1083 struct MDB_txn {  struct
1084 	MDB_txn		*mt_parent;		/**< parent of a nested txn */  argument
1086 	MDB_txn		*mt_child;  argument
1087 	pgno_t		mt_next_pgno;	/**< next unallocated page */
1092 	txnid_t		mt_txnid;
1093 	MDB_env		*mt_env;		/**< the DB environment */
1096 	MDB_IDL		mt_free_pgs;
1100 	MDB_page	*mt_loose_pgs;
1102 	int			mt_loose_count;
1107 	MDB_IDL		mt_spill_pgs;
1108 	union {
1113 	} mt_u;
1115 	MDB_dbx		*mt_dbxs;
1117 	MDB_db		*mt_dbs;
1119 	unsigned int	*mt_dbiseqs;
1154 #define MDB_TXN_HAS_CHILD	0x10		/**< txn has an #MDB_txn.%mt_child */  argument
1158 	unsigned int	mt_flags;		/**< @ref mdb_txn */
1164 	unsigned int	mt_dirty_room;