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Description of problem:
Raw disk can not be added again with error "unsupported configuration: shared access for disk 'vdb' requires use of supported storage format"

Version-Release number of selected component (if applicable):
cockpit-machines-210-1.el8.noarch
libvirt-dbus-1.2.0-3.module+el8.1.0+4066+0f1aadab.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Prepare an off VM
2. Enter Disk tab, click Add Disk
  Source:Create New
  Pool:images
  Name:test1
  Size:1
  Format:raw
  Cache:default
  Bus:virtio
Click Add
3. Click Remove to detach the disk
4. Click Add Disk
  Source:Use Existing
  Volume:test1 (The one you created in step2)


Actual results:
Raw disk can not be added again with error "unsupported configuration: shared access for disk 'vdb' requires use of supported storage format"

Expected results:
The existing raw disk can be added correctly

Additional info:
This only happens when there is only 2 disks in the pool.

PR fix:
https://github.com/cockpit-project/cockpit/pull/13437

Verified with package:
cockpit-machines-211.2-1.el8.noarch

Steps:
1. Prepare an off VM
2. Enter Disk tab, click Add Disk
  Source:Create New
  Pool:images
  Name:test1
  Size:1
  Format:raw
  Cache:default
  Bus:virtio
Click Add
3. Click Remove to detach the disk
4. Click Add Disk
  Source:Use Existing
  Volume:test1 (The one you created in step2)

The existing raw disk can be added correctly.
So verified.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:1639