The super_set_uuid() function was stubbed as a no-op, causing the
filesystem UUID to display as all zeros during mount. Implement it
to copy the UUID from the ext4 superblock to the VFS super_block
structure.
Before: mounted filesystem 00000000-0000-0000-0000-000000000000 r/w
After: mounted filesystem d4ddb235-df85-4963-a923-7cddc5ad9355 r/w
Add a way to read from tests as well.
Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
b0caf2015b