Commit082aca9

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Fix PageGetExactFreeSpace() so that it actually behaves sensibly

if pd_lower > pd_upper, rather than merely claiming to. This wouldonly matter if the page header were corrupt, which shouldn't occur,but ...

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Lines changed: 4 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -8,7 +8,7 @@`
`8`	`8`	`*`
`9`	`9`	`*`
`10`	`10`	`* IDENTIFICATION`
`11`		`- * $PostgreSQL: pgsql/src/backend/storage/page/bufpage.c,v 1.77 2008/01/01 19:45:52 momjian Exp $`
	`11`	`+ * $PostgreSQL: pgsql/src/backend/storage/page/bufpage.c,v 1.78 2008/02/10 20:39:08 tgl Exp $`
`12`	`12`	`*`
`13`	`13`	`*-------------------------------------------------------------------------`
`14`	`14`	`*/`
`@@ -489,6 +489,9 @@ PageGetExactFreeSpace(Page page)`
`489`	`489`	`space= (int) ((PageHeader)page)->pd_upper-`
`490`	`490`	`(int) ((PageHeader)page)->pd_lower;`
`491`	`491`
	`492`	`+if (space<0)`
	`493`	`+return0;`
	`494`	`+`
`492`	`495`	`return (Size)space;`
`493`	`496`	`}`
`494`	`497`

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