Cleanup: Add flag DB_DUPDATA, drop DB_DIRTY hack

Author: hfuru

libraries/liblmdb/mdb.c

@@ -1078,11 +1078,12 @@ struct MDB_txn {
  *	@ingroup internal
  * @{
  */
-#define DB_DIRTY	0x01		/**< DB was modified or is DUPSORT data */
+#define DB_DIRTY	0x01		/**< DB was written in this txn */
 #define DB_STALE	0x02		/**< Named-DB record is older than txnID */
 #define DB_NEW		0x04		/**< Named-DB handle opened in this txn */
 #define DB_VALID	0x08		/**< DB handle is valid, see also #MDB_VALID */
 #define DB_USRVALID	0x10		/**< As #DB_VALID, but not set for #FREE_DBI */
+#define DB_DUPDATA	0x20		/**< DB is #MDB_DUPSORT data */
 /** @} */
 	/** In write txns, array of cursors for each DB */
 	MDB_cursor	**mt_cursors;
@@ -6270,7 +6271,8 @@ mdb_cursor_touch(MDB_cursor *mc)
 {
 	int rc = MDB_SUCCESS;
 
-	if (mc->mc_dbi >= CORE_DBS && !(*mc->mc_dbflag & DB_DIRTY)) {
+	if (mc->mc_dbi >= CORE_DBS && !(*mc->mc_dbflag & (DB_DIRTY|DB_DUPDATA))) {
+		/* Touch DB record of named DB */
 		MDB_cursor mc2;
 		MDB_xcursor mcx;
 		if (TXN_DBI_CHANGED(mc->mc_txn, mc->mc_dbi))
@@ -7331,7 +7333,7 @@ mdb_xcursor_init1(MDB_cursor *mc, MDB_node *node)
 	}
 	DPRINTF(("Sub-db -%u root page %"Z"u", mx->mx_cursor.mc_dbi,
 		mx->mx_db.md_root));
-	mx->mx_dbflag = DB_VALID|DB_USRVALID|DB_DIRTY; /* DB_DIRTY guides mdb_cursor_touch */
+	mx->mx_dbflag = DB_VALID|DB_USRVALID|DB_DUPDATA;
 #if UINT_MAX < SIZE_MAX
 	if (mx->mx_dbx.md_cmp == mdb_cmp_int && mx->mx_db.md_pad == sizeof(size_t))
 		mx->mx_dbx.md_cmp = mdb_cmp_clong;
@@ -7357,7 +7359,7 @@ mdb_xcursor_init2(MDB_cursor *mc, MDB_xcursor *src_mx, int new_dupdata)
 		mx->mx_cursor.mc_top = 0;
 		mx->mx_cursor.mc_flags |= C_INITIALIZED;
 		mx->mx_cursor.mc_ki[0] = 0;
-		mx->mx_dbflag = DB_VALID|DB_USRVALID|DB_DIRTY; /* DB_DIRTY guides mdb_cursor_touch */
+		mx->mx_dbflag = DB_VALID|DB_USRVALID|DB_DUPDATA;
 #if UINT_MAX < SIZE_MAX
 		mx->mx_dbx.md_cmp = src_mx->mx_dbx.md_cmp;
 #endif