Kernel 5.4 - BTRFS FS shows full with about 600 GB Free ?

Swâmi Petaramesh
2019-12-21T10:59:55Z

Hi list,

After writing files and snapshots WITHOUT errors on an external BTRFS FS
with 500+ GB of free space, using kernel 5.4.5-arch1-1, I dismount the
FS then remount it normally, and then it says the FS has 0 space free left !

Checking the disk on another machine with

[moksha ~]# uname -r
5.4.2-1-MANJARO

And... How can this be ?

root@moksha:~# df -h /run/media/myself/MyVolume
Filesystem           Size  Used Avail Use% Mounted on
/dev/mapper/luks-xxxxxxxxx-yyyy-zzzz-tttt-wwwwwww   1,9T 1,2T     0 100%
/run/media/myself/MyVolume

root@moksha:~# btrfs fi sh
Label: 'MyVolume'  uuid: xxxxxxxxx-yyyy-zzzz-tttt-wwwwwww
Total devices 1 FS bytes used 1.19TiB
devid    1 size 1.82TiB used 1.20TiB path
/dev/mapper/luks-xxxxxxxxx-yyyy-zzzz-tttt-wwwwwww

root@moksha:~# btrfs fi df /run/media/myself/MyVolume
Data, single: total=1.18TiB, used=1.18TiB
System, DUP: total=8.00MiB, used=160.00KiB
Metadata, DUP: total=7.00GiB, used=6.88GiB
GlobalReserve, single: total=512.00MiB, used=0.00B

root@moksha:~# umount /run/media/myself/MyVolume

root@moksha:~# btrfs check /dev/mapper/luks-xxxxxxxxx-yyyy-zzzz-tttt-wwwwwww
Opening filesystem to check...
Checking filesystem on /dev/mapper/luks-xxxxxxxxx-yyyy-zzzz-tttt-wwwwwww
UUID: xxxxxxxxx-yyyy-zzzz-tttt-wwwwwww
[1/7] checking root items
[2/7] checking extents
[3/7] checking free space cache
[4/7] checking fs roots

(Still running since a while, no errors...)

TIA for any help.

Kind regards.