devfs_allocp
struct devfs_node *devfs_allocp(devfs_nodetype, char *, struct devfs_node *,
linknode = devfs_allocp(Nlink, name, parent, mp, NULL);
found = devfs_allocp(Ndir, dir_name, parent, parent->mp, NULL);
node = devfs_allocp(Ndev, name, parent, parent->mp, dev);
node = devfs_allocp(devfsnodetype, name, parent, mp, dev);
mnt->root_node = devfs_allocp(Nroot, "", NULL, mp, NULL);