/*
* merge_map_updates
*
* Merge all the updates in the given pending-update map into the target map.
* This is just a bulk form of apply_map_update.
*/
static void
merge_map_updates(RelMapFile *map, const RelMapFile *updates, bool add_okay)
{
int32 i;
for (i = 0; i < updates->num_mappings; i++)
{
apply_map_update(map,
updates->mappings[i].mapoid,
updates->mappings[i].mapfilenode,
add_okay);
}
}
/*
* RelationMapUpdateMap
*
* Install a new relfilenode mapping for the specified relation.
*
* If immediate is true (or we're bootstrapping), the mapping is activated
* immediately. Otherwise it is made pending until CommandCounterIncrement.
*/
void
RelationMapUpdateMap(Oid relationId, Oid fileNode, bool shared,
bool immediate)
{
RelMapFile *map;
if (IsBootstrapProcessingMode())
{
/*
* In bootstrap mode, the mapping gets installed in permanent map.
*/
if (shared)
map = &shared_map;
else
map = &local_map;
}
else
{
/*
* We don't currently support map changes within subtransactions, or
* when in parallel mode. This could be done with more bookkeeping
* infrastructure, but it doesn't presently seem worth it.
*/
if (GetCurrentTransactionNestLevel() > 1)
elog(ERROR, "cannot change relation mapping within subtransaction");
if (IsInParallelMode())
elog(ERROR, "cannot change relation mapping in parallel mode");
if (immediate)
{
/* Make it active, but only locally */
if (shared)
map = &active_shared_updates;
else
map = &active_local_updates;
}
else
{
/* Make it pending */
if (shared)
map = &pending_shared_updates;
else
map = &pending_local_updates;
}
}
apply_map_update(map, relationId, fileNode, true);
}
