45f658dacb
Before this commit fsm_vacuum_page() modified the page without any lock on the page. Historically that was kind of ok, as we didn't rely on the freespace to really stay consistent and we did not have checksums. But these days pages are checksummed and there are ways for FSM pages to be included in WAL records, even if the FSM itself is still not WAL logged. If a FSM page ever were modified while a WAL record referenced that page, we'd be in trouble, as the WAL CRC could end up getting corrupted. The reason to address this right now is a series of patches with the goal to only allow modifications of pages with an appropriate lock level. Obviously not having any lock is not appropriate :) Reviewed-by: Kirill Reshke <reshkekirill@gmail.com> Discussion: https://postgr.es/m/4wggb7purufpto6x35fd2kwhasehnzfdy3zdcu47qryubs2hdz@fa5kannykekr Discussion: https://postgr.es/m/e6a8f734-2198-4958-a028-aba863d4a204@iki.fi
PostgreSQL Database Management System
This directory contains the source code distribution of the PostgreSQL database management system.
PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.