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312569e2fd
At each mini-transaction commit, the log sequence number of the mini-transaction must be written to each modified page, so that it will be available in the FIL_PAGE_LSN field when the page is being read in crash recovery. InnoDB was unnecessarily allocating redundant storage for the field, in buf_page_t::newest_modification. Let us access FIL_PAGE_LSN directly. Furthermore, on ALTER TABLE...IMPORT TABLESPACE, let us write 0 to FIL_PAGE_LSN instead of using log_sys.lsn. buf_flush_init_for_writing(), buf_flush_update_zip_checksum(), fil_encrypt_buf_for_full_crc32(), fil_encrypt_buf(), fil_space_encrypt(): Remove the parameter lsn. buf_page_get_newest_modification(): Merge with the only caller. buf_tmp_reserve_compression_buf(), buf_tmp_page_encrypt(), buf_page_encrypt(): Define static in the same compilation unit with the only caller. PageConverter::m_current_lsn: Remove. Write 0 to FIL_PAGE_LSN on ALTER TABLE...IMPORT TABLESPACE.
87 lines
3.2 KiB
Text
87 lines
3.2 KiB
Text
/*****************************************************************************
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Copyright (c) 1995, 2015, 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 as published by the Free Software
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Foundation; version 2 of the License.
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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 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 Street, Fifth Floor, Boston, MA 02110-1335 USA
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*****************************************************************************/
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/**************************************************//**
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@file include/buf0flu.ic
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The database buffer pool flush algorithm
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Created 11/5/1995 Heikki Tuuri
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*******************************************************/
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#include "buf0buf.h"
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#include "mtr0mtr.h"
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#include "srv0srv.h"
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#include "fsp0types.h"
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/********************************************************************//**
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Inserts a modified block into the flush list. */
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void
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buf_flush_insert_into_flush_list(
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/*=============================*/
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buf_pool_t* buf_pool, /*!< buffer pool instance */
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buf_block_t* block, /*!< in/out: block which is modified */
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lsn_t lsn); /*!< in: oldest modification */
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/********************************************************************//**
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This function should be called at a mini-transaction commit, if a page was
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modified in it. Puts the block to the list of modified blocks, if it is not
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already in it. */
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UNIV_INLINE
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void
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buf_flush_note_modification(
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/*========================*/
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buf_block_t* block, /*!< in: block which is modified */
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lsn_t start_lsn, /*!< in: start lsn of the mtr that
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modified this block */
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lsn_t end_lsn, /*!< in: end lsn of the mtr that
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modified this block */
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FlushObserver* observer) /*!< in: flush observer */
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{
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mutex_enter(&block->mutex);
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ut_ad(!srv_read_only_mode
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|| fsp_is_system_temporary(block->page.id.space()));
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ut_ad(buf_block_get_state(block) == BUF_BLOCK_FILE_PAGE);
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ut_ad(block->page.buf_fix_count > 0);
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ut_ad(mach_read_from_8(block->frame + FIL_PAGE_LSN) <= end_lsn);
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mach_write_to_8(block->frame + FIL_PAGE_LSN, end_lsn);
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if (UNIV_LIKELY_NULL(block->page.zip.data)) {
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compile_time_assert(FIL_PAGE_LSN % 8 == 0);
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*reinterpret_cast<uint64_t*>(FIL_PAGE_LSN
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+ block->page.zip.data)
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= *reinterpret_cast<const uint64_t*>(FIL_PAGE_LSN
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+ block->frame);
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}
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/* Don't allow to set flush observer from non-null to null,
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or from one observer to another. */
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ut_ad(block->page.flush_observer == NULL
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|| block->page.flush_observer == observer);
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block->page.flush_observer = observer;
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if (block->page.oldest_modification == 0) {
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buf_pool_t* buf_pool = buf_pool_from_block(block);
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buf_flush_insert_into_flush_list(buf_pool, block, start_lsn);
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} else {
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ut_ad(block->page.oldest_modification <= start_lsn);
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}
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mutex_exit(&block->mutex);
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srv_stats.buf_pool_write_requests.inc();
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}
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