DM_USE_MOUNT
if (strcmp(what, DM_USE_MOUNT) == 0) {
(void) build_usage_string(dname, DM_USE_MOUNT, "swap", msg,
if ((strcmp(by, DM_USE_MOUNT) == 0 &&
libdiskmgt_add_str(attrs, DM_USED_BY, DM_USE_MOUNT, errp);