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/*****************************************************************************
Copyright (c) 1995, 2014, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2017, 2021, 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. */
inline bool mtr_t::is_block_dirtied(const buf_block_t *block)
{
ut_ad(block->page.in_file());
ut_ad(block->page.frame);
ut_ad(block->page.buf_fix_count());
return block->page.oldest_modification() <= 1;
}
/**
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_SPACE_S_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_sys.flush_order_mutex at mtr_t::commit() so that we
can insert the dirtied page into 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,
index_lock* 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);
lock->s_unlock();
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);
block->page.lock.u_lock();
ut_ad(!block->page.is_io_fixed());
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);
block->page.lock.x_lock();
ut_ad(!block->page.is_io_fixed());
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);
slot->object= nullptr;
block->page.unfix();
switch (slot->type) {
case MTR_MEMO_PAGE_S_FIX:
block->page.lock.s_unlock();
break;
case MTR_MEMO_PAGE_SX_FIX:
case MTR_MEMO_PAGE_X_FIX:
block->page.lock.u_or_x_unlock(slot->type == MTR_MEMO_PAGE_SX_FIX);
break;
default:
break;
}
}
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