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/******************************************************
Rollback segment
(c) 1996 Innobase Oy
Created 3/26/1996 Heikki Tuuri
*******************************************************/
#ifndef trx0rseg_h
#define trx0rseg_h
#include "univ.i"
#include "trx0types.h"
#include "trx0sys.h"
/**********************************************************************
Gets a rollback segment header. */
UNIV_INLINE
trx_rsegf_t*
trx_rsegf_get(
/*==========*/
/* out: rollback segment header, page
x-latched */
ulint space, /* in: space where placed */
ulint page_no, /* in: page number of the header */
mtr_t* mtr); /* in: mtr */
/**********************************************************************
Gets a newly created rollback segment header. */
UNIV_INLINE
trx_rsegf_t*
trx_rsegf_get_new(
/*==============*/
/* out: rollback segment header, page
x-latched */
ulint space, /* in: space where placed */
ulint page_no, /* in: page number of the header */
mtr_t* mtr); /* in: mtr */
/*******************************************************************
Gets the file page number of the nth undo log slot. */
UNIV_INLINE
ulint
trx_rsegf_get_nth_undo(
/*===================*/
/* out: page number of the undo log segment */
trx_rsegf_t* rsegf, /* in: rollback segment header */
ulint n, /* in: index of slot */
mtr_t* mtr); /* in: mtr */
/*******************************************************************
Sets the file page number of the nth undo log slot. */
UNIV_INLINE
void
trx_rsegf_set_nth_undo(
/*===================*/
trx_rsegf_t* rsegf, /* in: rollback segment header */
ulint n, /* in: index of slot */
ulint page_no,/* in: page number of the undo log segment */
mtr_t* mtr); /* in: mtr */
/********************************************************************
Looks for a free slot for an undo log segment. */
UNIV_INLINE
ulint
trx_rsegf_undo_find_free(
/*=====================*/
/* out: slot index or ULINT_UNDEFINED if not
found */
trx_rsegf_t* rsegf, /* in: rollback segment header */
mtr_t* mtr); /* in: mtr */
/**********************************************************************
Looks for a rollback segment, based on the rollback segment id. */
trx_rseg_t*
trx_rseg_get_on_id(
/*===============*/
/* out: rollback segment */
ulint id); /* in: rollback segment id */
/********************************************************************
Creates a rollback segment header. This function is called only when
a new rollback segment is created in the database. */
ulint
trx_rseg_header_create(
/*===================*/
/* out: page number of the created segment,
FIL_NULL if fail */
ulint space, /* in: space id */
ulint max_size, /* in: max size in pages */
ulint* slot_no, /* out: rseg id == slot number in trx sys */
mtr_t* mtr); /* in: mtr */
/*************************************************************************
Creates the memory copies for rollback segments and initializes the
rseg list and array in trx_sys at a database startup. */
void
trx_rseg_list_and_array_init(
/*=========================*/
trx_sysf_t* sys_header, /* in: trx system header */
mtr_t* mtr); /* in: mtr */
/********************************************************************
Creates a new rollback segment to the database. */
trx_rseg_t*
trx_rseg_create(
/*============*/
/* out: the created segment object, NULL if
fail */
ulint space, /* in: space id */
ulint max_size, /* in: max size in pages */
ulint* id, /* out: rseg id */
mtr_t* mtr); /* in: mtr */
/* Number of undo log slots in a rollback segment file copy */
#define TRX_RSEG_N_SLOTS 1024
/* Maximum number of transactions supported by a single rollback segment */
#define TRX_RSEG_MAX_N_TRXS (TRX_RSEG_N_SLOTS / 2)
/* The rollback segment memory object */
struct trx_rseg_struct{
/*--------------------------------------------------------*/
ulint id; /* rollback segment id == the index of
its slot in the trx system file copy */
mutex_t mutex; /* mutex protecting the fields in this
struct except id; NOTE that the latching
order must always be kernel mutex ->
rseg mutex */
ulint space; /* space where the rollback segment is
header is placed */
ulint page_no;/* page number of the rollback segment
header */
ulint max_size;/* maximum allowed size in pages */
ulint curr_size;/* current size in pages */
/*--------------------------------------------------------*/
/* Fields for update undo logs */
UT_LIST_BASE_NODE_T(trx_undo_t) update_undo_list;
/* List of update undo logs */
UT_LIST_BASE_NODE_T(trx_undo_t) update_undo_cached;
/* List of update undo log segments
cached for fast reuse */
/*--------------------------------------------------------*/
/* Fields for insert undo logs */
UT_LIST_BASE_NODE_T(trx_undo_t) insert_undo_list;
/* List of insert undo logs */
UT_LIST_BASE_NODE_T(trx_undo_t) insert_undo_cached;
/* List of insert undo log segments
cached for fast reuse */
/*--------------------------------------------------------*/
ulint last_page_no; /* Page number of the last not yet
purged log header in the history list;
FIL_NULL if all list purged */
ulint last_offset; /* Byte offset of the last not yet
purged log header */
dulint last_trx_no; /* Transaction number of the last not
yet purged log */
ibool last_del_marks; /* TRUE if the last not yet purged log
needs purging */
/*--------------------------------------------------------*/
UT_LIST_NODE_T(trx_rseg_t) rseg_list;
/* the list of the rollback segment
memory objects */
};
/* Undo log segment slot in a rollback segment header */
/*-------------------------------------------------------------*/
#define TRX_RSEG_SLOT_PAGE_NO 0 /* Page number of the header page of
an undo log segment */
/*-------------------------------------------------------------*/
/* Slot size */
#define TRX_RSEG_SLOT_SIZE 4
/* The offset of the rollback segment header on its page */
#define TRX_RSEG FSEG_PAGE_DATA
/* Transaction rollback segment header */
/*-------------------------------------------------------------*/
#define TRX_RSEG_MAX_SIZE 0 /* Maximum allowed size for rollback
segment in pages */
#define TRX_RSEG_HISTORY_SIZE 4 /* Number of file pages occupied
by the logs in the history list */
#define TRX_RSEG_HISTORY 8 /* The update undo logs for committed
transactions */
#define TRX_RSEG_FSEG_HEADER (8 + FLST_BASE_NODE_SIZE)
/* Header for the file segment where
this page is placed */
#define TRX_RSEG_UNDO_SLOTS (8 + FLST_BASE_NODE_SIZE + FSEG_HEADER_SIZE)
/* Undo log segment slots */
/*-------------------------------------------------------------*/
#ifndef UNIV_NONINL
#include "trx0rseg.ic"
#endif
#endif
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