1/***************************************************************************** 2 3Copyright (c) 1996, 2009, Oracle and/or its affiliates. All Rights Reserved. 4 5This program is free software; you can redistribute it and/or modify 6it under the terms of the GNU General Public License, version 2.0, 7as published by the Free Software Foundation. 8 9This program is also distributed with certain software (including 10but not limited to OpenSSL) that is licensed under separate terms, 11as designated in a particular file or component or in included license 12documentation. The authors of MySQL hereby grant you an additional 13permission to link the program and your derivative works with the 14separately licensed software that they have included with MySQL. 15 16This program is distributed in the hope that it will be useful, 17but WITHOUT ANY WARRANTY; without even the implied warranty of 18MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19GNU General Public License, version 2.0, for more details. 20 21You should have received a copy of the GNU General Public License along with 22this program; if not, write to the Free Software Foundation, Inc., 2351 Franklin Street, Suite 500, Boston, MA 02110-1335 USA 24 25*****************************************************************************/ 26 27/**************************************************//** 28@file include/trx0rseg.ic 29Rollback segment 30 31Created 3/26/1996 Heikki Tuuri 32*******************************************************/ 33 34#include "srv0srv.h" 35#include "mtr0log.h" 36#include "trx0sys.h" 37 38/******************************************************************//** 39Gets a rollback segment header. 40@return rollback segment header, page x-latched */ 41UNIV_INLINE 42trx_rsegf_t* 43trx_rsegf_get( 44/*==========*/ 45 ulint space, /*!< in: space where placed */ 46 ulint zip_size, /*!< in: compressed page size in bytes 47 or 0 for uncompressed pages */ 48 ulint page_no, /*!< in: page number of the header */ 49 mtr_t* mtr) /*!< in: mtr */ 50{ 51 buf_block_t* block; 52 trx_rsegf_t* header; 53 54 block = buf_page_get(space, zip_size, page_no, RW_X_LATCH, mtr); 55 buf_block_dbg_add_level(block, SYNC_RSEG_HEADER); 56 57 header = TRX_RSEG + buf_block_get_frame(block); 58 59 return(header); 60} 61 62/******************************************************************//** 63Gets a newly created rollback segment header. 64@return rollback segment header, page x-latched */ 65UNIV_INLINE 66trx_rsegf_t* 67trx_rsegf_get_new( 68/*==============*/ 69 ulint space, /*!< in: space where placed */ 70 ulint zip_size, /*!< in: compressed page size in bytes 71 or 0 for uncompressed pages */ 72 ulint page_no, /*!< in: page number of the header */ 73 mtr_t* mtr) /*!< in: mtr */ 74{ 75 buf_block_t* block; 76 trx_rsegf_t* header; 77 78 block = buf_page_get(space, zip_size, page_no, RW_X_LATCH, mtr); 79 buf_block_dbg_add_level(block, SYNC_RSEG_HEADER_NEW); 80 81 header = TRX_RSEG + buf_block_get_frame(block); 82 83 return(header); 84} 85 86/***************************************************************//** 87Gets the file page number of the nth undo log slot. 88@return page number of the undo log segment */ 89UNIV_INLINE 90ulint 91trx_rsegf_get_nth_undo( 92/*===================*/ 93 trx_rsegf_t* rsegf, /*!< in: rollback segment header */ 94 ulint n, /*!< in: index of slot */ 95 mtr_t* mtr) /*!< in: mtr */ 96{ 97 if (n >= TRX_RSEG_N_SLOTS) { 98 fprintf(stderr, 99 "InnoDB: Error: trying to get slot %lu of rseg\n", 100 (ulong) n); 101 ut_error; 102 } 103 104 return(mtr_read_ulint(rsegf + TRX_RSEG_UNDO_SLOTS 105 + n * TRX_RSEG_SLOT_SIZE, MLOG_4BYTES, mtr)); 106} 107 108/***************************************************************//** 109Sets the file page number of the nth undo log slot. */ 110UNIV_INLINE 111void 112trx_rsegf_set_nth_undo( 113/*===================*/ 114 trx_rsegf_t* rsegf, /*!< in: rollback segment header */ 115 ulint n, /*!< in: index of slot */ 116 ulint page_no,/*!< in: page number of the undo log segment */ 117 mtr_t* mtr) /*!< in: mtr */ 118{ 119 if (n >= TRX_RSEG_N_SLOTS) { 120 fprintf(stderr, 121 "InnoDB: Error: trying to set slot %lu of rseg\n", 122 (ulong) n); 123 ut_error; 124 } 125 126 mlog_write_ulint(rsegf + TRX_RSEG_UNDO_SLOTS + n * TRX_RSEG_SLOT_SIZE, 127 page_no, MLOG_4BYTES, mtr); 128} 129 130/****************************************************************//** 131Looks for a free slot for an undo log segment. 132@return slot index or ULINT_UNDEFINED if not found */ 133UNIV_INLINE 134ulint 135trx_rsegf_undo_find_free( 136/*=====================*/ 137 trx_rsegf_t* rsegf, /*!< in: rollback segment header */ 138 mtr_t* mtr) /*!< in: mtr */ 139{ 140 ulint i; 141 ulint page_no; 142 143 for (i = 0; 144#ifndef UNIV_DEBUG 145 i < TRX_RSEG_N_SLOTS; 146#else 147 i < (trx_rseg_n_slots_debug ? trx_rseg_n_slots_debug : TRX_RSEG_N_SLOTS); 148#endif 149 i++) { 150 151 page_no = trx_rsegf_get_nth_undo(rsegf, i, mtr); 152 153 if (page_no == FIL_NULL) { 154 155 return(i); 156 } 157 } 158 159 return(ULINT_UNDEFINED); 160} 161 162/******************************************************************//** 163Looks for a rollback segment, based on the rollback segment id. 164@return rollback segment */ 165UNIV_INLINE 166trx_rseg_t* 167trx_rseg_get_on_id( 168/*===============*/ 169 ulint id) /*!< in: rollback segment id */ 170{ 171 ut_a(id < TRX_SYS_N_RSEGS); 172 173 return(trx_sys->rseg_array[id]); 174} 175 176