Fix prev commit

It only worked if the freelist was already non-empty

diff --git a/libraries/libmdb/mdb.c b/libraries/libmdb/mdb.c
index 53c0a4f..42e3382 100644 (file)
--- a/libraries/libmdb/mdb.c
+++ b/libraries/libmdb/mdb.c
@@ -6704,17 +6704,19 @@ int mdb_drop(MDB_txn *txn, MDB_dbi dbi, int del)
                txn->mt_dbs[dbi].md_overflow_pages = 0;
                txn->mt_dbs[dbi].md_entries = 0;
                txn->mt_dbs[dbi].md_root = P_INVALID;
-               {
-               MDB_cursor m2;
-               MDB_val key;
-               /* make sure last page of freeDB is touched and on freelist
-                * otherwise if there are no other dirty pages in this txn,
-                * these changes will be ignored.
-                */
-               key.mv_size = MAXKEYSIZE+1;
-               key.mv_data = NULL;
-               mdb_cursor_init(&m2, txn, FREE_DBI, NULL);
-               mdb_page_search(&m2, &key, MDB_PS_MODIFY);
+
+               if (!txn->mt_u.dirty_list[0].mid) {
+                       MDB_cursor m2;
+                       MDB_val key, data;
+                       /* make sure we have at least one dirty page in this txn
+                        * otherwise these changes will be ignored.
+                        */
+                       key.mv_size = sizeof(txnid_t);
+                       key.mv_data = &txn->mt_txnid;
+                       data.mv_size = sizeof(MDB_ID);
+                       data.mv_data = txn->mt_free_pgs;
+                       mdb_cursor_init(&m2, txn, FREE_DBI, NULL);
+                       rc = mdb_cursor_put(&m2, &key, &data, 0);
                }
        }
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