log.cc 172 KB
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/* Copyright 2000-2008 MySQL AB, 2008 Sun Microsystems, Inc.
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   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
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   the Free Software Foundation; version 2 of the License.
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   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.
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   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 */


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/**
  @file

  @brief
  logging of commands

  @todo
    Abort logging when we get an error in reading or writing log files
*/
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#include "mysql_priv.h"
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#include "sql_repl.h"
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#include "rpl_filter.h"
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#include "rpl_rli.h"
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#include <my_dir.h>
#include <stdarg.h>
#include <m_ctype.h>				// For test_if_number

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#ifdef __NT__
#include "message.h"
#endif

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#include <mysql/plugin.h>

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/* max size of the log message */
#define MAX_LOG_BUFFER_SIZE 1024
#define MAX_USER_HOST_SIZE 512
#define MAX_TIME_SIZE 32
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#define MY_OFF_T_UNDEF (~(my_off_t)0UL)
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#define FLAGSTR(V,F) ((V)&(F)?#F" ":"")
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LOGGER logger;

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MYSQL_BIN_LOG mysql_bin_log;
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ulong sync_binlog_counter= 0;
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static bool test_if_number(const char *str,
			   long *res, bool allow_wildcards);
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static int binlog_init(void *p);
static int binlog_close_connection(handlerton *hton, THD *thd);
static int binlog_savepoint_set(handlerton *hton, THD *thd, void *sv);
static int binlog_savepoint_rollback(handlerton *hton, THD *thd, void *sv);
static int binlog_commit(handlerton *hton, THD *thd, bool all);
static int binlog_rollback(handlerton *hton, THD *thd, bool all);
static int binlog_prepare(handlerton *hton, THD *thd, bool all);
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/**
  Silence all errors and warnings reported when performing a write
  to a log table.
  Errors and warnings are not reported to the client or SQL exception
  handlers, so that the presence of logging does not interfere and affect
  the logic of an application.
*/
class Silence_log_table_errors : public Internal_error_handler
{
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  char m_message[MYSQL_ERRMSG_SIZE];
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public:
  Silence_log_table_errors()
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  {
    m_message[0]= '\0';
  }
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  virtual ~Silence_log_table_errors() {}

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  virtual bool handle_error(uint sql_errno, const char *message,
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                            MYSQL_ERROR::enum_warning_level level,
                            THD *thd);
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  const char *message() const { return m_message; }
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};

bool
Silence_log_table_errors::handle_error(uint /* sql_errno */,
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                                       const char *message_arg,
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                                       MYSQL_ERROR::enum_warning_level /* level */,
                                       THD * /* thd */)
{
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  strmake(m_message, message_arg, sizeof(m_message)-1);
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  return TRUE;
}


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sql_print_message_func sql_print_message_handlers[3] =
{
  sql_print_information,
  sql_print_warning,
  sql_print_error
};


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char *make_default_log_name(char *buff,const char* log_ext)
{
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  strmake(buff, pidfile_name, FN_REFLEN-5);
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  return fn_format(buff, buff, mysql_data_home, log_ext,
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                   MYF(MY_UNPACK_FILENAME|MY_REPLACE_EXT));
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}

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/*
  Helper class to hold a mutex for the duration of the
  block.

  Eliminates the need for explicit unlocking of mutexes on, e.g.,
  error returns.  On passing a null pointer, the sentry will not do
  anything.
 */
class Mutex_sentry
{
public:
  Mutex_sentry(pthread_mutex_t *mutex)
    : m_mutex(mutex)
  {
    if (m_mutex)
      pthread_mutex_lock(mutex);
  }

  ~Mutex_sentry()
  {
    if (m_mutex)
      pthread_mutex_unlock(m_mutex);
#ifndef DBUG_OFF
    m_mutex= 0;
#endif
  }

private:
  pthread_mutex_t *m_mutex;

  // It's not allowed to copy this object in any way
  Mutex_sentry(Mutex_sentry const&);
  void operator=(Mutex_sentry const&);
};

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/*
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  Helper class to store binary log transaction data.
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*/
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class binlog_trx_data {
public:
  binlog_trx_data()
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    : at_least_one_stmt_committed(0), incident(FALSE), m_pending(0),
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    before_stmt_pos(MY_OFF_T_UNDEF)
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  {
    trans_log.end_of_file= max_binlog_cache_size;
  }

  ~binlog_trx_data()
  {
    DBUG_ASSERT(pending() == NULL);
    close_cached_file(&trans_log);
  }

  my_off_t position() const {
    return my_b_tell(&trans_log);
  }

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  bool empty() const
  {
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    return pending() == NULL && my_b_tell(&trans_log) == 0;
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  }
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  /*
    Truncate the transaction cache to a certain position. This
    includes deleting the pending event.
   */
  void truncate(my_off_t pos)
  {
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    DBUG_PRINT("info", ("truncating to position %lu", (ulong) pos));
    DBUG_PRINT("info", ("before_stmt_pos=%lu", (ulong) pos));
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    if (pending())
    {
      delete pending();
    }
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    set_pending(0);
    reinit_io_cache(&trans_log, WRITE_CACHE, pos, 0, 0);
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    trans_log.end_of_file= max_binlog_cache_size;
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    if (pos < before_stmt_pos)
      before_stmt_pos= MY_OFF_T_UNDEF;
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    /*
      The only valid positions that can be truncated to are at the
      beginning of a statement. We are relying on this fact to be able
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      to set the at_least_one_stmt_committed flag correctly. In other word, if
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      we are truncating to the beginning of the transaction cache,
      there will be no statements in the cache, otherwhise, we will
      have at least one statement in the transaction cache.
     */
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    at_least_one_stmt_committed= (pos > 0);
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  }

  /*
    Reset the entire contents of the transaction cache, emptying it
    completely.
   */
  void reset() {
    if (!empty())
      truncate(0);
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    before_stmt_pos= MY_OFF_T_UNDEF;
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    incident= FALSE;
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    trans_log.end_of_file= max_binlog_cache_size;
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    DBUG_ASSERT(empty());
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  }

  Rows_log_event *pending() const
  {
    return m_pending;
  }

  void set_pending(Rows_log_event *const pending)
  {
    m_pending= pending;
  }

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  IO_CACHE trans_log;                         // The transaction cache
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  void set_incident(void)
  {
    incident= TRUE;
  }
  
  bool has_incident(void)
  {
    return(incident);
  }

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  /**
    Boolean that is true if there is at least one statement in the
    transaction cache.
  */
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  bool at_least_one_stmt_committed;
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  bool incident;
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private:
  /*
    Pending binrows event. This event is the event where the rows are
    currently written.
   */
  Rows_log_event *m_pending;

public:
  /*
    Binlog position before the start of the current statement.
  */
  my_off_t before_stmt_pos;
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};

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handlerton *binlog_hton;
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bool LOGGER::is_log_table_enabled(uint log_table_type)
{
  switch (log_table_type) {
  case QUERY_LOG_SLOW:
    return (table_log_handler != NULL) && opt_slow_log;
  case QUERY_LOG_GENERAL:
    return (table_log_handler != NULL) && opt_log ;
  default:
    DBUG_ASSERT(0);
    return FALSE;                             /* make compiler happy */
  }
}

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/* Check if a given table is opened log table */
int check_if_log_table(uint db_len, const char *db, uint table_name_len,
                       const char *table_name, uint check_if_opened)
{
  if (db_len == 5 &&
      !(lower_case_table_names ?
        my_strcasecmp(system_charset_info, db, "mysql") :
        strcmp(db, "mysql")))
  {
    if (table_name_len == 11 && !(lower_case_table_names ?
                                  my_strcasecmp(system_charset_info,
                                                table_name, "general_log") :
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                                  strcmp(table_name, "general_log")))
    {
      if (!check_if_opened || logger.is_log_table_enabled(QUERY_LOG_GENERAL))
        return QUERY_LOG_GENERAL;
      return 0;
    }

    if (table_name_len == 8 && !(lower_case_table_names ?
      my_strcasecmp(system_charset_info, table_name, "slow_log") :
      strcmp(table_name, "slow_log")))
    {
      if (!check_if_opened || logger.is_log_table_enabled(QUERY_LOG_SLOW))
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        return QUERY_LOG_SLOW;
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      return 0;
    }
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  }
  return 0;
}

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Log_to_csv_event_handler::Log_to_csv_event_handler()
{
}


Log_to_csv_event_handler::~Log_to_csv_event_handler()
{
}

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void Log_to_csv_event_handler::cleanup()
{
  logger.is_log_tables_initialized= FALSE;
}

/* log event handlers */

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/**
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  Log command to the general log table

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  Log given command to the general log table.

  @param  event_time        command start timestamp
  @param  user_host         the pointer to the string with user@host info
  @param  user_host_len     length of the user_host string. this is computed
                            once and passed to all general log event handlers
  @param  thread_id         Id of the thread, issued a query
  @param  command_type      the type of the command being logged
  @param  command_type_len  the length of the string above
  @param  sql_text          the very text of the query being executed
  @param  sql_text_len      the length of sql_text string


  @return This function attempts to never call my_error(). This is
  necessary, because general logging happens already after a statement
  status has been sent to the client, so the client can not see the
  error anyway. Besides, the error is not related to the statement
  being executed and is internal, and thus should be handled
  internally (@todo: how?).
  If a write to the table has failed, the function attempts to
  write to a short error message to the file. The failure is also
  indicated in the return value. 

  @retval  FALSE   OK
  @retval  TRUE    error occured
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*/

bool Log_to_csv_event_handler::
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  log_general(THD *thd, time_t event_time, const char *user_host,
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              uint user_host_len, int thread_id,
              const char *command_type, uint command_type_len,
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              const char *sql_text, uint sql_text_len,
              CHARSET_INFO *client_cs)
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{
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  TABLE_LIST table_list;
  TABLE *table;
  bool result= TRUE;
  bool need_close= FALSE;
  bool need_pop= FALSE;
  bool need_rnd_end= FALSE;
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  uint field_index;
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  Silence_log_table_errors error_handler;
  Open_tables_state open_tables_backup;
  ulonglong save_thd_options;
  bool save_time_zone_used;

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  /*
    CSV uses TIME_to_timestamp() internally if table needs to be repaired
    which will set thd->time_zone_used
  */
  save_time_zone_used= thd->time_zone_used;
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  save_thd_options= thd->options;
  thd->options&= ~OPTION_BIN_LOG;

  bzero(& table_list, sizeof(TABLE_LIST));
  table_list.alias= table_list.table_name= GENERAL_LOG_NAME.str;
  table_list.table_name_length= GENERAL_LOG_NAME.length;

  table_list.lock_type= TL_WRITE_CONCURRENT_INSERT;

  table_list.db= MYSQL_SCHEMA_NAME.str;
  table_list.db_length= MYSQL_SCHEMA_NAME.length;

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  /*
    1) open_performance_schema_table generates an error of the
    table can not be opened or is corrupted.
    2) "INSERT INTO general_log" can generate warning sometimes.

    Suppress these warnings and errors, they can't be dealt with
    properly anyway.

    QQ: this problem needs to be studied in more detail.
    Comment this 2 lines and run "cast.test" to see what's happening.
  */
  thd->push_internal_handler(& error_handler);
  need_pop= TRUE;

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  if (!(table= open_performance_schema_table(thd, & table_list,
                                             & open_tables_backup)))
    goto err;

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  need_close= TRUE;

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  if (table->file->extra(HA_EXTRA_MARK_AS_LOG_TABLE) ||
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      table->file->ha_rnd_init(0))
    goto err;

  need_rnd_end= TRUE;

  /* Honor next number columns if present */
  table->next_number_field= table->found_next_number_field;
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  /*
    NOTE: we do not call restore_record() here, as all fields are
    filled by the Logger (=> no need to load default ones).
  */

  /*
    We do not set a value for table->field[0], as it will use
    default value (which is CURRENT_TIMESTAMP).
  */
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  /* check that all columns exist */
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  if (table->s->fields < 6)
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    goto err;

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  DBUG_ASSERT(table->field[0]->type() == MYSQL_TYPE_TIMESTAMP);

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  ((Field_timestamp*) table->field[0])->store_timestamp((my_time_t)
                                                        event_time);
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  /* do a write */
  if (table->field[1]->store(user_host, user_host_len, client_cs) ||
      table->field[2]->store((longlong) thread_id, TRUE) ||
      table->field[3]->store((longlong) server_id, TRUE) ||
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      table->field[4]->store(command_type, command_type_len, client_cs))
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    goto err;

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  /*
    A positive return value in store() means truncation.
    Still logging a message in the log in this case.
  */
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  table->field[5]->flags|= FIELDFLAG_HEX_ESCAPE;
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  if (table->field[5]->store(sql_text, sql_text_len, client_cs) < 0)
    goto err;
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  /* mark all fields as not null */
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  table->field[1]->set_notnull();
  table->field[2]->set_notnull();
  table->field[3]->set_notnull();
  table->field[4]->set_notnull();
  table->field[5]->set_notnull();
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  /* Set any extra columns to their default values */
  for (field_index= 6 ; field_index < table->s->fields ; field_index++)
  {
    table->field[field_index]->set_default();
  }

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  /* log table entries are not replicated */
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  if (table->file->ha_write_row(table->record[0]))
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    goto err;
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  result= FALSE;
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err:
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  if (result && !thd->killed)
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    sql_print_error("Failed to write to mysql.general_log: %s",
                    error_handler.message());
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  if (need_rnd_end)
  {
    table->file->ha_rnd_end();
    table->file->ha_release_auto_increment();
  }
  if (need_pop)
    thd->pop_internal_handler();
  if (need_close)
    close_performance_schema_table(thd, & open_tables_backup);

  thd->options= save_thd_options;
  thd->time_zone_used= save_time_zone_used;
  return result;
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}


/*
  Log a query to the slow log table

  SYNOPSIS
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    log_slow()
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    thd               THD of the query
    current_time      current timestamp
    query_start_arg   command start timestamp
    user_host         the pointer to the string with user@host info
    user_host_len     length of the user_host string. this is computed once
                      and passed to all general log event handlers
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    query_time        Amount of time the query took to execute (in microseconds)
    lock_time         Amount of time the query was locked (in microseconds)
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    is_command        The flag, which determines, whether the sql_text is a
                      query or an administrator command (these are treated
                      differently by the old logging routines)
    sql_text          the very text of the query or administrator command
                      processed
    sql_text_len      the length of sql_text string

  DESCRIPTION

   Log a query to the slow log table

  RETURN
    FALSE - OK
    TRUE - error occured
*/

bool Log_to_csv_event_handler::
  log_slow(THD *thd, time_t current_time, time_t query_start_arg,
           const char *user_host, uint user_host_len,
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           ulonglong query_utime, ulonglong lock_utime, bool is_command,
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           const char *sql_text, uint sql_text_len)
{
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  TABLE_LIST table_list;
  TABLE *table;
  bool result= TRUE;
  bool need_close= FALSE;
  bool need_rnd_end= FALSE;
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  Silence_log_table_errors error_handler;
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  Open_tables_state open_tables_backup;
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  CHARSET_INFO *client_cs= thd->variables.character_set_client;
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  bool save_time_zone_used;
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  DBUG_ENTER("Log_to_csv_event_handler::log_slow");
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  thd->push_internal_handler(& error_handler);
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  /*
    CSV uses TIME_to_timestamp() internally if table needs to be repaired
    which will set thd->time_zone_used
  */
  save_time_zone_used= thd->time_zone_used;

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  bzero(& table_list, sizeof(TABLE_LIST));
  table_list.alias= table_list.table_name= SLOW_LOG_NAME.str;
  table_list.table_name_length= SLOW_LOG_NAME.length;

  table_list.lock_type= TL_WRITE_CONCURRENT_INSERT;

  table_list.db= MYSQL_SCHEMA_NAME.str;
  table_list.db_length= MYSQL_SCHEMA_NAME.length;

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  if (!(table= open_performance_schema_table(thd, & table_list,
                                             & open_tables_backup)))
    goto err;
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  need_close= TRUE;

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  if (table->file->extra(HA_EXTRA_MARK_AS_LOG_TABLE) ||
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      table->file->ha_rnd_init(0))
    goto err;

  need_rnd_end= TRUE;

  /* Honor next number columns if present */
  table->next_number_field= table->found_next_number_field;
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  restore_record(table, s->default_values);    // Get empty record
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  /* check that all columns exist */
  if (table->s->fields < 11)
    goto err;

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  /* store the time and user values */
  DBUG_ASSERT(table->field[0]->type() == MYSQL_TYPE_TIMESTAMP);
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  ((Field_timestamp*) table->field[0])->store_timestamp((my_time_t)
                                                        current_time);
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  if (table->field[1]->store(user_host, user_host_len, client_cs))
    goto err;
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  if (query_start_arg)
  {
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    longlong query_time= (longlong) (query_utime/1000000);
    longlong lock_time=  (longlong) (lock_utime/1000000);
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    /*
      A TIME field can not hold the full longlong range; query_time or
      lock_time may be truncated without warning here, if greater than
      839 hours (~35 days)
    */
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    MYSQL_TIME t;
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    t.neg= 0;

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    /* fill in query_time field */
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    calc_time_from_sec(&t, (long) min(query_time, (longlong) TIME_MAX_VALUE_SECONDS), 0);
    if (table->field[2]->store_time(&t, MYSQL_TIMESTAMP_TIME))
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      goto err;
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    /* lock_time */
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    calc_time_from_sec(&t, (long) min(lock_time, (longlong) TIME_MAX_VALUE_SECONDS), 0);
    if (table->field[3]->store_time(&t, MYSQL_TIMESTAMP_TIME))
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      goto err;
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    /* rows_sent */
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    if (table->field[4]->store((longlong) thd->sent_row_count, TRUE))
      goto err;
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    /* rows_examined */
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    if (table->field[5]->store((longlong) thd->examined_row_count, TRUE))
      goto err;
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  }
  else
  {
    table->field[2]->set_null();
    table->field[3]->set_null();
    table->field[4]->set_null();
    table->field[5]->set_null();
  }
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  /* fill database field */
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  if (thd->db)
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  {
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    if (table->field[6]->store(thd->db, thd->db_length, client_cs))
      goto err;
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    table->field[6]->set_notnull();
  }
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  if (thd->stmt_depends_on_first_successful_insert_id_in_prev_stmt)
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  {
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    if (table->
        field[7]->store((longlong)
                        thd->first_successful_insert_id_in_prev_stmt_for_binlog,
                        TRUE))
      goto err;
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    table->field[7]->set_notnull();
  }
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  /*
    Set value if we do an insert on autoincrement column. Note that for
    some engines (those for which get_auto_increment() does not leave a
    table lock until the statement ends), this is just the first value and
    the next ones used may not be contiguous to it.
  */
  if (thd->auto_inc_intervals_in_cur_stmt_for_binlog.nb_elements() > 0)
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  {
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    if (table->
        field[8]->store((longlong)
          thd->auto_inc_intervals_in_cur_stmt_for_binlog.minimum(), TRUE))
      goto err;
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    table->field[8]->set_notnull();
  }
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  if (table->field[9]->store((longlong) server_id, TRUE))
    goto err;
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  table->field[9]->set_notnull();
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  /*
    Column sql_text.
    A positive return value in store() means truncation.
    Still logging a message in the log in this case.
  */
  if (table->field[10]->store(sql_text, sql_text_len, client_cs) < 0)
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    goto err;

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  /* log table entries are not replicated */
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  if (table->file->ha_write_row(table->record[0]))
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    goto err;
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  result= FALSE;
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err:
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  thd->pop_internal_handler();

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  if (result && !thd->killed)
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    sql_print_error("Failed to write to mysql.slow_log: %s",
                    error_handler.message());
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  if (need_rnd_end)
  {
    table->file->ha_rnd_end();
    table->file->ha_release_auto_increment();
  }
  if (need_close)
    close_performance_schema_table(thd, & open_tables_backup);
  thd->time_zone_used= save_time_zone_used;
  DBUG_RETURN(result);
}

int Log_to_csv_event_handler::
  activate_log(THD *thd, uint log_table_type)
{
  TABLE_LIST table_list;
  TABLE *table;
  int result;
  Open_tables_state open_tables_backup;

  DBUG_ENTER("Log_to_csv_event_handler::activate_log");

  bzero(& table_list, sizeof(TABLE_LIST));

  if (log_table_type == QUERY_LOG_GENERAL)
  {
    table_list.alias= table_list.table_name= GENERAL_LOG_NAME.str;
    table_list.table_name_length= GENERAL_LOG_NAME.length;
  }
  else
  {
    DBUG_ASSERT(log_table_type == QUERY_LOG_SLOW);
    table_list.alias= table_list.table_name= SLOW_LOG_NAME.str;
    table_list.table_name_length= SLOW_LOG_NAME.length;
  }

  table_list.lock_type= TL_WRITE_CONCURRENT_INSERT;

  table_list.db= MYSQL_SCHEMA_NAME.str;
  table_list.db_length= MYSQL_SCHEMA_NAME.length;

  table= open_performance_schema_table(thd, & table_list,
                                       & open_tables_backup);
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  if (table)
  {
    result= 0;
    close_performance_schema_table(thd, & open_tables_backup);
  }
  else
    result= 1;

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  DBUG_RETURN(result);
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}

bool Log_to_csv_event_handler::
  log_error(enum loglevel level, const char *format, va_list args)
{
  /* No log table is implemented */
  DBUG_ASSERT(0);
  return FALSE;
}

bool Log_to_file_event_handler::
  log_error(enum loglevel level, const char *format,
            va_list args)
{
  return vprint_msg_to_log(level, format, args);
}

void Log_to_file_event_handler::init_pthread_objects()
{
  mysql_log.init_pthread_objects();
  mysql_slow_log.init_pthread_objects();
}


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/** Wrapper around MYSQL_LOG::write() for slow log. */
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bool Log_to_file_event_handler::
  log_slow(THD *thd, time_t current_time, time_t query_start_arg,
           const char *user_host, uint user_host_len,
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           ulonglong query_utime, ulonglong lock_utime, bool is_command,
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           const char *sql_text, uint sql_text_len)
{
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  Silence_log_table_errors error_handler;
  thd->push_internal_handler(&error_handler);
  bool retval= mysql_slow_log.write(thd, current_time, query_start_arg,
                                    user_host, user_host_len,
                                    query_utime, lock_utime, is_command,
                                    sql_text, sql_text_len);
  thd->pop_internal_handler();
  return retval;
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}


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/**
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   Wrapper around MYSQL_LOG::write() for general log. We need it since we
   want all log event handlers to have the same signature.
*/

bool Log_to_file_event_handler::
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  log_general(THD *thd, time_t event_time, const char *user_host,
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              uint user_host_len, int thread_id,
              const char *command_type, uint command_type_len,
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              const char *sql_text, uint sql_text_len,
              CHARSET_INFO *client_cs)
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{
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  Silence_log_table_errors error_handler;
  thd->push_internal_handler(&error_handler);
  bool retval= mysql_log.write(event_time, user_host, user_host_len,
                               thread_id, command_type, command_type_len,
                               sql_text, sql_text_len);
  thd->pop_internal_handler();
  return retval;
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}


bool Log_to_file_event_handler::init()
{
  if (!is_initialized)
  {
    if (opt_slow_log)
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      mysql_slow_log.open_slow_log(sys_var_slow_log_path.value);
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    if (opt_log)
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      mysql_log.open_query_log(sys_var_general_log_path.value);
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    is_initialized= TRUE;
  }

  return FALSE;
}


void Log_to_file_event_handler::cleanup()
{
  mysql_log.cleanup();
  mysql_slow_log.cleanup();
}

void Log_to_file_event_handler::flush()
{
  /* reopen log files */
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  if (opt_log)
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    mysql_log.reopen_file();
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  if (opt_slow_log)
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    mysql_slow_log.reopen_file();
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}

/*
  Log error with all enabled log event handlers

  SYNOPSIS
    error_log_print()

    level             The level of the error significance: NOTE,
                      WARNING or ERROR.
    format            format string for the error message
    args              list of arguments for the format string

  RETURN
    FALSE - OK
    TRUE - error occured
*/

bool LOGGER::error_log_print(enum loglevel level, const char *format,
                             va_list args)
{
  bool error= FALSE;
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  Log_event_handler **current_handler;
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  /* currently we don't need locking here as there is no error_log table */
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  for (current_handler= error_log_handler_list ; *current_handler ;)
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    error= (*current_handler++)->log_error(level, format, args) || error;

  return error;
}


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void LOGGER::cleanup_base()
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{
  DBUG_ASSERT(inited == 1);
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  rwlock_destroy(&LOCK_logger);
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  if (table_log_handler)
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  {
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    table_log_handler->cleanup();
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    delete table_log_handler;
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    table_log_handler= NULL;
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  }
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  if (file_log_handler)
    file_log_handler->cleanup();
}


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void LOGGER::cleanup_end()
{
  DBUG_ASSERT(inited == 1);
  if (file_log_handler)
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  {
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    delete file_log_handler;
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    file_log_handler=NULL;
  }
  inited= 0;
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}


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/**
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  Perform basic log initialization: create file-based log handler and
  init error log.
*/
void LOGGER::init_base()
{
  DBUG_ASSERT(inited == 0);
  inited= 1;

  /*
    Here we create file log handler. We don't do it for the table log handler
    here as it cannot be created so early. The reason is THD initialization,
    which depends on the system variables (parsed later).
  */
  if (!file_log_handler)
    file_log_handler= new Log_to_file_event_handler;

  /* by default we use traditional error log */
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  init_error_log(LOG_FILE);
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  file_log_handler->init_pthread_objects();
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  my_rwlock_init(&LOCK_logger, NULL);
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}


void LOGGER::init_log_tables()
{
  if (!table_log_handler)
    table_log_handler= new Log_to_csv_event_handler;

  if (!is_log_tables_initialized &&
      !table_log_handler->init() && !file_log_handler->init())
    is_log_tables_initialized= TRUE;
}


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bool LOGGER::flush_logs(THD *thd)
{
  int rc= 0;
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  /*
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    Now we lock logger, as nobody should be able to use logging routines while
    log tables are closed
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  */
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  logger.lock_exclusive();
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  /* reopen log files */
  file_log_handler->flush();
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  /* end of log flush */
  logger.unlock();
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  return rc;
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}


/*
  Log slow query with all enabled log event handlers

  SYNOPSIS
    slow_log_print()

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    thd                 THD of the query being logged
    query               The query being logged
    query_length        The length of the query string
    current_utime       Current time in microseconds (from undefined start)
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  RETURN
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    FALSE   OK
    TRUE    error occured
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*/

bool LOGGER::slow_log_print(THD *thd, const char *query, uint query_length,
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                            ulonglong current_utime)

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{
  bool error= FALSE;
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  Log_event_handler **current_handler;
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  bool is_command= FALSE;
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  char user_host_buff[MAX_USER_HOST_SIZE + 1];
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  Security_context *sctx= thd->security_ctx;
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  uint user_host_len= 0;
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  ulonglong query_utime, lock_utime;
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  DBUG_ASSERT(thd->enable_slow_log);
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  /*
    Print the message to the buffer if we have slow log enabled
  */

  if (*slow_log_handler_list)
  {
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    time_t current_time;
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    /* do not log slow queries from replication threads */
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    if (thd->slave_thread && !opt_log_slow_slave_statements)
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      return 0;

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    lock_shared();
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    if (!opt_slow_log)
    {
      unlock();
      return 0;
    }
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    /* fill in user_host value: the format is "%s[%s] @ %s [%s]" */
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    user_host_len= (strxnmov(user_host_buff, MAX_USER_HOST_SIZE,
                             sctx->priv_user ? sctx->priv_user : "", "[",
                             sctx->user ? sctx->user : "", "] @ ",
                             sctx->host ? sctx->host : "", " [",
                             sctx->ip ? sctx->ip : "", "]", NullS) -
                    user_host_buff);

    current_time= my_time_possible_from_micro(current_utime);
    if (thd->start_utime)
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    {
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      query_utime= (current_utime - thd->start_utime);
      lock_utime=  (thd->utime_after_lock - thd->start_utime);
    }
    else
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    {
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      query_utime= lock_utime= 0;
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    }

    if (!query)
    {
      is_command= TRUE;
      query= command_name[thd->command].str;
      query_length= command_name[thd->command].length;
    }

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    for (current_handler= slow_log_handler_list; *current_handler ;)
      error= (*current_handler++)->log_slow(thd, current_time, thd->start_time,
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                                            user_host_buff, user_host_len,
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                                            query_utime, lock_utime, is_command,
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                                            query, query_length) || error;

    unlock();
  }
  return error;
}

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bool LOGGER::general_log_write(THD *thd, enum enum_server_command command,
                               const char *query, uint query_length)
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{
  bool error= FALSE;
  Log_event_handler **current_handler= general_log_handler_list;
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  char user_host_buff[MAX_USER_HOST_SIZE + 1];
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  Security_context *sctx= thd->security_ctx;
  uint user_host_len= 0;
  time_t current_time;
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  DBUG_ASSERT(thd);
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  lock_shared();
  if (!opt_log)
  {
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    unlock();
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    return 0;
  }
  user_host_len= strxnmov(user_host_buff, MAX_USER_HOST_SIZE,
                          sctx->priv_user ? sctx->priv_user : "", "[",
                          sctx->user ? sctx->user : "", "] @ ",
                          sctx->host ? sctx->host : "", " [",
                          sctx->ip ? sctx->ip : "", "]", NullS) -
                                                          user_host_buff;

  current_time= my_time(0);
  while (*current_handler)
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    error|= (*current_handler++)->
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      log_general(thd, current_time, user_host_buff,
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                  user_host_len, thd->thread_id,
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                  command_name[(uint) command].str,
                  command_name[(uint) command].length,
                  query, query_length,
                  thd->variables.character_set_client) || error;
  unlock();

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  return error;
}

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bool LOGGER::general_log_print(THD *thd, enum enum_server_command command,
                               const char *format, va_list args)
{
  uint message_buff_len= 0;
  char message_buff[MAX_LOG_BUFFER_SIZE];

  /* prepare message */
  if (format)
    message_buff_len= my_vsnprintf(message_buff, sizeof(message_buff),
                                   format, args);
  else
    message_buff[0]= '\0';

  return general_log_write(thd, command, message_buff, message_buff_len);
}

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void LOGGER::init_error_log(uint error_log_printer)
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{
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  if (error_log_printer & LOG_NONE)
  {
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    error_log_handler_list[0]= 0;
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    return;
  }

  switch (error_log_printer) {
  case LOG_FILE:
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    error_log_handler_list[0]= file_log_handler;
    error_log_handler_list[1]= 0;
    break;
    /* these two are disabled for now */
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  case LOG_TABLE:
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    DBUG_ASSERT(0);
    break;
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  case LOG_TABLE|LOG_FILE:
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    DBUG_ASSERT(0);
    break;
  }
}

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void LOGGER::init_slow_log(uint slow_log_printer)
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{
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  if (slow_log_printer & LOG_NONE)
  {
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    slow_log_handler_list[0]= 0;
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    return;
  }

  switch (slow_log_printer) {
  case LOG_FILE:
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    slow_log_handler_list[0]= file_log_handler;
    slow_log_handler_list[1]= 0;
    break;
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  case LOG_TABLE:
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    slow_log_handler_list[0]= table_log_handler;
    slow_log_handler_list[1]= 0;
    break;
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  case LOG_TABLE|LOG_FILE:
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    slow_log_handler_list[0]= file_log_handler;
    slow_log_handler_list[1]= table_log_handler;
    slow_log_handler_list[2]= 0;
    break;
  }
}

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void LOGGER::init_general_log(uint general_log_printer)
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{
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  if (general_log_printer & LOG_NONE)
  {
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    general_log_handler_list[0]= 0;
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    return;
  }

  switch (general_log_printer) {
  case LOG_FILE:
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    general_log_handler_list[0]= file_log_handler;
    general_log_handler_list[1]= 0;
    break;
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  case LOG_TABLE:
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    general_log_handler_list[0]= table_log_handler;
    general_log_handler_list[1]= 0;
    break;
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  case LOG_TABLE|LOG_FILE:
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    general_log_handler_list[0]= file_log_handler;
    general_log_handler_list[1]= table_log_handler;
    general_log_handler_list[2]= 0;
    break;
  }
}


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bool LOGGER::activate_log_handler(THD* thd, uint log_type)
{
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  MYSQL_QUERY_LOG *file_log;
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  bool res= FALSE;
  lock_exclusive();
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  switch (log_type) {
  case QUERY_LOG_SLOW:
    if (!opt_slow_log)
    {
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      file_log= file_log_handler->get_mysql_slow_log();

      file_log->open_slow_log(sys_var_slow_log_path.value);
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      if (table_log_handler->activate_log(thd, QUERY_LOG_SLOW))
      {
        /* Error printed by open table in activate_log() */
        res= TRUE;
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        file_log->close(0);
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      }
      else
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      {
        init_slow_log(log_output_options);
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        opt_slow_log= TRUE;
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      }
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    }
    break;
  case QUERY_LOG_GENERAL:
    if (!opt_log)
    {
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      file_log= file_log_handler->get_mysql_log();

      file_log->open_query_log(sys_var_general_log_path.value);
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      if (table_log_handler->activate_log(thd, QUERY_LOG_GENERAL))
      {
        /* Error printed by open table in activate_log() */
        res= TRUE;
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        file_log->close(0);
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      }
      else
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      {
        init_general_log(log_output_options);
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        opt_log= TRUE;
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      }
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    }
    break;
  default:
    DBUG_ASSERT(0);
  }
  unlock();
  return res;
}


void LOGGER::deactivate_log_handler(THD *thd, uint log_type)
{
  my_bool *tmp_opt= 0;
  MYSQL_LOG *file_log;

  switch (log_type) {
  case QUERY_LOG_SLOW:
    tmp_opt= &opt_slow_log;
    file_log= file_log_handler->get_mysql_slow_log();
    break;
  case QUERY_LOG_GENERAL:
    tmp_opt= &opt_log;
    file_log= file_log_handler->get_mysql_log();
    break;
  default:
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    MY_ASSERT_UNREACHABLE();
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  }

  if (!(*tmp_opt))
    return;

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  lock_exclusive();
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  file_log->close(0);
  *tmp_opt= FALSE;
  unlock();
}


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/* the parameters are unused for the log tables */
bool Log_to_csv_event_handler::init()
{
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  return 0;
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}

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int LOGGER::set_handlers(uint error_log_printer,
                         uint slow_log_printer,
                         uint general_log_printer)
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{
  /* error log table is not supported yet */
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  DBUG_ASSERT(error_log_printer < LOG_TABLE);
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  lock_exclusive();
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  if ((slow_log_printer & LOG_TABLE || general_log_printer & LOG_TABLE) &&
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      !is_log_tables_initialized)
  {
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    slow_log_printer= (slow_log_printer & ~LOG_TABLE) | LOG_FILE;
    general_log_printer= (general_log_printer & ~LOG_TABLE) | LOG_FILE;
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    sql_print_error("Failed to initialize log tables. "
                    "Falling back to the old-fashioned logs");
  }

  init_error_log(error_log_printer);
  init_slow_log(slow_log_printer);
  init_general_log(general_log_printer);

  unlock();

  return 0;
}

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/** 
    This function checks if a transactional talbe was updated by the
    current statement.

    @param thd The client thread that executed the current statement.
    @return
      @c true if a transactional table was updated, @false otherwise.
*/
static bool stmt_has_updated_trans_table(THD *thd)
{
  Ha_trx_info *ha_info;

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  for (ha_info= thd->transaction.stmt.ha_list; ha_info && ha_info->is_started(); ha_info= ha_info->next())
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  {
    if (ha_info->is_trx_read_write() && ha_info->ht() != binlog_hton)
      return (TRUE);
  }
  return (FALSE);
}
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 /*
  Save position of binary log transaction cache.

  SYNPOSIS
    binlog_trans_log_savepos()

    thd      The thread to take the binlog data from
    pos      Pointer to variable where the position will be stored

  DESCRIPTION

    Save the current position in the binary log transaction cache into
    the variable pointed to by 'pos'
 */

static void
binlog_trans_log_savepos(THD *thd, my_off_t *pos)
{
  DBUG_ENTER("binlog_trans_log_savepos");
  DBUG_ASSERT(pos != NULL);
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  if (thd_get_ha_data(thd, binlog_hton) == NULL)
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    thd->binlog_setup_trx_data();
  binlog_trx_data *const trx_data=
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    (binlog_trx_data*) thd_get_ha_data(thd, binlog_hton);
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  DBUG_ASSERT(mysql_bin_log.is_open());
  *pos= trx_data->position();
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  DBUG_PRINT("return", ("*pos: %lu", (ulong) *pos));
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  DBUG_VOID_RETURN;
}


/*
  Truncate the binary log transaction cache.

  SYNPOSIS
    binlog_trans_log_truncate()

    thd      The thread to take the binlog data from
    pos      Position to truncate to

  DESCRIPTION

    Truncate the binary log to the given position. Will not change
    anything else.

 */
static void
binlog_trans_log_truncate(THD *thd, my_off_t pos)
{
  DBUG_ENTER("binlog_trans_log_truncate");
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  DBUG_PRINT("enter", ("pos: %lu", (ulong) pos));
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  DBUG_ASSERT(thd_get_ha_data(thd, binlog_hton) != NULL);
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  /* Only true if binlog_trans_log_savepos() wasn't called before */
  DBUG_ASSERT(pos != ~(my_off_t) 0);

  binlog_trx_data *const trx_data=
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    (binlog_trx_data*) thd_get_ha_data(thd, binlog_hton);
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  trx_data->truncate(pos);
  DBUG_VOID_RETURN;
}


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/*
  this function is mostly a placeholder.
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  conceptually, binlog initialization (now mostly done in MYSQL_BIN_LOG::open)
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  should be moved here.
*/

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int binlog_init(void *p)
1357
{
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  binlog_hton= (handlerton *)p;
  binlog_hton->state=opt_bin_log ? SHOW_OPTION_YES : SHOW_OPTION_NO;
  binlog_hton->db_type=DB_TYPE_BINLOG;
  binlog_hton->savepoint_offset= sizeof(my_off_t);
  binlog_hton->close_connection= binlog_close_connection;
  binlog_hton->savepoint_set= binlog_savepoint_set;
  binlog_hton->savepoint_rollback= binlog_savepoint_rollback;
  binlog_hton->commit= binlog_commit;
  binlog_hton->rollback= binlog_rollback;
  binlog_hton->prepare= binlog_prepare;
  binlog_hton->flags= HTON_NOT_USER_SELECTABLE | HTON_HIDDEN;
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  return 0;
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}

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static int binlog_close_connection(handlerton *hton, THD *thd)
1373
{
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  binlog_trx_data *const trx_data=
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    (binlog_trx_data*) thd_get_ha_data(thd, binlog_hton);
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  DBUG_ASSERT(trx_data->empty());
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  thd_set_ha_data(thd, binlog_hton, NULL);
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  trx_data->~binlog_trx_data();
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  my_free((uchar*)trx_data, MYF(0));
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  return 0;
}

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/*
  End a transaction.

  SYNOPSIS
    binlog_end_trans()

    thd      The thread whose transaction should be ended
    trx_data Pointer to the transaction data to use
    end_ev   The end event to use, or NULL
    all      True if the entire transaction should be ended, false if
             only the statement transaction should be ended.

  DESCRIPTION

    End the currently open transaction. The transaction can be either
    a real transaction (if 'all' is true) or a statement transaction
    (if 'all' is false).

    If 'end_ev' is NULL, the transaction is a rollback of only
    transactional tables, so the transaction cache will be truncated
    to either just before the last opened statement transaction (if
    'all' is false), or reset completely (if 'all' is true).
 */
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static int
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binlog_end_trans(THD *thd, binlog_trx_data *trx_data,
                 Log_event *end_ev, bool all)
1409
{
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  DBUG_ENTER("binlog_end_trans");
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  int error=0;
  IO_CACHE *trans_log= &trx_data->trans_log;
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  DBUG_PRINT("enter", ("transaction: %s  end_ev: 0x%lx",
                       all ? "all" : "stmt", (long) end_ev));
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  DBUG_PRINT("info", ("thd->options={ %s%s}",
                      FLAGSTR(thd->options, OPTION_NOT_AUTOCOMMIT),
                      FLAGSTR(thd->options, OPTION_BEGIN)));
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  /*
    NULL denotes ROLLBACK with nothing to replicate: i.e., rollback of
    only transactional tables.  If the transaction contain changes to
    any non-transactiona tables, we need write the transaction and log
    a ROLLBACK last.
  */
1425
  if (end_ev != NULL)
1426
  {
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    if (thd->binlog_flush_pending_rows_event(TRUE))
      DBUG_RETURN(1);
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    /*
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      Doing a commit or a rollback including non-transactional tables,
      i.e., ending a transaction where we might write the transaction
      cache to the binary log.

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      We can always end the statement when ending a transaction since
      transactions are not allowed inside stored functions.  If they
      were, we would have to ensure that we're not ending a statement
      inside a stored function.
     */
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    error= mysql_bin_log.write(thd, &trx_data->trans_log, end_ev,
                               trx_data->has_incident());
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    trx_data->reset();

    statistic_increment(binlog_cache_use, &LOCK_status);
    if (trans_log->disk_writes != 0)
1445
    {
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      statistic_increment(binlog_cache_disk_use, &LOCK_status);
      trans_log->disk_writes= 0;
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    }
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  }
  else
  {
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    /*
      If rolling back an entire transaction or a single statement not
      inside a transaction, we reset the transaction cache.
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      If rolling back a statement in a transaction, we truncate the
      transaction cache to remove the statement.
     */
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    thd->binlog_remove_pending_rows_event(TRUE);
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    if (all || !(thd->options & (OPTION_BEGIN | OPTION_NOT_AUTOCOMMIT)))
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    {
      if (trx_data->has_incident())
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        error= mysql_bin_log.write_incident(thd, TRUE);
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      trx_data->reset();
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    }
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    else                                        // ...statement
      trx_data->truncate(trx_data->before_stmt_pos);
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  }
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  DBUG_ASSERT(thd->binlog_get_pending_rows_event() == NULL);
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  DBUG_RETURN(error);
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}

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static int binlog_prepare(handlerton *hton, THD *thd, bool all)
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{
  /*
    do nothing.
    just pretend we can do 2pc, so that MySQL won't
    switch to 1pc.
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    real work will be done in MYSQL_BIN_LOG::log_xid()
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  */
  return 0;
}

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/**
  This function is called once after each statement.

  It has the responsibility to flush the transaction cache to the
  binlog file on commits.

  @param hton  The binlog handlerton.
  @param thd   The client thread that executes the transaction.
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  @param all   This is @c true if this is a real transaction commit, and
               @false otherwise.
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  @see handlerton::commit
*/
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static int binlog_commit(handlerton *hton, THD *thd, bool all)
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{
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  int error= 0;
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  DBUG_ENTER("binlog_commit");
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  binlog_trx_data *const trx_data=
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    (binlog_trx_data*) thd_get_ha_data(thd, binlog_hton);
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1505
  if (trx_data->empty())
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  {
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    // we're here because trans_log was flushed in MYSQL_BIN_LOG::log_xid()
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    trx_data->reset();
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    DBUG_RETURN(0);
  }
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  /*
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    We flush the cache if:
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     - we are committing a transaction or;
     - no statement was committed before and just non-transactional
1517
       tables were updated.
1518

1519
    Otherwise, we collect the changes.
1520
  */
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  DBUG_PRINT("debug",
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             ("all: %d, empty: %s, all.modified_non_trans_table: %s, stmt.modified_non_trans_table: %s",
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              all,
              YESNO(trx_data->empty()),
              YESNO(thd->transaction.all.modified_non_trans_table),
              YESNO(thd->transaction.stmt.modified_non_trans_table)));
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  if (ending_trans(thd, all) ||
      (trans_has_no_stmt_committed(thd, all) &&
       !stmt_has_updated_trans_table(thd) && stmt_has_updated_non_trans_table(thd)))
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  {
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    Query_log_event qev(thd, STRING_WITH_LEN("COMMIT"), TRUE, TRUE, 0);
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    error= binlog_end_trans(thd, trx_data, &qev, all);
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  }
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  trx_data->at_least_one_stmt_committed = my_b_tell(&trx_data->trans_log) > 0;

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  if (!all)
    trx_data->before_stmt_pos = MY_OFF_T_UNDEF; // part of the stmt commit
  DBUG_RETURN(error);
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}

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/**
  This function is called when a transaction involving a transactional
  table is rolled back.

  It has the responsibility to flush the transaction cache to the
  binlog file. However, if the transaction does not involve
  non-transactional tables, nothing needs to be logged.

  @param hton  The binlog handlerton.
  @param thd   The client thread that executes the transaction.
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  @param all   This is @c true if this is a real transaction rollback, and
               @false otherwise.
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  @see handlerton::rollback
*/
1557
static int binlog_rollback(handlerton *hton, THD *thd, bool all)
1558 1559
{
  DBUG_ENTER("binlog_rollback");
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  int error=0;
  binlog_trx_data *const trx_data=
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    (binlog_trx_data*) thd_get_ha_data(thd, binlog_hton);
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  if (trx_data->empty()) {
    trx_data->reset();
    DBUG_RETURN(0);
  }

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  DBUG_PRINT("debug", ("all: %s, all.modified_non_trans_table: %s, stmt.modified_non_trans_table: %s",
                       YESNO(all),
                       YESNO(thd->transaction.all.modified_non_trans_table),
                       YESNO(thd->transaction.stmt.modified_non_trans_table)));
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  if (mysql_bin_log.check_write_error(thd))
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  {
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    /*
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      "all == true" means that a "rollback statement" triggered the error and
      this function was called. However, this must not happen as a rollback
      is written directly to the binary log. And in auto-commit mode, a single
      statement that is rolled back has the flag all == false.
1580
    */
1581
    DBUG_ASSERT(!all);
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    /*
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      We reach this point if either only transactional tables were modified or
      the effect of a statement that did not get into the binlog needs to be
      rolled back. In the latter case, if a statement changed non-transactional
      tables or had the OPTION_KEEP_LOG associated, we write an incident event
      to the binlog in order to stop slaves and notify users that some changes
      on the master did not get into the binlog and slaves will be inconsistent.
      On the other hand, if a statement is transactional, we just safely roll it
      back.
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    */
1592
    if ((stmt_has_updated_non_trans_table(thd) ||
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        (thd->options & OPTION_KEEP_LOG)) &&
        mysql_bin_log.check_write_error(thd))
      trx_data->set_incident();
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    error= binlog_end_trans(thd, trx_data, 0, all);
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  }
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  else
  {
   /*
      We flush the cache with a rollback, wrapped in a beging/rollback if:
1602 1603
        . aborting a transaction that modified a non-transactional table or
          the OPTION_KEEP_LOG is activate.
1604
        . aborting a statement that modified both transactional and
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          non-transactional tables but which is not in the boundaries of any
          transaction or there was no early change;
1607
    */
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    if ((ending_trans(thd, all) &&
        (trans_has_updated_non_trans_table(thd) ||
         (thd->options & OPTION_KEEP_LOG))) ||
        (trans_has_no_stmt_committed(thd, all) &&
         stmt_has_updated_non_trans_table(thd) &&
         thd->current_stmt_binlog_row_based))
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    {
      Query_log_event qev(thd, STRING_WITH_LEN("ROLLBACK"), TRUE, TRUE, 0);
      error= binlog_end_trans(thd, trx_data, &qev, all);
    }
    /*
      Otherwise, we simply truncate the cache as there is no change on
      non-transactional tables as follows.
    */
1622 1623
    else if (ending_trans(thd, all) ||
             (!(thd->options & OPTION_KEEP_LOG) && !stmt_has_updated_non_trans_table(thd)))
1624 1625
      error= binlog_end_trans(thd, trx_data, 0, all);
  }
1626 1627
  if (!all)
    trx_data->before_stmt_pos = MY_OFF_T_UNDEF; // part of the stmt rollback
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  DBUG_RETURN(error);
}

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/**
  Cleanup the cache.

  @param thd   The client thread that wants to clean up the cache.
*/
void MYSQL_BIN_LOG::reset_gathered_updates(THD *thd)
{
  binlog_trx_data *const trx_data=
    (binlog_trx_data*) thd_get_ha_data(thd, binlog_hton);

  trx_data->reset();
}

1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681
void MYSQL_BIN_LOG::set_write_error(THD *thd)
{
  DBUG_ENTER("MYSQL_BIN_LOG::set_write_error");

  write_error= 1;

  if (check_write_error(thd))
    DBUG_VOID_RETURN;

  if (my_errno == EFBIG)
    my_message(ER_TRANS_CACHE_FULL, ER(ER_TRANS_CACHE_FULL), MYF(MY_WME));
  else
    my_error(ER_ERROR_ON_WRITE, MYF(MY_WME), name, errno);

  DBUG_VOID_RETURN;
}

bool MYSQL_BIN_LOG::check_write_error(THD *thd)
{
  DBUG_ENTER("MYSQL_BIN_LOG::check_write_error");

  bool checked= FALSE;

  if (!thd->is_error())
    DBUG_RETURN(checked);

  switch (thd->main_da.sql_errno())
  {
    case ER_TRANS_CACHE_FULL:
    case ER_ERROR_ON_WRITE:
    case ER_BINLOG_LOGGING_IMPOSSIBLE:
      checked= TRUE;
    break;
  }

  DBUG_RETURN(checked);
}

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/**
  @note
  How do we handle this (unlikely but legal) case:
  @verbatim
    [transaction] + [update to non-trans table] + [rollback to savepoint] ?
  @endverbatim
1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705
  The problem occurs when a savepoint is before the update to the
  non-transactional table. Then when there's a rollback to the savepoint, if we
  simply truncate the binlog cache, we lose the part of the binlog cache where
  the update is. If we want to not lose it, we need to write the SAVEPOINT
  command and the ROLLBACK TO SAVEPOINT command to the binlog cache. The latter
  is easy: it's just write at the end of the binlog cache, but the former
  should be *inserted* to the place where the user called SAVEPOINT. The
  solution is that when the user calls SAVEPOINT, we write it to the binlog
  cache (so no need to later insert it). As transactions are never intermixed
  in the binary log (i.e. they are serialized), we won't have conflicts with
  savepoint names when using mysqlbinlog or in the slave SQL thread.
  Then when ROLLBACK TO SAVEPOINT is called, if we updated some
  non-transactional table, we don't truncate the binlog cache but instead write
  ROLLBACK TO SAVEPOINT to it; otherwise we truncate the binlog cache (which
  will chop the SAVEPOINT command from the binlog cache, which is good as in
  that case there is no need to have it in the binlog).
*/

1706
static int binlog_savepoint_set(handlerton *hton, THD *thd, void *sv)
1707 1708 1709
{
  DBUG_ENTER("binlog_savepoint_set");

1710
  binlog_trans_log_savepos(thd, (my_off_t*) sv);
1711
  /* Write it to the binary log */
1712

1713 1714
  String log_query;
  if (log_query.append(STRING_WITH_LEN("SAVEPOINT ")) ||
1715 1716 1717
      log_query.append("`") ||
      log_query.append(thd->lex->ident.str, thd->lex->ident.length) ||
      log_query.append("`"))
1718
    DBUG_RETURN(1);
1719
  int errcode= query_error_code(thd, thd->killed == THD::NOT_KILLED);
1720 1721 1722
  Query_log_event qinfo(thd, log_query.c_ptr_safe(), log_query.length(),
                        TRUE, TRUE, errcode);
  DBUG_RETURN(mysql_bin_log.write(&qinfo));
1723 1724
}

1725
static int binlog_savepoint_rollback(handlerton *hton, THD *thd, void *sv)
1726 1727 1728 1729 1730 1731 1732 1733
{
  DBUG_ENTER("binlog_savepoint_rollback");

  /*
    Write ROLLBACK TO SAVEPOINT to the binlog cache if we have updated some
    non-transactional table. Otherwise, truncate the binlog cache starting
    from the SAVEPOINT command.
  */
1734
  if (unlikely(trans_has_updated_non_trans_table(thd) || 
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               (thd->options & OPTION_KEEP_LOG)))
1736
  {
1737 1738
    String log_query;
    if (log_query.append(STRING_WITH_LEN("ROLLBACK TO ")) ||
1739 1740 1741
        log_query.append("`") ||
        log_query.append(thd->lex->ident.str, thd->lex->ident.length) ||
        log_query.append("`"))
1742
      DBUG_RETURN(1);
1743
    int errcode= query_error_code(thd, thd->killed == THD::NOT_KILLED);
1744 1745 1746
    Query_log_event qinfo(thd, log_query.c_ptr_safe(), log_query.length(),
                          TRUE, TRUE, errcode);
    DBUG_RETURN(mysql_bin_log.write(&qinfo));
1747
  }
1748
  binlog_trans_log_truncate(thd, *(my_off_t*)sv);
1749 1750 1751
  DBUG_RETURN(0);
}

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int check_binlog_magic(IO_CACHE* log, const char** errmsg)
{
  char magic[4];
  DBUG_ASSERT(my_b_tell(log) == 0);

1758
  if (my_b_read(log, (uchar*) magic, sizeof(magic)))
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  {
    *errmsg = "I/O error reading the header from the binary log";
    sql_print_error("%s, errno=%d, io cache code=%d", *errmsg, my_errno,
		    log->error);
    return 1;
  }
  if (memcmp(magic, BINLOG_MAGIC, sizeof(magic)))
  {
    *errmsg = "Binlog has bad magic number;  It's not a binary log file that can be used by this version of MySQL";
    return 1;
  }
  return 0;
}

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File open_binlog(IO_CACHE *log, const char *log_file_name, const char **errmsg)
{
  File file;
  DBUG_ENTER("open_binlog");

1779 1780
  if ((file = my_open(log_file_name, O_RDONLY | O_BINARY | O_SHARE, 
                      MYF(MY_WME))) < 0)
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  {
    sql_print_error("Failed to open log (file '%s', errno %d)",
                    log_file_name, my_errno);
    *errmsg = "Could not open log file";
    goto err;
  }
  if (init_io_cache(log, file, IO_SIZE*2, READ_CACHE, 0, 0,
                    MYF(MY_WME|MY_DONT_CHECK_FILESIZE)))
  {
    sql_print_error("Failed to create a cache on log (file '%s')",
                    log_file_name);
    *errmsg = "Could not open log file";
    goto err;
  }
  if (check_binlog_magic(log,errmsg))
    goto err;
  DBUG_RETURN(file);

err:
  if (file >= 0)
  {
    my_close(file,MYF(0));
    end_io_cache(log);
  }
  DBUG_RETURN(-1);
}
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#ifdef __NT__
static int eventSource = 0;
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1811
static void setup_windows_event_source()
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{
1813
  HKEY    hRegKey= NULL;
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  DWORD   dwError= 0;
  TCHAR   szPath[MAX_PATH];
  DWORD dwTypes;
1817

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  if (eventSource)               // Ensure that we are only called once
    return;
  eventSource= 1;
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  // Create the event source registry key
1823
  dwError= RegCreateKey(HKEY_LOCAL_MACHINE,
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                          "SYSTEM\\CurrentControlSet\\Services\\EventLog\\Application\\MySQL", 
                          &hRegKey);
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  /* Name of the PE module that contains the message resource */
  GetModuleFileName(NULL, szPath, MAX_PATH);
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  /* Register EventMessageFile */
1831
  dwError = RegSetValueEx(hRegKey, "EventMessageFile", 0, REG_EXPAND_SZ,
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                          (PBYTE) szPath, (DWORD) (strlen(szPath) + 1));
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  /* Register supported event types */
  dwTypes= (EVENTLOG_ERROR_TYPE | EVENTLOG_WARNING_TYPE |
            EVENTLOG_INFORMATION_TYPE);
  dwError= RegSetValueEx(hRegKey, "TypesSupported", 0, REG_DWORD,
                         (LPBYTE) &dwTypes, sizeof dwTypes);
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  RegCloseKey(hRegKey);
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}

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#endif /* __NT__ */
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/**
  Find a unique filename for 'filename.#'.

  Set '#' to a number as low as possible.

  @return
    nonzero if not possible to get unique filename
*/
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static int find_uniq_filename(char *name)
{
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  long                  number;
  uint                  i;
  char                  buff[FN_REFLEN];
  struct st_my_dir     *dir_info;
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  reg1 struct fileinfo *file_info;
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  ulong                 max_found=0;
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  size_t		buf_length, length;
  char			*start, *end;
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  DBUG_ENTER("find_uniq_filename");

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  length= dirname_part(buff, name, &buf_length);
  start=  name + length;
  end=    strend(start);
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  *end='.';
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  length= (size_t) (end-start+1);
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  if ((DBUG_EVALUATE_IF("error_unique_log_filename", 1, 
      !(dir_info = my_dir(buff,MYF(MY_DONT_SORT))))))
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  {						// This shouldn't happen
    strmov(end,".1");				// use name+1
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    DBUG_RETURN(1);
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  }
  file_info= dir_info->dir_entry;
  for (i=dir_info->number_off_files ; i-- ; file_info++)
  {
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    if (memcmp(file_info->name, start, length) == 0 &&
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	test_if_number(file_info->name+length, &number,0))
    {
      set_if_bigger(max_found,(ulong) number);
    }
  }
  my_dirend(dir_info);

  *end++='.';
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  DBUG_RETURN((sprintf(end,"%06ld",max_found+1) < 0));
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}

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void MYSQL_LOG::init(enum_log_type log_type_arg,
1897
                     enum cache_type io_cache_type_arg)
1898 1899 1900 1901 1902 1903 1904 1905 1906
{
  DBUG_ENTER("MYSQL_LOG::init");
  log_type= log_type_arg;
  io_cache_type= io_cache_type_arg;
  DBUG_PRINT("info",("log_type: %d", log_type));
  DBUG_VOID_RETURN;
}


1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922
bool MYSQL_LOG::init_and_set_log_file_name(const char *log_name,
                                           const char *new_name,
                                           enum_log_type log_type_arg,
                                           enum cache_type io_cache_type_arg)
{
  init(log_type_arg, io_cache_type_arg);

  if (new_name && !strmov(log_file_name, new_name))
    return TRUE;
  else if (!new_name && generate_new_name(log_file_name, log_name))
    return TRUE;

  return FALSE;
}


1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960
/*
  Open a (new) log file.

  SYNOPSIS
    open()

    log_name            The name of the log to open
    log_type_arg        The type of the log. E.g. LOG_NORMAL
    new_name            The new name for the logfile. This is only needed
                        when the method is used to open the binlog file.
    io_cache_type_arg   The type of the IO_CACHE to use for this log file

  DESCRIPTION
    Open the logfile, init IO_CACHE and write startup messages
    (in case of general and slow query logs).

  RETURN VALUES
    0   ok
    1   error
*/

bool MYSQL_LOG::open(const char *log_name, enum_log_type log_type_arg,
                     const char *new_name, enum cache_type io_cache_type_arg)
{
  char buff[FN_REFLEN];
  File file= -1;
  int open_flags= O_CREAT | O_BINARY;
  DBUG_ENTER("MYSQL_LOG::open");
  DBUG_PRINT("enter", ("log_type: %d", (int) log_type_arg));

  write_error= 0;

  if (!(name= my_strdup(log_name, MYF(MY_WME))))
  {
    name= (char *)log_name; // for the error message
    goto err;
  }

1961 1962
  if (init_and_set_log_file_name(name, new_name,
                                 log_type_arg, io_cache_type_arg))
1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979
    goto err;

  if (io_cache_type == SEQ_READ_APPEND)
    open_flags |= O_RDWR | O_APPEND;
  else
    open_flags |= O_WRONLY | (log_type == LOG_BIN ? 0 : O_APPEND);

  db[0]= 0;

  if ((file= my_open(log_file_name, open_flags,
                     MYF(MY_WME | ME_WAITTANG))) < 0 ||
      init_io_cache(&log_file, file, IO_SIZE, io_cache_type,
                    my_tell(file, MYF(MY_WME)), 0,
                    MYF(MY_WME | MY_NABP |
                        ((log_type == LOG_BIN) ? MY_WAIT_IF_FULL : 0))))
    goto err;

1980
  if (log_type == LOG_NORMAL)
1981 1982
  {
    char *end;
1983
    int len=my_snprintf(buff, sizeof(buff), "%s, Version: %s (%s). "
1984
#ifdef EMBEDDED_LIBRARY
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                        "embedded library\n",
                        my_progname, server_version, MYSQL_COMPILATION_COMMENT
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#elif __NT__
			"started with:\nTCP Port: %d, Named Pipe: %s\n",
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                        my_progname, server_version, MYSQL_COMPILATION_COMMENT,
                        mysqld_port, mysqld_unix_port
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#else
			"started with:\nTcp port: %d  Unix socket: %s\n",
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                        my_progname, server_version, MYSQL_COMPILATION_COMMENT,
                        mysqld_port, mysqld_unix_port
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#endif
                       );
    end= strnmov(buff + len, "Time                 Id Command    Argument\n",
                 sizeof(buff) - len);
1999
    if (my_b_write(&log_file, (uchar*) buff, (uint) (end-buff)) ||
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	flush_io_cache(&log_file))
      goto err;
  }

2004
  log_state= LOG_OPENED;
2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015
  DBUG_RETURN(0);

err:
  sql_print_error("Could not use %s for logging (error %d). \
Turning logging off for the whole duration of the MySQL server process. \
To turn it on again: fix the cause, \
shutdown the MySQL server and restart it.", name, errno);
  if (file >= 0)
    my_close(file, MYF(0));
  end_io_cache(&log_file);
  safeFree(name);
2016
  log_state= LOG_CLOSED;
2017 2018 2019
  DBUG_RETURN(1);
}

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MYSQL_LOG::MYSQL_LOG()
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  : name(0), write_error(FALSE), inited(FALSE), log_type(LOG_UNKNOWN),
    log_state(LOG_CLOSED)
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{
  /*
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    We don't want to initialize LOCK_Log here as such initialization depends on
    safe_mutex (when using safe_mutex) which depends on MY_INIT(), which is
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    called only in main(). Doing initialization here would make it happen
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    before main().
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  */
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  bzero((char*) &log_file, sizeof(log_file));
}

void MYSQL_LOG::init_pthread_objects()
{
  DBUG_ASSERT(inited == 0);
  inited= 1;
  (void) pthread_mutex_init(&LOCK_log, MY_MUTEX_INIT_SLOW);
}

/*
  Close the log file

  SYNOPSIS
    close()
    exiting     Bitmask. For the slow and general logs the only used bit is
                LOG_CLOSE_TO_BE_OPENED. This is used if we intend to call
                open at once after close.

  NOTES
    One can do an open on the object at once after doing a close.
    The internal structures are not freed until cleanup() is called
*/

void MYSQL_LOG::close(uint exiting)
{					// One can't set log_type here!
  DBUG_ENTER("MYSQL_LOG::close");
  DBUG_PRINT("enter",("exiting: %d", (int) exiting));
2058
  if (log_state == LOG_OPENED)
2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074
  {
    end_io_cache(&log_file);

    if (my_sync(log_file.file, MYF(MY_WME)) && ! write_error)
    {
      write_error= 1;
      sql_print_error(ER(ER_ERROR_ON_WRITE), name, errno);
    }

    if (my_close(log_file.file, MYF(MY_WME)) && ! write_error)
    {
      write_error= 1;
      sql_print_error(ER(ER_ERROR_ON_WRITE), name, errno);
    }
  }

2075
  log_state= (exiting & LOG_CLOSE_TO_BE_OPENED) ? LOG_TO_BE_OPENED : LOG_CLOSED;
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  safeFree(name);
  DBUG_VOID_RETURN;
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}

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/** This is called only once. */
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void MYSQL_LOG::cleanup()
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{
2084
  DBUG_ENTER("cleanup");
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  if (inited)
2086
  {
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    inited= 0;
2088
    (void) pthread_mutex_destroy(&LOCK_log);
2089
    close(0);
2090
  }
2091
  DBUG_VOID_RETURN;
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}

2094

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int MYSQL_LOG::generate_new_name(char *new_name, const char *log_name)
2096
{
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  fn_format(new_name, log_name, mysql_data_home, "", 4);
  if (log_type == LOG_BIN)
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  {
    if (!fn_ext(log_name)[0])
    {
      if (find_uniq_filename(new_name))
      {
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        my_printf_error(ER_NO_UNIQUE_LOGFILE, ER(ER_NO_UNIQUE_LOGFILE),
                        MYF(ME_FATALERROR), log_name);
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	sql_print_error(ER(ER_NO_UNIQUE_LOGFILE), log_name);
	return 1;
      }
    }
  }
  return 0;
}

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/*
  Reopen the log file

  SYNOPSIS
    reopen_file()

  DESCRIPTION
    Reopen the log file. The method is used during FLUSH LOGS
    and locks LOCK_log mutex
*/


2127
void MYSQL_QUERY_LOG::reopen_file()
2128
{
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  char *save_name;

  DBUG_ENTER("MYSQL_LOG::reopen_file");
  if (!is_open())
  {
    DBUG_PRINT("info",("log is closed"));
    DBUG_VOID_RETURN;
  }

  pthread_mutex_lock(&LOCK_log);

  save_name= name;
  name= 0;				// Don't free name
  close(LOG_CLOSE_TO_BE_OPENED);

  /*
2145
     Note that at this point, log_state != LOG_CLOSED (important for is_open()).
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  */

2148
  open(save_name, log_type, 0, io_cache_type);
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  my_free(save_name, MYF(0));

  pthread_mutex_unlock(&LOCK_log);

2153
  DBUG_VOID_RETURN;
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}

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/*
  Write a command to traditional general log file

  SYNOPSIS
    write()

    event_time        command start timestamp
    user_host         the pointer to the string with user@host info
    user_host_len     length of the user_host string. this is computed once
                      and passed to all general log  event handlers
    thread_id         Id of the thread, issued a query
    command_type      the type of the command being logged
    command_type_len  the length of the string above
    sql_text          the very text of the query being executed
    sql_text_len      the length of sql_text string

  DESCRIPTION

   Log given command to to normal (not rotable) log file

  RETURN
    FASE - OK
    TRUE - error occured
*/

2182 2183 2184 2185
bool MYSQL_QUERY_LOG::write(time_t event_time, const char *user_host,
                            uint user_host_len, int thread_id,
                            const char *command_type, uint command_type_len,
                            const char *sql_text, uint sql_text_len)
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{
2187 2188
  char buff[32];
  uint length= 0;
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  char local_time_buff[MAX_TIME_SIZE];
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  struct tm start;
  uint time_buff_len= 0;

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  (void) pthread_mutex_lock(&LOCK_log);

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  /* Test if someone closed between the is_open test and lock */
  if (is_open())
  {
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    /* for testing output of timestamp and thread id */
    DBUG_EXECUTE_IF("reset_log_last_time", last_time= 0;);

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    /* Note that my_b_write() assumes it knows the length for this */
      if (event_time != last_time)
      {
        last_time= event_time;

        localtime_r(&event_time, &start);

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        time_buff_len= my_snprintf(local_time_buff, MAX_TIME_SIZE,
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                                   "%02d%02d%02d %2d:%02d:%02d\t",
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                                   start.tm_year % 100, start.tm_mon + 1,
                                   start.tm_mday, start.tm_hour,
                                   start.tm_min, start.tm_sec);

2214
        if (my_b_write(&log_file, (uchar*) local_time_buff, time_buff_len))
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          goto err;
      }
      else
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        if (my_b_write(&log_file, (uchar*) "\t\t" ,2) < 0)
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          goto err;

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      /* command_type, thread_id */
2222
      length= my_snprintf(buff, 32, "%5ld ", (long) thread_id);
2223

2224
    if (my_b_write(&log_file, (uchar*) buff, length))
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      goto err;

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    if (my_b_write(&log_file, (uchar*) command_type, command_type_len))
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      goto err;

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    if (my_b_write(&log_file, (uchar*) "\t", 1))
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      goto err;

    /* sql_text */
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    if (my_b_write(&log_file, (uchar*) sql_text, sql_text_len))
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      goto err;

2237
    if (my_b_write(&log_file, (uchar*) "\n", 1) ||
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        flush_io_cache(&log_file))
      goto err;
  }

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  (void) pthread_mutex_unlock(&LOCK_log);
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  return FALSE;
err:

  if (!write_error)
  {
    write_error= 1;
    sql_print_error(ER(ER_ERROR_ON_WRITE), name, errno);
  }
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  (void) pthread_mutex_unlock(&LOCK_log);
2252
  return TRUE;
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}

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/*
  Log a query to the traditional slow log file

  SYNOPSIS
    write()

    thd               THD of the query
    current_time      current timestamp
    query_start_arg   command start timestamp
    user_host         the pointer to the string with user@host info
    user_host_len     length of the user_host string. this is computed once
                      and passed to all general log event handlers
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    query_utime       Amount of time the query took to execute (in microseconds)
    lock_utime        Amount of time the query was locked (in microseconds)
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    is_command        The flag, which determines, whether the sql_text is a
                      query or an administrator command.
    sql_text          the very text of the query or administrator command
                      processed
    sql_text_len      the length of sql_text string

  DESCRIPTION

   Log a query to the slow log file.

  RETURN
    FALSE - OK
    TRUE - error occured
*/

2285 2286
bool MYSQL_QUERY_LOG::write(THD *thd, time_t current_time,
                            time_t query_start_arg, const char *user_host,
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                            uint user_host_len, ulonglong query_utime,
                            ulonglong lock_utime, bool is_command,
2289
                            const char *sql_text, uint sql_text_len)
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{
2291
  bool error= 0;
2292
  DBUG_ENTER("MYSQL_QUERY_LOG::write");
2293

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  (void) pthread_mutex_lock(&LOCK_log);

2296
  if (!is_open())
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  {
    (void) pthread_mutex_unlock(&LOCK_log);
2299
    DBUG_RETURN(0);
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  }
2301 2302 2303 2304 2305

  if (is_open())
  {						// Safety agains reopen
    int tmp_errno= 0;
    char buff[80], *end;
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    char query_time_buff[22+7], lock_time_buff[22+7];
2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324
    uint buff_len;
    end= buff;

    if (!(specialflag & SPECIAL_SHORT_LOG_FORMAT))
    {
      if (current_time != last_time)
      {
        last_time= current_time;
        struct tm start;
        localtime_r(&current_time, &start);

        buff_len= my_snprintf(buff, sizeof buff,
                              "# Time: %02d%02d%02d %2d:%02d:%02d\n",
                              start.tm_year % 100, start.tm_mon + 1,
                              start.tm_mday, start.tm_hour,
                              start.tm_min, start.tm_sec);

        /* Note that my_b_write() assumes it knows the length for this */
2325
        if (my_b_write(&log_file, (uchar*) buff, buff_len))
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          tmp_errno= errno;
      }
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      const uchar uh[]= "# User@Host: ";
      if (my_b_write(&log_file, uh, sizeof(uh) - 1))
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        tmp_errno= errno;
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      if (my_b_write(&log_file, (uchar*) user_host, user_host_len))
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        tmp_errno= errno;
2333
      if (my_b_write(&log_file, (uchar*) "\n", 1))
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        tmp_errno= errno;
    }
    /* For slow query log */
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    sprintf(query_time_buff, "%.6f", ulonglong2double(query_utime)/1000000.0);
    sprintf(lock_time_buff,  "%.6f", ulonglong2double(lock_utime)/1000000.0);
2339
    if (my_b_printf(&log_file,
2340
                    "# Query_time: %s  Lock_time: %s"
2341
                    " Rows_sent: %lu  Rows_examined: %lu\n",
2342
                    query_time_buff, lock_time_buff,
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                    (ulong) thd->sent_row_count,
                    (ulong) thd->examined_row_count) == (uint) -1)
      tmp_errno= errno;
    if (thd->db && strcmp(thd->db, db))
    {						// Database changed
      if (my_b_printf(&log_file,"use %s;\n",thd->db) == (uint) -1)
        tmp_errno= errno;
      strmov(db,thd->db);
    }
2352
    if (thd->stmt_depends_on_first_successful_insert_id_in_prev_stmt)
2353 2354
    {
      end=strmov(end, ",last_insert_id=");
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      end=longlong10_to_str((longlong)
                            thd->first_successful_insert_id_in_prev_stmt_for_binlog,
                            end, -10);
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    }
    // Save value if we do an insert.
2360
    if (thd->auto_inc_intervals_in_cur_stmt_for_binlog.nb_elements() > 0)
2361 2362 2363 2364
    {
      if (!(specialflag & SPECIAL_SHORT_LOG_FORMAT))
      {
        end=strmov(end,",insert_id=");
2365 2366 2367
        end=longlong10_to_str((longlong)
                              thd->auto_inc_intervals_in_cur_stmt_for_binlog.minimum(),
                              end, -10);
2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382
      }
    }

    /*
      This info used to show up randomly, depending on whether the query
      checked the query start time or not. now we always write current
      timestamp to the slow log
    */
    end= strmov(end, ",timestamp=");
    end= int10_to_str((long) current_time, end, 10);

    if (end != buff)
    {
      *end++=';';
      *end='\n';
2383 2384
      if (my_b_write(&log_file, (uchar*) "SET ", 4) ||
          my_b_write(&log_file, (uchar*) buff + 1, (uint) (end-buff)))
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        tmp_errno= errno;
    }
    if (is_command)
    {
      end= strxmov(buff, "# administrator command: ", NullS);
      buff_len= (ulong) (end - buff);
2391
      my_b_write(&log_file, (uchar*) buff, buff_len);
2392
    }
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    if (my_b_write(&log_file, (uchar*) sql_text, sql_text_len) ||
        my_b_write(&log_file, (uchar*) ";\n",2) ||
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        flush_io_cache(&log_file))
      tmp_errno= errno;
    if (tmp_errno)
    {
      error= 1;
      if (! write_error)
      {
        write_error= 1;
        sql_print_error(ER(ER_ERROR_ON_WRITE), name, error);
      }
    }
  }
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  (void) pthread_mutex_unlock(&LOCK_log);
2408
  DBUG_RETURN(error);
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}

2411

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/**
  @todo
  The following should be using fn_format();  We just need to
  first change fn_format() to cut the file name if it's too long.
*/
2417
const char *MYSQL_LOG::generate_name(const char *log_name,
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                                      const char *suffix,
                                      bool strip_ext, char *buff)
2420 2421 2422
{
  if (!log_name || !log_name[0])
  {
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    strmake(buff, pidfile_name, FN_REFLEN - strlen(suffix) - 1);
    return (const char *)
      fn_format(buff, buff, "", suffix, MYF(MY_REPLACE_EXT|MY_REPLACE_DIR));
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  }
  // get rid of extension if the log is binary to avoid problems
  if (strip_ext)
  {
2430 2431
    char *p= fn_ext(log_name);
    uint length= (uint) (p - log_name);
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    strmake(buff, log_name, min(length, FN_REFLEN-1));
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    return (const char*)buff;
  }
  return log_name;
}

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2439

2440 2441
MYSQL_BIN_LOG::MYSQL_BIN_LOG()
  :bytes_written(0), prepared_xids(0), file_id(1), open_count(1),
2442
   need_start_event(TRUE),
2443
   is_relay_log(0),
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   description_event_for_exec(0), description_event_for_queue(0)
{
  /*
    We don't want to initialize locks here as such initialization depends on
    safe_mutex (when using safe_mutex) which depends on MY_INIT(), which is
    called only in main(). Doing initialization here would make it happen
    before main().
  */
  index_file_name[0] = 0;
  bzero((char*) &index_file, sizeof(index_file));
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  bzero((char*) &purge_index_file, sizeof(purge_index_file));
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}

/* this is called only once */

void MYSQL_BIN_LOG::cleanup()
{
  DBUG_ENTER("cleanup");
  if (inited)
  {
    inited= 0;
    close(LOG_CLOSE_INDEX|LOG_CLOSE_STOP_EVENT);
    delete description_event_for_queue;
    delete description_event_for_exec;
    (void) pthread_mutex_destroy(&LOCK_log);
    (void) pthread_mutex_destroy(&LOCK_index);
    (void) pthread_cond_destroy(&update_cond);
  }
  DBUG_VOID_RETURN;
}


/* Init binlog-specific vars */
void MYSQL_BIN_LOG::init(bool no_auto_events_arg, ulong max_size_arg)
{
  DBUG_ENTER("MYSQL_BIN_LOG::init");
  no_auto_events= no_auto_events_arg;
  max_size= max_size_arg;
  DBUG_PRINT("info",("max_size: %lu", max_size));
  DBUG_VOID_RETURN;
}


void MYSQL_BIN_LOG::init_pthread_objects()
{
  DBUG_ASSERT(inited == 0);
  inited= 1;
  (void) pthread_mutex_init(&LOCK_log, MY_MUTEX_INIT_SLOW);
  (void) pthread_mutex_init(&LOCK_index, MY_MUTEX_INIT_SLOW);
  (void) pthread_cond_init(&update_cond, 0);
}


bool MYSQL_BIN_LOG::open_index_file(const char *index_file_name_arg,
2498
                                    const char *log_name, bool need_mutex)
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{
  File index_file_nr= -1;
  DBUG_ASSERT(!my_b_inited(&index_file));

  /*
    First open of this class instance
    Create an index file that will hold all file names uses for logging.
    Add new entries to the end of it.
  */
  myf opt= MY_UNPACK_FILENAME;
  if (!index_file_name_arg)
  {
    index_file_name_arg= log_name;    // Use same basename for index file
    opt= MY_UNPACK_FILENAME | MY_REPLACE_EXT;
  }
  fn_format(index_file_name, index_file_name_arg, mysql_data_home,
            ".index", opt);
  if ((index_file_nr= my_open(index_file_name,
                              O_RDWR | O_CREAT | O_BINARY ,
                              MYF(MY_WME))) < 0 ||
       my_sync(index_file_nr, MYF(MY_WME)) ||
       init_io_cache(&index_file, index_file_nr,
                     IO_SIZE, WRITE_CACHE,
                     my_seek(index_file_nr,0L,MY_SEEK_END,MYF(0)),
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			0, MYF(MY_WME | MY_WAIT_IF_FULL)) ||
      DBUG_EVALUATE_IF("fault_injection_openning_index", 1, 0))
2525
  {
2526 2527 2528 2529 2530
    /*
      TODO: all operations creating/deleting the index file or a log, should
      call my_sync_dir() or my_sync_dir_by_file() to be durable.
      TODO: file creation should be done with my_create() not my_open().
    */
2531 2532 2533 2534
    if (index_file_nr >= 0)
      my_close(index_file_nr,MYF(0));
    return TRUE;
  }
2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556

#ifdef HAVE_REPLICATION
  /*
    Sync the index by purging any binary log file that is not registered.
    In other words, either purge binary log files that were removed from
    the index but not purged from the file system due to a crash or purge
    any binary log file that was created but not register in the index
    due to a crash.
  */

  if (set_purge_index_file_name(index_file_name_arg) ||
      open_purge_index_file(FALSE) ||
      purge_index_entry(NULL, NULL, need_mutex) ||
      close_purge_index_file() ||
      DBUG_EVALUATE_IF("fault_injection_recovering_index", 1, 0))
  {
    sql_print_error("MYSQL_BIN_LOG::open_index_file failed to sync the index "
                    "file.");
    return TRUE;
  }
#endif

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  return FALSE;
}

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/**
2562
  Open a (new) binlog file.
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2564
  - Open the log file and the index file. Register the new
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  file name in it
2566
  - When calling this when the file is in use, you must have a locks
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  on LOCK_log and LOCK_index.
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  @retval
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    0	ok
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  @retval
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    1	error
*/

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bool MYSQL_BIN_LOG::open(const char *log_name,
                         enum_log_type log_type_arg,
                         const char *new_name,
                         enum cache_type io_cache_type_arg,
                         bool no_auto_events_arg,
                         ulong max_size_arg,
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                         bool null_created_arg,
                         bool need_mutex)
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{
2584
  File file= -1;
2585

2586
  DBUG_ENTER("MYSQL_BIN_LOG::open");
2587
  DBUG_PRINT("enter",("log_type: %d",(int) log_type_arg));
2588

2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604
  if (init_and_set_log_file_name(log_name, new_name, log_type_arg,
                                 io_cache_type_arg))
  {
    sql_print_error("MSYQL_BIN_LOG::open failed to generate new file name.");
    DBUG_RETURN(1);
  }

#ifdef HAVE_REPLICATION
  if (open_purge_index_file(TRUE) ||
      register_create_index_entry(log_file_name) ||
      sync_purge_index_file() ||
      DBUG_EVALUATE_IF("fault_injection_registering_index", 1, 0))
  {
    sql_print_error("MSYQL_BIN_LOG::open failed to sync the index file.");
    DBUG_RETURN(1);
  }
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  DBUG_EXECUTE_IF("crash_create_non_critical_before_update_index", DBUG_SUICIDE(););
2606 2607 2608
#endif

  write_error= 0;
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  /* open the main log file */
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  if (MYSQL_LOG::open(log_name, log_type_arg, new_name,
                      io_cache_type_arg))
  {
#ifdef HAVE_REPLICATION
    close_purge_index_file();
#endif
2617
    DBUG_RETURN(1);                            /* all warnings issued */
2618
  }
2619

2620
  init(no_auto_events_arg, max_size_arg);
2621

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  open_count++;
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2624
  DBUG_ASSERT(log_type == LOG_BIN);
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  {
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    bool write_file_name_to_index_file=0;

    if (!my_b_filelength(&log_file))
    {
      /*
	The binary log file was empty (probably newly created)
	This is the normal case and happens when the user doesn't specify
	an extension for the binary log files.
	In this case we write a standard header to it.
      */
2637
      if (my_b_safe_write(&log_file, (uchar*) BINLOG_MAGIC,
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			  BIN_LOG_HEADER_SIZE))
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        goto err;
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      bytes_written+= BIN_LOG_HEADER_SIZE;
      write_file_name_to_index_file= 1;
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    }
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    if (need_start_event && !no_auto_events)
2645
    {
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      /*
        In 4.x we set need_start_event=0 here, but in 5.0 we want a Start event
        even if this is not the very first binlog.
      */
      Format_description_log_event s(BINLOG_VERSION);
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      /*
        don't set LOG_EVENT_BINLOG_IN_USE_F for SEQ_READ_APPEND io_cache
        as we won't be able to reset it later
      */
      if (io_cache_type == WRITE_CACHE)
        s.flags|= LOG_EVENT_BINLOG_IN_USE_F;
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      if (!s.is_valid())
        goto err;
2659
      s.dont_set_created= null_created_arg;
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      if (s.write(&log_file))
        goto err;
      bytes_written+= s.data_written;
    }
    if (description_event_for_queue &&
        description_event_for_queue->binlog_version>=4)
    {
      /*
        This is a relay log written to by the I/O slave thread.
        Write the event so that others can later know the format of this relay
        log.
        Note that this event is very close to the original event from the
        master (it has binlog version of the master, event types of the
        master), so this is suitable to parse the next relay log's event. It
        has been produced by
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        Format_description_log_event::Format_description_log_event(char* buf,).
2676 2677 2678 2679 2680 2681 2682 2683 2684
        Why don't we want to write the description_event_for_queue if this
        event is for format<4 (3.23 or 4.x): this is because in that case, the
        description_event_for_queue describes the data received from the
        master, but not the data written to the relay log (*conversion*),
        which is in format 4 (slave's).
      */
      /*
        Set 'created' to 0, so that in next relay logs this event does not
        trigger cleaning actions on the slave in
2685
        Format_description_log_event::apply_event_impl().
2686 2687 2688
      */
      description_event_for_queue->created= 0;
      /* Don't set log_pos in event header */
2689
      description_event_for_queue->set_artificial_event();
2690

2691 2692 2693
      if (description_event_for_queue->write(&log_file))
        goto err;
      bytes_written+= description_event_for_queue->data_written;
2694
    }
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    if (flush_io_cache(&log_file) ||
        my_sync(log_file.file, MYF(MY_WME)))
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      goto err;
2698 2699 2700

    if (write_file_name_to_index_file)
    {
2701
#ifdef HAVE_REPLICATION
2702
      DBUG_EXECUTE_IF("crash_create_critical_before_update_index", DBUG_SUICIDE(););
2703 2704 2705 2706 2707
#endif

      DBUG_ASSERT(my_b_inited(&index_file) != 0);
      reinit_io_cache(&index_file, WRITE_CACHE,
                      my_b_filelength(&index_file), 0, 0);
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      /*
        As this is a new log file, we write the file name to the index
        file. As every time we write to the index file, we sync it.
      */
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      if (DBUG_EVALUATE_IF("fault_injection_updating_index", 1, 0) ||
          my_b_write(&index_file, (uchar*) log_file_name,
                     strlen(log_file_name)) ||
          my_b_write(&index_file, (uchar*) "\n", 1) ||
          flush_io_cache(&index_file) ||
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          my_sync(index_file.file, MYF(MY_WME)))
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        goto err;

#ifdef HAVE_REPLICATION
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      DBUG_EXECUTE_IF("crash_create_after_update_index", DBUG_SUICIDE(););
2722
#endif
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    }
2724
  }
2725 2726
  log_state= LOG_OPENED;

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#ifdef HAVE_REPLICATION
  close_purge_index_file();
#endif

2731
  DBUG_RETURN(0);
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err:
2734 2735 2736 2737 2738
#ifdef HAVE_REPLICATION
  if (is_inited_purge_index_file())
    purge_index_entry(NULL, NULL, need_mutex);
  close_purge_index_file();
#endif
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  sql_print_error("Could not use %s for logging (error %d). \
Turning logging off for the whole duration of the MySQL server process. \
To turn it on again: fix the cause, \
2742
shutdown the MySQL server and restart it.", name, errno);
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  if (file >= 0)
    my_close(file,MYF(0));
  end_io_cache(&log_file);
2746 2747
  end_io_cache(&index_file);
  safeFree(name);
2748
  log_state= LOG_CLOSED;
2749
  DBUG_RETURN(1);
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}

2752

2753
int MYSQL_BIN_LOG::get_current_log(LOG_INFO* linfo)
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{
  pthread_mutex_lock(&LOCK_log);
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  int ret = raw_get_current_log(linfo);
  pthread_mutex_unlock(&LOCK_log);
  return ret;
}

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int MYSQL_BIN_LOG::raw_get_current_log(LOG_INFO* linfo)
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{
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  strmake(linfo->log_file_name, log_file_name, sizeof(linfo->log_file_name)-1);
  linfo->pos = my_b_tell(&log_file);
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  return 0;
}

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/**
  Move all data up in a file in an filename index file.
2770 2771 2772 2773 2774

    We do the copy outside of the IO_CACHE as the cache buffers would just
    make things slower and more complicated.
    In most cases the copy loop should only do one read.

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  @param index_file			File to move
  @param offset			Move everything from here to beginning

  @note
    File will be truncated to be 'offset' shorter or filled up with newlines

  @retval
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    0	ok
*/

2785 2786
#ifdef HAVE_REPLICATION

2787 2788 2789 2790 2791
static bool copy_up_file_and_fill(IO_CACHE *index_file, my_off_t offset)
{
  int bytes_read;
  my_off_t init_offset= offset;
  File file= index_file->file;
2792
  uchar io_buf[IO_SIZE*2];
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  DBUG_ENTER("copy_up_file_and_fill");

  for (;; offset+= bytes_read)
  {
    (void) my_seek(file, offset, MY_SEEK_SET, MYF(0));
    if ((bytes_read= (int) my_read(file, io_buf, sizeof(io_buf), MYF(MY_WME)))
	< 0)
      goto err;
    if (!bytes_read)
      break;					// end of file
    (void) my_seek(file, offset-init_offset, MY_SEEK_SET, MYF(0));
2804
    if (my_write(file, io_buf, bytes_read, MYF(MY_WME | MY_NABP)))
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      goto err;
  }
  /* The following will either truncate the file or fill the end with \n' */
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  if (my_chsize(file, offset - init_offset, '\n', MYF(MY_WME)) ||
      my_sync(file, MYF(MY_WME)))
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    goto err;

  /* Reset data in old index cache */
  reinit_io_cache(index_file, READ_CACHE, (my_off_t) 0, 0, 1);
  DBUG_RETURN(0);

err:
  DBUG_RETURN(1);
}

2820
#endif /* HAVE_REPLICATION */
2821

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/**
  Find the position in the log-index-file for the given log name.
2824

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  @param linfo		Store here the found log file name and position to
                       the NEXT log file name in the index file.
  @param log_name	Filename to find in the index file.
                       Is a null pointer if we want to read the first entry
  @param need_lock	Set this to 1 if the parent doesn't already have a
                       lock on LOCK_index
2831

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  @note
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2833 2834
    On systems without the truncate function the file will end with one or
    more empty lines.  These will be ignored when reading the file.
2835

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  @retval
2837
    0			ok
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  @retval
    LOG_INFO_EOF	        End of log-index-file found
  @retval
2841 2842 2843
    LOG_INFO_IO		Got IO error while reading file
*/

2844
int MYSQL_BIN_LOG::find_log_pos(LOG_INFO *linfo, const char *log_name,
2845
			    bool need_lock)
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{
2847 2848 2849 2850 2851
  int error= 0;
  char *fname= linfo->log_file_name;
  uint log_name_len= log_name ? (uint) strlen(log_name) : 0;
  DBUG_ENTER("find_log_pos");
  DBUG_PRINT("enter",("log_name: %s", log_name ? log_name : "NULL"));
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  /*
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    Mutex needed because we need to make sure the file pointer does not
    move from under our feet
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  */
2857
  if (need_lock)
2858
    pthread_mutex_lock(&LOCK_index);
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  safe_mutex_assert_owner(&LOCK_index);

  /* As the file is flushed, we can't get an error here */
  (void) reinit_io_cache(&index_file, READ_CACHE, (my_off_t) 0, 0, 0);

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  for (;;)
2865
  {
2866
    uint length;
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    my_off_t offset= my_b_tell(&index_file);
    /* If we get 0 or 1 characters, this is the end of the file */

    if ((length= my_b_gets(&index_file, fname, FN_REFLEN)) <= 1)
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    {
2872 2873 2874
      /* Did not find the given entry; Return not found or error */
      error= !index_file.error ? LOG_INFO_EOF : LOG_INFO_IO;
      break;
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    }

2877 2878
    // if the log entry matches, null string matching anything
    if (!log_name ||
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	(log_name_len == length-1 && fname[log_name_len] == '\n' &&
2880
	 !memcmp(fname, log_name, log_name_len)))
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    {
2882
      DBUG_PRINT("info",("Found log file entry"));
2883
      fname[length-1]=0;			// remove last \n
2884 2885
      linfo->index_file_start_offset= offset;
      linfo->index_file_offset = my_b_tell(&index_file);
2886
      break;
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    }
2888
  }
2889

2890
  if (need_lock)
2891
    pthread_mutex_unlock(&LOCK_index);
2892
  DBUG_RETURN(error);
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}
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2894

2895

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/**
  Find the position in the log-index-file for the given log name.
2898

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  @param
2900 2901
    linfo		Store here the next log file name and position to
			the file name after that.
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  @param
2903 2904 2905
    need_lock		Set this to 1 if the parent doesn't already have a
			lock on LOCK_index

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  @note
2907
    - Before calling this function, one has to call find_log_pos()
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    to set up 'linfo'
2909
    - Mutex needed because we need to make sure the file pointer does not move
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    from under our feet
2911

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  @retval
2913
    0			ok
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  @retval
    LOG_INFO_EOF	        End of log-index-file found
  @retval
2917 2918 2919
    LOG_INFO_IO		Got IO error while reading file
*/

2920
int MYSQL_BIN_LOG::find_next_log(LOG_INFO* linfo, bool need_lock)
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{
2922
  int error= 0;
2923
  uint length;
2924 2925
  char *fname= linfo->log_file_name;

2926 2927
  if (need_lock)
    pthread_mutex_lock(&LOCK_index);
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  safe_mutex_assert_owner(&LOCK_index);

  /* As the file is flushed, we can't get an error here */
  (void) reinit_io_cache(&index_file, READ_CACHE, linfo->index_file_offset, 0,
			 0);

  linfo->index_file_start_offset= linfo->index_file_offset;
  if ((length=my_b_gets(&index_file, fname, FN_REFLEN)) <= 1)
2936
  {
2937
    error = !index_file.error ? LOG_INFO_EOF : LOG_INFO_IO;
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    goto err;
  }
2940
  fname[length-1]=0;				// kill \n
2941
  linfo->index_file_offset = my_b_tell(&index_file);
2942

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err:
2944 2945
  if (need_lock)
    pthread_mutex_unlock(&LOCK_index);
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  return error;
}

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/**
  Delete all logs refered to in the index file.
  Start writing to a new log file.
2953

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  The new index file will only contain this file.
2955

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  @param thd		Thread
2957

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  @note
    If not called from slave thread, write start event to new log
2960

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  @retval
2962
    0	ok
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  @retval
2964 2965 2966
    1   error
*/

2967
bool MYSQL_BIN_LOG::reset_logs(THD* thd)
2968 2969
{
  LOG_INFO linfo;
2970
  bool error=0;
2971
  const char* save_name;
2972
  DBUG_ENTER("reset_logs");
2973

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  ha_reset_logs(thd);
2975 2976 2977 2978
  /*
    We need to get both locks to be sure that no one is trying to
    write to the index log file.
  */
2979
  pthread_mutex_lock(&LOCK_log);
2980
  pthread_mutex_lock(&LOCK_index);
2981

2982 2983 2984 2985 2986 2987
  /*
    The following mutex is needed to ensure that no threads call
    'delete thd' as we would then risk missing a 'rollback' from this
    thread. If the transaction involved MyISAM tables, it should go
    into binlog even on rollback.
  */
2988
  VOID(pthread_mutex_lock(&LOCK_thread_count));
2989 2990 2991 2992

  /* Save variables so that we can reopen the log */
  save_name=name;
  name=0;					// Protect against free
2993
  close(LOG_CLOSE_TO_BE_OPENED);
2994

2995 2996 2997 2998 2999
  /*
    First delete all old log files and then update the index file.
    As we first delete the log files and do not use sort of logging,
    a crash may lead to an inconsistent state where the index has
    references to non-existent files.
3000

3001 3002 3003
    We need to invert the steps and use the purge_index_file methods
    in order to make the operation safe.
  */
3004
  if (find_log_pos(&linfo, NullS, 0))
3005 3006 3007 3008
  {
    error=1;
    goto err;
  }
3009

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  for (;;)
3011
  {
3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025
    if ((error= my_delete_allow_opened(linfo.log_file_name, MYF(0))) != 0)
    {
      if (my_errno == ENOENT) 
      {
        push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                            ER_LOG_PURGE_NO_FILE, ER(ER_LOG_PURGE_NO_FILE),
                            linfo.log_file_name);
        sql_print_information("Failed to delete file '%s'",
                              linfo.log_file_name);
        my_errno= 0;
        error= 0;
      }
      else
      {
3026
        push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
3027 3028 3029 3030 3031 3032 3033 3034 3035 3036
                            ER_BINLOG_PURGE_FATAL_ERR,
                            "a problem with deleting %s; "
                            "consider examining correspondence "
                            "of your binlog index file "
                            "to the actual binlog files",
                            linfo.log_file_name);
        error= 1;
        goto err;
      }
    }
3037
    if (find_next_log(&linfo, 0))
3038 3039
      break;
  }
3040 3041

  /* Start logging with a new file */
3042
  close(LOG_CLOSE_INDEX | LOG_CLOSE_TO_BE_OPENED);
3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056
  if ((error= my_delete_allow_opened(index_file_name, MYF(0))))	// Reset (open will update)
  {
    if (my_errno == ENOENT) 
    {
      push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                          ER_LOG_PURGE_NO_FILE, ER(ER_LOG_PURGE_NO_FILE),
                          index_file_name);
      sql_print_information("Failed to delete file '%s'",
                            index_file_name);
      my_errno= 0;
      error= 0;
    }
    else
    {
3057
      push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
3058 3059 3060 3061 3062 3063 3064 3065 3066 3067
                          ER_BINLOG_PURGE_FATAL_ERR,
                          "a problem with deleting %s; "
                          "consider examining correspondence "
                          "of your binlog index file "
                          "to the actual binlog files",
                          index_file_name);
      error= 1;
      goto err;
    }
  }
3068
  if (!thd->slave_thread)
3069
    need_start_event=1;
3070
  if (!open_index_file(index_file_name, 0, FALSE))
3071 3072
    if ((error= open(save_name, log_type, 0, io_cache_type, no_auto_events, max_size, 0, FALSE)))
      goto err;
3073
  my_free((uchar*) save_name, MYF(0));
3074

3075
err:
3076
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
3077
  pthread_mutex_unlock(&LOCK_index);
3078
  pthread_mutex_unlock(&LOCK_log);
3079
  DBUG_RETURN(error);
3080 3081
}

unknown's avatar
unknown committed
3082

unknown's avatar
unknown committed
3083
/**
3084 3085
  Delete relay log files prior to rli->group_relay_log_name
  (i.e. all logs which are not involved in a non-finished group
unknown's avatar
unknown committed
3086 3087
  (transaction)), remove them from the index file and start on next
  relay log.
3088

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unknown committed
3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102
  IMPLEMENTATION
  - Protects index file with LOCK_index
  - Delete relevant relay log files
  - Copy all file names after these ones to the front of the index file
  - If the OS has truncate, truncate the file, else fill it with \n'
  - Read the next file name from the index file and store in rli->linfo

  @param rli	       Relay log information
  @param included     If false, all relay logs that are strictly before
                      rli->group_relay_log_name are deleted ; if true, the
                      latter is deleted too (i.e. all relay logs
                      read by the SQL slave thread are deleted).

  @note
3103
    - This is only called from the slave-execute thread when it has read
unknown's avatar
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3104
    all commands from a relay log and want to switch to a new relay log.
3105
    - When this happens, we can be in an active transaction as
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3106 3107 3108
    a transaction can span over two relay logs
    (although it is always written as a single block to the master's binary
    log, hence cannot span over two master's binary logs).
3109

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unknown committed
3110
  @retval
3111
    0			ok
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3112 3113 3114
  @retval
    LOG_INFO_EOF	        End of log-index-file found
  @retval
3115
    LOG_INFO_SEEK	Could not allocate IO cache
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3116
  @retval
3117
    LOG_INFO_IO		Got IO error while reading file
3118 3119
*/

unknown's avatar
SCRUM  
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3120
#ifdef HAVE_REPLICATION
3121

3122
int MYSQL_BIN_LOG::purge_first_log(Relay_log_info* rli, bool included)
3123
{
3124
  int error;
3125
  char *to_purge_if_included= NULL;
3126 3127
  DBUG_ENTER("purge_first_log");

3128 3129
  DBUG_ASSERT(is_open());
  DBUG_ASSERT(rli->slave_running == 1);
3130
  DBUG_ASSERT(!strcmp(rli->linfo.log_file_name,rli->event_relay_log_name));
3131

3132
  pthread_mutex_lock(&LOCK_index);
3133
  to_purge_if_included= my_strdup(rli->group_relay_log_name, MYF(0));
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3134

3135 3136
  /*
    Read the next log file name from the index file and pass it back to
3137
    the caller.
3138
  */
3139 3140
  if((error=find_log_pos(&rli->linfo, rli->event_relay_log_name, 0)) || 
     (error=find_next_log(&rli->linfo, 0)))
3141 3142
  {
    char buff[22];
3143 3144 3145
    sql_print_error("next log error: %d  offset: %s  log: %s included: %d",
                    error,
                    llstr(rli->linfo.index_file_offset,buff),
3146
                    rli->event_relay_log_name,
3147
                    included);
3148 3149
    goto err;
  }
3150

3151
  /*
3152
    Reset rli's coordinates to the current log.
3153
  */
3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167
  rli->event_relay_log_pos= BIN_LOG_HEADER_SIZE;
  strmake(rli->event_relay_log_name,rli->linfo.log_file_name,
	  sizeof(rli->event_relay_log_name)-1);

  /*
    If we removed the rli->group_relay_log_name file,
    we must update the rli->group* coordinates, otherwise do not touch it as the
    group's execution is not finished (e.g. COMMIT not executed)
  */
  if (included)
  {
    rli->group_relay_log_pos = BIN_LOG_HEADER_SIZE;
    strmake(rli->group_relay_log_name,rli->linfo.log_file_name,
            sizeof(rli->group_relay_log_name)-1);
3168
    rli->notify_group_relay_log_name_update();
3169
  }
3170 3171 3172

  /* Store where we are in the new file for the execution thread */
  flush_relay_log_info(rli);
unknown's avatar
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3173

3174
  DBUG_EXECUTE_IF("crash_before_purge_logs", DBUG_SUICIDE(););
3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193

  pthread_mutex_lock(&rli->log_space_lock);
  rli->relay_log.purge_logs(to_purge_if_included, included,
                            0, 0, &rli->log_space_total);
  // Tell the I/O thread to take the relay_log_space_limit into account
  rli->ignore_log_space_limit= 0;
  pthread_mutex_unlock(&rli->log_space_lock);

  /*
    Ok to broadcast after the critical region as there is no risk of
    the mutex being destroyed by this thread later - this helps save
    context switches
  */
  pthread_cond_broadcast(&rli->log_space_cond);

  /*
   * Need to update the log pos because purge logs has been called 
   * after fetching initially the log pos at the begining of the method.
   */
3194
  if((error=find_log_pos(&rli->linfo, rli->event_relay_log_name, 0)))
3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207
  {
    char buff[22];
    sql_print_error("next log error: %d  offset: %s  log: %s included: %d",
                    error,
                    llstr(rli->linfo.index_file_offset,buff),
                    rli->group_relay_log_name,
                    included);
    goto err;
  }

  /* If included was passed, rli->linfo should be the first entry. */
  DBUG_ASSERT(!included || rli->linfo.index_file_start_offset == 0);

3208
err:
3209
  my_free(to_purge_if_included, MYF(0));
3210
  pthread_mutex_unlock(&LOCK_index);
3211
  DBUG_RETURN(error);
3212 3213
}

unknown's avatar
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3214 3215
/**
  Update log index_file.
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3216 3217
*/

3218
int MYSQL_BIN_LOG::update_log_index(LOG_INFO* log_info, bool need_update_threads)
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3219 3220 3221 3222 3223
{
  if (copy_up_file_and_fill(&index_file, log_info->index_file_start_offset))
    return LOG_INFO_IO;

  // now update offsets in index file for running threads
3224 3225
  if (need_update_threads)
    adjust_linfo_offsets(log_info->index_file_start_offset);
unknown's avatar
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3226 3227
  return 0;
}
unknown's avatar
unknown committed
3228

unknown's avatar
unknown committed
3229
/**
3230 3231
  Remove all logs before the given log from disk and from the index file.

unknown's avatar
unknown committed
3232 3233 3234 3235 3236 3237 3238
  @param to_log	      Delete all log file name before this file.
  @param included            If true, to_log is deleted too.
  @param need_mutex
  @param need_update_threads If we want to update the log coordinates of
                             all threads. False for relay logs, true otherwise.
  @param freed_log_space     If not null, decrement this variable of
                             the amount of log space freed
3239

unknown's avatar
unknown committed
3240
  @note
3241 3242 3243
    If any of the logs before the deleted one is in use,
    only purge logs up to this one.

unknown's avatar
unknown committed
3244 3245 3246
  @retval
    0			ok
  @retval
3247
    LOG_INFO_EOF		to_log not found
3248
    LOG_INFO_EMFILE             too many files opened
3249 3250
    LOG_INFO_FATAL              if any other than ENOENT error from
                                my_stat() or my_delete()
3251 3252
*/

3253
int MYSQL_BIN_LOG::purge_logs(const char *to_log, 
3254 3255 3256 3257
                          bool included,
                          bool need_mutex, 
                          bool need_update_threads, 
                          ulonglong *decrease_log_space)
unknown's avatar
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3258
{
3259
  int error= 0;
3260
  bool exit_loop= 0;
3261
  LOG_INFO log_info;
3262
  THD *thd= current_thd;
3263
  DBUG_ENTER("purge_logs");
3264
  DBUG_PRINT("info",("to_log= %s",to_log));
3265

3266 3267
  if (need_mutex)
    pthread_mutex_lock(&LOCK_index);
3268 3269
  if ((error=find_log_pos(&log_info, to_log, 0 /*no mutex*/))) 
  {
3270
    sql_print_error("MYSQL_BIN_LOG::purge_logs was called with file %s not "
3271
                    "listed in the index.", to_log);
3272
    goto err;
3273 3274
  }

3275
  if ((error= open_purge_index_file(TRUE)))
3276
  {
3277 3278
    sql_print_error("MYSQL_BIN_LOG::purge_logs failed to sync the index file.");
    goto err;
3279
  }
3280

3281
  /*
3282
    File name exists in index file; delete until we find this file
3283 3284 3285
    or a file that is used.
  */
  if ((error=find_log_pos(&log_info, NullS, 0 /*no mutex*/)))
3286
    goto err;
3287
  while ((strcmp(to_log,log_info.log_file_name) || (exit_loop=included)) &&
3288
         !is_active(log_info.log_file_name) &&
3289
         !log_in_use(log_info.log_file_name))
3290
  {
3291
    if ((error= register_purge_index_entry(log_info.log_file_name)))
3292
    {
3293
      sql_print_error("MYSQL_BIN_LOG::purge_logs failed to copy %s to register file.",
3294 3295 3296 3297 3298 3299
                      log_info.log_file_name);
      goto err;
    }

    if (find_next_log(&log_info, 0) || exit_loop)
      break;
3300 3301
  }

3302
  DBUG_EXECUTE_IF("crash_purge_before_update_index", DBUG_SUICIDE(););
3303 3304 3305 3306 3307 3308

  if ((error= sync_purge_index_file()))
  {
    sql_print_error("MSYQL_BIN_LOG::purge_logs failed to flush register file.");
    goto err;
  }
3309 3310

  /* We know how many files to delete. Update index file. */
3311
  if ((error=update_log_index(&log_info, need_update_threads)))
3312
  {
3313
    sql_print_error("MSYQL_BIN_LOG::purge_logs failed to update the index file");
3314 3315 3316
    goto err;
  }

3317
  DBUG_EXECUTE_IF("crash_purge_critical_after_update_index", DBUG_SUICIDE(););
3318 3319 3320 3321 3322 3323 3324 3325 3326

err:
  /* Read each entry from purge_index_file and delete the file. */
  if (is_inited_purge_index_file() &&
      (error= purge_index_entry(thd, decrease_log_space, FALSE)))
    sql_print_error("MSYQL_BIN_LOG::purge_logs failed to process registered files"
                    " that would be purged.");
  close_purge_index_file();

3327
  DBUG_EXECUTE_IF("crash_purge_non_critical_after_update_index", DBUG_SUICIDE(););
3328 3329 3330 3331 3332

  if (need_mutex)
    pthread_mutex_unlock(&LOCK_index);
  DBUG_RETURN(error);
}
3333

3334 3335 3336 3337 3338 3339 3340
int MYSQL_BIN_LOG::set_purge_index_file_name(const char *base_file_name)
{
  int error= 0;
  DBUG_ENTER("MYSQL_BIN_LOG::set_purge_index_file_name");
  if (fn_format(purge_index_file_name, base_file_name, mysql_data_home,
                ".~rec~", MYF(MY_UNPACK_FILENAME | MY_SAFE_PATH |
                              MY_REPLACE_EXT)) == NULL)
3341
  {
3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442
    error= 1;
    sql_print_error("MYSQL_BIN_LOG::set_purge_index_file_name failed to set "
                      "file name.");
  }
  DBUG_RETURN(error);
}

int MYSQL_BIN_LOG::open_purge_index_file(bool destroy)
{
  int error= 0;
  File file= -1;

  DBUG_ENTER("MYSQL_BIN_LOG::open_purge_index_file");

  if (destroy)
    close_purge_index_file();

  if (!my_b_inited(&purge_index_file))
  {
    if ((file= my_open(purge_index_file_name, O_RDWR | O_CREAT | O_BINARY,
                       MYF(MY_WME | ME_WAITTANG))) < 0  ||
        init_io_cache(&purge_index_file, file, IO_SIZE,
                      (destroy ? WRITE_CACHE : READ_CACHE),
                      0, 0, MYF(MY_WME | MY_NABP | MY_WAIT_IF_FULL)))
    {
      error= 1;
      sql_print_error("MYSQL_BIN_LOG::open_purge_index_file failed to open register "
                      " file.");
    }
  }
  DBUG_RETURN(error);
}

int MYSQL_BIN_LOG::close_purge_index_file()
{
  int error= 0;

  DBUG_ENTER("MYSQL_BIN_LOG::close_purge_index_file");

  if (my_b_inited(&purge_index_file))
  {
    end_io_cache(&purge_index_file);
    error= my_close(purge_index_file.file, MYF(0));
  }
  my_delete(purge_index_file_name, MYF(0));
  bzero((char*) &purge_index_file, sizeof(purge_index_file));

  DBUG_RETURN(error);
}

bool MYSQL_BIN_LOG::is_inited_purge_index_file()
{
  DBUG_ENTER("MYSQL_BIN_LOG::is_inited_purge_index_file");
  DBUG_RETURN (my_b_inited(&purge_index_file));
}

int MYSQL_BIN_LOG::sync_purge_index_file()
{
  int error= 0;
  DBUG_ENTER("MYSQL_BIN_LOG::sync_purge_index_file");

  if ((error= flush_io_cache(&purge_index_file)) ||
      (error= my_sync(purge_index_file.file, MYF(MY_WME))))
    DBUG_RETURN(error);

  DBUG_RETURN(error);
}

int MYSQL_BIN_LOG::register_purge_index_entry(const char *entry)
{
  int error= 0;
  DBUG_ENTER("MYSQL_BIN_LOG::register_purge_index_entry");

  if ((error=my_b_write(&purge_index_file, (const uchar*)entry, strlen(entry))) ||
      (error=my_b_write(&purge_index_file, (const uchar*)"\n", 1)))
    DBUG_RETURN (error);

  DBUG_RETURN(error);
}

int MYSQL_BIN_LOG::register_create_index_entry(const char *entry)
{
  DBUG_ENTER("MYSQL_BIN_LOG::register_create_index_entry");
  DBUG_RETURN(register_purge_index_entry(entry));
}

int MYSQL_BIN_LOG::purge_index_entry(THD *thd, ulonglong *decrease_log_space,
                                     bool need_mutex)
{
  MY_STAT s;
  int error= 0;
  LOG_INFO log_info;
  LOG_INFO check_log_info;

  DBUG_ENTER("MYSQL_BIN_LOG:purge_index_entry");

  DBUG_ASSERT(my_b_inited(&purge_index_file));

  if ((error=reinit_io_cache(&purge_index_file, READ_CACHE, 0, 0, 0)))
  {
    sql_print_error("MSYQL_BIN_LOG::purge_index_entry failed to reinit register file "
3443 3444 3445 3446 3447 3448 3449 3450
                    "for read");
    goto err;
  }

  for (;;)
  {
    uint length;

3451
    if ((length=my_b_gets(&purge_index_file, log_info.log_file_name,
3452 3453
                          FN_REFLEN)) <= 1)
    {
3454
      if (purge_index_file.error)
3455
      {
3456 3457 3458
        error= purge_index_file.error;
        sql_print_error("MSYQL_BIN_LOG::purge_index_entry error %d reading from "
                        "register file.", error);
3459 3460 3461 3462 3463 3464 3465 3466 3467 3468
        goto err;
      }

      /* Reached EOF */
      break;
    }

    /* Get rid of the trailing '\n' */
    log_info.log_file_name[length-1]= 0;

3469
    if (!my_stat(log_info.log_file_name, &s, MYF(0)))
3470
    {
3471 3472 3473 3474 3475
      if (my_errno == ENOENT) 
      {
        /*
          It's not fatal if we can't stat a log file that does not exist;
          If we could not stat, we won't delete.
3476
        */
3477 3478 3479 3480 3481 3482
        if (thd)
        {
          push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                              ER_LOG_PURGE_NO_FILE, ER(ER_LOG_PURGE_NO_FILE),
                              log_info.log_file_name);
        }
3483
        sql_print_information("Failed to execute my_stat on file '%s'",
3484
			      log_info.log_file_name);
3485 3486 3487 3488 3489 3490 3491
        my_errno= 0;
      }
      else
      {
        /*
          Other than ENOENT are fatal
        */
3492 3493
        if (thd)
        {
3494
          push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509
                              ER_BINLOG_PURGE_FATAL_ERR,
                              "a problem with getting info on being purged %s; "
                              "consider examining correspondence "
                              "of your binlog index file "
                              "to the actual binlog files",
                              log_info.log_file_name);
        }
        else
        {
          sql_print_information("Failed to delete log file '%s'; "
                                "consider examining correspondence "
                                "of your binlog index file "
                                "to the actual binlog files",
                                log_info.log_file_name);
        }
3510 3511 3512 3513 3514 3515
        error= LOG_INFO_FATAL;
        goto err;
      }
    }
    else
    {
3516
      if ((error= find_log_pos(&check_log_info, log_info.log_file_name, need_mutex)))
3517
      {
3518
        if (error != LOG_INFO_EOF)
3519
        {
3520 3521
          if (thd)
          {
3522
            push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
3523 3524 3525
                                ER_BINLOG_PURGE_FATAL_ERR,
                                "a problem with deleting %s and "
                                "reading the binlog index file",
3526 3527
                                log_info.log_file_name);
          }
3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550
          else
          {
            sql_print_information("Failed to delete file '%s' and "
                                  "read the binlog index file",
                                  log_info.log_file_name);
          }
          goto err;
        }
           
        error= 0;
        if (!need_mutex)
        {
          /*
            This is to avoid triggering an error in NDB.
          */
          ha_binlog_index_purge_file(current_thd, log_info.log_file_name);
        }

        DBUG_PRINT("info",("purging %s",log_info.log_file_name));
        if (!my_delete(log_info.log_file_name, MYF(0)))
        {
          if (decrease_log_space)
            *decrease_log_space-= s.st_size;
3551 3552 3553
        }
        else
        {
3554
          if (my_errno == ENOENT)
3555
          {
3556 3557 3558 3559 3560 3561 3562 3563 3564
            if (thd)
            {
              push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                                  ER_LOG_PURGE_NO_FILE, ER(ER_LOG_PURGE_NO_FILE),
                                  log_info.log_file_name);
            }
            sql_print_information("Failed to delete file '%s'",
                                  log_info.log_file_name);
            my_errno= 0;
3565 3566 3567
          }
          else
          {
3568 3569
            if (thd)
            {
3570
              push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
3571 3572
                                  ER_BINLOG_PURGE_FATAL_ERR,
                                  "a problem with deleting %s; "
3573 3574 3575 3576
                                  "consider examining correspondence "
                                  "of your binlog index file "
                                  "to the actual binlog files",
                                  log_info.log_file_name);
3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593
            }
            else
            {
              sql_print_information("Failed to delete file '%s'; "
                                    "consider examining correspondence "
                                    "of your binlog index file "
                                    "to the actual binlog files",
                                    log_info.log_file_name);
            }
            if (my_errno == EMFILE)
            {
              DBUG_PRINT("info",
                         ("my_errno: %d, set ret = LOG_INFO_EMFILE", my_errno));
              error= LOG_INFO_EMFILE;
              goto err;
            }
            error= LOG_INFO_FATAL;
Kristofer Pettersson's avatar
Kristofer Pettersson committed
3594
            goto err;
3595
          }
3596 3597
        }
      }
3598
    }
3599
  }
3600

unknown's avatar
unknown committed
3601
err:
3602
  DBUG_RETURN(error);
unknown's avatar
unknown committed
3603 3604
}

unknown's avatar
unknown committed
3605
/**
3606 3607 3608
  Remove all logs before the given file date from disk and from the
  index file.

unknown's avatar
unknown committed
3609
  @param thd		Thread pointer
3610
  @param purge_time	Delete all log files before given date.
3611

unknown's avatar
unknown committed
3612
  @note
3613 3614 3615
    If any of the logs before the deleted one is in use,
    only purge logs up to this one.

unknown's avatar
unknown committed
3616
  @retval
3617
    0				ok
unknown's avatar
unknown committed
3618
  @retval
3619
    LOG_INFO_PURGE_NO_ROTATE	Binary file that can't be rotated
3620 3621
    LOG_INFO_FATAL              if any other than ENOENT error from
                                my_stat() or my_delete()
3622 3623
*/

3624
int MYSQL_BIN_LOG::purge_logs_before_date(time_t purge_time)
3625 3626
{
  int error;
3627
  char to_log[FN_REFLEN];
3628 3629
  LOG_INFO log_info;
  MY_STAT stat_area;
3630
  THD *thd= current_thd;
3631
  
3632 3633 3634
  DBUG_ENTER("purge_logs_before_date");

  pthread_mutex_lock(&LOCK_index);
3635
  to_log[0]= 0;
3636 3637

  if ((error=find_log_pos(&log_info, NullS, 0 /*no mutex*/)))
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3638
    goto err;
3639 3640

  while (strcmp(log_file_name, log_info.log_file_name) &&
3641 3642
	 !is_active(log_info.log_file_name) &&
         !log_in_use(log_info.log_file_name))
3643
  {
3644 3645 3646 3647 3648 3649
    if (!my_stat(log_info.log_file_name, &stat_area, MYF(0)))
    {
      if (my_errno == ENOENT) 
      {
        /*
          It's not fatal if we can't stat a log file that does not exist.
3650
        */
3651 3652 3653 3654 3655 3656 3657
        my_errno= 0;
      }
      else
      {
        /*
          Other than ENOENT are fatal
        */
3658 3659
        if (thd)
        {
3660
          push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671 3672
                              ER_BINLOG_PURGE_FATAL_ERR,
                              "a problem with getting info on being purged %s; "
                              "consider examining correspondence "
                              "of your binlog index file "
                              "to the actual binlog files",
                              log_info.log_file_name);
        }
        else
        {
          sql_print_information("Failed to delete log file '%s'",
                                log_info.log_file_name);
        }
3673 3674 3675 3676 3677 3678
        error= LOG_INFO_FATAL;
        goto err;
      }
    }
    else
    {
3679 3680 3681
      if (stat_area.st_mtime < purge_time) 
        strmake(to_log, 
                log_info.log_file_name, 
3682
                sizeof(log_info.log_file_name) - 1);
3683
      else
3684 3685
        break;
    }
3686 3687
    if (find_next_log(&log_info, 0))
      break;
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3688
  }
3689

3690
  error= (to_log[0] ? purge_logs(to_log, 1, 0, 1, (ulonglong *) 0) : 0);
3691

unknown's avatar
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3692 3693
err:
  pthread_mutex_unlock(&LOCK_index);
3694
  DBUG_RETURN(error);
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3695
}
unknown's avatar
SCRUM  
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3696
#endif /* HAVE_REPLICATION */
3697

3698

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3699 3700
/**
  Create a new log file name.
3701

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3702
  @param buf		buf of at least FN_REFLEN where new name is stored
3703

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3704
  @note
3705 3706 3707
    If file name will be longer then FN_REFLEN it will be truncated
*/

3708
void MYSQL_BIN_LOG::make_log_name(char* buf, const char* log_ident)
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3709
{
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3710
  uint dir_len = dirname_length(log_file_name); 
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3711
  if (dir_len >= FN_REFLEN)
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3712 3713
    dir_len=FN_REFLEN-1;
  strnmov(buf, log_file_name, dir_len);
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3714
  strmake(buf+dir_len, log_ident, FN_REFLEN - dir_len -1);
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3715 3716
}

3717

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3718 3719
/**
  Check if we are writing/reading to the given log file.
3720 3721
*/

3722
bool MYSQL_BIN_LOG::is_active(const char *log_file_name_arg)
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3723
{
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3724
  return !strcmp(log_file_name, log_file_name_arg);
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3725 3726
}

3727

3728 3729 3730 3731 3732 3733
/*
  Wrappers around new_file_impl to avoid using argument
  to control locking. The argument 1) less readable 2) breaks
  incapsulation 3) allows external access to the class without
  a lock (which is not possible with private new_file_without_locking
  method).
3734 3735 3736

  @retval
    nonzero - error
3737 3738
*/

3739
int MYSQL_BIN_LOG::new_file()
3740
{
3741
  return new_file_impl(1);
3742 3743
}

3744 3745 3746 3747 3748
/*
  @retval
    nonzero - error
 */
int MYSQL_BIN_LOG::new_file_without_locking()
3749
{
3750
  return new_file_impl(0);
3751 3752 3753
}


unknown's avatar
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3754 3755
/**
  Start writing to a new log file or reopen the old file.
3756

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3757
  @param need_lock		Set to 1 if caller has not locked LOCK_log
3758

3759 3760 3761
  @retval
    nonzero - error

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3762
  @note
3763 3764 3765
    The new file name is stored last in the index file
*/

3766
int MYSQL_BIN_LOG::new_file_impl(bool need_lock)
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3767
{
3768 3769
  int error= 0, close_on_error= FALSE;
  char new_name[FN_REFLEN], *new_name_ptr, *old_name, *file_to_open;
3770

3771
  DBUG_ENTER("MYSQL_BIN_LOG::new_file_impl");
3772
  if (!is_open())
3773 3774
  {
    DBUG_PRINT("info",("log is closed"));
3775
    DBUG_RETURN(error);
3776
  }
3777 3778 3779

  if (need_lock)
    pthread_mutex_lock(&LOCK_log);
3780 3781
  pthread_mutex_lock(&LOCK_index);

3782 3783 3784
  safe_mutex_assert_owner(&LOCK_log);
  safe_mutex_assert_owner(&LOCK_index);

3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797
  /*
    if binlog is used as tc log, be sure all xids are "unlogged",
    so that on recover we only need to scan one - latest - binlog file
    for prepared xids. As this is expected to be a rare event,
    simple wait strategy is enough. We're locking LOCK_log to be sure no
    new Xid_log_event's are added to the log (and prepared_xids is not
    increased), and waiting on COND_prep_xids for late threads to
    catch up.
  */
  if (prepared_xids)
  {
    tc_log_page_waits++;
    pthread_mutex_lock(&LOCK_prep_xids);
3798 3799
    while (prepared_xids) {
      DBUG_PRINT("info", ("prepared_xids=%lu", prepared_xids));
3800
      pthread_cond_wait(&COND_prep_xids, &LOCK_prep_xids);
3801
    }
3802 3803 3804
    pthread_mutex_unlock(&LOCK_prep_xids);
  }

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3805
  /* Reuse old name if not binlog and not update log */
3806
  new_name_ptr= name;
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3807

3808
  /*
3809 3810 3811
    If user hasn't specified an extension, generate a new log name
    We have to do this here and not in open as we want to store the
    new file name in the current binary log file.
3812
  */
3813
  if ((error= generate_new_name(new_name, name)))
3814 3815
    goto end;
  new_name_ptr=new_name;
3816

3817
  if (log_type == LOG_BIN)
3818
  {
3819
    if (!no_auto_events)
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3820
    {
3821
      /*
3822 3823
        We log the whole file name for log file as the user may decide
        to change base names at some point.
3824
      */
3825
      Rotate_log_event r(new_name+dirname_length(new_name),
3826
                         0, LOG_EVENT_OFFSET, is_relay_log ? Rotate_log_event::RELAY_LOG : 0);
3827 3828 3829 3830 3831 3832 3833
      if(DBUG_EVALUATE_IF("fault_injection_new_file_rotate_event", (error=close_on_error=TRUE), FALSE) ||
         (error= r.write(&log_file)))
      {
        close_on_error= TRUE;
        my_printf_error(ER_ERROR_ON_WRITE, ER(ER_CANT_OPEN_FILE), MYF(ME_FATALERROR), name, errno);
        goto end;
      }
3834
      bytes_written += r.data_written;
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3835
    }
3836 3837 3838 3839 3840
    /*
      Update needs to be signalled even if there is no rotate event
      log rotation should give the waiting thread a signal to
      discover EOF and move on to the next log.
    */
3841
    signal_update();
3842 3843 3844
  }
  old_name=name;
  name=0;				// Don't free name
3845
  close(LOG_CLOSE_TO_BE_OPENED | LOG_CLOSE_INDEX);
unknown's avatar
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3846

3847
  /*
3848
     Note that at this point, log_state != LOG_CLOSED (important for is_open()).
unknown's avatar
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3849
  */
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3850

3851
  /*
3852
     new_file() is only used for rotation (in FLUSH LOGS or because size >
3853
     max_binlog_size or max_relay_log_size).
3854 3855 3856 3857
     If this is a binary log, the Format_description_log_event at the beginning of
     the new file should have created=0 (to distinguish with the
     Format_description_log_event written at server startup, which should
     trigger temp tables deletion on slaves.
3858
  */
3859

3860
  /* reopen index binlog file, BUG#34582 */
3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878
  file_to_open= index_file_name;
  error= open_index_file(index_file_name, 0, FALSE);
  if (!error)
  {
    /* reopen the binary log file. */
    file_to_open= new_name_ptr;
    error= open(old_name, log_type, new_name_ptr, io_cache_type,
                no_auto_events, max_size, 1, FALSE);
  }

  /* handle reopening errors */
  if (error)
  {
    my_printf_error(ER_CANT_OPEN_FILE, ER(ER_CANT_OPEN_FILE), 
                    MYF(ME_FATALERROR), file_to_open, error);
    close_on_error= TRUE;
  }

3879 3880
  my_free(old_name,MYF(0));

3881
end:
3882 3883 3884 3885 3886 3887 3888 3889 3890 3891 3892 3893 3894 3895 3896 3897 3898 3899 3900 3901 3902 3903 3904 3905

  if (error && close_on_error /* rotate or reopen failed */)
  {
    /* 
      Close whatever was left opened.

      We are keeping the behavior as it exists today, ie,
      we disable logging and move on (see: BUG#51014).

      TODO: as part of WL#1790 consider other approaches:
       - kill mysql (safety);
       - try multiple locations for opening a log file;
       - switch server to protected/readonly mode
       - ...
    */
    close(LOG_CLOSE_INDEX);
    sql_print_error("Could not open %s for logging (error %d). "
                     "Turning logging off for the whole duration "
                     "of the MySQL server process. To turn it on "
                     "again: fix the cause, shutdown the MySQL "
                     "server and restart it.", 
                     new_name_ptr, errno);
  }

3906 3907
  if (need_lock)
    pthread_mutex_unlock(&LOCK_log);
3908 3909
  pthread_mutex_unlock(&LOCK_index);

3910
  DBUG_RETURN(error);
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3911 3912
}

3913

3914
bool MYSQL_BIN_LOG::append(Log_event* ev)
3915 3916 3917
{
  bool error = 0;
  pthread_mutex_lock(&LOCK_log);
3918
  DBUG_ENTER("MYSQL_BIN_LOG::append");
3919

3920
  DBUG_ASSERT(log_file.type == SEQ_READ_APPEND);
3921 3922 3923 3924
  /*
    Log_event::write() is smart enough to use my_b_write() or
    my_b_append() depending on the kind of cache we have.
  */
3925 3926 3927 3928 3929
  if (ev->write(&log_file))
  {
    error=1;
    goto err;
  }
3930
  bytes_written+= ev->data_written;
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3931
  DBUG_PRINT("info",("max_size: %lu",max_size));
3932
  if ((uint) my_b_append_tell(&log_file) > max_size)
3933
    error= new_file_without_locking();
3934
err:
3935
  pthread_mutex_unlock(&LOCK_log);
3936
  signal_update();				// Safe as we don't call close
3937
  DBUG_RETURN(error);
3938 3939
}

3940

3941
bool MYSQL_BIN_LOG::appendv(const char* buf, uint len,...)
3942
{
3943
  bool error= 0;
3944
  DBUG_ENTER("MYSQL_BIN_LOG::appendv");
3945 3946
  va_list(args);
  va_start(args,len);
3947

3948
  DBUG_ASSERT(log_file.type == SEQ_READ_APPEND);
3949

3950
  safe_mutex_assert_owner(&LOCK_log);
3951 3952
  do
  {
3953
    if (my_b_append(&log_file,(uchar*) buf,len))
3954
    {
3955 3956
      error= 1;
      goto err;
3957
    }
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3958
    bytes_written += len;
3959
  } while ((buf=va_arg(args,const char*)) && (len=va_arg(args,uint)));
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3960
  DBUG_PRINT("info",("max_size: %lu",max_size));
3961
  if ((uint) my_b_append_tell(&log_file) > max_size)
3962
    error= new_file_without_locking();
3963
err:
3964 3965
  if (!error)
    signal_update();
3966
  DBUG_RETURN(error);
3967
}
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3968

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3969

3970
bool MYSQL_BIN_LOG::flush_and_sync()
3971
{
3972 3973 3974 3975 3976
  int err=0, fd=log_file.file;
  safe_mutex_assert_owner(&LOCK_log);
  if (flush_io_cache(&log_file))
    return 1;
  if (++sync_binlog_counter >= sync_binlog_period && sync_binlog_period)
3977 3978
  {
    sync_binlog_counter= 0;
3979
    err=my_sync(fd, MYF(MY_WME));
3980
  }
3981
  return err;
3982 3983
}

3984
void MYSQL_BIN_LOG::start_union_events(THD *thd, query_id_t query_id_param)
3985 3986 3987 3988 3989
{
  DBUG_ASSERT(!thd->binlog_evt_union.do_union);
  thd->binlog_evt_union.do_union= TRUE;
  thd->binlog_evt_union.unioned_events= FALSE;
  thd->binlog_evt_union.unioned_events_trans= FALSE;
3990
  thd->binlog_evt_union.first_query_id= query_id_param;
3991 3992
}

3993
void MYSQL_BIN_LOG::stop_union_events(THD *thd)
3994 3995 3996 3997 3998
{
  DBUG_ASSERT(thd->binlog_evt_union.do_union);
  thd->binlog_evt_union.do_union= FALSE;
}

3999
bool MYSQL_BIN_LOG::is_query_in_union(THD *thd, query_id_t query_id_param)
4000 4001 4002 4003 4004
{
  return (thd->binlog_evt_union.do_union && 
          query_id_param >= thd->binlog_evt_union.first_query_id);
}

4005 4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065
/**
  This function checks if a transaction, either a multi-statement
  or a single statement transaction is about to commit or not.

  @param thd The client thread that executed the current statement.
  @param all Committing a transaction (i.e. TRUE) or a statement
             (i.e. FALSE).
  @return
    @c true if committing a transaction, otherwise @c false.
*/
bool ending_trans(const THD* thd, const bool all)
{
  return (all || (!all && !(thd->options & 
                  (OPTION_BEGIN | OPTION_NOT_AUTOCOMMIT))));
}

/**
  This function checks if a non-transactional table was updated by
  the current transaction.

  @param thd The client thread that executed the current statement.
  @return
    @c true if a non-transactional table was updated, @c false
    otherwise.
*/
bool trans_has_updated_non_trans_table(const THD* thd)
{
  return (thd->transaction.all.modified_non_trans_table ||
          thd->transaction.stmt.modified_non_trans_table);
}

/**
  This function checks if any statement was committed and cached.

  @param thd The client thread that executed the current statement.
  @param all Committing a transaction (i.e. TRUE) or a statement
             (i.e. FALSE).
  @return
    @c true if at a statement was committed and cached, @c false
    otherwise.
*/
bool trans_has_no_stmt_committed(const THD* thd, bool all)
{
  binlog_trx_data *const trx_data=
    (binlog_trx_data*) thd_get_ha_data(thd, binlog_hton);

  return (!all && !trx_data->at_least_one_stmt_committed);
}

/**
  This function checks if a non-transactional table was updated by the
  current statement.

  @param thd The client thread that executed the current statement.
  @return
    @c true if a non-transactional table was updated, @c false otherwise.
*/
bool stmt_has_updated_non_trans_table(const THD* thd)
{
  return (thd->transaction.stmt.modified_non_trans_table);
}
4066 4067 4068 4069 4070 4071 4072 4073 4074 4075

/*
  These functions are placed in this file since they need access to
  binlog_hton, which has internal linkage.
*/

int THD::binlog_setup_trx_data()
{
  DBUG_ENTER("THD::binlog_setup_trx_data");
  binlog_trx_data *trx_data=
4076
    (binlog_trx_data*) thd_get_ha_data(this, binlog_hton);
4077 4078 4079 4080

  if (trx_data)
    DBUG_RETURN(0);                             // Already set up

4081
  trx_data= (binlog_trx_data*) my_malloc(sizeof(binlog_trx_data), MYF(MY_ZEROFILL));
4082 4083 4084 4085
  if (!trx_data ||
      open_cached_file(&trx_data->trans_log, mysql_tmpdir,
                       LOG_PREFIX, binlog_cache_size, MYF(MY_WME)))
  {
4086
    my_free((uchar*)trx_data, MYF(MY_ALLOW_ZERO_PTR));
4087 4088
    DBUG_RETURN(1);                      // Didn't manage to set it up
  }
4089
  thd_set_ha_data(this, binlog_hton, trx_data);
4090

4091
  trx_data= new (thd_get_ha_data(this, binlog_hton)) binlog_trx_data;
4092

4093 4094 4095
  DBUG_RETURN(0);
}

4096
/*
4097 4098
  Function to start a statement and optionally a transaction for the
  binary log.
4099

4100 4101
  SYNOPSIS
    binlog_start_trans_and_stmt()
4102

4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125 4126
  DESCRIPTION

    This function does three things:
    - Start a transaction if not in autocommit mode or if a BEGIN
      statement has been seen.

    - Start a statement transaction to allow us to truncate the binary
      log.

    - Save the currrent binlog position so that we can roll back the
      statement by truncating the transaction log.

      We only update the saved position if the old one was undefined,
      the reason is that there are some cases (e.g., for CREATE-SELECT)
      where the position is saved twice (e.g., both in
      select_create::prepare() and THD::binlog_write_table_map()) , but
      we should use the first. This means that calls to this function
      can be used to start the statement before the first table map
      event, to include some extra events.
 */

void
THD::binlog_start_trans_and_stmt()
{
4127
  binlog_trx_data *trx_data= (binlog_trx_data*) thd_get_ha_data(this, binlog_hton);
unknown's avatar
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4128 4129 4130 4131 4132 4133
  DBUG_ENTER("binlog_start_trans_and_stmt");
  DBUG_PRINT("enter", ("trx_data: 0x%lx  trx_data->before_stmt_pos: %lu",
                       (long) trx_data,
                       (trx_data ? (ulong) trx_data->before_stmt_pos :
                        (ulong) 0)));

4134
  if (trx_data == NULL ||
4135
      trx_data->before_stmt_pos == MY_OFF_T_UNDEF)
4136
  {
4137
    this->binlog_set_stmt_begin();
4138
    if (options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))
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4139 4140
      trans_register_ha(this, TRUE, binlog_hton);
    trans_register_ha(this, FALSE, binlog_hton);
4141 4142 4143 4144 4145 4146 4147 4148 4149 4150
    /*
      Mark statement transaction as read/write. We never start
      a binary log transaction and keep it read-only,
      therefore it's best to mark the transaction read/write just
      at the same time we start it.
      Not necessary to mark the normal transaction read/write
      since the statement-level flag will be propagated automatically
      inside ha_commit_trans.
    */
    ha_data[binlog_hton->slot].ha_info[0].set_trx_read_write();
4151 4152 4153 4154
  }
  DBUG_VOID_RETURN;
}

4155 4156
void THD::binlog_set_stmt_begin() {
  binlog_trx_data *trx_data=
4157
    (binlog_trx_data*) thd_get_ha_data(this, binlog_hton);
4158 4159 4160 4161 4162 4163 4164 4165 4166

  /*
    The call to binlog_trans_log_savepos() might create the trx_data
    structure, if it didn't exist before, so we save the position
    into an auto variable and then write it into the transaction
    data for the binary log (i.e., trx_data).
  */
  my_off_t pos= 0;
  binlog_trans_log_savepos(this, &pos);
4167
  trx_data= (binlog_trx_data*) thd_get_ha_data(this, binlog_hton);
4168 4169 4170 4171
  trx_data->before_stmt_pos= pos;
}


4172 4173
/*
  Write a table map to the binary log.
4174 4175
 */

4176 4177
int THD::binlog_write_table_map(TABLE *table, bool is_trans)
{
4178
  int error;
4179
  DBUG_ENTER("THD::binlog_write_table_map");
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4180 4181
  DBUG_PRINT("enter", ("table: 0x%lx  (%s: #%lu)",
                       (long) table, table->s->table_name.str,
4182
                       table->s->table_map_id));
4183 4184

  /* Pre-conditions */
4185
  DBUG_ASSERT(current_stmt_binlog_row_based && mysql_bin_log.is_open());
4186 4187 4188
  DBUG_ASSERT(table->s->table_map_id != ULONG_MAX);

  Table_map_log_event
4189
    the_event(this, table, table->s->table_map_id, is_trans);
4190

4191 4192
  if (is_trans && binlog_table_maps == 0)
    binlog_start_trans_and_stmt();
4193

4194
  if ((error= mysql_bin_log.write(&the_event)))
4195 4196
    DBUG_RETURN(error);

4197
  binlog_table_maps++;
4198 4199 4200
  DBUG_RETURN(0);
}

4201 4202 4203 4204
Rows_log_event*
THD::binlog_get_pending_rows_event() const
{
  binlog_trx_data *const trx_data=
4205
    (binlog_trx_data*) thd_get_ha_data(this, binlog_hton);
4206 4207 4208 4209 4210 4211
  /*
    This is less than ideal, but here's the story: If there is no
    trx_data, prepare_pending_rows_event() has never been called
    (since the trx_data is set up there). In that case, we just return
    NULL.
   */
4212
  return trx_data ? trx_data->pending() : NULL;
4213 4214 4215 4216 4217
}

void
THD::binlog_set_pending_rows_event(Rows_log_event* ev)
{
4218
  if (thd_get_ha_data(this, binlog_hton) == NULL)
4219 4220
    binlog_setup_trx_data();

4221
  binlog_trx_data *const trx_data=
4222
    (binlog_trx_data*) thd_get_ha_data(this, binlog_hton);
4223

4224
  DBUG_ASSERT(trx_data);
4225
  trx_data->set_pending(ev);
4226 4227 4228
}


4229 4230 4231 4232 4233 4234 4235 4236 4237
/**
  Remove the pending rows event, discarding any outstanding rows.

  If there is no pending rows event available, this is effectively a
  no-op.
 */
int
MYSQL_BIN_LOG::remove_pending_rows_event(THD *thd)
{
4238
  DBUG_ENTER("MYSQL_BIN_LOG::remove_pending_rows_event");
4239 4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250 4251 4252 4253

  binlog_trx_data *const trx_data=
    (binlog_trx_data*) thd_get_ha_data(thd, binlog_hton);

  DBUG_ASSERT(trx_data);

  if (Rows_log_event* pending= trx_data->pending())
  {
    delete pending;
    trx_data->set_pending(NULL);
  }

  DBUG_RETURN(0);
}

4254 4255 4256 4257 4258
/*
  Moves the last bunch of rows from the pending Rows event to the binlog
  (either cached binlog if transaction, or disk binlog). Sets a new pending
  event.
*/
4259 4260 4261
int
MYSQL_BIN_LOG::flush_and_set_pending_rows_event(THD *thd,
                                                Rows_log_event* event)
4262
{
4263
  DBUG_ENTER("MYSQL_BIN_LOG::flush_and_set_pending_rows_event(event)");
4264
  DBUG_ASSERT(mysql_bin_log.is_open());
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4265
  DBUG_PRINT("enter", ("event: 0x%lx", (long) event));
4266 4267 4268 4269

  int error= 0;

  binlog_trx_data *const trx_data=
4270
    (binlog_trx_data*) thd_get_ha_data(thd, binlog_hton);
4271 4272 4273

  DBUG_ASSERT(trx_data);

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4274
  DBUG_PRINT("info", ("trx_data->pending(): 0x%lx", (long) trx_data->pending()));
4275

4276
  if (Rows_log_event* pending= trx_data->pending())
4277 4278 4279 4280 4281 4282 4283 4284 4285 4286 4287
  {
    IO_CACHE *file= &log_file;

    /*
      Decide if we should write to the log file directly or to the
      transaction log.
    */
    if (pending->get_cache_stmt() || my_b_tell(&trx_data->trans_log))
      file= &trx_data->trans_log;

    /*
4288 4289
      If we are not writing to the log file directly, we could avoid
      locking the log.
4290 4291 4292 4293 4294 4295 4296 4297 4298
    */
    pthread_mutex_lock(&LOCK_log);

    /*
      Write pending event to log file or transaction cache
    */
    if (pending->write(file))
    {
      pthread_mutex_unlock(&LOCK_log);
4299
      set_write_error(thd);
4300 4301 4302 4303 4304 4305 4306 4307 4308 4309 4310
      DBUG_RETURN(1);
    }

    delete pending;

    if (file == &log_file)
    {
      error= flush_and_sync();
      if (!error)
      {
        signal_update();
4311
        error= rotate_and_purge(RP_LOCK_LOG_IS_ALREADY_LOCKED);
4312 4313 4314 4315 4316 4317
      }
    }

    pthread_mutex_unlock(&LOCK_log);
  }

4318
  thd->binlog_set_pending_rows_event(event);
4319 4320 4321 4322

  DBUG_RETURN(error);
}

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4323 4324
/**
  Write an event to the binary log.
4325 4326
*/

4327
bool MYSQL_BIN_LOG::write(Log_event *event_info)
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4328
{
4329 4330
  THD *thd= event_info->thd;
  bool error= 1;
4331
  DBUG_ENTER("MYSQL_BIN_LOG::write(Log_event *)");
4332

4333 4334
  if (thd->binlog_evt_union.do_union)
  {
4335 4336 4337 4338
    /*
      In Stored function; Remember that function call caused an update.
      We will log the function call to the binary log on function exit
    */
4339 4340 4341 4342
    thd->binlog_evt_union.unioned_events= TRUE;
    thd->binlog_evt_union.unioned_events_trans |= event_info->cache_stmt;
    DBUG_RETURN(0);
  }
4343 4344 4345 4346 4347 4348 4349

  /*
    Flush the pending rows event to the transaction cache or to the
    log file.  Since this function potentially aquire the LOCK_log
    mutex, we do this before aquiring the LOCK_log mutex in this
    function.

4350 4351 4352
    We only end the statement if we are in a top-level statement.  If
    we are inside a stored function, we do not end the statement since
    this will close all tables on the slave.
4353
  */
4354 4355
  bool const end_stmt=
    thd->prelocked_mode && thd->lex->requires_prelocking();
4356 4357
  if (thd->binlog_flush_pending_rows_event(end_stmt))
    DBUG_RETURN(error);
4358

4359 4360
  pthread_mutex_lock(&LOCK_log);

4361
  /*
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4362 4363 4364 4365
     In most cases this is only called if 'is_open()' is true; in fact this is
     mostly called if is_open() *was* true a few instructions before, but it
     could have changed since.
  */
4366
  if (likely(is_open()))
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4367
  {
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4368
    IO_CACHE *file= &log_file;
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SCRUM  
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4369
#ifdef HAVE_REPLICATION
4370
    /*
4371 4372 4373
      In the future we need to add to the following if tests like
      "do the involved tables match (to be implemented)
      binlog_[wild_]{do|ignore}_table?" (WL#1049)"
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4374
    */
4375
    const char *local_db= event_info->get_db();
4376
    if ((thd && !(thd->options & OPTION_BIN_LOG)) ||
4377 4378 4379
	(thd->lex->sql_command != SQLCOM_ROLLBACK_TO_SAVEPOINT &&
         thd->lex->sql_command != SQLCOM_SAVEPOINT &&
         !binlog_filter->db_ok(local_db)))
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4380
    {
4381
      VOID(pthread_mutex_unlock(&LOCK_log));
4382
      DBUG_RETURN(0);
4383
    }
unknown's avatar
SCRUM  
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4384
#endif /* HAVE_REPLICATION */
4385

4386
#if defined(USING_TRANSACTIONS) 
4387 4388
    /*
      Should we write to the binlog cache or to the binlog on disk?
4389

4390
      Write to the binlog cache if:
4391 4392 4393 4394 4395 4396 4397 4398 4399 4400 4401 4402
      1 - a transactional engine/table is updated (stmt_has_updated_trans_table == TRUE);
      2 - or the event asks for it (cache_stmt == TRUE);
      3 - or the cache is already not empty (meaning we're in a transaction;
      note that the present event could be about a non-transactional table, but
      still we need to write to the binlog cache in that case to handle updates
      to mixed trans/non-trans table types).
      
      Write to the binlog on disk if only a non-transactional engine is
      updated and:
      1 - the binlog cache is empty or;
      2 - --binlog-direct-non-transactional-updates is set and we are about to
      use the statement format. When using the row format (cache_stmt == TRUE).
4403 4404 4405
    */
    if (opt_using_transactions && thd)
    {
4406 4407
      if (thd->binlog_setup_trx_data())
        goto err;
4408

4409
      binlog_trx_data *const trx_data=
4410
        (binlog_trx_data*) thd_get_ha_data(thd, binlog_hton);
4411
      IO_CACHE *trans_log= &trx_data->trans_log;
4412
      my_off_t trans_log_pos= my_b_tell(trans_log);
4413 4414 4415
      if (event_info->get_cache_stmt() || stmt_has_updated_trans_table(thd) ||
          (!thd->variables.binlog_direct_non_trans_update &&
            trans_log_pos != 0))
4416
      {
unknown's avatar
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4417
        DBUG_PRINT("info", ("Using trans_log: cache: %d, trans_log_pos: %lu",
4418
                            event_info->get_cache_stmt(),
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4419
                            (ulong) trans_log_pos));
4420
        thd->binlog_start_trans_and_stmt();
4421
        file= trans_log;
4422
      }
4423
      /*
4424
        TODO as Mats suggested, for all the cases above where we write to
4425 4426
        trans_log, it sounds unnecessary to lock LOCK_log. We should rather
        test first if we want to write to trans_log, and if not, lock
4427
        LOCK_log.
4428
      */
4429
    }
4430
#endif /* USING_TRANSACTIONS */
4431
    DBUG_PRINT("info",("event type: %d",event_info->get_type_code()));
4432

unknown's avatar
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4433 4434 4435 4436
    /*
      No check for auto events flag here - this write method should
      never be called if auto-events are enabled
    */
unknown's avatar
unknown committed
4437 4438

    /*
4439 4440
      1. Write first log events which describe the 'run environment'
      of the SQL command
unknown's avatar
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4441 4442
    */

4443 4444 4445 4446
    /*
      If row-based binlogging, Insert_id, Rand and other kind of "setting
      context" events are not needed.
    */
4447
    if (thd)
4448
    {
4449
      if (!thd->current_stmt_binlog_row_based)
4450
      {
4451
        if (thd->stmt_depends_on_first_successful_insert_id_in_prev_stmt)
4452 4453
        {
          Intvar_log_event e(thd,(uchar) LAST_INSERT_ID_EVENT,
4454
                             thd->first_successful_insert_id_in_prev_stmt_for_binlog);
4455 4456 4457
          if (e.write(file))
            goto err;
        }
4458
        if (thd->auto_inc_intervals_in_cur_stmt_for_binlog.nb_elements() > 0)
4459
        {
unknown's avatar
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4460 4461 4462 4463 4464 4465
          DBUG_PRINT("info",("number of auto_inc intervals: %u",
                             thd->auto_inc_intervals_in_cur_stmt_for_binlog.
                             nb_elements()));
          Intvar_log_event e(thd, (uchar) INSERT_ID_EVENT,
                             thd->auto_inc_intervals_in_cur_stmt_for_binlog.
                             minimum());
4466 4467 4468 4469 4470 4471 4472 4473 4474 4475 4476 4477 4478 4479
          if (e.write(file))
            goto err;
        }
        if (thd->rand_used)
        {
          Rand_log_event e(thd,thd->rand_saved_seed1,thd->rand_saved_seed2);
          if (e.write(file))
            goto err;
        }
        if (thd->user_var_events.elements)
        {
          for (uint i= 0; i < thd->user_var_events.elements; i++)
          {
            BINLOG_USER_VAR_EVENT *user_var_event;
4480
            get_dynamic(&thd->user_var_events,(uchar*) &user_var_event, i);
4481 4482 4483 4484 4485 4486 4487 4488 4489 4490
            User_var_log_event e(thd, user_var_event->user_var_event->name.str,
                                 user_var_event->user_var_event->name.length,
                                 user_var_event->value,
                                 user_var_event->length,
                                 user_var_event->type,
                                 user_var_event->charset_number);
            if (e.write(file))
              goto err;
          }
        }
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unknown committed
4491
      }
4492
    }
unknown's avatar
unknown committed
4493

4494 4495
    /*
       Write the SQL command
4496
     */
unknown's avatar
unknown committed
4497

4498 4499
    if (event_info->write(file) || 
        DBUG_EVALUATE_IF("injecting_fault_writing", 1, 0))
4500
      goto err;
unknown's avatar
unknown committed
4501

4502
    if (file == &log_file) // we are writing to the real log (disk)
unknown's avatar
unknown committed
4503
    {
4504
      if (flush_and_sync())
unknown's avatar
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4505
	goto err;
4506
      signal_update();
4507 4508 4509
      if ((error= rotate_and_purge(RP_LOCK_LOG_IS_ALREADY_LOCKED)))
        goto err;
      
4510
    }
unknown's avatar
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4511
    error=0;
4512

4513 4514
err:
    if (error)
4515
      set_write_error(thd);
4516
  }
4517 4518

  pthread_mutex_unlock(&LOCK_log);
4519
  DBUG_RETURN(error);
4520 4521
}

4522 4523 4524 4525 4526 4527 4528 4529 4530

int error_log_print(enum loglevel level, const char *format,
                    va_list args)
{
  return logger.error_log_print(level, format, args);
}


bool slow_log_print(THD *thd, const char *query, uint query_length,
4531
                    ulonglong current_utime)
4532
{
4533
  return logger.slow_log_print(thd, query, query_length, current_utime);
4534 4535 4536
}


4537 4538 4539 4540 4541 4542 4543 4544 4545 4546 4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559 4560 4561 4562 4563 4564
bool LOGGER::log_command(THD *thd, enum enum_server_command command)
{
#ifndef NO_EMBEDDED_ACCESS_CHECKS
  Security_context *sctx= thd->security_ctx;
#endif
  /*
    Log command if we have at least one log event handler enabled and want
    to log this king of commands
  */
  if (*general_log_handler_list && (what_to_log & (1L << (uint) command)))
  {
    if ((thd->options & OPTION_LOG_OFF)
#ifndef NO_EMBEDDED_ACCESS_CHECKS
         && (sctx->master_access & SUPER_ACL)
#endif
       )
    {
      /* No logging */
      return FALSE;
    }

    return TRUE;
  }

  return FALSE;
}


4565 4566 4567 4568 4569 4570
bool general_log_print(THD *thd, enum enum_server_command command,
                       const char *format, ...)
{
  va_list args;
  uint error= 0;

4571 4572 4573 4574
  /* Print the message to the buffer if we want to log this king of commands */
  if (! logger.log_command(thd, command))
    return FALSE;

4575 4576 4577 4578 4579 4580 4581
  va_start(args, format);
  error= logger.general_log_print(thd, command, format, args);
  va_end(args);

  return error;
}

4582 4583 4584 4585 4586 4587 4588 4589 4590 4591
bool general_log_write(THD *thd, enum enum_server_command command,
                       const char *query, uint query_length)
{
  /* Write the message to the log if we want to log this king of commands */
  if (logger.log_command(thd, command))
    return logger.general_log_write(thd, command, query, query_length);

  return FALSE;
}

4592 4593 4594 4595 4596 4597 4598 4599 4600 4601
/**
  @note
    If rotation fails, for instance the server was unable 
    to create a new log file, we still try to write an 
    incident event to the current log.

  @retval
    nonzero - error 
*/
int MYSQL_BIN_LOG::rotate_and_purge(uint flags)
4602
{
4603 4604
  int error= 0;
  DBUG_ENTER("MYSQL_BIN_LOG::rotate_and_purge");
4605 4606 4607
#ifdef HAVE_REPLICATION
  bool check_purge= false;
#endif
4608 4609
  if (!(flags & RP_LOCK_LOG_IS_ALREADY_LOCKED))
    pthread_mutex_lock(&LOCK_log);
4610 4611
  if ((flags & RP_FORCE_ROTATE) ||
      (my_b_tell(&log_file) >= (my_off_t) max_size))
4612
  {
4613 4614 4615 4616 4617 4618 4619 4620 4621 4622 4623 4624 4625
    if ((error= new_file_without_locking()))
      /** 
         Be conservative... There are possible lost events (eg, 
         failing to log the Execute_load_query_log_event
         on a LOAD DATA while using a non-transactional
         table)!

         We give it a shot and try to write an incident event anyway
         to the current log. 
      */
      if (!write_incident(current_thd, FALSE))
        flush_and_sync();

4626
#ifdef HAVE_REPLICATION
4627
    check_purge= true;
4628 4629
#endif
  }
4630 4631
  if (!(flags & RP_LOCK_LOG_IS_ALREADY_LOCKED))
    pthread_mutex_unlock(&LOCK_log);
4632 4633 4634 4635 4636
#ifdef HAVE_REPLICATION
  /*
    NOTE: Run purge_logs wo/ holding LOCK_log
          as it otherwise will deadlock in ndbcluster_binlog_index_purge_file
  */
4637
  if (!error && check_purge && expire_logs_days)
4638 4639 4640 4641 4642 4643
  {
    time_t purge_time= my_time(0) - expire_logs_days*24*60*60;
    if (purge_time >= 0)
      purge_logs_before_date(purge_time);
  }
#endif
4644
  DBUG_RETURN(error);
4645
}
4646

4647
uint MYSQL_BIN_LOG::next_file_id()
unknown's avatar
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4648 4649 4650 4651 4652 4653 4654 4655
{
  uint res;
  pthread_mutex_lock(&LOCK_log);
  res = file_id++;
  pthread_mutex_unlock(&LOCK_log);
  return res;
}

4656

4657 4658 4659 4660 4661 4662 4663 4664 4665 4666 4667 4668 4669 4670 4671 4672 4673 4674 4675 4676
/*
  Write the contents of a cache to the binary log.

  SYNOPSIS
    write_cache()
    cache    Cache to write to the binary log
    lock_log True if the LOCK_log mutex should be aquired, false otherwise
    sync_log True if the log should be flushed and sync:ed

  DESCRIPTION
    Write the contents of the cache to the binary log. The cache will
    be reset as a READ_CACHE to be able to read the contents from it.
 */

int MYSQL_BIN_LOG::write_cache(IO_CACHE *cache, bool lock_log, bool sync_log)
{
  Mutex_sentry sentry(lock_log ? &LOCK_log : NULL);

  if (reinit_io_cache(cache, READ_CACHE, 0, 0, 0))
    return ER_ERROR_ON_WRITE;
4677
  uint length= my_b_bytes_in_cache(cache), group, carry, hdr_offs;
4678 4679 4680
  long val;
  uchar header[LOG_EVENT_HEADER_LEN];

4681 4682 4683 4684 4685 4686 4687 4688 4689 4690 4691 4692 4693 4694
  /*
    The events in the buffer have incorrect end_log_pos data
    (relative to beginning of group rather than absolute),
    so we'll recalculate them in situ so the binlog is always
    correct, even in the middle of a group. This is possible
    because we now know the start position of the group (the
    offset of this cache in the log, if you will); all we need
    to do is to find all event-headers, and add the position of
    the group to the end_log_pos of each event.  This is pretty
    straight forward, except that we read the cache in segments,
    so an event-header might end up on the cache-border and get
    split.
  */

4695
  group= (uint)my_b_tell(&log_file);
4696 4697
  hdr_offs= carry= 0;

4698 4699
  do
  {
4700 4701 4702 4703 4704 4705

    /*
      if we only got a partial header in the last iteration,
      get the other half now and process a full header.
    */
    if (unlikely(carry > 0))
4706 4707 4708
    {
      DBUG_ASSERT(carry < LOG_EVENT_HEADER_LEN);

4709
      /* assemble both halves */
4710 4711
      memcpy(&header[carry], (char *)cache->read_pos, LOG_EVENT_HEADER_LEN - carry);

4712
      /* fix end_log_pos */
4713 4714 4715
      val= uint4korr(&header[LOG_POS_OFFSET]) + group;
      int4store(&header[LOG_POS_OFFSET], val);

4716
      /* write the first half of the split header */
4717 4718 4719
      if (my_b_write(&log_file, header, carry))
        return ER_ERROR_ON_WRITE;

4720 4721 4722 4723
      /*
        copy fixed second half of header to cache so the correct
        version will be written later.
      */
4724 4725
      memcpy((char *)cache->read_pos, &header[carry], LOG_EVENT_HEADER_LEN - carry);

4726
      /* next event header at ... */
4727
      hdr_offs = uint4korr(&header[EVENT_LEN_OFFSET]) - carry;
4728 4729 4730 4731

      carry= 0;
    }

4732 4733
    /* if there is anything to write, process it. */

4734
    if (likely(length > 0))
4735
    {
4736
      /*
4737 4738 4739 4740
        process all event-headers in this (partial) cache.
        if next header is beyond current read-buffer,
        we'll get it later (though not necessarily in the
        very next iteration, just "eventually").
4741
      */
4742

4743
      while (hdr_offs < length)
4744
      {
4745 4746 4747 4748
        /*
          partial header only? save what we can get, process once
          we get the rest.
        */
4749

4750
        if (hdr_offs + LOG_EVENT_HEADER_LEN > length)
4751
        {
4752
          carry= length - hdr_offs;
4753
          memcpy(header, (char *)cache->read_pos + hdr_offs, carry);
4754
          length= hdr_offs;
4755 4756 4757 4758
        }
        else
        {
          /* we've got a full event-header, and it came in one piece */
4759

4760
          uchar *log_pos= (uchar *)cache->read_pos + hdr_offs + LOG_POS_OFFSET;
4761

4762 4763 4764
          /* fix end_log_pos */
          val= uint4korr(log_pos) + group;
          int4store(log_pos, val);
4765

4766 4767 4768
          /* next event header at ... */
          log_pos= (uchar *)cache->read_pos + hdr_offs + EVENT_LEN_OFFSET;
          hdr_offs += uint4korr(log_pos);
4769

4770
        }
4771
      }
4772 4773

      /*
4774 4775 4776 4777 4778 4779
        Adjust hdr_offs. Note that it may still point beyond the segment
        read in the next iteration; if the current event is very long,
        it may take a couple of read-iterations (and subsequent adjustments
        of hdr_offs) for it to point into the then-current segment.
        If we have a split header (!carry), hdr_offs will be set at the
        beginning of the next iteration, overwriting the value we set here:
4780
      */
4781
      hdr_offs -= length;
4782 4783 4784
    }

    /* Write data to the binary log file */
4785
    if (my_b_write(&log_file, cache->read_pos, length))
4786
      return ER_ERROR_ON_WRITE;
4787
    cache->read_pos=cache->read_end;		// Mark buffer used up
4788
  } while ((length= my_b_fill(cache)));
4789

4790
  DBUG_ASSERT(carry == 0);
4791 4792 4793 4794 4795 4796 4797

  if (sync_log)
    flush_and_sync();

  return 0;                                     // All OK
}

4798 4799 4800 4801 4802 4803 4804
/*
  Helper function to get the error code of the query to be binlogged.
 */
int query_error_code(THD *thd, bool not_killed)
{
  int error;
  
4805
  if (not_killed || (thd->killed == THD::KILL_BAD_DATA))
4806 4807 4808 4809 4810 4811 4812 4813 4814 4815 4816 4817 4818 4819 4820 4821 4822 4823 4824 4825 4826
  {
    error= thd->is_error() ? thd->main_da.sql_errno() : 0;

    /* thd->main_da.sql_errno() might be ER_SERVER_SHUTDOWN or
       ER_QUERY_INTERRUPTED, So here we need to make sure that error
       is not set to these errors when specified not_killed by the
       caller.
    */
    if (error == ER_SERVER_SHUTDOWN || error == ER_QUERY_INTERRUPTED)
      error= 0;
  }
  else
  {
    /* killed status for DELAYED INSERT thread should never be used */
    DBUG_ASSERT(!(thd->system_thread & SYSTEM_THREAD_DELAYED_INSERT));
    error= thd->killed_errno();
  }

  return error;
}

4827 4828 4829 4830 4831 4832 4833 4834 4835 4836
bool MYSQL_BIN_LOG::write_incident(THD *thd, bool lock)
{
  uint error= 0;
  DBUG_ENTER("MYSQL_BIN_LOG::write_incident");
  LEX_STRING const write_error_msg=
    { C_STRING_WITH_LEN("error writing to the binary log") };
  Incident incident= INCIDENT_LOST_EVENTS;
  Incident_log_event ev(thd, incident, write_error_msg);
  if (lock)
    pthread_mutex_lock(&LOCK_log);
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4837
  error= ev.write(&log_file);
4838 4839 4840 4841 4842
  if (lock)
  {
    if (!error && !(error= flush_and_sync()))
    {
      signal_update();
4843
      error= rotate_and_purge(RP_LOCK_LOG_IS_ALREADY_LOCKED);
4844 4845 4846 4847 4848 4849
    }
    pthread_mutex_unlock(&LOCK_log);
  }
  DBUG_RETURN(error);
}

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4850 4851 4852 4853 4854 4855 4856 4857 4858 4859 4860
/**
  Write a cached log entry to the binary log.
  - To support transaction over replication, we wrap the transaction
  with BEGIN/COMMIT or BEGIN/ROLLBACK in the binary log.
  We want to write a BEGIN/ROLLBACK block when a non-transactional table
  was updated in a transaction which was rolled back. This is to ensure
  that the same updates are run on the slave.

  @param thd
  @param cache		The cache to copy to the binlog
  @param commit_event   The commit event to print after writing the
4861
                        contents of the cache.
4862 4863 4864
  @param incident       Defines if an incident event should be created to
                        notify that some non-transactional changes did
                        not get into the binlog.
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4865

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4866 4867 4868 4869 4870 4871
  @note
    We only come here if there is something in the cache.
  @note
    The thing in the cache is always a complete transaction.
  @note
    'cache' needs to be reinitialized after this functions returns.
4872 4873
*/

4874 4875
bool MYSQL_BIN_LOG::write(THD *thd, IO_CACHE *cache, Log_event *commit_event,
                          bool incident)
4876
{
4877
  DBUG_ENTER("MYSQL_BIN_LOG::write(THD *, IO_CACHE *, Log_event *)");
4878
  VOID(pthread_mutex_lock(&LOCK_log));
4879

4880 4881 4882
  /* NULL would represent nothing to replicate after ROLLBACK */
  DBUG_ASSERT(commit_event != NULL);

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4883
  DBUG_ASSERT(is_open());
4884
  if (likely(is_open()))                       // Should always be true
4885
  {
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4886
    /*
4887 4888 4889 4890
      We only bother to write to the binary log if there is anything
      to write.
     */
    if (my_b_tell(cache) > 0)
4891
    {
4892
      /*
4893 4894 4895
        Log "BEGIN" at the beginning of every transaction.  Here, a
        transaction is either a BEGIN..COMMIT block or a single
        statement in autocommit mode.
4896
      */
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4897
      Query_log_event qinfo(thd, STRING_WITH_LEN("BEGIN"), TRUE, TRUE, 0);
4898

4899 4900 4901 4902 4903 4904 4905 4906 4907 4908 4909 4910 4911 4912 4913 4914 4915
      /*
        Now this Query_log_event has artificial log_pos 0. It must be
        adjusted to reflect the real position in the log. Not doing it
        would confuse the slave: it would prevent this one from
        knowing where he is in the master's binlog, which would result
        in wrong positions being shown to the user, MASTER_POS_WAIT
        undue waiting etc.
      */
      if (qinfo.write(&log_file))
        goto err;

      DBUG_EXECUTE_IF("crash_before_writing_xid",
                      {
                        if ((write_error= write_cache(cache, false, true)))
                          DBUG_PRINT("info", ("error writing binlog cache: %d",
                                               write_error));
                        DBUG_PRINT("info", ("crashing before writing xid"));
4916
                        DBUG_SUICIDE();
4917
                      });
4918

4919 4920
      if ((write_error= write_cache(cache, false, false)))
        goto err;
4921

4922 4923
      if (commit_event && commit_event->write(&log_file))
        goto err;
4924 4925 4926 4927

      if (incident && write_incident(thd, FALSE))
        goto err;

4928 4929
      if (flush_and_sync())
        goto err;
4930
      DBUG_EXECUTE_IF("half_binlogged_transaction", DBUG_SUICIDE(););
4931 4932 4933 4934 4935 4936 4937
      if (cache->error)				// Error on read
      {
        sql_print_error(ER(ER_ERROR_ON_READ), cache->file_name, errno);
        write_error=1;				// Don't give more errors
        goto err;
      }
      signal_update();
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4938
    }
4939

4940 4941 4942 4943 4944 4945 4946 4947
    /*
      if commit_event is Xid_log_event, increase the number of
      prepared_xids (it's decreasd in ::unlog()). Binlog cannot be rotated
      if there're prepared xids in it - see the comment in new_file() for
      an explanation.
      If the commit_event is not Xid_log_event (then it's a Query_log_event)
      rotate binlog, if necessary.
    */
4948
    if (commit_event && commit_event->get_type_code() == XID_EVENT)
4949 4950 4951 4952 4953
    {
      pthread_mutex_lock(&LOCK_prep_xids);
      prepared_xids++;
      pthread_mutex_unlock(&LOCK_prep_xids);
    }
4954
    else
4955 4956
      if (rotate_and_purge(RP_LOCK_LOG_IS_ALREADY_LOCKED))
        goto err;
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4957
  }
4958
  VOID(pthread_mutex_unlock(&LOCK_log));
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4959

4960
  DBUG_RETURN(0);
4961 4962

err:
4963 4964 4965 4966 4967
  if (!write_error)
  {
    write_error= 1;
    sql_print_error(ER(ER_ERROR_ON_WRITE), name, errno);
  }
4968
  VOID(pthread_mutex_unlock(&LOCK_log));
4969
  DBUG_RETURN(1);
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4970 4971
}

4972

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4973 4974
/**
  Wait until we get a signal that the binary log has been updated.
4975

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4976 4977 4978 4979
  @param thd		Thread variable
  @param is_slave      If 0, the caller is the Binlog_dump thread from master;
                       if 1, the caller is the SQL thread from the slave. This
                       influences only thd->proc_info.
4980

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4981
  @note
4982
    One must have a lock on LOCK_log before calling this function.
4983
    This lock will be released before return! That's required by
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4984
    THD::enter_cond() (see NOTES in sql_class.h).
4985 4986
*/

4987
void MYSQL_BIN_LOG::wait_for_update(THD* thd, bool is_slave)
4988
{
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4989 4990
  const char *old_msg;
  DBUG_ENTER("wait_for_update");
4991

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4992
  old_msg= thd->enter_cond(&update_cond, &LOCK_log,
4993
                           is_slave ?
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4994
                           "Has read all relay log; waiting for the slave I/O "
4995
                           "thread to update it" :
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4996
                           "Has sent all binlog to slave; waiting for binlog "
4997
                           "to be updated");
4998 4999
  pthread_cond_wait(&update_cond, &LOCK_log);
  thd->exit_cond(old_msg);
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5000
  DBUG_VOID_RETURN;
5001
}
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5002

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5003

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5004 5005
/**
  Close the log file.
5006

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5007 5008 5009 5010 5011
  @param exiting     Bitmask for one or more of the following bits:
          - LOG_CLOSE_INDEX : if we should close the index file
          - LOG_CLOSE_TO_BE_OPENED : if we intend to call open
                                     at once after close.
          - LOG_CLOSE_STOP_EVENT : write a 'stop' event to the log
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5012

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5013
  @note
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5014 5015
    One can do an open on the object at once after doing a close.
    The internal structures are not freed until cleanup() is called
5016 5017
*/

5018
void MYSQL_BIN_LOG::close(uint exiting)
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5019
{					// One can't set log_type here!
5020
  DBUG_ENTER("MYSQL_BIN_LOG::close");
5021
  DBUG_PRINT("enter",("exiting: %d", (int) exiting));
5022
  if (log_state == LOG_OPENED)
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5023
  {
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SCRUM  
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5024
#ifdef HAVE_REPLICATION
5025 5026
    if (log_type == LOG_BIN && !no_auto_events &&
	(exiting & LOG_CLOSE_STOP_EVENT))
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5027 5028
    {
      Stop_log_event s;
5029
      s.write(&log_file);
5030
      bytes_written+= s.data_written;
5031
      signal_update();
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5032
    }
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SCRUM  
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5033
#endif /* HAVE_REPLICATION */
5034 5035

    /* don't pwrite in a file opened with O_APPEND - it doesn't work */
5036
    if (log_file.type == WRITE_CACHE && log_type == LOG_BIN)
5037 5038
    {
      my_off_t offset= BIN_LOG_HEADER_SIZE + FLAGS_OFFSET;
5039 5040
      my_off_t org_position= my_tell(log_file.file, MYF(0));
      uchar flags= 0;            // clearing LOG_EVENT_BINLOG_IN_USE_F
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5041
      my_pwrite(log_file.file, &flags, 1, offset, MYF(0));
5042 5043 5044 5045 5046 5047 5048
      /*
        Restore position so that anything we have in the IO_cache is written
        to the correct position.
        We need the seek here, as my_pwrite() is not guaranteed to keep the
        original position on system that doesn't support pwrite().
      */
      my_seek(log_file.file, org_position, MY_SEEK_SET, MYF(0));
5049 5050
    }

5051 5052
    /* this will cleanup IO_CACHE, sync and close the file */
    MYSQL_LOG::close(exiting);
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5053
  }
5054 5055 5056 5057 5058 5059

  /*
    The following test is needed even if is_open() is not set, as we may have
    called a not complete close earlier and the index file is still open.
  */

5060
  if ((exiting & LOG_CLOSE_INDEX) && my_b_inited(&index_file))
5061
  {
5062 5063
    end_io_cache(&index_file);
    if (my_close(index_file.file, MYF(0)) < 0 && ! write_error)
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5064
    {
5065 5066
      write_error= 1;
      sql_print_error(ER(ER_ERROR_ON_WRITE), index_file_name, errno);
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5067
    }
5068
  }
5069
  log_state= (exiting & LOG_CLOSE_TO_BE_OPENED) ? LOG_TO_BE_OPENED : LOG_CLOSED;
5070
  safeFree(name);
5071
  DBUG_VOID_RETURN;
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5072 5073 5074
}


5075
void MYSQL_BIN_LOG::set_max_size(ulong max_size_arg)
5076 5077 5078 5079 5080 5081 5082 5083
{
  /*
    We need to take locks, otherwise this may happen:
    new_file() is called, calls open(old_max_size), then before open() starts,
    set_max_size() sets max_size to max_size_arg, then open() starts and
    uses the old_max_size argument, so max_size_arg has been overwritten and
    it's like if the SET command was never run.
  */
5084
  DBUG_ENTER("MYSQL_BIN_LOG::set_max_size");
unknown's avatar
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5085
  pthread_mutex_lock(&LOCK_log);
5086 5087
  if (is_open())
    max_size= max_size_arg;
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5088 5089
  pthread_mutex_unlock(&LOCK_log);
  DBUG_VOID_RETURN;
5090
}
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5091

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5092

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5093 5094
/**
  Check if a string is a valid number.
5095

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5096 5097 5098
  @param str			String to test
  @param res			Store value here
  @param allow_wildcards	Set to 1 if we should ignore '%' and '_'
5099

unknown's avatar
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5100
  @note
5101 5102 5103
    For the moment the allow_wildcards argument is not used
    Should be move to some other file.

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5104
  @retval
5105
    1	String is a number
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5106
  @retval
5107
    0	Error
5108
*/
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5109 5110 5111 5112 5113 5114 5115 5116 5117 5118 5119 5120

static bool test_if_number(register const char *str,
			   long *res, bool allow_wildcards)
{
  reg2 int flag;
  const char *start;
  DBUG_ENTER("test_if_number");

  flag=0; start=str;
  while (*str++ == ' ') ;
  if (*--str == '-' || *str == '+')
    str++;
5121 5122
  while (my_isdigit(files_charset_info,*str) ||
	 (allow_wildcards && (*str == wild_many || *str == wild_one)))
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5123 5124 5125 5126 5127 5128 5129
  {
    flag=1;
    str++;
  }
  if (*str == '.')
  {
    for (str++ ;
5130
	 my_isdigit(files_charset_info,*str) ||
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5131 5132 5133 5134 5135 5136 5137 5138 5139 5140 5141 5142 5143 5144 5145 5146 5147 5148 5149
	   (allow_wildcards && (*str == wild_many || *str == wild_one)) ;
	 str++, flag=1) ;
  }
  if (*str != 0 || flag == 0)
    DBUG_RETURN(0);
  if (res)
    *res=atol(start);
  DBUG_RETURN(1);			/* Number ok */
} /* test_if_number */


void sql_perror(const char *message)
{
#ifdef HAVE_STRERROR
  sql_print_error("%s: %s",message, strerror(errno));
#else
  perror(message);
#endif
}
5150

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5151

5152 5153 5154 5155 5156
#ifdef __WIN__
extern "C" my_bool reopen_fstreams(const char *filename,
                                   FILE *outstream, FILE *errstream)
{
  int handle_fd;
5157
  int err_fd, out_fd;
5158 5159
  HANDLE osfh;

5160 5161 5162 5163 5164 5165 5166 5167 5168 5169 5170 5171 5172 5173 5174 5175 5176 5177 5178 5179 5180 5181 5182
  DBUG_ASSERT(filename && errstream);

  // Services don't have stdout/stderr on Windows, so _fileno returns -1.
  err_fd= _fileno(errstream);
  if (err_fd < 0)
  {
    if (!freopen(filename, "a+", errstream))
      return TRUE;

    setbuf(errstream, NULL);
    err_fd= _fileno(errstream);
  }

  if (outstream)
  {
    out_fd= _fileno(outstream);
    if (out_fd < 0)
    {
      if (!freopen(filename, "a+", outstream))
        return TRUE;
      out_fd= _fileno(outstream);
    }
  }
5183 5184 5185 5186 5187 5188 5189 5190 5191 5192 5193 5194 5195 5196 5197

  if ((osfh= CreateFile(filename, GENERIC_READ | GENERIC_WRITE,
                        FILE_SHARE_READ | FILE_SHARE_WRITE |
                        FILE_SHARE_DELETE, NULL,
                        OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL,
                        NULL)) == INVALID_HANDLE_VALUE)
    return TRUE;

  if ((handle_fd= _open_osfhandle((intptr_t)osfh,
                                  _O_APPEND | _O_TEXT)) == -1)
  {
    CloseHandle(osfh);
    return TRUE;
  }

5198
  if (_dup2(handle_fd, err_fd) < 0)
5199
  {
5200 5201
    CloseHandle(osfh);
    return TRUE;
5202 5203
  }

5204
  if (outstream && _dup2(handle_fd, out_fd) < 0)
5205
  {
5206 5207
    CloseHandle(osfh);
    return TRUE;
5208 5209 5210 5211 5212 5213 5214 5215 5216 5217 5218 5219 5220 5221 5222 5223 5224 5225 5226 5227
  }

  _close(handle_fd);
  return FALSE;
}
#else
extern "C" my_bool reopen_fstreams(const char *filename,
                                   FILE *outstream, FILE *errstream)
{
  if (outstream && !freopen(filename, "a+", outstream))
    return TRUE;

  if (errstream && !freopen(filename, "a+", errstream))
    return TRUE;

  return FALSE;
}
#endif


5228 5229 5230 5231 5232 5233
/*
  Unfortunately, there seems to be no good way
  to restore the original streams upon failure.
*/
static bool redirect_std_streams(const char *file)
{
5234 5235
  if (reopen_fstreams(file, stdout, stderr))
    return TRUE;
5236

5237 5238
  setbuf(stderr, NULL);
  return FALSE;
5239 5240 5241
}


unknown's avatar
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5242 5243
bool flush_error_log()
{
5244
  bool result= 0;
5245
  if (opt_error_log)
unknown's avatar
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5246
  {
unknown's avatar
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5247
    VOID(pthread_mutex_lock(&LOCK_error_log));
5248 5249
    if (redirect_std_streams(log_error_file))
      result= 1;
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5250
    VOID(pthread_mutex_unlock(&LOCK_error_log));
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5251
  }
5252
  return result;
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5253
}
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5254

5255
void MYSQL_BIN_LOG::signal_update()
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5256
{
5257
  DBUG_ENTER("MYSQL_BIN_LOG::signal_update");
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5258 5259 5260 5261
  pthread_cond_broadcast(&update_cond);
  DBUG_VOID_RETURN;
}

5262
#ifdef __NT__
5263
static void print_buffer_to_nt_eventlog(enum loglevel level, char *buff,
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5264
                                        size_t length, size_t buffLen)
5265 5266
{
  HANDLE event;
5267
  char   *buffptr= buff;
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5268
  DBUG_ENTER("print_buffer_to_nt_eventlog");
5269

5270 5271
  /* Add ending CR/LF's to string, overwrite last chars if necessary */
  strmov(buffptr+min(length, buffLen-5), "\r\n\r\n");
5272

unknown's avatar
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5273 5274
  setup_windows_event_source();
  if ((event= RegisterEventSource(NULL,"MySQL")))
5275
  {
unknown's avatar
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5276
    switch (level) {
5277
      case ERROR_LEVEL:
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5278
        ReportEvent(event, EVENTLOG_ERROR_TYPE, 0, MSG_DEFAULT, NULL, 1, 0,
5279
                    (LPCSTR*)&buffptr, NULL);
5280 5281
        break;
      case WARNING_LEVEL:
unknown's avatar
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5282
        ReportEvent(event, EVENTLOG_WARNING_TYPE, 0, MSG_DEFAULT, NULL, 1, 0,
5283
                    (LPCSTR*) &buffptr, NULL);
5284 5285
        break;
      case INFORMATION_LEVEL:
unknown's avatar
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5286
        ReportEvent(event, EVENTLOG_INFORMATION_TYPE, 0, MSG_DEFAULT, NULL, 1,
5287
                    0, (LPCSTR*) &buffptr, NULL);
5288 5289 5290 5291 5292 5293 5294
        break;
    }
    DeregisterEventSource(event);
  }

  DBUG_VOID_RETURN;
}
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5295 5296
#endif /* __NT__ */

5297

5298
#ifndef EMBEDDED_LIBRARY
5299 5300
static void print_buffer_to_file(enum loglevel level, const char *buffer,
                                 size_t length)
5301 5302 5303 5304 5305 5306 5307 5308 5309
{
  time_t skr;
  struct tm tm_tmp;
  struct tm *start;
  DBUG_ENTER("print_buffer_to_file");
  DBUG_PRINT("enter",("buffer: %s", buffer));

  VOID(pthread_mutex_lock(&LOCK_error_log));

5310
  skr= my_time(0);
5311 5312
  localtime_r(&skr, &tm_tmp);
  start=&tm_tmp;
5313

5314
  fprintf(stderr, "%02d%02d%02d %2d:%02d:%02d [%s] %.*s\n",
5315 5316 5317 5318 5319 5320 5321 5322
          start->tm_year % 100,
          start->tm_mon+1,
          start->tm_mday,
          start->tm_hour,
          start->tm_min,
          start->tm_sec,
          (level == ERROR_LEVEL ? "ERROR" : level == WARNING_LEVEL ?
           "Warning" : "Note"),
5323
          (int) length, buffer);
5324 5325 5326 5327 5328 5329 5330

  fflush(stderr);

  VOID(pthread_mutex_unlock(&LOCK_error_log));
  DBUG_VOID_RETURN;
}

5331 5332 5333
/**
  Prints a printf style message to the error log and, under NT, to the
  Windows event log.
5334

5335 5336 5337 5338 5339 5340 5341 5342 5343 5344 5345 5346
  This function prints the message into a buffer and then sends that buffer
  to other functions to write that message to other logging sources.

  @param level          The level of the msg significance
  @param format         Printf style format of message
  @param args           va_list list of arguments for the message

  @returns
    The function always returns 0. The return value is present in the
    signature to be compatible with other logging routines, which could
    return an error (e.g. logging to the log tables)
*/
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5347
int vprint_msg_to_log(enum loglevel level, const char *format, va_list args)
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5348 5349
{
  char   buff[1024];
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5350
  size_t length;
5351
  DBUG_ENTER("vprint_msg_to_log");
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5352

5353
  length= my_vsnprintf(buff, sizeof(buff), format, args);
5354
  print_buffer_to_file(level, buff, length);
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5355 5356

#ifdef __NT__
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5357
  print_buffer_to_nt_eventlog(level, buff, length, sizeof(buff));
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5358
#endif
5359

5360
  DBUG_RETURN(0);
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5361
}
5362
#endif /* EMBEDDED_LIBRARY */
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5363

5364

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5365
void sql_print_error(const char *format, ...) 
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5366 5367
{
  va_list args;
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5368
  DBUG_ENTER("sql_print_error");
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5369

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5370
  va_start(args, format);
5371
  error_log_print(ERROR_LEVEL, format, args);
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5372
  va_end(args);
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5373 5374 5375 5376 5377

  DBUG_VOID_RETURN;
}


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5378
void sql_print_warning(const char *format, ...) 
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5379 5380
{
  va_list args;
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5381
  DBUG_ENTER("sql_print_warning");
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5382

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5383
  va_start(args, format);
5384
  error_log_print(WARNING_LEVEL, format, args);
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5385
  va_end(args);
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5386 5387 5388 5389 5390

  DBUG_VOID_RETURN;
}


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5391
void sql_print_information(const char *format, ...) 
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{
  va_list args;
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5394
  DBUG_ENTER("sql_print_information");
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5395

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5396
  va_start(args, format);
5397
  error_log_print(INFORMATION_LEVEL, format, args);
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5398
  va_end(args);
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5399

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5400 5401
  DBUG_VOID_RETURN;
}
5402

5403

5404 5405 5406 5407 5408 5409 5410 5411
/********* transaction coordinator log for 2pc - mmap() based solution *******/

/*
  the log consists of a file, mmapped to a memory.
  file is divided on pages of tc_log_page_size size.
  (usable size of the first page is smaller because of log header)
  there's PAGE control structure for each page
  each page (or rather PAGE control structure) can be in one of three
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  states - active, syncing, pool.
  there could be only one page in active or syncing states,
5414
  but many in pool - pool is fifo queue.
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  usual lifecycle of a page is pool->active->syncing->pool
5416
  "active" page - is a page where new xid's are logged.
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  the page stays active as long as syncing slot is taken.
  "syncing" page is being synced to disk. no new xid can be added to it.
5419
  when the sync is done the page is moved to a pool and an active page
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  becomes "syncing".

  the result of such an architecture is a natural "commit grouping" -
  If commits are coming faster than the system can sync, they do not
  stall. Instead, all commit that came since the last sync are
  logged to the same page, and they all are synced with the next -
  one - sync. Thus, thought individual commits are delayed, throughput
  is not decreasing.

  when a xid is added to an active page, the thread of this xid waits
  for a page's condition until the page is synced. when syncing slot
  becomes vacant one of these waiters is awaken to take care of syncing.
  it syncs the page and signals all waiters that the page is synced.
5433 5434 5435 5436
  PAGE::waiters is used to count these waiters, and a page may never
  become active again until waiters==0 (that is all waiters from the
  previous sync have noticed the sync was completed)

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  note, that the page becomes "dirty" and has to be synced only when a
  new xid is added into it. Removing a xid from a page does not make it
5439 5440
  dirty - we don't sync removals to disk.
*/
5441 5442 5443 5444 5445

ulong tc_log_page_waits= 0;

#ifdef HAVE_MMAP

5446 5447
#define TC_LOG_HEADER_SIZE (sizeof(tc_log_magic)+1)

5448
static const char tc_log_magic[]={(char) 254, 0x23, 0x05, 0x74};
5449

5450
ulong opt_tc_log_size= TC_LOG_MIN_SIZE;
5451
ulong tc_log_max_pages_used=0, tc_log_page_size=0, tc_log_cur_pages_used=0;
5452 5453 5454 5455 5456 5457 5458

int TC_LOG_MMAP::open(const char *opt_name)
{
  uint i;
  bool crashed=FALSE;
  PAGE *pg;

5459
  DBUG_ASSERT(total_ha_2pc > 1);
5460 5461
  DBUG_ASSERT(opt_name && opt_name[0]);

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  tc_log_page_size= my_getpagesize();
5463 5464 5465
  DBUG_ASSERT(TC_LOG_PAGE_SIZE % tc_log_page_size == 0);

  fn_format(logname,opt_name,mysql_data_home,"",MY_UNPACK_FILENAME);
5466
  if ((fd= my_open(logname, O_RDWR, MYF(0))) < 0)
5467
  {
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    if (my_errno != ENOENT)
      goto err;
5470 5471
    if (using_heuristic_recover())
      return 1;
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    if ((fd= my_create(logname, CREATE_MODE, O_RDWR, MYF(MY_WME))) < 0)
5473 5474
      goto err;
    inited=1;
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    file_length= opt_tc_log_size;
5476 5477 5478 5479 5480
    if (my_chsize(fd, file_length, 0, MYF(MY_WME)))
      goto err;
  }
  else
  {
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    inited= 1;
    crashed= TRUE;
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    sql_print_information("Recovering after a crash using %s", opt_name);
5484 5485 5486 5487 5488 5489
    if (tc_heuristic_recover)
    {
      sql_print_error("Cannot perform automatic crash recovery when "
                      "--tc-heuristic-recover is used");
      goto err;
    }
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    file_length= my_seek(fd, 0L, MY_SEEK_END, MYF(MY_WME+MY_FAE));
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    if (file_length == MY_FILEPOS_ERROR || file_length % tc_log_page_size)
      goto err;
  }

5495
  data= (uchar *)my_mmap(0, (size_t)file_length, PROT_READ|PROT_WRITE,
5496 5497 5498 5499 5500 5501 5502 5503
                        MAP_NOSYNC|MAP_SHARED, fd, 0);
  if (data == MAP_FAILED)
  {
    my_errno=errno;
    goto err;
  }
  inited=2;

5504
  npages=(uint)file_length/tc_log_page_size;
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  DBUG_ASSERT(npages >= 3);             // to guarantee non-empty pool
  if (!(pages=(PAGE *)my_malloc(npages*sizeof(PAGE), MYF(MY_WME|MY_ZEROFILL))))
    goto err;
  inited=3;
  for (pg=pages, i=0; i < npages; i++, pg++)
  {
    pg->next=pg+1;
    pg->waiters=0;
    pg->state=POOL;
    pthread_mutex_init(&pg->lock, MY_MUTEX_INIT_FAST);
    pthread_cond_init (&pg->cond, 0);
    pg->start=(my_xid *)(data + i*tc_log_page_size);
    pg->end=(my_xid *)(pg->start + tc_log_page_size);
    pg->size=pg->free=tc_log_page_size/sizeof(my_xid);
  }
  pages[0].size=pages[0].free=
                (tc_log_page_size-TC_LOG_HEADER_SIZE)/sizeof(my_xid);
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  pages[0].start=pages[0].end-pages[0].size;
5523 5524 5525
  pages[npages-1].next=0;
  inited=4;

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  if (crashed && recover())
5527
      goto err;
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5528

5529
  memcpy(data, tc_log_magic, sizeof(tc_log_magic));
5530
  data[sizeof(tc_log_magic)]= (uchar)total_ha_2pc;
5531 5532 5533 5534 5535 5536 5537 5538 5539 5540 5541
  my_msync(fd, data, tc_log_page_size, MS_SYNC);
  inited=5;

  pthread_mutex_init(&LOCK_sync,    MY_MUTEX_INIT_FAST);
  pthread_mutex_init(&LOCK_active,  MY_MUTEX_INIT_FAST);
  pthread_mutex_init(&LOCK_pool,    MY_MUTEX_INIT_FAST);
  pthread_cond_init(&COND_active, 0);
  pthread_cond_init(&COND_pool, 0);

  inited=6;

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5542
  syncing= 0;
5543 5544 5545 5546 5547 5548 5549 5550 5551 5552 5553
  active=pages;
  pool=pages+1;
  pool_last=pages+npages-1;

  return 0;

err:
  close();
  return 1;
}

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5554 5555
/**
  there is no active page, let's got one from the pool.
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5556

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5557 5558 5559
  Two strategies here:
    -# take the first from the pool
    -# if there're waiters - take the one with the most free space.
5560

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  @todo
    TODO page merging. try to allocate adjacent page first,
    so that they can be flushed both in one sync
5564
*/
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5565

5566 5567 5568 5569 5570
void TC_LOG_MMAP::get_active_from_pool()
{
  PAGE **p, **best_p=0;
  int best_free;

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  if (syncing)
    pthread_mutex_lock(&LOCK_pool);

5574 5575 5576
  do
  {
    best_p= p= &pool;
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5577 5578
    if ((*p)->waiters == 0) // can the first page be used ?
      break;                // yes - take it.
5579

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5580
    best_free=0;            // no - trying second strategy
5581 5582 5583 5584 5585 5586 5587 5588 5589 5590 5591 5592
    for (p=&(*p)->next; *p; p=&(*p)->next)
    {
      if ((*p)->waiters == 0 && (*p)->free > best_free)
      {
        best_free=(*p)->free;
        best_p=p;
      }
    }
  }
  while ((*best_p == 0 || best_free == 0) && overflow());

  active=*best_p;
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5593
  if (active->free == active->size) // we've chosen an empty page
5594 5595 5596 5597 5598
  {
    tc_log_cur_pages_used++;
    set_if_bigger(tc_log_max_pages_used, tc_log_cur_pages_used);
  }

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5599
  if ((*best_p)->next)              // unlink the page from the pool
5600 5601 5602
    *best_p=(*best_p)->next;
  else
    pool_last=*best_p;
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  if (syncing)
    pthread_mutex_unlock(&LOCK_pool);
5606 5607
}

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5608 5609 5610 5611
/**
  @todo
  perhaps, increase log size ?
*/
5612 5613 5614 5615 5616 5617 5618 5619 5620
int TC_LOG_MMAP::overflow()
{
  /*
    simple overflow handling - just wait
    TODO perhaps, increase log size ?
    let's check the behaviour of tc_log_page_waits first
  */
  tc_log_page_waits++;
  pthread_cond_wait(&COND_pool, &LOCK_pool);
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  return 1; // always return 1
5622 5623
}

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5624 5625
/**
  Record that transaction XID is committed on the persistent storage.
5626 5627 5628 5629 5630 5631 5632 5633 5634 5635 5636 5637 5638 5639 5640

    This function is called in the middle of two-phase commit:
    First all resources prepare the transaction, then tc_log->log() is called,
    then all resources commit the transaction, then tc_log->unlog() is called.

    All access to active page is serialized but it's not a problem, as
    we're assuming that fsync() will be a main bottleneck.
    That is, parallelizing writes to log pages we'll decrease number of
    threads waiting for a page, but then all these threads will be waiting
    for a fsync() anyway

   If tc_log == MYSQL_LOG then tc_log writes transaction to binlog and
   records XID in a special Xid_log_event.
   If tc_log = TC_LOG_MMAP then xid is written in a special memory-mapped
   log.
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5641

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5642 5643 5644 5645 5646 5647 5648
  @retval
    0  - error
  @retval
    \# - otherwise, "cookie", a number that will be passed as an argument
    to unlog() call. tc_log can define it any way it wants,
    and use for whatever purposes. TC_LOG_MMAP sets it
    to the position in memory where xid was logged to.
5649 5650
*/

5651
int TC_LOG_MMAP::log_xid(THD *thd, my_xid xid)
5652 5653 5654 5655 5656 5657 5658
{
  int err;
  PAGE *p;
  ulong cookie;

  pthread_mutex_lock(&LOCK_active);

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  /*
    if active page is full - just wait...
    frankly speaking, active->free here accessed outside of mutex
    protection, but it's safe, because it only means we may miss an
    unlog() for the active page, and we're not waiting for it here -
    unlog() does not signal COND_active.
  */
5666 5667 5668
  while (unlikely(active && active->free == 0))
    pthread_cond_wait(&COND_active, &LOCK_active);

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  /* no active page ? take one from the pool */
5670 5671 5672 5673 5674 5675
  if (active == 0)
    get_active_from_pool();

  p=active;
  pthread_mutex_lock(&p->lock);

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5676
  /* searching for an empty slot */
5677 5678 5679 5680 5681 5682
  while (*p->ptr)
  {
    p->ptr++;
    DBUG_ASSERT(p->ptr < p->end);               // because p->free > 0
  }

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  /* found! store xid there and mark the page dirty */
  cookie= (ulong)((uchar *)p->ptr - data);      // can never be zero
5685 5686 5687 5688 5689
  *p->ptr++= xid;
  p->free--;
  p->state= DIRTY;

  /* to sync or not to sync - this is the question */
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5690
  pthread_mutex_unlock(&LOCK_active);
5691 5692 5693
  pthread_mutex_lock(&LOCK_sync);
  pthread_mutex_unlock(&p->lock);

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5694
  if (syncing)
5695 5696
  {                                          // somebody's syncing. let's wait
    p->waiters++;
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5697
    /*
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5698
      note - it must be while (), not do ... while () here
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5699 5700 5701
      as p->state may be not DIRTY when we come here
    */
    while (p->state == DIRTY && syncing)
5702 5703 5704 5705 5706 5707 5708 5709 5710 5711 5712
      pthread_cond_wait(&p->cond, &LOCK_sync);
    p->waiters--;
    err= p->state == ERROR;
    if (p->state != DIRTY)                   // page was synced
    {
      if (p->waiters == 0)
        pthread_cond_signal(&COND_pool);     // in case somebody's waiting
      pthread_mutex_unlock(&LOCK_sync);
      goto done;                             // we're done
    }
  }                                          // page was not synced! do it now
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  DBUG_ASSERT(active == p && syncing == 0);
  pthread_mutex_lock(&LOCK_active);
  syncing=p;                                 // place is vacant - take it
  active=0;                                  // page is not active anymore
5717 5718 5719 5720 5721 5722 5723 5724 5725 5726 5727 5728 5729
  pthread_cond_broadcast(&COND_active);      // in case somebody's waiting
  pthread_mutex_unlock(&LOCK_active);
  pthread_mutex_unlock(&LOCK_sync);
  err= sync();

done:
  return err ? 0 : cookie;
}

int TC_LOG_MMAP::sync()
{
  int err;

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5730
  DBUG_ASSERT(syncing != active);
5731 5732 5733 5734 5735

  /*
    sit down and relax - this can take a while...
    note - no locks are held at this point
  */
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5736
  err= my_msync(fd, syncing->start, 1, MS_SYNC);
5737

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5738
  /* page is synced. let's move it to the pool */
5739
  pthread_mutex_lock(&LOCK_pool);
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  pool_last->next=syncing;
  pool_last=syncing;
  syncing->next=0;
  syncing->state= err ? ERROR : POOL;
  pthread_cond_broadcast(&syncing->cond);    // signal "sync done"
5745 5746 5747
  pthread_cond_signal(&COND_pool);           // in case somebody's waiting
  pthread_mutex_unlock(&LOCK_pool);

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5748
  /* marking 'syncing' slot free */
5749
  pthread_mutex_lock(&LOCK_sync);
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5750
  syncing=0;
5751 5752 5753 5754 5755
  pthread_cond_signal(&active->cond);        // wake up a new syncer
  pthread_mutex_unlock(&LOCK_sync);
  return err;
}

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5756
/**
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5757
  erase xid from the page, update page free space counters/pointers.
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5758
  cookie points directly to the memory where xid was logged.
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5759
*/
5760

5761
int TC_LOG_MMAP::unlog(ulong cookie, my_xid xid)
5762 5763 5764 5765 5766 5767 5768 5769 5770 5771 5772 5773
{
  PAGE *p=pages+(cookie/tc_log_page_size);
  my_xid *x=(my_xid *)(data+cookie);

  DBUG_ASSERT(*x == xid);
  DBUG_ASSERT(x >= p->start && x < p->end);
  *x=0;

  pthread_mutex_lock(&p->lock);
  p->free++;
  DBUG_ASSERT(p->free <= p->size);
  set_if_smaller(p->ptr, x);
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5774
  if (p->free == p->size)               // the page is completely empty
5775 5776
    statistic_decrement(tc_log_cur_pages_used, &LOCK_status);
  if (p->waiters == 0)                 // the page is in pool and ready to rock
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5777
    pthread_cond_signal(&COND_pool);   // ping ... for overflow()
5778
  pthread_mutex_unlock(&p->lock);
5779
  return 0;
5780 5781 5782 5783
}

void TC_LOG_MMAP::close()
{
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5784
  uint i;
5785 5786 5787 5788 5789 5790 5791 5792 5793
  switch (inited) {
  case 6:
    pthread_mutex_destroy(&LOCK_sync);
    pthread_mutex_destroy(&LOCK_active);
    pthread_mutex_destroy(&LOCK_pool);
    pthread_cond_destroy(&COND_pool);
  case 5:
    data[0]='A'; // garble the first (signature) byte, in case my_delete fails
  case 4:
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5794
    for (i=0; i < npages; i++)
5795 5796 5797 5798 5799 5800 5801
    {
      if (pages[i].ptr == 0)
        break;
      pthread_mutex_destroy(&pages[i].lock);
      pthread_cond_destroy(&pages[i].cond);
    }
  case 3:
5802
    my_free((uchar*)pages, MYF(0));
5803
  case 2:
5804
    my_munmap((char*)data, (size_t)file_length);
5805 5806 5807 5808 5809 5810 5811 5812 5813 5814 5815 5816 5817 5818 5819 5820 5821 5822 5823 5824 5825 5826 5827 5828 5829
  case 1:
    my_close(fd, MYF(0));
  }
  if (inited>=5) // cannot do in the switch because of Windows
    my_delete(logname, MYF(MY_WME));
  inited=0;
}

int TC_LOG_MMAP::recover()
{
  HASH xids;
  PAGE *p=pages, *end_p=pages+npages;

  if (memcmp(data, tc_log_magic, sizeof(tc_log_magic)))
  {
    sql_print_error("Bad magic header in tc log");
    goto err1;
  }

  /*
    the first byte after magic signature is set to current
    number of storage engines on startup
  */
  if (data[sizeof(tc_log_magic)] != total_ha_2pc)
  {
5830
    sql_print_error("Recovery failed! You must enable "
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5831 5832 5833
                    "exactly %d storage engines that support "
                    "two-phase commit protocol",
                    data[sizeof(tc_log_magic)]);
5834 5835 5836 5837
    goto err1;
  }

  if (hash_init(&xids, &my_charset_bin, tc_log_page_size/3, 0,
5838
                sizeof(my_xid), 0, 0, MYF(0)))
5839 5840 5841 5842 5843
    goto err1;

  for ( ; p < end_p ; p++)
  {
    for (my_xid *x=p->start; x < p->end; x++)
5844
      if (*x && my_hash_insert(&xids, (uchar *)x))
5845 5846 5847 5848 5849 5850 5851
        goto err2; // OOM
  }

  if (ha_recover(&xids))
    goto err2;

  hash_free(&xids);
5852
  bzero(data, (size_t)file_length);
5853 5854 5855 5856 5857 5858 5859 5860 5861 5862 5863
  return 0;

err2:
  hash_free(&xids);
err1:
  sql_print_error("Crash recovery failed. Either correct the problem "
                  "(if it's, for example, out of memory error) and restart, "
                  "or delete tc log and start mysqld with "
                  "--tc-heuristic-recover={commit|rollback}");
  return 1;
}
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5864 5865 5866 5867 5868
#endif

TC_LOG *tc_log;
TC_LOG_DUMMY tc_log_dummy;
TC_LOG_MMAP  tc_log_mmap;
5869

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5870 5871
/**
  Perform heuristic recovery, if --tc-heuristic-recover was used.
5872

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5873
  @note
5874 5875
    no matter whether heuristic recovery was successful or not
    mysqld must exit. So, return value is the same in both cases.
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  @retval
    0	no heuristic recovery was requested
  @retval
    1   heuristic recovery was performed
5881 5882
*/

5883 5884 5885 5886 5887 5888 5889 5890 5891 5892 5893 5894 5895
int TC_LOG::using_heuristic_recover()
{
  if (!tc_heuristic_recover)
    return 0;

  sql_print_information("Heuristic crash recovery mode");
  if (ha_recover(0))
    sql_print_error("Heuristic crash recovery failed");
  sql_print_information("Please restart mysqld without --tc-heuristic-recover");
  return 1;
}

/****** transaction coordinator log for 2pc - binlog() based solution ******/
5896
#define TC_LOG_BINLOG MYSQL_BIN_LOG
5897

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5898 5899 5900
/**
  @todo
  keep in-memory list of prepared transactions
5901 5902 5903 5904 5905
  (add to list in log(), remove on unlog())
  and copy it to the new binlog if rotated
  but let's check the behaviour of tc_log_page_waits first!
*/

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5906
int TC_LOG_BINLOG::open(const char *opt_name)
5907
{
5908 5909
  LOG_INFO log_info;
  int      error= 1;
5910 5911

  DBUG_ASSERT(total_ha_2pc > 1);
5912
  DBUG_ASSERT(opt_name && opt_name[0]);
5913 5914 5915 5916

  pthread_mutex_init(&LOCK_prep_xids, MY_MUTEX_INIT_FAST);
  pthread_cond_init (&COND_prep_xids, 0);

5917 5918 5919 5920 5921 5922 5923
  if (!my_b_inited(&index_file))
  {
    /* There was a failure to open the index file, can't open the binlog */
    cleanup();
    return 1;
  }

5924
  if (using_heuristic_recover())
5925 5926
  {
    /* generate a new binlog to mask a corrupted one */
5927
    open(opt_name, LOG_BIN, 0, WRITE_CACHE, 0, max_binlog_size, 0, TRUE);
5928
    cleanup();
5929
    return 1;
5930
  }
5931

5932
  if ((error= find_log_pos(&log_info, NullS, 1)))
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5933
  {
5934 5935 5936 5937 5938
    if (error != LOG_INFO_EOF)
      sql_print_error("find_log_pos() failed (error: %d)", error);
    else
      error= 0;
    goto err;
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5939
  }
5940 5941 5942 5943 5944

  {
    const char *errmsg;
    IO_CACHE    log;
    File        file;
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    Log_event  *ev=0;
    Format_description_log_event fdle(BINLOG_VERSION);
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    char        log_name[FN_REFLEN];
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    if (! fdle.is_valid())
      goto err;

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    do
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    {
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      strmake(log_name, log_info.log_file_name, sizeof(log_name)-1);
    } while (!(error= find_next_log(&log_info, 1)));

    if (error !=  LOG_INFO_EOF)
    {
      sql_print_error("find_log_pos() failed (error: %d)", error);
      goto err;
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    }
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    if ((file= open_binlog(&log, log_name, &errmsg)) < 0)
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    {
      sql_print_error("%s", errmsg);
      goto err;
    }

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    if ((ev= Log_event::read_log_event(&log, 0, &fdle)) &&
        ev->get_type_code() == FORMAT_DESCRIPTION_EVENT &&
        ev->flags & LOG_EVENT_BINLOG_IN_USE_F)
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    {
      sql_print_information("Recovering after a crash using %s", opt_name);
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      error= recover(&log, (Format_description_log_event *)ev);
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    }
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    else
      error=0;
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    delete ev;
    end_io_cache(&log);
    my_close(file, MYF(MY_WME));

    if (error)
      goto err;
  }

err:
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  return error;
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}

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/** This is called on shutdown, after ha_panic. */
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void TC_LOG_BINLOG::close()
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{
  DBUG_ASSERT(prepared_xids==0);
  pthread_mutex_destroy(&LOCK_prep_xids);
  pthread_cond_destroy (&COND_prep_xids);
}

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/**
  @todo
  group commit
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  @retval
    0    error
  @retval
    1    success
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*/
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int TC_LOG_BINLOG::log_xid(THD *thd, my_xid xid)
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{
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  DBUG_ENTER("TC_LOG_BINLOG::log");
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  Xid_log_event xle(thd, xid);
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  binlog_trx_data *trx_data=
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    (binlog_trx_data*) thd_get_ha_data(thd, binlog_hton);
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  /*
    We always commit the entire transaction when writing an XID. Also
    note that the return value is inverted.
   */
  DBUG_RETURN(!binlog_end_trans(thd, trx_data, &xle, TRUE));
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}

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int TC_LOG_BINLOG::unlog(ulong cookie, my_xid xid)
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{
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  DBUG_ENTER("TC_LOG_BINLOG::unlog");
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  pthread_mutex_lock(&LOCK_prep_xids);
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  DBUG_ASSERT(prepared_xids > 0);
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  if (--prepared_xids == 0) {
    DBUG_PRINT("info", ("prepared_xids=%lu", prepared_xids));
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    pthread_cond_signal(&COND_prep_xids);
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  }
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  pthread_mutex_unlock(&LOCK_prep_xids);
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  DBUG_RETURN(rotate_and_purge(0));     // as ::write() did not rotate
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}

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int TC_LOG_BINLOG::recover(IO_CACHE *log, Format_description_log_event *fdle)
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{
  Log_event  *ev;
  HASH xids;
  MEM_ROOT mem_root;

  if (! fdle->is_valid() ||
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      hash_init(&xids, &my_charset_bin, TC_LOG_PAGE_SIZE/3, 0,
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                sizeof(my_xid), 0, 0, MYF(0)))
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    goto err1;

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  init_alloc_root(&mem_root, TC_LOG_PAGE_SIZE, TC_LOG_PAGE_SIZE);
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  fdle->flags&= ~LOG_EVENT_BINLOG_IN_USE_F; // abort on the first error

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  while ((ev= Log_event::read_log_event(log,0,fdle)) && ev->is_valid())
  {
    if (ev->get_type_code() == XID_EVENT)
    {
      Xid_log_event *xev=(Xid_log_event *)ev;
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      uchar *x= (uchar *) memdup_root(&mem_root, (uchar*) &xev->xid,
                                      sizeof(xev->xid));
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      if (!x || my_hash_insert(&xids, x))
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        goto err2;
    }
    delete ev;
  }

  if (ha_recover(&xids))
    goto err2;

  free_root(&mem_root, MYF(0));
  hash_free(&xids);
  return 0;

err2:
  free_root(&mem_root, MYF(0));
  hash_free(&xids);
err1:
  sql_print_error("Crash recovery failed. Either correct the problem "
                  "(if it's, for example, out of memory error) and restart, "
                  "or delete (or rename) binary log and start mysqld with "
                  "--tc-heuristic-recover={commit|rollback}");
  return 1;
}

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#ifdef INNODB_COMPATIBILITY_HOOKS
/**
  Get the file name of the MySQL binlog.
  @return the name of the binlog file
*/
extern "C"
const char* mysql_bin_log_file_name(void)
{
  return mysql_bin_log.get_log_fname();
}
/**
  Get the current position of the MySQL binlog.
  @return byte offset from the beginning of the binlog
*/
extern "C"
ulonglong mysql_bin_log_file_pos(void)
{
  return (ulonglong) mysql_bin_log.get_log_file()->pos_in_file;
}
#endif /* INNODB_COMPATIBILITY_HOOKS */


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struct st_mysql_storage_engine binlog_storage_engine=
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{ MYSQL_HANDLERTON_INTERFACE_VERSION };
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mysql_declare_plugin(binlog)
{
  MYSQL_STORAGE_ENGINE_PLUGIN,
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  &binlog_storage_engine,
  "binlog",
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  "MySQL AB",
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  "This is a pseudo storage engine to represent the binlog in a transaction",
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  PLUGIN_LICENSE_GPL,
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  binlog_init, /* Plugin Init */
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  NULL, /* Plugin Deinit */
  0x0100 /* 1.0 */,
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  NULL,                       /* status variables                */
  NULL,                       /* system variables                */
  NULL                        /* config options                  */
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}
mysql_declare_plugin_end;