static int pick_link(struct nameidata *nd, struct path *link,
		     struct inode *inode, unsigned seq)
{
	int error;
	struct saved *last;
	if (unlikely(nd->total_link_count++ >= MAXSYMLINKS)) {
		path_to_nameidata(link, nd);
		return -ELOOP;
	}
	if (!(nd->flags & LOOKUP_RCU)) {
		if (link->mnt == nd->path.mnt)
			mntget(link->mnt);
	}
	error = nd_alloc_stack(nd);
	if (unlikely(error)) {
		if (error == -ECHILD) {
			if (unlikely(unlazy_link(nd, link, seq)))
				return -ECHILD;
			error = nd_alloc_stack(nd);
		}
		if (error) {
			path_put(link);
			return error;
		}
	}

	last = nd->stack + nd->depth++;
	last->link = *link;
	last->cookie = NULL;
	last->inode = inode;
	last->seq = seq;
	return 1;
}
static int pick_link(struct nameidata *nd, struct path *link,
		     struct inode *inode, unsigned seq)
{
	int error;
	struct saved *last;
	if (unlikely(nd->total_link_count++ >= MAXSYMLINKS)) {
		path_to_nameidata(link, nd);
		return -ELOOP;
	}
	if (!(nd->flags & LOOKUP_RCU)) {
		if (link->mnt == nd->path.mnt)
			mntget(link->mnt);
	}
	error = nd_alloc_stack(nd);
	if (unlikely(error)) {
		if (error == -ECHILD) {
			if (unlikely(unlazy_link(nd, link, seq)))
				return -ECHILD;
			error = nd_alloc_stack(nd);
		}
		if (error) {
			path_put(link);
			return error;
		}
	}

	last = nd->stack + nd->depth++;
	last->link = *link;
	last->cookie = NULL;
	last->inode = inode;
	last->seq = seq;
	return 1;
}