ufs_extattr_get_header
static int ufs_extattr_get_header(struct vnode *,
error = ufs_extattr_get_header(vp, attribute, &ueh, &base_offset);
error = ufs_extattr_get_header(vp, uele, &ueh, NULL);
error = ufs_extattr_get_header(vp, attribute, &ueh, &base_offset);