Rewrite the FSM. Instead of relying on a fixed-size shared memory segment, the

free space information is stored in a dedicated FSM relation fork, with each
relation (except for hash indexes; they don't use FSM).

This eliminates the max_fsm_relations and max_fsm_pages GUC options; remove any
trace of them from the backend, initdb, and documentation.

Rewrite contrib/pg_freespacemap to match the new FSM implementation. Also
introduce a new variant of the get_raw_page(regclass, int4, int4) function in
contrib/pageinspect that let's you to return pages from any relation fork, and
a new fsm_page_contents() function to inspect the new FSM pages.

1 files changed, 15 insertions, 2 deletions

diff --git a/contrib/pageinspect/pageinspect.sql.in b/contrib/pageinspect/pageinspect.sql.in
index 1af59f70f46..49fea9eb51f 100644
--- a/contrib/pageinspect/pageinspect.sql.in
+++ b/contrib/pageinspect/pageinspect.sql.in
@@ -1,4 +1,4 @@
-/* $PostgreSQL: pgsql/contrib/pageinspect/pageinspect.sql.in,v 1.4 2007/11/13 04:24:28 momjian Exp $ */
+/* $PostgreSQL: pgsql/contrib/pageinspect/pageinspect.sql.in,v 1.5 2008/09/30 10:52:09 heikki Exp $ */
 
 -- Adjust this setting to control where the objects get created.
 SET search_path = public;
@@ -6,11 +6,16 @@ SET search_path = public;
 --
 -- get_raw_page()
 --
-CREATE OR REPLACE FUNCTION get_raw_page(text, int4)
+CREATE OR REPLACE FUNCTION get_raw_page(text, int4, int4)
 RETURNS bytea
 AS 'MODULE_PATHNAME', 'get_raw_page'
 LANGUAGE C STRICT;
 
+CREATE OR REPLACE FUNCTION get_raw_page(text, int4) 
+RETURNS bytea
+AS $$ SELECT get_raw_page($1, 0, $2); $$
+LANGUAGE SQL STRICT;
+
 --
 -- page_header()
 --
@@ -92,3 +97,11 @@ CREATE OR REPLACE FUNCTION bt_page_items(IN relname text, IN blkno int4,
 RETURNS SETOF record
 AS 'MODULE_PATHNAME', 'bt_page_items'
 LANGUAGE C STRICT;
+
+--
+-- fsm_page_contents()
+--
+CREATE OR REPLACE FUNCTION fsm_page_contents(IN page bytea)
+RETURNS text
+AS 'MODULE_PATHNAME', 'fsm_page_contents'
+LANGUAGE C STRICT;