mirror of
https://github.com/MariaDB/server.git
synced 2025-01-31 19:11:46 +01:00
87 lines
2.2 KiB
Text
87 lines
2.2 KiB
Text
|
/******************************************************
|
||
|
|
Transaction undo log record
|
||
|
|
|
||
|
|
(c) 1996 Innobase Oy
|
||
|
|
|
||
|
|
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));
|
||
|
|
}
|
||
|
|
|
||
|
|
/***************************************************************************
|
||
|
|
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) + buf_frame_align(undo_rec)
|
||
|
|
- undo_rec;
|
||
|
|
rec_copy = mem_heap_alloc(heap, len);
|
||
|
|
|
||
|
|
ut_memcpy(rec_copy, undo_rec, len);
|
||
|
|
|
||
|
|
return(rec_copy);
|
||
|
|
}
|