device: 0.839
graphic: 0.676
vnc: 0.599
PID: 0.491
permissions: 0.474
network: 0.413
semantic: 0.409
boot: 0.357
debug: 0.339
performance: 0.324
socket: 0.260
files: 0.247
KVM: 0.070
other: 0.021

shrink attached rbd size is not allowed by default
Description of problem:

Steps to reproduce:
1. attach a disk with size 100GiB to a running vm
2. writing some data to the attached disk
3. executing block_resize command and shrink the size to 1GiB

the result is virtual disk is resized successfully and causing data lost.
Additional information:
Tested QEMU version is 4.2