NREAD
NREAD(X_HZ, &hz, sizeof(hz));
NREAD(X_STATHZ, &stathz, sizeof(stathz));
NREAD(X_BUFFERSPACE, &ls->bufspace, sizeof(ls->bufspace));
NREAD(X_DESIREDVNODES, &ls->maxvnodes, sizeof(ls->maxvnodes));
NREAD(X_CACHEDVNODES, &ls->cachedvnodes, sizeof(ls->cachedvnodes));
NREAD(X_INACTIVEVNODES, &ls->inactivevnodes,
NREAD(X_ACTIVEVNODES, &ls->activevnodes, sizeof(ls->activevnodes));
NREAD(X_NUMDIRTYBUFFERS, &ls->dirtybufspace, sizeof(ls->dirtybufspace));