Prepare Open vSwitch 1.1.2 release.

[sliver-openvswitch.git] / ovsdb / row.h

diff --git a/ovsdb/row.h b/ovsdb/row.h
index 55c4f14..6c249a1 100644 (file)
--- a/ovsdb/row.h
+++ b/ovsdb/row.h
@@ -1,4 +1,4 @@
-/* Copyright (c) 2009 Nicira Networks
+/* Copyright (c) 2009, 2010 Nicira Networks
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -20,15 +20,44 @@
 #include <stdint.h>
 #include "column.h"
 #include "hmap.h"
+#include "list.h"
 #include "ovsdb-data.h"
 
 struct ovsdb_column_set;
 
+/* A weak reference.
+ *
+ * When a column in row A contains a weak reference to UUID of a row B this
+ * constitutes a weak reference from A (the source) to B (the destination).
+ *
+ * Rows A and B may be in the same table or different tables.
+ *
+ * Weak references from a row to itself are allowed, but no "struct
+ * ovsdb_weak_ref" structures are created for them.
+ */
+struct ovsdb_weak_ref {
+    struct list src_node;       /* In src->src_refs list. */
+    struct list dst_node;       /* In destination row's dst_refs list. */
+    struct ovsdb_row *src;      /* Source row. */
+};
+
 /* A row in a database table. */
 struct ovsdb_row {
-    struct ovsdb_table *table;  /* Table to which this belongs. */
-    struct hmap_node hmap_node; /* Element in ovsdb_table's 'rows' hmap. */
+    struct ovsdb_table *table;     /* Table to which this belongs. */
+    struct hmap_node hmap_node;    /* Element in ovsdb_table's 'rows' hmap. */
     struct ovsdb_txn_row *txn_row; /* Transaction that row is in, if any. */
+
+    /* Weak references. */
+    struct list src_refs;       /* Weak references from this row. */
+    struct list dst_refs;       /* Weak references to this row. */
+
+    /* Number of strong refs to this row from other rows, in this table or
+     * other tables, through 'uuid' columns that have a 'refTable' constraint
+     * pointing to this table and a 'refType' of "strong".  A row with nonzero
+     * 'n_refs' cannot be deleted.  Updated and checked only at transaction
+     * commit. */
+    size_t n_refs;
+
     struct ovsdb_datum fields[];
 };
 
@@ -50,7 +79,7 @@ void ovsdb_row_update_columns(struct ovsdb_row *, const struct ovsdb_row *,
 
 struct ovsdb_error *ovsdb_row_from_json(struct ovsdb_row *,
                                         const struct json *,
-                                        const struct ovsdb_symbol_table *,
+                                        struct ovsdb_symbol_table *,
                                         struct ovsdb_column_set *included)
     WARN_UNUSED_RESULT;
 struct json *ovsdb_row_to_json(const struct ovsdb_row *,