where are the getting buf data from disk really done?

From: sunpeng <bluevaley(at)gmail(dot)com>
To: pgsql-general(at)postgresql(dot)org
Cc: noue(at)tpf(dot)co(dot)jp
Subject: where are the getting buf data from disk really done?
Date: 2010-04-20 00:34:26
Message-ID: h2o46cc57ac1004191734r4f8757e6xeaf4dee2a99ba5ee@mail.gmail.com
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I noticed at the function StartBufferIO() in bufmgr.c, there is no really
getting buffer data from disk, only set InProgressBuf = buf; and return
true;
i wondered where is the getting buf data from disk really done?
are there a background process to do this work? which function does this
work?
thanks!

peng

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