Remove ::g_max_datacarrier_bytes global

src/kernel/mempool_options.h

@@ -8,9 +8,11 @@
 
 #include <policy/feerate.h>
 #include <policy/policy.h>
+#include <script/standard.h>
 
 #include <chrono>
 #include <cstdint>
+#include <optional>
 
 class CBlockPolicyEstimator;
 
@@ -40,6 +42,14 @@ struct MemPoolOptions {
     /** A fee rate smaller than this is considered zero fee (for relaying, mining and transaction creation) */
     CFeeRate min_relay_feerate{DEFAULT_MIN_RELAY_TX_FEE};
     CFeeRate dust_relay_feerate{DUST_RELAY_TX_FEE};
+    /**
+     * A data carrying output is an unspendable output containing data. The script
+     * type is designated as TxoutType::NULL_DATA.
+     *
+     * Maximum size of TxoutType::NULL_DATA scripts that this node considers standard.
+     * If nullopt, any size is nonstandard.
+     */
+    std::optional<unsigned> max_datacarrier_bytes{DEFAULT_ACCEPT_DATACARRIER ? std::optional{MAX_OP_RETURN_RELAY} : std::nullopt};
     bool permit_bare_multisig{DEFAULT_PERMIT_BAREMULTISIG};
     bool require_standard{true};
     bool full_rbf{DEFAULT_MEMPOOL_FULL_RBF};