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/******************************************************
Rollback segment
(c) 1996 Innobase Oy
Created 3/26/1996 Heikki Tuuri
*******************************************************/
#include "srv0srv.h"
#include "mtr0log.h"
#include "trx0sys.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 page_no, /* in: page number of the header */
mtr_t* mtr) /* in: mtr */
{
trx_rsegf_t* header;
header = TRX_RSEG + buf_page_get(space, page_no, RW_X_LATCH, mtr);
#ifdef UNIV_SYNC_DEBUG
buf_page_dbg_add_level(header, SYNC_RSEG_HEADER);
#endif /* UNIV_SYNC_DEBUG */
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 page_no, /* in: page number of the header */
mtr_t* mtr) /* in: mtr */
{
trx_rsegf_t* header;
header = TRX_RSEG + buf_page_get(space, page_no, RW_X_LATCH, mtr);
#ifdef UNIV_SYNC_DEBUG
buf_page_dbg_add_level(header, SYNC_RSEG_HEADER_NEW);
#endif /* UNIV_SYNC_DEBUG */
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;
#ifndef UNIV_DEBUG
i < TRX_RSEG_N_SLOTS;
#else
i < (trx_rseg_n_slots_debug ? trx_rseg_n_slots_debug : TRX_RSEG_N_SLOTS);
#endif
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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