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/*****************************************************************************
Copyright (c) 1995, 2009, Innobase Oy. All Rights Reserved.
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., 59 Temple
Place, Suite 330, Boston, MA 02111-1307 USA
*****************************************************************************/
/**************************************************//**
@file include/mtr0log.ic
Mini-transaction logging routines
Created 12/7/1995 Heikki Tuuri
*******************************************************/
#include "mach0data.h"
#include "ut0lst.h"
#include "buf0buf.h"
#include "fsp0types.h"
#include "trx0sys.h"
/********************************************************//**
Opens a buffer to mlog. It must be closed with mlog_close.
@return buffer, NULL if log mode MTR_LOG_NONE */
UNIV_INLINE
byte*
mlog_open(
/*======*/
mtr_t* mtr, /*!< in: mtr */
ulint size) /*!< in: buffer size in bytes; MUST be
smaller than DYN_ARRAY_DATA_SIZE! */
{
dyn_array_t* mlog;
mtr->modifications = TRUE;
if (mtr_get_log_mode(mtr) == MTR_LOG_NONE) {
return(NULL);
}
mlog = &(mtr->log);
return(dyn_array_open(mlog, size));
}
/********************************************************//**
Closes a buffer opened to mlog. */
UNIV_INLINE
void
mlog_close(
/*=======*/
mtr_t* mtr, /*!< in: mtr */
byte* ptr) /*!< in: buffer space from ptr up was not used */
{
dyn_array_t* mlog;
ut_ad(mtr_get_log_mode(mtr) != MTR_LOG_NONE);
mlog = &(mtr->log);
dyn_array_close(mlog, ptr);
}
#ifndef UNIV_HOTBACKUP
/********************************************************//**
Catenates 1 - 4 bytes to the mtr log. The value is not compressed. */
UNIV_INLINE
void
mlog_catenate_ulint(
/*================*/
mtr_t* mtr, /*!< in: mtr */
ulint val, /*!< in: value to write */
ulint type) /*!< in: MLOG_1BYTE, MLOG_2BYTES, MLOG_4BYTES */
{
dyn_array_t* mlog;
byte* ptr;
if (mtr_get_log_mode(mtr) == MTR_LOG_NONE) {
return;
}
mlog = &(mtr->log);
#if MLOG_1BYTE != 1
# error "MLOG_1BYTE != 1"
#endif
#if MLOG_2BYTES != 2
# error "MLOG_2BYTES != 2"
#endif
#if MLOG_4BYTES != 4
# error "MLOG_4BYTES != 4"
#endif
#if MLOG_8BYTES != 8
# error "MLOG_8BYTES != 8"
#endif
ptr = (byte*) dyn_array_push(mlog, type);
if (type == MLOG_4BYTES) {
mach_write_to_4(ptr, val);
} else if (type == MLOG_2BYTES) {
mach_write_to_2(ptr, val);
} else {
ut_ad(type == MLOG_1BYTE);
mach_write_to_1(ptr, val);
}
}
/********************************************************//**
Catenates a compressed ulint to mlog. */
UNIV_INLINE
void
mlog_catenate_ulint_compressed(
/*===========================*/
mtr_t* mtr, /*!< in: mtr */
ulint val) /*!< in: value to write */
{
byte* log_ptr;
log_ptr = mlog_open(mtr, 10);
/* If no logging is requested, we may return now */
if (log_ptr == NULL) {
return;
}
log_ptr += mach_write_compressed(log_ptr, val);
mlog_close(mtr, log_ptr);
}
/********************************************************//**
Catenates a compressed dulint to mlog. */
UNIV_INLINE
void
mlog_catenate_dulint_compressed(
/*============================*/
mtr_t* mtr, /*!< in: mtr */
dulint val) /*!< in: value to write */
{
byte* log_ptr;
log_ptr = mlog_open(mtr, 15);
/* If no logging is requested, we may return now */
if (log_ptr == NULL) {
return;
}
log_ptr += mach_dulint_write_compressed(log_ptr, val);
mlog_close(mtr, log_ptr);
}
/********************************************************//**
Writes the initial part of a log record (3..11 bytes).
If the implementation of this function is changed, all
size parameters to mlog_open() should be adjusted accordingly!
@return new value of log_ptr */
UNIV_INLINE
byte*
mlog_write_initial_log_record_fast(
/*===============================*/
const byte* ptr, /*!< in: pointer to (inside) a buffer
frame holding the file page where
modification is made */
byte type, /*!< in: log item type: MLOG_1BYTE, ... */
byte* log_ptr,/*!< in: pointer to mtr log which has
been opened */
mtr_t* mtr) /*!< in: mtr */
{
#ifdef UNIV_DEBUG
buf_block_t* block;
#endif
const byte* page;
ulint space;
ulint offset;
ut_ad(mtr_memo_contains_page(mtr, ptr, MTR_MEMO_PAGE_X_FIX));
ut_ad(type <= MLOG_BIGGEST_TYPE);
ut_ad(ptr && log_ptr);
page = (const byte*) ut_align_down(ptr, UNIV_PAGE_SIZE);
space = mach_read_from_4(page + FIL_PAGE_ARCH_LOG_NO_OR_SPACE_ID);
offset = mach_read_from_4(page + FIL_PAGE_OFFSET);
/* check whether the page is in the doublewrite buffer;
the doublewrite buffer is located in pages
FSP_EXTENT_SIZE, ..., 3 * FSP_EXTENT_SIZE - 1 in the
system tablespace */
if (space == TRX_SYS_SPACE
&& offset >= FSP_EXTENT_SIZE && offset < 3 * FSP_EXTENT_SIZE) {
if (trx_doublewrite_buf_is_being_created) {
/* Do nothing: we only come to this branch in an
InnoDB database creation. We do not redo log
anything for the doublewrite buffer pages. */
return(log_ptr);
} else {
fprintf(stderr,
"Error: trying to redo log a record of type "
"%d on page %lu of space %lu in the "
"doublewrite buffer, continuing anyway.\n"
"Please post a bug report to "
"bugs.mysql.com.\n",
type, offset, space);
}
}
mach_write_to_1(log_ptr, type);
log_ptr++;
log_ptr += mach_write_compressed(log_ptr, space);
log_ptr += mach_write_compressed(log_ptr, offset);
mtr->n_log_recs++;
#ifdef UNIV_LOG_DEBUG
fprintf(stderr,
"Adding to mtr log record type %lu space %lu page no %lu\n",
(ulong) type, space, offset);
#endif
#ifdef UNIV_DEBUG
/* We now assume that all x-latched pages have been modified! */
block = (buf_block_t*) buf_block_align(ptr);
if (!mtr_memo_contains(mtr, block, MTR_MEMO_MODIFY)) {
mtr_memo_push(mtr, block, MTR_MEMO_MODIFY);
}
#endif
return(log_ptr);
}
/********************************************************//**
Writes a log record about an .ibd file create/delete/rename.
@return new value of log_ptr */
UNIV_INLINE
byte*
mlog_write_initial_log_record_for_file_op(
/*======================================*/
ulint type, /*!< in: MLOG_FILE_CREATE, MLOG_FILE_DELETE, or
MLOG_FILE_RENAME */
ulint space_id,/*!< in: space id, if applicable */
ulint page_no,/*!< in: page number (not relevant currently) */
byte* log_ptr,/*!< in: pointer to mtr log which has been opened */
mtr_t* mtr) /*!< in: mtr */
{
ut_ad(log_ptr);
mach_write_to_1(log_ptr, type);
log_ptr++;
/* We write dummy space id and page number */
log_ptr += mach_write_compressed(log_ptr, space_id);
log_ptr += mach_write_compressed(log_ptr, page_no);
mtr->n_log_recs++;
return(log_ptr);
}
#endif /* !UNIV_HOTBACKUP */
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