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

Include dependency graph for bufmask.h:

This graph shows which files directly or indirectly include this file:

Macros
#define	MASK_MARKER 0

Functions
void	mask_page_lsn_and_checksum (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

◆ MASK_MARKER

#define MASK_MARKER 0

Definition at line 24 of file bufmask.h.

Function Documentation

◆ mask_lp_flags()

void mask_lp_flags ( Page page )

Definition at line 95 of file bufmask.c.

 {
     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;
     }
 }

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

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

◆ mask_page_content()

void mask_page_content ( Page page )

Definition at line 119 of file bufmask.c.

 {
     /* 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));
 }

References MASK_MARKER, and SizeOfPageHeaderData.

Referenced by gin_mask(), and hash_mask().

◆ mask_page_hint_bits()

void mask_page_hint_bits ( Page page )

Definition at line 46 of file bufmask.c.

 {
     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);
 }

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().

◆ mask_page_lsn_and_checksum()

void mask_page_lsn_and_checksum ( Page page )

Definition at line 31 of file bufmask.c.

 {
     PageHeader  phdr = (PageHeader) page;
  
     PageXLogRecPtrSet(phdr->pd_lsn, (uint64) MASK_MARKER);
     phdr->pd_checksum = MASK_MARKER;
 }

References MASK_MARKER, PageXLogRecPtrSet, PageHeaderData::pd_checksum, 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().

◆ mask_unused_space()

void mask_unused_space ( Page page )

Definition at line 71 of file bufmask.c.

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

References elog, ERROR, and MASK_MARKER.