1/***************************************************************************** 2 3Copyright (c) 1996, 2013, Oracle and/or its affiliates. All Rights Reserved. 4Copyright (c) 2017, 2018, MariaDB Corporation. 5 6This program is free software; you can redistribute it and/or modify it under 7the terms of the GNU General Public License as published by the Free Software 8Foundation; version 2 of the License. 9 10This program is distributed in the hope that it will be useful, but WITHOUT 11ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 12FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 13 14You should have received a copy of the GNU General Public License along with 15this program; if not, write to the Free Software Foundation, Inc., 1651 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA 17 18*****************************************************************************/ 19 20/**************************************************//** 21@file include/trx0rseg.ic 22Rollback segment 23 24Created 3/26/1996 Heikki Tuuri 25*******************************************************/ 26 27#include "srv0srv.h" 28#include "mtr0log.h" 29 30/** Gets a rollback segment header. 31@param[in] space space where placed 32@param[in] page_no page number of the header 33@param[in,out] mtr mini-transaction 34@return rollback segment header, page x-latched */ 35UNIV_INLINE 36trx_rsegf_t* 37trx_rsegf_get(fil_space_t* space, ulint page_no, mtr_t* mtr) 38{ 39 ut_ad(space == fil_system.sys_space || space == fil_system.temp_space 40 || srv_is_undo_tablespace(space->id) 41 || !srv_was_started); 42 43 buf_block_t* block = buf_page_get(page_id_t(space->id, page_no), 44 univ_page_size, RW_X_LATCH, mtr); 45 46 buf_block_dbg_add_level(block, SYNC_RSEG_HEADER); 47 48 return TRX_RSEG + block->frame; 49} 50 51/** Gets a newly created rollback segment header. 52@param[in] space space where placed 53@param[in] page_no page number of the header 54@param[in,out] mtr mini-transaction 55@return rollback segment header, page x-latched */ 56UNIV_INLINE 57trx_rsegf_t* 58trx_rsegf_get_new( 59 ulint space, 60 ulint page_no, 61 mtr_t* mtr) 62{ 63 buf_block_t* block; 64 trx_rsegf_t* header; 65 66 ut_ad(space <= srv_undo_tablespaces_active || space == SRV_TMP_SPACE_ID 67 || !srv_was_started); 68 ut_ad(space <= TRX_SYS_MAX_UNDO_SPACES || space == SRV_TMP_SPACE_ID); 69 70 block = buf_page_get( 71 page_id_t(space, page_no), univ_page_size, RW_X_LATCH, mtr); 72 73 buf_block_dbg_add_level(block, SYNC_RSEG_HEADER_NEW); 74 75 header = TRX_RSEG + buf_block_get_frame(block); 76 77 return(header); 78} 79 80/***************************************************************//** 81Sets the file page number of the nth undo log slot. */ 82UNIV_INLINE 83void 84trx_rsegf_set_nth_undo( 85/*===================*/ 86 trx_rsegf_t* rsegf, /*!< in: rollback segment header */ 87 ulint n, /*!< in: index of slot */ 88 ulint page_no,/*!< in: page number of the undo log segment */ 89 mtr_t* mtr) /*!< in: mtr */ 90{ 91 ut_a(n < TRX_RSEG_N_SLOTS); 92 93 mlog_write_ulint(rsegf + TRX_RSEG_UNDO_SLOTS + n * TRX_RSEG_SLOT_SIZE, 94 page_no, MLOG_4BYTES, mtr); 95} 96 97/****************************************************************//** 98Looks for a free slot for an undo log segment. 99@return slot index or ULINT_UNDEFINED if not found */ 100UNIV_INLINE 101ulint 102trx_rsegf_undo_find_free(const trx_rsegf_t* rsegf) 103{ 104 ulint i; 105 ulint page_no; 106 ulint max_slots = TRX_RSEG_N_SLOTS; 107 108#ifdef UNIV_DEBUG 109 if (trx_rseg_n_slots_debug) { 110 max_slots = ut_min(static_cast<ulint>(trx_rseg_n_slots_debug), 111 static_cast<ulint>(TRX_RSEG_N_SLOTS)); 112 } 113#endif 114 115 for (i = 0; i < max_slots; i++) { 116 page_no = trx_rsegf_get_nth_undo(rsegf, i); 117 118 if (page_no == FIL_NULL) { 119 return(i); 120 } 121 } 122 123 return(ULINT_UNDEFINED); 124} 125