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112 lines
3.6 KiB
C
112 lines
3.6 KiB
C
/* Copyright (C) 2007 MySQL AB & Sanja Belkin
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */
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#ifndef _ma_loghandler_lsn_h
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#define _ma_loghandler_lsn_h
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/*
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Transaction log record address:
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file_no << 32 | offset
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file_no is only 3 bytes so we can use signed integer to make
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comparison simpler.
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*/
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typedef int64 TRANSLOG_ADDRESS;
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/*
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Compare addresses
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A1 > A2 -> result > 0
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A1 == A2 -> 0
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A1 < A2 -> result < 0
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*/
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#define cmp_translog_addr(A1,A2) ((A1) - (A2))
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/*
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TRANSLOG_ADDRESS is just address of some byte in the log (usually some
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chunk)
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LSN used where address of some record in the log needed (not just any
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address)
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*/
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typedef TRANSLOG_ADDRESS LSN;
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/* Gets file number part of a LSN/log address */
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#define LSN_FILE_NO(L) (uint32) ((L) >> 32)
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/* Gets raw file number part of a LSN/log address */
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#define LSN_FILE_NO_PART(L) ((L) & ((int64)0xFFFFFF00000000LL))
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/* Parts of LSN for printing */
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#define LSN_IN_PARTS(L) (uint)LSN_FILE_NO(L),(uint)LSN_OFFSET(L)
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#define LSN_FMT "(%u,0x%x)"
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/* Gets record offset of a LSN/log address */
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#define LSN_OFFSET(L) (ulong) ((L) & 0xFFFFFFFFL)
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/* Makes lsn/log address from file number and record offset */
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#define MAKE_LSN(F,S) ((LSN) ((((uint64)(F)) << 32) | (S)))
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/* checks LSN */
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#define LSN_VALID(L) \
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((LSN_FILE_NO_PART(L) != FILENO_IMPOSSIBLE) && \
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(LSN_OFFSET(L) != LOG_OFFSET_IMPOSSIBLE))
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/* size of stored LSN on a disk, don't change it! */
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#define LSN_STORE_SIZE 7
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/* Puts LSN into buffer (dst) */
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#define lsn_store(dst, lsn) \
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do { \
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int3store((dst), LSN_FILE_NO(lsn)); \
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int4store((char*)(dst) + 3, LSN_OFFSET(lsn)); \
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} while (0)
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/* Unpacks LSN from the buffer (P) */
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#define lsn_korr(P) MAKE_LSN(uint3korr(P), uint4korr((const char*)(P) + 3))
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/* what we need to add to LSN to increase it on one file */
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#define LSN_ONE_FILE ((int64)0x100000000LL)
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#define LSN_REPLACE_OFFSET(L, S) (LSN_FILE_NO_PART(L) | (S))
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/*
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an 8-byte type whose most significant uchar is used for "flags"; 7
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other bytes are a LSN.
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*/
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typedef LSN LSN_WITH_FLAGS;
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#define LSN_WITH_FLAGS_TO_LSN(x) (x & 0x00FFFFFFFFFFFFFFULL)
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#define LSN_WITH_FLAGS_TO_FLAGS(x) (x & 0xFF00000000000000ULL)
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#define FILENO_IMPOSSIBLE 0 /**< log file's numbering starts at 1 */
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#define LOG_OFFSET_IMPOSSIBLE 0 /**< log always has a header */
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#define LSN_IMPOSSIBLE ((LSN)0)
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/* following LSN also is impossible */
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#define LSN_ERROR ((LSN)1)
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/** @brief some impossible LSN serve as markers */
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/**
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When table is modified by maria_chk, or auto-zerofilled, old REDOs don't
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apply, table is freshly born again somehow: its state's LSNs need to be
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updated to the new instance which receives this table.
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*/
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#define LSN_NEEDS_NEW_STATE_LSNS ((LSN)2)
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/**
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@brief the maximum valid LSN.
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Unlike ULONGLONG_MAX, it can be safely used in comparison with valid LSNs
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(ULONGLONG_MAX is too big for correctness of cmp_translog_addr()).
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*/
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#define LSN_MAX (LSN)0x00FFFFFFFFFFFFFFULL
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#endif
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