TODO
auth:
	Require auth for writing, and
	allow writes to only one file
	per user
uid:
	Manage users to enforce unique
	uids (new datastructure required)

解ります All aux related operations require
walk, so make aux on attach, then copy
on clone, and free on clunk;
	attach
		walk&clone
		(
			open
			..op..
		)