mblock_md_t
mblock_md_t *mb = NULL;
mblock_md_t *mblock = mc->mc_mblocks;
mblock_md_t *mblock;
bcopy(mc_old->mc_mblocks, mblock, nmblocks * sizeof (mblock_md_t));
mblock_md_t *mblock = mc->mc_mblocks;
mblock_md_t *mc_mblocks; /* mblock array */