This is what an entry in dir_info looks like:
w/grendel:grendel:senior:1:1

What it means:
w/grendel - the path
grendel - the owner, the owner can read and write to this dir
senior - the group, members of this group can read and write to this dir
1 - default read, if this is one , anyone can read this dir
	if 0, only the owner and group can read it
1 - setuid, if this is 1 an object in this dir can call seteuid(<owner>)
	if 0, it can't