BTRFS resize - free space not available to use

Question

I'm trying to shrink BTRFS partition and create new EXT4 partition with that free space.

I did btrfs filesystem resize -5g /

Now I have this (notice Device slack equals what I shrinked):

orangepiplus2e:~:# btrfs device usage /
/dev/mmcblk2p2, ID: 1
   Device size:            14.15GiB
   Device slack:            5.00GiB
   Data,single:             7.66GiB
   Metadata,single:       768.00MiB
   System,single:          32.00MiB
   Unallocated:           725.00MiB

How can I free that 5 GB of Device slack to use? Google didn't help me out.

btrfs only resizes the file system, not the partition. You need to resize the partition as well. — Gerald Schneider, Jan 07 '22 at 09:23
Please don't edit your solution into the question, post it as an answer instead and accept it when you can. — Gerald Schneider, Jan 07 '22 at 09:44

score 0 · Accepted Answer · answered Jan 18 '22 at 08:13

0

@Gerald Schneider is right. I had to resize partition too. Thank you!

parted /dev/mmcblk2
(parted) resizepart
Partition number? 2
End?  [15.5GB]? 9.9GB

answered Jan 18 '22 at 08:13

PetrK

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BTRFS resize - free space not available to use

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