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mariadb/log/log0log.c
jyang 8610f05afe branches/innodb+: Merge branches/perfschema back into innodb+. 
Check in code change for implementing Performace Schema in InnoDB.
Objects in four different modules in InnoDB have been performance
instrumented, these modules are:
1) mutexes
2) rwlocks
3) file I/O
4) threads

We mostly preserved the existing APIs, but APIs would point to
instrumented function wrappers if performance schema is defined.
There are 4 different defines that controls the instrumentation of
each module.  The feature is off by default, and will be compiled in
with special build option, and requre configure option to turn it on
when server boots.  For more detail design and functional information,
please refer to performance schema wiki page.

rb://270 approved by Marko Mäkelä
2010-03-29 07:34:42 +00:00

3463 lines
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/*****************************************************************************
Copyright (c) 1995, 2010, Innobase Oy. All Rights Reserved.
Copyright (c) 2009, Google Inc.
Portions of this file contain modifications contributed and copyrighted by
Google, Inc. Those modifications are gratefully acknowledged and are described
briefly in the InnoDB documentation. The contributions by Google are
incorporated with their permission, and subject to the conditions contained in
the file COPYING.Google.
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., 59 Temple
Place, Suite 330, Boston, MA 02111-1307 USA
*****************************************************************************/
/**************************************************//**
@file log/log0log.c
Database log
Created 12/9/1995 Heikki Tuuri
*******************************************************/
#include "log0log.h"
#ifdef UNIV_NONINL
#include "log0log.ic"
#endif
#ifndef UNIV_HOTBACKUP
#include "mem0mem.h"
#include "buf0buf.h"
#include "buf0flu.h"
#include "srv0srv.h"
#include "log0recv.h"
#include "fil0fil.h"
#include "dict0boot.h"
#include "srv0srv.h"
#include "srv0start.h"
#include "trx0sys.h"
#include "trx0trx.h"
/*
General philosophy of InnoDB redo-logs:
1) Every change to a contents of a data page must be done
through mtr, which in mtr_commit() writes log records
to the InnoDB redo log.
2) Normally these changes are performed using a mlog_write_ulint()
or similar function.
3) In some page level operations only a code number of a
c-function and its parameters are written to the log to
reduce the size of the log.
3a) You should not add parameters to these kind of functions
(e.g. trx_undo_header_create(), trx_undo_insert_header_reuse())
3b) You should not add such functionality which either change
working when compared with the old or are dependent on data
outside of the page. These kind of functions should implement
self-contained page transformation and it should be unchanged
if you don't have very essential reasons to change log
semantics or format.
*/
/* Current free limit of space 0; protected by the log sys mutex; 0 means
uninitialized */
UNIV_INTERN ulint log_fsp_current_free_limit = 0;
/* Global log system variable */
UNIV_INTERN log_t* log_sys = NULL;
#ifdef UNIV_PFS_RWLOCK
UNIV_INTERN mysql_pfs_key_t checkpoint_lock_key;
UNIV_INTERN mysql_pfs_key_t archive_lock_key;
#endif /* UNIV_PFS_RWLOCK */
#ifdef UNIV_PFS_MUTEX
UNIV_INTERN mysql_pfs_key_t log_sys_mutex_key;
#endif /* UNIV_PFS_MUTEX */
#ifdef UNIV_DEBUG
UNIV_INTERN ibool log_do_write = TRUE;
#endif /* UNIV_DEBUG */
/* These control how often we print warnings if the last checkpoint is too
old */
UNIV_INTERN ibool log_has_printed_chkp_warning = FALSE;
UNIV_INTERN time_t log_last_warning_time;
#ifdef UNIV_LOG_ARCHIVE
/* Pointer to this variable is used as the i/o-message when we do i/o to an
archive */
UNIV_INTERN byte log_archive_io;
#endif /* UNIV_LOG_ARCHIVE */
/* A margin for free space in the log buffer before a log entry is catenated */
#define LOG_BUF_WRITE_MARGIN (4 * OS_FILE_LOG_BLOCK_SIZE)
/* Margins for free space in the log buffer after a log entry is catenated */
#define LOG_BUF_FLUSH_RATIO 2
#define LOG_BUF_FLUSH_MARGIN (LOG_BUF_WRITE_MARGIN + 4 * UNIV_PAGE_SIZE)
/* Margin for the free space in the smallest log group, before a new query
step which modifies the database, is started */
#define LOG_CHECKPOINT_FREE_PER_THREAD (4 * UNIV_PAGE_SIZE)
#define LOG_CHECKPOINT_EXTRA_FREE (8 * UNIV_PAGE_SIZE)
/* This parameter controls asynchronous making of a new checkpoint; the value
should be bigger than LOG_POOL_PREFLUSH_RATIO_SYNC */
#define LOG_POOL_CHECKPOINT_RATIO_ASYNC 32
/* This parameter controls synchronous preflushing of modified buffer pages */
#define LOG_POOL_PREFLUSH_RATIO_SYNC 16
/* The same ratio for asynchronous preflushing; this value should be less than
the previous */
#define LOG_POOL_PREFLUSH_RATIO_ASYNC 8
/* Extra margin, in addition to one log file, used in archiving */
#define LOG_ARCHIVE_EXTRA_MARGIN (4 * UNIV_PAGE_SIZE)
/* This parameter controls asynchronous writing to the archive */
#define LOG_ARCHIVE_RATIO_ASYNC 16
/* Codes used in unlocking flush latches */
#define LOG_UNLOCK_NONE_FLUSHED_LOCK 1
#define LOG_UNLOCK_FLUSH_LOCK 2
/* States of an archiving operation */
#define LOG_ARCHIVE_READ 1
#define LOG_ARCHIVE_WRITE 2
/******************************************************//**
Completes a checkpoint write i/o to a log file. */
static
void
log_io_complete_checkpoint(void);
/*============================*/
#ifdef UNIV_LOG_ARCHIVE
/******************************************************//**
Completes an archiving i/o. */
static
void
log_io_complete_archive(void);
/*=========================*/
#endif /* UNIV_LOG_ARCHIVE */
/****************************************************************//**
Sets the global variable log_fsp_current_free_limit. Also makes a checkpoint,
so that we know that the limit has been written to a log checkpoint field
on disk. */
UNIV_INTERN
void
log_fsp_current_free_limit_set_and_checkpoint(
/*==========================================*/
ulint limit) /*!< in: limit to set */
{
ibool success;
mutex_enter(&(log_sys->mutex));
log_fsp_current_free_limit = limit;
mutex_exit(&(log_sys->mutex));
/* Try to make a synchronous checkpoint */
success = FALSE;
while (!success) {
success = log_checkpoint(TRUE, TRUE);
}
}
/****************************************************************//**
Returns the oldest modified block lsn in the pool, or log_sys->lsn if none
exists.
@return LSN of oldest modification */
static
ib_uint64_t
log_buf_pool_get_oldest_modification(void)
/*======================================*/
{
ib_uint64_t lsn;
ut_ad(mutex_own(&(log_sys->mutex)));
lsn = buf_pool_get_oldest_modification();
if (!lsn) {
lsn = log_sys->lsn;
}
return(lsn);
}
/************************************************************//**
Opens the log for log_write_low. The log must be closed with log_close and
released with log_release.
@return start lsn of the log record */
UNIV_INTERN
ib_uint64_t
log_reserve_and_open(
/*=================*/
ulint len) /*!< in: length of data to be catenated */
{
log_t* log = log_sys;
ulint len_upper_limit;
#ifdef UNIV_LOG_ARCHIVE
ulint archived_lsn_age;
ulint dummy;
#endif /* UNIV_LOG_ARCHIVE */
#ifdef UNIV_DEBUG
ulint count = 0;
#endif /* UNIV_DEBUG */
ut_a(len < log->buf_size / 2);
loop:
mutex_enter(&(log->mutex));
ut_ad(!recv_no_log_write);
/* Calculate an upper limit for the space the string may take in the
log buffer */
len_upper_limit = LOG_BUF_WRITE_MARGIN + (5 * len) / 4;
if (log->buf_free + len_upper_limit > log->buf_size) {
mutex_exit(&(log->mutex));
/* Not enough free space, do a syncronous flush of the log
buffer */
log_buffer_flush_to_disk();
srv_log_waits++;
ut_ad(++count < 50);
goto loop;
}
#ifdef UNIV_LOG_ARCHIVE
if (log->archiving_state != LOG_ARCH_OFF) {
archived_lsn_age = log->lsn - log->archived_lsn;
if (archived_lsn_age + len_upper_limit
> log->max_archived_lsn_age) {
/* Not enough free archived space in log groups: do a
synchronous archive write batch: */
mutex_exit(&(log->mutex));
ut_ad(len_upper_limit <= log->max_archived_lsn_age);
log_archive_do(TRUE, &dummy);
ut_ad(++count < 50);
goto loop;
}
}
#endif /* UNIV_LOG_ARCHIVE */
#ifdef UNIV_LOG_DEBUG
log->old_buf_free = log->buf_free;
log->old_lsn = log->lsn;
#endif
return(log->lsn);
}
/************************************************************//**
Writes to the log the string given. It is assumed that the caller holds the
log mutex. */
UNIV_INTERN
void
log_write_low(
/*==========*/
byte* str, /*!< in: string */
ulint str_len) /*!< in: string length */
{
log_t* log = log_sys;
ulint len;
ulint data_len;
byte* log_block;
ut_ad(mutex_own(&(log->mutex)));
part_loop:
ut_ad(!recv_no_log_write);
/* Calculate a part length */
data_len = (log->buf_free % OS_FILE_LOG_BLOCK_SIZE) + str_len;
if (data_len <= OS_FILE_LOG_BLOCK_SIZE - LOG_BLOCK_TRL_SIZE) {
/* The string fits within the current log block */
len = str_len;
} else {
data_len = OS_FILE_LOG_BLOCK_SIZE - LOG_BLOCK_TRL_SIZE;
len = OS_FILE_LOG_BLOCK_SIZE
- (log->buf_free % OS_FILE_LOG_BLOCK_SIZE)
- LOG_BLOCK_TRL_SIZE;
}
ut_memcpy(log->buf + log->buf_free, str, len);
str_len -= len;
str = str + len;
log_block = ut_align_down(log->buf + log->buf_free,
OS_FILE_LOG_BLOCK_SIZE);
log_block_set_data_len(log_block, data_len);
if (data_len == OS_FILE_LOG_BLOCK_SIZE - LOG_BLOCK_TRL_SIZE) {
/* This block became full */
log_block_set_data_len(log_block, OS_FILE_LOG_BLOCK_SIZE);
log_block_set_checkpoint_no(log_block,
log_sys->next_checkpoint_no);
len += LOG_BLOCK_HDR_SIZE + LOG_BLOCK_TRL_SIZE;
log->lsn += len;
/* Initialize the next block header */
log_block_init(log_block + OS_FILE_LOG_BLOCK_SIZE, log->lsn);
} else {
log->lsn += len;
}
log->buf_free += len;
ut_ad(log->buf_free <= log->buf_size);
if (str_len > 0) {
goto part_loop;
}
srv_log_write_requests++;
}
/************************************************************//**
Closes the log.
@return lsn */
UNIV_INTERN
ib_uint64_t
log_close(void)
/*===========*/
{
byte* log_block;
ulint first_rec_group;
ib_uint64_t oldest_lsn;
ib_uint64_t lsn;
log_t* log = log_sys;
ib_uint64_t checkpoint_age;
ut_ad(mutex_own(&(log->mutex)));
ut_ad(!recv_no_log_write);
lsn = log->lsn;
log_block = ut_align_down(log->buf + log->buf_free,
OS_FILE_LOG_BLOCK_SIZE);
first_rec_group = log_block_get_first_rec_group(log_block);
if (first_rec_group == 0) {
/* We initialized a new log block which was not written
full by the current mtr: the next mtr log record group
will start within this block at the offset data_len */
log_block_set_first_rec_group(
log_block, log_block_get_data_len(log_block));
}
if (log->buf_free > log->max_buf_free) {
log->check_flush_or_checkpoint = TRUE;
}
checkpoint_age = lsn - log->last_checkpoint_lsn;
if (checkpoint_age >= log->log_group_capacity) {
/* TODO: split btr_store_big_rec_extern_fields() into small
steps so that we can release all latches in the middle, and
call log_free_check() to ensure we never write over log written
after the latest checkpoint. In principle, we should split all
big_rec operations, but other operations are smaller. */
if (!log_has_printed_chkp_warning
|| difftime(time(NULL), log_last_warning_time) > 15) {
log_has_printed_chkp_warning = TRUE;
log_last_warning_time = time(NULL);
ut_print_timestamp(stderr);
fprintf(stderr,
" InnoDB: ERROR: the age of the last"
" checkpoint is %lu,\n"
"InnoDB: which exceeds the log group"
" capacity %lu.\n"
"InnoDB: If you are using big"
" BLOB or TEXT rows, you must set the\n"
"InnoDB: combined size of log files"
" at least 10 times bigger than the\n"
"InnoDB: largest such row.\n",
(ulong) checkpoint_age,
(ulong) log->log_group_capacity);
}
}
if (checkpoint_age <= log->max_modified_age_async) {
goto function_exit;
}
oldest_lsn = buf_pool_get_oldest_modification();
if (!oldest_lsn
|| lsn - oldest_lsn > log->max_modified_age_async
|| checkpoint_age > log->max_checkpoint_age_async) {
log->check_flush_or_checkpoint = TRUE;
}
function_exit:
#ifdef UNIV_LOG_DEBUG
log_check_log_recs(log->buf + log->old_buf_free,
log->buf_free - log->old_buf_free, log->old_lsn);
#endif
return(lsn);
}
#ifdef UNIV_LOG_ARCHIVE
/******************************************************//**
Pads the current log block full with dummy log records. Used in producing
consistent archived log files. */
static
void
log_pad_current_log_block(void)
/*===========================*/
{
byte b = MLOG_DUMMY_RECORD;
ulint pad_length;
ulint i;
ib_uint64_t lsn;
/* We retrieve lsn only because otherwise gcc crashed on HP-UX */
lsn = log_reserve_and_open(OS_FILE_LOG_BLOCK_SIZE);
pad_length = OS_FILE_LOG_BLOCK_SIZE
- (log_sys->buf_free % OS_FILE_LOG_BLOCK_SIZE)
- LOG_BLOCK_TRL_SIZE;
for (i = 0; i < pad_length; i++) {
log_write_low(&b, 1);
}
lsn = log_sys->lsn;
log_close();
log_release();
ut_a(lsn % OS_FILE_LOG_BLOCK_SIZE == LOG_BLOCK_HDR_SIZE);
}
#endif /* UNIV_LOG_ARCHIVE */
/******************************************************//**
Calculates the data capacity of a log group, when the log file headers are not
included.
@return capacity in bytes */
UNIV_INTERN
ulint
log_group_get_capacity(
/*===================*/
const log_group_t* group) /*!< in: log group */
{
ut_ad(mutex_own(&(log_sys->mutex)));
return((group->file_size - LOG_FILE_HDR_SIZE) * group->n_files);
}
/******************************************************//**
Calculates the offset within a log group, when the log file headers are not
included.
@return size offset (<= offset) */
UNIV_INLINE
ulint
log_group_calc_size_offset(
/*=======================*/
ulint offset, /*!< in: real offset within the
log group */
const log_group_t* group) /*!< in: log group */
{
ut_ad(mutex_own(&(log_sys->mutex)));
return(offset - LOG_FILE_HDR_SIZE * (1 + offset / group->file_size));
}
/******************************************************//**
Calculates the offset within a log group, when the log file headers are
included.
@return real offset (>= offset) */
UNIV_INLINE
ulint
log_group_calc_real_offset(
/*=======================*/
ulint offset, /*!< in: size offset within the
log group */
const log_group_t* group) /*!< in: log group */
{
ut_ad(mutex_own(&(log_sys->mutex)));
return(offset + LOG_FILE_HDR_SIZE
* (1 + offset / (group->file_size - LOG_FILE_HDR_SIZE)));
}
/******************************************************//**
Calculates the offset of an lsn within a log group.
@return offset within the log group */
static
ulint
log_group_calc_lsn_offset(
/*======================*/
ib_uint64_t lsn, /*!< in: lsn, must be within 4 GB of
group->lsn */
const log_group_t* group) /*!< in: log group */
{
ib_uint64_t gr_lsn;
ib_int64_t gr_lsn_size_offset;
ib_int64_t difference;
ib_int64_t group_size;
ib_int64_t offset;
ut_ad(mutex_own(&(log_sys->mutex)));
/* If total log file size is > 2 GB we can easily get overflows
with 32-bit integers. Use 64-bit integers instead. */
gr_lsn = group->lsn;
gr_lsn_size_offset = (ib_int64_t)
log_group_calc_size_offset(group->lsn_offset, group);
group_size = (ib_int64_t) log_group_get_capacity(group);
if (lsn >= gr_lsn) {
difference = (ib_int64_t) (lsn - gr_lsn);
} else {
difference = (ib_int64_t) (gr_lsn - lsn);
difference = difference % group_size;
difference = group_size - difference;
}
offset = (gr_lsn_size_offset + difference) % group_size;
ut_a(offset < (((ib_int64_t) 1) << 32)); /* offset must be < 4 GB */
/* fprintf(stderr,
"Offset is %lu gr_lsn_offset is %lu difference is %lu\n",
(ulint)offset,(ulint)gr_lsn_size_offset, (ulint)difference);
*/
return(log_group_calc_real_offset((ulint)offset, group));
}
#endif /* !UNIV_HOTBACKUP */
#ifdef UNIV_DEBUG
UNIV_INTERN ibool log_debug_writes = FALSE;
#endif /* UNIV_DEBUG */
/*******************************************************************//**
Calculates where in log files we find a specified lsn.
@return log file number */
UNIV_INTERN
ulint
log_calc_where_lsn_is(
/*==================*/
ib_int64_t* log_file_offset, /*!< out: offset in that file
(including the header) */
ib_uint64_t first_header_lsn, /*!< in: first log file start
lsn */
ib_uint64_t lsn, /*!< in: lsn whose position to
determine */
ulint n_log_files, /*!< in: total number of log
files */
ib_int64_t log_file_size) /*!< in: log file size
(including the header) */
{
ib_int64_t capacity = log_file_size - LOG_FILE_HDR_SIZE;
ulint file_no;
ib_int64_t add_this_many;
if (lsn < first_header_lsn) {
add_this_many = 1 + (first_header_lsn - lsn)
/ (capacity * (ib_int64_t)n_log_files);
lsn += add_this_many
* capacity * (ib_int64_t)n_log_files;
}
ut_a(lsn >= first_header_lsn);
file_no = ((ulint)((lsn - first_header_lsn) / capacity))
% n_log_files;
*log_file_offset = (lsn - first_header_lsn) % capacity;
*log_file_offset = *log_file_offset + LOG_FILE_HDR_SIZE;
return(file_no);
}
#ifndef UNIV_HOTBACKUP
/********************************************************//**
Sets the field values in group to correspond to a given lsn. For this function
to work, the values must already be correctly initialized to correspond to
some lsn, for instance, a checkpoint lsn. */
UNIV_INTERN
void
log_group_set_fields(
/*=================*/
log_group_t* group, /*!< in/out: group */
ib_uint64_t lsn) /*!< in: lsn for which the values should be
set */
{
group->lsn_offset = log_group_calc_lsn_offset(lsn, group);
group->lsn = lsn;
}
/*****************************************************************//**
Calculates the recommended highest values for lsn - last_checkpoint_lsn,
lsn - buf_get_oldest_modification(), and lsn - max_archive_lsn_age.
@return error value FALSE if the smallest log group is too small to
accommodate the number of OS threads in the database server */
static
ibool
log_calc_max_ages(void)
/*===================*/
{
log_group_t* group;
ulint margin;
ulint free;
ibool success = TRUE;
ulint smallest_capacity;
ulint archive_margin;
ulint smallest_archive_margin;
mutex_enter(&(log_sys->mutex));
group = UT_LIST_GET_FIRST(log_sys->log_groups);
ut_ad(group);
smallest_capacity = ULINT_MAX;
smallest_archive_margin = ULINT_MAX;
while (group) {
if (log_group_get_capacity(group) < smallest_capacity) {
smallest_capacity = log_group_get_capacity(group);
}
archive_margin = log_group_get_capacity(group)
- (group->file_size - LOG_FILE_HDR_SIZE)
- LOG_ARCHIVE_EXTRA_MARGIN;
if (archive_margin < smallest_archive_margin) {
smallest_archive_margin = archive_margin;
}
group = UT_LIST_GET_NEXT(log_groups, group);
}
/* Add extra safety */
smallest_capacity = smallest_capacity - smallest_capacity / 10;
/* For each OS thread we must reserve so much free space in the
smallest log group that it can accommodate the log entries produced
by single query steps: running out of free log space is a serious
system error which requires rebooting the database. */
free = LOG_CHECKPOINT_FREE_PER_THREAD * (10 + srv_thread_concurrency)
+ LOG_CHECKPOINT_EXTRA_FREE;
if (free >= smallest_capacity / 2) {
success = FALSE;
goto failure;
} else {
margin = smallest_capacity - free;
}
margin = ut_min(margin, log_sys->adm_checkpoint_interval);
margin = margin - margin / 10; /* Add still some extra safety */
log_sys->log_group_capacity = smallest_capacity;
log_sys->max_modified_age_async = margin
- margin / LOG_POOL_PREFLUSH_RATIO_ASYNC;
log_sys->max_modified_age_sync = margin
- margin / LOG_POOL_PREFLUSH_RATIO_SYNC;
log_sys->max_checkpoint_age_async = margin - margin
/ LOG_POOL_CHECKPOINT_RATIO_ASYNC;
log_sys->max_checkpoint_age = margin;
#ifdef UNIV_LOG_ARCHIVE
log_sys->max_archived_lsn_age = smallest_archive_margin;
log_sys->max_archived_lsn_age_async = smallest_archive_margin
- smallest_archive_margin / LOG_ARCHIVE_RATIO_ASYNC;
#endif /* UNIV_LOG_ARCHIVE */
failure:
mutex_exit(&(log_sys->mutex));
if (!success) {
fprintf(stderr,
"InnoDB: Error: ib_logfiles are too small"
" for innodb_thread_concurrency %lu.\n"
"InnoDB: The combined size of ib_logfiles"
" should be bigger than\n"
"InnoDB: 200 kB * innodb_thread_concurrency.\n"
"InnoDB: To get mysqld to start up, set"
" innodb_thread_concurrency in my.cnf\n"
"InnoDB: to a lower value, for example, to 8."
" After an ERROR-FREE shutdown\n"
"InnoDB: of mysqld you can adjust the size of"
" ib_logfiles, as explained in\n"
"InnoDB: " REFMAN "adding-and-removing.html\n"
"InnoDB: Cannot continue operation."
" Calling exit(1).\n",
(ulong)srv_thread_concurrency);
exit(1);
}
return(success);
}
/******************************************************//**
Initializes the log. */
UNIV_INTERN
void
log_init(void)
/*==========*/
{
log_sys = mem_alloc(sizeof(log_t));
mutex_create(log_sys_mutex_key, &log_sys->mutex, SYNC_LOG);
mutex_enter(&(log_sys->mutex));
/* Start the lsn from one log block from zero: this way every
log record has a start lsn != zero, a fact which we will use */
log_sys->lsn = LOG_START_LSN;
ut_a(LOG_BUFFER_SIZE >= 16 * OS_FILE_LOG_BLOCK_SIZE);
ut_a(LOG_BUFFER_SIZE >= 4 * UNIV_PAGE_SIZE);
log_sys->buf_ptr = mem_alloc(LOG_BUFFER_SIZE + OS_FILE_LOG_BLOCK_SIZE);
log_sys->buf = ut_align(log_sys->buf_ptr, OS_FILE_LOG_BLOCK_SIZE);
log_sys->buf_size = LOG_BUFFER_SIZE;
memset(log_sys->buf, '\0', LOG_BUFFER_SIZE);
log_sys->max_buf_free = log_sys->buf_size / LOG_BUF_FLUSH_RATIO
- LOG_BUF_FLUSH_MARGIN;
log_sys->check_flush_or_checkpoint = TRUE;
UT_LIST_INIT(log_sys->log_groups);
log_sys->n_log_ios = 0;
log_sys->n_log_ios_old = log_sys->n_log_ios;
log_sys->last_printout_time = time(NULL);
/*----------------------------*/
log_sys->buf_next_to_write = 0;
log_sys->write_lsn = 0;
log_sys->current_flush_lsn = 0;
log_sys->flushed_to_disk_lsn = 0;
log_sys->written_to_some_lsn = log_sys->lsn;
log_sys->written_to_all_lsn = log_sys->lsn;
log_sys->n_pending_writes = 0;
log_sys->no_flush_event = os_event_create(NULL);
os_event_set(log_sys->no_flush_event);
log_sys->one_flushed_event = os_event_create(NULL);
os_event_set(log_sys->one_flushed_event);
/*----------------------------*/
log_sys->adm_checkpoint_interval = ULINT_MAX;
log_sys->next_checkpoint_no = 0;
log_sys->last_checkpoint_lsn = log_sys->lsn;
log_sys->n_pending_checkpoint_writes = 0;
rw_lock_create(checkpoint_lock_key, &log_sys->checkpoint_lock,
SYNC_NO_ORDER_CHECK);
log_sys->checkpoint_buf_ptr = mem_alloc(2 * OS_FILE_LOG_BLOCK_SIZE);
log_sys->checkpoint_buf = ut_align(log_sys->checkpoint_buf_ptr,
OS_FILE_LOG_BLOCK_SIZE);
memset(log_sys->checkpoint_buf, '\0', OS_FILE_LOG_BLOCK_SIZE);
/*----------------------------*/
#ifdef UNIV_LOG_ARCHIVE
/* Under MySQL, log archiving is always off */
log_sys->archiving_state = LOG_ARCH_OFF;
log_sys->archived_lsn = log_sys->lsn;
log_sys->next_archived_lsn = 0;
log_sys->n_pending_archive_ios = 0;
rw_lock_create(archive_lock_key, &log_sys->archive_lock,
SYNC_NO_ORDER_CHECK);
log_sys->archive_buf = NULL;
/* ut_align(
ut_malloc(LOG_ARCHIVE_BUF_SIZE
+ OS_FILE_LOG_BLOCK_SIZE),
OS_FILE_LOG_BLOCK_SIZE); */
log_sys->archive_buf_size = 0;
/* memset(log_sys->archive_buf, '\0', LOG_ARCHIVE_BUF_SIZE); */
log_sys->archiving_on = os_event_create(NULL);
#endif /* UNIV_LOG_ARCHIVE */
/*----------------------------*/
log_block_init(log_sys->buf, log_sys->lsn);
log_block_set_first_rec_group(log_sys->buf, LOG_BLOCK_HDR_SIZE);
log_sys->buf_free = LOG_BLOCK_HDR_SIZE;
log_sys->lsn = LOG_START_LSN + LOG_BLOCK_HDR_SIZE;
mutex_exit(&(log_sys->mutex));
#ifdef UNIV_LOG_DEBUG
recv_sys_create();
recv_sys_init(buf_pool_get_curr_size());
recv_sys->parse_start_lsn = log_sys->lsn;
recv_sys->scanned_lsn = log_sys->lsn;
recv_sys->scanned_checkpoint_no = 0;
recv_sys->recovered_lsn = log_sys->lsn;
recv_sys->limit_lsn = IB_ULONGLONG_MAX;
#endif
}
/******************************************************************//**
Inits a log group to the log system. */
UNIV_INTERN
void
log_group_init(
/*===========*/
ulint id, /*!< in: group id */
ulint n_files, /*!< in: number of log files */
ulint file_size, /*!< in: log file size in bytes */
ulint space_id, /*!< in: space id of the file space
which contains the log files of this
group */
ulint archive_space_id __attribute__((unused)))
/*!< in: space id of the file space
which contains some archived log
files for this group; currently, only
for the first log group this is
used */
{
ulint i;
log_group_t* group;
group = mem_alloc(sizeof(log_group_t));
group->id = id;
group->n_files = n_files;
group->file_size = file_size;
group->space_id = space_id;
group->state = LOG_GROUP_OK;
group->lsn = LOG_START_LSN;
group->lsn_offset = LOG_FILE_HDR_SIZE;
group->n_pending_writes = 0;
group->file_header_bufs_ptr = mem_alloc(sizeof(byte*) * n_files);
group->file_header_bufs = mem_alloc(sizeof(byte*) * n_files);
#ifdef UNIV_LOG_ARCHIVE
group->archive_file_header_bufs_ptr = mem_alloc(
sizeof(byte*) * n_files);
group->archive_file_header_bufs = mem_alloc(sizeof(byte*) * n_files);
#endif /* UNIV_LOG_ARCHIVE */
for (i = 0; i < n_files; i++) {
group->file_header_bufs_ptr[i] = mem_alloc(
LOG_FILE_HDR_SIZE + OS_FILE_LOG_BLOCK_SIZE);
group->file_header_bufs[i] = ut_align(
group->file_header_bufs_ptr[i],
OS_FILE_LOG_BLOCK_SIZE);
memset(*(group->file_header_bufs + i), '\0',
LOG_FILE_HDR_SIZE);
#ifdef UNIV_LOG_ARCHIVE
group->archive_file_header_bufs_ptr[i] = mem_alloc(
LOG_FILE_HDR_SIZE + OS_FILE_LOG_BLOCK_SIZE);
group->archive_file_header_bufs[i] = ut_align(
group->archive_file_header_bufs_ptr[i],
OS_FILE_LOG_BLOCK_SIZE);
memset(*(group->archive_file_header_bufs + i), '\0',
LOG_FILE_HDR_SIZE);
#endif /* UNIV_LOG_ARCHIVE */
}
#ifdef UNIV_LOG_ARCHIVE
group->archive_space_id = archive_space_id;
group->archived_file_no = 0;
group->archived_offset = 0;
#endif /* UNIV_LOG_ARCHIVE */
group->checkpoint_buf_ptr = mem_alloc(2 * OS_FILE_LOG_BLOCK_SIZE);
group->checkpoint_buf = ut_align(group->checkpoint_buf_ptr,
OS_FILE_LOG_BLOCK_SIZE);
memset(group->checkpoint_buf, '\0', OS_FILE_LOG_BLOCK_SIZE);
UT_LIST_ADD_LAST(log_groups, log_sys->log_groups, group);
ut_a(log_calc_max_ages());
}
/******************************************************************//**
Does the unlockings needed in flush i/o completion. */
UNIV_INLINE
void
log_flush_do_unlocks(
/*=================*/
ulint code) /*!< in: any ORed combination of LOG_UNLOCK_FLUSH_LOCK
and LOG_UNLOCK_NONE_FLUSHED_LOCK */
{
ut_ad(mutex_own(&(log_sys->mutex)));
/* NOTE that we must own the log mutex when doing the setting of the
events: this is because transactions will wait for these events to
be set, and at that moment the log flush they were waiting for must
have ended. If the log mutex were not reserved here, the i/o-thread
calling this function might be preempted for a while, and when it
resumed execution, it might be that a new flush had been started, and
this function would erroneously signal the NEW flush as completed.
Thus, the changes in the state of these events are performed
atomically in conjunction with the changes in the state of
log_sys->n_pending_writes etc. */
if (code & LOG_UNLOCK_NONE_FLUSHED_LOCK) {
os_event_set(log_sys->one_flushed_event);
}
if (code & LOG_UNLOCK_FLUSH_LOCK) {
os_event_set(log_sys->no_flush_event);
}
}
/******************************************************************//**
Checks if a flush is completed for a log group and does the completion
routine if yes.
@return LOG_UNLOCK_NONE_FLUSHED_LOCK or 0 */
UNIV_INLINE
ulint
log_group_check_flush_completion(
/*=============================*/
log_group_t* group) /*!< in: log group */
{
ut_ad(mutex_own(&(log_sys->mutex)));
if (!log_sys->one_flushed && group->n_pending_writes == 0) {
#ifdef UNIV_DEBUG
if (log_debug_writes) {
fprintf(stderr,
"Log flushed first to group %lu\n",
(ulong) group->id);
}
#endif /* UNIV_DEBUG */
log_sys->written_to_some_lsn = log_sys->write_lsn;
log_sys->one_flushed = TRUE;
return(LOG_UNLOCK_NONE_FLUSHED_LOCK);
}
#ifdef UNIV_DEBUG
if (log_debug_writes && (group->n_pending_writes == 0)) {
fprintf(stderr, "Log flushed to group %lu\n",
(ulong) group->id);
}
#endif /* UNIV_DEBUG */
return(0);
}
/******************************************************//**
Checks if a flush is completed and does the completion routine if yes.
@return LOG_UNLOCK_FLUSH_LOCK or 0 */
static
ulint
log_sys_check_flush_completion(void)
/*================================*/
{
ulint move_start;
ulint move_end;
ut_ad(mutex_own(&(log_sys->mutex)));
if (log_sys->n_pending_writes == 0) {
log_sys->written_to_all_lsn = log_sys->write_lsn;
log_sys->buf_next_to_write = log_sys->write_end_offset;
if (log_sys->write_end_offset > log_sys->max_buf_free / 2) {
/* Move the log buffer content to the start of the
buffer */
move_start = ut_calc_align_down(
log_sys->write_end_offset,
OS_FILE_LOG_BLOCK_SIZE);
move_end = ut_calc_align(log_sys->buf_free,
OS_FILE_LOG_BLOCK_SIZE);
ut_memmove(log_sys->buf, log_sys->buf + move_start,
move_end - move_start);
log_sys->buf_free -= move_start;
log_sys->buf_next_to_write -= move_start;
}
return(LOG_UNLOCK_FLUSH_LOCK);
}
return(0);
}
/******************************************************//**
Completes an i/o to a log file. */
UNIV_INTERN
void
log_io_complete(
/*============*/
log_group_t* group) /*!< in: log group or a dummy pointer */
{
ulint unlock;
#ifdef UNIV_LOG_ARCHIVE
if ((byte*)group == &log_archive_io) {
/* It was an archive write */
log_io_complete_archive();
return;
}
#endif /* UNIV_LOG_ARCHIVE */
if ((ulint)group & 0x1UL) {
/* It was a checkpoint write */
group = (log_group_t*)((ulint)group - 1);
if (srv_unix_file_flush_method != SRV_UNIX_O_DSYNC
&& srv_unix_file_flush_method != SRV_UNIX_NOSYNC) {
fil_flush(group->space_id);
}
#ifdef UNIV_DEBUG
if (log_debug_writes) {
fprintf(stderr,
"Checkpoint info written to group %lu\n",
group->id);
}
#endif /* UNIV_DEBUG */
log_io_complete_checkpoint();
return;
}
ut_error; /*!< We currently use synchronous writing of the
logs and cannot end up here! */
if (srv_unix_file_flush_method != SRV_UNIX_O_DSYNC
&& srv_unix_file_flush_method != SRV_UNIX_NOSYNC
&& srv_flush_log_at_trx_commit != 2) {
fil_flush(group->space_id);
}
mutex_enter(&(log_sys->mutex));
ut_ad(!recv_no_log_write);
ut_a(group->n_pending_writes > 0);
ut_a(log_sys->n_pending_writes > 0);
group->n_pending_writes--;
log_sys->n_pending_writes--;
unlock = log_group_check_flush_completion(group);
unlock = unlock | log_sys_check_flush_completion();
log_flush_do_unlocks(unlock);
mutex_exit(&(log_sys->mutex));
}
/******************************************************//**
Writes a log file header to a log file space. */
static
void
log_group_file_header_flush(
/*========================*/
log_group_t* group, /*!< in: log group */
ulint nth_file, /*!< in: header to the nth file in the
log file space */
ib_uint64_t start_lsn) /*!< in: log file data starts at this
lsn */
{
byte* buf;
ulint dest_offset;
ut_ad(mutex_own(&(log_sys->mutex)));
ut_ad(!recv_no_log_write);
ut_a(nth_file < group->n_files);
buf = *(group->file_header_bufs + nth_file);
mach_write_to_4(buf + LOG_GROUP_ID, group->id);
mach_write_ull(buf + LOG_FILE_START_LSN, start_lsn);
/* Wipe over possible label of ibbackup --restore */
memcpy(buf + LOG_FILE_WAS_CREATED_BY_HOT_BACKUP, " ", 4);
dest_offset = nth_file * group->file_size;
#ifdef UNIV_DEBUG
if (log_debug_writes) {
fprintf(stderr,
"Writing log file header to group %lu file %lu\n",
(ulong) group->id, (ulong) nth_file);
}
#endif /* UNIV_DEBUG */
if (log_do_write) {
log_sys->n_log_ios++;
srv_os_log_pending_writes++;
fil_io(OS_FILE_WRITE | OS_FILE_LOG, TRUE, group->space_id, 0,
dest_offset / UNIV_PAGE_SIZE,
dest_offset % UNIV_PAGE_SIZE,
OS_FILE_LOG_BLOCK_SIZE,
buf, group);
srv_os_log_pending_writes--;
}
}
/******************************************************//**
Stores a 4-byte checksum to the trailer checksum field of a log block
before writing it to a log file. This checksum is used in recovery to
check the consistency of a log block. */
static
void
log_block_store_checksum(
/*=====================*/
byte* block) /*!< in/out: pointer to a log block */
{
log_block_set_checksum(block, log_block_calc_checksum(block));
}
/******************************************************//**
Writes a buffer to a log file group. */
UNIV_INTERN
void
log_group_write_buf(
/*================*/
log_group_t* group, /*!< in: log group */
byte* buf, /*!< in: buffer */
ulint len, /*!< in: buffer len; must be divisible
by OS_FILE_LOG_BLOCK_SIZE */
ib_uint64_t start_lsn, /*!< in: start lsn of the buffer; must
be divisible by
OS_FILE_LOG_BLOCK_SIZE */
ulint new_data_offset)/*!< in: start offset of new data in
buf: this parameter is used to decide
if we have to write a new log file
header */
{
ulint write_len;
ibool write_header;
ulint next_offset;
ulint i;
ut_ad(mutex_own(&(log_sys->mutex)));
ut_ad(!recv_no_log_write);
ut_a(len % OS_FILE_LOG_BLOCK_SIZE == 0);
ut_a(((ulint) start_lsn) % OS_FILE_LOG_BLOCK_SIZE == 0);
if (new_data_offset == 0) {
write_header = TRUE;
} else {
write_header = FALSE;
}
loop:
if (len == 0) {
return;
}
next_offset = log_group_calc_lsn_offset(start_lsn, group);
if ((next_offset % group->file_size == LOG_FILE_HDR_SIZE)
&& write_header) {
/* We start to write a new log file instance in the group */
log_group_file_header_flush(group,
next_offset / group->file_size,
start_lsn);
srv_os_log_written+= OS_FILE_LOG_BLOCK_SIZE;
srv_log_writes++;
}
if ((next_offset % group->file_size) + len > group->file_size) {
write_len = group->file_size
- (next_offset % group->file_size);
} else {
write_len = len;
}
#ifdef UNIV_DEBUG
if (log_debug_writes) {
fprintf(stderr,
"Writing log file segment to group %lu"
" offset %lu len %lu\n"
"start lsn %llu\n"
"First block n:o %lu last block n:o %lu\n",
(ulong) group->id, (ulong) next_offset,
(ulong) write_len,
start_lsn,
(ulong) log_block_get_hdr_no(buf),
(ulong) log_block_get_hdr_no(
buf + write_len - OS_FILE_LOG_BLOCK_SIZE));
ut_a(log_block_get_hdr_no(buf)
== log_block_convert_lsn_to_no(start_lsn));
for (i = 0; i < write_len / OS_FILE_LOG_BLOCK_SIZE; i++) {
ut_a(log_block_get_hdr_no(buf) + i
== log_block_get_hdr_no(
buf + i * OS_FILE_LOG_BLOCK_SIZE));
}
}
#endif /* UNIV_DEBUG */
/* Calculate the checksums for each log block and write them to
the trailer fields of the log blocks */
for (i = 0; i < write_len / OS_FILE_LOG_BLOCK_SIZE; i++) {
log_block_store_checksum(buf + i * OS_FILE_LOG_BLOCK_SIZE);
}
if (log_do_write) {
log_sys->n_log_ios++;
srv_os_log_pending_writes++;
fil_io(OS_FILE_WRITE | OS_FILE_LOG, TRUE, group->space_id, 0,
next_offset / UNIV_PAGE_SIZE,
next_offset % UNIV_PAGE_SIZE, write_len, buf, group);
srv_os_log_pending_writes--;
srv_os_log_written+= write_len;
srv_log_writes++;
}
if (write_len < len) {
start_lsn += write_len;
len -= write_len;
buf += write_len;
write_header = TRUE;
goto loop;
}
}
/******************************************************//**
This function is called, e.g., when a transaction wants to commit. It checks
that the log has been written to the log file up to the last log entry written
by the transaction. If there is a flush running, it waits and checks if the
flush flushed enough. If not, starts a new flush. */
UNIV_INTERN
void
log_write_up_to(
/*============*/
ib_uint64_t lsn, /*!< in: log sequence number up to which
the log should be written,
IB_ULONGLONG_MAX if not specified */
ulint wait, /*!< in: LOG_NO_WAIT, LOG_WAIT_ONE_GROUP,
or LOG_WAIT_ALL_GROUPS */
ibool flush_to_disk)
/*!< in: TRUE if we want the written log
also to be flushed to disk */
{
log_group_t* group;
ulint start_offset;
ulint end_offset;
ulint area_start;
ulint area_end;
#ifdef UNIV_DEBUG
ulint loop_count = 0;
#endif /* UNIV_DEBUG */
ulint unlock;
if (recv_no_ibuf_operations) {
/* Recovery is running and no operations on the log files are
allowed yet (the variable name .._no_ibuf_.. is misleading) */
return;
}
loop:
#ifdef UNIV_DEBUG
loop_count++;
ut_ad(loop_count < 5);
# if 0
if (loop_count > 2) {
fprintf(stderr, "Log loop count %lu\n", loop_count);
}
# endif
#endif
mutex_enter(&(log_sys->mutex));
ut_ad(!recv_no_log_write);
if (flush_to_disk
&& log_sys->flushed_to_disk_lsn >= lsn) {
mutex_exit(&(log_sys->mutex));
return;
}
if (!flush_to_disk
&& (log_sys->written_to_all_lsn >= lsn
|| (log_sys->written_to_some_lsn >= lsn
&& wait != LOG_WAIT_ALL_GROUPS))) {
mutex_exit(&(log_sys->mutex));
return;
}
if (log_sys->n_pending_writes > 0) {
/* A write (+ possibly flush to disk) is running */
if (flush_to_disk
&& log_sys->current_flush_lsn >= lsn) {
/* The write + flush will write enough: wait for it to
complete */
goto do_waits;
}
if (!flush_to_disk
&& log_sys->write_lsn >= lsn) {
/* The write will write enough: wait for it to
complete */
goto do_waits;
}
mutex_exit(&(log_sys->mutex));
/* Wait for the write to complete and try to start a new
write */
os_event_wait(log_sys->no_flush_event);
goto loop;
}
if (!flush_to_disk
&& log_sys->buf_free == log_sys->buf_next_to_write) {
/* Nothing to write and no flush to disk requested */
mutex_exit(&(log_sys->mutex));
return;
}
#ifdef UNIV_DEBUG
if (log_debug_writes) {
fprintf(stderr,
"Writing log from %llu up to lsn %llu\n",
log_sys->written_to_all_lsn,
log_sys->lsn);
}
#endif /* UNIV_DEBUG */
log_sys->n_pending_writes++;
group = UT_LIST_GET_FIRST(log_sys->log_groups);
group->n_pending_writes++; /*!< We assume here that we have only
one log group! */
os_event_reset(log_sys->no_flush_event);
os_event_reset(log_sys->one_flushed_event);
start_offset = log_sys->buf_next_to_write;
end_offset = log_sys->buf_free;
area_start = ut_calc_align_down(start_offset, OS_FILE_LOG_BLOCK_SIZE);
area_end = ut_calc_align(end_offset, OS_FILE_LOG_BLOCK_SIZE);
ut_ad(area_end - area_start > 0);
log_sys->write_lsn = log_sys->lsn;
if (flush_to_disk) {
log_sys->current_flush_lsn = log_sys->lsn;
}
log_sys->one_flushed = FALSE;
log_block_set_flush_bit(log_sys->buf + area_start, TRUE);
log_block_set_checkpoint_no(
log_sys->buf + area_end - OS_FILE_LOG_BLOCK_SIZE,
log_sys->next_checkpoint_no);
/* Copy the last, incompletely written, log block a log block length
up, so that when the flush operation writes from the log buffer, the
segment to write will not be changed by writers to the log */
ut_memcpy(log_sys->buf + area_end,
log_sys->buf + area_end - OS_FILE_LOG_BLOCK_SIZE,
OS_FILE_LOG_BLOCK_SIZE);
log_sys->buf_free += OS_FILE_LOG_BLOCK_SIZE;
log_sys->write_end_offset = log_sys->buf_free;
group = UT_LIST_GET_FIRST(log_sys->log_groups);
/* Do the write to the log files */
while (group) {
log_group_write_buf(
group, log_sys->buf + area_start,
area_end - area_start,
ut_uint64_align_down(log_sys->written_to_all_lsn,
OS_FILE_LOG_BLOCK_SIZE),
start_offset - area_start);
log_group_set_fields(group, log_sys->write_lsn);
group = UT_LIST_GET_NEXT(log_groups, group);
}
mutex_exit(&(log_sys->mutex));
if (srv_unix_file_flush_method == SRV_UNIX_O_DSYNC) {
/* O_DSYNC means the OS did not buffer the log file at all:
so we have also flushed to disk what we have written */
log_sys->flushed_to_disk_lsn = log_sys->write_lsn;
} else if (flush_to_disk) {
group = UT_LIST_GET_FIRST(log_sys->log_groups);
fil_flush(group->space_id);
log_sys->flushed_to_disk_lsn = log_sys->write_lsn;
}
mutex_enter(&(log_sys->mutex));
group = UT_LIST_GET_FIRST(log_sys->log_groups);
ut_a(group->n_pending_writes == 1);
ut_a(log_sys->n_pending_writes == 1);
group->n_pending_writes--;
log_sys->n_pending_writes--;
unlock = log_group_check_flush_completion(group);
unlock = unlock | log_sys_check_flush_completion();
log_flush_do_unlocks(unlock);
mutex_exit(&(log_sys->mutex));
return;
do_waits:
mutex_exit(&(log_sys->mutex));
switch (wait) {
case LOG_WAIT_ONE_GROUP:
os_event_wait(log_sys->one_flushed_event);
break;
case LOG_WAIT_ALL_GROUPS:
os_event_wait(log_sys->no_flush_event);
break;
#ifdef UNIV_DEBUG
case LOG_NO_WAIT:
break;
default:
ut_error;
#endif /* UNIV_DEBUG */
}
}
/****************************************************************//**
Does a syncronous flush of the log buffer to disk. */
UNIV_INTERN
void
log_buffer_flush_to_disk(void)
/*==========================*/
{
ib_uint64_t lsn;
mutex_enter(&(log_sys->mutex));
lsn = log_sys->lsn;
mutex_exit(&(log_sys->mutex));
log_write_up_to(lsn, LOG_WAIT_ALL_GROUPS, TRUE);
}
/****************************************************************//**
This functions writes the log buffer to the log file and if 'flush'
is set it forces a flush of the log file as well. This is meant to be
called from background master thread only as it does not wait for
the write (+ possible flush) to finish. */
UNIV_INTERN
void
log_buffer_sync_in_background(
/*==========================*/
ibool flush) /*!< in: flush the logs to disk */
{
ib_uint64_t lsn;
mutex_enter(&(log_sys->mutex));
lsn = log_sys->lsn;
mutex_exit(&(log_sys->mutex));
log_write_up_to(lsn, LOG_NO_WAIT, flush);
}
/********************************************************************
Tries to establish a big enough margin of free space in the log buffer, such
that a new log entry can be catenated without an immediate need for a flush. */
static
void
log_flush_margin(void)
/*==================*/
{
log_t* log = log_sys;
ib_uint64_t lsn = 0;
mutex_enter(&(log->mutex));
if (log->buf_free > log->max_buf_free) {
if (log->n_pending_writes > 0) {
/* A flush is running: hope that it will provide enough
free space */
} else {
lsn = log->lsn;
}
}
mutex_exit(&(log->mutex));
if (lsn) {
log_write_up_to(lsn, LOG_NO_WAIT, FALSE);
}
}
/****************************************************************//**
Advances the smallest lsn for which there are unflushed dirty blocks in the
buffer pool. NOTE: this function may only be called if the calling thread owns
no synchronization objects!
@return FALSE if there was a flush batch of the same type running,
which means that we could not start this flush batch */
UNIV_INTERN
ibool
log_preflush_pool_modified_pages(
/*=============================*/
ib_uint64_t new_oldest, /*!< in: try to advance
oldest_modified_lsn at least
to this lsn */
ibool sync) /*!< in: TRUE if synchronous
operation is desired */
{
ulint n_pages;
if (recv_recovery_on) {
/* If the recovery is running, we must first apply all
log records to their respective file pages to get the
right modify lsn values to these pages: otherwise, there
might be pages on disk which are not yet recovered to the
current lsn, and even after calling this function, we could
not know how up-to-date the disk version of the database is,
and we could not make a new checkpoint on the basis of the
info on the buffer pool only. */
recv_apply_hashed_log_recs(TRUE);
}
n_pages = buf_flush_batch(BUF_FLUSH_LIST, ULINT_MAX, new_oldest);
if (sync) {
buf_flush_wait_batch_end(BUF_FLUSH_LIST);
}
if (n_pages == ULINT_UNDEFINED) {
return(FALSE);
}
return(TRUE);
}
/******************************************************//**
Completes a checkpoint. */
static
void
log_complete_checkpoint(void)
/*=========================*/
{
ut_ad(mutex_own(&(log_sys->mutex)));
ut_ad(log_sys->n_pending_checkpoint_writes == 0);
log_sys->next_checkpoint_no++;
log_sys->last_checkpoint_lsn = log_sys->next_checkpoint_lsn;
rw_lock_x_unlock_gen(&(log_sys->checkpoint_lock), LOG_CHECKPOINT);
}
/******************************************************//**
Completes an asynchronous checkpoint info write i/o to a log file. */
static
void
log_io_complete_checkpoint(void)
/*============================*/
{
mutex_enter(&(log_sys->mutex));
ut_ad(log_sys->n_pending_checkpoint_writes > 0);
log_sys->n_pending_checkpoint_writes--;
if (log_sys->n_pending_checkpoint_writes == 0) {
log_complete_checkpoint();
}
mutex_exit(&(log_sys->mutex));
}
/*******************************************************************//**
Writes info to a checkpoint about a log group. */
static
void
log_checkpoint_set_nth_group_info(
/*==============================*/
byte* buf, /*!< in: buffer for checkpoint info */
ulint n, /*!< in: nth slot */
ulint file_no,/*!< in: archived file number */
ulint offset) /*!< in: archived file offset */
{
ut_ad(n < LOG_MAX_N_GROUPS);
mach_write_to_4(buf + LOG_CHECKPOINT_GROUP_ARRAY
+ 8 * n + LOG_CHECKPOINT_ARCHIVED_FILE_NO, file_no);
mach_write_to_4(buf + LOG_CHECKPOINT_GROUP_ARRAY
+ 8 * n + LOG_CHECKPOINT_ARCHIVED_OFFSET, offset);
}
/*******************************************************************//**
Gets info from a checkpoint about a log group. */
UNIV_INTERN
void
log_checkpoint_get_nth_group_info(
/*==============================*/
const byte* buf, /*!< in: buffer containing checkpoint info */
ulint n, /*!< in: nth slot */
ulint* file_no,/*!< out: archived file number */
ulint* offset) /*!< out: archived file offset */
{
ut_ad(n < LOG_MAX_N_GROUPS);
*file_no = mach_read_from_4(buf + LOG_CHECKPOINT_GROUP_ARRAY
+ 8 * n + LOG_CHECKPOINT_ARCHIVED_FILE_NO);
*offset = mach_read_from_4(buf + LOG_CHECKPOINT_GROUP_ARRAY
+ 8 * n + LOG_CHECKPOINT_ARCHIVED_OFFSET);
}
/******************************************************//**
Writes the checkpoint info to a log group header. */
static
void
log_group_checkpoint(
/*=================*/
log_group_t* group) /*!< in: log group */
{
log_group_t* group2;
#ifdef UNIV_LOG_ARCHIVE
ib_uint64_t archived_lsn;
ib_uint64_t next_archived_lsn;
#endif /* UNIV_LOG_ARCHIVE */
ulint write_offset;
ulint fold;
byte* buf;
ulint i;
ut_ad(mutex_own(&(log_sys->mutex)));
#if LOG_CHECKPOINT_SIZE > OS_FILE_LOG_BLOCK_SIZE
# error "LOG_CHECKPOINT_SIZE > OS_FILE_LOG_BLOCK_SIZE"
#endif
buf = group->checkpoint_buf;
mach_write_ull(buf + LOG_CHECKPOINT_NO, log_sys->next_checkpoint_no);
mach_write_ull(buf + LOG_CHECKPOINT_LSN, log_sys->next_checkpoint_lsn);
mach_write_to_4(buf + LOG_CHECKPOINT_OFFSET,
log_group_calc_lsn_offset(
log_sys->next_checkpoint_lsn, group));
mach_write_to_4(buf + LOG_CHECKPOINT_LOG_BUF_SIZE, log_sys->buf_size);
#ifdef UNIV_LOG_ARCHIVE
if (log_sys->archiving_state == LOG_ARCH_OFF) {
archived_lsn = IB_ULONGLONG_MAX;
} else {
archived_lsn = log_sys->archived_lsn;
if (archived_lsn != log_sys->next_archived_lsn) {
next_archived_lsn = log_sys->next_archived_lsn;
/* For debugging only */
}
}
mach_write_ull(buf + LOG_CHECKPOINT_ARCHIVED_LSN, archived_lsn);
#else /* UNIV_LOG_ARCHIVE */
mach_write_ull(buf + LOG_CHECKPOINT_ARCHIVED_LSN, IB_ULONGLONG_MAX);
#endif /* UNIV_LOG_ARCHIVE */
for (i = 0; i < LOG_MAX_N_GROUPS; i++) {
log_checkpoint_set_nth_group_info(buf, i, 0, 0);
}
group2 = UT_LIST_GET_FIRST(log_sys->log_groups);
while (group2) {
log_checkpoint_set_nth_group_info(buf, group2->id,
#ifdef UNIV_LOG_ARCHIVE
group2->archived_file_no,
group2->archived_offset
#else /* UNIV_LOG_ARCHIVE */
0, 0
#endif /* UNIV_LOG_ARCHIVE */
);
group2 = UT_LIST_GET_NEXT(log_groups, group2);
}
fold = ut_fold_binary(buf, LOG_CHECKPOINT_CHECKSUM_1);
mach_write_to_4(buf + LOG_CHECKPOINT_CHECKSUM_1, fold);
fold = ut_fold_binary(buf + LOG_CHECKPOINT_LSN,
LOG_CHECKPOINT_CHECKSUM_2 - LOG_CHECKPOINT_LSN);
mach_write_to_4(buf + LOG_CHECKPOINT_CHECKSUM_2, fold);
/* Starting from InnoDB-3.23.50, we also write info on allocated
size in the tablespace */
mach_write_to_4(buf + LOG_CHECKPOINT_FSP_FREE_LIMIT,
log_fsp_current_free_limit);
mach_write_to_4(buf + LOG_CHECKPOINT_FSP_MAGIC_N,
LOG_CHECKPOINT_FSP_MAGIC_N_VAL);
/* We alternate the physical place of the checkpoint info in the first
log file */
if ((log_sys->next_checkpoint_no & 1) == 0) {
write_offset = LOG_CHECKPOINT_1;
} else {
write_offset = LOG_CHECKPOINT_2;
}
if (log_do_write) {
if (log_sys->n_pending_checkpoint_writes == 0) {
rw_lock_x_lock_gen(&(log_sys->checkpoint_lock),
LOG_CHECKPOINT);
}
log_sys->n_pending_checkpoint_writes++;
log_sys->n_log_ios++;
/* We send as the last parameter the group machine address
added with 1, as we want to distinguish between a normal log
file write and a checkpoint field write */
fil_io(OS_FILE_WRITE | OS_FILE_LOG, FALSE, group->space_id, 0,
write_offset / UNIV_PAGE_SIZE,
write_offset % UNIV_PAGE_SIZE,
OS_FILE_LOG_BLOCK_SIZE,
buf, ((byte*)group + 1));
ut_ad(((ulint)group & 0x1UL) == 0);
}
}
#endif /* !UNIV_HOTBACKUP */
#ifdef UNIV_HOTBACKUP
/******************************************************//**
Writes info to a buffer of a log group when log files are created in
backup restoration. */
UNIV_INTERN
void
log_reset_first_header_and_checkpoint(
/*==================================*/
byte* hdr_buf,/*!< in: buffer which will be written to the
start of the first log file */
ib_uint64_t start) /*!< in: lsn of the start of the first log file;
we pretend that there is a checkpoint at
start + LOG_BLOCK_HDR_SIZE */
{
ulint fold;
byte* buf;
ib_uint64_t lsn;
mach_write_to_4(hdr_buf + LOG_GROUP_ID, 0);
mach_write_ull(hdr_buf + LOG_FILE_START_LSN, start);
lsn = start + LOG_BLOCK_HDR_SIZE;
/* Write the label of ibbackup --restore */
strcpy((char*) hdr_buf + LOG_FILE_WAS_CREATED_BY_HOT_BACKUP,
"ibbackup ");
ut_sprintf_timestamp((char*) hdr_buf
+ (LOG_FILE_WAS_CREATED_BY_HOT_BACKUP
+ (sizeof "ibbackup ") - 1));
buf = hdr_buf + LOG_CHECKPOINT_1;
mach_write_ull(buf + LOG_CHECKPOINT_NO, 0);
mach_write_ull(buf + LOG_CHECKPOINT_LSN, lsn);
mach_write_to_4(buf + LOG_CHECKPOINT_OFFSET,
LOG_FILE_HDR_SIZE + LOG_BLOCK_HDR_SIZE);
mach_write_to_4(buf + LOG_CHECKPOINT_LOG_BUF_SIZE, 2 * 1024 * 1024);
mach_write_ull(buf + LOG_CHECKPOINT_ARCHIVED_LSN, IB_ULONGLONG_MAX);
fold = ut_fold_binary(buf, LOG_CHECKPOINT_CHECKSUM_1);
mach_write_to_4(buf + LOG_CHECKPOINT_CHECKSUM_1, fold);
fold = ut_fold_binary(buf + LOG_CHECKPOINT_LSN,
LOG_CHECKPOINT_CHECKSUM_2 - LOG_CHECKPOINT_LSN);
mach_write_to_4(buf + LOG_CHECKPOINT_CHECKSUM_2, fold);
/* Starting from InnoDB-3.23.50, we should also write info on
allocated size in the tablespace, but unfortunately we do not
know it here */
}
#endif /* UNIV_HOTBACKUP */
#ifndef UNIV_HOTBACKUP
/******************************************************//**
Reads a checkpoint info from a log group header to log_sys->checkpoint_buf. */
UNIV_INTERN
void
log_group_read_checkpoint_info(
/*===========================*/
log_group_t* group, /*!< in: log group */
ulint field) /*!< in: LOG_CHECKPOINT_1 or LOG_CHECKPOINT_2 */
{
ut_ad(mutex_own(&(log_sys->mutex)));
log_sys->n_log_ios++;
fil_io(OS_FILE_READ | OS_FILE_LOG, TRUE, group->space_id, 0,
field / UNIV_PAGE_SIZE, field % UNIV_PAGE_SIZE,
OS_FILE_LOG_BLOCK_SIZE, log_sys->checkpoint_buf, NULL);
}
/******************************************************//**
Writes checkpoint info to groups. */
UNIV_INTERN
void
log_groups_write_checkpoint_info(void)
/*==================================*/
{
log_group_t* group;
ut_ad(mutex_own(&(log_sys->mutex)));
group = UT_LIST_GET_FIRST(log_sys->log_groups);
while (group) {
log_group_checkpoint(group);
group = UT_LIST_GET_NEXT(log_groups, group);
}
}
/******************************************************//**
Makes a checkpoint. Note that this function does not flush dirty
blocks from the buffer pool: it only checks what is lsn of the oldest
modification in the pool, and writes information about the lsn in
log files. Use log_make_checkpoint_at to flush also the pool.
@return TRUE if success, FALSE if a checkpoint write was already running */
UNIV_INTERN
ibool
log_checkpoint(
/*===========*/
ibool sync, /*!< in: TRUE if synchronous operation is
desired */
ibool write_always) /*!< in: the function normally checks if the
the new checkpoint would have a greater
lsn than the previous one: if not, then no
physical write is done; by setting this
parameter TRUE, a physical write will always be
made to log files */
{
ib_uint64_t oldest_lsn;
if (recv_recovery_is_on()) {
recv_apply_hashed_log_recs(TRUE);
}
if (srv_unix_file_flush_method != SRV_UNIX_NOSYNC) {
fil_flush_file_spaces(FIL_TABLESPACE);
}
mutex_enter(&(log_sys->mutex));
ut_ad(!recv_no_log_write);
oldest_lsn = log_buf_pool_get_oldest_modification();
mutex_exit(&(log_sys->mutex));
/* Because log also contains headers and dummy log records,
if the buffer pool contains no dirty buffers, oldest_lsn
gets the value log_sys->lsn from the previous function,
and we must make sure that the log is flushed up to that
lsn. If there are dirty buffers in the buffer pool, then our
write-ahead-logging algorithm ensures that the log has been flushed
up to oldest_lsn. */
log_write_up_to(oldest_lsn, LOG_WAIT_ALL_GROUPS, TRUE);
mutex_enter(&(log_sys->mutex));
if (!write_always
&& log_sys->last_checkpoint_lsn >= oldest_lsn) {
mutex_exit(&(log_sys->mutex));
return(TRUE);
}
ut_ad(log_sys->flushed_to_disk_lsn >= oldest_lsn);
if (log_sys->n_pending_checkpoint_writes > 0) {
/* A checkpoint write is running */
mutex_exit(&(log_sys->mutex));
if (sync) {
/* Wait for the checkpoint write to complete */
rw_lock_s_lock(&(log_sys->checkpoint_lock));
rw_lock_s_unlock(&(log_sys->checkpoint_lock));
}
return(FALSE);
}
log_sys->next_checkpoint_lsn = oldest_lsn;
#ifdef UNIV_DEBUG
if (log_debug_writes) {
fprintf(stderr, "Making checkpoint no %lu at lsn %llu\n",
(ulong) log_sys->next_checkpoint_no,
oldest_lsn);
}
#endif /* UNIV_DEBUG */
log_groups_write_checkpoint_info();
mutex_exit(&(log_sys->mutex));
if (sync) {
/* Wait for the checkpoint write to complete */
rw_lock_s_lock(&(log_sys->checkpoint_lock));
rw_lock_s_unlock(&(log_sys->checkpoint_lock));
}
return(TRUE);
}
/****************************************************************//**
Makes a checkpoint at a given lsn or later. */
UNIV_INTERN
void
log_make_checkpoint_at(
/*===================*/
ib_uint64_t lsn, /*!< in: make a checkpoint at this or a
later lsn, if IB_ULONGLONG_MAX, makes
a checkpoint at the latest lsn */
ibool write_always) /*!< in: the function normally checks if
the new checkpoint would have a
greater lsn than the previous one: if
not, then no physical write is done;
by setting this parameter TRUE, a
physical write will always be made to
log files */
{
/* Preflush pages synchronously */
while (!log_preflush_pool_modified_pages(lsn, TRUE));
while (!log_checkpoint(TRUE, write_always));
}
/****************************************************************//**
Tries to establish a big enough margin of free space in the log groups, such
that a new log entry can be catenated without an immediate need for a
checkpoint. NOTE: this function may only be called if the calling thread
owns no synchronization objects! */
static
void
log_checkpoint_margin(void)
/*=======================*/
{
log_t* log = log_sys;
ib_uint64_t age;
ib_uint64_t checkpoint_age;
ib_uint64_t advance;
ib_uint64_t oldest_lsn;
ibool sync;
ibool checkpoint_sync;
ibool do_checkpoint;
ibool success;
loop:
sync = FALSE;
checkpoint_sync = FALSE;
do_checkpoint = FALSE;
mutex_enter(&(log->mutex));
ut_ad(!recv_no_log_write);
if (log->check_flush_or_checkpoint == FALSE) {
mutex_exit(&(log->mutex));
return;
}
oldest_lsn = log_buf_pool_get_oldest_modification();
age = log->lsn - oldest_lsn;
if (age > log->max_modified_age_sync) {
/* A flush is urgent: we have to do a synchronous preflush */
sync = TRUE;
advance = 2 * (age - log->max_modified_age_sync);
} else if (age > log->max_modified_age_async) {
/* A flush is not urgent: we do an asynchronous preflush */
advance = age - log->max_modified_age_async;
} else {
advance = 0;
}
checkpoint_age = log->lsn - log->last_checkpoint_lsn;
if (checkpoint_age > log->max_checkpoint_age) {
/* A checkpoint is urgent: we do it synchronously */
checkpoint_sync = TRUE;
do_checkpoint = TRUE;
} else if (checkpoint_age > log->max_checkpoint_age_async) {
/* A checkpoint is not urgent: do it asynchronously */
do_checkpoint = TRUE;
log->check_flush_or_checkpoint = FALSE;
} else {
log->check_flush_or_checkpoint = FALSE;
}
mutex_exit(&(log->mutex));
if (advance) {
ib_uint64_t new_oldest = oldest_lsn + advance;
success = log_preflush_pool_modified_pages(new_oldest, sync);
/* If the flush succeeded, this thread has done its part
and can proceed. If it did not succeed, there was another
thread doing a flush at the same time. If sync was FALSE,
the flush was not urgent, and we let this thread proceed.
Otherwise, we let it start from the beginning again. */
if (sync && !success) {
mutex_enter(&(log->mutex));
log->check_flush_or_checkpoint = TRUE;
mutex_exit(&(log->mutex));
goto loop;
}
}
if (do_checkpoint) {
log_checkpoint(checkpoint_sync, FALSE);
if (checkpoint_sync) {
goto loop;
}
}
}
/******************************************************//**
Reads a specified log segment to a buffer. */
UNIV_INTERN
void
log_group_read_log_seg(
/*===================*/
ulint type, /*!< in: LOG_ARCHIVE or LOG_RECOVER */
byte* buf, /*!< in: buffer where to read */
log_group_t* group, /*!< in: log group */
ib_uint64_t start_lsn, /*!< in: read area start */
ib_uint64_t end_lsn) /*!< in: read area end */
{
ulint len;
ulint source_offset;
ibool sync;
ut_ad(mutex_own(&(log_sys->mutex)));
sync = (type == LOG_RECOVER);
loop:
source_offset = log_group_calc_lsn_offset(start_lsn, group);
len = (ulint) (end_lsn - start_lsn);
ut_ad(len != 0);
if ((source_offset % group->file_size) + len > group->file_size) {
len = group->file_size - (source_offset % group->file_size);
}
#ifdef UNIV_LOG_ARCHIVE
if (type == LOG_ARCHIVE) {
log_sys->n_pending_archive_ios++;
}
#endif /* UNIV_LOG_ARCHIVE */
log_sys->n_log_ios++;
fil_io(OS_FILE_READ | OS_FILE_LOG, sync, group->space_id, 0,
source_offset / UNIV_PAGE_SIZE, source_offset % UNIV_PAGE_SIZE,
len, buf, NULL);
start_lsn += len;
buf += len;
if (start_lsn != end_lsn) {
goto loop;
}
}
#ifdef UNIV_LOG_ARCHIVE
/******************************************************//**
Generates an archived log file name. */
UNIV_INTERN
void
log_archived_file_name_gen(
/*=======================*/
char* buf, /*!< in: buffer where to write */
ulint id __attribute__((unused)),
/*!< in: group id;
currently we only archive the first group */
ulint file_no)/*!< in: file number */
{
sprintf(buf, "%sib_arch_log_%010lu", srv_arch_dir, (ulong) file_no);
}
/******************************************************//**
Writes a log file header to a log file space. */
static
void
log_group_archive_file_header_write(
/*================================*/
log_group_t* group, /*!< in: log group */
ulint nth_file, /*!< in: header to the nth file in the
archive log file space */
ulint file_no, /*!< in: archived file number */
ib_uint64_t start_lsn) /*!< in: log file data starts at this
lsn */
{
byte* buf;
ulint dest_offset;
ut_ad(mutex_own(&(log_sys->mutex)));
ut_a(nth_file < group->n_files);
buf = *(group->archive_file_header_bufs + nth_file);
mach_write_to_4(buf + LOG_GROUP_ID, group->id);
mach_write_ull(buf + LOG_FILE_START_LSN, start_lsn);
mach_write_to_4(buf + LOG_FILE_NO, file_no);
mach_write_to_4(buf + LOG_FILE_ARCH_COMPLETED, FALSE);
dest_offset = nth_file * group->file_size;
log_sys->n_log_ios++;
fil_io(OS_FILE_WRITE | OS_FILE_LOG, TRUE, group->archive_space_id,
dest_offset / UNIV_PAGE_SIZE,
dest_offset % UNIV_PAGE_SIZE,
2 * OS_FILE_LOG_BLOCK_SIZE,
buf, &log_archive_io);
}
/******************************************************//**
Writes a log file header to a completed archived log file. */
static
void
log_group_archive_completed_header_write(
/*=====================================*/
log_group_t* group, /*!< in: log group */
ulint nth_file, /*!< in: header to the nth file in the
archive log file space */
ib_uint64_t end_lsn) /*!< in: end lsn of the file */
{
byte* buf;
ulint dest_offset;
ut_ad(mutex_own(&(log_sys->mutex)));
ut_a(nth_file < group->n_files);
buf = *(group->archive_file_header_bufs + nth_file);
mach_write_to_4(buf + LOG_FILE_ARCH_COMPLETED, TRUE);
mach_write_ull(buf + LOG_FILE_END_LSN, end_lsn);
dest_offset = nth_file * group->file_size + LOG_FILE_ARCH_COMPLETED;
log_sys->n_log_ios++;
fil_io(OS_FILE_WRITE | OS_FILE_LOG, TRUE, group->archive_space_id,
dest_offset / UNIV_PAGE_SIZE,
dest_offset % UNIV_PAGE_SIZE,
OS_FILE_LOG_BLOCK_SIZE,
buf + LOG_FILE_ARCH_COMPLETED,
&log_archive_io);
}
/******************************************************//**
Does the archive writes for a single log group. */
static
void
log_group_archive(
/*==============*/
log_group_t* group) /*!< in: log group */
{
os_file_t file_handle;
ib_uint64_t start_lsn;
ib_uint64_t end_lsn;
char name[1024];
byte* buf;
ulint len;
ibool ret;
ulint next_offset;
ulint n_files;
ulint open_mode;
ut_ad(mutex_own(&(log_sys->mutex)));
start_lsn = log_sys->archived_lsn;
ut_a(start_lsn % OS_FILE_LOG_BLOCK_SIZE == 0);
end_lsn = log_sys->next_archived_lsn;
ut_a(end_lsn % OS_FILE_LOG_BLOCK_SIZE == 0);
buf = log_sys->archive_buf;
n_files = 0;
next_offset = group->archived_offset;
loop:
if ((next_offset % group->file_size == 0)
|| (fil_space_get_size(group->archive_space_id) == 0)) {
/* Add the file to the archive file space; create or open the
file */
if (next_offset % group->file_size == 0) {
open_mode = OS_FILE_CREATE;
} else {
open_mode = OS_FILE_OPEN;
}
log_archived_file_name_gen(name, group->id,
group->archived_file_no + n_files);
file_handle = os_file_create(innodb_file_log_key,
name, open_mode,
OS_FILE_AIO,
OS_DATA_FILE, &ret);
if (!ret && (open_mode == OS_FILE_CREATE)) {
file_handle = os_file_create(
innodb_file_log_key, name, OS_FILE_OPEN,
OS_FILE_AIO, OS_DATA_FILE, &ret);
}
if (!ret) {
fprintf(stderr,
"InnoDB: Cannot create or open"
" archive log file %s.\n"
"InnoDB: Cannot continue operation.\n"
"InnoDB: Check that the log archive"
" directory exists,\n"
"InnoDB: you have access rights to it, and\n"
"InnoDB: there is space available.\n", name);
exit(1);
}
#ifdef UNIV_DEBUG
if (log_debug_writes) {
fprintf(stderr, "Created archive file %s\n", name);
}
#endif /* UNIV_DEBUG */
ret = os_file_close(file_handle);
ut_a(ret);
/* Add the archive file as a node to the space */
fil_node_create(name, group->file_size / UNIV_PAGE_SIZE,
group->archive_space_id, FALSE);
if (next_offset % group->file_size == 0) {
log_group_archive_file_header_write(
group, n_files,
group->archived_file_no + n_files,
start_lsn);
next_offset += LOG_FILE_HDR_SIZE;
}
}
len = end_lsn - start_lsn;
if (group->file_size < (next_offset % group->file_size) + len) {
len = group->file_size - (next_offset % group->file_size);
}
#ifdef UNIV_DEBUG
if (log_debug_writes) {
fprintf(stderr,
"Archiving starting at lsn %llu, len %lu"
" to group %lu\n",
start_lsn,
(ulong) len, (ulong) group->id);
}
#endif /* UNIV_DEBUG */
log_sys->n_pending_archive_ios++;
log_sys->n_log_ios++;
fil_io(OS_FILE_WRITE | OS_FILE_LOG, FALSE, group->archive_space_id,
next_offset / UNIV_PAGE_SIZE, next_offset % UNIV_PAGE_SIZE,
ut_calc_align(len, OS_FILE_LOG_BLOCK_SIZE), buf,
&log_archive_io);
start_lsn += len;
next_offset += len;
buf += len;
if (next_offset % group->file_size == 0) {
n_files++;
}
if (end_lsn != start_lsn) {
goto loop;
}
group->next_archived_file_no = group->archived_file_no + n_files;
group->next_archived_offset = next_offset % group->file_size;
ut_a(group->next_archived_offset % OS_FILE_LOG_BLOCK_SIZE == 0);
}
/*****************************************************//**
(Writes to the archive of each log group.) Currently, only the first
group is archived. */
static
void
log_archive_groups(void)
/*====================*/
{
log_group_t* group;
ut_ad(mutex_own(&(log_sys->mutex)));
group = UT_LIST_GET_FIRST(log_sys->log_groups);
log_group_archive(group);
}
/*****************************************************//**
Completes the archiving write phase for (each log group), currently,
the first log group. */
static
void
log_archive_write_complete_groups(void)
/*===================================*/
{
log_group_t* group;
ulint end_offset;
ulint trunc_files;
ulint n_files;
ib_uint64_t start_lsn;
ib_uint64_t end_lsn;
ulint i;
ut_ad(mutex_own(&(log_sys->mutex)));
group = UT_LIST_GET_FIRST(log_sys->log_groups);
group->archived_file_no = group->next_archived_file_no;
group->archived_offset = group->next_archived_offset;
/* Truncate from the archive file space all but the last
file, or if it has been written full, all files */
n_files = (UNIV_PAGE_SIZE
* fil_space_get_size(group->archive_space_id))
/ group->file_size;
ut_ad(n_files > 0);
end_offset = group->archived_offset;
if (end_offset % group->file_size == 0) {
trunc_files = n_files;
} else {
trunc_files = n_files - 1;
}
#ifdef UNIV_DEBUG
if (log_debug_writes && trunc_files) {
fprintf(stderr,
"Complete file(s) archived to group %lu\n",
(ulong) group->id);
}
#endif /* UNIV_DEBUG */
/* Calculate the archive file space start lsn */
start_lsn = log_sys->next_archived_lsn
- (end_offset - LOG_FILE_HDR_SIZE + trunc_files
* (group->file_size - LOG_FILE_HDR_SIZE));
end_lsn = start_lsn;
for (i = 0; i < trunc_files; i++) {
end_lsn += group->file_size - LOG_FILE_HDR_SIZE;
/* Write a notice to the headers of archived log
files that the file write has been completed */
log_group_archive_completed_header_write(group, i, end_lsn);
}
fil_space_truncate_start(group->archive_space_id,
trunc_files * group->file_size);
#ifdef UNIV_DEBUG
if (log_debug_writes) {
fputs("Archiving writes completed\n", stderr);
}
#endif /* UNIV_DEBUG */
}
/******************************************************//**
Completes an archiving i/o. */
static
void
log_archive_check_completion_low(void)
/*==================================*/
{
ut_ad(mutex_own(&(log_sys->mutex)));
if (log_sys->n_pending_archive_ios == 0
&& log_sys->archiving_phase == LOG_ARCHIVE_READ) {
#ifdef UNIV_DEBUG
if (log_debug_writes) {
fputs("Archiving read completed\n", stderr);
}
#endif /* UNIV_DEBUG */
/* Archive buffer has now been read in: start archive writes */
log_sys->archiving_phase = LOG_ARCHIVE_WRITE;
log_archive_groups();
}
if (log_sys->n_pending_archive_ios == 0
&& log_sys->archiving_phase == LOG_ARCHIVE_WRITE) {
log_archive_write_complete_groups();
log_sys->archived_lsn = log_sys->next_archived_lsn;
rw_lock_x_unlock_gen(&(log_sys->archive_lock), LOG_ARCHIVE);
}
}
/******************************************************//**
Completes an archiving i/o. */
static
void
log_io_complete_archive(void)
/*=========================*/
{
log_group_t* group;
mutex_enter(&(log_sys->mutex));
group = UT_LIST_GET_FIRST(log_sys->log_groups);
mutex_exit(&(log_sys->mutex));
fil_flush(group->archive_space_id);
mutex_enter(&(log_sys->mutex));
ut_ad(log_sys->n_pending_archive_ios > 0);
log_sys->n_pending_archive_ios--;
log_archive_check_completion_low();
mutex_exit(&(log_sys->mutex));
}
/********************************************************************//**
Starts an archiving operation.
@return TRUE if succeed, FALSE if an archiving operation was already running */
UNIV_INTERN
ibool
log_archive_do(
/*===========*/
ibool sync, /*!< in: TRUE if synchronous operation is desired */
ulint* n_bytes)/*!< out: archive log buffer size, 0 if nothing to
archive */
{
ibool calc_new_limit;
ib_uint64_t start_lsn;
ib_uint64_t limit_lsn;
calc_new_limit = TRUE;
loop:
mutex_enter(&(log_sys->mutex));
switch (log_sys->archiving_state) {
case LOG_ARCH_OFF:
arch_none:
mutex_exit(&(log_sys->mutex));
*n_bytes = 0;
return(TRUE);
case LOG_ARCH_STOPPED:
case LOG_ARCH_STOPPING2:
mutex_exit(&(log_sys->mutex));
os_event_wait(log_sys->archiving_on);
goto loop;
}
start_lsn = log_sys->archived_lsn;
if (calc_new_limit) {
ut_a(log_sys->archive_buf_size % OS_FILE_LOG_BLOCK_SIZE == 0);
limit_lsn = start_lsn + log_sys->archive_buf_size;
*n_bytes = log_sys->archive_buf_size;
if (limit_lsn >= log_sys->lsn) {
limit_lsn = ut_uint64_align_down(
log_sys->lsn, OS_FILE_LOG_BLOCK_SIZE);
}
}
if (log_sys->archived_lsn >= limit_lsn) {
goto arch_none;
}
if (log_sys->written_to_all_lsn < limit_lsn) {
mutex_exit(&(log_sys->mutex));
log_write_up_to(limit_lsn, LOG_WAIT_ALL_GROUPS, TRUE);
calc_new_limit = FALSE;
goto loop;
}
if (log_sys->n_pending_archive_ios > 0) {
/* An archiving operation is running */
mutex_exit(&(log_sys->mutex));
if (sync) {
rw_lock_s_lock(&(log_sys->archive_lock));
rw_lock_s_unlock(&(log_sys->archive_lock));
}
*n_bytes = log_sys->archive_buf_size;
return(FALSE);
}
rw_lock_x_lock_gen(&(log_sys->archive_lock), LOG_ARCHIVE);
log_sys->archiving_phase = LOG_ARCHIVE_READ;
log_sys->next_archived_lsn = limit_lsn;
#ifdef UNIV_DEBUG
if (log_debug_writes) {
fprintf(stderr,
"Archiving from lsn %llu to lsn %llu\n",
log_sys->archived_lsn, limit_lsn);
}
#endif /* UNIV_DEBUG */
/* Read the log segment to the archive buffer */
log_group_read_log_seg(LOG_ARCHIVE, log_sys->archive_buf,
UT_LIST_GET_FIRST(log_sys->log_groups),
start_lsn, limit_lsn);
mutex_exit(&(log_sys->mutex));
if (sync) {
rw_lock_s_lock(&(log_sys->archive_lock));
rw_lock_s_unlock(&(log_sys->archive_lock));
}
*n_bytes = log_sys->archive_buf_size;
return(TRUE);
}
/****************************************************************//**
Writes the log contents to the archive at least up to the lsn when this
function was called. */
static
void
log_archive_all(void)
/*=================*/
{
ib_uint64_t present_lsn;
ulint dummy;
mutex_enter(&(log_sys->mutex));
if (log_sys->archiving_state == LOG_ARCH_OFF) {
mutex_exit(&(log_sys->mutex));
return;
}
present_lsn = log_sys->lsn;
mutex_exit(&(log_sys->mutex));
log_pad_current_log_block();
for (;;) {
mutex_enter(&(log_sys->mutex));
if (present_lsn <= log_sys->archived_lsn) {
mutex_exit(&(log_sys->mutex));
return;
}
mutex_exit(&(log_sys->mutex));
log_archive_do(TRUE, &dummy);
}
}
/*****************************************************//**
Closes the possible open archive log file (for each group) the first group,
and if it was open, increments the group file count by 2, if desired. */
static
void
log_archive_close_groups(
/*=====================*/
ibool increment_file_count) /*!< in: TRUE if we want to increment
the file count */
{
log_group_t* group;
ulint trunc_len;
ut_ad(mutex_own(&(log_sys->mutex)));
if (log_sys->archiving_state == LOG_ARCH_OFF) {
return;
}
group = UT_LIST_GET_FIRST(log_sys->log_groups);
trunc_len = UNIV_PAGE_SIZE
* fil_space_get_size(group->archive_space_id);
if (trunc_len > 0) {
ut_a(trunc_len == group->file_size);
/* Write a notice to the headers of archived log
files that the file write has been completed */
log_group_archive_completed_header_write(
group, 0, log_sys->archived_lsn);
fil_space_truncate_start(group->archive_space_id,
trunc_len);
if (increment_file_count) {
group->archived_offset = 0;
group->archived_file_no += 2;
}
#ifdef UNIV_DEBUG
if (log_debug_writes) {
fprintf(stderr,
"Incrementing arch file no to %lu"
" in log group %lu\n",
(ulong) group->archived_file_no + 2,
(ulong) group->id);
}
#endif /* UNIV_DEBUG */
}
}
/****************************************************************//**
Writes the log contents to the archive up to the lsn when this function was
called, and stops the archiving. When archiving is started again, the archived
log file numbers start from 2 higher, so that the archiving will not write
again to the archived log files which exist when this function returns.
@return DB_SUCCESS or DB_ERROR */
UNIV_INTERN
ulint
log_archive_stop(void)
/*==================*/
{
ibool success;
mutex_enter(&(log_sys->mutex));
if (log_sys->archiving_state != LOG_ARCH_ON) {
mutex_exit(&(log_sys->mutex));
return(DB_ERROR);
}
log_sys->archiving_state = LOG_ARCH_STOPPING;
mutex_exit(&(log_sys->mutex));
log_archive_all();
mutex_enter(&(log_sys->mutex));
log_sys->archiving_state = LOG_ARCH_STOPPING2;
os_event_reset(log_sys->archiving_on);
mutex_exit(&(log_sys->mutex));
/* Wait for a possible archiving operation to end */
rw_lock_s_lock(&(log_sys->archive_lock));
rw_lock_s_unlock(&(log_sys->archive_lock));
mutex_enter(&(log_sys->mutex));
/* Close all archived log files, incrementing the file count by 2,
if appropriate */
log_archive_close_groups(TRUE);
mutex_exit(&(log_sys->mutex));
/* Make a checkpoint, so that if recovery is needed, the file numbers
of new archived log files will start from the right value */
success = FALSE;
while (!success) {
success = log_checkpoint(TRUE, TRUE);
}
mutex_enter(&(log_sys->mutex));
log_sys->archiving_state = LOG_ARCH_STOPPED;
mutex_exit(&(log_sys->mutex));
return(DB_SUCCESS);
}
/****************************************************************//**
Starts again archiving which has been stopped.
@return DB_SUCCESS or DB_ERROR */
UNIV_INTERN
ulint
log_archive_start(void)
/*===================*/
{
mutex_enter(&(log_sys->mutex));
if (log_sys->archiving_state != LOG_ARCH_STOPPED) {
mutex_exit(&(log_sys->mutex));
return(DB_ERROR);
}
log_sys->archiving_state = LOG_ARCH_ON;
os_event_set(log_sys->archiving_on);
mutex_exit(&(log_sys->mutex));
return(DB_SUCCESS);
}
/****************************************************************//**
Stop archiving the log so that a gap may occur in the archived log files.
@return DB_SUCCESS or DB_ERROR */
UNIV_INTERN
ulint
log_archive_noarchivelog(void)
/*==========================*/
{
loop:
mutex_enter(&(log_sys->mutex));
if (log_sys->archiving_state == LOG_ARCH_STOPPED
|| log_sys->archiving_state == LOG_ARCH_OFF) {
log_sys->archiving_state = LOG_ARCH_OFF;
os_event_set(log_sys->archiving_on);
mutex_exit(&(log_sys->mutex));
return(DB_SUCCESS);
}
mutex_exit(&(log_sys->mutex));
log_archive_stop();
os_thread_sleep(500000);
goto loop;
}
/****************************************************************//**
Start archiving the log so that a gap may occur in the archived log files.
@return DB_SUCCESS or DB_ERROR */
UNIV_INTERN
ulint
log_archive_archivelog(void)
/*========================*/
{
mutex_enter(&(log_sys->mutex));
if (log_sys->archiving_state == LOG_ARCH_OFF) {
log_sys->archiving_state = LOG_ARCH_ON;
log_sys->archived_lsn
= ut_uint64_align_down(log_sys->lsn,
OS_FILE_LOG_BLOCK_SIZE);
mutex_exit(&(log_sys->mutex));
return(DB_SUCCESS);
}
mutex_exit(&(log_sys->mutex));
return(DB_ERROR);
}
/****************************************************************//**
Tries to establish a big enough margin of free space in the log groups, such
that a new log entry can be catenated without an immediate need for
archiving. */
static
void
log_archive_margin(void)
/*====================*/
{
log_t* log = log_sys;
ulint age;
ibool sync;
ulint dummy;
loop:
mutex_enter(&(log->mutex));
if (log->archiving_state == LOG_ARCH_OFF) {
mutex_exit(&(log->mutex));
return;
}
age = log->lsn - log->archived_lsn;
if (age > log->max_archived_lsn_age) {
/* An archiving is urgent: we have to do synchronous i/o */
sync = TRUE;
} else if (age > log->max_archived_lsn_age_async) {
/* An archiving is not urgent: we do asynchronous i/o */
sync = FALSE;
} else {
/* No archiving required yet */
mutex_exit(&(log->mutex));
return;
}
mutex_exit(&(log->mutex));
log_archive_do(sync, &dummy);
if (sync == TRUE) {
/* Check again that enough was written to the archive */
goto loop;
}
}
#endif /* UNIV_LOG_ARCHIVE */
/********************************************************************//**
Checks that there is enough free space in the log to start a new query step.
Flushes the log buffer or makes a new checkpoint if necessary. NOTE: this
function may only be called if the calling thread owns no synchronization
objects! */
UNIV_INTERN
void
log_check_margins(void)
/*===================*/
{
loop:
log_flush_margin();
log_checkpoint_margin();
#ifdef UNIV_LOG_ARCHIVE
log_archive_margin();
#endif /* UNIV_LOG_ARCHIVE */
mutex_enter(&(log_sys->mutex));
ut_ad(!recv_no_log_write);
if (log_sys->check_flush_or_checkpoint) {
mutex_exit(&(log_sys->mutex));
goto loop;
}
mutex_exit(&(log_sys->mutex));
}
/****************************************************************//**
Makes a checkpoint at the latest lsn and writes it to first page of each
data file in the database, so that we know that the file spaces contain
all modifications up to that lsn. This can only be called at database
shutdown. This function also writes all log in log files to the log archive. */
UNIV_INTERN
void
logs_empty_and_mark_files_at_shutdown(void)
/*=======================================*/
{
ib_uint64_t lsn;
ulint arch_log_no;
if (srv_print_verbose_log) {
ut_print_timestamp(stderr);
fprintf(stderr, " InnoDB: Starting shutdown...\n");
}
/* Wait until the master thread and all other operations are idle: our
algorithm only works if the server is idle at shutdown */
srv_shutdown_state = SRV_SHUTDOWN_CLEANUP;
loop:
os_thread_sleep(100000);
mutex_enter(&kernel_mutex);
/* We need the monitor threads to stop before we proceed with a
normal shutdown. In case of very fast shutdown, however, we can
proceed without waiting for monitor threads. */
if (srv_fast_shutdown < 2
&& (srv_error_monitor_active
|| srv_lock_timeout_active || srv_monitor_active)) {
mutex_exit(&kernel_mutex);
goto loop;
}
/* Check that there are no longer transactions. We need this wait even
for the 'very fast' shutdown, because the InnoDB layer may have
committed or prepared transactions and we don't want to lose them. */
if (trx_n_mysql_transactions > 0
|| UT_LIST_GET_LEN(trx_sys->trx_list) > 0) {
mutex_exit(&kernel_mutex);
goto loop;
}
if (srv_fast_shutdown == 2) {
/* In this fastest shutdown we do not flush the buffer pool:
it is essentially a 'crash' of the InnoDB server. Make sure
that the log is all flushed to disk, so that we can recover
all committed transactions in a crash recovery. We must not
write the lsn stamps to the data files, since at a startup
InnoDB deduces from the stamps if the previous shutdown was
clean. */
log_buffer_flush_to_disk();
return; /* We SKIP ALL THE REST !! */
}
/* Check that the master thread is suspended */
if (srv_n_threads_active[SRV_MASTER] != 0) {
mutex_exit(&kernel_mutex);
goto loop;
}
mutex_exit(&kernel_mutex);
mutex_enter(&(log_sys->mutex));
if (log_sys->n_pending_checkpoint_writes
#ifdef UNIV_LOG_ARCHIVE
|| log_sys->n_pending_archive_ios
#endif /* UNIV_LOG_ARCHIVE */
|| log_sys->n_pending_writes) {
mutex_exit(&(log_sys->mutex));
goto loop;
}
mutex_exit(&(log_sys->mutex));
if (!buf_pool_check_no_pending_io()) {
goto loop;
}
#ifdef UNIV_LOG_ARCHIVE
log_archive_all();
#endif /* UNIV_LOG_ARCHIVE */
log_make_checkpoint_at(IB_ULONGLONG_MAX, TRUE);
mutex_enter(&(log_sys->mutex));
lsn = log_sys->lsn;
if (lsn != log_sys->last_checkpoint_lsn
#ifdef UNIV_LOG_ARCHIVE
|| (srv_log_archive_on
&& lsn != log_sys->archived_lsn + LOG_BLOCK_HDR_SIZE)
#endif /* UNIV_LOG_ARCHIVE */
) {
mutex_exit(&(log_sys->mutex));
goto loop;
}
arch_log_no = 0;
#ifdef UNIV_LOG_ARCHIVE
UT_LIST_GET_FIRST(log_sys->log_groups)->archived_file_no;
if (0 == UT_LIST_GET_FIRST(log_sys->log_groups)->archived_offset) {
arch_log_no--;
}
log_archive_close_groups(TRUE);
#endif /* UNIV_LOG_ARCHIVE */
mutex_exit(&(log_sys->mutex));
mutex_enter(&kernel_mutex);
/* Check that the master thread has stayed suspended */
if (srv_n_threads_active[SRV_MASTER] != 0) {
fprintf(stderr,
"InnoDB: Warning: the master thread woke up"
" during shutdown\n");
mutex_exit(&kernel_mutex);
goto loop;
}
mutex_exit(&kernel_mutex);
fil_flush_file_spaces(FIL_TABLESPACE);
fil_flush_file_spaces(FIL_LOG);
/* The call fil_write_flushed_lsn_to_data_files() will pass the buffer
pool: therefore it is essential that the buffer pool has been
completely flushed to disk! (We do not call fil_write... if the
'very fast' shutdown is enabled.) */
if (!buf_all_freed()) {
goto loop;
}
srv_shutdown_state = SRV_SHUTDOWN_LAST_PHASE;
/* Make some checks that the server really is quiet */
ut_a(srv_n_threads_active[SRV_MASTER] == 0);
ut_a(buf_all_freed());
ut_a(lsn == log_sys->lsn);
if (lsn < srv_start_lsn) {
fprintf(stderr,
"InnoDB: Error: log sequence number"
" at shutdown %llu\n"
"InnoDB: is lower than at startup %llu!\n",
lsn, srv_start_lsn);
}
srv_shutdown_lsn = lsn;
fil_write_flushed_lsn_to_data_files(lsn, arch_log_no);
fil_flush_file_spaces(FIL_TABLESPACE);
fil_close_all_files();
/* Make some checks that the server really is quiet */
ut_a(srv_n_threads_active[SRV_MASTER] == 0);
ut_a(buf_all_freed());
ut_a(lsn == log_sys->lsn);
}
#ifdef UNIV_LOG_DEBUG
/******************************************************//**
Checks by parsing that the catenated log segment for a single mtr is
consistent. */
UNIV_INTERN
ibool
log_check_log_recs(
/*===============*/
const byte* buf, /*!< in: pointer to the start of
the log segment in the
log_sys->buf log buffer */
ulint len, /*!< in: segment length in bytes */
ib_uint64_t buf_start_lsn) /*!< in: buffer start lsn */
{
ib_uint64_t contiguous_lsn;
ib_uint64_t scanned_lsn;
const byte* start;
const byte* end;
byte* buf1;
byte* scan_buf;
ut_ad(mutex_own(&(log_sys->mutex)));
if (len == 0) {
return(TRUE);
}
start = ut_align_down(buf, OS_FILE_LOG_BLOCK_SIZE);
end = ut_align(buf + len, OS_FILE_LOG_BLOCK_SIZE);
buf1 = mem_alloc((end - start) + OS_FILE_LOG_BLOCK_SIZE);
scan_buf = ut_align(buf1, OS_FILE_LOG_BLOCK_SIZE);
ut_memcpy(scan_buf, start, end - start);
recv_scan_log_recs((buf_pool->curr_size
- recv_n_pool_free_frames) * UNIV_PAGE_SIZE,
FALSE, scan_buf, end - start,
ut_uint64_align_down(buf_start_lsn,
OS_FILE_LOG_BLOCK_SIZE),
&contiguous_lsn, &scanned_lsn);
ut_a(scanned_lsn == buf_start_lsn + len);
ut_a(recv_sys->recovered_lsn == scanned_lsn);
mem_free(buf1);
return(TRUE);
}
#endif /* UNIV_LOG_DEBUG */
/******************************************************//**
Peeks the current lsn.
@return TRUE if success, FALSE if could not get the log system mutex */
UNIV_INTERN
ibool
log_peek_lsn(
/*=========*/
ib_uint64_t* lsn) /*!< out: if returns TRUE, current lsn is here */
{
if (0 == mutex_enter_nowait(&(log_sys->mutex))) {
*lsn = log_sys->lsn;
mutex_exit(&(log_sys->mutex));
return(TRUE);
}
return(FALSE);
}
/******************************************************//**
Prints info of the log. */
UNIV_INTERN
void
log_print(
/*======*/
FILE* file) /*!< in: file where to print */
{
double time_elapsed;
time_t current_time;
mutex_enter(&(log_sys->mutex));
fprintf(file,
"Log sequence number %llu\n"
"Log flushed up to %llu\n"
"Last checkpoint at %llu\n",
log_sys->lsn,
log_sys->flushed_to_disk_lsn,
log_sys->last_checkpoint_lsn);
current_time = time(NULL);
time_elapsed = 0.001 + difftime(current_time,
log_sys->last_printout_time);
fprintf(file,
"%lu pending log writes, %lu pending chkp writes\n"
"%lu log i/o's done, %.2f log i/o's/second\n",
(ulong) log_sys->n_pending_writes,
(ulong) log_sys->n_pending_checkpoint_writes,
(ulong) log_sys->n_log_ios,
((log_sys->n_log_ios - log_sys->n_log_ios_old)
/ time_elapsed));
log_sys->n_log_ios_old = log_sys->n_log_ios;
log_sys->last_printout_time = current_time;
mutex_exit(&(log_sys->mutex));
}
/**********************************************************************//**
Refreshes the statistics used to print per-second averages. */
UNIV_INTERN
void
log_refresh_stats(void)
/*===================*/
{
log_sys->n_log_ios_old = log_sys->n_log_ios;
log_sys->last_printout_time = time(NULL);
}
/**********************************************************************
Closes a log group. */
static
void
log_group_close(
/*===========*/
log_group_t* group) /* in,own: log group to close */
{
ulint i;
for (i = 0; i < group->n_files; i++) {
mem_free(group->file_header_bufs_ptr[i]);
#ifdef UNIV_LOG_ARCHIVE
mem_free(group->archive_file_header_bufs_ptr[i]);
#endif /* UNIV_LOG_ARCHIVE */
}
mem_free(group->file_header_bufs_ptr);
mem_free(group->file_header_bufs);
#ifdef UNIV_LOG_ARCHIVE
mem_free(group->archive_file_header_bufs_ptr);
mem_free(group->archive_file_header_bufs);
#endif /* UNIV_LOG_ARCHIVE */
mem_free(group->checkpoint_buf_ptr);
mem_free(group);
}
/**********************************************************
Shutdown the log system but do not release all the memory. */
UNIV_INTERN
void
log_shutdown(void)
/*==============*/
{
log_group_t* group;
group = UT_LIST_GET_FIRST(log_sys->log_groups);
while (UT_LIST_GET_LEN(log_sys->log_groups) > 0) {
log_group_t* prev_group = group;
group = UT_LIST_GET_NEXT(log_groups, group);
UT_LIST_REMOVE(log_groups, log_sys->log_groups, prev_group);
log_group_close(prev_group);
}
mem_free(log_sys->buf_ptr);
log_sys->buf_ptr = NULL;
log_sys->buf = NULL;
mem_free(log_sys->checkpoint_buf_ptr);
log_sys->checkpoint_buf_ptr = NULL;
log_sys->checkpoint_buf = NULL;
os_event_free(log_sys->no_flush_event);
os_event_free(log_sys->one_flushed_event);
rw_lock_free(&log_sys->checkpoint_lock);
mutex_free(&log_sys->mutex);
#ifdef UNIV_LOG_ARCHIVE
rw_lock_free(&log_sys->archive_lock);
os_event_create(log_sys->archiving_on);
#endif /* UNIV_LOG_ARCHIVE */
#ifdef UNIV_LOG_DEBUG
recv_sys_debug_free();
#endif
recv_sys_close();
}
/**********************************************************
Free the log system data structures. */
UNIV_INTERN
void
log_mem_free(void)
/*==============*/
{
if (log_sys != NULL) {
recv_sys_mem_free();
mem_free(log_sys);
log_sys = NULL;
}
}
#endif /* !UNIV_HOTBACKUP */
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