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ovsdb: row: Add support for xor-based row updates.

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This will be used to apply update3 type updates to ovsdb tables
while processing updates for future ovsdb 'relay' service model.

'ovsdb_datum_apply_diff' is allowed to fail, so adding support
to return this error.

Acked-by: Mark D. Gray <mark.d.gray@redhat.com>
Acked-by: Dumitru Ceara <dceara@redhat.com>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
This commit is contained in:
Ilya Maximets 2021-06-01 23:01:22 +02:00
parent 85dbbe275b
commit b4cef64c83
6 changed files with 39 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
ovsdb/execution.c
View File

@ -483,8 +483,9 @@ update_row_cb(const struct ovsdb_row *row, void *ur_)
ur->n_matches++;
if (!ovsdb_row_equal_columns(row, ur->row, ur->columns)) {
ovsdb_row_update_columns(ovsdb_txn_row_modify(ur->txn, row),
ur->row, ur->columns);
ovsdb_error_assert(ovsdb_row_update_columns(
ovsdb_txn_row_modify(ur->txn, row),
ur->row, ur->columns, false));
}
return true;

2
ovsdb/replication.c
View File

@ -677,7 +677,7 @@ process_table_update(struct json *table_update, const char *table_name,
struct ovsdb_error *error;
error = (!new ? ovsdb_table_execute_delete(txn, &uuid, table)
: !old ? ovsdb_table_execute_insert(txn, &uuid, table, new)
: ovsdb_table_execute_update(txn, &uuid, table, new));
: ovsdb_table_execute_update(txn, &uuid, table, new, false));
if (error) {
if (!strcmp(ovsdb_error_get_tag(error), "consistency violation")) {
ovsdb_error_assert(error);

30
ovsdb/row.c
View File

@ -163,20 +163,40 @@ ovsdb_row_equal_columns(const struct ovsdb_row *a,
return true;
}
void
struct ovsdb_error *
ovsdb_row_update_columns(struct ovsdb_row *dst,
const struct ovsdb_row *src,
const struct ovsdb_column_set *columns)
const struct ovsdb_column_set *columns,
bool xor)
{
size_t i;
for (i = 0; i < columns->n_columns; i++) {
const struct ovsdb_column *column = columns->columns[i];
struct ovsdb_datum xor_datum;
struct ovsdb_error *error;
if (xor) {
error = ovsdb_datum_apply_diff(&xor_datum,
&dst->fields[column->index],
&src->fields[column->index],
&column->type);
if (error) {
return error;
}
}
ovsdb_datum_destroy(&dst->fields[column->index], &column->type);
ovsdb_datum_clone(&dst->fields[column->index],
&src->fields[column->index],
&column->type);
if (xor) {
ovsdb_datum_swap(&dst->fields[column->index], &xor_datum);
} else {
ovsdb_datum_clone(&dst->fields[column->index],
&src->fields[column->index],
&column->type);
}
}
return NULL;
}
/* Appends the string form of the value in 'row' of each of the columns in

6
ovsdb/row.h
View File

@ -82,8 +82,10 @@ bool ovsdb_row_equal_columns(const struct ovsdb_row *,
int ovsdb_row_compare_columns_3way(const struct ovsdb_row *,
const struct ovsdb_row *,
const struct ovsdb_column_set *);
void ovsdb_row_update_columns(struct ovsdb_row *, const struct ovsdb_row *,
const struct ovsdb_column_set *);
struct ovsdb_error *ovsdb_row_update_columns(struct ovsdb_row *,
const struct ovsdb_row *,
const struct ovsdb_column_set *,
bool xor);
void ovsdb_row_columns_to_string(const struct ovsdb_row *,
const struct ovsdb_column_set *, struct ds *);
struct ovsdb_error *ovsdb_row_from_json(struct ovsdb_row *,

9
ovsdb/table.c
View File

@ -384,7 +384,8 @@ ovsdb_table_execute_delete(struct ovsdb_txn *txn, const struct uuid *row_uuid,
struct ovsdb_error *
ovsdb_table_execute_update(struct ovsdb_txn *txn, const struct uuid *row_uuid,
struct ovsdb_table *table, struct json *json_row)
struct ovsdb_table *table, struct json *json_row,
bool xor)
{
const struct ovsdb_row *row = ovsdb_table_get_row(table, row_uuid);
if (!row) {
@ -399,9 +400,9 @@ ovsdb_table_execute_update(struct ovsdb_txn *txn, const struct uuid *row_uuid,
struct ovsdb_error *error = ovsdb_row_from_json(update, json_row,
NULL, &columns);
if (!error && !ovsdb_row_equal_columns(row, update, &columns)) {
ovsdb_row_update_columns(ovsdb_txn_row_modify(txn, row),
update, &columns);
if (!error && (xor || !ovsdb_row_equal_columns(row, update, &columns))) {
error = ovsdb_row_update_columns(ovsdb_txn_row_modify(txn, row),
update, &columns, xor);
}
ovsdb_column_set_destroy(&columns);

2
ovsdb/table.h
View File

@ -82,6 +82,6 @@ struct ovsdb_error *ovsdb_table_execute_delete(struct ovsdb_txn *txn,
struct ovsdb_error *ovsdb_table_execute_update(struct ovsdb_txn *txn,
const struct uuid *row_uuid,
struct ovsdb_table *table,
struct json *new);
struct json *new, bool xor);
#endif /* ovsdb/table.h */