PostgreSQL Source Code git master
Functions
bufmask.c File Reference
#include "postgres.h"
#include "access/bufmask.h"
Include dependency graph for bufmask.c:

Go to the source code of this file.

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)
 

Function Documentation

◆ mask_lp_flags()

void mask_lp_flags ( Page  page )

Definition at line 95 of file bufmask.c.

96{
97 OffsetNumber offnum,
98 maxoff;
99
100 maxoff = PageGetMaxOffsetNumber(page);
101 for (offnum = FirstOffsetNumber;
102 offnum <= maxoff;
103 offnum = OffsetNumberNext(offnum))
104 {
105 ItemId itemId = PageGetItemId(page, offnum);
106
107 if (ItemIdIsUsed(itemId))
108 itemId->lp_flags = LP_UNUSED;
109 }
110}
static ItemId PageGetItemId(Page page, OffsetNumber offsetNumber)
Definition: bufpage.h:244
static OffsetNumber PageGetMaxOffsetNumber(const PageData *page)
Definition: bufpage.h:372
#define LP_UNUSED
Definition: itemid.h:38
#define ItemIdIsUsed(itemId)
Definition: itemid.h:92
#define OffsetNumberNext(offsetNumber)
Definition: off.h:52
uint16 OffsetNumber
Definition: off.h:24
#define FirstOffsetNumber
Definition: off.h:27
Definition: itemid.h:26
unsigned lp_flags
Definition: itemid.h:28

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.

120{
121 /* Mask Page Content */
122 memset(page + SizeOfPageHeaderData, MASK_MARKER,
123 BLCKSZ - SizeOfPageHeaderData);
124
125 /* Mask pd_lower and pd_upper */
126 memset(&((PageHeader) page)->pd_lower, MASK_MARKER,
127 sizeof(uint16));
128 memset(&((PageHeader) page)->pd_upper, MASK_MARKER,
129 sizeof(uint16));
130}
#define MASK_MARKER
Definition: bufmask.h:24
#define SizeOfPageHeaderData
Definition: bufpage.h:217
uint16_t uint16
Definition: c.h:537

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.

47{
48 PageHeader phdr = (PageHeader) page;
49
50 /* Ignore prune_xid (it's like a hint-bit) */
52
53 /* Ignore PD_PAGE_FULL and PD_HAS_FREE_LINES flags, they are just hints. */
54 PageClearFull(page);
56
57 /*
58 * During replay, if the page LSN has advanced past our XLOG record's LSN,
59 * we don't mark the page all-visible. See heap_xlog_visible() for
60 * details.
61 */
63}
PageHeaderData * PageHeader
Definition: bufpage.h:174
static void PageClearAllVisible(Page page)
Definition: bufpage.h:439
static void PageClearFull(Page page)
Definition: bufpage.h:423
static void PageClearHasFreeLinePointers(Page page)
Definition: bufpage.h:407
TransactionId pd_prune_xid
Definition: bufpage.h:170

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.

32{
33 PageHeader phdr = (PageHeader) page;
34
37}
#define PageXLogRecPtrSet(ptr, lsn)
Definition: bufpage.h:110
uint64_t uint64
Definition: c.h:539
PageXLogRecPtr pd_lsn
Definition: bufpage.h:162
uint16 pd_checksum
Definition: bufpage.h:164

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.

72{
73 int pd_lower = ((PageHeader) page)->pd_lower;
74 int pd_upper = ((PageHeader) page)->pd_upper;
75 int pd_special = ((PageHeader) page)->pd_special;
76
77 /* Sanity check */
78 if (pd_lower > pd_upper || pd_special < pd_upper ||
79 pd_lower < SizeOfPageHeaderData || pd_special > BLCKSZ)
80 {
81 elog(ERROR, "invalid page pd_lower %u pd_upper %u pd_special %u",
82 pd_lower, pd_upper, pd_special);
83 }
84
85 memset(page + pd_lower, MASK_MARKER, pd_upper - pd_lower);
86}
#define ERROR
Definition: elog.h:39
#define elog(elevel,...)
Definition: elog.h:226

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().

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