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/******************************************************
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Created 3/26/1996 Heikki Tuuri
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*******************************************************/
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#include "trx0types.h"
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/**********************************************************************
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Gets a rollback segment header. */
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/* out: rollback segment header, page
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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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/* out: rollback segment header, page
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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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trx_rsegf_get_nth_undo(
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/*===================*/
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/* out: page number of the undo log segment */
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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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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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trx_rsegf_undo_find_free(
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/*=====================*/
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/* out: slot index or ULINT_UNDEFINED if not
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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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/* out: rollback segment */
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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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trx_rseg_header_create(
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/*===================*/
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/* out: page number of the created segment,
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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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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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/* out: the created segment object, NULL if
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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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/* Number of undo log slots in a rollback segment file copy */
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#define TRX_RSEG_N_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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ulint space; /* space where the rollback segment is
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ulint zip_size;/* in: 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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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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dulint last_trx_no; /* Transaction number of the last not
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ibool last_del_marks; /* TRUE if the last not yet purged log
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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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/* 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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#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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#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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#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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#include "trx0rseg.ic"
added
removed
storage/innobase/include/trx0rseg.h
