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Clean up the use of some page-header-access macros: principally, use

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SizeOfPageHeaderData instead of sizeof(PageHeaderData) in places where that
makes the code clearer, and avoid casting between Page and PageHeader where
possible.  Zdenek Kotala, with some additional cleanup by Heikki Linnakangas.

I did not apply the parts of the proposed patch that would have resulted in
slightly changing the on-disk format of hash indexes; it seems to me that's
not a win as long as there's any chance of having in-place upgrade for 8.4.
This commit is contained in:
Tom Lane
2008-07-13 20:45:47 +00:00
parent 45efb09a01
commit 9d035f4254
17 changed files with 96 additions and 104 deletions
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14
src/include/access/htup.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/htup.h,v 1.99 2008/05/12 00:00:53 alvherre Exp $
* $PostgreSQL: pgsql/src/include/access/htup.h,v 1.100 2008/07/13 20:45:47 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -362,12 +362,12 @@ do { \
* other stuff that has to be on a disk page. Since heap pages use no
* "special space", there's no deduction for that.
*
* NOTE: we do not need to count an ItemId for the tuple because
* sizeof(PageHeaderData) includes the first ItemId on the page. But beware
* of assuming that, say, you can fit 2 tuples of size MaxHeapTupleSize/2
* on the same page.
* NOTE: we allow for the ItemId that must point to the tuple, ensuring that
* an otherwise-empty page can indeed hold a tuple of this size. Because
* ItemIds and tuples have different alignment requirements, don't assume that
* you can, say, fit 2 tuples of size MaxHeapTupleSize/2 on the same page.
*/
#define MaxHeapTupleSize (BLCKSZ - MAXALIGN(sizeof(PageHeaderData)))
#define MaxHeapTupleSize (BLCKSZ - MAXALIGN(SizeOfPageHeaderData + sizeof(ItemIdData)))
/*
* MaxHeapTuplesPerPage is an upper bound on the number of tuples that can
@@ -381,7 +381,7 @@ do { \
* require increases in the size of work arrays.
*/
#define MaxHeapTuplesPerPage \
((int) ((BLCKSZ - offsetof(PageHeaderData, pd_linp)) / \
((int) ((BLCKSZ - SizeOfPageHeaderData) / \
(MAXALIGN(offsetof(HeapTupleHeaderData, t_bits)) + sizeof(ItemIdData))))
/*