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216 lines
8.2 KiB
C
216 lines
8.2 KiB
C
/*****************************************************************************
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Copyright (c) 1996, 2009, Innobase Oy. 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/trx0rseg.h
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Rollback segment
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Created 3/26/1996 Heikki Tuuri
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*******************************************************/
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#ifndef trx0rseg_h
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#define trx0rseg_h
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#include "univ.i"
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#include "trx0types.h"
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#include "trx0sys.h"
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/******************************************************************//**
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Gets a rollback segment header.
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@return rollback segment header, page x-latched */
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UNIV_INLINE
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trx_rsegf_t*
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trx_rsegf_get(
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/*==========*/
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ulint space, /*!< in: space where placed */
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ulint zip_size, /*!< in: compressed page size in bytes
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or 0 for uncompressed pages */
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ulint page_no, /*!< in: page number of the header */
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mtr_t* mtr); /*!< in: mtr */
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/******************************************************************//**
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Gets a newly created rollback segment header.
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@return rollback segment header, page x-latched */
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UNIV_INLINE
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trx_rsegf_t*
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trx_rsegf_get_new(
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/*==============*/
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ulint space, /*!< in: space where placed */
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ulint zip_size, /*!< in: compressed page size in bytes
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or 0 for uncompressed pages */
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ulint page_no, /*!< in: page number of the header */
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mtr_t* mtr); /*!< in: mtr */
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/***************************************************************//**
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Gets the file page number of the nth undo log slot.
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@return page number of the undo log segment */
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UNIV_INLINE
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ulint
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trx_rsegf_get_nth_undo(
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/*===================*/
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trx_rsegf_t* rsegf, /*!< in: rollback segment header */
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ulint n, /*!< in: index of slot */
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mtr_t* mtr); /*!< in: mtr */
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/***************************************************************//**
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Sets the file page number of the nth undo log slot. */
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UNIV_INLINE
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void
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trx_rsegf_set_nth_undo(
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/*===================*/
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trx_rsegf_t* rsegf, /*!< in: rollback segment header */
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ulint n, /*!< in: index of slot */
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ulint page_no,/*!< in: page number of the undo log segment */
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mtr_t* mtr); /*!< in: mtr */
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/****************************************************************//**
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Looks for a free slot for an undo log segment.
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@return slot index or ULINT_UNDEFINED if not found */
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UNIV_INLINE
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ulint
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trx_rsegf_undo_find_free(
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/*=====================*/
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trx_rsegf_t* rsegf, /*!< in: rollback segment header */
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mtr_t* mtr); /*!< in: mtr */
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/******************************************************************//**
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Looks for a rollback segment, based on the rollback segment id.
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@return rollback segment */
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UNIV_INTERN
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trx_rseg_t*
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trx_rseg_get_on_id(
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/*===============*/
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ulint id); /*!< in: rollback segment id */
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/****************************************************************//**
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Creates a rollback segment header. This function is called only when
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a new rollback segment is created in the database.
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@return page number of the created segment, FIL_NULL if fail */
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UNIV_INTERN
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ulint
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trx_rseg_header_create(
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/*===================*/
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ulint space, /*!< in: space id */
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ulint zip_size, /*!< in: compressed page size in bytes
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or 0 for uncompressed pages */
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ulint max_size, /*!< in: max size in pages */
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ulint* slot_no, /*!< out: rseg id == slot number in trx sys */
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mtr_t* mtr); /*!< in: mtr */
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/*********************************************************************//**
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Creates the memory copies for rollback segments and initializes the
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rseg list and array in trx_sys at a database startup. */
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UNIV_INTERN
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void
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trx_rseg_list_and_array_init(
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/*=========================*/
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trx_sysf_t* sys_header, /*!< in: trx system header */
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mtr_t* mtr); /*!< in: mtr */
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/****************************************************************//**
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Creates a new rollback segment to the database.
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@return the created segment object, NULL if fail */
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UNIV_INTERN
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trx_rseg_t*
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trx_rseg_create(
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/*============*/
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ulint space, /*!< in: space id */
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ulint max_size, /*!< in: max size in pages */
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ulint* id, /*!< out: rseg id */
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mtr_t* mtr); /*!< in: mtr */
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/* Real max value may be 4076 in usual. But reserve 4 slot for safety or etc... */
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#define TRX_RSEG_N_EXTRA_SLOTS (((UNIV_PAGE_SIZE - (FIL_PAGE_DATA + FIL_PAGE_DATA_END + TRX_RSEG_UNDO_SLOTS)) / TRX_RSEG_SLOT_SIZE) - 4)
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/* Number of undo log slots in a rollback segment file copy */
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#define TRX_RSEG_N_SLOTS (srv_extra_undoslots ? TRX_RSEG_N_EXTRA_SLOTS : (UNIV_PAGE_SIZE / 16))
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/* Maximum number of transactions supported by a single rollback segment */
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#define TRX_RSEG_MAX_N_TRXS (TRX_RSEG_N_SLOTS / 2)
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/* The rollback segment memory object */
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struct trx_rseg_struct{
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/*--------------------------------------------------------*/
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ulint id; /*!< rollback segment id == the index of
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its slot in the trx system file copy */
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mutex_t mutex; /*!< mutex protecting the fields in this
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struct except id; NOTE that the latching
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order must always be kernel mutex ->
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rseg mutex */
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ulint space; /*!< space where the rollback segment is
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header is placed */
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ulint zip_size;/* compressed page size of space
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in bytes, or 0 for uncompressed spaces */
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ulint page_no;/* page number of the rollback segment
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header */
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ulint max_size;/* maximum allowed size in pages */
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ulint curr_size;/* current size in pages */
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/*--------------------------------------------------------*/
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/* Fields for update undo logs */
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UT_LIST_BASE_NODE_T(trx_undo_t) update_undo_list;
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/* List of update undo logs */
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UT_LIST_BASE_NODE_T(trx_undo_t) update_undo_cached;
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/* List of update undo log segments
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cached for fast reuse */
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/*--------------------------------------------------------*/
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/* Fields for insert undo logs */
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UT_LIST_BASE_NODE_T(trx_undo_t) insert_undo_list;
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/* List of insert undo logs */
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UT_LIST_BASE_NODE_T(trx_undo_t) insert_undo_cached;
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/* List of insert undo log segments
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cached for fast reuse */
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/*--------------------------------------------------------*/
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ulint last_page_no; /*!< Page number of the last not yet
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purged log header in the history list;
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FIL_NULL if all list purged */
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ulint last_offset; /*!< Byte offset of the last not yet
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purged log header */
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trx_id_t last_trx_no; /*!< Transaction number of the last not
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yet purged log */
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ibool last_del_marks; /*!< TRUE if the last not yet purged log
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needs purging */
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/*--------------------------------------------------------*/
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UT_LIST_NODE_T(trx_rseg_t) rseg_list;
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/* the list of the rollback segment
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memory objects */
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};
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/* Undo log segment slot in a rollback segment header */
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/*-------------------------------------------------------------*/
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#define TRX_RSEG_SLOT_PAGE_NO 0 /* Page number of the header page of
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an undo log segment */
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/*-------------------------------------------------------------*/
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/* Slot size */
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#define TRX_RSEG_SLOT_SIZE 4
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/* The offset of the rollback segment header on its page */
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#define TRX_RSEG FSEG_PAGE_DATA
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/* Transaction rollback segment header */
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/*-------------------------------------------------------------*/
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#define TRX_RSEG_MAX_SIZE 0 /* Maximum allowed size for rollback
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segment in pages */
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#define TRX_RSEG_HISTORY_SIZE 4 /* Number of file pages occupied
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by the logs in the history list */
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#define TRX_RSEG_HISTORY 8 /* The update undo logs for committed
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transactions */
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#define TRX_RSEG_FSEG_HEADER (8 + FLST_BASE_NODE_SIZE)
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/* Header for the file segment where
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this page is placed */
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#define TRX_RSEG_UNDO_SLOTS (8 + FLST_BASE_NODE_SIZE + FSEG_HEADER_SIZE)
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/* Undo log segment slots */
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/*-------------------------------------------------------------*/
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#ifndef UNIV_NONINL
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#include "trx0rseg.ic"
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#endif
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#endif
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