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/* Copyright (C) 2007 MySQL AB & Sanja Belkin
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 Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */
#ifndef _ma_loghandler_lsn_h
#define _ma_loghandler_lsn_h
/*
Transaction log record address:
file_no << 32 | offset
file_no is only 3 bytes so we can use signed integer to make
comparison simpler.
*/
typedef int64 TRANSLOG_ADDRESS;
/*
Compare addresses
A1 > A2 -> result > 0
A1 == A2 -> 0
A1 < A2 -> result < 0
*/
#define cmp_translog_addr(A1,A2) ((A1) - (A2))
/*
TRANSLOG_ADDRESS is just address of some byte in the log (usually some
chunk)
LSN used where address of some record in the log needed (not just any
address)
*/
typedef TRANSLOG_ADDRESS LSN;
/* Gets file number part of a LSN/log address */
#define LSN_FILE_NO(L) (uint32) ((L) >> 32)
/* Gets raw file number part of a LSN/log address */
#define LSN_FILE_NO_PART(L) ((L) & ((int64)0xFFFFFF00000000LL))
/* Parts of LSN for printing */
#define LSN_IN_PARTS(L) (uint)LSN_FILE_NO(L),(uint)LSN_OFFSET(L)
#define LSN_FMT "(%u,0x%x)"
/* Gets record offset of a LSN/log address */
#define LSN_OFFSET(L) (ulong) ((L) & 0xFFFFFFFFL)
/* Makes lsn/log address from file number and record offset */
#define MAKE_LSN(F,S) ((LSN) ((((uint64)(F)) << 32) | (S)))
/* checks LSN */
#define LSN_VALID(L) \
((LSN_FILE_NO_PART(L) != FILENO_IMPOSSIBLE) && \
(LSN_OFFSET(L) != LOG_OFFSET_IMPOSSIBLE))
/* size of stored LSN on a disk, don't change it! */
#define LSN_STORE_SIZE 7
/* Puts LSN into buffer (dst) */
#define lsn_store(dst, lsn) \
do { \
int3store((dst), LSN_FILE_NO(lsn)); \
int4store((char*)(dst) + 3, LSN_OFFSET(lsn)); \
} while (0)
/* Unpacks LSN from the buffer (P) */
#define lsn_korr(P) MAKE_LSN(uint3korr(P), uint4korr((const char*)(P) + 3))
/* what we need to add to LSN to increase it on one file */
#define LSN_ONE_FILE ((int64)0x100000000LL)
#define LSN_REPLACE_OFFSET(L, S) (LSN_FILE_NO_PART(L) | (S))
/*
an 8-byte type whose most significant uchar is used for "flags"; 7
other bytes are a LSN.
*/
typedef LSN LSN_WITH_FLAGS;
#define LSN_WITH_FLAGS_TO_LSN(x) (x & 0x00FFFFFFFFFFFFFFULL)
#define LSN_WITH_FLAGS_TO_FLAGS(x) (x & 0xFF00000000000000ULL)
#define FILENO_IMPOSSIBLE 0 /**< log file's numbering starts at 1 */
#define LOG_OFFSET_IMPOSSIBLE 0 /**< log always has a header */
#define LSN_IMPOSSIBLE ((LSN)0)
/* following LSN also is impossible */
#define LSN_ERROR ((LSN)1)
/** @brief some impossible LSN serve as markers */
/**
When table is modified by maria_chk, or auto-zerofilled, old REDOs don't
apply, table is freshly born again somehow: its state's LSNs need to be
updated to the new instance which receives this table.
*/
#define LSN_NEEDS_NEW_STATE_LSNS ((LSN)2)
/**
@brief the maximum valid LSN.
Unlike ULONGLONG_MAX, it can be safely used in comparison with valid LSNs
(ULONGLONG_MAX is too big for correctness of cmp_translog_addr()).
*/
#define LSN_MAX (LSN)0x00FFFFFFFFFFFFFFULL
/* Max LSN error to print on check or recovery */
#define MAX_LSN_ERRORS 10
#endif
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