devices with the db_persist property won't be deleted during database cleanup. This applies to dm and md devices in particular. For such devices, we should also keep the files under /run/udev/links, /run/udev/tags, and /run/udev/watch, to make sure that after restart, udevd has the same information about the devices as it did before the cleanup. If we don't do this, a lower-priority device that is discovered in the coldplug phase may take over symlinks from a device that persisted. Not removing the watches also enables udevd to resume watching a device after restart. Signed-off-by: Martin Wilck <mwilck@suse.com>
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