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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
*****************************************************************************/
/******************************************************
Transaction undo log record
Created 3/26/1996 Heikki Tuuri
*******************************************************/
/**************************************************************************
Reads from an undo log record the record type. */
UNIV_INLINE
ulint
trx_undo_rec_get_type(
/*==================*/
/* out: record type */
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. */
UNIV_INLINE
ulint
trx_undo_rec_get_cmpl_info(
/*=======================*/
/* out: compiler info */
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. */
UNIV_INLINE
ibool
trx_undo_rec_get_extern_storage(
/*============================*/
/* out: TRUE if extern */
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. */
UNIV_INLINE
dulint
trx_undo_rec_get_undo_no(
/*=====================*/
/* out: undo no */
trx_undo_rec_t* undo_rec) /* in: undo log record */
{
byte* ptr;
ptr = undo_rec + 3;
return(mach_dulint_read_much_compressed(ptr));
}
/**************************************************************************
Returns the start of the undo record data area. */
UNIV_INLINE
byte*
trx_undo_rec_get_ptr(
/*=================*/
/* out: compiler info */
trx_undo_rec_t* undo_rec, /* in: undo log record */
dulint undo_no) /* in: undo no read from node */
{
return (((byte*) undo_rec) + 3
+ mach_dulint_get_much_compressed_size(undo_no));
}
/***************************************************************************
Copies the undo record to the heap. */
UNIV_INLINE
trx_undo_rec_t*
trx_undo_rec_copy(
/*==============*/
/* out, own: copy of undo log record */
trx_undo_rec_t* undo_rec, /* in: undo log record */
mem_heap_t* heap) /* in: heap where copied */
{
ulint len;
trx_undo_rec_t* rec_copy;
len = mach_read_from_2(undo_rec)
- ut_align_offset(undo_rec, UNIV_PAGE_SIZE);
rec_copy = mem_heap_alloc(heap, len);
ut_memcpy(rec_copy, undo_rec, len);
return(rec_copy);
}
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