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/******************************************************
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Created 3/26/1996 Heikki Tuuri
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*******************************************************/
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#include "trx0rseg.ic"
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#include "trx0purge.h"
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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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rseg = UT_LIST_GET_FIRST(trx_sys->rseg_list);
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while (rseg->id != id) {
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rseg = UT_LIST_GET_NEXT(rseg_list, rseg);
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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 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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trx_sysf_t* sys_header;
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ut_ad(mutex_own(&kernel_mutex));
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ut_ad(mtr_memo_contains(mtr, fil_space_get_latch(space),
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sys_header = trx_sysf_get(mtr);
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*slot_no = trx_sysf_rseg_find_free(mtr);
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if (*slot_no == ULINT_UNDEFINED) {
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/* Allocate a new file segment for the rollback segment */
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page = fseg_create(space, 0, TRX_RSEG + TRX_RSEG_FSEG_HEADER, mtr);
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#ifdef UNIV_SYNC_DEBUG
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buf_page_dbg_add_level(page, SYNC_RSEG_HEADER_NEW);
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#endif /* UNIV_SYNC_DEBUG */
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page_no = buf_frame_get_page_no(page);
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/* Get the rollback segment file page */
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rsegf = trx_rsegf_get_new(space, page_no, mtr);
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/* Initialize max size field */
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mlog_write_ulint(rsegf + TRX_RSEG_MAX_SIZE, max_size,
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/* Initialize the history list */
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mlog_write_ulint(rsegf + TRX_RSEG_HISTORY_SIZE, 0, MLOG_4BYTES, mtr);
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flst_init(rsegf + TRX_RSEG_HISTORY, mtr);
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/* Reset the undo log slots */
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for (i = 0; i < TRX_RSEG_N_SLOTS; i++) {
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trx_rsegf_set_nth_undo(rsegf, i, FIL_NULL, mtr);
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/* Add the rollback segment info to the free slot in the trx system
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trx_sysf_rseg_set_space(sys_header, *slot_no, space, mtr);
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trx_sysf_rseg_set_page_no(sys_header, *slot_no, page_no, mtr);
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/***************************************************************************
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Creates and initializes a rollback segment object. The values for the
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fields are read from the header. The object is inserted to the rseg
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list of the trx system object and a pointer is inserted in the rseg
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array in the trx system object. */
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/* out, own: rollback segment object */
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ulint id, /* in: rollback segment id */
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ulint space, /* in: space where the segment placed */
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ulint page_no, /* in: page number of the segment header */
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mtr_t* mtr) /* in: mtr */
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trx_rsegf_t* rseg_header;
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trx_ulogf_t* undo_log_hdr;
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fil_addr_t node_addr;
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ulint sum_of_undo_sizes;
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ut_ad(mutex_own(&kernel_mutex));
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rseg = mem_alloc(sizeof(trx_rseg_t));
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rseg->page_no = page_no;
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mutex_create(&rseg->mutex, SYNC_RSEG);
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UT_LIST_ADD_LAST(rseg_list, trx_sys->rseg_list, rseg);
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trx_sys_set_nth_rseg(trx_sys, id, rseg);
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rseg_header = trx_rsegf_get_new(space, page_no, mtr);
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rseg->max_size = mtr_read_ulint(rseg_header + TRX_RSEG_MAX_SIZE,
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/* Initialize the undo log lists according to the rseg header */
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sum_of_undo_sizes = trx_undo_lists_init(rseg);
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rseg->curr_size = mtr_read_ulint(rseg_header + TRX_RSEG_HISTORY_SIZE,
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+ 1 + sum_of_undo_sizes;
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len = flst_get_len(rseg_header + TRX_RSEG_HISTORY, mtr);
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trx_sys->rseg_history_len += len;
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node_addr = trx_purge_get_log_from_hist(
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flst_get_last(rseg_header + TRX_RSEG_HISTORY, mtr));
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rseg->last_page_no = node_addr.page;
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rseg->last_offset = node_addr.boffset;
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undo_log_hdr = trx_undo_page_get(rseg->space, node_addr.page,
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mtr) + node_addr.boffset;
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rseg->last_trx_no = mtr_read_dulint(
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undo_log_hdr + TRX_UNDO_TRX_NO, mtr);
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rseg->last_del_marks = mtr_read_ulint(
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undo_log_hdr + TRX_UNDO_DEL_MARKS, MLOG_2BYTES, mtr);
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rseg->last_page_no = FIL_NULL;
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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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UT_LIST_INIT(trx_sys->rseg_list);
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trx_sys->rseg_history_len = 0;
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for (i = 0; i < TRX_SYS_N_RSEGS; i++) {
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page_no = trx_sysf_rseg_get_page_no(sys_header, i, mtr);
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if (page_no == FIL_NULL) {
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trx_sys_set_nth_rseg(trx_sys, i, NULL);
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space = trx_sysf_rseg_get_space(sys_header, i, mtr);
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trx_rseg_mem_create(i, space, page_no, 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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mtr_x_lock(fil_space_get_latch(space), mtr);
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mutex_enter(&kernel_mutex);
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page_no = trx_rseg_header_create(space, max_size, id, mtr);
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if (page_no == FIL_NULL) {
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mutex_exit(&kernel_mutex);
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rseg = trx_rseg_mem_create(*id, space, page_no, mtr);
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mutex_exit(&kernel_mutex);