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111 lines
3.9 KiB
C
111 lines
3.9 KiB
C
/*****************************************************************************
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Copyright (c) 2011-2012, Percona Inc. All Rights Reserved.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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Place, Suite 330, Boston, MA 02111-1307 USA
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*****************************************************************************/
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/**************************************************//**
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@file include/log0online.h
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Online database log parsing for changed page tracking
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*******************************************************/
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#ifndef log0online_h
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#define log0online_h
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#include "univ.i"
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#include "os0file.h"
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/*********************************************************************//**
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Initializes the online log following subsytem. */
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UNIV_INTERN
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void
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log_online_read_init();
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/*===================*/
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/*********************************************************************//**
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Shuts down the online log following subsystem. */
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UNIV_INTERN
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void
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log_online_read_shutdown();
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/*=======================*/
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/*********************************************************************//**
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Reads and parses the redo log up to last checkpoint LSN to build the changed
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page bitmap which is then written to disk. */
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UNIV_INTERN
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void
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log_online_follow_redo_log();
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/*=========================*/
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/** The iterator through all bits of changed pages bitmap blocks */
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struct log_bitmap_iterator_struct
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{
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char in_name[FN_REFLEN]; /*!< the file name for bitmap
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input */
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os_file_t in; /*!< the bitmap input file */
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ib_uint64_t in_offset; /*!< the next write position in the
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bitmap output file */
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ib_uint32_t bit_offset; /*!< bit offset inside of bitmap
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block*/
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ib_uint64_t start_lsn; /*!< Start lsn of the block */
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ib_uint64_t end_lsn; /*!< End lsn of the block */
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ib_uint32_t space_id; /*!< Block space id */
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ib_uint32_t first_page_id; /*!< First block page id */
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ibool changed; /*!< true if current page was changed */
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byte* page; /*!< Bitmap block */
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};
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typedef struct log_bitmap_iterator_struct log_bitmap_iterator_t;
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#define LOG_BITMAP_ITERATOR_START_LSN(i) \
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((i).start_lsn)
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#define LOG_BITMAP_ITERATOR_END_LSN(i) \
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((i).end_lsn)
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#define LOG_BITMAP_ITERATOR_SPACE_ID(i) \
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((i).space_id)
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#define LOG_BITMAP_ITERATOR_PAGE_NUM(i) \
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((i).first_page_id + (i).bit_offset)
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#define LOG_BITMAP_ITERATOR_PAGE_CHANGED(i) \
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((i).changed)
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/*********************************************************************//**
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Initializes log bitmap iterator.
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@return TRUE if the iterator is initialized OK, FALSE otherwise. */
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UNIV_INTERN
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ibool
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log_online_bitmap_iterator_init(
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/*============================*/
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log_bitmap_iterator_t *i); /*!<in/out: iterator */
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/*********************************************************************//**
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Releases log bitmap iterator. */
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UNIV_INTERN
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void
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log_online_bitmap_iterator_release(
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/*===============================*/
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log_bitmap_iterator_t *i); /*!<in/out: iterator */
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/*********************************************************************//**
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Iterates through bits of saved bitmap blocks.
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Sequentially reads blocks from bitmap file(s) and interates through
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their bits. Ignores blocks with wrong checksum.
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@return TRUE if iteration is successful, FALSE if all bits are iterated. */
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UNIV_INTERN
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ibool
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log_online_bitmap_iterator_next(
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/*============================*/
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log_bitmap_iterator_t *i); /*!<in/out: iterator */
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#endif
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