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/*****************************************************************************
Copyright (c) 1995, 2014, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2017, 2019, MariaDB Corporation.
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.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
*****************************************************************************/
/**************************************************//**
@file include/mtr0mtr.ic
Mini-transaction buffer
Created 11/26/1995 Heikki Tuuri
*******************************************************/
#include "buf0buf.h"
/** Check if a mini-transaction is dirtying a clean page.
@return true if the mtr is dirtying a clean page. */
bool
mtr_t::is_block_dirtied(const buf_block_t* block)
{
ut_ad(buf_block_get_state(block) == BUF_BLOCK_FILE_PAGE);
ut_ad(block->page.buf_fix_count > 0);
/* It is OK to read oldest_modification because no
other thread can be performing a write of it and it
is only during write that the value is reset to 0. */
return(block->page.oldest_modification == 0);
}
/**
Pushes an object to an mtr memo stack. */
void
mtr_t::memo_push(void* object, mtr_memo_type_t type)
{
ut_ad(is_active());
ut_ad(object != NULL);
ut_ad(type >= MTR_MEMO_PAGE_S_FIX);
ut_ad(type <= MTR_MEMO_SX_LOCK);
ut_ad(ut_is_2pow(type));
/* If this mtr has x-fixed a clean page then we set
the made_dirty flag. This tells us if we need to
grab log_flush_order_mutex at mtr_commit so that we
can insert the dirtied page to the flush list. */
if ((type == MTR_MEMO_PAGE_X_FIX || type == MTR_MEMO_PAGE_SX_FIX)
&& !m_made_dirty) {
m_made_dirty = is_block_dirtied(
reinterpret_cast<const buf_block_t*>(object));
}
mtr_memo_slot_t* slot = m_memo.push<mtr_memo_slot_t*>(sizeof(*slot));
slot->type = type;
slot->object = object;
}
/**
Releases the (index tree) s-latch stored in an mtr memo after a
savepoint. */
void
mtr_t::release_s_latch_at_savepoint(
ulint savepoint,
rw_lock_t* lock)
{
ut_ad(is_active());
ut_ad(m_memo.size() > savepoint);
mtr_memo_slot_t* slot = m_memo.at<mtr_memo_slot_t*>(savepoint);
ut_ad(slot->object == lock);
ut_ad(slot->type == MTR_MEMO_S_LOCK);
rw_lock_s_unlock(lock);
slot->object = NULL;
}
/**
SX-latches the not yet latched block after a savepoint. */
void
mtr_t::sx_latch_at_savepoint(
ulint savepoint,
buf_block_t* block)
{
ut_ad(is_active());
ut_ad(m_memo.size() > savepoint);
ut_ad(!memo_contains_flagged(
block,
MTR_MEMO_PAGE_S_FIX
| MTR_MEMO_PAGE_X_FIX
| MTR_MEMO_PAGE_SX_FIX));
mtr_memo_slot_t* slot = m_memo.at<mtr_memo_slot_t*>(savepoint);
ut_ad(slot->object == block);
/* == RW_NO_LATCH */
ut_a(slot->type == MTR_MEMO_BUF_FIX);
rw_lock_sx_lock(&block->lock);
if (!m_made_dirty) {
m_made_dirty = is_block_dirtied(block);
}
slot->type = MTR_MEMO_PAGE_SX_FIX;
}
/**
X-latches the not yet latched block after a savepoint. */
void
mtr_t::x_latch_at_savepoint(
ulint savepoint,
buf_block_t* block)
{
ut_ad(is_active());
ut_ad(m_memo.size() > savepoint);
ut_ad(!memo_contains_flagged(
block,
MTR_MEMO_PAGE_S_FIX
| MTR_MEMO_PAGE_X_FIX
| MTR_MEMO_PAGE_SX_FIX));
mtr_memo_slot_t* slot = m_memo.at<mtr_memo_slot_t*>(savepoint);
ut_ad(slot->object == block);
/* == RW_NO_LATCH */
ut_a(slot->type == MTR_MEMO_BUF_FIX);
rw_lock_x_lock(&block->lock);
if (!m_made_dirty) {
m_made_dirty = is_block_dirtied(block);
}
slot->type = MTR_MEMO_PAGE_X_FIX;
}
/**
Releases the block in an mtr memo after a savepoint. */
void
mtr_t::release_block_at_savepoint(
ulint savepoint,
buf_block_t* block)
{
ut_ad(is_active());
mtr_memo_slot_t* slot = m_memo.at<mtr_memo_slot_t*>(savepoint);
ut_a(slot->object == block);
buf_block_unfix(reinterpret_cast<buf_block_t*>(block));
buf_page_release_latch(block, slot->type);
slot->object = NULL;
}
/**
Gets the logging mode of a mini-transaction.
@return logging mode: MTR_LOG_NONE, ... */
mtr_log_t
mtr_t::get_log_mode() const
{
ut_ad(m_log_mode >= MTR_LOG_ALL);
ut_ad(m_log_mode <= MTR_LOG_SHORT_INSERTS);
return m_log_mode;
}
/**
Changes the logging mode of a mini-transaction.
@return old mode */
mtr_log_t
mtr_t::set_log_mode(mtr_log_t mode)
{
ut_ad(mode >= MTR_LOG_ALL);
ut_ad(mode <= MTR_LOG_SHORT_INSERTS);
const mtr_log_t old_mode = m_log_mode;
switch (old_mode) {
case MTR_LOG_NO_REDO:
/* Once this mode is set, it must not be changed. */
ut_ad(mode == MTR_LOG_NO_REDO || mode == MTR_LOG_NONE);
return(old_mode);
case MTR_LOG_NONE:
if (mode == old_mode || mode == MTR_LOG_SHORT_INSERTS) {
/* Keep MTR_LOG_NONE. */
return(old_mode);
}
/* fall through */
case MTR_LOG_SHORT_INSERTS:
ut_ad(mode == MTR_LOG_ALL);
/* fall through */
case MTR_LOG_ALL:
/* MTR_LOG_NO_REDO can only be set before generating
any redo log records. */
ut_ad(mode != MTR_LOG_NO_REDO || m_n_log_recs == 0);
m_log_mode = mode;
return(old_mode);
}
ut_ad(0);
return(old_mode);
}
/**
Reads 1 - 4 bytes from a file page buffered in the buffer pool.
@return value read */
ulint
mtr_t::read_ulint(const byte* ptr, mlog_id_t type) const
{
ut_ad(is_active());
ut_ad(memo_contains_page_flagged(
ptr,
MTR_MEMO_PAGE_S_FIX
| MTR_MEMO_PAGE_X_FIX
| MTR_MEMO_PAGE_SX_FIX));
return(mach_read_ulint(ptr, type));
}
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