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cache: add empty path support

Description

cache: add empty path support

This avoids spurious drop offs as EMPTY is passed regardless of the
actual path name.

Pushign the work inside the lookup instead of just ignorign the flag
allows avoid checking for empty pathname for all other lookups.

(cherry picked from commit 7dd419cabc6bb9e019c56d15f8e6a88ee2f46859)

Details

Provenance
mjgAuthored on Sep 26 2021, 1:00 PM
Parents
rGf85d71e72e1f: cache: retire cache_fast_revlookup sysctl
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