Fix for 44623f2

(PostgreSQL 15: all shared memory requests in shmem_request_hook())

Author: Andrei Kruchinin

src/ddl.c

@@ -169,6 +169,13 @@ MtmDDLReplicationInit()
 	prev_shmem_request_hook = shmem_request_hook;
 	shmem_request_hook = mtm_ddl_shmem_request;
 #else
+	Size		size = 0;
+
+	size = add_size(size, sizeof(struct DDLSharedState));
+	size = add_size(size, hash_estimate_size(MULTIMASTER_MAX_LOCAL_TABLES,
+											 sizeof(Oid)));
+	size = MAXALIGN(size);
+
 	RequestAddinShmemSpace(size);
 
 	RequestNamedLWLockTranche("mtm-ddl", 1);

src/global_tx.c

@@ -163,6 +163,13 @@ MtmGlobalTxInit()
 	prev_shmem_request_hook = shmem_request_hook;
 	shmem_request_hook = mtm_gtx_shmem_request;
 #else
+	Size		size = 0;
+
+	size = add_size(size, sizeof(gtx_shared_data));
+	size = add_size(size, hash_estimate_size(2*MaxConnections,
+											 sizeof(GlobalTx)));
+	size = MAXALIGN(size);
+
 	RequestAddinShmemSpace(size);
 	RequestNamedLWLockTranche("mtm-gtx-lock", 1);
 #endif