mountd
^^^^^^

See man rpc.mountd for basic info.

work of MNT done by utils/mountd/mountd.c:get_rootfh():
	first calls utils/mountd/auth.c:auth_reload():
		first frees everything with export_freeall.  Then
		xtab_read(_PATH_ETAB): read /var/lib/nfs/etab, the list of
			current exports, using:
				getexportent: fill in a struct exportent, which
					includes hostname, path, etc.
				export_lookup: takes exportent, looks up struct
					nfs_export, which is an exportent plus
					a pointer to a struct mclient (which
					includes type, addresses, etc.)
				export_create: creates exportent
				both export_lookup and _create do a
					client_lookup, which creates a new
					client if required and does all the
					name lookups and such.
	Then do utils/mountd/auth.c:auth_authenticate():
		does auth_authenticate_internal() on the path, then on the
		path minus the last component, etc., till it finds an export.
		auth_authenticate_internal():
			does DNS stuff, then export_find, which does for each
			export an export_check, which compares path and does
			client_check(), which is what does wildcard matching
			and all the rest.
	stat path, make sure it's a directory or regular file.
	export_export(): does the actual nfsctls as necessary.
	xtab_append(): appends entry to xtab file.  (What's that for?)
	getfh_size(): does an nfsctl to get the filehandle.
	mountlist_add(): adds to rmtab.
	export_reset(): don't understand this.