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Before performing checks on an index, we need to take some safety measures that apply to all index AMs. This includes: * verifying that the index can be checked - Only selected AMs are supported by amcheck (right now only B-Tree). The index has to be valid and not a temporary index from another session. * changing (and then restoring) user's security context * obtaining proper locks on the index (and table, if needed) * discarding GUC changes from the index functions Until now this was implemented in the B-Tree amcheck module, but it's something every AM will have to do. So relocate the code into a new module verify_common for reuse. The shared steps are implemented by amcheck_lock_relation_and_check(), receiving the AM-specific verification as a callback. Custom parameters may be supplied using a pointer. Author: Andrey Borodin <amborodin@acm.org> Reviewed-By: José Villanova <jose.arthur@gmail.com> Reviewed-By: Aleksander Alekseev <aleksander@timescale.com> Reviewed-By: Nikolay Samokhvalov <samokhvalov@gmail.com> Reviewed-By: Andres Freund <andres@anarazel.de> Reviewed-By: Tomas Vondra <tomas@vondra.me> Reviewed-By: Mark Dilger <mark.dilger@enterprisedb.com> Reviewed-By: Peter Geoghegan <pg@bowt.ie> Reviewed-By: Kirill Reshke <reshkekirill@gmail.com> Discussion: https://postgr.es/m/45AC9B0A-2B45-40EE-B08F-BDCF5739D1E1%40yandex-team.ru
32 lines
950 B
C
32 lines
950 B
C
/*-------------------------------------------------------------------------
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*
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* amcheck.h
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* Shared routines for amcheck verifications.
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*
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* Copyright (c) 2016-2025, PostgreSQL Global Development Group
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*
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* IDENTIFICATION
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* contrib/amcheck/amcheck.h
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*
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*-------------------------------------------------------------------------
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*/
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#include "storage/bufpage.h"
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#include "storage/lmgr.h"
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#include "storage/lockdefs.h"
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#include "utils/relcache.h"
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#include "miscadmin.h"
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/* Typedefs for callback functions for amcheck_lock_relation */
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typedef void (*IndexCheckableCallback) (Relation index);
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typedef void (*IndexDoCheckCallback) (Relation rel,
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Relation heaprel,
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void *state,
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bool readonly);
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extern void amcheck_lock_relation_and_check(Oid indrelid,
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Oid am_id,
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IndexDoCheckCallback check,
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LOCKMODE lockmode, void *state);
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extern bool index_checkable(Relation rel, Oid am_id);
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