greenplumn smgrdesc 源码
greenplumn smgrdesc 代码
文件路径：/src/backend/access/rmgrdesc/smgrdesc.c
/*-------------------------------------------------------------------------
*
* smgrdesc.c
* rmgr descriptor routines for catalog/storage.c
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/backend/access/rmgrdesc/smgrdesc.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "catalog/storage_xlog.h"
void
smgr_desc(StringInfo buf, XLogReaderState *record)
{
char *rec = XLogRecGetData(record);
uint8 info = XLogRecGetInfo(record) & ~XLR_INFO_MASK;
if (info == XLOG_SMGR_CREATE)
{
xl_smgr_create *xlrec = (xl_smgr_create *) rec;
char *path = relpathperm(xlrec->rnode, xlrec->forkNum);
appendStringInfo(buf, "%s; smgr: %s", path, xlrec->impl == SMGR_MD ? "heap" : "ao");
pfree(path);
}
else if (info == XLOG_SMGR_TRUNCATE)
{
xl_smgr_truncate *xlrec = (xl_smgr_truncate *) rec;
char *path = relpathperm(xlrec->rnode, MAIN_FORKNUM);
appendStringInfo(buf, "%s to %u blocks flags %d", path,
xlrec->blkno, xlrec->flags);
pfree(path);
}
}
const char *
smgr_identify(uint8 info)
{
const char *id = NULL;
switch (info & ~XLR_INFO_MASK)
{
case XLOG_SMGR_CREATE:
id = "CREATE";
break;
case XLOG_SMGR_TRUNCATE:
id = "TRUNCATE";
break;
}
return id;
}
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