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zhack: Add 'feature disable' command

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Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #3878
This commit is contained in:
Brian Behlendorf
2015-10-01 16:32:49 -07:00
parent 72c407f827
commit 8302528617
4 changed files with 138 additions and 4 deletions
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module/zfs/zfeature.c
+37
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@@ -380,6 +380,43 @@ feature_enable_sync(spa_t *spa, zfeature_info_t *feature, dmu_tx_t *tx)
}
}
/*
* This function is non-static for zhack; it should otherwise not be used
* outside this file.
*/
void
feature_disable_sync(spa_t *spa, zfeature_info_t *feature, dmu_tx_t *tx)
{
uint64_t descobj = spa->spa_feat_desc_obj;
uint64_t zapobj = feature->fi_can_readonly ?
spa->spa_feat_for_write_obj : spa->spa_feat_for_read_obj;
ASSERT(0 != zapobj);
ASSERT(zfeature_is_valid_guid(feature->fi_guid));
ASSERT3U(spa_version(spa), >=, SPA_VERSION_FEATURES);
if (zap_contains(spa->spa_meta_objset, descobj, feature->fi_guid) == 0)
VERIFY0(zap_remove(spa->spa_meta_objset, descobj,
feature->fi_guid, tx));
if (zap_contains(spa->spa_meta_objset, zapobj, feature->fi_guid) == 0)
VERIFY0(zap_remove(spa->spa_meta_objset, zapobj,
feature->fi_guid, tx));
spa_deactivate_mos_feature(spa, feature->fi_guid);
if (spa_feature_is_enabled(spa, SPA_FEATURE_ENABLED_TXG)) {
uint64_t txgobj = spa->spa_feat_enabled_txg_obj;
if (txgobj && (zap_contains(spa->spa_meta_objset,
txgobj, feature->fi_guid) == 0)) {
spa_feature_decr(spa, SPA_FEATURE_ENABLED_TXG, tx);
VERIFY0(zap_remove(spa->spa_meta_objset, txgobj,
feature->fi_guid, tx));
}
}
}
static void
feature_do_action(spa_t *spa, spa_feature_t fid, feature_action_t action,
dmu_tx_t *tx)