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The task queue can become very large with many subvols, requiring hours for the queue to clear. 'beescrawl.dat' saves in the meantime will save the work currently scheduled, not the work currently completed. Fix by tracking progress with ProgressTracker. ProgressTracker::begin() gives the last completed crawl position. ProgressTracker::end() gives the last scheduled crawl position. begin() does not advance if there is any item between begin() and end() is not yet completed. In between are crawled extents that are on the task queue but not yet processed. The file 'beescrawl.dat' saves the begin() position while the extent scanning task queue is fed from the end() position. Also remove an unused method crawl_state_get() and repurpose the operator<(BeesCrawlState) that nobody was using. Signed-off-by: Zygo Blaxell <bees@furryterror.org>