My root partition uses btrfs (btrfs tools 3.17) on my debian 8 server.
When I check free space available with df, it says 39 G used
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root@dc-doli-sf:~# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 48G 39G 7.4G 85% /
udev 10M 0 10M 0% /dev
tmpfs 794M 17M 777M 3% /run
tmpfs 2.0G 0 2.0G 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 2.0G 0 2.0G 0% /sys/fs/cgroup
/dev/sda1 472M 33M 415M 8% /boot
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root@dc-doli-sf:/# du -shx
9.8G .
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root@dc-doli-sf:/# btrfs fi show
Label: 'root' uuid: 2d0f1565-0d03-4e3c-b0f6-bb6a42636b72
Total devices 1 FS bytes used 38.66GiB
devid 1 size 47.80GiB used 43.04GiB path /dev/sda3
Btrfs v3.17
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root@dc-doli-sf:/# btrfs filesystem df /
Data, single: total=41.01GiB, used=38.42GiB
System, DUP: total=8.00MiB, used=16.00KiB
System, single: total=4.00MiB, used=0.00B
Metadata, DUP: total=1.00GiB, used=246.77MiB
Metadata, single: total=8.00MiB, used=0.00B
GlobalReserve, single: total=96.00MiB, used=0.00B
Thanks in advanced !
TwiX