xref: /src/share/examples/puffs/pgfs/fix.sql

-- $NetBSD: fix.sql,v 1.3 2025/05/19 06:16:24 andvar Exp $

-- Copyright (c)2011 YAMAMOTO Takashi,
-- All rights reserved.
--
-- Redistribution and use in source and binary forms, with or without
-- modification, are permitted provided that the following conditions
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-- 1. Redistributions of source code must retain the above copyright
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-- 2. Redistributions in binary form must reproduce the above copyright
--    notice, this list of conditions and the following disclaimer in the
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-- THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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-- remove orphaned files unless there's mount_pgfs connected to this db

BEGIN;
SET TRANSACTION ISOLATION LEVEL REPEATABLE READ;
SET search_path TO pgfs;
WITH
pgfs_clients AS (SELECT -count(*) FROM pg_stat_activity WHERE
	application_name = 'pgfs' AND datid IN (SELECT oid FROM pg_database
	WHERE datname = current_database())),
files_to_remove AS (DELETE FROM file WHERE nlink IN (SELECT * FROM pgfs_clients)
	RETURNING fileid),
removed_files AS (DELETE FROM datafork WHERE fileid IN (SELECT * FROM
	files_to_remove) RETURNING fileid, loid)
SELECT fileid AS "orphaned files" FROM removed_files WHERE lo_unlink(loid) = 1;
COMMIT;