/* * Checks that the active features in the pool are supported by * this software. Adds each unsupported feature (name -> description) to * the supplied nvlist. */ boolean_t spa_features_check(spa_t *spa, boolean_t for_write, nvlist_t *unsup_feat, nvlist_t *enabled_feat) { objset_t *os = spa->spa_meta_objset; boolean_t supported; zap_cursor_t *zc; zap_attribute_t *za; uint64_t obj = for_write ? spa->spa_feat_for_write_obj : spa->spa_feat_for_read_obj; char *buf; zc = kmem_alloc(sizeof (zap_cursor_t), KM_SLEEP); za = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP); buf = kmem_alloc(MAXPATHLEN, KM_SLEEP); supported = B_TRUE; for (zap_cursor_init(zc, os, obj); zap_cursor_retrieve(zc, za) == 0; zap_cursor_advance(zc)) { ASSERT(za->za_integer_length == sizeof (uint64_t) && za->za_num_integers == 1); if (NULL != enabled_feat) { fnvlist_add_uint64(enabled_feat, za->za_name, za->za_first_integer); } if (za->za_first_integer != 0 && !zfeature_is_supported(za->za_name)) { supported = B_FALSE; if (NULL != unsup_feat) { char *desc = ""; if (zap_lookup(os, spa->spa_feat_desc_obj, za->za_name, 1, MAXPATHLEN, buf) == 0) desc = buf; VERIFY(nvlist_add_string(unsup_feat, za->za_name, desc) == 0); } } } zap_cursor_fini(zc); kmem_free(buf, MAXPATHLEN); kmem_free(za, sizeof (zap_attribute_t)); kmem_free(zc, sizeof (zap_cursor_t)); return (supported); }
/* * Checks that the features active in the specified object are supported by * this software. Adds each unsupported feature (name -> description) to * the supplied nvlist. */ boolean_t feature_is_supported(objset_t *os, uint64_t obj, uint64_t desc_obj, nvlist_t *unsup_feat, nvlist_t *enabled_feat) { boolean_t supported; zap_cursor_t zc; zap_attribute_t za; supported = B_TRUE; for (zap_cursor_init(&zc, os, obj); zap_cursor_retrieve(&zc, &za) == 0; zap_cursor_advance(&zc)) { ASSERT(za.za_integer_length == sizeof (uint64_t) && za.za_num_integers == 1); if (NULL != enabled_feat) { fnvlist_add_uint64(enabled_feat, za.za_name, za.za_first_integer); } if (za.za_first_integer != 0 && !zfeature_is_supported(za.za_name)) { supported = B_FALSE; if (NULL != unsup_feat) { char *desc = ""; char buf[MAXPATHLEN]; if (zap_lookup(os, desc_obj, za.za_name, 1, sizeof (buf), buf) == 0) desc = buf; VERIFY(nvlist_add_string(unsup_feat, za.za_name, desc) == 0); } } } zap_cursor_fini(&zc); return (supported); }
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; spa_feature_t nodeps[] = { SPA_FEATURE_NONE }; /* * 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_flags = 0; feature.fi_desc = NULL; feature.fi_depends = nodeps; feature.fi_feature = SPA_FEATURE_NONE; optind = 1; while ((c = getopt(argc, argv, "md")) != -1) { switch (c) { case 'm': feature.fi_flags |= ZFEATURE_FLAG_MOS; 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(NULL, FTAG, "invalid feature guid: %s", feature.fi_guid); zhack_spa_open(target, B_FALSE, FTAG, &spa); mos = spa->spa_meta_objset; if (zfeature_is_supported(feature.fi_guid)) { fatal(spa, FTAG, "'%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_flags &= ~ZFEATURE_FLAG_READONLY_COMPAT; } else if (0 == zap_contains(mos, spa->spa_feat_for_write_obj, feature.fi_guid)) { feature.fi_flags |= ZFEATURE_FLAG_READONLY_COMPAT; } else { fatal(spa, FTAG, "feature is not enabled: %s", feature.fi_guid); } if (decr) { uint64_t count; if (feature_get_refcount_from_disk(spa, &feature, &count) == 0 && count == 0) { fatal(spa, FTAG, "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, ZFS_SPACE_CHECK_NORMAL)); 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; spa_feature_t nodeps[] = { SPA_FEATURE_NONE }; /* * 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_flags = 0; feature.fi_depends = nodeps; feature.fi_feature = SPA_FEATURE_NONE; optind = 1; while ((c = getopt(argc, argv, "rmd:")) != -1) { switch (c) { case 'r': feature.fi_flags |= ZFEATURE_FLAG_READONLY_COMPAT; 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(NULL, FTAG, "invalid feature guid: %s", feature.fi_guid); zhack_spa_open(target, B_FALSE, FTAG, &spa); mos = spa->spa_meta_objset; if (zfeature_is_supported(feature.fi_guid)) fatal(spa, FTAG, "'%s' is a real feature, will not enable"); if (0 == zap_contains(mos, spa->spa_feat_desc_obj, feature.fi_guid)) fatal(spa, FTAG, "feature already enabled: %s", feature.fi_guid); VERIFY0(dsl_sync_task(spa_name(spa), NULL, zhack_feature_enable_sync, &feature, 5, ZFS_SPACE_CHECK_NORMAL)); spa_close(spa, FTAG); free(desc); }