boolean_t zfeature_is_supported(const char *guid) { if (zfeature_checks_disable) return (B_TRUE); return (0 == zfeature_lookup_guid(guid, NULL)); }
static void zhack_do_feature_ref(int argc, char **argv) { char c; char *target; boolean_t decr = B_FALSE; spa_t *spa; objset_t *mos; zfeature_info_t feature; zfeature_info_t *nodeps[] = { NULL }; /* * fi_desc does not matter here because it was written to disk * when the feature was enabled, but we need to properly set the * feature for read or write based on the information we read off * disk later. */ feature.fi_uname = "zhack"; feature.fi_mos = B_FALSE; feature.fi_desc = NULL; feature.fi_depends = nodeps; optind = 1; while ((c = getopt(argc, argv, "md")) != -1) { switch (c) { case 'm': feature.fi_mos = B_TRUE; break; case 'd': decr = B_TRUE; break; default: usage(); break; } } argc -= optind; argv += optind; if (argc < 2) { (void) fprintf(stderr, "error: missing feature or pool name\n"); usage(); } target = argv[0]; feature.fi_guid = argv[1]; if (!zfeature_is_valid_guid(feature.fi_guid)) fatal("invalid feature guid: %s", feature.fi_guid); zhack_spa_open(target, B_FALSE, FTAG, &spa); mos = spa->spa_meta_objset; if (0 == zfeature_lookup_guid(feature.fi_guid, NULL)) fatal("'%s' is a real feature, will not change refcount"); if (0 == zap_contains(mos, spa->spa_feat_for_read_obj, feature.fi_guid)) { feature.fi_can_readonly = B_FALSE; } else if (0 == zap_contains(mos, spa->spa_feat_for_write_obj, feature.fi_guid)) { feature.fi_can_readonly = B_TRUE; } else { fatal("feature is not enabled: %s", feature.fi_guid); } if (decr && !spa_feature_is_active(spa, &feature)) fatal("feature refcount already 0: %s", feature.fi_guid); VERIFY0(dsl_sync_task(spa_name(spa), NULL, decr ? feature_decr_sync : feature_incr_sync, &feature, 5)); spa_close(spa, FTAG); }
static void zhack_do_feature_enable(int argc, char **argv) { char c; char *desc, *target; spa_t *spa; objset_t *mos; zfeature_info_t feature; zfeature_info_t *nodeps[] = { NULL }; /* * Features are not added to the pool's label until their refcounts * are incremented, so fi_mos can just be left as false for now. */ desc = NULL; feature.fi_uname = "zhack"; feature.fi_mos = B_FALSE; feature.fi_can_readonly = B_FALSE; feature.fi_depends = nodeps; optind = 1; while ((c = getopt(argc, argv, "rmd:")) != -1) { switch (c) { case 'r': feature.fi_can_readonly = B_TRUE; break; case 'd': desc = strdup(optarg); break; default: usage(); break; } } if (desc == NULL) desc = strdup("zhack injected"); feature.fi_desc = desc; argc -= optind; argv += optind; if (argc < 2) { (void) fprintf(stderr, "error: missing feature or pool name\n"); usage(); } target = argv[0]; feature.fi_guid = argv[1]; if (!zfeature_is_valid_guid(feature.fi_guid)) fatal("invalid feature guid: %s", feature.fi_guid); zhack_spa_open(target, B_FALSE, FTAG, &spa); mos = spa->spa_meta_objset; if (0 == zfeature_lookup_guid(feature.fi_guid, NULL)) fatal("'%s' is a real feature, will not enable"); if (0 == zap_contains(mos, spa->spa_feat_desc_obj, feature.fi_guid)) fatal("feature already enabled: %s", feature.fi_guid); VERIFY0(dsl_sync_task(spa_name(spa), NULL, feature_enable_sync, &feature, 5)); spa_close(spa, FTAG); free(desc); }