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4171 clean up spa_feature_*() interfaces
4172 implement extensible_dataset feature for use by other zpool features
Reviewed by: Max Grossman <max.grossman@delphix.com>
Reviewed by: Christopher Siden <christopher.siden@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>


 588 
 589         /* visit the MOS */
 590         err = traverse_impl(spa, NULL, 0, spa_get_rootblkptr(spa),
 591             txg_start, NULL, flags, func, arg);
 592         if (err != 0)
 593                 return (err);
 594 
 595         /* visit each dataset */
 596         for (obj = 1; err == 0 || (err != ESRCH && hard);
 597             err = dmu_object_next(mos, &obj, FALSE, txg_start)) {
 598                 dmu_object_info_t doi;
 599 
 600                 err = dmu_object_info(mos, obj, &doi);
 601                 if (err != 0) {
 602                         if (!hard)
 603                                 return (err);
 604                         lasterr = err;
 605                         continue;
 606                 }
 607 
 608                 if (doi.doi_type == DMU_OT_DSL_DATASET) {
 609                         dsl_dataset_t *ds;
 610                         uint64_t txg = txg_start;
 611 
 612                         dsl_pool_config_enter(dp, FTAG);
 613                         err = dsl_dataset_hold_obj(dp, obj, FTAG, &ds);
 614                         dsl_pool_config_exit(dp, FTAG);
 615                         if (err != 0) {
 616                                 if (!hard)
 617                                         return (err);
 618                                 lasterr = err;
 619                                 continue;
 620                         }
 621                         if (ds->ds_phys->ds_prev_snap_txg > txg)
 622                                 txg = ds->ds_phys->ds_prev_snap_txg;
 623                         err = traverse_dataset(ds, txg, flags, func, arg);
 624                         dsl_dataset_rele(ds, FTAG);
 625                         if (err != 0) {
 626                                 if (!hard)
 627                                         return (err);
 628                                 lasterr = err;



 588 
 589         /* visit the MOS */
 590         err = traverse_impl(spa, NULL, 0, spa_get_rootblkptr(spa),
 591             txg_start, NULL, flags, func, arg);
 592         if (err != 0)
 593                 return (err);
 594 
 595         /* visit each dataset */
 596         for (obj = 1; err == 0 || (err != ESRCH && hard);
 597             err = dmu_object_next(mos, &obj, FALSE, txg_start)) {
 598                 dmu_object_info_t doi;
 599 
 600                 err = dmu_object_info(mos, obj, &doi);
 601                 if (err != 0) {
 602                         if (!hard)
 603                                 return (err);
 604                         lasterr = err;
 605                         continue;
 606                 }
 607 
 608                 if (doi.doi_bonus_type == DMU_OT_DSL_DATASET) {
 609                         dsl_dataset_t *ds;
 610                         uint64_t txg = txg_start;
 611 
 612                         dsl_pool_config_enter(dp, FTAG);
 613                         err = dsl_dataset_hold_obj(dp, obj, FTAG, &ds);
 614                         dsl_pool_config_exit(dp, FTAG);
 615                         if (err != 0) {
 616                                 if (!hard)
 617                                         return (err);
 618                                 lasterr = err;
 619                                 continue;
 620                         }
 621                         if (ds->ds_phys->ds_prev_snap_txg > txg)
 622                                 txg = ds->ds_phys->ds_prev_snap_txg;
 623                         err = traverse_dataset(ds, txg, flags, func, arg);
 624                         dsl_dataset_rele(ds, FTAG);
 625                         if (err != 0) {
 626                                 if (!hard)
 627                                         return (err);
 628                                 lasterr = err;