Fix mdb_drop

if it was the only operation in a txn, it would be ignored.

diff --git a/libraries/libmdb/mdb.c b/libraries/libmdb/mdb.c
index d15fa7c..53c0a4f 100644 (file)
--- a/libraries/libmdb/mdb.c
+++ b/libraries/libmdb/mdb.c
@@ -6696,6 +6696,7 @@ int mdb_drop(MDB_txn *txn, MDB_dbi dbi, int del)
                if (!rc)
                        mdb_close(txn->mt_env, dbi);
        } else {
+               /* reset the DB record, mark it dirty */
                txn->mt_dbflags[dbi] |= DB_DIRTY;
                txn->mt_dbs[dbi].md_depth = 0;
                txn->mt_dbs[dbi].md_branch_pages = 0;
@@ -6703,6 +6704,18 @@ 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);
+               }
        }
 leave:
        mdb_cursor_close(mc);