/* * pgstat_hash_page -- check tuples in a hash page */ static void pgstat_hash_page(pgstattuple_type *stat, Relation rel, BlockNumber blkno, BufferAccessStrategy bstrategy) { Buffer buf; Page page; _hash_getlock(rel, blkno, HASH_SHARE); buf = _hash_getbuf_with_strategy(rel, blkno, HASH_READ, 0, bstrategy); page = BufferGetPage(buf); if (PageGetSpecialSize(page) == MAXALIGN(sizeof(HashPageOpaqueData))) { HashPageOpaque opaque; opaque = (HashPageOpaque) PageGetSpecialPointer(page); switch (opaque->hasho_flag) { case LH_UNUSED_PAGE: stat->free_space += BLCKSZ; break; case LH_BUCKET_PAGE: case LH_OVERFLOW_PAGE: pgstat_index_page(stat, page, FirstOffsetNumber, PageGetMaxOffsetNumber(page)); break; case LH_BITMAP_PAGE: case LH_META_PAGE: default: break; } } else { /* maybe corrupted */ } _hash_relbuf(rel, buf); _hash_droplock(rel, blkno, HASH_SHARE); }
/* * pgstat_btree_page -- check tuples in a btree page */ static void pgstat_btree_page(pgstattuple_type *stat, Relation rel, BlockNumber blkno, BufferAccessStrategy bstrategy) { Buffer buf; Page page; buf = ReadBufferExtended(rel, MAIN_FORKNUM, blkno, RBM_NORMAL, bstrategy); LockBuffer(buf, BT_READ); page = BufferGetPage(buf); /* Page is valid, see what to do with it */ if (PageIsNew(page)) { /* fully empty page */ stat->free_space += BLCKSZ; } else { BTPageOpaque opaque; opaque = (BTPageOpaque) PageGetSpecialPointer(page); if (opaque->btpo_flags & (BTP_DELETED | BTP_HALF_DEAD)) { /* recyclable page */ stat->free_space += BLCKSZ; } else if (P_ISLEAF(opaque)) { pgstat_index_page(stat, page, P_FIRSTDATAKEY(opaque), PageGetMaxOffsetNumber(page)); } else { /* root or node */ } } _bt_relbuf(rel, buf); }
/* * pgstat_gist_page -- check tuples in a gist page */ static void pgstat_gist_page(pgstattuple_type *stat, Relation rel, BlockNumber blkno) { Buffer buf; Page page; buf = ReadBuffer(rel, blkno); LockBuffer(buf, GIST_SHARE); gistcheckpage(rel, buf); page = BufferGetPage(buf); if (GistPageIsLeaf(page)) { pgstat_index_page(stat, page, FirstOffsetNumber, PageGetMaxOffsetNumber(page)); } else { /* root or node */ } UnlockReleaseBuffer(buf); }
/* * pgstat_gist_page -- check tuples in a gist page */ static void pgstat_gist_page(pgstattuple_type *stat, Relation rel, BlockNumber blkno, BufferAccessStrategy bstrategy) { Buffer buf; Page page; buf = ReadBufferExtended(rel, MAIN_FORKNUM, blkno, RBM_NORMAL, bstrategy); LockBuffer(buf, GIST_SHARE); gistcheckpage(rel, buf); page = BufferGetPage(buf); if (GistPageIsLeaf(page)) { pgstat_index_page(stat, page, FirstOffsetNumber, PageGetMaxOffsetNumber(page)); } else { /* root or node */ } UnlockReleaseBuffer(buf); }