ovl_create_object
return ovl_create_object(dentry, (mode & 07777) | S_IFREG, 0, NULL);
return ERR_PTR(ovl_create_object(dentry, (mode & 07777) | S_IFDIR, 0, NULL));
return ovl_create_object(dentry, mode, rdev, NULL);
return ovl_create_object(dentry, S_IFLNK, 0, link);