rem: devfs_rewind_dir(fs_cookie _fs, fs_vnode _vnode, file_cookie _cookie)
add: devfs_rewind_dir(fs_volume _fs, fs_vnode _vnode, fs_cookie _cookie)
context: devfs_rewind_dir(fs_cookie _fs, fs_vnode _vnode, file_cookie _cookie){	struct devfs *fs = _fs;	struct devfs_cookie *cookie = _cookie;	TRACE(("devfs_rewind_dir: vnode %p, cookie %p\n", _vnode, _cookie));	if (cookie->stream->type != STREAM_TYPE_DIR)		return EINVAL;		mutex_lock(&fs->lock);	cookie->u.dir.ptr = cookie->stream->u.dir.dir_head;	mutex_unlock(&fs->lock);	return B_OK;}