How to reduce storage in zpool by the size of the unallocated area?

Question

linux

A small introduction. There was a Hyper-V container 500Gb, using the qm utility in proxmox 5.2, I converted it to a disk in the ZFS pool. In fact, the container uses 200Gb, with the help of gparted I reduced the size to 250Gb. But the disk itself remains 500Gb of course. How can I shrink this drive by the size of the unallocated area?

[email protected]:~# zfs list -t all -r raid
NAME                     USED  AVAIL  REFER  MOUNTPOINT
raid                    1.49T  87.4G   492G  /raid
raid/subvol-140-disk-1  1.36G  18.6G  1.36G  /raid/subvol-140-disk-1
raid/vm-120-disk-2       516G   106G   497G  -
raid/vm-121-disk-1       206G   290G  3.69G  -
raid/vm-139-disk-1       309G   250G   147G  -

Answer 1

I'll answer myself. Because this is volume type

[email protected]:~# zfs get type raid/vm-120-disk-2
NAME                PROPERTY  VALUE   SOURCE
raid/vm-120-disk-2  type      volume  -

Then zfs set quota will not work, but will work

[email protected]:~# zfs get volsize raid/vm-120-disk-2
NAME                PROPERTY  VALUE    SOURCE
raid/vm-120-disk-2  volsize   500G     local

We look at the size of the unallocated area, subtract from 500 and execute
Where 267 is the final disk size