Merge PR #30972 into master

Merge PR #30972 into master

* refs/pull/30972/head:
	mds: move 'traverse to auth' logic into MDCache::path_traverse
	mds: cleanup Capability initialization
	mds: cleanup code that kills session requests
	mds: cleanup Server::try_open_auth_dirfrag()
	mds: restrict path that walks into snapdir
	mds: use single map to track pinned & auth_pinned objects
	mds: define operator<(...) for MutationImpl::LockOp
	mds: cleanup Locker::acquire_locks()
	mds: introduce Locker::wrlock_try()
	mds: explictly specify if MDCache::path_traverse() needs to check null dentry
	mds: cleanup dentry non-readable check in MDCache::path_traverse()
	mds: change MDCache::path_traverse()'s 'onfail' argument to flags

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