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Scanning pg_tablespace from walsender

From: Magnus Hagander <magnus(at)hagander(dot)net>
To: PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Scanning pg_tablespace from walsender
Date: 2011-01-03 15:25:28
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Lists: pgsql-hackers
I'm working on completing Heikki's patch for streaming base backups,
and have run into a problem:

In order to dump all tablespaces properly, I have to know where they
are (d'uh). In order to do that, I need to scan pg_tablespace.
However, scanning that from walsender gives me:

FATAL:  cannot read pg_class without having selected a database

Which means I somehow have to get pg_tablespace into the cache without
reading pg_class, I guess. Similar to how we do for pg_database for

Can someone throw me a pointer or two on how to actually do that? :-)
Am I correct in assuming I need to add it to
RelationCacheInitializePhase2(), and to do that, need to figure out
how to define a TableSpaceRelation_Rowtype_Id in the headers? Or is
there an easier way I'm missing?

 Magnus Hagander


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Subject: Re: Scanning pg_tablespace from walsender
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