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Diffstat (limited to 'storage/xtradb/include/trx0rseg.ic')
| -rw-r--r-- | storage/xtradb/include/trx0rseg.ic | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/storage/xtradb/include/trx0rseg.ic b/storage/xtradb/include/trx0rseg.ic new file mode 100644 index 00000000000..e665a40fa8b --- /dev/null +++ b/storage/xtradb/include/trx0rseg.ic @@ -0,0 +1,146 @@ +/***************************************************************************** + +Copyright (c) 1996, 2009, Innobase Oy. All Rights Reserved. + +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., 59 Temple +Place, Suite 330, Boston, MA 02111-1307 USA + +*****************************************************************************/ + +/****************************************************** +Rollback segment + +Created 3/26/1996 Heikki Tuuri +*******************************************************/ + +#include "srv0srv.h" + +/********************************************************************** +Gets a rollback segment header. */ +UNIV_INLINE +trx_rsegf_t* +trx_rsegf_get( +/*==========*/ + /* out: rollback segment header, page + x-latched */ + ulint space, /* in: space where placed */ + ulint zip_size, /* in: compressed page size in bytes + or 0 for uncompressed pages */ + ulint page_no, /* in: page number of the header */ + mtr_t* mtr) /* in: mtr */ +{ + buf_block_t* block; + trx_rsegf_t* header; + + block = buf_page_get(space, zip_size, page_no, 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. */ +UNIV_INLINE +trx_rsegf_t* +trx_rsegf_get_new( +/*==============*/ + /* out: rollback segment header, page + x-latched */ + ulint space, /* in: space where placed */ + ulint zip_size, /* in: compressed page size in bytes + or 0 for uncompressed pages */ + ulint page_no, /* in: page number of the header */ + mtr_t* mtr) /* in: mtr */ +{ + buf_block_t* block; + trx_rsegf_t* header; + + block = buf_page_get(space, zip_size, page_no, 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. */ +UNIV_INLINE +ulint +trx_rsegf_get_nth_undo( +/*===================*/ + /* out: page number of the undo log segment */ + trx_rsegf_t* rsegf, /* in: rollback segment header */ + ulint n, /* in: index of slot */ + mtr_t* mtr) /* in: mtr */ +{ + if (UNIV_UNLIKELY(n >= TRX_RSEG_N_SLOTS)) { + fprintf(stderr, + "InnoDB: Error: trying to get slot %lu of rseg\n", + (ulong) n); + ut_error; + } + + 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 */ +{ + if (UNIV_UNLIKELY(n >= TRX_RSEG_N_SLOTS)) { + fprintf(stderr, + "InnoDB: Error: trying to set slot %lu of rseg\n", + (ulong) n); + ut_error; + } + + 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. */ +UNIV_INLINE +ulint +trx_rsegf_undo_find_free( +/*=====================*/ + /* out: slot index or ULINT_UNDEFINED if not + found */ + trx_rsegf_t* rsegf, /* in: rollback segment header */ + mtr_t* mtr) /* in: mtr */ +{ + ulint i; + ulint page_no; + + for (i = 0; i < TRX_RSEG_N_SLOTS; i++) { + + page_no = trx_rsegf_get_nth_undo(rsegf, i, mtr); + + if (page_no == FIL_NULL) { + + return(i); + } + } + + return(ULINT_UNDEFINED); +} |