100 lines
3.3 KiB
Plaintext
100 lines
3.3 KiB
Plaintext
/*****************************************************************************
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Copyright (c) 1996, 2018, Oracle and/or its affiliates. All Rights Reserved.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License, version 2.0, as published by the
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Free Software Foundation.
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This program is also distributed with certain software (including but not
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limited to OpenSSL) that is licensed under separate terms, as designated in a
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particular file or component or in included license documentation. The authors
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of MySQL hereby grant you an additional permission to link the program and
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your derivative works with the separately licensed software that they have
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included with MySQL.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License, version 2.0,
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for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*****************************************************************************/
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/** @file include/trx0rec.ic
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Transaction undo log record
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Created 3/26/1996 Heikki Tuuri
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*******************************************************/
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#ifndef UNIV_HOTBACKUP
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/** Reads from an undo log record the record type.
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@return record type */
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UNIV_INLINE
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ulint trx_undo_rec_get_type(
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const trx_undo_rec_t *undo_rec) /*!< in: undo log record */
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{
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return (mach_read_from_1(undo_rec + 2) & (TRX_UNDO_CMPL_INFO_MULT - 1));
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}
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/** Reads from an undo log record the record compiler info.
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@return compiler info */
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UNIV_INLINE
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ulint trx_undo_rec_get_cmpl_info(
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const trx_undo_rec_t *undo_rec) /*!< in: undo log record */
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{
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return (mach_read_from_1(undo_rec + 2) / TRX_UNDO_CMPL_INFO_MULT);
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}
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/** Returns TRUE if an undo log record contains an extern storage field.
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@return true if extern */
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UNIV_INLINE
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ibool trx_undo_rec_get_extern_storage(
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const trx_undo_rec_t *undo_rec) /*!< in: undo log record */
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{
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if (mach_read_from_1(undo_rec + 2) & TRX_UNDO_UPD_EXTERN) {
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return (TRUE);
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}
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return (FALSE);
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}
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/** Reads the undo log record number.
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@return undo no */
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UNIV_INLINE
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undo_no_t trx_undo_rec_get_undo_no(
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const trx_undo_rec_t *undo_rec) /*!< in: undo log record */
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{
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const byte *ptr = undo_rec + 2;
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uint8_t type_cmpl = mach_read_from_1(ptr);
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const bool blob_undo = type_cmpl & TRX_UNDO_MODIFY_BLOB;
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if (blob_undo) {
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/* The next record offset takes 2 bytes + 1 byte for
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type_cmpl flag + 1 byte for the new flag. Total 4 bytes.*/
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ptr = undo_rec + 4;
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} else {
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ptr = undo_rec + 3;
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}
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return (mach_u64_read_much_compressed(ptr));
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}
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/** Copies the undo record to the heap.
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@return own: copy of undo log record */
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UNIV_INLINE
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trx_undo_rec_t *trx_undo_rec_copy(
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const trx_undo_rec_t *undo_rec, /*!< in: undo log record */
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mem_heap_t *heap) /*!< in: heap where copied */
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{
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ulint len;
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len = mach_read_from_2(undo_rec) - ut_align_offset(undo_rec, UNIV_PAGE_SIZE);
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ut_ad(len < UNIV_PAGE_SIZE);
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return ((trx_undo_rec_t *)mem_heap_dup(heap, undo_rec, len));
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}
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#endif /* !UNIV_HOTBACKUP */
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