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/*****************************************************************************
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);
}
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