static void gistRedoPageSplitRecord(XLogRecPtr lsn, XLogRecord *record) { gistxlogPageSplit *xldata = (gistxlogPageSplit *) XLogRecGetData(record); PageSplitRecord xlrec; Buffer buffer; Page page; int i; bool isrootsplit = false; if (BlockNumberIsValid(xldata->leftchild)) gistRedoClearFollowRight(xldata->node, lsn, xldata->leftchild); decodePageSplitRecord(&xlrec, record); /* loop around all pages */ for (i = 0; i < xlrec.data->npage; i++) { NewPage *newpage = xlrec.page + i; int flags; if (newpage->header->blkno == GIST_ROOT_BLKNO) { Assert(i == 0); isrootsplit = true; } buffer = XLogReadBuffer(xlrec.data->node, newpage->header->blkno, true); Assert(BufferIsValid(buffer)); page = (Page) BufferGetPage(buffer); /* ok, clear buffer */ if (xlrec.data->origleaf && newpage->header->blkno != GIST_ROOT_BLKNO) flags = F_LEAF; else flags = 0; GISTInitBuffer(buffer, flags); /* and fill it */ gistfillbuffer(page, newpage->itup, newpage->header->num, FirstOffsetNumber); if (newpage->header->blkno == GIST_ROOT_BLKNO) { GistPageGetOpaque(page)->rightlink = InvalidBlockNumber; GistPageGetOpaque(page)->nsn = xldata->orignsn; GistClearFollowRight(page); } else { if (i < xlrec.data->npage - 1) GistPageGetOpaque(page)->rightlink = xlrec.page[i + 1].header->blkno; else GistPageGetOpaque(page)->rightlink = xldata->origrlink; GistPageGetOpaque(page)->nsn = xldata->orignsn; if (i < xlrec.data->npage - 1 && !isrootsplit) GistMarkFollowRight(page); else GistClearFollowRight(page); } PageSetLSN(page, lsn); PageSetTLI(page, ThisTimeLineID); MarkBufferDirty(buffer); UnlockReleaseBuffer(buffer); } }
static void gistRedoPageSplitRecord(XLogReaderState *record) { XLogRecPtr lsn = record->EndRecPtr; gistxlogPageSplit *xldata = (gistxlogPageSplit *) XLogRecGetData(record); Buffer firstbuffer = InvalidBuffer; Buffer buffer; Page page; int i; bool isrootsplit = false; /* * We must hold lock on the first-listed page throughout the action, * including while updating the left child page (if any). We can unlock * remaining pages in the list as soon as they've been written, because * there is no path for concurrent queries to reach those pages without * first visiting the first-listed page. */ /* loop around all pages */ for (i = 0; i < xldata->npage; i++) { int flags; char *data; Size datalen; int num; BlockNumber blkno; IndexTuple *tuples; XLogRecGetBlockTag(record, i + 1, NULL, NULL, &blkno); if (blkno == GIST_ROOT_BLKNO) { Assert(i == 0); isrootsplit = true; } buffer = XLogInitBufferForRedo(record, i + 1); page = (Page) BufferGetPage(buffer); data = XLogRecGetBlockData(record, i + 1, &datalen); tuples = decodePageSplitRecord(data, datalen, &num); /* ok, clear buffer */ if (xldata->origleaf && blkno != GIST_ROOT_BLKNO) flags = F_LEAF; else flags = 0; GISTInitBuffer(buffer, flags); /* and fill it */ gistfillbuffer(page, tuples, num, FirstOffsetNumber); if (blkno == GIST_ROOT_BLKNO) { GistPageGetOpaque(page)->rightlink = InvalidBlockNumber; GistPageSetNSN(page, xldata->orignsn); GistClearFollowRight(page); } else { if (i < xldata->npage - 1) { BlockNumber nextblkno; XLogRecGetBlockTag(record, i + 2, NULL, NULL, &nextblkno); GistPageGetOpaque(page)->rightlink = nextblkno; } else GistPageGetOpaque(page)->rightlink = xldata->origrlink; GistPageSetNSN(page, xldata->orignsn); if (i < xldata->npage - 1 && !isrootsplit && xldata->markfollowright) GistMarkFollowRight(page); else GistClearFollowRight(page); } PageSetLSN(page, lsn); MarkBufferDirty(buffer); if (i == 0) firstbuffer = buffer; else UnlockReleaseBuffer(buffer); } /* Fix follow-right data on left child page, if any */ if (XLogRecHasBlockRef(record, 0)) gistRedoClearFollowRight(record, 0); /* Finally, release lock on the first page */ UnlockReleaseBuffer(firstbuffer); }
static void gistRedoPageSplitRecord(XLogRecPtr lsn, XLogRecord *record) { gistxlogPageSplit *xldata = (gistxlogPageSplit *) XLogRecGetData(record); PageSplitRecord xlrec; Buffer firstbuffer = InvalidBuffer; Buffer buffer; Page page; int i; bool isrootsplit = false; decodePageSplitRecord(&xlrec, record); /* * We must hold lock on the first-listed page throughout the action, * including while updating the left child page (if any). We can unlock * remaining pages in the list as soon as they've been written, because * there is no path for concurrent queries to reach those pages without * first visiting the first-listed page. */ /* loop around all pages */ for (i = 0; i < xlrec.data->npage; i++) { NewPage *newpage = xlrec.page + i; int flags; if (newpage->header->blkno == GIST_ROOT_BLKNO) { Assert(i == 0); isrootsplit = true; } buffer = XLogReadBuffer(xlrec.data->node, newpage->header->blkno, true); Assert(BufferIsValid(buffer)); page = (Page) BufferGetPage(buffer); /* ok, clear buffer */ if (xlrec.data->origleaf && newpage->header->blkno != GIST_ROOT_BLKNO) flags = F_LEAF; else flags = 0; GISTInitBuffer(buffer, flags); /* and fill it */ gistfillbuffer(page, newpage->itup, newpage->header->num, FirstOffsetNumber); if (newpage->header->blkno == GIST_ROOT_BLKNO) { GistPageGetOpaque(page)->rightlink = InvalidBlockNumber; GistPageSetNSN(page, xldata->orignsn); GistClearFollowRight(page); } else { if (i < xlrec.data->npage - 1) GistPageGetOpaque(page)->rightlink = xlrec.page[i + 1].header->blkno; else GistPageGetOpaque(page)->rightlink = xldata->origrlink; GistPageSetNSN(page, xldata->orignsn); if (i < xlrec.data->npage - 1 && !isrootsplit && xldata->markfollowright) GistMarkFollowRight(page); else GistClearFollowRight(page); } PageSetLSN(page, lsn); MarkBufferDirty(buffer); if (i == 0) firstbuffer = buffer; else UnlockReleaseBuffer(buffer); } /* Fix follow-right data on left child page, if any */ if (BlockNumberIsValid(xldata->leftchild)) gistRedoClearFollowRight(lsn, record, 0, xldata->node, xldata->leftchild); /* Finally, release lock on the first page */ UnlockReleaseBuffer(firstbuffer); }