diff options
Diffstat (limited to 'storage/innobase/include/buf0checksum.h')
| -rw-r--r-- | storage/innobase/include/buf0checksum.h | 38 |
1 files changed, 16 insertions, 22 deletions
diff --git a/storage/innobase/include/buf0checksum.h b/storage/innobase/include/buf0checksum.h index 9405251dc74..20955a5b2e6 100644 --- a/storage/innobase/include/buf0checksum.h +++ b/storage/innobase/include/buf0checksum.h @@ -1,6 +1,7 @@ /***************************************************************************** Copyright (c) 1995, 2016, Oracle and/or its affiliates. All Rights Reserved. +Copyright (c) 2017, MariaDB Corporation. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software @@ -30,7 +31,7 @@ Created Aug 11, 2011 Vasil Dimov #include "buf0types.h" -/** Calculates the CRC32 checksum of a page. The value is stored to the page +/** Calculate the CRC32 checksum of a page. The value is stored to the page when it is written to a file and also checked for a match when reading from the file. When reading we allow both normal CRC32 and CRC-legacy-big-endian variants. Note that we must be careful to calculate the same value on 32-bit @@ -44,37 +45,30 @@ buf_calc_page_crc32( const byte* page, bool use_legacy_big_endian = false); -/********************************************************************//** -Calculates a page checksum which is stored to the page when it is written +/** Calculate a checksum which is stored to the page when it is written to a file. Note that we must be careful to calculate the same value on 32-bit and 64-bit architectures. +@param[in] page file page (srv_page_size bytes) @return checksum */ -ulint -buf_calc_page_new_checksum( -/*=======================*/ - const byte* page); /*!< in: buffer page */ - -/********************************************************************//** -In versions < 4.0.14 and < 4.1.1 there was a bug that the checksum only -looked at the first few bytes of the page. This calculates that old -checksum. +uint32_t +buf_calc_page_new_checksum(const byte* page); + +/** In MySQL before 4.0.14 or 4.1.1 there was an InnoDB bug that +the checksum only looked at the first few bytes of the page. +This calculates that old checksum. NOTE: we must first store the new formula checksum to FIL_PAGE_SPACE_OR_CHKSUM before calculating and storing this old checksum because this takes that field as an input! +@param[in] page file page (srv_page_size bytes) @return checksum */ -ulint -buf_calc_page_old_checksum( -/*=======================*/ - const byte* page); /*!< in: buffer page */ - +uint32_t +buf_calc_page_old_checksum(const byte* page); -/********************************************************************//** -Return a printable string describing the checksum algorithm. +/** Return a printable string describing the checksum algorithm. +@param[in] algo algorithm @return algorithm name */ const char* -buf_checksum_algorithm_name( -/*========================*/ - srv_checksum_algorithm_t algo); /*!< in: algorithm */ +buf_checksum_algorithm_name(srv_checksum_algorithm_t algo); extern ulong srv_checksum_algorithm; extern bool legacy_big_endian_checksum; |