Merge PR #20527 into luminous

* refs/pull/20527/head:
	mds: various fixes for backport
	mds: convert to boost::string_view
	test/encoding: refactor to avoid escaping shell magic
	mds: minor refactor of SimpleLock
	mds: track Capability in mempool
	mds: move CInode container members to mempool
	mds: move CDentry container members to mempool
	mds: move CDir container members to mempool
	mds: put MDSCacheObject compact_map in mempool
	common: use size_t for object size
	mds: convert to allocator agnostic string_view
	mds: simplify initialization
	compact_*: support mempool allocated containers

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

diff --cc qa/standalone/ceph-helpers.sh
Simple merge

diff --cc src/client/Client.cc
Simple merge

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

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

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

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

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

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

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

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

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

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

diff --cc src/tools/cephfs/JournalTool.cc
Simple merge