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Recent gcc can warn about switch-case fall throughs that are not explicitly labeled as intentional. This seems like a good thing, so clean up the warnings exposed thereby by labeling all such cases with comments that gcc will recognize. In files that already had one or more suitable comments, I generally matched the existing style of those. Otherwise I went with /* FALLTHROUGH */, which is one of the spellings approved at the more-restrictive-than-default level -Wimplicit-fallthrough=4. (At the default level you can also spell it /* FALL ?THRU */, and it's not picky about case. What you can't do is include additional text in the same comment, so some existing comments containing versions of this aren't good enough.) Testing with gcc 8.0.1 (Fedora 28's current version), I found that I also had to put explicit "break"s after elog(ERROR) or ereport(ERROR); apparently, for this purpose gcc doesn't recognize that those don't return. That seems like possibly a gcc bug, but it's fine because in most places we did that anyway; so this amounts to a visit from the style police. Discussion: https://postgr.es/m/15083.1525207729@sss.pgh.pa.us
576 lines
15 KiB
C
576 lines
15 KiB
C
/*
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* hashfuncs.c
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* Functions to investigate the content of HASH indexes
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*
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* Copyright (c) 2017-2018, PostgreSQL Global Development Group
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*
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* IDENTIFICATION
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* contrib/pageinspect/hashfuncs.c
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*/
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#include "postgres.h"
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#include "pageinspect.h"
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#include "access/hash.h"
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#include "access/htup_details.h"
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#include "catalog/pg_type.h"
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#include "catalog/pg_am.h"
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#include "funcapi.h"
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#include "miscadmin.h"
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#include "utils/builtins.h"
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#include "utils/rel.h"
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PG_FUNCTION_INFO_V1(hash_page_type);
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PG_FUNCTION_INFO_V1(hash_page_stats);
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PG_FUNCTION_INFO_V1(hash_page_items);
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PG_FUNCTION_INFO_V1(hash_bitmap_info);
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PG_FUNCTION_INFO_V1(hash_metapage_info);
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#define IS_HASH(r) ((r)->rd_rel->relam == HASH_AM_OID)
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/* ------------------------------------------------
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* structure for single hash page statistics
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* ------------------------------------------------
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*/
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typedef struct HashPageStat
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{
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int live_items;
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int dead_items;
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int page_size;
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int free_size;
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/* opaque data */
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BlockNumber hasho_prevblkno;
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BlockNumber hasho_nextblkno;
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Bucket hasho_bucket;
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uint16 hasho_flag;
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uint16 hasho_page_id;
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} HashPageStat;
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/*
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* Verify that the given bytea contains a HASH page, or die in the attempt.
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* A pointer to a palloc'd, properly aligned copy of the page is returned.
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*/
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static Page
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verify_hash_page(bytea *raw_page, int flags)
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{
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Page page = get_page_from_raw(raw_page);
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int pagetype = LH_UNUSED_PAGE;
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/* Treat new pages as unused. */
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if (!PageIsNew(page))
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{
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HashPageOpaque pageopaque;
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if (PageGetSpecialSize(page) != MAXALIGN(sizeof(HashPageOpaqueData)))
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ereport(ERROR,
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(errcode(ERRCODE_INDEX_CORRUPTED),
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errmsg("index table contains corrupted page")));
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pageopaque = (HashPageOpaque) PageGetSpecialPointer(page);
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if (pageopaque->hasho_page_id != HASHO_PAGE_ID)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("page is not a hash page"),
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errdetail("Expected %08x, got %08x.",
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HASHO_PAGE_ID, pageopaque->hasho_page_id)));
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pagetype = pageopaque->hasho_flag & LH_PAGE_TYPE;
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}
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/* Check that page type is sane. */
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if (pagetype != LH_OVERFLOW_PAGE && pagetype != LH_BUCKET_PAGE &&
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pagetype != LH_BITMAP_PAGE && pagetype != LH_META_PAGE &&
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pagetype != LH_UNUSED_PAGE)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("invalid hash page type %08x", pagetype)));
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/* If requested, verify page type. */
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if (flags != 0 && (pagetype & flags) == 0)
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{
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switch (flags)
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{
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case LH_META_PAGE:
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("page is not a hash meta page")));
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break;
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case LH_BUCKET_PAGE | LH_OVERFLOW_PAGE:
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("page is not a hash bucket or overflow page")));
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break;
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case LH_OVERFLOW_PAGE:
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("page is not a hash overflow page")));
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break;
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default:
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elog(ERROR,
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"hash page of type %08x not in mask %08x",
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pagetype, flags);
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break;
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}
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}
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/*
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* If it is the metapage, also verify magic number and version.
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*/
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if (pagetype == LH_META_PAGE)
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{
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HashMetaPage metap = HashPageGetMeta(page);
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if (metap->hashm_magic != HASH_MAGIC)
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ereport(ERROR,
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(errcode(ERRCODE_INDEX_CORRUPTED),
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errmsg("invalid magic number for metadata"),
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errdetail("Expected 0x%08x, got 0x%08x.",
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HASH_MAGIC, metap->hashm_magic)));
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if (metap->hashm_version != HASH_VERSION)
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ereport(ERROR,
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(errcode(ERRCODE_INDEX_CORRUPTED),
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errmsg("invalid version for metadata"),
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errdetail("Expected %d, got %d",
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HASH_VERSION, metap->hashm_version)));
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}
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return page;
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}
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/* -------------------------------------------------
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* GetHashPageStatistics()
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*
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* Collect statistics of single hash page
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* -------------------------------------------------
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*/
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static void
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GetHashPageStatistics(Page page, HashPageStat *stat)
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{
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OffsetNumber maxoff = PageGetMaxOffsetNumber(page);
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HashPageOpaque opaque = (HashPageOpaque) PageGetSpecialPointer(page);
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int off;
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stat->dead_items = stat->live_items = 0;
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stat->page_size = PageGetPageSize(page);
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/* hash page opaque data */
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stat->hasho_prevblkno = opaque->hasho_prevblkno;
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stat->hasho_nextblkno = opaque->hasho_nextblkno;
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stat->hasho_bucket = opaque->hasho_bucket;
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stat->hasho_flag = opaque->hasho_flag;
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stat->hasho_page_id = opaque->hasho_page_id;
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/* count live and dead tuples, and free space */
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for (off = FirstOffsetNumber; off <= maxoff; off++)
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{
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ItemId id = PageGetItemId(page, off);
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if (!ItemIdIsDead(id))
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stat->live_items++;
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else
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stat->dead_items++;
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}
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stat->free_size = PageGetFreeSpace(page);
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}
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/* ---------------------------------------------------
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* hash_page_type()
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*
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* Usage: SELECT hash_page_type(get_raw_page('con_hash_index', 1));
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* ---------------------------------------------------
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*/
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Datum
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hash_page_type(PG_FUNCTION_ARGS)
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{
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bytea *raw_page = PG_GETARG_BYTEA_P(0);
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Page page;
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HashPageOpaque opaque;
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int pagetype;
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const char *type;
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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 = verify_hash_page(raw_page, 0);
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if (PageIsNew(page))
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type = "unused";
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else
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{
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opaque = (HashPageOpaque) PageGetSpecialPointer(page);
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/* page type (flags) */
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pagetype = opaque->hasho_flag & LH_PAGE_TYPE;
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if (pagetype == LH_META_PAGE)
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type = "metapage";
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else if (pagetype == LH_OVERFLOW_PAGE)
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type = "overflow";
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else if (pagetype == LH_BUCKET_PAGE)
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type = "bucket";
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else if (pagetype == LH_BITMAP_PAGE)
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type = "bitmap";
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else
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type = "unused";
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}
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PG_RETURN_TEXT_P(cstring_to_text(type));
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}
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/* ---------------------------------------------------
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* hash_page_stats()
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*
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* Usage: SELECT * FROM hash_page_stats(get_raw_page('con_hash_index', 1));
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* ---------------------------------------------------
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*/
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Datum
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hash_page_stats(PG_FUNCTION_ARGS)
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{
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bytea *raw_page = PG_GETARG_BYTEA_P(0);
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Page page;
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int j;
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Datum values[9];
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bool nulls[9];
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HashPageStat stat;
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HeapTuple tuple;
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TupleDesc tupleDesc;
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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 = verify_hash_page(raw_page, LH_BUCKET_PAGE | LH_OVERFLOW_PAGE);
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/* keep compiler quiet */
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stat.hasho_prevblkno = stat.hasho_nextblkno = InvalidBlockNumber;
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stat.hasho_flag = stat.hasho_page_id = stat.free_size = 0;
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GetHashPageStatistics(page, &stat);
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/* Build a tuple descriptor for our result type */
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if (get_call_result_type(fcinfo, NULL, &tupleDesc) != TYPEFUNC_COMPOSITE)
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elog(ERROR, "return type must be a row type");
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tupleDesc = BlessTupleDesc(tupleDesc);
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MemSet(nulls, 0, sizeof(nulls));
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j = 0;
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values[j++] = Int32GetDatum(stat.live_items);
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values[j++] = Int32GetDatum(stat.dead_items);
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values[j++] = Int32GetDatum(stat.page_size);
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values[j++] = Int32GetDatum(stat.free_size);
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values[j++] = Int64GetDatum((int64) stat.hasho_prevblkno);
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values[j++] = Int64GetDatum((int64) stat.hasho_nextblkno);
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values[j++] = Int64GetDatum((int64) stat.hasho_bucket);
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values[j++] = Int32GetDatum((int32) stat.hasho_flag);
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values[j++] = Int32GetDatum((int32) stat.hasho_page_id);
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tuple = heap_form_tuple(tupleDesc, values, nulls);
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PG_RETURN_DATUM(HeapTupleGetDatum(tuple));
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}
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/*
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* cross-call data structure for SRF
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*/
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struct user_args
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{
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Page page;
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OffsetNumber offset;
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};
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/*-------------------------------------------------------
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* hash_page_items()
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*
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* Get IndexTupleData set in a hash page
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*
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* Usage: SELECT * FROM hash_page_items(get_raw_page('con_hash_index', 1));
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*-------------------------------------------------------
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*/
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Datum
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hash_page_items(PG_FUNCTION_ARGS)
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{
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bytea *raw_page = PG_GETARG_BYTEA_P(0);
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Page page;
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Datum result;
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Datum values[3];
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bool nulls[3];
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uint32 hashkey;
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HeapTuple tuple;
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FuncCallContext *fctx;
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MemoryContext mctx;
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struct user_args *uargs;
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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 tupleDesc;
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fctx = SRF_FIRSTCALL_INIT();
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mctx = MemoryContextSwitchTo(fctx->multi_call_memory_ctx);
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page = verify_hash_page(raw_page, LH_BUCKET_PAGE | LH_OVERFLOW_PAGE);
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uargs = palloc(sizeof(struct user_args));
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uargs->page = page;
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uargs->offset = FirstOffsetNumber;
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fctx->max_calls = PageGetMaxOffsetNumber(uargs->page);
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/* Build a tuple descriptor for our result type */
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if (get_call_result_type(fcinfo, NULL, &tupleDesc) != TYPEFUNC_COMPOSITE)
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elog(ERROR, "return type must be a row type");
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tupleDesc = BlessTupleDesc(tupleDesc);
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fctx->attinmeta = TupleDescGetAttInMetadata(tupleDesc);
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fctx->user_fctx = uargs;
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MemoryContextSwitchTo(mctx);
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}
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fctx = SRF_PERCALL_SETUP();
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uargs = fctx->user_fctx;
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if (fctx->call_cntr < fctx->max_calls)
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{
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ItemId id;
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IndexTuple itup;
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int j;
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id = PageGetItemId(uargs->page, uargs->offset);
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if (!ItemIdIsValid(id))
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elog(ERROR, "invalid ItemId");
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itup = (IndexTuple) PageGetItem(uargs->page, id);
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MemSet(nulls, 0, sizeof(nulls));
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j = 0;
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values[j++] = Int32GetDatum((int32) uargs->offset);
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values[j++] = PointerGetDatum(&itup->t_tid);
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hashkey = _hash_get_indextuple_hashkey(itup);
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values[j] = Int64GetDatum((int64) hashkey);
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tuple = heap_form_tuple(fctx->attinmeta->tupdesc, values, nulls);
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result = HeapTupleGetDatum(tuple);
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uargs->offset = uargs->offset + 1;
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SRF_RETURN_NEXT(fctx, result);
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}
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else
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{
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pfree(uargs);
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SRF_RETURN_DONE(fctx);
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}
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}
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/* ------------------------------------------------
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* hash_bitmap_info()
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*
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* Get bitmap information for a particular overflow page
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*
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* Usage: SELECT * FROM hash_bitmap_info('con_hash_index'::regclass, 5);
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* ------------------------------------------------
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*/
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Datum
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hash_bitmap_info(PG_FUNCTION_ARGS)
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{
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Oid indexRelid = PG_GETARG_OID(0);
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uint64 ovflblkno = PG_GETARG_INT64(1);
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HashMetaPage metap;
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Buffer metabuf,
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mapbuf;
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BlockNumber bitmapblkno;
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Page mappage;
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bool bit = false;
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TupleDesc tupleDesc;
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Relation indexRel;
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uint32 ovflbitno;
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int32 bitmappage,
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bitmapbit;
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HeapTuple tuple;
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int i,
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j;
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Datum values[3];
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bool nulls[3];
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uint32 *freep;
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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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indexRel = index_open(indexRelid, AccessShareLock);
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if (!IS_HASH(indexRel))
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elog(ERROR, "relation \"%s\" is not a hash index",
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RelationGetRelationName(indexRel));
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if (RELATION_IS_OTHER_TEMP(indexRel))
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ereport(ERROR,
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(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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errmsg("cannot access temporary tables of other sessions")));
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if (ovflblkno >= RelationGetNumberOfBlocks(indexRel))
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("block number " UINT64_FORMAT " is out of range for relation \"%s\"",
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ovflblkno, RelationGetRelationName(indexRel))));
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/* Read the metapage so we can determine which bitmap page to use */
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metabuf = _hash_getbuf(indexRel, HASH_METAPAGE, HASH_READ, LH_META_PAGE);
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metap = HashPageGetMeta(BufferGetPage(metabuf));
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/*
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* Reject attempt to read the bit for a metapage or bitmap page; this is
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* only meaningful for overflow pages.
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*/
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if (ovflblkno == 0)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("invalid overflow block number %u",
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(BlockNumber) ovflblkno)));
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for (i = 0; i < metap->hashm_nmaps; i++)
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if (metap->hashm_mapp[i] == ovflblkno)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("invalid overflow block number %u",
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(BlockNumber) ovflblkno)));
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/*
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* Identify overflow bit number. This will error out for primary bucket
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* pages, and we've already rejected the metapage and bitmap pages above.
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*/
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ovflbitno = _hash_ovflblkno_to_bitno(metap, (BlockNumber) ovflblkno);
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bitmappage = ovflbitno >> BMPG_SHIFT(metap);
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bitmapbit = ovflbitno & BMPG_MASK(metap);
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if (bitmappage >= metap->hashm_nmaps)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("invalid overflow block number %u",
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(BlockNumber) ovflblkno)));
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bitmapblkno = metap->hashm_mapp[bitmappage];
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_hash_relbuf(indexRel, metabuf);
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/* Check the status of bitmap bit for overflow page */
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mapbuf = _hash_getbuf(indexRel, bitmapblkno, HASH_READ, LH_BITMAP_PAGE);
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mappage = BufferGetPage(mapbuf);
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freep = HashPageGetBitmap(mappage);
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bit = ISSET(freep, bitmapbit) != 0;
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_hash_relbuf(indexRel, mapbuf);
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index_close(indexRel, AccessShareLock);
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/* Build a tuple descriptor for our result type */
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if (get_call_result_type(fcinfo, NULL, &tupleDesc) != TYPEFUNC_COMPOSITE)
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elog(ERROR, "return type must be a row type");
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tupleDesc = BlessTupleDesc(tupleDesc);
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MemSet(nulls, 0, sizeof(nulls));
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j = 0;
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values[j++] = Int64GetDatum((int64) bitmapblkno);
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values[j++] = Int32GetDatum(bitmapbit);
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values[j++] = BoolGetDatum(bit);
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tuple = heap_form_tuple(tupleDesc, values, nulls);
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PG_RETURN_DATUM(HeapTupleGetDatum(tuple));
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}
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/* ------------------------------------------------
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* hash_metapage_info()
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*
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* Get the meta-page information for a hash index
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*
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* Usage: SELECT * FROM hash_metapage_info(get_raw_page('con_hash_index', 0))
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* ------------------------------------------------
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*/
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Datum
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hash_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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Page page;
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HashMetaPageData *metad;
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TupleDesc tupleDesc;
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HeapTuple tuple;
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int i,
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j;
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Datum values[16];
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bool nulls[16];
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Datum spares[HASH_MAX_SPLITPOINTS];
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Datum mapp[HASH_MAX_BITMAPS];
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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 = verify_hash_page(raw_page, LH_META_PAGE);
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/* Build a tuple descriptor for our result type */
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if (get_call_result_type(fcinfo, NULL, &tupleDesc) != TYPEFUNC_COMPOSITE)
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elog(ERROR, "return type must be a row type");
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tupleDesc = BlessTupleDesc(tupleDesc);
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metad = HashPageGetMeta(page);
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MemSet(nulls, 0, sizeof(nulls));
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j = 0;
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values[j++] = Int64GetDatum((int64) metad->hashm_magic);
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values[j++] = Int64GetDatum((int64) metad->hashm_version);
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values[j++] = Float8GetDatum(metad->hashm_ntuples);
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values[j++] = Int32GetDatum((int32) metad->hashm_ffactor);
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values[j++] = Int32GetDatum((int32) metad->hashm_bsize);
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values[j++] = Int32GetDatum((int32) metad->hashm_bmsize);
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values[j++] = Int32GetDatum((int32) metad->hashm_bmshift);
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values[j++] = Int64GetDatum((int64) metad->hashm_maxbucket);
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values[j++] = Int64GetDatum((int64) metad->hashm_highmask);
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values[j++] = Int64GetDatum((int64) metad->hashm_lowmask);
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values[j++] = Int64GetDatum((int64) metad->hashm_ovflpoint);
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values[j++] = Int64GetDatum((int64) metad->hashm_firstfree);
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values[j++] = Int64GetDatum((int64) metad->hashm_nmaps);
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values[j++] = ObjectIdGetDatum((Oid) metad->hashm_procid);
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for (i = 0; i < HASH_MAX_SPLITPOINTS; i++)
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spares[i] = Int64GetDatum((int64) metad->hashm_spares[i]);
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values[j++] = PointerGetDatum(construct_array(spares,
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HASH_MAX_SPLITPOINTS,
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INT8OID,
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8, FLOAT8PASSBYVAL, 'd'));
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for (i = 0; i < HASH_MAX_BITMAPS; i++)
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mapp[i] = Int64GetDatum((int64) metad->hashm_mapp[i]);
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values[j++] = PointerGetDatum(construct_array(mapp,
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HASH_MAX_BITMAPS,
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INT8OID,
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8, FLOAT8PASSBYVAL, 'd'));
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tuple = heap_form_tuple(tupleDesc, values, nulls);
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PG_RETURN_DATUM(HeapTupleGetDatum(tuple));
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}
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