/*
* Mask a GIN page before running consistency checks on it.
*/
void
gin_mask(char *pagedata, BlockNumber blkno)
{
Page page = (Page) pagedata;
GinPageOpaque opaque;
mask_page_lsn_and_checksum(page);
opaque = GinPageGetOpaque(page);
mask_page_hint_bits(page);
/*
* GIN metapage doesn't use pd_lower/pd_upper. Other page types do. Hence,
* we need to apply masking for those pages.
*/
if (opaque->flags != GIN_META)
{
/*
* For GIN_DELETED page, the page is initialized to empty. Hence, mask
* the page content.
*/
if (opaque->flags & GIN_DELETED)
mask_page_content(page);
else
mask_unused_space(page);
}
}
/*
* Mask a btree page before performing consistency checks on it.
*/
void
btree_mask(char *pagedata, BlockNumber blkno)
{
Page page = (Page) pagedata;
BTPageOpaque maskopaq;
mask_page_lsn_and_checksum(page);
mask_page_hint_bits(page);
mask_unused_space(page);
maskopaq = (BTPageOpaque) PageGetSpecialPointer(page);
if (P_ISDELETED(maskopaq))
{
/*
* Mask page content on a DELETED page since it will be re-initialized
* during replay. See btree_xlog_unlink_page() for details.
*/
mask_page_content(page);
}
else if (P_ISLEAF(maskopaq))
{
/*
* In btree leaf pages, it is possible to modify the LP_FLAGS without
* emitting any WAL record. Hence, mask the line pointer flags. See
* _bt_killitems(), _bt_check_unique() for details.
*/
mask_lp_flags(page);
}
/*
* BTP_HAS_GARBAGE is just an un-logged hint bit. So, mask it. See
* _bt_killitems(), _bt_check_unique() for details.
*/
maskopaq->btpo_flags &= ~BTP_HAS_GARBAGE;
/*
* During replay of a btree page split, we don't set the BTP_SPLIT_END
* flag of the right sibling and initialize the cycle_id to 0 for the same
* page. See btree_xlog_split() for details.
*/
maskopaq->btpo_flags &= ~BTP_SPLIT_END;
maskopaq->btpo_cycleid = 0;
}
/*
* Mask a hash page before performing consistency checks on it.
*/
void
hash_mask(char *pagedata, BlockNumber blkno)
{
Page page = (Page) pagedata;
HashPageOpaque opaque;
mask_page_lsn(page);
mask_page_hint_bits(page);
mask_unused_space(page);
opaque = (HashPageOpaque) PageGetSpecialPointer(page);
if (opaque->hasho_flag & LH_UNUSED_PAGE)
{
/*
* Mask everything on a UNUSED page.
*/
mask_page_content(page);
}
else if ((opaque->hasho_flag & LH_BUCKET_PAGE) ||
(opaque->hasho_flag & LH_OVERFLOW_PAGE))
{
/*
* In hash bucket and overflow pages, it is possible to modify the
* LP_FLAGS without emitting any WAL record. Hence, mask the line
* pointer flags. See hashgettuple(), _hash_kill_items() for details.
*/
mask_lp_flags(page);
}
/*
* It is possible that the hint bit LH_PAGE_HAS_DEAD_TUPLES may remain
* unlogged. So, mask it. See _hash_kill_items() for details.
*/
opaque->hasho_flag &= ~LH_PAGE_HAS_DEAD_TUPLES;
}