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* src/du.c (process_file): Avoid recalculation of hashes and of file-exclusion for directories. Do not descend into the same directory more than once, unless -l is given; this is faster. Calculate stat buffer lazily, since it need not be computed at all for excluded files. Count space if FTS_ERR, since stat buffer is always valid then. No need for 'print' local variable. (main): Use FTS_NOSTAT. Use FTS_TIGHT_CYCLE_CHECK only when not hashing everything, since process_file finds cycles on its own when hashing everything. * tests/du/deref: Add test cases for -L bugs.