Fix the broken cache more.
Take a look at the nano second in the mtime to figure out if the cache needs to be updated if available. and do the mutex lock between scanning and writing a cache to avoid the conflict. Also we don't need to scan directories again after writing caches. so getting rid of the related code as well. https://bugs.freedesktop.org/show_bug.cgi?id=69845 and for reference: https://bugzilla.redhat.com/show_bug.cgi?id=1236034
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