"Takayuki Tsunakawa" <[EMAIL PROTECTED]> writes:
> BTW, why does the bgwriter try to open and write the pages of already
> dropped relations?

It does not; the problem is with stale fsync requests.

> If the relation being dropeed has
> already been registered in the list of files to be fsynced, isn't it
> possible to remove the file from the list before unlinking the file,
> asking bgwriter in a similar way as ForwardFsyncRequest()?

I suggested that here
http://archives.postgresql.org/pgsql-hackers/2007-01/msg00642.php
but have received no feedback about it ...

                        regards, tom lane

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