TLA Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * gistxlog.c
4 : * WAL replay logic for GiST.
5 : *
6 : *
7 : * Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
8 : * Portions Copyright (c) 1994, Regents of the University of California
9 : *
10 : * IDENTIFICATION
11 : * src/backend/access/gist/gistxlog.c
12 : *-------------------------------------------------------------------------
13 : */
14 : #include "postgres.h"
15 :
16 : #include "access/bufmask.h"
17 : #include "access/gist_private.h"
18 : #include "access/gistxlog.h"
19 : #include "access/heapam_xlog.h"
20 : #include "access/transam.h"
21 : #include "access/xloginsert.h"
22 : #include "access/xlogutils.h"
23 : #include "miscadmin.h"
24 : #include "storage/procarray.h"
25 : #include "utils/memutils.h"
26 : #include "utils/rel.h"
27 :
28 : static MemoryContext opCtx; /* working memory for operations */
29 :
30 : /*
31 : * Replay the clearing of F_FOLLOW_RIGHT flag on a child page.
32 : *
33 : * Even if the WAL record includes a full-page image, we have to update the
34 : * follow-right flag, because that change is not included in the full-page
35 : * image. To be sure that the intermediate state with the wrong flag value is
36 : * not visible to concurrent Hot Standby queries, this function handles
37 : * restoring the full-page image as well as updating the flag. (Note that
38 : * we never need to do anything else to the child page in the current WAL
39 : * action.)
40 : */
41 : static void
42 CBC 443 : gistRedoClearFollowRight(XLogReaderState *record, uint8 block_id)
43 : {
44 443 : XLogRecPtr lsn = record->EndRecPtr;
45 : Buffer buffer;
46 : Page page;
47 : XLogRedoAction action;
48 :
49 : /*
50 : * Note that we still update the page even if it was restored from a full
51 : * page image, because the updated NSN is not included in the image.
52 : */
53 443 : action = XLogReadBufferForRedo(record, block_id, &buffer);
54 443 : if (action == BLK_NEEDS_REDO || action == BLK_RESTORED)
55 : {
56 443 : page = BufferGetPage(buffer);
57 :
58 443 : GistPageSetNSN(page, lsn);
59 443 : GistClearFollowRight(page);
60 :
61 443 : PageSetLSN(page, lsn);
62 443 : MarkBufferDirty(buffer);
63 : }
64 443 : if (BufferIsValid(buffer))
65 443 : UnlockReleaseBuffer(buffer);
66 443 : }
67 :
68 : /*
69 : * redo any page update (except page split)
70 : */
71 : static void
72 57037 : gistRedoPageUpdateRecord(XLogReaderState *record)
73 : {
74 57037 : XLogRecPtr lsn = record->EndRecPtr;
75 57037 : gistxlogPageUpdate *xldata = (gistxlogPageUpdate *) XLogRecGetData(record);
76 : Buffer buffer;
77 : Page page;
78 :
79 57037 : if (XLogReadBufferForRedo(record, 0, &buffer) == BLK_NEEDS_REDO)
80 : {
81 : char *begin;
82 : char *data;
83 : Size datalen;
84 57008 : int ninserted PG_USED_FOR_ASSERTS_ONLY = 0;
85 :
86 57008 : data = begin = XLogRecGetBlockData(record, 0, &datalen);
87 :
88 57008 : page = (Page) BufferGetPage(buffer);
89 :
90 57008 : if (xldata->ntodelete == 1 && xldata->ntoinsert == 1)
91 20844 : {
92 : /*
93 : * When replacing one tuple with one other tuple, we must use
94 : * PageIndexTupleOverwrite for consistency with gistplacetopage.
95 : */
96 20844 : OffsetNumber offnum = *((OffsetNumber *) data);
97 : IndexTuple itup;
98 : Size itupsize;
99 :
100 20844 : data += sizeof(OffsetNumber);
101 20844 : itup = (IndexTuple) data;
102 20844 : itupsize = IndexTupleSize(itup);
103 20844 : if (!PageIndexTupleOverwrite(page, offnum, (Item) itup, itupsize))
104 UBC 0 : elog(ERROR, "failed to add item to GiST index page, size %d bytes",
105 : (int) itupsize);
106 CBC 20844 : data += itupsize;
107 : /* should be nothing left after consuming 1 tuple */
108 20844 : Assert(data - begin == datalen);
109 : /* update insertion count for assert check below */
110 20844 : ninserted++;
111 : }
112 36164 : else if (xldata->ntodelete > 0)
113 : {
114 : /* Otherwise, delete old tuples if any */
115 472 : OffsetNumber *todelete = (OffsetNumber *) data;
116 :
117 472 : data += sizeof(OffsetNumber) * xldata->ntodelete;
118 :
119 472 : PageIndexMultiDelete(page, todelete, xldata->ntodelete);
120 472 : if (GistPageIsLeaf(page))
121 32 : GistMarkTuplesDeleted(page);
122 : }
123 :
124 : /* Add new tuples if any */
125 57008 : if (data - begin < datalen)
126 : {
127 36132 : OffsetNumber off = (PageIsEmpty(page)) ? FirstOffsetNumber :
128 36124 : OffsetNumberNext(PageGetMaxOffsetNumber(page));
129 :
130 72704 : while (data - begin < datalen)
131 : {
132 36572 : IndexTuple itup = (IndexTuple) data;
133 36572 : Size sz = IndexTupleSize(itup);
134 : OffsetNumber l;
135 :
136 36572 : data += sz;
137 :
138 36572 : l = PageAddItem(page, (Item) itup, sz, off, false, false);
139 36572 : if (l == InvalidOffsetNumber)
140 UBC 0 : elog(ERROR, "failed to add item to GiST index page, size %d bytes",
141 : (int) sz);
142 CBC 36572 : off++;
143 36572 : ninserted++;
144 : }
145 : }
146 :
147 : /* Check that XLOG record contained expected number of tuples */
148 57008 : Assert(ninserted == xldata->ntoinsert);
149 :
150 57008 : PageSetLSN(page, lsn);
151 57008 : MarkBufferDirty(buffer);
152 : }
153 :
154 : /*
155 : * Fix follow-right data on left child page
156 : *
157 : * This must be done while still holding the lock on the target page. Note
158 : * that even if the target page no longer exists, we still attempt to
159 : * replay the change on the child page.
160 : */
161 57037 : if (XLogRecHasBlockRef(record, 1))
162 441 : gistRedoClearFollowRight(record, 1);
163 :
164 57037 : if (BufferIsValid(buffer))
165 57037 : UnlockReleaseBuffer(buffer);
166 57037 : }
167 :
168 :
169 : /*
170 : * redo delete on gist index page to remove tuples marked as DEAD during index
171 : * tuple insertion
172 : */
173 : static void
174 UBC 0 : gistRedoDeleteRecord(XLogReaderState *record)
175 : {
176 0 : XLogRecPtr lsn = record->EndRecPtr;
177 0 : gistxlogDelete *xldata = (gistxlogDelete *) XLogRecGetData(record);
178 : Buffer buffer;
179 : Page page;
180 UNC 0 : OffsetNumber *toDelete = xldata->offsets;
181 EUB :
182 : /*
183 : * If we have any conflict processing to do, it must happen before we
184 : * update the page.
185 : *
186 : * GiST delete records can conflict with standby queries. You might think
187 : * that vacuum records would conflict as well, but we've handled that
188 : * already. XLOG_HEAP2_PRUNE records provide the highest xid cleaned by
189 : * the vacuum of the heap and so we can resolve any conflicts just once
190 : * when that arrives. After that we know that no conflicts exist from
191 : * individual gist vacuum records on that index.
192 : */
193 UIC 0 : if (InHotStandby)
194 EUB : {
195 : RelFileLocator rlocator;
196 :
197 UNC 0 : XLogRecGetBlockTag(record, 0, &rlocator, NULL, NULL);
198 EUB :
199 UNC 0 : ResolveRecoveryConflictWithSnapshot(xldata->snapshotConflictHorizon,
200 0 : xldata->isCatalogRel,
201 : rlocator);
202 EUB : }
203 :
204 UIC 0 : if (XLogReadBufferForRedo(record, 0, &buffer) == BLK_NEEDS_REDO)
205 : {
206 0 : page = (Page) BufferGetPage(buffer);
207 EUB :
208 UNC 0 : PageIndexMultiDelete(page, toDelete, xldata->ntodelete);
209 EUB :
210 UBC 0 : GistClearPageHasGarbage(page);
211 UIC 0 : GistMarkTuplesDeleted(page);
212 :
213 UBC 0 : PageSetLSN(page, lsn);
214 0 : MarkBufferDirty(buffer);
215 EUB : }
216 :
217 UIC 0 : if (BufferIsValid(buffer))
218 0 : UnlockReleaseBuffer(buffer);
219 0 : }
220 :
221 ECB : /*
222 : * Returns an array of index pointers.
223 : */
224 : static IndexTuple *
225 GIC 901 : decodePageSplitRecord(char *begin, int len, int *n)
226 : {
227 : char *ptr;
228 CBC 901 : int i = 0;
229 ECB : IndexTuple *tuples;
230 :
231 : /* extract the number of tuples */
232 GIC 901 : memcpy(n, begin, sizeof(int));
233 CBC 901 : ptr = begin + sizeof(int);
234 :
235 901 : tuples = palloc(*n * sizeof(IndexTuple));
236 ECB :
237 CBC 78225 : for (i = 0; i < *n; i++)
238 : {
239 77324 : Assert(ptr - begin < len);
240 GIC 77324 : tuples[i] = (IndexTuple) ptr;
241 CBC 77324 : ptr += IndexTupleSize((IndexTuple) ptr);
242 : }
243 GIC 901 : Assert(ptr - begin == len);
244 :
245 CBC 901 : return tuples;
246 : }
247 ECB :
248 : static void
249 CBC 448 : gistRedoPageSplitRecord(XLogReaderState *record)
250 : {
251 GIC 448 : XLogRecPtr lsn = record->EndRecPtr;
252 448 : gistxlogPageSplit *xldata = (gistxlogPageSplit *) XLogRecGetData(record);
253 CBC 448 : Buffer firstbuffer = InvalidBuffer;
254 : Buffer buffer;
255 : Page page;
256 : int i;
257 GIC 448 : bool isrootsplit = false;
258 :
259 : /*
260 : * We must hold lock on the first-listed page throughout the action,
261 : * including while updating the left child page (if any). We can unlock
262 : * remaining pages in the list as soon as they've been written, because
263 : * there is no path for concurrent queries to reach those pages without
264 ECB : * first visiting the first-listed page.
265 : */
266 :
267 : /* loop around all pages */
268 GIC 1349 : for (i = 0; i < xldata->npage; i++)
269 : {
270 : int flags;
271 : char *data;
272 : Size datalen;
273 ECB : int num;
274 : BlockNumber blkno;
275 : IndexTuple *tuples;
276 :
277 CBC 901 : XLogRecGetBlockTag(record, i + 1, NULL, NULL, &blkno);
278 GIC 901 : if (blkno == GIST_ROOT_BLKNO)
279 : {
280 CBC 5 : Assert(i == 0);
281 5 : isrootsplit = true;
282 ECB : }
283 :
284 CBC 901 : buffer = XLogInitBufferForRedo(record, i + 1);
285 GIC 901 : page = (Page) BufferGetPage(buffer);
286 901 : data = XLogRecGetBlockData(record, i + 1, &datalen);
287 ECB :
288 CBC 901 : tuples = decodePageSplitRecord(data, datalen, &num);
289 :
290 ECB : /* ok, clear buffer */
291 CBC 901 : if (xldata->origleaf && blkno != GIST_ROOT_BLKNO)
292 GIC 892 : flags = F_LEAF;
293 : else
294 CBC 9 : flags = 0;
295 GIC 901 : GISTInitBuffer(buffer, flags);
296 ECB :
297 : /* and fill it */
298 CBC 901 : gistfillbuffer(page, tuples, num, FirstOffsetNumber);
299 ECB :
300 CBC 901 : if (blkno == GIST_ROOT_BLKNO)
301 : {
302 GIC 5 : GistPageGetOpaque(page)->rightlink = InvalidBlockNumber;
303 5 : GistPageSetNSN(page, xldata->orignsn);
304 CBC 5 : GistClearFollowRight(page);
305 : }
306 : else
307 : {
308 896 : if (i < xldata->npage - 1)
309 ECB : {
310 : BlockNumber nextblkno;
311 :
312 CBC 448 : XLogRecGetBlockTag(record, i + 2, NULL, NULL, &nextblkno);
313 448 : GistPageGetOpaque(page)->rightlink = nextblkno;
314 ECB : }
315 : else
316 CBC 448 : GistPageGetOpaque(page)->rightlink = xldata->origrlink;
317 GIC 896 : GistPageSetNSN(page, xldata->orignsn);
318 CBC 896 : if (i < xldata->npage - 1 && !isrootsplit &&
319 GIC 443 : xldata->markfollowright)
320 443 : GistMarkFollowRight(page);
321 ECB : else
322 CBC 453 : GistClearFollowRight(page);
323 : }
324 ECB :
325 CBC 901 : PageSetLSN(page, lsn);
326 GIC 901 : MarkBufferDirty(buffer);
327 ECB :
328 GIC 901 : if (i == 0)
329 448 : firstbuffer = buffer;
330 : else
331 CBC 453 : UnlockReleaseBuffer(buffer);
332 ECB : }
333 :
334 : /* Fix follow-right data on left child page, if any */
335 CBC 448 : if (XLogRecHasBlockRef(record, 0))
336 2 : gistRedoClearFollowRight(record, 0);
337 :
338 : /* Finally, release lock on the first page */
339 GIC 448 : UnlockReleaseBuffer(firstbuffer);
340 GBC 448 : }
341 :
342 EUB : /* redo page deletion */
343 : static void
344 UIC 0 : gistRedoPageDelete(XLogReaderState *record)
345 : {
346 0 : XLogRecPtr lsn = record->EndRecPtr;
347 UBC 0 : gistxlogPageDelete *xldata = (gistxlogPageDelete *) XLogRecGetData(record);
348 : Buffer parentBuffer;
349 EUB : Buffer leafBuffer;
350 :
351 UBC 0 : if (XLogReadBufferForRedo(record, 0, &leafBuffer) == BLK_NEEDS_REDO)
352 : {
353 0 : Page page = (Page) BufferGetPage(leafBuffer);
354 EUB :
355 UIC 0 : GistPageSetDeleted(page, xldata->deleteXid);
356 :
357 UBC 0 : PageSetLSN(page, lsn);
358 UIC 0 : MarkBufferDirty(leafBuffer);
359 EUB : }
360 :
361 UBC 0 : if (XLogReadBufferForRedo(record, 1, &parentBuffer) == BLK_NEEDS_REDO)
362 : {
363 0 : Page page = (Page) BufferGetPage(parentBuffer);
364 EUB :
365 UIC 0 : PageIndexTupleDelete(page, xldata->downlinkOffset);
366 :
367 UBC 0 : PageSetLSN(page, lsn);
368 0 : MarkBufferDirty(parentBuffer);
369 EUB : }
370 :
371 UBC 0 : if (BufferIsValid(parentBuffer))
372 UIC 0 : UnlockReleaseBuffer(parentBuffer);
373 0 : if (BufferIsValid(leafBuffer))
374 UBC 0 : UnlockReleaseBuffer(leafBuffer);
375 UIC 0 : }
376 EUB :
377 : static void
378 UIC 0 : gistRedoPageReuse(XLogReaderState *record)
379 : {
380 0 : gistxlogPageReuse *xlrec = (gistxlogPageReuse *) XLogRecGetData(record);
381 :
382 : /*
383 : * PAGE_REUSE records exist to provide a conflict point when we reuse
384 : * pages in the index via the FSM. That's all they do though.
385 : *
386 : * snapshotConflictHorizon was the page's deleteXid. The
387 : * GlobalVisCheckRemovableFullXid(deleteXid) test in gistPageRecyclable()
388 EUB : * conceptually mirrors the PGPROC->xmin > limitXmin test in
389 : * GetConflictingVirtualXIDs(). Consequently, one XID value achieves the
390 : * same exclusion effect on primary and standby.
391 : */
392 UBC 0 : if (InHotStandby)
393 UNC 0 : ResolveRecoveryConflictWithSnapshotFullXid(xlrec->snapshotConflictHorizon,
394 0 : xlrec->isCatalogRel,
395 : xlrec->locator);
396 LBC 0 : }
397 :
398 ECB : void
399 GIC 57485 : gist_redo(XLogReaderState *record)
400 : {
401 57485 : uint8 info = XLogRecGetInfo(record) & ~XLR_INFO_MASK;
402 : MemoryContext oldCxt;
403 :
404 : /*
405 : * GiST indexes do not require any conflict processing. NB: If we ever
406 : * implement a similar optimization we have in b-tree, and remove killed
407 ECB : * tuples outside VACUUM, we'll need to handle that here.
408 : */
409 :
410 CBC 57485 : oldCxt = MemoryContextSwitchTo(opCtx);
411 57485 : switch (info)
412 ECB : {
413 GBC 57037 : case XLOG_GIST_PAGE_UPDATE:
414 57037 : gistRedoPageUpdateRecord(record);
415 57037 : break;
416 UBC 0 : case XLOG_GIST_DELETE:
417 0 : gistRedoDeleteRecord(record);
418 0 : break;
419 LBC 0 : case XLOG_GIST_PAGE_REUSE:
420 0 : gistRedoPageReuse(record);
421 0 : break;
422 GBC 448 : case XLOG_GIST_PAGE_SPLIT:
423 448 : gistRedoPageSplitRecord(record);
424 448 : break;
425 UBC 0 : case XLOG_GIST_PAGE_DELETE:
426 UIC 0 : gistRedoPageDelete(record);
427 UBC 0 : break;
428 0 : case XLOG_GIST_ASSIGN_LSN:
429 EUB : /* nop. See gistGetFakeLSN(). */
430 UIC 0 : break;
431 0 : default:
432 LBC 0 : elog(PANIC, "gist_redo: unknown op code %u", info);
433 ECB : }
434 :
435 GIC 57485 : MemoryContextSwitchTo(oldCxt);
436 57485 : MemoryContextReset(opCtx);
437 CBC 57485 : }
438 :
439 ECB : void
440 CBC 141 : gist_xlog_startup(void)
441 : {
442 GIC 141 : opCtx = createTempGistContext();
443 CBC 141 : }
444 :
445 ECB : void
446 CBC 108 : gist_xlog_cleanup(void)
447 : {
448 GIC 108 : MemoryContextDelete(opCtx);
449 108 : }
450 :
451 : /*
452 EUB : * Mask a Gist page before running consistency checks on it.
453 : */
454 : void
455 UIC 0 : gist_mask(char *pagedata, BlockNumber blkno)
456 EUB : {
457 UIC 0 : Page page = (Page) pagedata;
458 EUB :
459 UBC 0 : mask_page_lsn_and_checksum(page);
460 :
461 UIC 0 : mask_page_hint_bits(page);
462 0 : mask_unused_space(page);
463 :
464 : /*
465 EUB : * NSN is nothing but a special purpose LSN. Hence, mask it for the same
466 : * reason as mask_page_lsn_and_checksum.
467 : */
468 UIC 0 : GistPageSetNSN(page, (uint64) MASK_MARKER);
469 :
470 : /*
471 EUB : * We update F_FOLLOW_RIGHT flag on the left child after writing WAL
472 : * record. Hence, mask this flag. See gistplacetopage() for details.
473 : */
474 UIC 0 : GistMarkFollowRight(page);
475 :
476 0 : if (GistPageIsLeaf(page))
477 : {
478 : /*
479 : * In gist leaf pages, it is possible to modify the LP_FLAGS without
480 EUB : * emitting any WAL record. Hence, mask the line pointer flags. See
481 : * gistkillitems() for details.
482 : */
483 UIC 0 : mask_lp_flags(page);
484 : }
485 :
486 : /*
487 EUB : * During gist redo, we never mark a page as garbage. Hence, mask it to
488 : * ignore any differences.
489 : */
490 UIC 0 : GistClearPageHasGarbage(page);
491 0 : }
492 :
493 : /*
494 ECB : * Write WAL record of a page split.
495 : */
496 : XLogRecPtr
497 GIC 1730 : gistXLogSplit(bool page_is_leaf,
498 : SplitedPageLayout *dist,
499 : BlockNumber origrlink, GistNSN orignsn,
500 : Buffer leftchildbuf, bool markfollowright)
501 ECB : {
502 : gistxlogPageSplit xlrec;
503 : SplitedPageLayout *ptr;
504 GIC 1730 : int npage = 0;
505 ECB : XLogRecPtr recptr;
506 : int i;
507 :
508 CBC 5246 : for (ptr = dist; ptr; ptr = ptr->next)
509 3516 : npage++;
510 ECB :
511 CBC 1730 : xlrec.origrlink = origrlink;
512 1730 : xlrec.orignsn = orignsn;
513 GIC 1730 : xlrec.origleaf = page_is_leaf;
514 CBC 1730 : xlrec.npage = (uint16) npage;
515 GIC 1730 : xlrec.markfollowright = markfollowright;
516 :
517 1730 : XLogBeginInsert();
518 :
519 : /*
520 ECB : * Include a full page image of the child buf. (only necessary if a
521 : * checkpoint happened since the child page was split)
522 : */
523 GIC 1730 : if (BufferIsValid(leftchildbuf))
524 6 : XLogRegisterBuffer(0, leftchildbuf, REGBUF_STANDARD);
525 :
526 : /*
527 : * NOTE: We register a lot of data. The caller must've called
528 : * XLogEnsureRecordSpace() to prepare for that. We cannot do it here,
529 : * because we're already in a critical section. If you change the number
530 ECB : * of buffer or data registrations here, make sure you modify the
531 : * XLogEnsureRecordSpace() calls accordingly!
532 : */
533 CBC 1730 : XLogRegisterData((char *) &xlrec, sizeof(gistxlogPageSplit));
534 :
535 1730 : i = 1;
536 5246 : for (ptr = dist; ptr; ptr = ptr->next)
537 ECB : {
538 CBC 3516 : XLogRegisterBuffer(i, ptr->buffer, REGBUF_WILL_INIT);
539 GIC 3516 : XLogRegisterBufData(i, (char *) &(ptr->block.num), sizeof(int));
540 3516 : XLogRegisterBufData(i, (char *) ptr->list, ptr->lenlist);
541 CBC 3516 : i++;
542 : }
543 ECB :
544 GIC 1730 : recptr = XLogInsert(RM_GIST_ID, XLOG_GIST_PAGE_SPLIT);
545 :
546 1730 : return recptr;
547 : }
548 :
549 : /*
550 : * Write XLOG record describing a page deletion. This also includes removal of
551 EUB : * downlink from the parent page.
552 : */
553 : XLogRecPtr
554 UIC 0 : gistXLogPageDelete(Buffer buffer, FullTransactionId xid,
555 : Buffer parentBuffer, OffsetNumber downlinkOffset)
556 : {
557 EUB : gistxlogPageDelete xlrec;
558 : XLogRecPtr recptr;
559 :
560 UBC 0 : xlrec.deleteXid = xid;
561 0 : xlrec.downlinkOffset = downlinkOffset;
562 :
563 0 : XLogBeginInsert();
564 0 : XLogRegisterData((char *) &xlrec, SizeOfGistxlogPageDelete);
565 :
566 0 : XLogRegisterBuffer(0, buffer, REGBUF_STANDARD);
567 UIC 0 : XLogRegisterBuffer(1, parentBuffer, REGBUF_STANDARD);
568 EUB :
569 UIC 0 : recptr = XLogInsert(RM_GIST_ID, XLOG_GIST_PAGE_DELETE);
570 :
571 0 : return recptr;
572 : }
573 :
574 : /*
575 EUB : * Write an empty XLOG record to assign a distinct LSN.
576 : */
577 : XLogRecPtr
578 UIC 0 : gistXLogAssignLSN(void)
579 : {
580 0 : int dummy = 0;
581 :
582 : /*
583 EUB : * Records other than SWITCH_WAL must have content. We use an integer 0 to
584 : * follow the restriction.
585 : */
586 UBC 0 : XLogBeginInsert();
587 UIC 0 : XLogSetRecordFlags(XLOG_MARK_UNIMPORTANT);
588 0 : XLogRegisterData((char *) &dummy, sizeof(dummy));
589 0 : return XLogInsert(RM_GIST_ID, XLOG_GIST_ASSIGN_LSN);
590 : }
591 :
592 : /*
593 EUB : * Write XLOG record about reuse of a deleted page.
594 : */
595 : void
596 UNC 0 : gistXLogPageReuse(Relation rel, Relation heaprel,
597 : BlockNumber blkno, FullTransactionId deleteXid)
598 : {
599 : gistxlogPageReuse xlrec_reuse;
600 :
601 : /*
602 : * Note that we don't register the buffer with the record, because this
603 : * operation doesn't modify the page. This record only exists to provide a
604 : * conflict point for Hot Standby.
605 : */
606 EUB :
607 : /* XLOG stuff */
608 UNC 0 : xlrec_reuse.isCatalogRel = RelationIsAccessibleInLogicalDecoding(heaprel);
609 0 : xlrec_reuse.locator = rel->rd_locator;
610 UBC 0 : xlrec_reuse.block = blkno;
611 UNC 0 : xlrec_reuse.snapshotConflictHorizon = deleteXid;
612 EUB :
613 UBC 0 : XLogBeginInsert();
614 UIC 0 : XLogRegisterData((char *) &xlrec_reuse, SizeOfGistxlogPageReuse);
615 EUB :
616 UBC 0 : XLogInsert(RM_GIST_ID, XLOG_GIST_PAGE_REUSE);
617 UIC 0 : }
618 :
619 : /*
620 : * Write XLOG record describing a page update. The update can include any
621 : * number of deletions and/or insertions of tuples on a single index page.
622 : *
623 : * If this update inserts a downlink for a split page, also record that
624 : * the F_FOLLOW_RIGHT flag on the child page is cleared and NSN set.
625 : *
626 : * Note that both the todelete array and the tuples are marked as belonging
627 : * to the target buffer; they need not be stored in XLOG if XLogInsert decides
628 : * to log the whole buffer contents instead.
629 : */
630 ECB : XLogRecPtr
631 GIC 246502 : gistXLogUpdate(Buffer buffer,
632 : OffsetNumber *todelete, int ntodelete,
633 : IndexTuple *itup, int ituplen,
634 : Buffer leftchildbuf)
635 : {
636 : gistxlogPageUpdate xlrec;
637 : int i;
638 : XLogRecPtr recptr;
639 ECB :
640 CBC 246502 : xlrec.ntodelete = ntodelete;
641 GIC 246502 : xlrec.ntoinsert = ituplen;
642 ECB :
643 CBC 246502 : XLogBeginInsert();
644 GIC 246502 : XLogRegisterData((char *) &xlrec, sizeof(gistxlogPageUpdate));
645 ECB :
646 CBC 246502 : XLogRegisterBuffer(0, buffer, REGBUF_STANDARD);
647 GIC 246502 : XLogRegisterBufData(0, (char *) todelete, sizeof(OffsetNumber) * ntodelete);
648 :
649 ECB : /* new tuples */
650 CBC 494580 : for (i = 0; i < ituplen; i++)
651 GIC 248078 : XLogRegisterBufData(0, (char *) (itup[i]), IndexTupleSize(itup[i]));
652 :
653 : /*
654 : * Include a full page image of the child buf. (only necessary if a
655 : * checkpoint happened since the child page was split)
656 ECB : */
657 CBC 246502 : if (BufferIsValid(leftchildbuf))
658 GIC 1668 : XLogRegisterBuffer(1, leftchildbuf, REGBUF_STANDARD);
659 ECB :
660 GIC 246502 : recptr = XLogInsert(RM_GIST_ID, XLOG_GIST_PAGE_UPDATE);
661 ECB :
662 GIC 246502 : return recptr;
663 : }
664 :
665 : /*
666 : * Write XLOG record describing a delete of leaf index tuples marked as DEAD
667 : * during new tuple insertion. One may think that this case is already covered
668 : * by gistXLogUpdate(). But deletion of index tuples might conflict with
669 : * standby queries and needs special handling.
670 : */
671 EUB : XLogRecPtr
672 UIC 0 : gistXLogDelete(Buffer buffer, OffsetNumber *todelete, int ntodelete,
673 : TransactionId snapshotConflictHorizon, Relation heaprel)
674 : {
675 : gistxlogDelete xlrec;
676 : XLogRecPtr recptr;
677 EUB :
678 UNC 0 : xlrec.isCatalogRel = RelationIsAccessibleInLogicalDecoding(heaprel);
679 0 : xlrec.snapshotConflictHorizon = snapshotConflictHorizon;
680 UBC 0 : xlrec.ntodelete = ntodelete;
681 :
682 0 : XLogBeginInsert();
683 0 : XLogRegisterData((char *) &xlrec, SizeOfGistxlogDelete);
684 :
685 : /*
686 : * We need the target-offsets array whether or not we store the whole
687 : * buffer, to allow us to find the snapshotConflictHorizon on a standby
688 : * server.
689 : */
690 UIC 0 : XLogRegisterData((char *) todelete, ntodelete * sizeof(OffsetNumber));
691 EUB :
692 UIC 0 : XLogRegisterBuffer(0, buffer, REGBUF_STANDARD);
693 EUB :
694 UIC 0 : recptr = XLogInsert(RM_GIST_ID, XLOG_GIST_DELETE);
695 EUB :
696 UIC 0 : return recptr;
697 EUB : }
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