resize btrfs partition

 sudo mount /dev/nvme0n1p2 /mnt/

 

>sudo btrfs filesystem show /mnt/
Label: none  uuid: e44f93c0-503f-461d-8cea-f716fa5ec102
    Total devices 1 FS bytes used 564.02MiB

sudo btrfs filesystem resize -20G /mnt/

 

sudo umount /mnt 

 

sudo cfdisk /dev/nvme0n1

resize and make new partition size orig-20G

 

sudo btrfs filesystem usage /mnt
Overall:
    Device size:         22.41GiB
    Device allocated:          4.52GiB
    Device unallocated:         17.89GiB
    Device missing:            0.00B
    Device slack:         88.00MiB
    Used:            593.24MiB
    Free (estimated):         20.38GiB    (min: 11.43GiB)
    Free (statfs, df):         20.38GiB
    Data ratio:                 1.00
    Metadata ratio:             2.00
    Global reserve:          5.50MiB    (used: 0.00B)
    Multiple profiles:               no

Data,single: Size:3.01GiB, Used:534.80MiB (17.36%)
   /dev/nvme0n1p2      3.01GiB

Metadata,DUP: Size:768.00MiB, Used:29.20MiB (3.80%)
   /dev/nvme0n1p2      1.50GiB

System,DUP: Size:8.00MiB, Used:16.00KiB (0.20%)
   /dev/nvme0n1p2     16.00MiB

Unallocated:
   /dev/nvme0n1p2     17.89GiB

 

sudo btrfs filesystem resize -10G /mnt/
Resize device id 1 (/dev/nvme0n1p2) from 22.41GiB to 12.41GiB

sudo umount /mnt 

sudo cfdisk /dev/nvme0n1 

resize to    12.41G