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Need btrfs every day

In paste I have trouble withe full disk and not working btrfs. After full reset, now I installed "BTRFS balance checker" from OpenRepos.net and I get permanently alert about less diskspace.

Input in my terminal shows:

[root@Jolla nemo]# btrfs fi show
ERROR: unable get label Inappropriate ioctl for device
Label: 'sailfish'  uuid: 04ae1499-2c1e-4541-a9df-159a1480c3b0
    Total devices 1 FS bytes used 9.71GiB
    devid    1 size 13.75GiB used 13.44GiB path /dev/mmcblk0p28

Btrfs v3.16

Then I tried:

[root@Jolla nemo]# btrfs balance start -dusage=5 /
Done, had to relocate 3 out of 18 chunks

The disk is now free:

[root@Jolla nemo]# btrfs fi show
ERROR: unable get label Inappropriate ioctl for device
Label: 'sailfish'  uuid: 04ae1499-2c1e-4541-a9df-159a1480c3b0
    Total devices 1 FS bytes used 9.71GiB
    devid    1 size 13.75GiB used 10.94GiB path /dev/mmcblk0p28

Btrfs v3.16

Why get my disk permanently full? Is there a spcript in cronjob working every day?

Thanks