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mariadb/storage/innobase/mtr/mtr0mtr.cc
Marko Mäkelä bb1d88b6dc Merge 11.4 into 11.8
2025-04-02 14:07:01 +03:00

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/*****************************************************************************
Copyright (c) 1995, 2017, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2017, 2023, 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 mtr/mtr0mtr.cc
Mini-transaction buffer
Created 11/26/1995 Heikki Tuuri
*******************************************************/
#include "mtr0log.h"
#include "buf0buf.h"
#include "buf0flu.h"
#include "page0types.h"
#include "log0crypt.h"
#ifdef BTR_CUR_HASH_ADAPT
# include "btr0sea.h"
#endif
#include "btr0cur.h"
#include "srv0start.h"
#include "log.h"
#include "mariadb_stats.h"
#include "my_cpu.h"
#ifdef HAVE_PMEM
void (*mtr_t::commit_logger)(mtr_t *, std::pair<lsn_t,page_flush_ahead>);
#endif
std::pair<lsn_t,mtr_t::page_flush_ahead> (*mtr_t::finisher)(mtr_t *, size_t);
unsigned mtr_t::spin_wait_delay;
void mtr_t::finisher_update()
{
ut_ad(log_sys.latch_have_wr());
#ifdef HAVE_PMEM
if (log_sys.is_mmap())
{
commit_logger= mtr_t::commit_log<true>;
finisher= spin_wait_delay
? mtr_t::finish_writer<true,true> : mtr_t::finish_writer<false,true>;
return;
}
commit_logger= mtr_t::commit_log<false>;
#endif
finisher=
(spin_wait_delay
? mtr_t::finish_writer<true,false> : mtr_t::finish_writer<false,false>);
}
void mtr_memo_slot_t::release() const
{
ut_ad(object);
switch (type) {
case MTR_MEMO_S_LOCK:
static_cast<index_lock*>(object)->s_unlock();
break;
case MTR_MEMO_X_LOCK:
case MTR_MEMO_SX_LOCK:
static_cast<index_lock*>(object)->
u_or_x_unlock(type == MTR_MEMO_SX_LOCK);
break;
case MTR_MEMO_SPACE_X_LOCK:
static_cast<fil_space_t*>(object)->set_committed_size();
static_cast<fil_space_t*>(object)->x_unlock();
break;
default:
buf_page_t *bpage= static_cast<buf_page_t*>(object);
ut_d(const auto s=)
bpage->unfix();
ut_ad(s < buf_page_t::READ_FIX || s >= buf_page_t::WRITE_FIX);
switch (type) {
case MTR_MEMO_PAGE_S_FIX:
bpage->lock.s_unlock();
break;
case MTR_MEMO_BUF_FIX:
break;
default:
ut_ad(type == MTR_MEMO_PAGE_SX_FIX ||
type == MTR_MEMO_PAGE_X_FIX ||
type == MTR_MEMO_PAGE_SX_MODIFY ||
type == MTR_MEMO_PAGE_X_MODIFY);
bpage->lock.u_or_x_unlock(type & MTR_MEMO_PAGE_SX_FIX);
}
}
}
/** Prepare to insert a modified blcok into flush_list.
@param lsn start LSN of the mini-transaction
@return insert position for insert_into_flush_list() */
inline buf_page_t *buf_pool_t::prepare_insert_into_flush_list(lsn_t lsn)
noexcept
{
ut_ad(recv_recovery_is_on() || log_sys.latch_have_any());
ut_ad(lsn >= log_sys.last_checkpoint_lsn);
mysql_mutex_assert_owner(&flush_list_mutex);
static_assert(log_t::FIRST_LSN >= 2, "compatibility");
rescan:
buf_page_t *prev= UT_LIST_GET_FIRST(flush_list);
if (prev)
{
lsn_t om= prev->oldest_modification();
if (om == 1)
{
delete_from_flush_list(prev);
goto rescan;
}
ut_ad(om > 2);
if (om <= lsn)
return nullptr;
while (buf_page_t *next= UT_LIST_GET_NEXT(list, prev))
{
om= next->oldest_modification();
if (om == 1)
{
delete_from_flush_list(next);
continue;
}
ut_ad(om > 2);
if (om <= lsn)
break;
prev= next;
}
flush_hp.adjust(prev);
}
return prev;
}
/** Insert a modified block into the flush list.
@param prev insert position (from prepare_insert_into_flush_list())
@param block modified block
@param lsn start LSN of the mini-transaction that modified the block */
inline void buf_pool_t::insert_into_flush_list(buf_page_t *prev,
buf_block_t *block, lsn_t lsn)
noexcept
{
ut_ad(!fsp_is_system_temporary(block->page.id().space()));
mysql_mutex_assert_owner(&flush_list_mutex);
MEM_CHECK_DEFINED(block->page.zip.data
? block->page.zip.data : block->page.frame,
block->physical_size());
if (const lsn_t old= block->page.oldest_modification())
{
if (old > 1)
return;
flush_hp.adjust(&block->page);
UT_LIST_REMOVE(flush_list, &block->page);
}
else
flush_list_bytes+= block->physical_size();
ut_ad(flush_list_bytes <= size_in_bytes);
if (prev)
UT_LIST_INSERT_AFTER(flush_list, prev, &block->page);
else
UT_LIST_ADD_FIRST(flush_list, &block->page);
block->page.set_oldest_modification(lsn);
}
mtr_t::mtr_t()= default;
mtr_t::~mtr_t()= default;
/** Start a mini-transaction. */
void mtr_t::start()
{
ut_ad(m_memo.empty());
ut_ad(!m_freed_pages);
ut_ad(!m_freed_space);
MEM_UNDEFINED(this, sizeof *this);
MEM_MAKE_DEFINED(&m_memo, sizeof m_memo);
MEM_MAKE_DEFINED(&m_freed_space, sizeof m_freed_space);
MEM_MAKE_DEFINED(&m_freed_pages, sizeof m_freed_pages);
ut_d(m_start= true);
ut_d(m_commit= false);
ut_d(m_freeing_tree= false);
m_last= nullptr;
m_last_offset= 0;
new(&m_log) mtr_buf_t();
m_made_dirty= false;
m_latch_ex= false;
m_modifications= false;
m_log_mode= MTR_LOG_ALL;
ut_d(m_user_space_id= TRX_SYS_SPACE);
m_user_space= nullptr;
m_commit_lsn= 0;
m_trim_pages= false;
}
/** Release the resources */
inline void mtr_t::release_resources()
{
ut_ad(is_active());
ut_ad(m_memo.empty());
m_log.erase();
ut_d(m_commit= true);
}
/** Handle any pages that were freed during the mini-transaction. */
void mtr_t::process_freed_pages()
{
if (m_freed_pages)
{
ut_ad(!m_freed_pages->empty());
ut_ad(m_freed_space);
ut_ad(m_freed_space->is_owner());
ut_ad(is_named_space(m_freed_space));
/* Update the last freed lsn */
m_freed_space->freed_range_mutex.lock();
m_freed_space->update_last_freed_lsn(m_commit_lsn);
if (!m_trim_pages)
for (const auto &range : *m_freed_pages)
m_freed_space->add_free_range(range);
else
m_freed_space->clear_freed_ranges();
m_freed_space->freed_range_mutex.unlock();
delete m_freed_pages;
m_freed_pages= nullptr;
m_freed_space= nullptr;
/* mtr_t::start() will reset m_trim_pages */
}
else
ut_ad(!m_freed_space);
}
ATTRIBUTE_COLD __attribute__((noinline))
/** Insert a modified block into buf_pool.flush_list on IMPORT TABLESPACE. */
static void insert_imported(buf_block_t *block)
{
if (block->page.oldest_modification() <= 1)
{
log_sys.latch.rd_lock(SRW_LOCK_CALL);
/* For unlogged mtrs (MTR_LOG_NO_REDO), we use the current system LSN. The
mtr that generated the LSN is either already committed or in mtr_t::commit.
Shared latch and relaxed atomics should be fine here as it is guaranteed
that both the current mtr and the mtr that generated the LSN would have
added the dirty pages to flush list before we access the minimum LSN during
checkpoint. log_checkpoint_low() acquires exclusive log_sys.latch before
commencing. */
const lsn_t lsn= log_sys.get_lsn();
mysql_mutex_lock(&buf_pool.flush_list_mutex);
buf_pool.insert_into_flush_list
(buf_pool.prepare_insert_into_flush_list(lsn), block, lsn);
log_sys.latch.rd_unlock();
mysql_mutex_unlock(&buf_pool.flush_list_mutex);
}
}
/** Release modified pages when no log was written. */
void mtr_t::release_unlogged()
{
ut_ad(m_log_mode == MTR_LOG_NO_REDO);
ut_ad(m_log.size() == 0);
process_freed_pages();
for (auto it= m_memo.rbegin(); it != m_memo.rend(); it++)
{
mtr_memo_slot_t &slot= *it;
ut_ad(slot.object);
switch (slot.type) {
case MTR_MEMO_S_LOCK:
static_cast<index_lock*>(slot.object)->s_unlock();
break;
case MTR_MEMO_SPACE_X_LOCK:
static_cast<fil_space_t*>(slot.object)->set_committed_size();
static_cast<fil_space_t*>(slot.object)->x_unlock();
break;
case MTR_MEMO_X_LOCK:
case MTR_MEMO_SX_LOCK:
static_cast<index_lock*>(slot.object)->
u_or_x_unlock(slot.type == MTR_MEMO_SX_LOCK);
break;
default:
buf_block_t *block= static_cast<buf_block_t*>(slot.object);
ut_d(const auto s=) block->page.unfix();
ut_ad(s >= buf_page_t::FREED);
ut_ad(s < buf_page_t::READ_FIX);
if (slot.type & MTR_MEMO_MODIFY)
{
ut_ad(slot.type == MTR_MEMO_PAGE_X_MODIFY ||
slot.type == MTR_MEMO_PAGE_SX_MODIFY);
ut_ad(block->page.id() < end_page_id);
insert_imported(block);
}
switch (slot.type) {
case MTR_MEMO_PAGE_S_FIX:
block->page.lock.s_unlock();
break;
case MTR_MEMO_BUF_FIX:
break;
default:
ut_ad(slot.type == MTR_MEMO_PAGE_SX_FIX ||
slot.type == MTR_MEMO_PAGE_X_FIX ||
slot.type == MTR_MEMO_PAGE_SX_MODIFY ||
slot.type == MTR_MEMO_PAGE_X_MODIFY);
block->page.lock.u_or_x_unlock(slot.type & MTR_MEMO_PAGE_SX_FIX);
}
}
}
m_memo.clear();
}
void mtr_t::release()
{
for (auto it= m_memo.rbegin(); it != m_memo.rend(); it++)
it->release();
m_memo.clear();
}
inline lsn_t log_t::get_write_target() const
{
ut_ad(latch_have_any());
if (UNIV_LIKELY(buf_free_ok()))
return 0;
/* The LSN corresponding to the end of buf is
write_lsn - (first_lsn & 4095) + buf_free,
but we use simpler arithmetics to return a smaller write target in
order to minimize waiting in log_write_up_to(). */
ut_ad(max_buf_free >= 4096 * 4);
return write_lsn + max_buf_free / 2;
}
template<bool mmap>
void mtr_t::commit_log(mtr_t *mtr, std::pair<lsn_t,page_flush_ahead> lsns)
{
size_t modified= 0;
const lsn_t write_lsn= mmap ? 0 : log_sys.get_write_target();
if (mtr->m_made_dirty)
{
auto it= mtr->m_memo.rbegin();
mysql_mutex_lock(&buf_pool.flush_list_mutex);
buf_page_t *const prev=
buf_pool.prepare_insert_into_flush_list(lsns.first);
while (it != mtr->m_memo.rend())
{
const mtr_memo_slot_t &slot= *it++;
if (slot.type & MTR_MEMO_MODIFY)
{
ut_ad(slot.type == MTR_MEMO_PAGE_X_MODIFY ||
slot.type == MTR_MEMO_PAGE_SX_MODIFY);
modified++;
buf_block_t *b= static_cast<buf_block_t*>(slot.object);
ut_ad(b->page.id() < end_page_id);
ut_d(const auto s= b->page.state());
ut_ad(s > buf_page_t::FREED);
ut_ad(s < buf_page_t::READ_FIX);
ut_ad(mach_read_from_8(b->page.frame + FIL_PAGE_LSN) <=
mtr->m_commit_lsn);
mach_write_to_8(b->page.frame + FIL_PAGE_LSN, mtr->m_commit_lsn);
if (UNIV_LIKELY_NULL(b->page.zip.data))
memcpy_aligned<8>(FIL_PAGE_LSN + b->page.zip.data,
FIL_PAGE_LSN + b->page.frame, 8);
buf_pool.insert_into_flush_list(prev, b, lsns.first);
}
}
ut_ad(modified);
buf_pool.flush_list_requests+= modified;
buf_pool.page_cleaner_wakeup();
mysql_mutex_unlock(&buf_pool.flush_list_mutex);
if (mtr->m_latch_ex)
{
log_sys.latch.wr_unlock();
mtr->m_latch_ex= false;
}
else
log_sys.latch.rd_unlock();
mtr->release();
}
else
{
if (mtr->m_latch_ex)
{
log_sys.latch.wr_unlock();
mtr->m_latch_ex= false;
}
else
log_sys.latch.rd_unlock();
for (auto it= mtr->m_memo.rbegin(); it != mtr->m_memo.rend(); )
{
const mtr_memo_slot_t &slot= *it++;
ut_ad(slot.object);
switch (slot.type) {
case MTR_MEMO_S_LOCK:
static_cast<index_lock*>(slot.object)->s_unlock();
break;
case MTR_MEMO_SPACE_X_LOCK:
static_cast<fil_space_t*>(slot.object)->set_committed_size();
static_cast<fil_space_t*>(slot.object)->x_unlock();
break;
case MTR_MEMO_X_LOCK:
case MTR_MEMO_SX_LOCK:
static_cast<index_lock*>(slot.object)->
u_or_x_unlock(slot.type == MTR_MEMO_SX_LOCK);
break;
default:
buf_page_t *bpage= static_cast<buf_page_t*>(slot.object);
ut_d(const auto s=)
bpage->unfix();
if (slot.type & MTR_MEMO_MODIFY)
{
ut_ad(slot.type == MTR_MEMO_PAGE_X_MODIFY ||
slot.type == MTR_MEMO_PAGE_SX_MODIFY);
ut_ad(bpage->oldest_modification() > 1);
ut_ad(bpage->oldest_modification() < mtr->m_commit_lsn);
ut_ad(bpage->id() < end_page_id);
ut_ad(s >= buf_page_t::FREED);
ut_ad(s < buf_page_t::READ_FIX);
ut_ad(mach_read_from_8(bpage->frame + FIL_PAGE_LSN) <=
mtr->m_commit_lsn);
mach_write_to_8(bpage->frame + FIL_PAGE_LSN, mtr->m_commit_lsn);
if (UNIV_LIKELY_NULL(bpage->zip.data))
memcpy_aligned<8>(FIL_PAGE_LSN + bpage->zip.data,
FIL_PAGE_LSN + bpage->frame, 8);
modified++;
}
switch (auto latch= slot.type & ~MTR_MEMO_MODIFY) {
case MTR_MEMO_PAGE_S_FIX:
bpage->lock.s_unlock();
continue;
case MTR_MEMO_PAGE_SX_FIX:
case MTR_MEMO_PAGE_X_FIX:
bpage->lock.u_or_x_unlock(latch == MTR_MEMO_PAGE_SX_FIX);
continue;
default:
ut_ad(latch == MTR_MEMO_BUF_FIX);
}
}
}
buf_pool.add_flush_list_requests(modified);
mtr->m_memo.clear();
}
mariadb_increment_pages_updated(modified);
if (UNIV_UNLIKELY(lsns.second != PAGE_FLUSH_NO))
buf_flush_ahead(mtr->m_commit_lsn, lsns.second == PAGE_FLUSH_SYNC);
if (!mmap && UNIV_UNLIKELY(write_lsn != 0))
log_write_up_to(write_lsn, false);
}
/** Commit a mini-transaction. */
void mtr_t::commit()
{
ut_ad(is_active());
/* This is a dirty read, for debugging. */
ut_ad(!m_modifications || !recv_no_log_write);
ut_ad(!m_modifications || m_log_mode != MTR_LOG_NONE);
ut_ad(!m_latch_ex);
if (m_modifications && (m_log_mode == MTR_LOG_NO_REDO || !m_log.empty()))
{
if (UNIV_UNLIKELY(!is_logged()))
{
release_unlogged();
goto func_exit;
}
ut_ad(!srv_read_only_mode);
std::pair<lsn_t,page_flush_ahead> lsns{do_write()};
process_freed_pages();
#ifdef HAVE_PMEM
commit_logger(this, lsns);
#else
commit_log<false>(this, lsns);
#endif
}
else
{
if (m_freed_pages)
{
ut_ad(!m_freed_pages->empty());
ut_ad(m_freed_space == fil_system.temp_space);
ut_ad(!m_trim_pages);
for (const auto &range : *m_freed_pages)
m_freed_space->add_free_range(range);
delete m_freed_pages;
m_freed_pages= nullptr;
m_freed_space= nullptr;
}
release();
}
func_exit:
release_resources();
}
void mtr_t::rollback_to_savepoint(ulint begin, ulint end)
{
ut_ad(end <= m_memo.size());
ut_ad(begin <= end);
ulint s= end;
while (s-- > begin)
{
const mtr_memo_slot_t &slot= m_memo[s];
ut_ad(slot.object);
/* This is intended for releasing latches on indexes or unmodified
buffer pool pages. */
ut_ad(slot.type <= MTR_MEMO_SX_LOCK);
ut_ad(!(slot.type & MTR_MEMO_MODIFY));
slot.release();
}
m_memo.erase(m_memo.begin() + begin, m_memo.begin() + end);
}
/** Set create_lsn. */
inline void fil_space_t::set_create_lsn(lsn_t lsn) noexcept
{
/* Concurrent log_checkpoint_low() must be impossible. */
ut_ad(latch.have_wr());
create_lsn= lsn;
}
/** Commit a mini-transaction that is shrinking a tablespace.
@param space tablespace that is being shrunk
@param size new size in pages */
void mtr_t::commit_shrink(fil_space_t &space, uint32_t size)
{
ut_ad(is_active());
ut_ad(!high_level_read_only);
ut_ad(m_modifications);
ut_ad(!m_memo.empty());
ut_ad(!recv_recovery_is_on());
ut_ad(m_log_mode == MTR_LOG_ALL);
ut_ad(!m_freed_pages);
log_write_and_flush_prepare();
m_latch_ex= true;
log_sys.latch.wr_lock(SRW_LOCK_CALL);
const lsn_t start_lsn= do_write().first;
ut_d(m_log.erase());
fil_node_t *file= UT_LIST_GET_LAST(space.chain);
mysql_mutex_lock(&fil_system.mutex);
ut_ad(file->is_open());
ut_ad(space.size >= size);
ut_ad(file->size >= space.size - size);
file->size-= space.size - size;
space.size= space.size_in_header= size;
if (space.id == TRX_SYS_SPACE)
srv_sys_space.set_last_file_size(file->size);
else
space.set_create_lsn(m_commit_lsn);
mysql_mutex_unlock(&fil_system.mutex);
space.clear_freed_ranges();
/* Durably write the reduced FSP_SIZE before truncating the data file. */
log_write_and_flush();
ut_ad(log_sys.latch_have_wr());
os_file_truncate(file->name, file->handle,
os_offset_t{file->size} << srv_page_size_shift, true);
space.clear_freed_ranges();
const page_id_t high{space.id, size};
size_t modified= 0;
auto it= m_memo.rbegin();
mysql_mutex_lock(&buf_pool.flush_list_mutex);
buf_page_t *const prev= buf_pool.prepare_insert_into_flush_list(start_lsn);
while (it != m_memo.rend())
{
mtr_memo_slot_t &slot= *it++;
ut_ad(slot.object);
if (slot.type == MTR_MEMO_SPACE_X_LOCK)
ut_ad(high.space() == static_cast<fil_space_t*>(slot.object)->id);
else
{
ut_ad(slot.type == MTR_MEMO_PAGE_X_MODIFY ||
slot.type == MTR_MEMO_PAGE_SX_MODIFY ||
slot.type == MTR_MEMO_PAGE_X_FIX ||
slot.type == MTR_MEMO_PAGE_SX_FIX);
buf_block_t *b= static_cast<buf_block_t*>(slot.object);
const page_id_t id{b->page.id()};
const auto s= b->page.state();
ut_ad(s > buf_page_t::FREED);
ut_ad(s < buf_page_t::READ_FIX);
ut_ad(b->page.frame);
ut_ad(mach_read_from_8(b->page.frame + FIL_PAGE_LSN) <= m_commit_lsn);
ut_ad(!b->page.zip.data); // we no not shrink ROW_FORMAT=COMPRESSED
if (id < high)
{
ut_ad(id.space() == high.space() ||
(id == page_id_t{0, TRX_SYS_PAGE_NO} &&
srv_is_undo_tablespace(high.space())));
if (slot.type & MTR_MEMO_MODIFY)
{
modified++;
mach_write_to_8(b->page.frame + FIL_PAGE_LSN, m_commit_lsn);
buf_pool.insert_into_flush_list(prev, b, start_lsn);
}
}
else
{
ut_ad(id.space() == high.space());
if (s >= buf_page_t::UNFIXED)
b->page.set_freed(s);
if (b->page.oldest_modification() > 1)
b->page.reset_oldest_modification();
slot.type= mtr_memo_type_t(slot.type & ~MTR_MEMO_MODIFY);
}
}
}
ut_ad(modified);
buf_pool.flush_list_requests+= modified;
buf_pool.page_cleaner_wakeup();
mysql_mutex_unlock(&buf_pool.flush_list_mutex);
log_sys.latch.wr_unlock();
m_latch_ex= false;
release();
release_resources();
}
/** Commit a mini-transaction that is deleting or renaming a file.
@param space tablespace that is being renamed or deleted
@param name new file name (nullptr=the file will be deleted)
@return whether the operation succeeded */
bool mtr_t::commit_file(fil_space_t &space, const char *name)
{
ut_ad(is_active());
ut_ad(!high_level_read_only);
ut_ad(m_modifications);
ut_ad(!m_made_dirty);
ut_ad(!recv_recovery_is_on());
ut_ad(m_log_mode == MTR_LOG_ALL);
ut_ad(UT_LIST_GET_LEN(space.chain) == 1);
ut_ad(!m_latch_ex);
m_latch_ex= true;
log_write_and_flush_prepare();
log_sys.latch.wr_lock(SRW_LOCK_CALL);
size_t size= m_log.size() + 5;
if (log_sys.is_encrypted())
{
/* We will not encrypt any FILE_ records, but we will reserve
a nonce at the end. */
size+= 8;
m_commit_lsn= log_sys.get_lsn();
}
else
m_commit_lsn= 0;
m_crc= 0;
m_log.for_each_block([this](const mtr_buf_t::block_t *b)
{ m_crc= my_crc32c(m_crc, b->begin(), b->used()); return true; });
finish_write(size);
if (!name && space.max_lsn)
{
ut_d(space.max_lsn= 0);
fil_system.named_spaces.remove(space);
}
/* Block log_checkpoint(). */
mysql_mutex_lock(&buf_pool.flush_list_mutex);
/* Durably write the log for the file system operation. */
log_write_and_flush();
log_sys.latch.wr_unlock();
m_latch_ex= false;
char *old_name= space.chain.start->name;
bool success= true;
if (name)
{
char *new_name= mem_strdup(name);
mysql_mutex_lock(&fil_system.mutex);
success= os_file_rename(innodb_data_file_key, old_name, name);
if (success)
space.chain.start->name= new_name;
else
old_name= new_name;
mysql_mutex_unlock(&fil_system.mutex);
ut_free(old_name);
}
mysql_mutex_unlock(&buf_pool.flush_list_mutex);
release_resources();
return success;
}
/** Commit a mini-transaction that did not modify any pages,
but generated some redo log on a higher level, such as
FILE_MODIFY records and an optional FILE_CHECKPOINT marker.
The caller must hold exclusive log_sys.latch.
This is to be used at log_checkpoint().
@param checkpoint_lsn the log sequence number of a checkpoint, or 0
@return current LSN */
ATTRIBUTE_COLD lsn_t mtr_t::commit_files(lsn_t checkpoint_lsn)
{
ut_ad(log_sys.latch_have_wr());
ut_ad(is_active());
ut_ad(m_log_mode == MTR_LOG_ALL);
ut_ad(!m_made_dirty);
ut_ad(m_memo.empty());
ut_ad(!srv_read_only_mode);
ut_ad(!m_freed_space);
ut_ad(!m_freed_pages);
ut_ad(!m_user_space);
ut_ad(!m_latch_ex);
m_latch_ex= true;
if (checkpoint_lsn)
{
byte *ptr= m_log.push<byte*>(3 + 8);
*ptr= FILE_CHECKPOINT | (2 + 8);
::memset(ptr + 1, 0, 2);
mach_write_to_8(ptr + 3, checkpoint_lsn);
}
size_t size= m_log.size() + 5;
if (log_sys.is_encrypted())
{
/* We will not encrypt any FILE_ records, but we will reserve
a nonce at the end. */
size+= 8;
m_commit_lsn= log_sys.get_lsn();
}
else
m_commit_lsn= 0;
m_crc= 0;
m_log.for_each_block([this](const mtr_buf_t::block_t *b)
{ m_crc= my_crc32c(m_crc, b->begin(), b->used()); return true; });
finish_write(size);
release_resources();
if (checkpoint_lsn)
DBUG_PRINT("ib_log",
("FILE_CHECKPOINT(" LSN_PF ") written at " LSN_PF,
checkpoint_lsn, m_commit_lsn));
return m_commit_lsn;
}
#ifdef UNIV_DEBUG
/** Check if a tablespace is associated with the mini-transaction
(needed for generating a FILE_MODIFY record)
@param[in] space tablespace
@return whether the mini-transaction is associated with the space */
bool
mtr_t::is_named_space(uint32_t space) const
{
ut_ad(!m_user_space || m_user_space->id != TRX_SYS_SPACE);
return !is_logged() || m_user_space_id == space ||
is_predefined_tablespace(space);
}
/** Check if a tablespace is associated with the mini-transaction
(needed for generating a FILE_MODIFY record)
@param[in] space tablespace
@return whether the mini-transaction is associated with the space */
bool mtr_t::is_named_space(const fil_space_t* space) const
{
ut_ad(!m_user_space || m_user_space->id != TRX_SYS_SPACE);
return !is_logged() || m_user_space == space ||
is_predefined_tablespace(space->id);
}
#endif /* UNIV_DEBUG */
/** Acquire a tablespace X-latch.
@param[in] space_id tablespace ID
@return the tablespace object (never NULL) */
fil_space_t *mtr_t::x_lock_space(uint32_t space_id)
{
fil_space_t* space;
ut_ad(is_active());
if (space_id == TRX_SYS_SPACE) {
space = fil_system.sys_space;
} else if ((space = m_user_space) && space_id == space->id) {
} else {
space = fil_space_get(space_id);
ut_ad(m_log_mode != MTR_LOG_NO_REDO
|| space->is_temporary() || space->is_being_imported());
}
ut_ad(space);
ut_ad(space->id == space_id);
x_lock_space(space);
return(space);
}
/** Acquire an exclusive tablespace latch.
@param space tablespace */
void mtr_t::x_lock_space(fil_space_t *space)
{
if (!memo_contains(*space))
{
memo_push(space, MTR_MEMO_SPACE_X_LOCK);
space->x_lock();
}
}
void mtr_t::release(const void *object)
{
ut_ad(is_active());
auto it=
std::find_if(m_memo.begin(), m_memo.end(),
[object](const mtr_memo_slot_t& slot)
{ return slot.object == object; });
ut_ad(it != m_memo.end());
ut_ad(!(it->type & MTR_MEMO_MODIFY));
it->release();
m_memo.erase(it, it + 1);
ut_ad(std::find_if(m_memo.begin(), m_memo.end(),
[object](const mtr_memo_slot_t& slot)
{ return slot.object == &object; }) == m_memo.end());
}
static time_t log_close_warn_time;
/** Display a warning that the log tail is overwriting the head,
making the server crash-unsafe. */
ATTRIBUTE_COLD static void log_overwrite_warning(lsn_t lsn)
{
if (log_sys.overwrite_warned)
return;
time_t t= time(nullptr);
if (difftime(t, log_close_warn_time) < 15)
return;
if (!log_sys.overwrite_warned)
log_sys.overwrite_warned= lsn;
log_close_warn_time= t;
sql_print_error("InnoDB: Crash recovery is broken due to"
" insufficient innodb_log_file_size;"
" last checkpoint LSN=" LSN_PF ", current LSN=" LSN_PF
"%s.",
lsn_t{log_sys.last_checkpoint_lsn}, lsn,
srv_shutdown_state > SRV_SHUTDOWN_INITIATED
? ". Shutdown is in progress" : "");
}
static ATTRIBUTE_NOINLINE void lsn_delay(size_t delay, size_t mult) noexcept
{
delay*= mult * 2; // GCC 13.2.0 -O2 targeting AMD64 wants to unroll twice
HMT_low();
do
MY_RELAX_CPU();
while (--delay);
HMT_medium();
}
#if defined __clang_major__ && __clang_major__ < 10
/* Only clang-10 introduced support for asm goto */
#elif defined __APPLE__
/* At least some versions of Apple Xcode do not support asm goto */
#elif defined __GNUC__ && (defined __i386__ || defined __x86_64__)
# if SIZEOF_SIZE_T == 8
# define LOCK_TSET \
__asm__ goto("lock btsq $63, %0\n\t" "jnc %l1" \
: : "m"(buf_free) : "cc", "memory" : got)
# else
# define LOCK_TSET \
__asm__ goto("lock btsl $31, %0\n\t" "jnc %l1" \
: : "m"(buf_free) : "cc", "memory" : got)
# endif
#elif defined _MSC_VER && (defined _M_IX86 || defined _M_X64)
# if SIZEOF_SIZE_T == 8
# define LOCK_TSET \
if (!_interlockedbittestandset64 \
(reinterpret_cast<volatile LONG64*>(&buf_free), 63)) return
# else
# define LOCK_TSET \
if (!_interlockedbittestandset \
(reinterpret_cast<volatile long*>(&buf_free), 31)) return
# endif
#endif
#ifdef LOCK_TSET
ATTRIBUTE_NOINLINE
void log_t::lsn_lock_bts() noexcept
{
LOCK_TSET;
{
const size_t m= mtr_t::spin_wait_delay;
constexpr size_t DELAY= 10, MAX_ITERATIONS= 10;
for (size_t delay_count= DELAY, delay_iterations= 1;;
lsn_delay(delay_iterations, m))
{
if (!(buf_free.load(std::memory_order_relaxed) & buf_free_LOCK))
LOCK_TSET;
if (!delay_count);
else if (delay_iterations < MAX_ITERATIONS)
delay_count= DELAY, delay_iterations++;
else
delay_count--;
}
}
# ifdef __GNUC__
got:
return;
# endif
}
inline
#else
ATTRIBUTE_NOINLINE
#endif
size_t log_t::lock_lsn() noexcept
{
#ifdef LOCK_TSET
lsn_lock_bts();
return ~buf_free_LOCK & buf_free.load(std::memory_order_relaxed);
# undef LOCK_TSET
#else
size_t b= buf_free.fetch_or(buf_free_LOCK, std::memory_order_acquire);
if (b & buf_free_LOCK)
{
const size_t m= mtr_t::spin_wait_delay;
constexpr size_t DELAY= 10, MAX_ITERATIONS= 10;
for (size_t delay_count= DELAY, delay_iterations= 1;
((b= buf_free.load(std::memory_order_relaxed)) & buf_free_LOCK) ||
(buf_free_LOCK & (b= buf_free.fetch_or(buf_free_LOCK,
std::memory_order_acquire)));
lsn_delay(delay_iterations, m))
if (!delay_count);
else if (delay_iterations < MAX_ITERATIONS)
delay_count= DELAY, delay_iterations++;
else
delay_count--;
}
return b;
#endif
}
template<bool spin>
ATTRIBUTE_COLD size_t log_t::append_prepare_wait(size_t b, bool ex, lsn_t lsn)
noexcept
{
waits++;
ut_ad(buf_free.load(std::memory_order_relaxed) ==
(spin ? (b | buf_free_LOCK) : b));
if (spin)
buf_free.store(b, std::memory_order_release);
else
lsn_lock.wr_unlock();
if (ex)
latch.wr_unlock();
else
latch.rd_unlock();
log_write_up_to(lsn, is_mmap());
if (ex)
latch.wr_lock(SRW_LOCK_CALL);
else
latch.rd_lock(SRW_LOCK_CALL);
if (spin)
return lock_lsn();
lsn_lock.wr_lock();
return buf_free.load(std::memory_order_relaxed);
}
/** Reserve space in the log buffer for appending data.
@tparam spin whether to use the spin-only lock_lsn()
@tparam mmap log_sys.is_mmap()
@param size total length of the data to append(), in bytes
@param ex whether log_sys.latch is exclusively locked
@return the start LSN and the buffer position for append() */
template<bool spin,bool mmap>
inline
std::pair<lsn_t,byte*> log_t::append_prepare(size_t size, bool ex) noexcept
{
ut_ad(ex ? latch_have_wr() : latch_have_rd());
ut_ad(mmap == is_mmap());
if (!spin)
lsn_lock.wr_lock();
size_t b{spin ? lock_lsn() : buf_free.load(std::memory_order_relaxed)};
write_to_buf++;
lsn_t l{lsn.load(std::memory_order_relaxed)}, end_lsn{l + size};
if (UNIV_UNLIKELY(mmap
? (end_lsn -
get_flushed_lsn(std::memory_order_relaxed)) > capacity()
: b + size >= buf_size))
{
b= append_prepare_wait<spin>(b, ex, l);
/* While flushing log, we had released the lsn lock and LSN could have
progressed in the meantime. */
l= lsn.load(std::memory_order_relaxed);
end_lsn= l + size;
}
size_t new_buf_free= b + size;
if (mmap && new_buf_free >= file_size)
new_buf_free-= size_t(capacity());
lsn.store(end_lsn, std::memory_order_relaxed);
if (UNIV_UNLIKELY(end_lsn >= last_checkpoint_lsn + log_capacity))
set_check_for_checkpoint(true);
byte *our_buf= buf;
if (spin)
buf_free.store(new_buf_free, std::memory_order_release);
else
{
buf_free.store(new_buf_free, std::memory_order_relaxed);
lsn_lock.wr_unlock();
}
return {l, our_buf + b};
}
/** Finish appending data to the log.
@param lsn the end LSN of the log record
@return whether buf_flush_ahead() will have to be invoked */
static mtr_t::page_flush_ahead log_close(lsn_t lsn) noexcept
{
ut_ad(log_sys.latch_have_any());
const lsn_t checkpoint_age= lsn - log_sys.last_checkpoint_lsn;
if (UNIV_UNLIKELY(checkpoint_age >= log_sys.log_capacity) &&
/* silence message on create_log_file() after the log had been deleted */
checkpoint_age != lsn)
log_overwrite_warning(lsn);
else if (UNIV_LIKELY(checkpoint_age <= log_sys.max_modified_age_async))
return mtr_t::PAGE_FLUSH_NO;
else if (UNIV_LIKELY(checkpoint_age <= log_sys.max_checkpoint_age))
return mtr_t::PAGE_FLUSH_ASYNC;
log_sys.set_check_for_checkpoint();
return mtr_t::PAGE_FLUSH_SYNC;
}
inline void mtr_t::page_checksum(const buf_page_t &bpage)
{
const byte *page= bpage.frame;
size_t size= srv_page_size;
if (UNIV_LIKELY_NULL(bpage.zip.data))
{
size= (UNIV_ZIP_SIZE_MIN >> 1) << bpage.zip.ssize;
switch (fil_page_get_type(bpage.zip.data)) {
case FIL_PAGE_TYPE_ALLOCATED:
case FIL_PAGE_INODE:
case FIL_PAGE_IBUF_BITMAP:
case FIL_PAGE_TYPE_FSP_HDR:
case FIL_PAGE_TYPE_XDES:
/* These are essentially uncompressed pages. */
break;
default:
page= bpage.zip.data;
}
}
/* We have to exclude from the checksum the normal
page checksum that is written by buf_flush_init_for_writing()
and FIL_PAGE_LSN which would be updated once we have actually
allocated the LSN.
Unfortunately, we cannot access fil_space_t easily here. In order to
be compatible with encrypted tablespaces in the pre-full_crc32
format we will unconditionally exclude the 8 bytes at
FIL_PAGE_FILE_FLUSH_LSN_OR_KEY_VERSION
a.k.a. FIL_RTREE_SPLIT_SEQ_NUM. */
const uint32_t checksum=
my_crc32c(my_crc32c(my_crc32c(0, page + FIL_PAGE_OFFSET,
FIL_PAGE_LSN - FIL_PAGE_OFFSET),
page + FIL_PAGE_TYPE, 2),
page + FIL_PAGE_SPACE_ID, size - (FIL_PAGE_SPACE_ID + 8));
byte *l= log_write<OPTION>(bpage.id(), nullptr, 5, true, 0);
*l++= OPT_PAGE_CHECKSUM;
mach_write_to_4(l, checksum);
m_log.close(l + 4);
}
std::pair<lsn_t,mtr_t::page_flush_ahead> mtr_t::do_write()
{
ut_ad(!recv_no_log_write);
ut_ad(is_logged());
ut_ad(m_log.size());
ut_ad(!m_latch_ex || log_sys.latch_have_wr());
ut_ad(!m_user_space ||
(m_user_space->id > 0 && m_user_space->id < SRV_SPACE_ID_UPPER_BOUND));
#ifndef DBUG_OFF
do
{
if (m_log_mode != MTR_LOG_ALL ||
_db_keyword_(nullptr, "skip_page_checksum", 1))
continue;
for (const mtr_memo_slot_t& slot : m_memo)
if (slot.type & MTR_MEMO_MODIFY)
{
const buf_page_t &b= *static_cast<const buf_page_t*>(slot.object);
if (!b.is_freed())
page_checksum(b);
}
}
while (0);
#endif
size_t len= m_log.size() + 5;
ut_ad(len > 5);
if (log_sys.is_encrypted())
{
len+= 8;
encrypt();
}
else
{
m_crc= 0;
m_commit_lsn= 0;
m_log.for_each_block([this](const mtr_buf_t::block_t *b)
{ m_crc= my_crc32c(m_crc, b->begin(), b->used()); return true; });
}
if (!m_latch_ex)
log_sys.latch.rd_lock(SRW_LOCK_CALL);
if (UNIV_UNLIKELY(m_user_space && !m_user_space->max_lsn &&
!srv_is_undo_tablespace((m_user_space->id))))
{
if (!m_latch_ex)
{
m_latch_ex= true;
log_sys.latch.rd_unlock();
log_sys.latch.wr_lock(SRW_LOCK_CALL);
if (UNIV_UNLIKELY(m_user_space->max_lsn != 0))
goto func_exit;
}
name_write();
}
func_exit:
return finish_write(len);
}
inline void log_t::resize_write(lsn_t lsn, const byte *end, size_t len,
size_t seq) noexcept
{
ut_ad(latch_have_any());
if (UNIV_LIKELY_NULL(resize_buf))
{
ut_ad(end >= buf);
end-= len;
size_t s;
#ifdef HAVE_PMEM
if (!resize_flush_buf)
{
ut_ad(is_mmap());
lsn_lock.wr_lock();
const size_t resize_capacity{resize_target - START_OFFSET};
{
const lsn_t resizing{resize_in_progress()};
/* For memory-mapped log, log_t::resize_start() would never
set log_sys.resize_lsn to less than log_sys.lsn. It cannot
execute concurrently with this thread, because we are holding
log_sys.latch and it would hold an exclusive log_sys.latch. */
if (UNIV_UNLIKELY(lsn < resizing))
{
/* This function may execute in multiple concurrent threads
that hold a shared log_sys.latch. Before we got lsn_lock,
another thread could have executed resize_lsn.store(lsn) below
with a larger lsn than ours.
append_prepare() guarantees that the concurrent writes
cannot overlap, that is, our entire log must be discarded.
Besides, incomplete mini-transactions cannot be parsed anyway. */
ut_ad(resizing >= lsn + len);
goto mmap_done;
}
s= START_OFFSET;
if (UNIV_UNLIKELY(lsn - resizing + len >= resize_capacity))
{
resize_lsn.store(lsn, std::memory_order_relaxed);
lsn= 0;
}
else
{
lsn-= resizing;
s+= lsn;
}
}
ut_ad(s + len <= resize_target);
if (UNIV_UNLIKELY(end < &buf[START_OFFSET]))
{
/* The source buffer (log_sys.buf) wrapped around */
ut_ad(end + capacity() < &buf[file_size]);
ut_ad(end + len >= &buf[START_OFFSET]);
ut_ad(end + capacity() + len >= &buf[file_size]);
size_t l= size_t(buf - (end - START_OFFSET));
memcpy(resize_buf + s, end + capacity(), l);
memcpy(resize_buf + s + l, &buf[START_OFFSET], len - l);
}
else
{
ut_ad(end + len <= &buf[file_size]);
memcpy(resize_buf + s, end, len);
}
s+= len - seq;
/* Always set the sequence bit. If the resized log were to wrap around,
we will advance resize_lsn. */
ut_ad(resize_buf[s] <= 1);
resize_buf[s]= 1;
mmap_done:
lsn_lock.wr_unlock();
}
else
#endif
{
ut_ad(resize_flush_buf);
s= end - buf;
ut_ad(s + len <= buf_size);
memcpy(resize_buf + s, end, len);
s+= len - seq;
/* Always set the sequence bit. If the resized log were to wrap around,
we will advance resize_lsn. */
ut_ad(resize_buf[s] <= 1);
resize_buf[s]= 1;
}
}
}
inline void log_t::append(byte *&d, const void *s, size_t size) noexcept
{
ut_ad(log_sys.latch_have_any());
ut_ad(d + size <= log_sys.buf +
(log_sys.is_mmap() ? log_sys.file_size : log_sys.buf_size));
memcpy(d, s, size);
d+= size;
}
template<bool spin,bool mmap>
std::pair<lsn_t,mtr_t::page_flush_ahead>
mtr_t::finish_writer(mtr_t *mtr, size_t len)
{
ut_ad(log_sys.is_latest());
ut_ad(!recv_no_log_write);
ut_ad(mtr->is_logged());
ut_ad(mtr->m_latch_ex ? log_sys.latch_have_wr() : log_sys.latch_have_rd());
const size_t size{mtr->m_commit_lsn ? 5U + 8U : 5U};
std::pair<lsn_t, byte*> start=
log_sys.append_prepare<spin,mmap>(len, mtr->m_latch_ex);
if (!mmap)
{
mtr->m_log.for_each_block([&start](const mtr_buf_t::block_t *b)
{ log_sys.append(start.second, b->begin(), b->used()); return true; });
write_trailer:
*start.second++= log_sys.get_sequence_bit(start.first + len - size);
if (mtr->m_commit_lsn)
{
mach_write_to_8(start.second, mtr->m_commit_lsn);
mtr->m_crc= my_crc32c(mtr->m_crc, start.second, 8);
start.second+= 8;
}
mach_write_to_4(start.second, mtr->m_crc);
start.second+= 4;
}
else
{
if (UNIV_LIKELY(start.second + len <= &log_sys.buf[log_sys.file_size]))
{
mtr->m_log.for_each_block([&start](const mtr_buf_t::block_t *b)
{ log_sys.append(start.second, b->begin(), b->used()); return true; });
goto write_trailer;
}
mtr->m_log.for_each_block([&start](const mtr_buf_t::block_t *b)
{
size_t size{b->used()};
const size_t size_left(&log_sys.buf[log_sys.file_size] - start.second);
const byte *src= b->begin();
if (size > size_left)
{
::memcpy(start.second, src, size_left);
start.second= &log_sys.buf[log_sys.START_OFFSET];
src+= size_left;
size-= size_left;
}
::memcpy(start.second, src, size);
start.second+= size;
return true;
});
const size_t size_left(&log_sys.buf[log_sys.file_size] - start.second);
if (size_left > size)
goto write_trailer;
byte tail[5 + 8];
tail[0]= log_sys.get_sequence_bit(start.first + len - size);
if (mtr->m_commit_lsn)
{
mach_write_to_8(tail + 1, mtr->m_commit_lsn);
mtr->m_crc= my_crc32c(mtr->m_crc, tail + 1, 8);
mach_write_to_4(tail + 9, mtr->m_crc);
}
else
mach_write_to_4(tail + 1, mtr->m_crc);
::memcpy(start.second, tail, size_left);
::memcpy(log_sys.buf + log_sys.START_OFFSET, tail + size_left,
size - size_left);
start.second= log_sys.buf +
((size >= size_left) ? log_sys.START_OFFSET : log_sys.file_size) +
(size - size_left);
}
log_sys.resize_write(start.first, start.second, len, size);
mtr->m_commit_lsn= start.first + len;
return {start.first, log_close(mtr->m_commit_lsn)};
}
bool mtr_t::have_x_latch(const buf_block_t &block) const
{
ut_d(const mtr_memo_slot_t *found= nullptr);
for (const mtr_memo_slot_t &slot : m_memo)
{
if (slot.object != &block)
continue;
ut_d(found= &slot);
if (!(slot.type & MTR_MEMO_PAGE_X_FIX))
continue;
ut_ad(block.page.lock.have_x());
return true;
}
ut_ad(!found);
return false;
}
bool mtr_t::have_u_or_x_latch(const buf_block_t &block) const
{
for (const mtr_memo_slot_t &slot : m_memo)
{
if (slot.object == &block &&
slot.type & (MTR_MEMO_PAGE_X_FIX | MTR_MEMO_PAGE_SX_FIX))
{
ut_ad(block.page.lock.have_u_or_x());
return true;
}
}
return false;
}
/** Check if we are holding exclusive tablespace latch
@param space tablespace to search for
@return whether space.latch is being held */
bool mtr_t::memo_contains(const fil_space_t& space) const
{
for (const mtr_memo_slot_t &slot : m_memo)
{
if (slot.object == &space && slot.type == MTR_MEMO_SPACE_X_LOCK)
{
ut_ad(space.is_owner());
return true;
}
}
return false;
}
buf_block_t *mtr_t::page_lock_upgrade(const buf_block_t &block) noexcept
{
ut_ad(block.page.lock.have_x());
for (mtr_memo_slot_t &slot : m_memo)
if (slot.object == &block && slot.type & MTR_MEMO_PAGE_SX_FIX)
slot.type= mtr_memo_type_t(slot.type ^
(MTR_MEMO_PAGE_SX_FIX | MTR_MEMO_PAGE_X_FIX));
#ifdef BTR_CUR_HASH_ADAPT
ut_d(if (dict_index_t *index= block.index))
ut_ad(!index->freed());
#endif /* BTR_CUR_HASH_ADAPT */
return const_cast<buf_block_t*>(&block);
}
buf_block_t *mtr_t::page_lock(buf_block_t *block, ulint rw_latch) noexcept
{
mtr_memo_type_t fix_type;
ut_d(const auto state= block->page.state());
ut_ad(state > buf_page_t::FREED);
ut_ad(state > buf_page_t::WRITE_FIX || state < buf_page_t::READ_FIX);
switch (rw_latch) {
case RW_NO_LATCH:
fix_type= MTR_MEMO_BUF_FIX;
goto done;
case RW_S_LATCH:
fix_type= MTR_MEMO_PAGE_S_FIX;
block->page.lock.s_lock();
break;
case RW_SX_LATCH:
fix_type= MTR_MEMO_PAGE_SX_FIX;
block->page.lock.u_lock();
ut_ad(!block->page.is_io_fixed());
break;
default:
ut_ad(rw_latch == RW_X_LATCH);
fix_type= MTR_MEMO_PAGE_X_FIX;
if (block->page.lock.x_lock_upgraded())
{
block->unfix();
page_lock_upgrade(*block);
return block;
}
ut_ad(!block->page.is_io_fixed());
}
done:
ut_ad(state < buf_page_t::UNFIXED ||
page_id_t(page_get_space_id(block->page.frame),
page_get_page_no(block->page.frame)) == block->page.id());
memo_push(block, fix_type);
return block;
}
void mtr_t::upgrade_buffer_fix(ulint savepoint, rw_lock_type_t rw_latch)
noexcept
{
ut_ad(is_active());
mtr_memo_slot_t &slot= m_memo[savepoint];
ut_ad(slot.type == MTR_MEMO_BUF_FIX);
buf_block_t *block= static_cast<buf_block_t*>(slot.object);
ut_d(const auto state= block->page.state());
ut_ad(state > buf_page_t::FREED);
ut_ad(state > buf_page_t::WRITE_FIX || state < buf_page_t::READ_FIX);
static_assert(int{MTR_MEMO_PAGE_S_FIX} == int{RW_S_LATCH}, "");
static_assert(int{MTR_MEMO_PAGE_X_FIX} == int{RW_X_LATCH}, "");
static_assert(int{MTR_MEMO_PAGE_SX_FIX} == int{RW_SX_LATCH}, "");
slot.type= mtr_memo_type_t(rw_latch);
switch (rw_latch) {
default:
ut_ad("invalid state" == 0);
break;
case RW_S_LATCH:
block->page.lock.s_lock();
break;
case RW_SX_LATCH:
block->page.lock.u_lock();
ut_ad(!block->page.is_io_fixed());
break;
case RW_X_LATCH:
block->page.lock.x_lock();
ut_ad(!block->page.is_io_fixed());
}
ut_ad(page_id_t(page_get_space_id(block->page.frame),
page_get_page_no(block->page.frame)) == block->page.id());
}
#ifdef UNIV_DEBUG
/** Check if we are holding an rw-latch in this mini-transaction
@param lock latch to search for
@param type held latch type
@return whether (lock,type) is contained */
bool mtr_t::memo_contains(const index_lock &lock, mtr_memo_type_t type) const
{
ut_ad(type == MTR_MEMO_X_LOCK || type == MTR_MEMO_S_LOCK ||
type == MTR_MEMO_SX_LOCK);
for (const mtr_memo_slot_t &slot : m_memo)
{
if (slot.object == &lock && slot.type == type)
{
switch (type) {
case MTR_MEMO_X_LOCK:
ut_ad(lock.have_x());
break;
case MTR_MEMO_SX_LOCK:
ut_ad(lock.have_u_or_x());
break;
case MTR_MEMO_S_LOCK:
ut_ad(lock.have_s());
break;
default:
break;
}
return true;
}
}
return false;
}
/** Check if memo contains the given item.
@param object object to search
@param flags specify types of object (can be ORred) of
MTR_MEMO_PAGE_S_FIX ... values
@return true if contains */
bool mtr_t::memo_contains_flagged(const void *object, ulint flags) const
{
ut_ad(is_active());
ut_ad(flags);
/* Look for rw-lock-related and page-related flags. */
ut_ad(!(flags & ulint(~(MTR_MEMO_PAGE_S_FIX | MTR_MEMO_PAGE_X_FIX |
MTR_MEMO_PAGE_SX_FIX | MTR_MEMO_BUF_FIX |
MTR_MEMO_MODIFY | MTR_MEMO_X_LOCK |
MTR_MEMO_SX_LOCK | MTR_MEMO_S_LOCK))));
/* Either some rw-lock-related or page-related flags
must be specified, but not both at the same time. */
ut_ad(!(flags & (MTR_MEMO_PAGE_S_FIX | MTR_MEMO_PAGE_X_FIX |
MTR_MEMO_PAGE_SX_FIX | MTR_MEMO_BUF_FIX |
MTR_MEMO_MODIFY)) ==
!!(flags & (MTR_MEMO_X_LOCK | MTR_MEMO_SX_LOCK | MTR_MEMO_S_LOCK)));
for (const mtr_memo_slot_t &slot : m_memo)
{
if (object != slot.object)
continue;
auto f = flags & slot.type;
if (!f)
continue;
if (f & (MTR_MEMO_PAGE_S_FIX | MTR_MEMO_PAGE_SX_FIX | MTR_MEMO_PAGE_X_FIX))
{
const block_lock &lock= static_cast<const buf_page_t*>(object)->lock;
ut_ad(!(f & MTR_MEMO_PAGE_S_FIX) || lock.have_s());
ut_ad(!(f & MTR_MEMO_PAGE_SX_FIX) || lock.have_u_or_x());
ut_ad(!(f & MTR_MEMO_PAGE_X_FIX) || lock.have_x());
}
else
{
const index_lock &lock= *static_cast<const index_lock*>(object);
ut_ad(!(f & MTR_MEMO_S_LOCK) || lock.have_s());
ut_ad(!(f & MTR_MEMO_SX_LOCK) || lock.have_u_or_x());
ut_ad(!(f & MTR_MEMO_X_LOCK) || lock.have_x());
}
return true;
}
return false;
}
buf_block_t* mtr_t::memo_contains_page_flagged(const byte *ptr, ulint flags)
const
{
ptr= page_align(ptr);
for (const mtr_memo_slot_t &slot : m_memo)
{
ut_ad(slot.object);
if (!(flags & slot.type))
continue;
buf_page_t *bpage= static_cast<buf_page_t*>(slot.object);
if (ptr != bpage->frame)
continue;
ut_ad(!(slot.type & MTR_MEMO_PAGE_S_FIX) || bpage->lock.have_s());
ut_ad(!(slot.type & MTR_MEMO_PAGE_SX_FIX) || bpage->lock.have_u_or_x());
ut_ad(!(slot.type & MTR_MEMO_PAGE_X_FIX) || bpage->lock.have_x());
return static_cast<buf_block_t*>(slot.object);
}
return nullptr;
}
#endif /* UNIV_DEBUG */
/** Mark the given latched page as modified.
@param block page that will be modified */
void mtr_t::set_modified(const buf_block_t &block)
{
if (block.page.id().space() >= SRV_TMP_SPACE_ID)
{
const_cast<buf_block_t&>(block).page.set_temp_modified();
return;
}
m_modifications= true;
if (UNIV_UNLIKELY(m_log_mode == MTR_LOG_NONE))
return;
for (mtr_memo_slot_t &slot : m_memo)
{
if (slot.object == &block &&
slot.type & (MTR_MEMO_PAGE_X_FIX | MTR_MEMO_PAGE_SX_FIX))
{
if (slot.type & MTR_MEMO_MODIFY)
ut_ad(m_made_dirty || block.page.oldest_modification() > 1);
else
{
slot.type= static_cast<mtr_memo_type_t>(slot.type | MTR_MEMO_MODIFY);
if (!m_made_dirty)
m_made_dirty= block.page.oldest_modification() <= 1;
}
return;
}
}
/* This must be PageConverter::update_page() in IMPORT TABLESPACE. */
ut_ad(m_memo.empty());
ut_ad(!block.page.in_LRU_list);
}
void mtr_t::init(buf_block_t *b)
{
const page_id_t id{b->page.id()};
ut_ad(is_named_space(id.space()));
ut_ad(!m_freed_pages == !m_freed_space);
ut_ad(memo_contains_flagged(b, MTR_MEMO_PAGE_X_FIX));
if (id.space() >= SRV_TMP_SPACE_ID)
b->page.set_temp_modified();
else
{
for (mtr_memo_slot_t &slot : m_memo)
{
if (slot.object == b && slot.type & MTR_MEMO_PAGE_X_FIX)
{
slot.type= MTR_MEMO_PAGE_X_MODIFY;
m_modifications= true;
if (!m_made_dirty)
m_made_dirty= b->page.oldest_modification() <= 1;
goto found;
}
}
ut_ad("block not X-latched" == 0);
}
found:
if (UNIV_LIKELY_NULL(m_freed_space) &&
m_freed_space->id == id.space() &&
m_freed_pages->remove_if_exists(id.page_no()) &&
m_freed_pages->empty())
{
delete m_freed_pages;
m_freed_pages= nullptr;
m_freed_space= nullptr;
}
b->page.set_reinit(b->page.state() & buf_page_t::LRU_MASK);
if (!is_logged())
return;
m_log.close(log_write<INIT_PAGE>(id, &b->page));
m_last_offset= FIL_PAGE_TYPE;
}
/** Free a page.
@param space tablespace
@param offset offset of the page to be freed */
void mtr_t::free(const fil_space_t &space, uint32_t offset)
{
ut_ad(is_named_space(&space));
ut_ad(!m_freed_space || m_freed_space == &space);
buf_block_t *freed= nullptr;
const page_id_t id{space.id, offset};
for (auto it= m_memo.end(); it != m_memo.begin(); )
{
it--;
next:
mtr_memo_slot_t &slot= *it;
buf_block_t *block= static_cast<buf_block_t*>(slot.object);
ut_ad(block);
if (block == freed)
{
if (slot.type & (MTR_MEMO_PAGE_SX_FIX | MTR_MEMO_PAGE_X_FIX))
slot.type= MTR_MEMO_PAGE_X_FIX;
else
{
ut_ad(slot.type == MTR_MEMO_BUF_FIX);
block->page.unfix();
m_memo.erase(it, it + 1);
goto next;
}
}
else if (slot.type & (MTR_MEMO_PAGE_X_FIX | MTR_MEMO_PAGE_SX_FIX) &&
block->page.id() == id)
{
ut_ad(!block->page.is_freed());
ut_ad(!freed);
freed= block;
if (!(slot.type & MTR_MEMO_PAGE_X_FIX))
{
ut_d(bool upgraded=) block->page.lock.x_lock_upgraded();
ut_ad(upgraded);
}
if (id.space() >= SRV_TMP_SPACE_ID)
{
block->page.set_temp_modified();
slot.type= MTR_MEMO_PAGE_X_FIX;
}
else
{
slot.type= MTR_MEMO_PAGE_X_MODIFY;
if (!m_made_dirty)
m_made_dirty= block->page.oldest_modification() <= 1;
}
#ifdef BTR_CUR_HASH_ADAPT
if (block->index)
btr_search_drop_page_hash_index(block, nullptr);
#endif /* BTR_CUR_HASH_ADAPT */
block->page.set_freed(block->page.state());
}
}
if (is_logged())
m_log.close(log_write<FREE_PAGE>(id, nullptr));
}
void small_vector_base::grow_by_1(void *small, size_t element_size) noexcept
{
const size_t cap= Capacity*= 2, s= cap * element_size;
void *new_begin;
if (BeginX == small)
{
new_begin= my_malloc(PSI_NOT_INSTRUMENTED, s, MYF(0));
memcpy(new_begin, BeginX, s / 2);
TRASH_FREE(small, size() * element_size);
}
else
new_begin= my_realloc(PSI_NOT_INSTRUMENTED, BeginX, s, MYF(0));
BeginX= new_begin;
}
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