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Allow "in place" tablespaces.

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This is a backpatch to branches 10-14 of the following commits:

7170f2159f Allow "in place" tablespaces.
c6f2f01611 Fix pg_basebackup with in-place tablespaces.
f6f0db4d62 Fix pg_tablespace_location() with in-place tablespaces
7a7cd84893 doc: Remove mention to in-place tablespaces for pg_tablespace_location()
5344723755 Remove unnecessary Windows-specific basebackup code.

In-place tablespaces were introduced as a testing helper mechanism, but
they are going to be used for a bugfix in WAL replay to be backpatched
to all stable branches.

I (Álvaro) had to adjust some code to account for lack of
get_dirent_type() in branches prior to 14.

Author: Thomas Munro <thomas.munro@gmail.com>
Author: Michaël Paquier <michael@paquier.xyz>
Author: Álvaro Herrera <alvherre@alvh.no-ip.org>
Discussion: https://postgr.es/m/20220722081858.omhn2in5zt3g4nek@alvherre.pgsql
This commit is contained in:
Alvaro Herrera
2022-07-27 07:55:12 +02:00
parent 968b89257b
commit ca347f5433
6 changed files with 114 additions and 7 deletions
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19
doc/src/sgml/config.sgml
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@ -9610,6 +9610,25 @@ dynamic_library_path = 'C:\tools\postgresql;H:\my_project\lib;$libdir'
</para>
<variablelist>
<varlistentry id="guc-allow-in-place-tablespaces" xreflabel="allow_in_place_tablespaces">
<term><varname>allow_in_place_tablespaces</varname> (<type>boolean</type>)
<indexterm>
<primary><varname>allow_in_place_tablespaces</varname> configuration parameter</primary>
</indexterm>
</term>
<listitem>
<para>
Allows tablespaces to be created as directories inside
<filename>pg_tblspc</filename>, when an empty location string
is provided to the <command>CREATE TABLESPACE</command> command. This
is intended to allow testing replication scenarios where primary and
standby servers are running on the same machine. Such directories
are likely to confuse backup tools that expect to find only symbolic
links in that location. Only superusers can change this setting.
</para>
</listitem>
</varlistentry>
<varlistentry id="guc-allow-system-table-mods" xreflabel="allow_system_table_mods">
<term><varname>allow_system_table_mods</varname> (<type>boolean</type>)
<indexterm>