M_MSDOSFSMNT
dehashtbl = hashinit(initialvnodes / 2, M_MSDOSFSMNT, M_WAITOK, &dehash);
pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK | M_ZERO);
free(pmp, M_MSDOSFSMNT, 0);
free(pmp, M_MSDOSFSMNT, 0);