ITS#7672 fix mdb_dbi_flags

Use a txn instead of env argument. Only return persistent flags.

libraries/liblmdb/lmdb.h

@@ -920,12 +920,12 @@ int  mdb_stat(MDB_txn *txn, MDB_dbi dbi, MDB_stat *stat);
 
 	/** @brief Retrieve the DB flags for a database handle.
 	 *
-	 * @param[in] env An environment handle returned by #mdb_env_create()
+	 * @param[in] txn A transaction handle returned by #mdb_txn_begin()
 	 * @param[in] dbi A database handle returned by #mdb_dbi_open()
 	 * @param[out] flags Address where the flags will be returned.
 	 * @return A non-zero error value on failure and 0 on success.
 	 */
-int mdb_dbi_flags(MDB_env *env, MDB_dbi dbi, unsigned int *flags);
+int mdb_dbi_flags(MDB_txn *txn, MDB_dbi dbi, unsigned int *flags);
 
 	/** @brief Close a database handle.
 	 *

libraries/liblmdb/mdb.c

@@ -7968,7 +7968,6 @@ int mdb_dbi_open(MDB_txn *txn, const char *name, unsigned int flags, MDB_dbi *db
 		txn->mt_dbflags[slot] = dbflag;
 		memcpy(&txn->mt_dbs[slot], data.mv_data, sizeof(MDB_db));
 		*dbi = slot;
-		txn->mt_env->me_dbflags[slot] = txn->mt_dbs[slot].md_flags;
 		mdb_default_cmp(txn, slot);
 		if (!unused) {
 			txn->mt_numdbs++;
@@ -8004,12 +8003,12 @@ void mdb_dbi_close(MDB_env *env, MDB_dbi dbi)
 	free(ptr);
 }
 
-int mdb_dbi_flags(MDB_env *env, MDB_dbi dbi, unsigned int *flags)
+int mdb_dbi_flags(MDB_txn *txn, MDB_dbi dbi, unsigned int *flags)
 {
 	/* We could return the flags for the FREE_DBI too but what's the point? */
-	if (dbi < MAIN_DBI || dbi >= env->me_numdbs)
+	if (txn == NULL || dbi < MAIN_DBI || dbi >= txn->mt_numdbs)
 		return EINVAL;
-	*flags = env->me_dbflags[dbi];
+	*flags = txn->mt_dbs[dbi].md_flags & PERSISTENT_FLAGS;
 	return MDB_SUCCESS;
 }