#include "postgres.h"
#include "access/amapi.h"
#include "access/generic_xlog.h"
#include "access/reloptions.h"
#include "bloom.h"
#include "commands/vacuum.h"
#include "storage/bufmgr.h"
#include "storage/indexfsm.h"
#include "utils/memutils.h"
#include "varatt.h"

Include dependency graph for blutils.c:

Macros
#define	GETWORD(x, i) ( ( (BloomSignatureWord )(x) + ( (i) / SIGNWORDBITS ) ) )

#define	CLRBIT(x, i) GETWORD(x,i) &= ~( 0x01 << ( (i) % SIGNWORDBITS ) )

#define	SETBIT(x, i) GETWORD(x,i) \|= ( 0x01 << ( (i) % SIGNWORDBITS ) )

#define	GETBIT(x, i) ( (GETWORD(x,i) >> ( (i) % SIGNWORDBITS )) & 0x01 )

Functions
	PG_FUNCTION_INFO_V1 (blhandler)

static int32	myRand (void)

static void	mySrand (uint32 seed)

void	_PG_init (void)

static BloomOptions *	makeDefaultBloomOptions (void)

Datum	blhandler (PG_FUNCTION_ARGS)

void	initBloomState (BloomState *state, Relation index)

void	signValue (BloomState state, BloomSignatureWord sign, Datum value, int attno)

BloomTuple *	BloomFormTuple (BloomState state, ItemPointer iptr, Datum values, bool *isnull)

bool	BloomPageAddItem (BloomState state, Page page, BloomTuple tuple)

Buffer	BloomNewBuffer (Relation index)

void	BloomInitPage (Page page, uint16 flags)

void	BloomFillMetapage (Relation index, Page metaPage)

void	BloomInitMetapage (Relation index, ForkNumber forknum)

bytea *	bloptions (Datum reloptions, bool validate)

Variables
static relopt_kind	bl_relopt_kind

static relopt_parse_elt	bl_relopt_tab [INDEX_MAX_KEYS+1]

static int32	next

Macro Definition Documentation

◆ CLRBIT

#define CLRBIT	(	x,
		i
	)	GETWORD(x,i) &= ~( 0x01 << ( (i) % SIGNWORDBITS ) )

Definition at line 28 of file blutils.c.

◆ GETBIT

#define GETBIT	(	x,
		i
	)	( (GETWORD(x,i) >> ( (i) % SIGNWORDBITS )) & 0x01 )

Definition at line 30 of file blutils.c.

◆ GETWORD

#define GETWORD	(	x,
		i
	)	( ( (BloomSignatureWord )(x) + ( (i) / SIGNWORDBITS ) ) )

Definition at line 27 of file blutils.c.

◆ SETBIT

#define SETBIT	(	x,
		i
	)	GETWORD(x,i) \|= ( 0x01 << ( (i) % SIGNWORDBITS ) )

Definition at line 29 of file blutils.c.

Function Documentation

◆ _PG_init()

void _PG_init ( void )

Definition at line 49 of file blutils.c.

{
    int         i;
    char        buf[16];
 
    bl_relopt_kind = add_reloption_kind();
 
    /* Option for length of signature */
    add_int_reloption(bl_relopt_kind, "length",
                      "Length of signature in bits",
                      DEFAULT_BLOOM_LENGTH, 1, MAX_BLOOM_LENGTH,
                      AccessExclusiveLock);
    bl_relopt_tab[0].optname = "length";
    bl_relopt_tab[0].opttype = RELOPT_TYPE_INT;
    bl_relopt_tab[0].offset = offsetof(BloomOptions, bloomLength);
 
    /* Number of bits for each possible index column: col1, col2, ... */
    for (i = 0; i < INDEX_MAX_KEYS; i++)
    {
        snprintf(buf, sizeof(buf), "col%d", i + 1);
        add_int_reloption(bl_relopt_kind, buf,
                          "Number of bits generated for each index column",
                          DEFAULT_BLOOM_BITS, 1, MAX_BLOOM_BITS,
                          AccessExclusiveLock);
        bl_relopt_tab[i + 1].optname = MemoryContextStrdup(TopMemoryContext,
                                                           buf);
        bl_relopt_tab[i + 1].opttype = RELOPT_TYPE_INT;
        bl_relopt_tab[i + 1].offset = offsetof(BloomOptions, bitSize[0]) + sizeof(int) * i;
    }
}

References AccessExclusiveLock, add_int_reloption(), add_reloption_kind(), bl_relopt_kind, bl_relopt_tab, buf, DEFAULT_BLOOM_BITS, DEFAULT_BLOOM_LENGTH, i, INDEX_MAX_KEYS, MAX_BLOOM_BITS, MAX_BLOOM_LENGTH, MemoryContextStrdup(), relopt_parse_elt::offset, relopt_parse_elt::optname, relopt_parse_elt::opttype, RELOPT_TYPE_INT, snprintf, and TopMemoryContext.

◆ blhandler()

Datum blhandler ( PG_FUNCTION_ARGS )

Definition at line 103 of file blutils.c.

{
    IndexAmRoutine *amroutine = makeNode(IndexAmRoutine);
 
    amroutine->amstrategies = BLOOM_NSTRATEGIES;
    amroutine->amsupport = BLOOM_NPROC;
    amroutine->amoptsprocnum = BLOOM_OPTIONS_PROC;
    amroutine->amcanorder = false;
    amroutine->amcanorderbyop = false;
    amroutine->amcanbackward = false;
    amroutine->amcanunique = false;
    amroutine->amcanmulticol = true;
    amroutine->amoptionalkey = true;
    amroutine->amsearcharray = false;
    amroutine->amsearchnulls = false;
    amroutine->amstorage = false;
    amroutine->amclusterable = false;
    amroutine->ampredlocks = false;
    amroutine->amcanparallel = false;
    amroutine->amcanbuildparallel = false;
    amroutine->amcaninclude = false;
    amroutine->amusemaintenanceworkmem = false;
    amroutine->amparallelvacuumoptions =
        VACUUM_OPTION_PARALLEL_BULKDEL | VACUUM_OPTION_PARALLEL_CLEANUP;
    amroutine->amkeytype = InvalidOid;
 
    amroutine->ambuild = blbuild;
    amroutine->ambuildempty = blbuildempty;
    amroutine->aminsert = blinsert;
    amroutine->aminsertcleanup = NULL;
    amroutine->ambulkdelete = blbulkdelete;
    amroutine->amvacuumcleanup = blvacuumcleanup;
    amroutine->amcanreturn = NULL;
    amroutine->amcostestimate = blcostestimate;
    amroutine->amgettreeheight = NULL;
    amroutine->amoptions = bloptions;
    amroutine->amproperty = NULL;
    amroutine->ambuildphasename = NULL;
    amroutine->amvalidate = blvalidate;
    amroutine->amadjustmembers = NULL;
    amroutine->ambeginscan = blbeginscan;
    amroutine->amrescan = blrescan;
    amroutine->amgettuple = NULL;
    amroutine->amgetbitmap = blgetbitmap;
    amroutine->amendscan = blendscan;
    amroutine->ammarkpos = NULL;
    amroutine->amrestrpos = NULL;
    amroutine->amestimateparallelscan = NULL;
    amroutine->aminitparallelscan = NULL;
    amroutine->amparallelrescan = NULL;
 
    PG_RETURN_POINTER(amroutine);
}

◆ BloomFillMetapage()

void BloomFillMetapage	(	Relation	index,
		Page	metaPage
	)

Definition at line 414 of file blutils.c.

{
    BloomOptions *opts;
    BloomMetaPageData *metadata;
 
    /*
     * Choose the index's options.  If reloptions have been assigned, use
     * those, otherwise create default options.
     */
    opts = (BloomOptions *) index->rd_options;
    if (!opts)
        opts = makeDefaultBloomOptions();
 
    /*
     * Initialize contents of meta page, including a copy of the options,
     * which are now frozen for the life of the index.
     */
    BloomInitPage(metaPage, BLOOM_META);
    metadata = BloomPageGetMeta(metaPage);
    memset(metadata, 0, sizeof(BloomMetaPageData));
    metadata->magickNumber = BLOOM_MAGICK_NUMBER;
    metadata->opts = *opts;
    ((PageHeader) metaPage)->pd_lower += sizeof(BloomMetaPageData);
 
    /* If this fails, probably FreeBlockNumberArray size calc is wrong: */
    Assert(((PageHeader) metaPage)->pd_lower <= ((PageHeader) metaPage)->pd_upper);
}

References Assert, BLOOM_MAGICK_NUMBER, BLOOM_META, BloomInitPage(), BloomPageGetMeta, if(), BloomMetaPageData::magickNumber, makeDefaultBloomOptions(), BloomMetaPageData::opts, and opts.

Referenced by BloomInitMetapage().

◆ BloomFormTuple()

BloomTuple * BloomFormTuple	(	BloomState *	state,
		ItemPointer	iptr,
		Datum *	values,
		bool *	isnull
	)

Definition at line 293 of file blutils.c.

{
    int         i;
    BloomTuple *res = (BloomTuple *) palloc0(state->sizeOfBloomTuple);
 
    res->heapPtr = *iptr;
 
    /* Blooming each column */
    for (i = 0; i < state->nColumns; i++)
    {
        /* skip nulls */
        if (isnull[i])
            continue;
 
        signValue(state, res->sign, values[i], i);
    }
 
    return res;
}

References i, palloc0(), res, signValue(), and values.

Referenced by blinsert(), and bloomBuildCallback().

◆ BloomInitMetapage()

void BloomInitMetapage	(	Relation	index,
		ForkNumber	forknum
	)

Definition at line 446 of file blutils.c.

{
    Buffer      metaBuffer;
    Page        metaPage;
    GenericXLogState *state;
 
    /*
     * Make a new page; since it is first page it should be associated with
     * block number 0 (BLOOM_METAPAGE_BLKNO).  No need to hold the extension
     * lock because there cannot be concurrent inserters yet.
     */
    metaBuffer = ReadBufferExtended(index, forknum, P_NEW, RBM_NORMAL, NULL);
    LockBuffer(metaBuffer, BUFFER_LOCK_EXCLUSIVE);
    Assert(BufferGetBlockNumber(metaBuffer) == BLOOM_METAPAGE_BLKNO);
 
    /* Initialize contents of meta page */
    state = GenericXLogStart(index);
    metaPage = GenericXLogRegisterBuffer(state, metaBuffer,
                                         GENERIC_XLOG_FULL_IMAGE);
    BloomFillMetapage(index, metaPage);
    GenericXLogFinish(state);
 
    UnlockReleaseBuffer(metaBuffer);
}

References Assert, BLOOM_METAPAGE_BLKNO, BloomFillMetapage(), BUFFER_LOCK_EXCLUSIVE, BufferGetBlockNumber(), GENERIC_XLOG_FULL_IMAGE, GenericXLogFinish(), GenericXLogRegisterBuffer(), GenericXLogStart(), LockBuffer(), P_NEW, RBM_NORMAL, ReadBufferExtended(), and UnlockReleaseBuffer().

Referenced by blbuild(), and blbuildempty().

◆ BloomInitPage()

void BloomInitPage	(	Page	page,
		uint16	flags
	)

Definition at line 399 of file blutils.c.

{
    BloomPageOpaque opaque;
 
    PageInit(page, BLCKSZ, sizeof(BloomPageOpaqueData));
 
    opaque = BloomPageGetOpaque(page);
    opaque->flags = flags;
    opaque->bloom_page_id = BLOOM_PAGE_ID;
}

References BloomPageOpaqueData::bloom_page_id, BLOOM_PAGE_ID, BloomPageGetOpaque, BloomPageOpaqueData::flags, and PageInit().

Referenced by blinsert(), BloomFillMetapage(), and initCachedPage().

◆ BloomNewBuffer()

Buffer BloomNewBuffer ( Relation index )

Definition at line 353 of file blutils.c.

{
    Buffer      buffer;
 
    /* First, try to get a page from FSM */
    for (;;)
    {
        BlockNumber blkno = GetFreeIndexPage(index);
 
        if (blkno == InvalidBlockNumber)
            break;
 
        buffer = ReadBuffer(index, blkno);
 
        /*
         * We have to guard against the possibility that someone else already
         * recycled this page; the buffer may be locked if so.
         */
        if (ConditionalLockBuffer(buffer))
        {
            Page        page = BufferGetPage(buffer);
 
            if (PageIsNew(page))
                return buffer;  /* OK to use, if never initialized */
 
            if (BloomPageIsDeleted(page))
                return buffer;  /* OK to use */
 
            LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
        }
 
        /* Can't use it, so release buffer and try again */
        ReleaseBuffer(buffer);
    }
 
    /* Must extend the file */
    buffer = ExtendBufferedRel(BMR_REL(index), MAIN_FORKNUM, NULL,
                               EB_LOCK_FIRST);
 
    return buffer;
}

References BloomPageIsDeleted, BMR_REL, BUFFER_LOCK_UNLOCK, BufferGetPage(), ConditionalLockBuffer(), EB_LOCK_FIRST, ExtendBufferedRel(), GetFreeIndexPage(), InvalidBlockNumber, LockBuffer(), MAIN_FORKNUM, PageIsNew(), ReadBuffer(), and ReleaseBuffer().

Referenced by blinsert(), and flushCachedPage().

◆ BloomPageAddItem()

bool BloomPageAddItem	(	BloomState *	state,
		Page	page,
		BloomTuple *	tuple
	)

Definition at line 318 of file blutils.c.

{
    BloomTuple *itup;
    BloomPageOpaque opaque;
    Pointer     ptr;
 
    /* We shouldn't be pointed to an invalid page */
    Assert(!PageIsNew(page) && !BloomPageIsDeleted(page));
 
    /* Does new tuple fit on the page? */
    if (BloomPageGetFreeSpace(state, page) < state->sizeOfBloomTuple)
        return false;
 
    /* Copy new tuple to the end of page */
    opaque = BloomPageGetOpaque(page);
    itup = BloomPageGetTuple(state, page, opaque->maxoff + 1);
    memcpy((Pointer) itup, (Pointer) tuple, state->sizeOfBloomTuple);
 
    /* Adjust maxoff and pd_lower */
    opaque->maxoff++;
    ptr = (Pointer) BloomPageGetTuple(state, page, opaque->maxoff + 1);
    ((PageHeader) page)->pd_lower = ptr - page;
 
    /* Assert we didn't overrun available space */
    Assert(((PageHeader) page)->pd_lower <= ((PageHeader) page)->pd_upper);
 
    return true;
}

References Assert, BloomPageGetFreeSpace, BloomPageGetOpaque, BloomPageGetTuple, BloomPageIsDeleted, BloomPageOpaqueData::maxoff, and PageIsNew().

Referenced by blinsert(), and bloomBuildCallback().

◆ bloptions()

bytea * bloptions	(	Datum	reloptions,
		bool	validate
	)

Definition at line 475 of file blutils.c.

{
    BloomOptions *rdopts;
 
    /* Parse the user-given reloptions */
    rdopts = (BloomOptions *) build_reloptions(reloptions, validate,
                                               bl_relopt_kind,
                                               sizeof(BloomOptions),
                                               bl_relopt_tab,
                                               lengthof(bl_relopt_tab));
 
    /* Convert signature length from # of bits to # to words, rounding up */
    if (rdopts)
        rdopts->bloomLength = (rdopts->bloomLength + SIGNWORDBITS - 1) / SIGNWORDBITS;
 
    return (bytea *) rdopts;
}

References bl_relopt_kind, bl_relopt_tab, BloomOptions::bloomLength, build_reloptions(), lengthof, and SIGNWORDBITS.

Referenced by blhandler().

◆ initBloomState()

void initBloomState	(	BloomState *	state,
		Relation	index
	)

Definition at line 161 of file blutils.c.

{
    int         i;
 
    state->nColumns = index->rd_att->natts;
 
    /* Initialize hash function for each attribute */
    for (i = 0; i < index->rd_att->natts; i++)
    {
        fmgr_info_copy(&(state->hashFn[i]),
                       index_getprocinfo(index, i + 1, BLOOM_HASH_PROC),
                       CurrentMemoryContext);
        state->collations[i] = index->rd_indcollation[i];
    }
 
    /* Initialize amcache if needed with options from metapage */
    if (!index->rd_amcache)
    {
        Buffer      buffer;
        Page        page;
        BloomMetaPageData *meta;
        BloomOptions *opts;
 
        opts = MemoryContextAlloc(index->rd_indexcxt, sizeof(BloomOptions));
 
        buffer = ReadBuffer(index, BLOOM_METAPAGE_BLKNO);
        LockBuffer(buffer, BUFFER_LOCK_SHARE);
 
        page = BufferGetPage(buffer);
 
        if (!BloomPageIsMeta(page))
            elog(ERROR, "Relation is not a bloom index");
        meta = BloomPageGetMeta(BufferGetPage(buffer));
 
        if (meta->magickNumber != BLOOM_MAGICK_NUMBER)
            elog(ERROR, "Relation is not a bloom index");
 
        *opts = meta->opts;
 
        UnlockReleaseBuffer(buffer);
 
        index->rd_amcache = opts;
    }
 
    memcpy(&state->opts, index->rd_amcache, sizeof(state->opts));
    state->sizeOfBloomTuple = BLOOMTUPLEHDRSZ +
        sizeof(BloomSignatureWord) * state->opts.bloomLength;
}

References BLOOM_HASH_PROC, BLOOM_MAGICK_NUMBER, BLOOM_METAPAGE_BLKNO, BloomPageGetMeta, BloomPageIsMeta, BLOOMTUPLEHDRSZ, BUFFER_LOCK_SHARE, BufferGetPage(), CurrentMemoryContext, elog, ERROR, fmgr_info_copy(), i, index_getprocinfo(), LockBuffer(), BloomMetaPageData::magickNumber, MemoryContextAlloc(), BloomMetaPageData::opts, opts, ReadBuffer(), and UnlockReleaseBuffer().

Referenced by blbeginscan(), blbuild(), blbulkdelete(), and blinsert().

◆ makeDefaultBloomOptions()

static BloomOptions * makeDefaultBloomOptions ( void )

static

Definition at line 84 of file blutils.c.

{
    BloomOptions *opts;
    int         i;
 
    opts = (BloomOptions *) palloc0(sizeof(BloomOptions));
    /* Convert DEFAULT_BLOOM_LENGTH from # of bits to # of words */
    opts->bloomLength = (DEFAULT_BLOOM_LENGTH + SIGNWORDBITS - 1) / SIGNWORDBITS;
    for (i = 0; i < INDEX_MAX_KEYS; i++)
        opts->bitSize[i] = DEFAULT_BLOOM_BITS;
    SET_VARSIZE(opts, sizeof(BloomOptions));
    return opts;
}

References DEFAULT_BLOOM_BITS, DEFAULT_BLOOM_LENGTH, i, INDEX_MAX_KEYS, opts, palloc0(), SET_VARSIZE, and SIGNWORDBITS.

Referenced by BloomFillMetapage().

◆ myRand()

static int32 myRand ( void )

static

Definition at line 222 of file blutils.c.

{
    /*----------
     * Compute x = (7^5 * x) mod (2^31 - 1)
     * without overflowing 31 bits:
     *      (2^31 - 1) = 127773 * (7^5) + 2836
     * From "Random number generators: good ones are hard to find",
     * Park and Miller, Communications of the ACM, vol. 31, no. 10,
     * October 1988, p. 1195.
     *----------
     */
    int32       hi,
                lo,
                x;
 
    /* Must be in [1, 0x7ffffffe] range at this point. */
    hi = next / 127773;
    lo = next % 127773;
    x = 16807 * lo - 2836 * hi;
    if (x < 0)
        x += 0x7fffffff;
    next = x;
    /* Transform to [0, 0x7ffffffd] range. */
    return (x - 1);
}

References next, and x.

Referenced by signValue().

◆ mySrand()

static void mySrand ( uint32 seed )

static

Definition at line 249 of file blutils.c.

{
    next = seed;
    /* Transform to [1, 0x7ffffffe] range. */
    next = (next % 0x7ffffffe) + 1;
}

References next.

Referenced by signValue().

◆ PG_FUNCTION_INFO_V1()

PG_FUNCTION_INFO_V1 ( blhandler )

◆ signValue()

void signValue	(	BloomState *	state,
		BloomSignatureWord *	sign,
		Datum	value,
		int	attno
	)

Definition at line 260 of file blutils.c.

{
    uint32      hashVal;
    int         nBit,
                j;
 
    /*
     * init generator with "column's" number to get "hashed" seed for new
     * value. We don't want to map the same numbers from different columns
     * into the same bits!
     */
    mySrand(attno);
 
    /*
     * Init hash sequence to map our value into bits. the same values in
     * different columns will be mapped into different bits because of step
     * above
     */
    hashVal = DatumGetInt32(FunctionCall1Coll(&state->hashFn[attno], state->collations[attno], value));
    mySrand(hashVal ^ myRand());
 
    for (j = 0; j < state->opts.bitSize[attno]; j++)
    {
        /* prevent multiple evaluation in SETBIT macro */
        nBit = myRand() % (state->opts.bloomLength * SIGNWORDBITS);
        SETBIT(sign, nBit);
    }
}