Description of problem:

Inside a VM, mount a filesystem multiple times:

# mount | grep vda3
/dev/vda3 on / type xfs (rw,relatime,seclabel,attr2,inode64,logbufs=8,logbsize=32k,noquota)
/dev/vda3 on /mnt type xfs (rw,relatime,seclabel,attr2,inode64,logbufs=8,logbsize=32k,noquota)

Notice this is a 100G disk.

# lsblk
NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
vda    252:0    0  100G  0 disk 
├─vda1 252:1    0    1M  0 part 
├─vda2 252:2    0  100M  0 part /boot/efi
└─vda3 252:3    0 99.9G  0 part /mnt
vdb    252:16   0    1M  0 disk 

Now open the console and go to
Virtualization -> Virtual Machines -> xyz -> Overview -> Utilization -> Storage

Wait about 5 minutes

You will see X used out of 200G, its counting vda3 twice due to the multiple mounts of the filesystem.

That is incorrect. The VM has a 100G disk and it should not sum all the available and used spaces for all mountpoints.

Version-Release number of selected component (if applicable):
OCP 4.12.6
CNV 4.12.1

How reproducible:
Always

Steps to Reproduce:
1. Mount the same filesystem twice or more, to different mountpoints
2. Go to Utilization -> Storage

Actual results:
* Incorrect data reported

Expected results:
* Correct utilization reported

Additional info:
* This breaks reporting for Hypershift NodePool VMs, where the filesystems are mounted many times over.