1 files changed, 115 insertions, 0 deletions
diff --git a/storage/maria/ma_loghandler_lsn.h b/storage/maria/ma_loghandler_lsn.h
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+++ b/storage/maria/ma_loghandler_lsn.h
@@ -0,0 +1,115 @@
+/* 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