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Rewrite the FSM. Instead of relying on a fixed-size shared memory seg…
…ment, 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.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| /*------------------------------------------------------------------------- | ||
| * | ||
| * fsmfuncs.c | ||
| * Functions to investigate FSM pages | ||
| * | ||
| * These functions are restricted to superusers for the fear of introducing | ||
| * security holes if the input checking isn't as water-tight as it should. | ||
| * You'd need to be superuser to obtain a raw page image anyway, so | ||
| * there's hardly any use case for using these without superuser-rights | ||
| * anyway. | ||
| * | ||
| * Copyright (c) 2007-2008, PostgreSQL Global Development Group | ||
| * | ||
| * IDENTIFICATION | ||
| * $PostgreSQL: pgsql/contrib/pageinspect/fsmfuncs.c,v 1.1 2008/09/30 10:52:09 heikki Exp $ | ||
| * | ||
| *------------------------------------------------------------------------- | ||
| */ | ||
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| #include "postgres.h" | ||
| #include "lib/stringinfo.h" | ||
| #include "storage/fsm_internals.h" | ||
| #include "utils/builtins.h" | ||
| #include "miscadmin.h" | ||
| #include "funcapi.h" | ||
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| Datum fsm_page_contents(PG_FUNCTION_ARGS); | ||
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| /* | ||
| * Dumps the contents of a FSM page. | ||
| */ | ||
| PG_FUNCTION_INFO_V1(fsm_page_contents); | ||
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| Datum | ||
| fsm_page_contents(PG_FUNCTION_ARGS) | ||
| { | ||
| bytea *raw_page = PG_GETARG_BYTEA_P(0); | ||
| int raw_page_size; | ||
| StringInfoData sinfo; | ||
| FSMPage fsmpage; | ||
| int i; | ||
|
|
||
| if (!superuser()) | ||
| ereport(ERROR, | ||
| (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE), | ||
| (errmsg("must be superuser to use raw page functions")))); | ||
|
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| raw_page_size = VARSIZE(raw_page) - VARHDRSZ; | ||
| fsmpage = (FSMPage) PageGetContents(VARDATA(raw_page)); | ||
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| initStringInfo(&sinfo); | ||
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| for(i=0; i < NodesPerPage; i++) | ||
| { | ||
| if (fsmpage->fp_nodes[i] != 0) | ||
| appendStringInfo(&sinfo, "%d: %d\n", i, fsmpage->fp_nodes[i]); | ||
| } | ||
| appendStringInfo(&sinfo, "fp_next_slot: %d\n", fsmpage->fp_next_slot); | ||
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| PG_RETURN_TEXT_P(cstring_to_text(sinfo.data)); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,44 +1,26 @@ | ||
| /* $PostgreSQL: pgsql/contrib/pg_freespacemap/pg_freespacemap.sql.in,v 1.8 2007/11/13 04:24:28 momjian Exp $ */ | ||
| /* $PostgreSQL: pgsql/contrib/pg_freespacemap/pg_freespacemap.sql.in,v 1.9 2008/09/30 10:52:09 heikki Exp $ */ | ||
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| -- Adjust this setting to control where the objects get created. | ||
| SET search_path = public; | ||
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| -- Register the functions. | ||
| CREATE OR REPLACE FUNCTION pg_freespacemap_pages() | ||
| RETURNS SETOF RECORD | ||
| AS 'MODULE_PATHNAME', 'pg_freespacemap_pages' | ||
| -- Register the C function. | ||
| CREATE OR REPLACE FUNCTION pg_freespace(regclass, int4) | ||
| RETURNS int2 | ||
| AS 'MODULE_PATHNAME', 'pg_freespace' | ||
| LANGUAGE C; | ||
|
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| CREATE OR REPLACE FUNCTION pg_freespacemap_relations() | ||
| -- pg_freespace shows the recorded space avail at each block in a relation | ||
| CREATE OR REPLACE FUNCTION | ||
| pg_freespace(rel regclass, blkno OUT int4, avail OUT int2) | ||
| RETURNS SETOF RECORD | ||
| AS 'MODULE_PATHNAME', 'pg_freespacemap_relations' | ||
| LANGUAGE C; | ||
| AS $$ | ||
| SELECT blkno::int4, pg_freespace($1, blkno::int4) AS avail | ||
| FROM generate_series(0, pg_relation_size($1) / current_setting('block_size')::bigint - 1) AS blkno; | ||
| $$ | ||
| LANGUAGE SQL; | ||
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| -- Create views for convenient access. | ||
| CREATE VIEW pg_freespacemap_pages AS | ||
| SELECT P.* FROM pg_freespacemap_pages() AS P | ||
| (reltablespace oid, | ||
| reldatabase oid, | ||
| relfilenode oid, | ||
| relblocknumber bigint, | ||
| bytes integer); | ||
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| CREATE VIEW pg_freespacemap_relations AS | ||
| SELECT P.* FROM pg_freespacemap_relations() AS P | ||
| (reltablespace oid, | ||
| reldatabase oid, | ||
| relfilenode oid, | ||
| avgrequest integer, | ||
| interestingpages integer, | ||
| storedpages integer, | ||
| nextpage integer); | ||
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| -- Don't want these to be available to public. | ||
| REVOKE ALL ON FUNCTION pg_freespacemap_pages() FROM PUBLIC; | ||
| REVOKE ALL ON pg_freespacemap_pages FROM PUBLIC; | ||
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| REVOKE ALL ON FUNCTION pg_freespacemap_relations() FROM PUBLIC; | ||
| REVOKE ALL ON pg_freespacemap_relations FROM PUBLIC; | ||
| REVOKE ALL ON FUNCTION pg_freespace(regclass, int4) FROM PUBLIC; | ||
| REVOKE ALL ON FUNCTION pg_freespace(regclass) FROM PUBLIC; |
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