post output of btrfs fi show
[root@Jolla nemo]# btrfs fi show ERROR: unable get label Inappropriate ioctl for device Label: 'sailfish' uuid: 454d7fe1-b14b-4b0c-b233-3743a93c4c2d Total devices 1 FS bytes used 4.08GiB devid 1 size 13.75GiB used 7.75GiB path /dev/mmcblk0p28 Btrfs v3.16 [root@Jolla nemo]#