155 lines
5.5 KiB
Plaintext
155 lines
5.5 KiB
Plaintext
/*****************************************************************************
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Copyright (c) 1995, 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/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 "fsp0types.h"
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#include "mtr0mtr.h"
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#include "srv0srv.h"
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#ifndef UNIV_HOTBACKUP
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/** Inserts a modified block into the flush list. */
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void buf_flush_insert_into_flush_list(
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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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/** Inserts a modified block into the flush list in the right sorted position.
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This function is used by recovery, because there the modifications do not
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necessarily come in the order of lsn's. */
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void buf_flush_insert_sorted_into_flush_list(
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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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/** 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 buf_flush_note_modification(
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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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#ifdef UNIV_DEBUG
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{
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/* Allow write to proceed to shared temporary tablespace
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in read-only mode. */
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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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buf_pool_t *buf_pool = buf_pool_from_block(block);
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ut_ad(!buf_flush_list_mutex_own(buf_pool));
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}
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#endif /* UNIV_DEBUG */
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lizard::page_write_req_stat(block);
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mutex_enter(&block->mutex);
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if (end_lsn != 0) {
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ut_ad(block->page.newest_modification <= end_lsn);
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block->page.newest_modification = end_lsn;
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} else {
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/* Do nothing. This is the case with no-redo mtr and it
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possibly could re-modify some earlier dirtied page, in
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which case we don't want to change oldest/newest lsns.
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If that's not the case, we will set newest_modification
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within buf_flush_insert_into_flush_list call. That's
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because we can't read the value now, because we don't
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hold the flush list mutex yet. */
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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 if (start_lsn != 0) {
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ut_ad(block->page.oldest_modification <= start_lsn);
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}
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buf_page_mutex_exit(block);
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srv_stats.buf_pool_write_requests.inc();
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}
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/** This function should be called when recovery has modified a buffer page. */
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UNIV_INLINE
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void buf_flush_recv_note_modification(
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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 first mtr in a
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set of mtr's */
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lsn_t end_lsn) /*!< in: end lsn of the last mtr in the
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set of mtr's */
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{
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#ifdef UNIV_DEBUG
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{
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ut_ad(!srv_read_only_mode);
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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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buf_pool_t *buf_pool = buf_pool_from_block(block);
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ut_ad(!buf_flush_list_mutex_own(buf_pool));
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ut_ad(start_lsn != 0);
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ut_ad(block->page.newest_modification <= end_lsn);
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}
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#endif /* UNIV_DEBUG */
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buf_page_mutex_enter(block);
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block->page.newest_modification = end_lsn;
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if (!block->page.oldest_modification) {
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buf_pool_t *buf_pool = buf_pool_from_block(block);
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buf_flush_insert_sorted_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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buf_page_mutex_exit(block);
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}
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#endif /* !UNIV_HOTBACKUP */
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