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| author | Noah Misch <noah@leadboat.com> | 2020-03-21 09:38:26 -0700 |
|---|---|---|
| committer | Noah Misch <noah@leadboat.com> | 2020-03-21 09:38:35 -0700 |
| commit | 978da2a95597c97c52b14a27ba29873051ffc59d (patch) | |
| tree | 77dd257401417baa79df53b8e3736b0bb16ec145 /src/backend/access/gist/gistxlog.c | |
| parent | 96dffcdd5bae39fc6ffdd968a9d24b70ee8495b0 (diff) | |
| download | postgresql-978da2a95597c97c52b14a27ba29873051ffc59d.tar.gz postgresql-978da2a95597c97c52b14a27ba29873051ffc59d.zip | |
During heap rebuild, lock any TOAST index until end of transaction.
swap_relation_files() calls toast_get_valid_index() to find and lock
this index, just before swapping with the rebuilt TOAST index. The
latter function releases the lock before returning. Potential for
mischief is low; a concurrent session can issue ALTER INDEX ... SET
(fillfactor = ...), which is not alarming. Nonetheless, changing
pg_class.relfilenode without a lock is unconventional. Back-patch to
9.5 (all supported versions), because another fix needs this.
Discussion: https://postgr.es/m/20191226001521.GA1772687@rfd.leadboat.com
Diffstat (limited to 'src/backend/access/gist/gistxlog.c')
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