int fuse_reverse_inval_entry(struct fuse_conn *fc, u64 parent_nodeid,
			     u64 child_nodeid, struct qstr *name)
{
	int err = -ENOTDIR;
	struct inode *parent;
	struct dentry *dir;
	struct dentry *entry;

	parent = fuse_ilookup(fc, parent_nodeid, NULL);
	if (!parent)
		return -ENOENT;

	inode_lock(parent);
	if (!S_ISDIR(parent->i_mode))
		goto unlock;

	err = -ENOENT;
	dir = d_find_alias(parent);
	if (!dir)
		goto unlock;

	name->hash = full_name_hash(dir, name->name, name->len);
	entry = d_lookup(dir, name);
	dput(dir);
	if (!entry)
		goto unlock;

	fuse_dir_changed(parent);
	fuse_invalidate_entry(entry);

	if (child_nodeid != 0 && d_really_is_positive(entry)) {
		inode_lock(d_inode(entry));
		if (get_node_id(d_inode(entry)) != child_nodeid) {
			err = -ENOENT;
			goto badentry;
		}
		if (d_mountpoint(entry)) {
			err = -EBUSY;
			goto badentry;
		}
		if (d_is_dir(entry)) {
			shrink_dcache_parent(entry);
			if (!simple_empty(entry)) {
				err = -ENOTEMPTY;
				goto badentry;
			}
			d_inode(entry)->i_flags |= S_DEAD;
		}
		dont_mount(entry);
		clear_nlink(d_inode(entry));
		err = 0;
 badentry:
		inode_unlock(d_inode(entry));
		if (!err)
			d_delete(entry);
	} else {
		err = 0;
	}
	dput(entry);

 unlock:
	inode_unlock(parent);
	iput(parent);
	return err;
}
int fuse_reverse_inval_entry(struct fuse_conn *fc, u64 parent_nodeid,
			     u64 child_nodeid, struct qstr *name)
{
	int err = -ENOTDIR;
	struct inode *parent;
	struct dentry *dir;
	struct dentry *entry;

	parent = fuse_ilookup(fc, parent_nodeid, NULL);
	if (!parent)
		return -ENOENT;

	inode_lock(parent);
	if (!S_ISDIR(parent->i_mode))
		goto unlock;

	err = -ENOENT;
	dir = d_find_alias(parent);
	if (!dir)
		goto unlock;

	name->hash = full_name_hash(dir, name->name, name->len);
	entry = d_lookup(dir, name);
	dput(dir);
	if (!entry)
		goto unlock;

	fuse_dir_changed(parent);
	fuse_invalidate_entry(entry);

	if (child_nodeid != 0 && d_really_is_positive(entry)) {
		inode_lock(d_inode(entry));
		if (get_node_id(d_inode(entry)) != child_nodeid) {
			err = -ENOENT;
			goto badentry;
		}
		if (d_mountpoint(entry)) {
			err = -EBUSY;
			goto badentry;
		}
		if (d_is_dir(entry)) {
			shrink_dcache_parent(entry);
			if (!simple_empty(entry)) {
				err = -ENOTEMPTY;
				goto badentry;
			}
			d_inode(entry)->i_flags |= S_DEAD;
		}
		dont_mount(entry);
		clear_nlink(d_inode(entry));
		err = 0;
 badentry:
		inode_unlock(d_inode(entry));
		if (!err)
			d_delete(entry);
	} else {
		err = 0;
	}
	dput(entry);

 unlock:
	inode_unlock(parent);
	iput(parent);
	return err;
}