bufmask.h File Reference

#include "storage/block.h"
#include "storage/bufmgr.h"

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Macros
#define	MASK_MARKER   0

Functions
void	mask_page_lsn (Page page)
void	mask_page_hint_bits (Page page)
void	mask_unused_space (Page page)
void	mask_lp_flags (Page page)
void	mask_page_content (Page page)

Macro Definition Documentation

#define MASK_MARKER   0

Definition at line 24 of file bufmask.h.

Referenced by gist_mask(), heap_mask(), mask_page_content(), mask_page_hint_bits(), mask_page_lsn(), and mask_unused_space().

Function Documentation

void mask_lp_flags

(

Page

page

)

Definition at line 93 of file bufmask.c.

References FirstOffsetNumber, ItemIdIsUsed, ItemIdData::lp_flags, LP_UNUSED, OffsetNumberNext, PageGetItemId, and PageGetMaxOffsetNumber.

Referenced by btree_mask(), gist_mask(), and hash_mask().

{
    OffsetNumber offnum,
                maxoff;

    maxoff = PageGetMaxOffsetNumber(page);
    for (offnum = FirstOffsetNumber;
         offnum <= maxoff;
         offnum = OffsetNumberNext(offnum))
    {
        ItemId      itemId = PageGetItemId(page, offnum);

        if (ItemIdIsUsed(itemId))
            itemId->lp_flags = LP_UNUSED;
    }
}

void mask_page_content

(

Page

page

)

Definition at line 117 of file bufmask.c.

References MASK_MARKER, and SizeOfPageHeaderData.

Referenced by btree_mask(), gin_mask(), and hash_mask().

{
    /* Mask Page Content */
    memset(page + SizeOfPageHeaderData, MASK_MARKER,
           BLCKSZ - SizeOfPageHeaderData);

    /* Mask pd_lower and pd_upper */
    memset(&((PageHeader) page)->pd_lower, MASK_MARKER,
           sizeof(uint16));
    memset(&((PageHeader) page)->pd_upper, MASK_MARKER,
           sizeof(uint16));
}

void mask_page_hint_bits

(

Page

page

)

Definition at line 44 of file bufmask.c.

References MASK_MARKER, PageClearAllVisible, PageClearFull, PageClearHasFreeLinePointers, and PageHeaderData::pd_prune_xid.

Referenced by brin_mask(), btree_mask(), gin_mask(), gist_mask(), hash_mask(), heap_mask(), and spg_mask().

{
    PageHeader  phdr = (PageHeader) page;

    /* Ignore prune_xid (it's like a hint-bit) */
    phdr->pd_prune_xid = MASK_MARKER;

    /* Ignore PD_PAGE_FULL and PD_HAS_FREE_LINES flags, they are just hints. */
    PageClearFull(page);
    PageClearHasFreeLinePointers(page);

    /*
     * During replay, if the page LSN has advanced past our XLOG record's LSN,
     * we don't mark the page all-visible. See heap_xlog_visible() for
     * details.
     */
    PageClearAllVisible(page);
}

void mask_page_lsn

(

Page

page

)

Definition at line 30 of file bufmask.c.

References MASK_MARKER, PageXLogRecPtrSet, and PageHeaderData::pd_lsn.

Referenced by brin_mask(), btree_mask(), generic_mask(), gin_mask(), gist_mask(), hash_mask(), heap_mask(), seq_mask(), and spg_mask().

{
    PageHeader  phdr = (PageHeader) page;

    PageXLogRecPtrSet(phdr->pd_lsn, (uint64) MASK_MARKER);
}

void mask_unused_space

(

Page

page

)

Definition at line 69 of file bufmask.c.

References elog, ERROR, and MASK_MARKER.

Referenced by brin_mask(), btree_mask(), generic_mask(), gin_mask(), gist_mask(), hash_mask(), heap_mask(), seq_mask(), and spg_mask().

{
    int         pd_lower = ((PageHeader) page)->pd_lower;
    int         pd_upper = ((PageHeader) page)->pd_upper;
    int         pd_special = ((PageHeader) page)->pd_special;

    /* Sanity check */
    if (pd_lower > pd_upper || pd_special < pd_upper ||
        pd_lower < SizeOfPageHeaderData || pd_special > BLCKSZ)
    {
        elog(ERROR, "invalid page pd_lower %u pd_upper %u pd_special %u\n",
             pd_lower, pd_upper, pd_special);
    }

    memset(page + pd_lower, MASK_MARKER, pd_upper - pd_lower);
}