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/*****************************************************************************
Copyright (c) 1996, 2013, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2017, MariaDB Corporation.
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
*****************************************************************************/
/**************************************************//**
@file include/trx0rseg.ic
Rollback segment
Created 3/26/1996 Heikki Tuuri
*******************************************************/
#include "srv0srv.h"
#include "mtr0log.h"
/** Gets a rollback segment header.
@param[in] space space where placed
@param[in] page_no page number of the header
@param[in,out] mtr mini-transaction
@return rollback segment header, page x-latched */
UNIV_INLINE
trx_rsegf_t*
trx_rsegf_get(
ulint space,
ulint page_no,
mtr_t* mtr)
{
buf_block_t* block;
trx_rsegf_t* header;
ut_ad(space <= srv_undo_space_id_start + srv_undo_tablespaces_active
|| space == SRV_TMP_SPACE_ID
|| !srv_was_started);
ut_ad(space <= srv_undo_space_id_start + TRX_SYS_MAX_UNDO_SPACES
|| space == SRV_TMP_SPACE_ID);
block = buf_page_get(
page_id_t(space, page_no), univ_page_size, RW_X_LATCH, mtr);
buf_block_dbg_add_level(block, SYNC_RSEG_HEADER);
header = TRX_RSEG + buf_block_get_frame(block);
return(header);
}
/** Gets a newly created rollback segment header.
@param[in] space space where placed
@param[in] page_no page number of the header
@param[in,out] mtr mini-transaction
@return rollback segment header, page x-latched */
UNIV_INLINE
trx_rsegf_t*
trx_rsegf_get_new(
ulint space,
ulint page_no,
mtr_t* mtr)
{
buf_block_t* block;
trx_rsegf_t* header;
ut_ad(space <= srv_undo_tablespaces_active || space == SRV_TMP_SPACE_ID
|| !srv_was_started);
ut_ad(space <= TRX_SYS_MAX_UNDO_SPACES || space == SRV_TMP_SPACE_ID);
block = buf_page_get(
page_id_t(space, page_no), univ_page_size, RW_X_LATCH, mtr);
buf_block_dbg_add_level(block, SYNC_RSEG_HEADER_NEW);
header = TRX_RSEG + buf_block_get_frame(block);
return(header);
}
/***************************************************************//**
Gets the file page number of the nth undo log slot.
@return page number of the undo log segment */
UNIV_INLINE
ulint
trx_rsegf_get_nth_undo(
/*===================*/
trx_rsegf_t* rsegf, /*!< in: rollback segment header */
ulint n, /*!< in: index of slot */
mtr_t* mtr) /*!< in: mtr */
{
ut_a(n < TRX_RSEG_N_SLOTS);
return(mtr_read_ulint(rsegf + TRX_RSEG_UNDO_SLOTS
+ n * TRX_RSEG_SLOT_SIZE, MLOG_4BYTES, 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 */
{
ut_a(n < TRX_RSEG_N_SLOTS);
mlog_write_ulint(rsegf + TRX_RSEG_UNDO_SLOTS + n * TRX_RSEG_SLOT_SIZE,
page_no, MLOG_4BYTES, mtr);
}
/****************************************************************//**
Looks for a free slot for an undo log segment.
@return slot index or ULINT_UNDEFINED if not found */
UNIV_INLINE
ulint
trx_rsegf_undo_find_free(
/*=====================*/
trx_rsegf_t* rsegf, /*!< in: rollback segment header */
mtr_t* mtr) /*!< in: mtr */
{
ulint i;
ulint page_no;
ulint max_slots = TRX_RSEG_N_SLOTS;
#ifdef UNIV_DEBUG
if (trx_rseg_n_slots_debug) {
max_slots = ut_min(static_cast<ulint>(trx_rseg_n_slots_debug),
static_cast<ulint>(TRX_RSEG_N_SLOTS));
}
#endif
for (i = 0; i < max_slots; i++) {
page_no = trx_rsegf_get_nth_undo(rsegf, i, mtr);
if (page_no == FIL_NULL) {
return(i);
}
}
return(ULINT_UNDEFINED);
}
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