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/*****************************************************************************
Copyright (c) 2011-2012, Percona Inc. 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/log0online.h
Online database log parsing for changed page tracking
*******************************************************/
#ifndef log0online_h
#define log0online_h
#include "univ.i"
#include "os0file.h"
/*********************************************************************//**
Initializes the online log following subsytem. */
UNIV_INTERN
void
log_online_read_init();
/*===================*/
/*********************************************************************//**
Shuts down the online log following subsystem. */
UNIV_INTERN
void
log_online_read_shutdown();
/*=======================*/
/*********************************************************************//**
Reads and parses the redo log up to last checkpoint LSN to build the changed
page bitmap which is then written to disk. */
UNIV_INTERN
void
log_online_follow_redo_log();
/*=========================*/
/** The iterator through all bits of changed pages bitmap blocks */
struct log_bitmap_iterator_struct
{
char in_name[FN_REFLEN]; /*!< the file name for bitmap
input */
os_file_t in; /*!< the bitmap input file */
ib_uint64_t in_offset; /*!< the next write position in the
bitmap output file */
ib_uint32_t bit_offset; /*!< bit offset inside of bitmap
block*/
ib_uint64_t start_lsn; /*!< Start lsn of the block */
ib_uint64_t end_lsn; /*!< End lsn of the block */
ib_uint32_t space_id; /*!< Block space id */
ib_uint32_t first_page_id; /*!< First block page id */
ibool changed; /*!< true if current page was changed */
byte* page; /*!< Bitmap block */
};
typedef struct log_bitmap_iterator_struct log_bitmap_iterator_t;
#define LOG_BITMAP_ITERATOR_START_LSN(i) \
((i).start_lsn)
#define LOG_BITMAP_ITERATOR_END_LSN(i) \
((i).end_lsn)
#define LOG_BITMAP_ITERATOR_SPACE_ID(i) \
((i).space_id)
#define LOG_BITMAP_ITERATOR_PAGE_NUM(i) \
((i).first_page_id + (i).bit_offset)
#define LOG_BITMAP_ITERATOR_PAGE_CHANGED(i) \
((i).changed)
/*********************************************************************//**
Initializes log bitmap iterator.
@return TRUE if the iterator is initialized OK, FALSE otherwise. */
UNIV_INTERN
ibool
log_online_bitmap_iterator_init(
/*============================*/
log_bitmap_iterator_t *i); /*!<in/out: iterator */
/*********************************************************************//**
Releases log bitmap iterator. */
UNIV_INTERN
void
log_online_bitmap_iterator_release(
/*===============================*/
log_bitmap_iterator_t *i); /*!<in/out: iterator */
/*********************************************************************//**
Iterates through bits of saved bitmap blocks.
Sequentially reads blocks from bitmap file(s) and interates through
their bits. Ignores blocks with wrong checksum.
@return TRUE if iteration is successful, FALSE if all bits are iterated. */
UNIV_INTERN
ibool
log_online_bitmap_iterator_next(
/*============================*/
log_bitmap_iterator_t *i); /*!<in/out: iterator */
#endif
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