>> yeah, but doing a full tree walk under the covers in that first readdir
 >> will Suck.  I'd rather the view creation be a bit slowerer in order that
 >> the first access to the view would be responsive.
 >
 >Pick your poison.  O(N) creation or O(N) initial traversal.

the low-hanging fruit is a "view" as a window onto a static snapshot.

why not just create the view instantly and then filter all operations
which scan a directory from that point onwards, try growing it
incrementally upon demand?

        -a
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