1064 lines
30 KiB
C
1064 lines
30 KiB
C
/*-------------------------------------------------------------------------
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*
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* nbtxlog.c
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* WAL replay logic for btrees.
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*
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*
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* Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* IDENTIFICATION
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* src/backend/access/nbtree/nbtxlog.c
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "access/bufmask.h"
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#include "access/nbtree.h"
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#include "access/nbtxlog.h"
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#include "access/transam.h"
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#include "access/xlog.h"
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#include "access/xlogutils.h"
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#include "miscadmin.h"
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#include "storage/procarray.h"
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#include "utils/memutils.h"
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static MemoryContext opCtx; /* working memory for operations */
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/*
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* _bt_restore_page -- re-enter all the index tuples on a page
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*
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* The page is freshly init'd, and *from (length len) is a copy of what
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* had been its upper part (pd_upper to pd_special). We assume that the
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* tuples had been added to the page in item-number order, and therefore
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* the one with highest item number appears first (lowest on the page).
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*/
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static void
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_bt_restore_page(Page page, char *from, int len)
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{
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IndexTupleData itupdata;
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Size itemsz;
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char *end = from + len;
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Item items[MaxIndexTuplesPerPage];
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uint16 itemsizes[MaxIndexTuplesPerPage];
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int i;
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int nitems;
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/*
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* To get the items back in the original order, we add them to the page in
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* reverse. To figure out where one tuple ends and another begins, we
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* have to scan them in forward order first.
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*/
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i = 0;
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while (from < end)
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{
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/*
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* As we step through the items, 'from' won't always be properly
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* aligned, so we need to use memcpy(). Further, we use Item (which
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* is just a char*) here for our items array for the same reason;
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* wouldn't want the compiler or anyone thinking that an item is
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* aligned when it isn't.
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*/
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memcpy(&itupdata, from, sizeof(IndexTupleData));
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itemsz = IndexTupleSize(&itupdata);
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itemsz = MAXALIGN(itemsz);
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items[i] = (Item) from;
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itemsizes[i] = itemsz;
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i++;
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from += itemsz;
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}
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nitems = i;
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for (i = nitems - 1; i >= 0; i--)
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{
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if (PageAddItem(page, items[i], itemsizes[i], nitems - i,
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false, false) == InvalidOffsetNumber)
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elog(PANIC, "_bt_restore_page: cannot add item to page");
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from += itemsz;
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}
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}
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static void
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_bt_restore_meta(XLogReaderState *record, uint8 block_id)
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{
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XLogRecPtr lsn = record->EndRecPtr;
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Buffer metabuf;
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Page metapg;
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BTMetaPageData *md;
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BTPageOpaque pageop;
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xl_btree_metadata *xlrec;
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char *ptr;
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Size len;
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metabuf = XLogInitBufferForRedo(record, block_id);
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ptr = XLogRecGetBlockData(record, block_id, &len);
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Assert(len == sizeof(xl_btree_metadata));
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Assert(BufferGetBlockNumber(metabuf) == BTREE_METAPAGE);
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xlrec = (xl_btree_metadata *) ptr;
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metapg = BufferGetPage(metabuf);
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_bt_pageinit(metapg, BufferGetPageSize(metabuf));
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md = BTPageGetMeta(metapg);
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md->btm_magic = BTREE_MAGIC;
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md->btm_version = xlrec->version;
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md->btm_root = xlrec->root;
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md->btm_level = xlrec->level;
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md->btm_fastroot = xlrec->fastroot;
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md->btm_fastlevel = xlrec->fastlevel;
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/* Cannot log BTREE_MIN_VERSION index metapage without upgrade */
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Assert(md->btm_version >= BTREE_NOVAC_VERSION);
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md->btm_oldest_btpo_xact = xlrec->oldest_btpo_xact;
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md->btm_last_cleanup_num_heap_tuples = xlrec->last_cleanup_num_heap_tuples;
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md->btm_allequalimage = xlrec->allequalimage;
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pageop = (BTPageOpaque) PageGetSpecialPointer(metapg);
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pageop->btpo_flags = BTP_META;
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/*
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* Set pd_lower just past the end of the metadata. This is essential,
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* because without doing so, metadata will be lost if xlog.c compresses
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* the page.
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*/
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((PageHeader) metapg)->pd_lower =
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((char *) md + sizeof(BTMetaPageData)) - (char *) metapg;
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PageSetLSN(metapg, lsn);
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MarkBufferDirty(metabuf);
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UnlockReleaseBuffer(metabuf);
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}
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/*
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* _bt_clear_incomplete_split -- clear INCOMPLETE_SPLIT flag on a page
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*
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* This is a common subroutine of the redo functions of all the WAL record
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* types that can insert a downlink: insert, split, and newroot.
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*/
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static void
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_bt_clear_incomplete_split(XLogReaderState *record, uint8 block_id)
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{
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XLogRecPtr lsn = record->EndRecPtr;
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Buffer buf;
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if (XLogReadBufferForRedo(record, block_id, &buf) == BLK_NEEDS_REDO)
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{
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Page page = (Page) BufferGetPage(buf);
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BTPageOpaque pageop = (BTPageOpaque) PageGetSpecialPointer(page);
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Assert(P_INCOMPLETE_SPLIT(pageop));
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pageop->btpo_flags &= ~BTP_INCOMPLETE_SPLIT;
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PageSetLSN(page, lsn);
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MarkBufferDirty(buf);
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}
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if (BufferIsValid(buf))
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UnlockReleaseBuffer(buf);
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}
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static void
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btree_xlog_insert(bool isleaf, bool ismeta, bool posting,
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XLogReaderState *record)
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{
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XLogRecPtr lsn = record->EndRecPtr;
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xl_btree_insert *xlrec = (xl_btree_insert *) XLogRecGetData(record);
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Buffer buffer;
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Page page;
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/*
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* Insertion to an internal page finishes an incomplete split at the child
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* level. Clear the incomplete-split flag in the child. Note: during
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* normal operation, the child and parent pages are locked at the same
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* time, so that clearing the flag and inserting the downlink appear
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* atomic to other backends. We don't bother with that during replay,
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* because readers don't care about the incomplete-split flag and there
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* cannot be updates happening.
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*/
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if (!isleaf)
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_bt_clear_incomplete_split(record, 1);
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if (XLogReadBufferForRedo(record, 0, &buffer) == BLK_NEEDS_REDO)
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{
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Size datalen;
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char *datapos = XLogRecGetBlockData(record, 0, &datalen);
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page = BufferGetPage(buffer);
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if (!posting)
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{
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/* Simple retail insertion */
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if (PageAddItem(page, (Item) datapos, datalen, xlrec->offnum,
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false, false) == InvalidOffsetNumber)
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elog(PANIC, "failed to add new item");
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}
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else
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{
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ItemId itemid;
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IndexTuple oposting,
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newitem,
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nposting;
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uint16 postingoff;
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/*
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* A posting list split occurred during leaf page insertion. WAL
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* record data will start with an offset number representing the
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* point in an existing posting list that a split occurs at.
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*
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* Use _bt_swap_posting() to repeat posting list split steps from
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* primary. Note that newitem from WAL record is 'orignewitem',
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* not the final version of newitem that is actually inserted on
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* page.
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*/
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postingoff = *((uint16 *) datapos);
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datapos += sizeof(uint16);
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datalen -= sizeof(uint16);
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itemid = PageGetItemId(page, OffsetNumberPrev(xlrec->offnum));
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oposting = (IndexTuple) PageGetItem(page, itemid);
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/* Use mutable, aligned newitem copy in _bt_swap_posting() */
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Assert(isleaf && postingoff > 0);
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newitem = CopyIndexTuple((IndexTuple) datapos);
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nposting = _bt_swap_posting(newitem, oposting, postingoff);
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/* Replace existing posting list with post-split version */
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memcpy(oposting, nposting, MAXALIGN(IndexTupleSize(nposting)));
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/* Insert "final" new item (not orignewitem from WAL stream) */
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Assert(IndexTupleSize(newitem) == datalen);
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if (PageAddItem(page, (Item) newitem, datalen, xlrec->offnum,
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false, false) == InvalidOffsetNumber)
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elog(PANIC, "failed to add posting split new item");
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}
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PageSetLSN(page, lsn);
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MarkBufferDirty(buffer);
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}
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if (BufferIsValid(buffer))
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UnlockReleaseBuffer(buffer);
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/*
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* Note: in normal operation, we'd update the metapage while still holding
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* lock on the page we inserted into. But during replay it's not
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* necessary to hold that lock, since no other index updates can be
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* happening concurrently, and readers will cope fine with following an
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* obsolete link from the metapage.
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*/
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if (ismeta)
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_bt_restore_meta(record, 2);
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}
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static void
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btree_xlog_split(bool onleft, XLogReaderState *record)
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{
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XLogRecPtr lsn = record->EndRecPtr;
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xl_btree_split *xlrec = (xl_btree_split *) XLogRecGetData(record);
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bool isleaf = (xlrec->level == 0);
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Buffer lbuf;
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Buffer rbuf;
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Page rpage;
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BTPageOpaque ropaque;
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char *datapos;
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Size datalen;
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BlockNumber leftsib;
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BlockNumber rightsib;
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BlockNumber rnext;
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XLogRecGetBlockTag(record, 0, NULL, NULL, &leftsib);
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XLogRecGetBlockTag(record, 1, NULL, NULL, &rightsib);
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if (!XLogRecGetBlockTag(record, 2, NULL, NULL, &rnext))
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rnext = P_NONE;
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/*
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* Clear the incomplete split flag on the left sibling of the child page
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* this is a downlink for. (Like in btree_xlog_insert, this can be done
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* before locking the other pages)
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*/
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if (!isleaf)
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_bt_clear_incomplete_split(record, 3);
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/* Reconstruct right (new) sibling page from scratch */
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rbuf = XLogInitBufferForRedo(record, 1);
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datapos = XLogRecGetBlockData(record, 1, &datalen);
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rpage = (Page) BufferGetPage(rbuf);
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_bt_pageinit(rpage, BufferGetPageSize(rbuf));
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ropaque = (BTPageOpaque) PageGetSpecialPointer(rpage);
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ropaque->btpo_prev = leftsib;
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ropaque->btpo_next = rnext;
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ropaque->btpo.level = xlrec->level;
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ropaque->btpo_flags = isleaf ? BTP_LEAF : 0;
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ropaque->btpo_cycleid = 0;
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_bt_restore_page(rpage, datapos, datalen);
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PageSetLSN(rpage, lsn);
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MarkBufferDirty(rbuf);
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/* Now reconstruct left (original) sibling page */
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if (XLogReadBufferForRedo(record, 0, &lbuf) == BLK_NEEDS_REDO)
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{
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/*
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* To retain the same physical order of the tuples that they had, we
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* initialize a temporary empty page for the left page and add all the
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* items to that in item number order. This mirrors how _bt_split()
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* works. Retaining the same physical order makes WAL consistency
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* checking possible. See also _bt_restore_page(), which does the
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* same for the right page.
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*/
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Page lpage = (Page) BufferGetPage(lbuf);
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BTPageOpaque lopaque = (BTPageOpaque) PageGetSpecialPointer(lpage);
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OffsetNumber off;
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IndexTuple newitem = NULL,
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left_hikey = NULL,
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nposting = NULL;
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Size newitemsz = 0,
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left_hikeysz = 0;
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Page newlpage;
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OffsetNumber leftoff,
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replacepostingoff = InvalidOffsetNumber;
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datapos = XLogRecGetBlockData(record, 0, &datalen);
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if (onleft || xlrec->postingoff != 0)
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{
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newitem = (IndexTuple) datapos;
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newitemsz = MAXALIGN(IndexTupleSize(newitem));
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datapos += newitemsz;
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datalen -= newitemsz;
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if (xlrec->postingoff != 0)
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{
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ItemId itemid;
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IndexTuple oposting;
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/* Posting list must be at offset number before new item's */
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replacepostingoff = OffsetNumberPrev(xlrec->newitemoff);
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/* Use mutable, aligned newitem copy in _bt_swap_posting() */
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newitem = CopyIndexTuple(newitem);
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itemid = PageGetItemId(lpage, replacepostingoff);
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oposting = (IndexTuple) PageGetItem(lpage, itemid);
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nposting = _bt_swap_posting(newitem, oposting,
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xlrec->postingoff);
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}
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}
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/*
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* Extract left hikey and its size. We assume that 16-bit alignment
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* is enough to apply IndexTupleSize (since it's fetching from a
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* uint16 field).
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*/
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left_hikey = (IndexTuple) datapos;
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left_hikeysz = MAXALIGN(IndexTupleSize(left_hikey));
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datapos += left_hikeysz;
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datalen -= left_hikeysz;
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Assert(datalen == 0);
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newlpage = PageGetTempPageCopySpecial(lpage);
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/* Set high key */
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leftoff = P_HIKEY;
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if (PageAddItem(newlpage, (Item) left_hikey, left_hikeysz,
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P_HIKEY, false, false) == InvalidOffsetNumber)
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elog(PANIC, "failed to add high key to left page after split");
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leftoff = OffsetNumberNext(leftoff);
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for (off = P_FIRSTDATAKEY(lopaque); off < xlrec->firstright; off++)
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{
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ItemId itemid;
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Size itemsz;
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IndexTuple item;
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/* Add replacement posting list when required */
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if (off == replacepostingoff)
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{
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Assert(onleft || xlrec->firstright == xlrec->newitemoff);
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if (PageAddItem(newlpage, (Item) nposting,
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MAXALIGN(IndexTupleSize(nposting)), leftoff,
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false, false) == InvalidOffsetNumber)
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elog(ERROR, "failed to add new posting list item to left page after split");
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leftoff = OffsetNumberNext(leftoff);
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continue; /* don't insert oposting */
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}
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/* add the new item if it was inserted on left page */
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else if (onleft && off == xlrec->newitemoff)
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{
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if (PageAddItem(newlpage, (Item) newitem, newitemsz, leftoff,
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false, false) == InvalidOffsetNumber)
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elog(ERROR, "failed to add new item to left page after split");
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leftoff = OffsetNumberNext(leftoff);
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}
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itemid = PageGetItemId(lpage, off);
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itemsz = ItemIdGetLength(itemid);
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item = (IndexTuple) PageGetItem(lpage, itemid);
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if (PageAddItem(newlpage, (Item) item, itemsz, leftoff,
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false, false) == InvalidOffsetNumber)
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elog(ERROR, "failed to add old item to left page after split");
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leftoff = OffsetNumberNext(leftoff);
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}
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/* cope with possibility that newitem goes at the end */
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if (onleft && off == xlrec->newitemoff)
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{
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if (PageAddItem(newlpage, (Item) newitem, newitemsz, leftoff,
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false, false) == InvalidOffsetNumber)
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elog(ERROR, "failed to add new item to left page after split");
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leftoff = OffsetNumberNext(leftoff);
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}
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PageRestoreTempPage(newlpage, lpage);
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/* Fix opaque fields */
|
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lopaque->btpo_flags = BTP_INCOMPLETE_SPLIT;
|
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if (isleaf)
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lopaque->btpo_flags |= BTP_LEAF;
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lopaque->btpo_next = rightsib;
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lopaque->btpo_cycleid = 0;
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|
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PageSetLSN(lpage, lsn);
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MarkBufferDirty(lbuf);
|
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}
|
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|
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/*
|
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* We no longer need the buffers. They must be released together, so that
|
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* readers cannot observe two inconsistent halves.
|
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*/
|
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if (BufferIsValid(lbuf))
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UnlockReleaseBuffer(lbuf);
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UnlockReleaseBuffer(rbuf);
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|
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/*
|
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* Fix left-link of the page to the right of the new right sibling.
|
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*
|
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* Note: in normal operation, we do this while still holding lock on the
|
|
* two split pages. However, that's not necessary for correctness in WAL
|
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* replay, because no other index update can be in progress, and readers
|
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* will cope properly when following an obsolete left-link.
|
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*/
|
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if (rnext != P_NONE)
|
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{
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Buffer buffer;
|
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|
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if (XLogReadBufferForRedo(record, 2, &buffer) == BLK_NEEDS_REDO)
|
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{
|
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Page page = (Page) BufferGetPage(buffer);
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BTPageOpaque pageop = (BTPageOpaque) PageGetSpecialPointer(page);
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pageop->btpo_prev = rightsib;
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|
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PageSetLSN(page, lsn);
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MarkBufferDirty(buffer);
|
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}
|
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if (BufferIsValid(buffer))
|
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UnlockReleaseBuffer(buffer);
|
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}
|
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}
|
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|
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static void
|
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btree_xlog_dedup(XLogReaderState *record)
|
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{
|
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XLogRecPtr lsn = record->EndRecPtr;
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xl_btree_dedup *xlrec = (xl_btree_dedup *) XLogRecGetData(record);
|
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Buffer buf;
|
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|
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if (XLogReadBufferForRedo(record, 0, &buf) == BLK_NEEDS_REDO)
|
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{
|
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char *ptr = XLogRecGetBlockData(record, 0, NULL);
|
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Page page = (Page) BufferGetPage(buf);
|
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BTPageOpaque opaque = (BTPageOpaque) PageGetSpecialPointer(page);
|
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OffsetNumber offnum,
|
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minoff,
|
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maxoff;
|
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BTDedupState state;
|
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BTDedupInterval *intervals;
|
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Page newpage;
|
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|
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state = (BTDedupState) palloc(sizeof(BTDedupStateData));
|
|
state->deduplicate = true; /* unused */
|
|
/* Conservatively use larger maxpostingsize than primary */
|
|
state->maxpostingsize = BTMaxItemSize(page);
|
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state->base = NULL;
|
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state->baseoff = InvalidOffsetNumber;
|
|
state->basetupsize = 0;
|
|
state->htids = palloc(state->maxpostingsize);
|
|
state->nhtids = 0;
|
|
state->nitems = 0;
|
|
state->phystupsize = 0;
|
|
state->nintervals = 0;
|
|
|
|
minoff = P_FIRSTDATAKEY(opaque);
|
|
maxoff = PageGetMaxOffsetNumber(page);
|
|
newpage = PageGetTempPageCopySpecial(page);
|
|
|
|
if (!P_RIGHTMOST(opaque))
|
|
{
|
|
ItemId itemid = PageGetItemId(page, P_HIKEY);
|
|
Size itemsz = ItemIdGetLength(itemid);
|
|
IndexTuple item = (IndexTuple) PageGetItem(page, itemid);
|
|
|
|
if (PageAddItem(newpage, (Item) item, itemsz, P_HIKEY,
|
|
false, false) == InvalidOffsetNumber)
|
|
elog(ERROR, "deduplication failed to add highkey");
|
|
}
|
|
|
|
intervals = (BTDedupInterval *) ptr;
|
|
for (offnum = minoff;
|
|
offnum <= maxoff;
|
|
offnum = OffsetNumberNext(offnum))
|
|
{
|
|
ItemId itemid = PageGetItemId(page, offnum);
|
|
IndexTuple itup = (IndexTuple) PageGetItem(page, itemid);
|
|
|
|
if (offnum == minoff)
|
|
_bt_dedup_start_pending(state, itup, offnum);
|
|
else if (state->nintervals < xlrec->nintervals &&
|
|
state->baseoff == intervals[state->nintervals].baseoff &&
|
|
state->nitems < intervals[state->nintervals].nitems)
|
|
{
|
|
if (!_bt_dedup_save_htid(state, itup))
|
|
elog(ERROR, "deduplication failed to add heap tid to pending posting list");
|
|
}
|
|
else
|
|
{
|
|
_bt_dedup_finish_pending(newpage, state);
|
|
_bt_dedup_start_pending(state, itup, offnum);
|
|
}
|
|
}
|
|
|
|
_bt_dedup_finish_pending(newpage, state);
|
|
Assert(state->nintervals == xlrec->nintervals);
|
|
Assert(memcmp(state->intervals, intervals,
|
|
state->nintervals * sizeof(BTDedupInterval)) == 0);
|
|
|
|
if (P_HAS_GARBAGE(opaque))
|
|
{
|
|
BTPageOpaque nopaque = (BTPageOpaque) PageGetSpecialPointer(newpage);
|
|
|
|
nopaque->btpo_flags &= ~BTP_HAS_GARBAGE;
|
|
}
|
|
|
|
PageRestoreTempPage(newpage, page);
|
|
PageSetLSN(page, lsn);
|
|
MarkBufferDirty(buf);
|
|
}
|
|
|
|
if (BufferIsValid(buf))
|
|
UnlockReleaseBuffer(buf);
|
|
}
|
|
|
|
static void
|
|
btree_xlog_vacuum(XLogReaderState *record)
|
|
{
|
|
XLogRecPtr lsn = record->EndRecPtr;
|
|
xl_btree_vacuum *xlrec = (xl_btree_vacuum *) XLogRecGetData(record);
|
|
Buffer buffer;
|
|
Page page;
|
|
BTPageOpaque opaque;
|
|
|
|
/*
|
|
* We need to take a cleanup lock here, just like btvacuumpage(). However,
|
|
* it isn't necessary to exhaustively get a cleanup lock on every block in
|
|
* the index during recovery (just getting a cleanup lock on pages with
|
|
* items to kill suffices). See nbtree/README for details.
|
|
*/
|
|
if (XLogReadBufferForRedoExtended(record, 0, RBM_NORMAL, true, &buffer)
|
|
== BLK_NEEDS_REDO)
|
|
{
|
|
char *ptr = XLogRecGetBlockData(record, 0, NULL);
|
|
|
|
page = (Page) BufferGetPage(buffer);
|
|
|
|
if (xlrec->nupdated > 0)
|
|
{
|
|
OffsetNumber *updatedoffsets;
|
|
xl_btree_update *updates;
|
|
|
|
updatedoffsets = (OffsetNumber *)
|
|
(ptr + xlrec->ndeleted * sizeof(OffsetNumber));
|
|
updates = (xl_btree_update *) ((char *) updatedoffsets +
|
|
xlrec->nupdated *
|
|
sizeof(OffsetNumber));
|
|
|
|
for (int i = 0; i < xlrec->nupdated; i++)
|
|
{
|
|
BTVacuumPosting vacposting;
|
|
IndexTuple origtuple;
|
|
ItemId itemid;
|
|
Size itemsz;
|
|
|
|
itemid = PageGetItemId(page, updatedoffsets[i]);
|
|
origtuple = (IndexTuple) PageGetItem(page, itemid);
|
|
|
|
vacposting = palloc(offsetof(BTVacuumPostingData, deletetids) +
|
|
updates->ndeletedtids * sizeof(uint16));
|
|
vacposting->updatedoffset = updatedoffsets[i];
|
|
vacposting->itup = origtuple;
|
|
vacposting->ndeletedtids = updates->ndeletedtids;
|
|
memcpy(vacposting->deletetids,
|
|
(char *) updates + SizeOfBtreeUpdate,
|
|
updates->ndeletedtids * sizeof(uint16));
|
|
|
|
_bt_update_posting(vacposting);
|
|
|
|
/* Overwrite updated version of tuple */
|
|
itemsz = MAXALIGN(IndexTupleSize(vacposting->itup));
|
|
if (!PageIndexTupleOverwrite(page, updatedoffsets[i],
|
|
(Item) vacposting->itup, itemsz))
|
|
elog(PANIC, "failed to update partially dead item");
|
|
|
|
pfree(vacposting->itup);
|
|
pfree(vacposting);
|
|
|
|
/* advance to next xl_btree_update from array */
|
|
updates = (xl_btree_update *)
|
|
((char *) updates + SizeOfBtreeUpdate +
|
|
updates->ndeletedtids * sizeof(uint16));
|
|
}
|
|
}
|
|
|
|
if (xlrec->ndeleted > 0)
|
|
PageIndexMultiDelete(page, (OffsetNumber *) ptr, xlrec->ndeleted);
|
|
|
|
/*
|
|
* Mark the page as not containing any LP_DEAD items --- see comments
|
|
* in _bt_delitems_vacuum().
|
|
*/
|
|
opaque = (BTPageOpaque) PageGetSpecialPointer(page);
|
|
opaque->btpo_flags &= ~BTP_HAS_GARBAGE;
|
|
|
|
PageSetLSN(page, lsn);
|
|
MarkBufferDirty(buffer);
|
|
}
|
|
if (BufferIsValid(buffer))
|
|
UnlockReleaseBuffer(buffer);
|
|
}
|
|
|
|
static void
|
|
btree_xlog_delete(XLogReaderState *record)
|
|
{
|
|
XLogRecPtr lsn = record->EndRecPtr;
|
|
xl_btree_delete *xlrec = (xl_btree_delete *) XLogRecGetData(record);
|
|
Buffer buffer;
|
|
Page page;
|
|
BTPageOpaque opaque;
|
|
|
|
/*
|
|
* If we have any conflict processing to do, it must happen before we
|
|
* update the page
|
|
*/
|
|
if (InHotStandby)
|
|
{
|
|
RelFileNode rnode;
|
|
|
|
XLogRecGetBlockTag(record, 0, &rnode, NULL, NULL);
|
|
|
|
ResolveRecoveryConflictWithSnapshot(xlrec->latestRemovedXid, rnode);
|
|
}
|
|
|
|
/*
|
|
* We don't need to take a cleanup lock to apply these changes. See
|
|
* nbtree/README for details.
|
|
*/
|
|
if (XLogReadBufferForRedo(record, 0, &buffer) == BLK_NEEDS_REDO)
|
|
{
|
|
char *ptr = XLogRecGetBlockData(record, 0, NULL);
|
|
|
|
page = (Page) BufferGetPage(buffer);
|
|
|
|
PageIndexMultiDelete(page, (OffsetNumber *) ptr, xlrec->ndeleted);
|
|
|
|
/* Mark the page as not containing any LP_DEAD items */
|
|
opaque = (BTPageOpaque) PageGetSpecialPointer(page);
|
|
opaque->btpo_flags &= ~BTP_HAS_GARBAGE;
|
|
|
|
PageSetLSN(page, lsn);
|
|
MarkBufferDirty(buffer);
|
|
}
|
|
if (BufferIsValid(buffer))
|
|
UnlockReleaseBuffer(buffer);
|
|
}
|
|
|
|
static void
|
|
btree_xlog_mark_page_halfdead(uint8 info, XLogReaderState *record)
|
|
{
|
|
XLogRecPtr lsn = record->EndRecPtr;
|
|
xl_btree_mark_page_halfdead *xlrec = (xl_btree_mark_page_halfdead *) XLogRecGetData(record);
|
|
Buffer buffer;
|
|
Page page;
|
|
BTPageOpaque pageop;
|
|
IndexTupleData trunctuple;
|
|
|
|
/*
|
|
* In normal operation, we would lock all the pages this WAL record
|
|
* touches before changing any of them. In WAL replay, it should be okay
|
|
* to lock just one page at a time, since no concurrent index updates can
|
|
* be happening, and readers should not care whether they arrive at the
|
|
* target page or not (since it's surely empty).
|
|
*/
|
|
|
|
/* parent page */
|
|
if (XLogReadBufferForRedo(record, 1, &buffer) == BLK_NEEDS_REDO)
|
|
{
|
|
OffsetNumber poffset;
|
|
ItemId itemid;
|
|
IndexTuple itup;
|
|
OffsetNumber nextoffset;
|
|
BlockNumber rightsib;
|
|
|
|
page = (Page) BufferGetPage(buffer);
|
|
pageop = (BTPageOpaque) PageGetSpecialPointer(page);
|
|
|
|
poffset = xlrec->poffset;
|
|
|
|
nextoffset = OffsetNumberNext(poffset);
|
|
itemid = PageGetItemId(page, nextoffset);
|
|
itup = (IndexTuple) PageGetItem(page, itemid);
|
|
rightsib = BTreeTupleGetDownLink(itup);
|
|
|
|
itemid = PageGetItemId(page, poffset);
|
|
itup = (IndexTuple) PageGetItem(page, itemid);
|
|
BTreeTupleSetDownLink(itup, rightsib);
|
|
nextoffset = OffsetNumberNext(poffset);
|
|
PageIndexTupleDelete(page, nextoffset);
|
|
|
|
PageSetLSN(page, lsn);
|
|
MarkBufferDirty(buffer);
|
|
}
|
|
if (BufferIsValid(buffer))
|
|
UnlockReleaseBuffer(buffer);
|
|
|
|
/* Rewrite the leaf page as a halfdead page */
|
|
buffer = XLogInitBufferForRedo(record, 0);
|
|
page = (Page) BufferGetPage(buffer);
|
|
|
|
_bt_pageinit(page, BufferGetPageSize(buffer));
|
|
pageop = (BTPageOpaque) PageGetSpecialPointer(page);
|
|
|
|
pageop->btpo_prev = xlrec->leftblk;
|
|
pageop->btpo_next = xlrec->rightblk;
|
|
pageop->btpo.level = 0;
|
|
pageop->btpo_flags = BTP_HALF_DEAD | BTP_LEAF;
|
|
pageop->btpo_cycleid = 0;
|
|
|
|
/*
|
|
* Construct a dummy hikey item that points to the next parent to be
|
|
* deleted (if any).
|
|
*/
|
|
MemSet(&trunctuple, 0, sizeof(IndexTupleData));
|
|
trunctuple.t_info = sizeof(IndexTupleData);
|
|
BTreeTupleSetTopParent(&trunctuple, xlrec->topparent);
|
|
|
|
if (PageAddItem(page, (Item) &trunctuple, sizeof(IndexTupleData), P_HIKEY,
|
|
false, false) == InvalidOffsetNumber)
|
|
elog(ERROR, "could not add dummy high key to half-dead page");
|
|
|
|
PageSetLSN(page, lsn);
|
|
MarkBufferDirty(buffer);
|
|
UnlockReleaseBuffer(buffer);
|
|
}
|
|
|
|
|
|
static void
|
|
btree_xlog_unlink_page(uint8 info, XLogReaderState *record)
|
|
{
|
|
XLogRecPtr lsn = record->EndRecPtr;
|
|
xl_btree_unlink_page *xlrec = (xl_btree_unlink_page *) XLogRecGetData(record);
|
|
BlockNumber leftsib;
|
|
BlockNumber rightsib;
|
|
Buffer buffer;
|
|
Page page;
|
|
BTPageOpaque pageop;
|
|
|
|
leftsib = xlrec->leftsib;
|
|
rightsib = xlrec->rightsib;
|
|
|
|
/*
|
|
* In normal operation, we would lock all the pages this WAL record
|
|
* touches before changing any of them. In WAL replay, it should be okay
|
|
* to lock just one page at a time, since no concurrent index updates can
|
|
* be happening, and readers should not care whether they arrive at the
|
|
* target page or not (since it's surely empty).
|
|
*/
|
|
|
|
/* Fix left-link of right sibling */
|
|
if (XLogReadBufferForRedo(record, 2, &buffer) == BLK_NEEDS_REDO)
|
|
{
|
|
page = (Page) BufferGetPage(buffer);
|
|
pageop = (BTPageOpaque) PageGetSpecialPointer(page);
|
|
pageop->btpo_prev = leftsib;
|
|
|
|
PageSetLSN(page, lsn);
|
|
MarkBufferDirty(buffer);
|
|
}
|
|
if (BufferIsValid(buffer))
|
|
UnlockReleaseBuffer(buffer);
|
|
|
|
/* Fix right-link of left sibling, if any */
|
|
if (leftsib != P_NONE)
|
|
{
|
|
if (XLogReadBufferForRedo(record, 1, &buffer) == BLK_NEEDS_REDO)
|
|
{
|
|
page = (Page) BufferGetPage(buffer);
|
|
pageop = (BTPageOpaque) PageGetSpecialPointer(page);
|
|
pageop->btpo_next = rightsib;
|
|
|
|
PageSetLSN(page, lsn);
|
|
MarkBufferDirty(buffer);
|
|
}
|
|
if (BufferIsValid(buffer))
|
|
UnlockReleaseBuffer(buffer);
|
|
}
|
|
|
|
/* Rewrite target page as empty deleted page */
|
|
buffer = XLogInitBufferForRedo(record, 0);
|
|
page = (Page) BufferGetPage(buffer);
|
|
|
|
_bt_pageinit(page, BufferGetPageSize(buffer));
|
|
pageop = (BTPageOpaque) PageGetSpecialPointer(page);
|
|
|
|
pageop->btpo_prev = leftsib;
|
|
pageop->btpo_next = rightsib;
|
|
pageop->btpo.xact = xlrec->btpo_xact;
|
|
pageop->btpo_flags = BTP_DELETED;
|
|
pageop->btpo_cycleid = 0;
|
|
|
|
PageSetLSN(page, lsn);
|
|
MarkBufferDirty(buffer);
|
|
UnlockReleaseBuffer(buffer);
|
|
|
|
/*
|
|
* If we deleted a parent of the targeted leaf page, instead of the leaf
|
|
* itself, update the leaf to point to the next remaining child in the
|
|
* branch.
|
|
*/
|
|
if (XLogRecHasBlockRef(record, 3))
|
|
{
|
|
/*
|
|
* There is no real data on the page, so we just re-create it from
|
|
* scratch using the information from the WAL record.
|
|
*/
|
|
IndexTupleData trunctuple;
|
|
|
|
buffer = XLogInitBufferForRedo(record, 3);
|
|
page = (Page) BufferGetPage(buffer);
|
|
|
|
_bt_pageinit(page, BufferGetPageSize(buffer));
|
|
pageop = (BTPageOpaque) PageGetSpecialPointer(page);
|
|
|
|
pageop->btpo_flags = BTP_HALF_DEAD | BTP_LEAF;
|
|
pageop->btpo_prev = xlrec->leafleftsib;
|
|
pageop->btpo_next = xlrec->leafrightsib;
|
|
pageop->btpo.level = 0;
|
|
pageop->btpo_cycleid = 0;
|
|
|
|
/* Add a dummy hikey item */
|
|
MemSet(&trunctuple, 0, sizeof(IndexTupleData));
|
|
trunctuple.t_info = sizeof(IndexTupleData);
|
|
BTreeTupleSetTopParent(&trunctuple, xlrec->topparent);
|
|
|
|
if (PageAddItem(page, (Item) &trunctuple, sizeof(IndexTupleData), P_HIKEY,
|
|
false, false) == InvalidOffsetNumber)
|
|
elog(ERROR, "could not add dummy high key to half-dead page");
|
|
|
|
PageSetLSN(page, lsn);
|
|
MarkBufferDirty(buffer);
|
|
UnlockReleaseBuffer(buffer);
|
|
}
|
|
|
|
/* Update metapage if needed */
|
|
if (info == XLOG_BTREE_UNLINK_PAGE_META)
|
|
_bt_restore_meta(record, 4);
|
|
}
|
|
|
|
static void
|
|
btree_xlog_newroot(XLogReaderState *record)
|
|
{
|
|
XLogRecPtr lsn = record->EndRecPtr;
|
|
xl_btree_newroot *xlrec = (xl_btree_newroot *) XLogRecGetData(record);
|
|
Buffer buffer;
|
|
Page page;
|
|
BTPageOpaque pageop;
|
|
char *ptr;
|
|
Size len;
|
|
|
|
buffer = XLogInitBufferForRedo(record, 0);
|
|
page = (Page) BufferGetPage(buffer);
|
|
|
|
_bt_pageinit(page, BufferGetPageSize(buffer));
|
|
pageop = (BTPageOpaque) PageGetSpecialPointer(page);
|
|
|
|
pageop->btpo_flags = BTP_ROOT;
|
|
pageop->btpo_prev = pageop->btpo_next = P_NONE;
|
|
pageop->btpo.level = xlrec->level;
|
|
if (xlrec->level == 0)
|
|
pageop->btpo_flags |= BTP_LEAF;
|
|
pageop->btpo_cycleid = 0;
|
|
|
|
if (xlrec->level > 0)
|
|
{
|
|
ptr = XLogRecGetBlockData(record, 0, &len);
|
|
_bt_restore_page(page, ptr, len);
|
|
|
|
/* Clear the incomplete-split flag in left child */
|
|
_bt_clear_incomplete_split(record, 1);
|
|
}
|
|
|
|
PageSetLSN(page, lsn);
|
|
MarkBufferDirty(buffer);
|
|
UnlockReleaseBuffer(buffer);
|
|
|
|
_bt_restore_meta(record, 2);
|
|
}
|
|
|
|
static void
|
|
btree_xlog_reuse_page(XLogReaderState *record)
|
|
{
|
|
xl_btree_reuse_page *xlrec = (xl_btree_reuse_page *) XLogRecGetData(record);
|
|
|
|
/*
|
|
* Btree reuse_page records exist to provide a conflict point when we
|
|
* reuse pages in the index via the FSM. That's all they do though.
|
|
*
|
|
* latestRemovedXid was the page's btpo.xact. The btpo.xact <
|
|
* RecentGlobalXmin test in _bt_page_recyclable() conceptually mirrors the
|
|
* pgxact->xmin > limitXmin test in GetConflictingVirtualXIDs().
|
|
* Consequently, one XID value achieves the same exclusion effect on
|
|
* master and standby.
|
|
*/
|
|
if (InHotStandby)
|
|
{
|
|
ResolveRecoveryConflictWithSnapshot(xlrec->latestRemovedXid,
|
|
xlrec->node);
|
|
}
|
|
}
|
|
|
|
void
|
|
btree_redo(XLogReaderState *record)
|
|
{
|
|
uint8 info = XLogRecGetInfo(record) & ~XLR_INFO_MASK;
|
|
MemoryContext oldCtx;
|
|
|
|
oldCtx = MemoryContextSwitchTo(opCtx);
|
|
switch (info)
|
|
{
|
|
case XLOG_BTREE_INSERT_LEAF:
|
|
btree_xlog_insert(true, false, false, record);
|
|
break;
|
|
case XLOG_BTREE_INSERT_UPPER:
|
|
btree_xlog_insert(false, false, false, record);
|
|
break;
|
|
case XLOG_BTREE_INSERT_META:
|
|
btree_xlog_insert(false, true, false, record);
|
|
break;
|
|
case XLOG_BTREE_SPLIT_L:
|
|
btree_xlog_split(true, record);
|
|
break;
|
|
case XLOG_BTREE_SPLIT_R:
|
|
btree_xlog_split(false, record);
|
|
break;
|
|
case XLOG_BTREE_INSERT_POST:
|
|
btree_xlog_insert(true, false, true, record);
|
|
break;
|
|
case XLOG_BTREE_DEDUP:
|
|
btree_xlog_dedup(record);
|
|
break;
|
|
case XLOG_BTREE_VACUUM:
|
|
btree_xlog_vacuum(record);
|
|
break;
|
|
case XLOG_BTREE_DELETE:
|
|
btree_xlog_delete(record);
|
|
break;
|
|
case XLOG_BTREE_MARK_PAGE_HALFDEAD:
|
|
btree_xlog_mark_page_halfdead(info, record);
|
|
break;
|
|
case XLOG_BTREE_UNLINK_PAGE:
|
|
case XLOG_BTREE_UNLINK_PAGE_META:
|
|
btree_xlog_unlink_page(info, record);
|
|
break;
|
|
case XLOG_BTREE_NEWROOT:
|
|
btree_xlog_newroot(record);
|
|
break;
|
|
case XLOG_BTREE_REUSE_PAGE:
|
|
btree_xlog_reuse_page(record);
|
|
break;
|
|
case XLOG_BTREE_META_CLEANUP:
|
|
_bt_restore_meta(record, 0);
|
|
break;
|
|
default:
|
|
elog(PANIC, "btree_redo: unknown op code %u", info);
|
|
}
|
|
MemoryContextSwitchTo(oldCtx);
|
|
MemoryContextReset(opCtx);
|
|
}
|
|
|
|
void
|
|
btree_xlog_startup(void)
|
|
{
|
|
opCtx = AllocSetContextCreate(CurrentMemoryContext,
|
|
"Btree recovery temporary context",
|
|
ALLOCSET_DEFAULT_SIZES);
|
|
}
|
|
|
|
void
|
|
btree_xlog_cleanup(void)
|
|
{
|
|
MemoryContextDelete(opCtx);
|
|
opCtx = NULL;
|
|
}
|
|
|
|
/*
|
|
* Mask a btree page before performing consistency checks on it.
|
|
*/
|
|
void
|
|
btree_mask(char *pagedata, BlockNumber blkno)
|
|
{
|
|
Page page = (Page) pagedata;
|
|
BTPageOpaque maskopaq;
|
|
|
|
mask_page_lsn_and_checksum(page);
|
|
|
|
mask_page_hint_bits(page);
|
|
mask_unused_space(page);
|
|
|
|
maskopaq = (BTPageOpaque) PageGetSpecialPointer(page);
|
|
|
|
if (P_ISDELETED(maskopaq))
|
|
{
|
|
/*
|
|
* Mask page content on a DELETED page since it will be re-initialized
|
|
* during replay. See btree_xlog_unlink_page() for details.
|
|
*/
|
|
mask_page_content(page);
|
|
}
|
|
else if (P_ISLEAF(maskopaq))
|
|
{
|
|
/*
|
|
* In btree leaf pages, it is possible to modify the LP_FLAGS without
|
|
* emitting any WAL record. Hence, mask the line pointer flags. See
|
|
* _bt_killitems(), _bt_check_unique() for details.
|
|
*/
|
|
mask_lp_flags(page);
|
|
}
|
|
|
|
/*
|
|
* BTP_HAS_GARBAGE is just an un-logged hint bit. So, mask it. See
|
|
* _bt_killitems(), _bt_check_unique() for details.
|
|
*/
|
|
maskopaq->btpo_flags &= ~BTP_HAS_GARBAGE;
|
|
|
|
/*
|
|
* During replay of a btree page split, we don't set the BTP_SPLIT_END
|
|
* flag of the right sibling and initialize the cycle_id to 0 for the same
|
|
* page. See btree_xlog_split() for details.
|
|
*/
|
|
maskopaq->btpo_flags &= ~BTP_SPLIT_END;
|
|
maskopaq->btpo_cycleid = 0;
|
|
}
|