Compression on Btrfs

[Patrick O'Callaghan]

I did the following:

# btrfs filesystem defragment -czstd -r -v /home

and changed the fstab entry:

# grep /home /etc/fstab
UUID=8e1f7af4-c0bf-434e-b1c4-a9af2c810d56 /home                   btrfs  
subvol=home,discard=async,compress-force=zstd     0 0

(this is an SSD, hence the discard-async)

I then rebooted, but find:

# btrfs prop get -t i /home compression
#
(i.e. no output)

and the space usage doesn't seem to have changed.

Is there something I've misunderstood?

poc