xfs_lookup
error = xfs_lookup(XFS_I(d_inode(child)), &xfs_name_dotdot, &cip, NULL);
int xfs_lookup(struct xfs_inode *dp, const struct xfs_name *name,
error = xfs_lookup(XFS_I(dir), &name, &cip, NULL);
error = xfs_lookup(XFS_I(dir), &xname, &ip, &ci_name);
DEFINE_NAMESPACE_EVENT(xfs_lookup);