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acdc74dbf5
Before, it processed O(n^2) directory name components via stat and mkdir. Now it's O(n). This makes mkdir -p a lot more efficient when creating directories with very many components. On a Linux 2.0.30 ext2fs filesystem this command: mkdir -p `perl -e 'print "a/" x 500'` now runs in 0.77 seconds (user+sys). Contrast that with the 9.5(!) seconds it took before.