pgsql: Add a check to prevent overwriting valid data if smgrnblocks()

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From: tgl(at)postgresql(dot)org (Tom Lane)
To: pgsql-committers(at)postgresql(dot)org
Subject: pgsql: Add a check to prevent overwriting valid data if smgrnblocks()
Date: 2006-09-25 22:01:10
Message-ID: 20060925220110.76B6A9FB251@postgresql.org
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Log Message:
-----------
Add a check to prevent overwriting valid data if smgrnblocks() gives a
wrong answer, as has been seen to occur with a buggy Linux kernel. Not
really our bug, but it's a simple test in a seldom-used control path,
so might as well have a defense.

Modified Files:
--------------
pgsql/src/backend/storage/buffer:
bufmgr.c (r1.210 -> r1.211)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/storage/buffer/bufmgr.c.diff?r1=1.210&r2=1.211)