23.06.2019 11:08, Qu Wenruo пишет: > > > On 2019/6/23 下午3:55, Qu Wenruo wrote: >> >> >> On 2019/6/22 下午11:11, Andrei Borzenkov wrote: >> [snip] >>> >>> 10:/mnt # dd if=/dev/urandom of=test/file bs=1M count=100 seek=0 >>> conv=notrunc >>> 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="/dev/data/btrfs" >> mnt="/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 child >> -------- ---- ---- -------- -------- ------ ----- >> 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 child >> -------- ---- ---- -------- -------- ------ ----- >> 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) > > My bad, I'm still using 512 bytes as blocksize. > If using 4K blocksize, then the fiemap result matches. > > Then please discard my previous comment. > > Then we need to check data extents layout to make sure what's going on. > > 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 > > If the last command reports qgroup mismatch, then it means qgroup is > indeed incorrect. >
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)
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 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/removed
> some other subvolumes during your test?
>
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
>
>>> Oops. Where 85MiB exclusive usage in snapshot comes from? I would expect
>>> one of
>>>
>>> - 0 exclusive, because original first extent is still referenced by test
>>> (even though partially), so if qgroup counts physical space usage, snap1
>>> effectively refers to the same physical extents as test.
>>>
>>> - 100MiB exclusive if qgroup counts logical space consumption, because
>>> snapshot now has 100MiB different data.
>>>
>>> But 85MiB? It does not match any observed value. Judging by 1.01GiB of
>>> 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.
>>>
>>
>
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