int lustre_buf2som(void *buf, int rc, struct md_som_data *msd);
int lustre_buf2hsm(void *buf, int rc, struct md_hsm *mh);
-void lustre_hsm2buf(void *buf, struct md_hsm *mh);
+void lustre_hsm2buf(void *buf, const struct md_hsm *mh);
enum {
UCRED_INVALID = -1,