Merge pull request #10104 from xiaoxichen/wip-16560-jewel

jewel: mds: enforce a dirfrag limit on entries

Reviewed-by: Patrick Donnelly <pdonnell@redhat.com>

diff --cc src/common/config_opts.h
Simple merge

diff --cc src/mds/MDCache.cc
Simple merge

diff --cc src/mds/MDCache.h
Simple merge

diff --cc src/mds/Server.cc
Simple merge