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src/include/storage/checksum.h
40 строк
1 KB
Daniel Gustafsson
Online enabling and disabling of data checksums
03 апр 2026, 23:58
03 апр 2026, 23:58
f19c0ec
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/*------------------------------------------------------------------------- * * checksum.h * Checksum implementation for data pages. * * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * src/include/storage/checksum.h * *------------------------------------------------------------------------- */ #ifndef CHECKSUM_H #define CHECKSUM_H #include "storage/block.h" /* * Checksum state 0 is used for when data checksums are disabled (OFF). * PG_DATA_CHECKSUM_INPROGRESS_{ON|OFF} defines that data checksums are either * currently being enabled or disabled, and PG_DATA_CHECKSUM_VERSION defines * that data checksums are enabled. The ChecksumStateType is stored in * pg_control so changing requires a catversion bump, and the values cannot * be reordered. New states must be added at the end. */ typedef enum ChecksumStateType { PG_DATA_CHECKSUM_OFF = 0, PG_DATA_CHECKSUM_VERSION = 1, PG_DATA_CHECKSUM_INPROGRESS_OFF = 2, PG_DATA_CHECKSUM_INPROGRESS_ON = 3, } ChecksumStateType; /* * Compute the checksum for a Postgres page. The page must be aligned on a * 4-byte boundary. */ extern uint16 pg_checksum_page(char *page, BlockNumber blkno); #endif /* CHECKSUM_H */