spa_feature_decr
spa_feature_decr(dmu_objset_spa(os), SPA_FEATURE_EMPTY_BPOBJ, tx);
spa_feature_decr(dmu_objset_spa(mos),
spa_feature_decr(dmu_objset_spa(mos),
spa_feature_decr(dp->dp_spa, SPA_FEATURE_BOOKMARKS, tx);
spa_feature_decr(spa, f, tx);
spa_feature_decr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx);
spa_feature_decr(dp->dp_spa, SPA_FEATURE_BOOKMARKS, tx);
spa_feature_decr(dp->dp_spa, SPA_FEATURE_OBSOLETE_COUNTS, tx);
spa_feature_decr(spa, SPA_FEATURE_ASYNC_DESTROY, tx);
spa_feature_decr(spa, SPA_FEATURE_POOL_CHECKPOINT, tx);
spa_feature_decr(spa,
extern void spa_feature_decr(struct spa *, spa_feature_t, struct dmu_tx *);
spa_feature_decr(spa, SPA_FEATURE_RESILVER_DEFER, tx);
spa_feature_decr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx);
spa_feature_decr(os->os_spa, SPA_FEATURE_OBSOLETE_COUNTS, tx);
spa_feature_decr(spa, SPA_FEATURE_DEVICE_REMOVAL, tx);
spa_feature_decr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx);
spa_feature_decr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx);