/*
* Start preparing a state file.
*
* Initializes data structure and inserts the 2PC file header record.
*/
void
StartPrepare(GlobalTransaction gxact)
{
TransactionId xid = gxact->proc.xid;
TwoPhaseFileHeader hdr;
TransactionId *children;
RelFileNode *commitrels;
RelFileNode *abortrels;
/* Initialize linked list */
records.head = palloc0(sizeof(XLogRecData));
records.head->buffer = InvalidBuffer;
records.head->len = 0;
records.head->next = NULL;
records.bytes_free = Max(sizeof(TwoPhaseFileHeader), 512);
records.head->data = palloc(records.bytes_free);
records.tail = records.head;
records.total_len = 0;
/* Create header */
hdr.magic = TWOPHASE_MAGIC;
hdr.total_len = 0; /* EndPrepare will fill this in */
hdr.xid = xid;
hdr.database = gxact->proc.databaseId;
hdr.prepared_at = gxact->prepared_at;
hdr.owner = gxact->owner;
hdr.nsubxacts = xactGetCommittedChildren(&children);
hdr.ncommitrels = smgrGetPendingDeletes(true, &commitrels);
hdr.nabortrels = smgrGetPendingDeletes(false, &abortrels);
StrNCpy(hdr.gid, gxact->gid, GIDSIZE);
save_state_data(&hdr, sizeof(TwoPhaseFileHeader));
/* Add the additional info about subxacts and deletable files */
if (hdr.nsubxacts > 0)
{
save_state_data(children, hdr.nsubxacts * sizeof(TransactionId));
/* While we have the child-xact data, stuff it in the gxact too */
GXactLoadSubxactData(gxact, hdr.nsubxacts, children);
pfree(children);
}
if (hdr.ncommitrels > 0)
{
save_state_data(commitrels, hdr.ncommitrels * sizeof(RelFileNode));
pfree(commitrels);
}
if (hdr.nabortrels > 0)
{
save_state_data(abortrels, hdr.nabortrels * sizeof(RelFileNode));
pfree(abortrels);
}
}
/*
* Register a 2PC record to be written to state file.
*/
void
RegisterTwoPhaseRecord(TwoPhaseRmgrId rmid, uint16 info,
const void *data, uint32 len)
{
TwoPhaseRecordOnDisk record;
record.rmid = rmid;
record.info = info;
record.len = len;
save_state_data(&record, sizeof(TwoPhaseRecordOnDisk));
if (len > 0)
save_state_data(data, len);
}
