) item 35 key (257 EXTENT_DATA 757071872) itemoff 14279 itemsize 53 generation 9 type 1 (regular) extent data disk byte 958529536 nr 44564480 extent data offset 0 nr 44564480 ram 44564480 extent compression 0 (none) item 36 key (257 EXTENT_DATA 801636352) itemoff 14226 itemsize 53 generation 9 type 1 (regular) extent data disk byte 1003094016 nr 1572864 extent data offset 0 nr 1572864 ram 1572864 extent compression 0 (none) item 37 key (257 EXTENT_DATA 803209216) itemoff 14173 itemsize 53 generation 9 type 1 (regular) extent data disk byte 1004666880 nr 45088768 extent data offset 0 nr 45088768 ram 45088768 extent compression 0 (none) item 38 key (257 EXTENT_DATA 848297984) itemoff 14120 itemsize 53 generation 9 type 1 (regular) extent data disk byte 1049755648 nr 1048576 extent data offset 0 nr 1048576 ram 1048576 extent compression 0 (none) item 39 key (257 EXTENT_DATA 849346560) itemoff 14067 itemsize 53 generation 9 type 1 (regular) extent data disk byte 1057095680 nr 45350912 extent data offset 0 nr 45350912 ram 45350912 extent compression 0 (none) item 40 key (257 EXTENT_DATA 894697472) itemoff 14014 itemsize 53 generation 9 type 1 (regular) extent data disk byte 1102446592 nr 44826624 extent data offset 0 nr 44826624 ram 44826624 extent compression 0 (none) item 41 key (257 EXTENT_DATA 939524096) itemoff 13961 itemsize 53 generation 9 type 1 (regular) extent data disk byte 1147273216 nr 45613056 extent data offset 0 nr 45613056 ram 45613056 extent compression 0 (none) item 42 key (257 EXTENT_DATA 985137152) itemoff 13908 itemsize 53 generation 9 type 1 (regular) extent data disk byte 1192886272 nr 524288 extent data offset 0 nr 524288 ram 524288 extent compression 0 (none) item 43 key (257 EXTENT_DATA 985661440) itemoff 13855 itemsize 53 generation 9 type 1 (regular) extent data disk byte 1193410560 nr 45088768 extent data offset 0 nr 45088768 ram 45088768 extent compression 0 (none) item 44 key (257 EXTENT_DATA 1030750208) itemoff 13802 itemsize 53 generation 9 type 1 (regular) extent data disk byte 1238499328 nr 42991616 extent data offset 0 nr 42991616 ram 42991616 extent compression 0 (none) total bytes 2147483648 bytes used 1180483584 uuid d10df0fa-25aa-4d80-89d9-16033ae3392d 10:/home/bor # btrfs ins dump-tree -t 263 /dev/vdb btrfs-progs v5.1 file tree key (263 ROOT_ITEM 10) leaf 32112640 items 45 free space 12677 generation 10 owner 263 leaf 32112640 flags 0x1(WRITTEN) backref revision 1 fs uuid d10df0fa-25aa-4d80-89d9-16033ae3392d chunk uuid 1bf7922a-9f98-4c76-8511-77e5605b8112 item 0 key (256 INODE_ITEM 0) itemoff 16123 itemsize 160 generation 8 transid 9 size 8 nbytes 0 block group 0 mode 40755 links 1 uid 0 gid 0 rdev 0 sequence 13 flags 0x0(none) atime 1561214496.783636682 (2019-06-22 17:41:36) ctime 1561214504.7643132 (2019-06-22 17:41:44) mtime 1561214504.7643132 (2019-06-22 17:41:44) otime 1561214496.783636682 (2019-06-22 17:41:36) item 1 key (256 INODE_REF 256) itemoff 16111 itemsize 12 index 0 namelen 2 name: .. item 2 key (256 DIR_ITEM 1847562484) itemoff 16077 itemsize 34 location key (257 INODE_ITEM 0) type FILE transid 9 data_len 0 name_len 4 name: file item 3 key (256 DIR_INDEX 2) itemoff 16043 itemsize 34 location key (257 INODE_ITEM 0) type FILE transid 9 data_len 0 name_len 4 name: file item 4 key (257 INODE_ITEM 0) itemoff 15883 itemsize 160 generation 9 transid 9 size 1073741824 nbytes 1073741824 block group 0 mode 100644 links 1 uid 0 gid 0 rdev 0 sequence 1036 flags 0x0(none) atime 1561214504.7643132 (2019-06-22 17:41:44) ctime 1561214510.719648638 (2019-06-22 17:41:50) mtime 1561214510.719648638 (2019-06-22 17:41:50) otime 1561214504.7643132 (2019-06-22 17:41:44) item 5 key (257 INODE_REF 256) itemoff 15869 itemsize 14 index 2 namelen 4 name: file item 6 key (257 EXTENT_DATA 0) itemoff 15816 itemsize 53 generation 9 type 1 (regular) extent data disk byte 137887744 nr 43778048 extent data offset 0 nr 43778048 ram 43778048 extent compression 0 (none) item 7 key (257 EXTENT_DATA 43778048) itemoff 15763 itemsize 53 generation 9 type 1 (regular) extent data disk byte 181665792 nr 1310720 extent data offset 0 nr 1310720 ram 1310720 extent compression 0 (none) item 8 key (257 EXTENT_DATA 45088768) itemoff 15710 itemsize 53 generation 9 type 1 (regular) extent data disk byte 182976512 nr 43778048 extent data offset 0 nr 43778048 ram 43778048 extent compression 0 (none) item 9 key (257 EXTENT_DATA 88866816) itemoff 15657 itemsize 53 generation 9 type 1 (regular) extent data disk byte 226754560 nr 262144 extent data offset 0 nr 262144 ram 262144 extent compression 0 (none) item 10 key (257 EXTENT_DATA 89128960) itemoff 15604 itemsize 53 generation 9 type 1 (regular) extent data disk byte 227016704 nr 43515904 extent data offset 0 nr 43515904 ram 43515904 extent compression 0 (none) 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itemsize 53 generation 9 type 1 (regular) extent data disk byte 1057095680 nr 45350912 extent data offset 0 nr 45350912 ram 45350912 extent compression 0 (none) item 40 key (257 EXTENT_DATA 894697472) itemoff 14014 itemsize 53 generation 9 type 1 (regular) extent data disk byte 1102446592 nr 44826624 extent data offset 0 nr 44826624 ram 44826624 extent compression 0 (none) item 41 key (257 EXTENT_DATA 939524096) itemoff 13961 itemsize 53 generation 9 type 1 (regular) extent data disk byte 1147273216 nr 45613056 extent data offset 0 nr 45613056 ram 45613056 extent compression 0 (none) item 42 key (257 EXTENT_DATA 985137152) itemoff 13908 itemsize 53 generation 9 type 1 (regular) extent data disk byte 1192886272 nr 524288 extent data offset 0 nr 524288 ram 524288 extent compression 0 (none) item 43 key (257 EXTENT_DATA 985661440) itemoff 13855 itemsize 53 generation 9 type 1 (regular) extent data disk byte 1193410560 nr 45088768 extent data offset 0 nr 45088768 ram 45088768 extent compression 0 (none) item 44 key (257 EXTENT_DATA 1030750208) itemoff 13802 itemsize 53 generation 9 type 1 (regular) extent data disk byte 1238499328 nr 42991616 extent data offset 0 nr 42991616 ram 42991616 extent compression 0 (none) total bytes 2147483648 bytes used 1180483584 uuid d10df0fa-25aa-4d80-89d9-16033ae3392d 10:/home/bor # btrfs check /dev/vdb Opening filesystem to check... Checking filesystem on /dev/vdb UUID: d10df0fa-25aa-4d80-89d9-16033ae3392d [1/7] checking root items [2/7] checking extents [3/7] checking free space cache [4/7] checking fs roots [5/7] checking only csums items (without verifying data) [6/7] checking root refs [7/7] checking quota groups found 1180483584 bytes used, no error found total csum bytes: 1150976 total tree bytes: 1425408 total fs tree bytes: 65536 total extent tree bytes: 16384 btree space waste bytes: 231695 file data blocks allocated: 2163671040 referenced 2147942400 10:/home/bor # > Also, I see your subvolume id is not continuous, did you created/remove= d > some other subvolumes during your test? >=20 No. At least on this filesystem. I have recreated it several times, but since the last mkfs these were the only two subvolumes I created myself. > Thanks, > Qu >=20 >>> Oops. Where 85MiB exclusive usage in snapshot comes from? I would exp= ect >>> one of >>> >>> - 0 exclusive, because original first extent is still referenced by t= est >>> (even though partially), so if qgroup counts physical space usage, sn= ap1 >>> effectively refers to the same physical extents as test. >>> >>> - 100MiB exclusive if qgroup counts logical space consumption, becaus= e >>> snapshot now has 100MiB different data. >>> >>> But 85MiB? It does not match any observed value. Judging by 1.01GiB o= f >>> referenced space for subvolume test, qrgoup counts physical usage, at= Actually 100MiB is 0.1GiB, not 0.01GiB, so this conclusion is wrong. At which point I'm even more confused what qgroup really counts :) >>> which point snapshot exclusive space consumption remains 0. >>> >> >=20 --1nB6cPI4iluQoGJsWvOyBnzAxG5RERR2N-- --P22tfS6FffGE7tNgX9vYphpputak2Si7Q Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iF0EARECAB0WIQTsPDUXSW5c6iqbJulHosy62l33jAUCXQ9RLAAKCRBHosy62l33 jFkVAKCb17ZUpyFbstakTktrqB8AmyhvKQCgsQ9puoOuBGuJrwK2vK6MP+56/oE= =4idP -----END PGP SIGNATURE----- --P22tfS6FffGE7tNgX9vYphpputak2Si7Q--