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Getting from get_raw_page() an all-zero page is considered as a valid case by the buffer manager and it can happen for example when finding a corrupted page with zero_damaged_pages enabled (using zero_damaged_pages to look at corrupted pages happens), or after a crash when a relation file is extended before any WAL for its new data is generated (before a vacuum or autovacuum job comes in to do some cleanup). However, all the functions of pageinspect, as of the index AMs (except hash that has its own idea of new pages), heap, the FSM or the page header have never worked with all-zero pages, causing various crashes when going through the page internals. This commit changes all the pageinspect functions to be compliant with all-zero pages, where the choice is made to return NULL or no rows for SRFs when finding a new page. get_raw_page() still works the same way, returning a batch of zeros in the bytea of the page retrieved. A hard error could be used but NULL, while more invasive, is useful when scanning relation files in full to get a batch of results for a single relation in one query. Tests are added for all the code paths impacted. Reported-by: Daria Lepikhova Author: Michael Paquier Discussion: https://postgr.es/m/561e187b-3549-c8d5-03f5-525c14e65bd0@postgrespro.ru Backpatch-through: 10
295 lines
8.2 KiB
C
295 lines
8.2 KiB
C
/*
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* ginfuncs.c
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* Functions to investigate the content of GIN indexes
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*
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* Copyright (c) 2014-2022, PostgreSQL Global Development Group
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*
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* IDENTIFICATION
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* contrib/pageinspect/ginfuncs.c
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*/
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#include "postgres.h"
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#include "access/gin.h"
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#include "access/gin_private.h"
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#include "access/htup_details.h"
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#include "catalog/namespace.h"
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#include "catalog/pg_type.h"
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#include "funcapi.h"
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#include "miscadmin.h"
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#include "pageinspect.h"
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#include "utils/array.h"
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#include "utils/builtins.h"
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#include "utils/rel.h"
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#define DatumGetItemPointer(X) ((ItemPointer) DatumGetPointer(X))
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#define ItemPointerGetDatum(X) PointerGetDatum(X)
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PG_FUNCTION_INFO_V1(gin_metapage_info);
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PG_FUNCTION_INFO_V1(gin_page_opaque_info);
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PG_FUNCTION_INFO_V1(gin_leafpage_items);
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Datum
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gin_metapage_info(PG_FUNCTION_ARGS)
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{
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bytea *raw_page = PG_GETARG_BYTEA_P(0);
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TupleDesc tupdesc;
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Page page;
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GinPageOpaque opaq;
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GinMetaPageData *metadata;
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HeapTuple resultTuple;
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Datum values[10];
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bool nulls[10];
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if (!superuser())
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ereport(ERROR,
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(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
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errmsg("must be superuser to use raw page functions")));
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page = get_page_from_raw(raw_page);
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if (PageIsNew(page))
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PG_RETURN_NULL();
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if (PageGetSpecialSize(page) != MAXALIGN(sizeof(GinPageOpaqueData)))
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("input page is not a valid GIN metapage"),
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errdetail("Expected special size %d, got %d.",
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(int) MAXALIGN(sizeof(GinPageOpaqueData)),
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(int) PageGetSpecialSize(page))));
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opaq = GinPageGetOpaque(page);
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if (opaq->flags != GIN_META)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("input page is not a GIN metapage"),
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errdetail("Flags %04X, expected %04X",
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opaq->flags, GIN_META)));
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/* Build a tuple descriptor for our result type */
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if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
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elog(ERROR, "return type must be a row type");
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metadata = GinPageGetMeta(page);
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memset(nulls, 0, sizeof(nulls));
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values[0] = Int64GetDatum(metadata->head);
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values[1] = Int64GetDatum(metadata->tail);
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values[2] = Int32GetDatum(metadata->tailFreeSize);
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values[3] = Int64GetDatum(metadata->nPendingPages);
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values[4] = Int64GetDatum(metadata->nPendingHeapTuples);
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/* statistics, updated by VACUUM */
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values[5] = Int64GetDatum(metadata->nTotalPages);
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values[6] = Int64GetDatum(metadata->nEntryPages);
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values[7] = Int64GetDatum(metadata->nDataPages);
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values[8] = Int64GetDatum(metadata->nEntries);
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values[9] = Int32GetDatum(metadata->ginVersion);
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/* Build and return the result tuple. */
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resultTuple = heap_form_tuple(tupdesc, values, nulls);
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return HeapTupleGetDatum(resultTuple);
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}
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Datum
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gin_page_opaque_info(PG_FUNCTION_ARGS)
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{
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bytea *raw_page = PG_GETARG_BYTEA_P(0);
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TupleDesc tupdesc;
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Page page;
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GinPageOpaque opaq;
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HeapTuple resultTuple;
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Datum values[3];
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bool nulls[3];
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Datum flags[16];
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int nflags = 0;
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uint16 flagbits;
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if (!superuser())
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ereport(ERROR,
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(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
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errmsg("must be superuser to use raw page functions")));
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page = get_page_from_raw(raw_page);
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if (PageIsNew(page))
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PG_RETURN_NULL();
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if (PageGetSpecialSize(page) != MAXALIGN(sizeof(GinPageOpaqueData)))
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("input page is not a valid GIN data leaf page"),
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errdetail("Expected special size %d, got %d.",
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(int) MAXALIGN(sizeof(GinPageOpaqueData)),
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(int) PageGetSpecialSize(page))));
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opaq = GinPageGetOpaque(page);
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/* Build a tuple descriptor for our result type */
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if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
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elog(ERROR, "return type must be a row type");
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/* Convert the flags bitmask to an array of human-readable names */
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flagbits = opaq->flags;
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if (flagbits & GIN_DATA)
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flags[nflags++] = CStringGetTextDatum("data");
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if (flagbits & GIN_LEAF)
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flags[nflags++] = CStringGetTextDatum("leaf");
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if (flagbits & GIN_DELETED)
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flags[nflags++] = CStringGetTextDatum("deleted");
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if (flagbits & GIN_META)
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flags[nflags++] = CStringGetTextDatum("meta");
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if (flagbits & GIN_LIST)
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flags[nflags++] = CStringGetTextDatum("list");
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if (flagbits & GIN_LIST_FULLROW)
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flags[nflags++] = CStringGetTextDatum("list_fullrow");
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if (flagbits & GIN_INCOMPLETE_SPLIT)
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flags[nflags++] = CStringGetTextDatum("incomplete_split");
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if (flagbits & GIN_COMPRESSED)
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flags[nflags++] = CStringGetTextDatum("compressed");
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flagbits &= ~(GIN_DATA | GIN_LEAF | GIN_DELETED | GIN_META | GIN_LIST |
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GIN_LIST_FULLROW | GIN_INCOMPLETE_SPLIT | GIN_COMPRESSED);
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if (flagbits)
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{
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/* any flags we don't recognize are printed in hex */
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flags[nflags++] = DirectFunctionCall1(to_hex32, Int32GetDatum(flagbits));
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}
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memset(nulls, 0, sizeof(nulls));
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values[0] = Int64GetDatum(opaq->rightlink);
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values[1] = Int32GetDatum(opaq->maxoff);
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values[2] = PointerGetDatum(construct_array(flags, nflags,
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TEXTOID,
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-1, false, TYPALIGN_INT));
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/* Build and return the result tuple. */
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resultTuple = heap_form_tuple(tupdesc, values, nulls);
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return HeapTupleGetDatum(resultTuple);
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}
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typedef struct gin_leafpage_items_state
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{
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TupleDesc tupd;
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GinPostingList *seg;
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GinPostingList *lastseg;
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} gin_leafpage_items_state;
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Datum
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gin_leafpage_items(PG_FUNCTION_ARGS)
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{
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bytea *raw_page = PG_GETARG_BYTEA_P(0);
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FuncCallContext *fctx;
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gin_leafpage_items_state *inter_call_data;
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if (!superuser())
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ereport(ERROR,
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(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
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errmsg("must be superuser to use raw page functions")));
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if (SRF_IS_FIRSTCALL())
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{
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TupleDesc tupdesc;
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MemoryContext mctx;
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Page page;
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GinPageOpaque opaq;
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fctx = SRF_FIRSTCALL_INIT();
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mctx = MemoryContextSwitchTo(fctx->multi_call_memory_ctx);
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page = get_page_from_raw(raw_page);
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if (PageIsNew(page))
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{
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MemoryContextSwitchTo(mctx);
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PG_RETURN_NULL();
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}
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if (PageGetSpecialSize(page) != MAXALIGN(sizeof(GinPageOpaqueData)))
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("input page is not a valid GIN data leaf page"),
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errdetail("Expected special size %d, got %d.",
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(int) MAXALIGN(sizeof(GinPageOpaqueData)),
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(int) PageGetSpecialSize(page))));
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opaq = GinPageGetOpaque(page);
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if (opaq->flags != (GIN_DATA | GIN_LEAF | GIN_COMPRESSED))
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("input page is not a compressed GIN data leaf page"),
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errdetail("Flags %04X, expected %04X",
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opaq->flags,
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(GIN_DATA | GIN_LEAF | GIN_COMPRESSED))));
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inter_call_data = palloc(sizeof(gin_leafpage_items_state));
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/* Build a tuple descriptor for our result type */
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if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
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elog(ERROR, "return type must be a row type");
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inter_call_data->tupd = tupdesc;
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inter_call_data->seg = GinDataLeafPageGetPostingList(page);
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inter_call_data->lastseg = (GinPostingList *)
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(((char *) inter_call_data->seg) +
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GinDataLeafPageGetPostingListSize(page));
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fctx->user_fctx = inter_call_data;
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MemoryContextSwitchTo(mctx);
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}
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fctx = SRF_PERCALL_SETUP();
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inter_call_data = fctx->user_fctx;
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if (inter_call_data->seg != inter_call_data->lastseg)
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{
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GinPostingList *cur = inter_call_data->seg;
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HeapTuple resultTuple;
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Datum result;
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Datum values[3];
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bool nulls[3];
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int ndecoded,
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i;
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ItemPointer tids;
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Datum *tids_datum;
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memset(nulls, 0, sizeof(nulls));
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values[0] = ItemPointerGetDatum(&cur->first);
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values[1] = UInt16GetDatum(cur->nbytes);
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/* build an array of decoded item pointers */
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tids = ginPostingListDecode(cur, &ndecoded);
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tids_datum = (Datum *) palloc(ndecoded * sizeof(Datum));
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for (i = 0; i < ndecoded; i++)
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tids_datum[i] = ItemPointerGetDatum(&tids[i]);
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values[2] = PointerGetDatum(construct_array(tids_datum,
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ndecoded,
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TIDOID,
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sizeof(ItemPointerData),
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false, TYPALIGN_SHORT));
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pfree(tids_datum);
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pfree(tids);
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/* Build and return the result tuple. */
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resultTuple = heap_form_tuple(inter_call_data->tupd, values, nulls);
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result = HeapTupleGetDatum(resultTuple);
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inter_call_data->seg = GinNextPostingListSegment(cur);
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SRF_RETURN_NEXT(fctx, result);
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}
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SRF_RETURN_DONE(fctx);
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}
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