extern boolean_t spa_writeable(spa_t *spa);
extern boolean_t spa_has_pending_synctask(spa_t *spa);
extern int spa_maxblocksize(spa_t *spa);
+extern int spa_maxdnodesize(spa_t *spa);
extern void zfs_blkptr_verify(spa_t *spa, const blkptr_t *bp);
extern int spa_mode(spa_t *spa);