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Description of problem:
The size of the storage volume should not exceed the size of the storage pool

Version-Release number of selected component (if applicable):
cockpit-machines-206-1.el8.noarch
libvirt-dbus-1.2.0-3.module+el8.1.0+4066+0f1aadab.x86_64

How reproducible:
100%

Steps to Reproduce:
1.Prepare a Dir storage pool
2.Click "Storage Pools", unfold the new created storage pool and enter the "Storage Volumes" tab, then click "Create Volume"
3.Enter a size which exceed the size of the storage pool , click create

Actual results:
The disk can be created successfully.

Expected results:
The disk should not be created successfully if the size exceed the size of storage pool.It's better to have a message showing user the max size.  

Additional info:
Please refer to https://github.com/cockpit-project/cockpit/issues/13120 for more info.

PR posted upstream: https://github.com/cockpit-project/cockpit/pull/14946

Verified with package:
cockpit-machines-235-1.el8.noarch
libvirt-dbus-1.3.0-2.module+el8.3.0+6423+e4cb6418.x86_64

Verify steps:
1.Prepare a Dir storage pool
2.Click "Storage Pools", unfold the new created storage pool and enter the "Storage Volumes" tab, then click "Create Volume"
3.Enter a size which exceed the size of the storage pool , click create

There will be a warning like:
Storage volume size must not exceed the storage pool's capacity ($size of the pool)

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 (cockpit-appstream bug fix and enhancement update), 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-2021:1875