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/*
* brin_xlog.c
* XLog replay routines for BRIN indexes
*
* Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* src/backend/access/brin/brin_xlog.c
*/
#include "postgres.h"
#include "access/brin_page.h"
#include "access/brin_pageops.h"
#include "access/brin_xlog.h"
#include "access/bufmask.h"
#include "access/xlogutils.h"
/*
* xlog replay routines
*/
static void
brin_xlog_createidx(XLogReaderState *record)
{
XLogRecPtr lsn = record->EndRecPtr;
xl_brin_createidx *xlrec = (xl_brin_createidx *) XLogRecGetData(record);
Buffer buf;
Page page;
/* create the index' metapage */
buf = XLogInitBufferForRedo(record, 0);
Assert(BufferIsValid(buf));
page = (Page) BufferGetPage(buf);
brin_metapage_init(page, xlrec->pagesPerRange, xlrec->version);
PageSetLSN(page, lsn);
MarkBufferDirty(buf);
UnlockReleaseBuffer(buf);
}
/*
* Common part of an insert or update. Inserts the new tuple and updates the
* revmap.
*/
static void
brin_xlog_insert_update(XLogReaderState *record,
xl_brin_insert *xlrec)
{
XLogRecPtr lsn = record->EndRecPtr;
Buffer buffer;
BlockNumber regpgno;
Page page;
XLogRedoAction action;
/*
* If we inserted the first and only tuple on the page, re-initialize the
* page from scratch.
*/
if (XLogRecGetInfo(record) & XLOG_BRIN_INIT_PAGE)
{
buffer = XLogInitBufferForRedo(record, 0);
page = BufferGetPage(buffer);
brin_page_init(page, BRIN_PAGETYPE_REGULAR);
action = BLK_NEEDS_REDO;
}
else
{
action = XLogReadBufferForRedo(record, 0, &buffer);
}
/* need this page's blkno to store in revmap */
regpgno = BufferGetBlockNumber(buffer);
/* insert the index item into the page */
if (action == BLK_NEEDS_REDO)
{
OffsetNumber offnum;
BrinTuple *tuple;
Size tuplen;
tuple = (BrinTuple *) XLogRecGetBlockData(record, 0, &tuplen);
Assert(tuple->bt_blkno == xlrec->heapBlk);
page = (Page) BufferGetPage(buffer);
offnum = xlrec->offnum;
if (PageGetMaxOffsetNumber(page) + 1 < offnum)
elog(PANIC, "brin_xlog_insert_update: invalid max offset number");
offnum = PageAddItem(page, (Item) tuple, tuplen, offnum, true, false);
if (offnum == InvalidOffsetNumber)
elog(PANIC, "brin_xlog_insert_update: failed to add tuple");
PageSetLSN(page, lsn);
MarkBufferDirty(buffer);
}
if (BufferIsValid(buffer))
UnlockReleaseBuffer(buffer);
/* update the revmap */
action = XLogReadBufferForRedo(record, 1, &buffer);
if (action == BLK_NEEDS_REDO)
{
ItemPointerData tid;
ItemPointerSet(&tid, regpgno, xlrec->offnum);
page = (Page) BufferGetPage(buffer);
brinSetHeapBlockItemptr(buffer, xlrec->pagesPerRange, xlrec->heapBlk,
tid);
PageSetLSN(page, lsn);
MarkBufferDirty(buffer);
}
if (BufferIsValid(buffer))
UnlockReleaseBuffer(buffer);
/* XXX no FSM updates here ... */
}
/*
* replay a BRIN index insertion
*/
static void
brin_xlog_insert(XLogReaderState *record)
{
xl_brin_insert *xlrec = (xl_brin_insert *) XLogRecGetData(record);
brin_xlog_insert_update(record, xlrec);
}
/*
* replay a BRIN index update
*/
static void
brin_xlog_update(XLogReaderState *record)
{
XLogRecPtr lsn = record->EndRecPtr;
xl_brin_update *xlrec = (xl_brin_update *) XLogRecGetData(record);
Buffer buffer;
XLogRedoAction action;
/* First remove the old tuple */
action = XLogReadBufferForRedo(record, 2, &buffer);
if (action == BLK_NEEDS_REDO)
{
Page page;
OffsetNumber offnum;
page = (Page) BufferGetPage(buffer);
offnum = xlrec->oldOffnum;
PageIndexTupleDeleteNoCompact(page, offnum);
PageSetLSN(page, lsn);
MarkBufferDirty(buffer);
}
/* Then insert the new tuple and update revmap, like in an insertion. */
brin_xlog_insert_update(record, &xlrec->insert);
if (BufferIsValid(buffer))
UnlockReleaseBuffer(buffer);
}
/*
* Update a tuple on a single page.
*/
static void
brin_xlog_samepage_update(XLogReaderState *record)
{
XLogRecPtr lsn = record->EndRecPtr;
xl_brin_samepage_update *xlrec;
Buffer buffer;
XLogRedoAction action;
xlrec = (xl_brin_samepage_update *) XLogRecGetData(record);
action = XLogReadBufferForRedo(record, 0, &buffer);
if (action == BLK_NEEDS_REDO)
{
Size tuplen;
BrinTuple *brintuple;
Page page;
OffsetNumber offnum;
brintuple = (BrinTuple *) XLogRecGetBlockData(record, 0, &tuplen);
page = (Page) BufferGetPage(buffer);
offnum = xlrec->offnum;
if (!PageIndexTupleOverwrite(page, offnum, (Item) brintuple, tuplen))
elog(PANIC, "brin_xlog_samepage_update: failed to replace tuple");
PageSetLSN(page, lsn);
MarkBufferDirty(buffer);
}
if (BufferIsValid(buffer))
UnlockReleaseBuffer(buffer);
/* XXX no FSM updates here ... */
}
/*
* Replay a revmap page extension
*/
static void
brin_xlog_revmap_extend(XLogReaderState *record)
{
XLogRecPtr lsn = record->EndRecPtr;
xl_brin_revmap_extend *xlrec;
Buffer metabuf;
Buffer buf;
Page page;
BlockNumber targetBlk;
XLogRedoAction action;
xlrec = (xl_brin_revmap_extend *) XLogRecGetData(record);
XLogRecGetBlockTag(record, 1, NULL, NULL, &targetBlk);
Assert(xlrec->targetBlk == targetBlk);
/* Update the metapage */
action = XLogReadBufferForRedo(record, 0, &metabuf);
if (action == BLK_NEEDS_REDO)
{
Page metapg;
BrinMetaPageData *metadata;
metapg = BufferGetPage(metabuf);
metadata = (BrinMetaPageData *) PageGetContents(metapg);
Assert(metadata->lastRevmapPage == xlrec->targetBlk - 1);
metadata->lastRevmapPage = xlrec->targetBlk;
PageSetLSN(metapg, lsn);
/*
* Set pd_lower just past the end of the metadata. This is essential,
* because without doing so, metadata will be lost if xlog.c
* compresses the page. (We must do this here because pre-v11
* versions of PG did not set the metapage's pd_lower correctly, so a
* pg_upgraded index might contain the wrong value.)
*/
((PageHeader) metapg)->pd_lower =
((char *) metadata + sizeof(BrinMetaPageData)) - (char *) metapg;
MarkBufferDirty(metabuf);
}
/*
* Re-init the target block as a revmap page. There's never a full- page
* image here.
*/
buf = XLogInitBufferForRedo(record, 1);
page = (Page) BufferGetPage(buf);
brin_page_init(page, BRIN_PAGETYPE_REVMAP);
PageSetLSN(page, lsn);
MarkBufferDirty(buf);
UnlockReleaseBuffer(buf);
if (BufferIsValid(metabuf))
UnlockReleaseBuffer(metabuf);
}
static void
brin_xlog_desummarize_page(XLogReaderState *record)
{
XLogRecPtr lsn = record->EndRecPtr;
xl_brin_desummarize *xlrec;
Buffer buffer;
XLogRedoAction action;
xlrec = (xl_brin_desummarize *) XLogRecGetData(record);
/* Update the revmap */
action = XLogReadBufferForRedo(record, 0, &buffer);
if (action == BLK_NEEDS_REDO)
{
ItemPointerData iptr;
ItemPointerSetInvalid(&iptr);
brinSetHeapBlockItemptr(buffer, xlrec->pagesPerRange, xlrec->heapBlk, iptr);
PageSetLSN(BufferGetPage(buffer), lsn);
MarkBufferDirty(buffer);
}
if (BufferIsValid(buffer))
UnlockReleaseBuffer(buffer);
/* remove the leftover entry from the regular page */
action = XLogReadBufferForRedo(record, 1, &buffer);
if (action == BLK_NEEDS_REDO)
{
Page regPg = BufferGetPage(buffer);
PageIndexTupleDeleteNoCompact(regPg, xlrec->regOffset);
PageSetLSN(regPg, lsn);
MarkBufferDirty(buffer);
}
if (BufferIsValid(buffer))
UnlockReleaseBuffer(buffer);
}
void
brin_redo(XLogReaderState *record)
{
uint8 info = XLogRecGetInfo(record) & ~XLR_INFO_MASK;
switch (info & XLOG_BRIN_OPMASK)
{
case XLOG_BRIN_CREATE_INDEX:
brin_xlog_createidx(record);
break;
case XLOG_BRIN_INSERT:
brin_xlog_insert(record);
break;
case XLOG_BRIN_UPDATE:
brin_xlog_update(record);
break;
case XLOG_BRIN_SAMEPAGE_UPDATE:
brin_xlog_samepage_update(record);
break;
case XLOG_BRIN_REVMAP_EXTEND:
brin_xlog_revmap_extend(record);
break;
case XLOG_BRIN_DESUMMARIZE:
brin_xlog_desummarize_page(record);
break;
default:
elog(PANIC, "brin_redo: unknown op code %u", info);
}
}
/*
* Mask a BRIN page before doing consistency checks.
*/
void
brin_mask(char *pagedata, BlockNumber blkno)
{
Page page = (Page) pagedata;
PageHeader pagehdr = (PageHeader) page;
mask_page_lsn_and_checksum(page);
mask_page_hint_bits(page);
/*
* Regular brin pages contain unused space which needs to be masked.
* Similarly for meta pages, but mask it only if pd_lower appears to have
* been set correctly.
*/
if (BRIN_IS_REGULAR_PAGE(page) ||
(BRIN_IS_META_PAGE(page) && pagehdr->pd_lower > SizeOfPageHeaderData))
{
mask_unused_space(page);
}
/*
* BRIN_EVACUATE_PAGE is not WAL-logged, since it's of no use in recovery.
* Mask it. See brin_start_evacuating_page() for details.
*/
BrinPageFlags(page) &= ~BRIN_EVACUATE_PAGE;
}
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