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/*****************************************************************************
Copyright (c) 1996, 2012, Oracle and/or its affiliates. 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.,
51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA
*****************************************************************************/
/**************************************************//**
@file include/trx0rec.ic
Transaction undo log record
Created 3/26/1996 Heikki Tuuri
*******************************************************/
#ifndef UNIV_HOTBACKUP
/**********************************************************************//**
Reads from an undo log record the record type.
@return record type */
UNIV_INLINE
ulint
trx_undo_rec_get_type(
/*==================*/
const trx_undo_rec_t* undo_rec) /*!< in: undo log record */
{
return(mach_read_from_1(undo_rec + 2) & (TRX_UNDO_CMPL_INFO_MULT - 1));
}
/**********************************************************************//**
Reads from an undo log record the record compiler info.
@return compiler info */
UNIV_INLINE
ulint
trx_undo_rec_get_cmpl_info(
/*=======================*/
const trx_undo_rec_t* undo_rec) /*!< in: undo log record */
{
return(mach_read_from_1(undo_rec + 2) / TRX_UNDO_CMPL_INFO_MULT);
}
/**********************************************************************//**
Returns TRUE if an undo log record contains an extern storage field.
@return TRUE if extern */
UNIV_INLINE
ibool
trx_undo_rec_get_extern_storage(
/*============================*/
const trx_undo_rec_t* undo_rec) /*!< in: undo log record */
{
if (mach_read_from_1(undo_rec + 2) & TRX_UNDO_UPD_EXTERN) {
return(TRUE);
}
return(FALSE);
}
/**********************************************************************//**
Reads the undo log record number.
@return undo no */
UNIV_INLINE
undo_no_t
trx_undo_rec_get_undo_no(
/*=====================*/
const trx_undo_rec_t* undo_rec) /*!< in: undo log record */
{
const byte* ptr;
ptr = undo_rec + 3;
return(mach_ull_read_much_compressed(ptr));
}
/**********************************************************************//**
Returns the start of the undo record data area.
@return offset to the data area */
UNIV_INLINE
ulint
trx_undo_rec_get_offset(
/*====================*/
undo_no_t undo_no) /*!< in: undo no read from node */
{
return (3 + mach_ull_get_much_compressed_size(undo_no));
}
/***********************************************************************//**
Copies the undo record to the heap.
@return own: copy of undo log record */
UNIV_INLINE
trx_undo_rec_t*
trx_undo_rec_copy(
/*==============*/
const trx_undo_rec_t* undo_rec, /*!< in: undo log record */
mem_heap_t* heap) /*!< in: heap where copied */
{
ulint len;
len = mach_read_from_2(undo_rec)
- ut_align_offset(undo_rec, UNIV_PAGE_SIZE);
ut_ad(len < UNIV_PAGE_SIZE);
return((trx_undo_rec_t*) mem_heap_dup(heap, undo_rec, len));
}
#endif /* !UNIV_HOTBACKUP */
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