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(ITS#7672) LMDB: mdb_dbi_flags fails with newly created DataBase

Full_Name: Salvador Ortiz
Version: 24
OS: Linux
Submission from: (NULL) (

Using mdb_dbi_flags with newly created database fails or lies.

In the case of MAIN _DBI, if I set some flags in mdb_dbi_open, the flags isn't
propagated to the environment, I think the fix is simple:

--- a/libraries/liblmdb/mdb.c
+++ b/libraries/liblmdb/mdb.c
@@ -7881,6 +7881,7 @@ int mdb_dbi_open(MDB_txn *txn, const char *name, unsigned
int flags, MDB_dbi *db
                        /* make sure flag changes get committed */
                        if ((txn->mt_dbs[MAIN_DBI].md_flags | f2) !=
txn->mt_dbs[MAIN_DBI].md_flags) {
                                txn->mt_dbs[MAIN_DBI].md_flags |= f2;
+                               txn->mt_env->me_dbflags[MAIN_DBI] =
                                txn->mt_flags |= MDB_TXN_DIRTY;

But in the case of a newly created named database, env->me_numdbs isn't adjusted
until the transaction is committed, so mdb_env_flags fails.

The more that I think about it, seems that the proper way to get the flags of an
opened db is with a new API, something like:

int mbd_get_flags(MDB_txn *, MDB_dbi dbi, unsigned int *flags)
	if (txn == NULL || arg == NULL || dbi >= txn->mt_numdbs)
		return EINVAL;

	*flags = txn->mt_dbflags[dbi];
        return MDB_SUCCESS;