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/*-------------------------------------------------------------------------
*
* mxactdesc.c
* rmgr descriptor routines for access/transam/multixact.c
*
* Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/backend/access/rmgrdesc/mxactdesc.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/multixact.h"
static void
out_member(StringInfo buf, MultiXactMember *member)
{
appendStringInfo(buf, "%u ", member->xid);
switch (member->status)
{
case MultiXactStatusForKeyShare:
appendStringInfoString(buf, "(keysh) ");
break;
case MultiXactStatusForShare:
appendStringInfoString(buf, "(sh) ");
break;
case MultiXactStatusForNoKeyUpdate:
appendStringInfoString(buf, "(fornokeyupd) ");
break;
case MultiXactStatusForUpdate:
appendStringInfoString(buf, "(forupd) ");
break;
case MultiXactStatusNoKeyUpdate:
appendStringInfoString(buf, "(nokeyupd) ");
break;
case MultiXactStatusUpdate:
appendStringInfoString(buf, "(upd) ");
break;
default:
appendStringInfoString(buf, "(unk) ");
break;
}
}
void
multixact_desc(StringInfo buf, XLogReaderState *record)
{
char *rec = XLogRecGetData(record);
uint8 info = XLogRecGetInfo(record) & ~XLR_INFO_MASK;
if (info == XLOG_MULTIXACT_ZERO_OFF_PAGE ||
info == XLOG_MULTIXACT_ZERO_MEM_PAGE)
{
int pageno;
memcpy(&pageno, rec, sizeof(int));
appendStringInfo(buf, "%d", pageno);
}
else if (info == XLOG_MULTIXACT_CREATE_ID)
{
xl_multixact_create *xlrec = (xl_multixact_create *) rec;
int i;
appendStringInfo(buf, "%u offset %u nmembers %d: ", xlrec->mid,
xlrec->moff, xlrec->nmembers);
for (i = 0; i < xlrec->nmembers; i++)
out_member(buf, &xlrec->members[i]);
}
else if (info == XLOG_MULTIXACT_TRUNCATE_ID)
{
xl_multixact_truncate *xlrec = (xl_multixact_truncate *) rec;
appendStringInfo(buf, "offsets [%u, %u), members [%u, %u)",
xlrec->startTruncOff, xlrec->endTruncOff,
xlrec->startTruncMemb, xlrec->endTruncMemb);
}
}
const char *
multixact_identify(uint8 info)
{
const char *id = NULL;
switch (info & ~XLR_INFO_MASK)
{
case XLOG_MULTIXACT_ZERO_OFF_PAGE:
id = "ZERO_OFF_PAGE";
break;
case XLOG_MULTIXACT_ZERO_MEM_PAGE:
id = "ZERO_MEM_PAGE";
break;
case XLOG_MULTIXACT_CREATE_ID:
id = "CREATE_ID";
break;
case XLOG_MULTIXACT_TRUNCATE_ID:
id = "TRUNCATE_ID";
break;
}
return id;
}
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