When restoring a filesystem volume snapshot into a new larger volume, the filesystem of that new volume doesn't reflect the new size. It will show the size of the original volume that was snapshotted.

4.16    

100%    

    1. Create a filesystem PVC of size 1Gi
    2. Create a volume snapshot of that PVC
    3. Create a new filesystem PVC of size 2Gi with a dataSourceRef of the volume snapshot.
    4. Inspect the size of the filesystem in the new PVC, and notice it is the same as the original size, instead of the new size.
    

filesystem reports the size of the original volume    

filesystem reports the size of the new larger volume