-/* Copyright (c) 2009, 2010 Nicira Networks
+/* Copyright (c) 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
#include "ovsdb-error.h"
#include "ovsdb-parser.h"
#include "ovsdb-types.h"
+#include "simap.h"
#include "table.h"
#include "transaction.h"
struct ovsdb_schema *
-ovsdb_schema_create(const char *name)
+ovsdb_schema_create(const char *name, const char *version, const char *cksum)
{
struct ovsdb_schema *schema;
schema = xzalloc(sizeof *schema);
schema->name = xstrdup(name);
+ schema->version = xstrdup(version);
+ schema->cksum = xstrdup(cksum);
shash_init(&schema->tables);
return schema;
struct ovsdb_schema *new;
struct shash_node *node;
- new = ovsdb_schema_create(old->name);
+ new = ovsdb_schema_create(old->name, old->version, old->cksum);
SHASH_FOR_EACH (node, &old->tables) {
const struct ovsdb_table_schema *ts = node->data;
return new;
}
-
void
ovsdb_schema_destroy(struct ovsdb_schema *schema)
{
}
shash_destroy(&schema->tables);
free(schema->name);
+ free(schema->version);
+ free(schema->cksum);
free(schema);
}
}
static struct ovsdb_error * WARN_UNUSED_RESULT
-ovsdb_schema_check_ref_table(const struct ovsdb_column *column,
+ovsdb_schema_check_ref_table(struct ovsdb_column *column,
const struct shash *tables,
const struct ovsdb_base_type *base,
const char *base_name)
{
- if (base->type == OVSDB_TYPE_UUID && base->u.uuid.refTableName
- && !shash_find(tables, base->u.uuid.refTableName)) {
+ struct ovsdb_table_schema *refTable;
+
+ if (base->type != OVSDB_TYPE_UUID || !base->u.uuid.refTableName) {
+ return NULL;
+ }
+
+ refTable = shash_find_data(tables, base->u.uuid.refTableName);
+ if (!refTable) {
return ovsdb_syntax_error(NULL, NULL,
"column %s %s refers to undefined table %s",
column->name, base_name,
base->u.uuid.refTableName);
- } else {
- return NULL;
}
+
+ if (ovsdb_base_type_is_strong_ref(base) && !refTable->is_root) {
+ /* We cannot allow a strong reference to a non-root table to be
+ * ephemeral: if it is the only reference to a row, then replaying the
+ * database log from disk will cause the referenced row to be deleted,
+ * even though it did exist in memory. If there are references to that
+ * row later in the log (to modify it, to delete it, or just to point
+ * to it), then this will yield a transaction error. */
+ column->persistent = true;
+ }
+
+ return NULL;
+}
+
+static bool
+is_valid_version(const char *s)
+{
+ int n = -1;
+ ignore(ovs_scan(s, "%*[0-9].%*[0-9].%*[0-9]%n", &n));
+ return n != -1 && s[n] == '\0';
+}
+
+/* Returns the number of tables in 'schema''s root set. */
+static size_t
+root_set_size(const struct ovsdb_schema *schema)
+{
+ struct shash_node *node;
+ size_t n_root = 0;
+
+ SHASH_FOR_EACH (node, &schema->tables) {
+ struct ovsdb_table_schema *table = node->data;
+
+ n_root += table->is_root;
+ }
+ return n_root;
}
struct ovsdb_error *
ovsdb_schema_from_json(struct json *json, struct ovsdb_schema **schemap)
{
struct ovsdb_schema *schema;
- const struct json *name, *tables;
+ const struct json *name, *tables, *version_json, *cksum;
struct ovsdb_error *error;
struct shash_node *node;
struct ovsdb_parser parser;
+ const char *version;
*schemap = NULL;
ovsdb_parser_init(&parser, json, "database schema");
name = ovsdb_parser_member(&parser, "name", OP_ID);
+ version_json = ovsdb_parser_member(&parser, "version",
+ OP_STRING | OP_OPTIONAL);
+ cksum = ovsdb_parser_member(&parser, "cksum", OP_STRING | OP_OPTIONAL);
tables = ovsdb_parser_member(&parser, "tables", OP_OBJECT);
error = ovsdb_parser_finish(&parser);
if (error) {
return error;
}
- schema = ovsdb_schema_create(json_string(name));
+ if (version_json) {
+ version = json_string(version_json);
+ if (!is_valid_version(version)) {
+ return ovsdb_syntax_error(json, NULL, "schema version \"%s\" not "
+ "in format x.y.z", version);
+ }
+ } else {
+ /* Backward compatibility with old databases. */
+ version = "";
+ }
+
+ schema = ovsdb_schema_create(json_string(name), version,
+ cksum ? json_string(cksum) : "");
SHASH_FOR_EACH (node, json_object(tables)) {
struct ovsdb_table_schema *table;
shash_add(&schema->tables, table->name, table);
}
- /* Validate that all refTables refer to the names of tables that exist. */
+ /* "isRoot" was not part of the original schema definition. Before it was
+ * added, there was no support for garbage collection. So, for backward
+ * compatibility, if the root set is empty then assume that every table is
+ * in the root set. */
+ if (root_set_size(schema) == 0) {
+ SHASH_FOR_EACH (node, &schema->tables) {
+ struct ovsdb_table_schema *table = node->data;
+
+ table->is_root = true;
+ }
+ }
+
+ /* Validate that all refTables refer to the names of tables that exist.
+ *
+ * Also force certain columns to be persistent, as explained in
+ * ovsdb_schema_check_ref_table(). This requires 'is_root' to be known, so
+ * this must follow the loop updating 'is_root' above. */
SHASH_FOR_EACH (node, &schema->tables) {
struct ovsdb_table_schema *table = node->data;
struct shash_node *node2;
}
*schemap = schema;
- return 0;
+ return NULL;
}
struct json *
{
struct json *json, *tables;
struct shash_node *node;
+ bool default_is_root;
json = json_object_create();
json_object_put_string(json, "name", schema->name);
+ if (schema->version[0]) {
+ json_object_put_string(json, "version", schema->version);
+ }
+ if (schema->cksum[0]) {
+ json_object_put_string(json, "cksum", schema->cksum);
+ }
+
+ /* "isRoot" was not part of the original schema definition. Before it was
+ * added, there was no support for garbage collection. So, for backward
+ * compatibility, if every table is in the root set then do not output
+ * "isRoot" in table schemas. */
+ default_is_root = root_set_size(schema) == shash_count(&schema->tables);
tables = json_object_create();
SHASH_FOR_EACH (node, &schema->tables) {
struct ovsdb_table_schema *table = node->data;
json_object_put(tables, table->name,
- ovsdb_table_schema_to_json(table));
+ ovsdb_table_schema_to_json(table, default_is_root));
}
json_object_put(json, "tables", tables);
return json;
}
+
+/* Returns true if 'a' and 'b' specify equivalent schemas, false if they
+ * differ. */
+bool
+ovsdb_schema_equal(const struct ovsdb_schema *a,
+ const struct ovsdb_schema *b)
+{
+ /* This implementation is simple, stupid, and slow, but I doubt that it
+ * will ever require much maintenance. */
+ struct json *ja = ovsdb_schema_to_json(a);
+ struct json *jb = ovsdb_schema_to_json(b);
+ bool equals = json_equal(ja, jb);
+ json_destroy(ja);
+ json_destroy(jb);
+
+ return equals;
+}
\f
static void
ovsdb_set_ref_table(const struct shash *tables,
}
}
+/* Adds some memory usage statistics for 'db' into 'usage', for use with
+ * memory_report(). */
+void
+ovsdb_get_memory_usage(const struct ovsdb *db, struct simap *usage)
+{
+ const struct shash_node *node;
+ unsigned int cells = 0;
+
+ SHASH_FOR_EACH (node, &db->tables) {
+ const struct ovsdb_table *table = node->data;
+ unsigned int n_columns = shash_count(&table->schema->columns);
+ unsigned int n_rows = hmap_count(&table->rows);
+
+ cells += n_rows * n_columns;
+ }
+
+ simap_increase(usage, "cells", cells);
+}
+
struct ovsdb_table *
ovsdb_get_table(const struct ovsdb *db, const char *name)
{
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