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Before, we used to display "Can't remove open logical volume" which was generic. There 3 possibilities of how a device could be opened: - used by another device - having a filesystem on that device which is mounted - opened directly by an application With the help of sysfs info, we can distinguish the first two situations. The third one will be subject to "remove retry" logic - if it's opened quickly (e.g. a parallel scan from within a udev rule run), this will finish quickly and we can remove it once it has finished. If it's a legitimate application that keeps the device opened, we'll do our best to remove the device, but we will fail finally after a few retries.