Describe the bug
When trying to create a snapshot with exact bytes specified, it fails with error
rpc error: code = OutOfRange desc = requested size 1136238592 is smaller than source logical volume: 1136656384 during this check. Probably this is happens because of LVM which rounds up the storage, because i see the following message in the logs
Rounding up size to full physical extent <1.06 GiB

To Reproduce
Steps to reproduce the behavior:

1. Create PVC

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: simple-pvc
spec:
  volumeMode: Filesystem
  storageClassName: topolvm-provisioner
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1136234735

2. Create pod

apiVersion: v1
kind: Pod
...
  volumes:
  - name: mypvc
    persistentVolumeClaim:
      claimName: simple-pvc

3. Create Snapshot

apiVersion: snapshot.storage.k8s.io/v1
kind: VolumeSnapshot
metadata:
  name: simple-snap
spec:
  volumeSnapshotClassName: topolvm-provisioner
  source:
    persistentVolumeClaimName: simple-pvc

Expected behavior
Snapshot succeed

Additional context
When creating PVC with size 1136234735, LV gets created with size 1136656384, probably because of LVM rounding