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storage/maria/ma_loghandler.c: The function comment fixed. storage/maria/ma_loghandler_lsn.h: Comment of LSN/TRANSLOG_ADDRESS type fixed
56 lines
1.5 KiB
C
56 lines
1.5 KiB
C
#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 more simple.
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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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/* LSN type (address of certain log record chank */
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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) ((L) >> 32)
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/* Gets raw file number part of a LSN/log address */
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#define LSN_FINE_NO_PART(L) ((L) & ((int64)0xFFFFFF00000000LL))
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/* Gets record offset of a LSN/log address */
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#define LSN_OFFSET(L) ((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) ((((uint64)(F)) << 32) | (S))
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/* checks LSN */
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#define LSN_VALID(L) DBUG_ASSERT((L) >= 0 && (L) < (uint64)0xFFFFFFFFFFFFFFLL)
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/* size of stored LSN on a disk */
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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((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((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_FINE_NO_PART(L) | (S))
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#endif
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