mpool_open
MPOOL *mpool_open(void *, int, pgno_t, pgno_t);
mpool_open(NULL, t->bt_fd, t->bt_psize, ncache)) == NULL)
__weak_alias(mpool_open,_mpool_open)
mpool_open(void *key, int fd, pgno_t pagesize, pgno_t maxcache)