mariadb/sql/ha_myisam.cc

/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */


#ifdef __GNUC__
#pragma implementation				// gcc: Class implementation
#endif

#include "mysql_priv.h"
#include <m_ctype.h>
#include <myisampack.h>
#include "ha_myisam.h"
#include <stdarg.h>
#ifndef MASTER
#include "../srclib/myisam/myisamdef.h"
#else
#include "../myisam/myisamdef.h"
#endif

ulong myisam_recover_options= HA_RECOVER_NONE;

/* bits in myisam_recover_options */
const char *myisam_recover_names[] =
{ "DEFAULT", "BACKUP", "FORCE", "QUICK", NullS};
TYPELIB myisam_recover_typelib= {array_elements(myisam_recover_names)-1,"",
				 myisam_recover_names};


/*****************************************************************************
** MyISAM tables
*****************************************************************************/

// collect errors printed by mi_check routines

static void mi_check_print_msg(MI_CHECK *param,	const char* msg_type,
			       const char *fmt, va_list args)
{
  THD* thd = (THD*)param->thd;
  String* packet = &thd->packet;
  uint length;
  char msgbuf[MI_MAX_MSG_BUF];
  char name[NAME_LEN*2+2];
  packet->length(0);

  msgbuf[0] = 0;		// healthy paranoia ?
  my_vsnprintf(msgbuf, sizeof(msgbuf), fmt, args);
  msgbuf[sizeof(msgbuf) - 1] = 0; // healthy paranoia

  DBUG_PRINT(msg_type,("message: %s",msgbuf));

  if (thd->net.vio == 0)
  {
    sql_print_error(msgbuf);
    return;
  }
  if (param->testflag & (T_CREATE_MISSING_KEYS | T_SAFE_REPAIR | T_AUTO_REPAIR))
  {
    my_message(ER_NOT_KEYFILE,msgbuf,MYF(MY_WME));
    return;
  }
  length=(uint) (strxmov(name, param->db_name,".",param->table_name,NullS) -
		 name);
  net_store_data(packet, name, length);
  net_store_data(packet, param->op_name);
  net_store_data(packet, msg_type);

  net_store_data(packet, msgbuf);
  if (my_net_write(&thd->net, (char*)thd->packet.ptr(), thd->packet.length()))
    sql_print_error("Failed on my_net_write, writing to stderr instead: %s\n",
		    msgbuf);
  return;
}

extern "C" {

void mi_check_print_error(MI_CHECK *param, const char *fmt,...)
{
  param->error_printed|=1;
  param->out_flag|= O_DATA_LOST;
  va_list args;
  va_start(args, fmt);
  mi_check_print_msg(param, "error", fmt, args);
  va_end(args);
}

void mi_check_print_info(MI_CHECK *param, const char *fmt,...)
{
  va_list args;
  va_start(args, fmt);
  mi_check_print_msg(param, "info", fmt, args);
  va_end(args);
}

void mi_check_print_warning(MI_CHECK *param, const char *fmt,...)
{
  param->warning_printed=1;
  param->out_flag|= O_DATA_LOST;
  va_list args;
  va_start(args, fmt);
  mi_check_print_msg(param, "warning", fmt, args);
  va_end(args);
}

}

const char **ha_myisam::bas_ext() const
{ static const char *ext[]= { ".MYI",".MYD", NullS }; return ext; }


const char *ha_myisam::index_type(uint key_number)
{
  return ((table->key_info[key_number].flags & HA_FULLTEXT) ?
	  "FULLTEXT" :
	  "BTREE");
}

int ha_myisam::net_read_dump(NET* net)
{
  int data_fd = file->dfile;
  int error = 0;

  my_seek(data_fd, 0L, MY_SEEK_SET, MYF(MY_WME));
  for (;;)
  {
    ulong packet_len = my_net_read(net);
    if (!packet_len)
      break ; // end of file
    if (packet_len == packet_error)
    {
      sql_print_error("ha_myisam::net_read_dump - read error ");
      error= -1;
      goto err;
    }
    if (my_write(data_fd, (byte*)net->read_pos, (uint) packet_len,
		 MYF(MY_WME|MY_FNABP)))
    {
      error = errno;
      goto err;
    }
  }

err:
  return error;
}


int ha_myisam::dump(THD* thd, int fd)
{
  MYISAM_SHARE* share = file->s;
  NET* net = &thd->net;
  uint blocksize = share->blocksize;
  my_off_t bytes_to_read = share->state.state.data_file_length;
  int data_fd = file->dfile;
  byte * buf = (byte*) my_malloc(blocksize, MYF(MY_WME));
  if (!buf)
    return ENOMEM;

  int error = 0;
  my_seek(data_fd, 0L, MY_SEEK_SET, MYF(MY_WME));
  for (; bytes_to_read > 0;)
  {
    uint bytes = my_read(data_fd, buf, blocksize, MYF(MY_WME));
    if (bytes == MY_FILE_ERROR)
    {
      error = errno;
      goto err;
    }

    if (fd >= 0)
    {
      if (my_write(fd, buf, bytes, MYF(MY_WME | MY_FNABP)))
      {
	error = errno ? errno : EPIPE;
	goto err;
      }
    }
    else
    {
      if (my_net_write(net, (char*) buf, bytes))
      {
	error = errno ? errno : EPIPE;
	goto err;
      }
    }
    bytes_to_read -= bytes;
  }

  if (fd < 0)
  {
    my_net_write(net, "", 0);
    net_flush(net);
  }

err:
  my_free((gptr) buf, MYF(0));
  return error;
}

	/* Name is here without an extension */

int ha_myisam::open(const char *name, int mode, uint test_if_locked)
{
  if (!(file=mi_open(name, mode, test_if_locked)))
    return (my_errno ? my_errno : -1);

  if (test_if_locked & (HA_OPEN_IGNORE_IF_LOCKED | HA_OPEN_TMP_TABLE))
    VOID(mi_extra(file, HA_EXTRA_NO_WAIT_LOCK, 0));
  info(HA_STATUS_NO_LOCK | HA_STATUS_VARIABLE | HA_STATUS_CONST);
  if (!(test_if_locked & HA_OPEN_WAIT_IF_LOCKED))
    VOID(mi_extra(file, HA_EXTRA_WAIT_LOCK, 0));
  if (!table->db_record_offset)
    int_table_flags|=HA_REC_NOT_IN_SEQ;
  return (0);
}

int ha_myisam::close(void)
{
  MI_INFO *tmp=file;
  file=0;
  return mi_close(tmp);
}

int ha_myisam::write_row(byte * buf)
{
  statistic_increment(ha_write_count,&LOCK_status);

  /* If we have a timestamp column, update it to the current time */

  if (table->time_stamp)
    update_timestamp(buf+table->time_stamp-1);

  /*
    If we have an auto_increment column and we are writing a changed row
    or a new row, then update the auto_increment value in the record.
  */
  if (table->next_number_field && buf == table->record[0])
    update_auto_increment();
  return mi_write(file,buf);
}

int ha_myisam::check(THD* thd, HA_CHECK_OPT* check_opt)
{
  if (!file) return HA_ADMIN_INTERNAL_ERROR;
  int error;
  MI_CHECK param;
  MYISAM_SHARE* share = file->s;
  const char *old_proc_info=thd->proc_info;

  thd->proc_info="Checking table";
  myisamchk_init(&param);
  param.thd = thd;
  param.op_name = (char*)"check";
  param.db_name    = table->table_cache_key;
  param.table_name = table->table_name;
  param.testflag = check_opt->flags | T_CHECK | T_SILENT;

  if (!(table->db_stat & HA_READ_ONLY))
    param.testflag|= T_STATISTICS;
  param.using_global_keycache = 1;

  if (!mi_is_crashed(file) &&
      (((param.testflag & T_CHECK_ONLY_CHANGED) &&
	!(share->state.changed & (STATE_CHANGED | STATE_CRASHED |
				  STATE_CRASHED_ON_REPAIR)) &&
	share->state.open_count == 0) ||
       ((param.testflag & T_FAST) && (share->state.open_count ==
				      (uint) (share->global_changed ? 1 : 0)))))
    return HA_ADMIN_ALREADY_DONE;

  error = chk_status(&param, file);		// Not fatal
  error = chk_size(&param, file);
  if (!error)
    error |= chk_del(&param, file, param.testflag);
  if (!error)
    error = chk_key(&param, file);
  if (!error)
  {
    if ((!(param.testflag & T_QUICK) &&
	 ((share->options &
	   (HA_OPTION_PACK_RECORD | HA_OPTION_COMPRESS_RECORD)) ||
	  (param.testflag & (T_EXTEND | T_MEDIUM)))) ||
	mi_is_crashed(file))
    {
      uint old_testflag=param.testflag;
      param.testflag|=T_MEDIUM;
      init_io_cache(&param.read_cache, file->dfile,
		    my_default_record_cache_size, READ_CACHE,
		    share->pack.header_length, 1, MYF(MY_WME));
      error |= chk_data_link(&param, file, param.testflag & T_EXTEND);
      end_io_cache(&(param.read_cache));
      param.testflag=old_testflag;
    }
  }
  if (!error)
  {
    if ((share->state.changed & (STATE_CHANGED |
				 STATE_CRASHED_ON_REPAIR |
				 STATE_CRASHED | STATE_NOT_ANALYZED)) ||
	(param.testflag & T_STATISTICS) ||
	mi_is_crashed(file))
    {
      file->update|=HA_STATE_CHANGED | HA_STATE_ROW_CHANGED;
      pthread_mutex_lock(&share->intern_lock);
      share->state.changed&= ~(STATE_CHANGED | STATE_CRASHED |
			       STATE_CRASHED_ON_REPAIR);
      if (!(table->db_stat & HA_READ_ONLY))
	error=update_state_info(&param,file,UPDATE_TIME | UPDATE_OPEN_COUNT |
				UPDATE_STAT);
      pthread_mutex_unlock(&share->intern_lock);
      info(HA_STATUS_NO_LOCK | HA_STATUS_TIME | HA_STATUS_VARIABLE |
	   HA_STATUS_CONST);
    }
  }
  else if (!mi_is_crashed(file))
  {
    mi_mark_crashed(file);
    file->update |= HA_STATE_CHANGED | HA_STATE_ROW_CHANGED;
  }

  thd->proc_info=old_proc_info;
  return error ? HA_ADMIN_CORRUPT : HA_ADMIN_OK;
}


/*
  analyze the key distribution in the table
  As the table may be only locked for read, we have to take into account that
  two threads may do an analyze at the same time!
*/

int ha_myisam::analyze(THD *thd, HA_CHECK_OPT* check_opt)
{
  int error=0;
  MI_CHECK param;
  MYISAM_SHARE* share = file->s;

  myisamchk_init(&param);
  param.thd = thd;
  param.op_name = (char*) "analyze";
  param.db_name    = table->table_cache_key;
  param.table_name = table->table_name;
  param.testflag=(T_FAST | T_CHECK | T_SILENT | T_STATISTICS |
		  T_DONT_CHECK_CHECKSUM);
  param.using_global_keycache = 1;

  if (!(share->state.changed & STATE_NOT_ANALYZED))
    return HA_ADMIN_ALREADY_DONE;

  error = chk_key(&param, file);
  if (!error)
  {
    pthread_mutex_lock(&share->intern_lock);
    error=update_state_info(&param,file,UPDATE_STAT);
    pthread_mutex_unlock(&share->intern_lock);
  }
  else if (!mi_is_crashed(file))
    mi_mark_crashed(file);
  return error ? HA_ADMIN_CORRUPT : HA_ADMIN_OK;
}


int ha_myisam::restore(THD* thd, HA_CHECK_OPT *check_opt)
{
  HA_CHECK_OPT tmp_check_opt;
  char* backup_dir = thd->lex.backup_dir;
  char src_path[FN_REFLEN], dst_path[FN_REFLEN];
  char* table_name = table->real_name;
  int error;
  const char* errmsg;
  DBUG_ENTER("restore");

  if (fn_format_relative_to_data_home(src_path, table_name, backup_dir,
				      MI_NAME_DEXT))
    DBUG_RETURN(HA_ADMIN_INVALID);

  if (my_copy(src_path, fn_format(dst_path, table->path, "",
				  MI_NAME_DEXT, 4), MYF(MY_WME)))
  {
    error = HA_ADMIN_FAILED;
    errmsg = "Failed in my_copy (Error %d)";
    goto err;
  }

  tmp_check_opt.init();
  tmp_check_opt.flags |= T_VERY_SILENT | T_CALC_CHECKSUM | T_QUICK;
  DBUG_RETURN(repair(thd, &tmp_check_opt));

 err:
  {
    MI_CHECK param;
    myisamchk_init(&param);
    param.thd = thd;
    param.op_name = (char*)"restore";
    param.db_name    = table->table_cache_key;
    param.table_name = table->table_name;
    param.testflag = 0;
    mi_check_print_error(&param, errmsg, my_errno);
    DBUG_RETURN(error);
  }
}


int ha_myisam::backup(THD* thd, HA_CHECK_OPT *check_opt)
{
  char* backup_dir = thd->lex.backup_dir;
  char src_path[FN_REFLEN], dst_path[FN_REFLEN];
  char* table_name = table->real_name;
  int error;
  const char *errmsg;
  DBUG_ENTER("ha_myisam::backup");

  if (fn_format_relative_to_data_home(dst_path, table_name, backup_dir,
				      reg_ext))
  {
    errmsg = "Failed in fn_format() for .frm file (errno: %d)";
    error = HA_ADMIN_INVALID;
    goto err;
  }

  if (my_copy(fn_format(src_path, table->path,"", reg_ext, MY_UNPACK_FILENAME),
	      dst_path,
	      MYF(MY_WME | MY_HOLD_ORIGINAL_MODES | MY_DONT_OVERWRITE_FILE)))
  {
    error = HA_ADMIN_FAILED;
    errmsg = "Failed copying .frm file (errno: %d)";
    goto err;
  }

  /* Change extension */
  if (!fn_format(dst_path, dst_path, "", MI_NAME_DEXT,
		 MY_REPLACE_EXT | MY_UNPACK_FILENAME | MY_SAFE_PATH))
  {
    errmsg = "Failed in fn_format() for .MYD file (errno: %d)";
    error = HA_ADMIN_INVALID;
    goto err;
  }

  if (my_copy(fn_format(src_path, table->path,"", MI_NAME_DEXT,
			MY_UNPACK_FILENAME),
	      dst_path,
	      MYF(MY_WME | MY_HOLD_ORIGINAL_MODES | MY_DONT_OVERWRITE_FILE)))
  {
    errmsg = "Failed copying .MYD file (errno: %d)";
    error= HA_ADMIN_FAILED;
    goto err;
  }
  DBUG_RETURN(HA_ADMIN_OK);

 err:
  {
    MI_CHECK param;
    myisamchk_init(&param);
    param.thd = thd;
    param.op_name = (char*)"backup";
    param.db_name    = table->table_cache_key;
    param.table_name = table->table_name;
    param.testflag = 0;
    mi_check_print_error(&param,errmsg, my_errno);
    DBUG_RETURN(error);
  }
}


int ha_myisam::repair(THD* thd, HA_CHECK_OPT *check_opt)
{
  int error;
  MI_CHECK param;
  ha_rows start_records;

  if (!file) return HA_ADMIN_INTERNAL_ERROR;

  myisamchk_init(&param);
  param.thd = thd;
  param.op_name = (char*) "repair";
  param.testflag = ((check_opt->flags & ~(T_EXTEND)) |
		    T_SILENT | T_FORCE_CREATE | T_CALC_CHECKSUM |
		    (check_opt->flags & T_EXTEND ? T_REP : T_REP_BY_SORT));
  param.sort_buffer_length=  check_opt->sort_buffer_size;
  start_records=file->state->records;
  while ((error=repair(thd,param,0)) && param.retry_repair)
  {
    param.retry_repair=0;
    if (test_all_bits(param.testflag,
		      (uint) (T_RETRY_WITHOUT_QUICK | T_QUICK)))
    {
      param.testflag&= ~T_RETRY_WITHOUT_QUICK;
      sql_print_error("Note: Retrying repair of: '%s' without quick",
		      table->path);
      continue;
    }
    param.testflag&= ~T_QUICK;
    if ((param.testflag & T_REP_BY_SORT))
    {
      param.testflag= (param.testflag & ~T_REP_BY_SORT) | T_REP;
      sql_print_error("Note: Retrying repair of: '%s' with keycache",
		      table->path);
      continue;
    }
    break;
  }
  if (!error && start_records != file->state->records &&
      !(check_opt->flags & T_VERY_SILENT))
  {
    char llbuff[22],llbuff2[22];
    sql_print_error("Note: Found %s of %s rows when repairing '%s'",
		    llstr(file->state->records, llbuff),
		    llstr(start_records, llbuff2),
		    table->path);
  }
  return error;
}

int ha_myisam::optimize(THD* thd, HA_CHECK_OPT *check_opt)
{
  if (!file) return HA_ADMIN_INTERNAL_ERROR;
  MI_CHECK param;

  myisamchk_init(&param);
  param.thd = thd;
  param.op_name = (char*) "optimize";
  param.testflag = (check_opt->flags | T_SILENT | T_FORCE_CREATE |
		    T_REP_BY_SORT | T_STATISTICS | T_SORT_INDEX);
  param.sort_buffer_length=  check_opt->sort_buffer_size;
  return repair(thd,param,1);
}


int ha_myisam::repair(THD *thd, MI_CHECK &param, bool optimize)
{
  int error=0;
  uint local_testflag=param.testflag;
  bool optimize_done= !optimize, statistics_done=0;
  const char *old_proc_info=thd->proc_info;
  char fixed_name[FN_REFLEN];
  MYISAM_SHARE* share = file->s;
  ha_rows rows= file->state->records;
  DBUG_ENTER("ha_myisam::repair");

  param.db_name    = table->table_cache_key;
  param.table_name = table->table_name;
  param.tmpfile_createflag = O_RDWR | O_TRUNC;
  param.using_global_keycache = 1;
  param.thd=thd;
  param.tmpdir=mysql_tmpdir;
  param.out_flag=0;
  strmov(fixed_name,file->filename);

  // Don't lock tables if we have used LOCK TABLE
  if (!thd->locked_tables && 
      mi_lock_database(file, table->tmp_table ? F_EXTRA_LCK : F_WRLCK))
  {
    mi_check_print_error(&param,ER(ER_CANT_LOCK),my_errno);
    DBUG_RETURN(HA_ADMIN_FAILED);
  }

  if (!optimize ||
      ((file->state->del || share->state.split != file->state->records) &&
       (!(param.testflag & T_QUICK) ||
	!(share->state.changed & STATE_NOT_OPTIMIZED_KEYS))))
  {
    ulonglong key_map= ((local_testflag & T_CREATE_MISSING_KEYS) ?
			((ulonglong) 1L << share->base.keys)-1 :
			share->state.key_map);
    uint testflag=param.testflag;
    if (mi_test_if_sort_rep(file,file->state->records,key_map,0) &&
	(local_testflag & T_REP_BY_SORT))
    {
      local_testflag|= T_STATISTICS;
      param.testflag|= T_STATISTICS;		// We get this for free
      statistics_done=1;
      if (current_thd->variables.myisam_repair_threads>1)
      {
        char buf[40];
        /* TODO: respect myisam_repair_threads variable */
        my_snprintf(buf, 40, "Repair with %d threads", my_count_bits(key_map));
        thd->proc_info=buf;
        error = mi_repair_parallel(&param, file, fixed_name,
            param.testflag & T_QUICK);
        thd->proc_info="Repair done"; // to reset proc_info, as
                                      // it was pointing to local buffer
      }
      else
      {
        thd->proc_info="Repair by sorting";
        error = mi_repair_by_sort(&param, file, fixed_name,
            param.testflag & T_QUICK);
      }
    }
    else
    {
      thd->proc_info="Repair with keycache";
      param.testflag &= ~T_REP_BY_SORT;
      error=  mi_repair(&param, file, fixed_name,
			param.testflag & T_QUICK);
    }
    param.testflag=testflag;
    optimize_done=1;
  }
  if (!error)
  {
    if ((local_testflag & T_SORT_INDEX) &&
	(share->state.changed & STATE_NOT_SORTED_PAGES))
    {
      optimize_done=1;
      thd->proc_info="Sorting index";
      error=mi_sort_index(&param,file,fixed_name);
    }
    if (!statistics_done && (local_testflag & T_STATISTICS))
    {
      if (share->state.changed & STATE_NOT_ANALYZED)
      {
	optimize_done=1;
	thd->proc_info="Analyzing";
	error = chk_key(&param, file);
      }
      else
	local_testflag&= ~T_STATISTICS;		// Don't update statistics
    }
  }
  thd->proc_info="Saving state";
  if (!error)
  {
    if ((share->state.changed & STATE_CHANGED) || mi_is_crashed(file))
    {
      share->state.changed&= ~(STATE_CHANGED | STATE_CRASHED |
			       STATE_CRASHED_ON_REPAIR);
      file->update|=HA_STATE_CHANGED | HA_STATE_ROW_CHANGED;
    }
    /*
      the following 'if', thought conceptually wrong,
      is a useful optimization nevertheless.
    */
    if (file->state != &file->s->state.state)
      file->s->state.state = *file->state;
    if (file->s->base.auto_key)
      update_auto_increment_key(&param, file, 1);
    if (optimize_done)
      error = update_state_info(&param, file,
				UPDATE_TIME | UPDATE_OPEN_COUNT |
				(local_testflag &
				 T_STATISTICS ? UPDATE_STAT : 0));
    info(HA_STATUS_NO_LOCK | HA_STATUS_TIME | HA_STATUS_VARIABLE |
	 HA_STATUS_CONST);
    if (rows != file->state->records && ! (param.testflag & T_VERY_SILENT))
    {
      char llbuff[22],llbuff2[22];
      mi_check_print_warning(&param,"Number of rows changed from %s to %s",
			     llstr(rows,llbuff),
			     llstr(file->state->records,llbuff2));
    }
  }
  else
  {
    mi_mark_crashed_on_repair(file);
    file->update |= HA_STATE_CHANGED | HA_STATE_ROW_CHANGED;
    update_state_info(&param, file, 0);
  }
  thd->proc_info=old_proc_info;
  if (!thd->locked_tables)
    mi_lock_database(file,F_UNLCK);
  DBUG_RETURN(error ? HA_ADMIN_FAILED :
	      !optimize_done ? HA_ADMIN_ALREADY_DONE : HA_ADMIN_OK);
}


/*
  Deactive all not unique index that can be recreated fast

  SYNOPSIS
    deactivate_non_unique_index()
    rows		Rows to be inserted
			0 if we don't know
			HA_POS_ERROR if we want to disable all keys
*/

void ha_myisam::deactivate_non_unique_index(ha_rows rows)
{
  MYISAM_SHARE* share = file->s;
  if (share->state.key_map == ((ulonglong) 1L << share->base.keys)-1)
  {
    if (!(specialflag & SPECIAL_SAFE_MODE))
    {
      if (rows == HA_POS_ERROR)
        mi_extra(file, HA_EXTRA_NO_KEYS, 0);
      else
      {
	/*
	  Only disable old index if the table was empty and we are inserting
	  a lot of rows.
	  We should not do this for only a few rows as this is slower and
	  we don't want to update the key statistics based of only a few rows.
	*/
	if (file->state->records == 0 &&
	    (!rows || rows >= MI_MIN_ROWS_TO_USE_BULK_INSERT))
	  mi_disable_non_unique_index(file,rows);
        else
        {
          mi_init_bulk_insert(file,
			      current_thd->variables.bulk_insert_buff_size,
			      rows);
	  table->bulk_insert= 1;
	}
      }
    }
    enable_activate_all_index=1;
    info(HA_STATUS_CONST);			// Read new key info
  }
  else
    enable_activate_all_index=0;
}


bool ha_myisam::activate_all_index(THD *thd)
{
  int error=0;
  MI_CHECK param;
  MYISAM_SHARE* share = file->s;
  DBUG_ENTER("activate_all_index");

  mi_end_bulk_insert(file);
  table->bulk_insert= 0;
  if (enable_activate_all_index &&
     share->state.key_map != set_bits(ulonglong, share->base.keys))
  {
    const char *save_proc_info=thd->proc_info;
    thd->proc_info="Creating index";
    myisamchk_init(&param);
    param.op_name = (char*) "recreating_index";
    param.testflag = (T_SILENT | T_REP_BY_SORT | T_QUICK |
		      T_CREATE_MISSING_KEYS);
    param.myf_rw&= ~MY_WAIT_IF_FULL;
    param.sort_buffer_length=  thd->variables.myisam_sort_buff_size;
    param.tmpdir=mysql_tmpdir;
    error=repair(thd,param,0) != HA_ADMIN_OK;
    info(HA_STATUS_CONST);
    thd->proc_info=save_proc_info;
  }
  else
    enable_activate_all_index=1;
  DBUG_RETURN(error);
}


bool ha_myisam::check_and_repair(THD *thd)
{
  int error=0;
  int marked_crashed;
  HA_CHECK_OPT check_opt;
  DBUG_ENTER("ha_myisam::auto_check_and_repair");

  check_opt.init();
  check_opt.flags= T_MEDIUM | T_AUTO_REPAIR;
  // Don't use quick if deleted rows
  if (!file->state->del && (myisam_recover_options & HA_RECOVER_QUICK))
    check_opt.flags|=T_QUICK;
  sql_print_error("Warning: Checking table:   '%s'",table->path);
  if ((marked_crashed=mi_is_crashed(file)) || check(thd, &check_opt))
  {
    sql_print_error("Warning: Recovering table: '%s'",table->path);
    check_opt.flags=
      ((myisam_recover_options & HA_RECOVER_BACKUP ? T_BACKUP_DATA : 0) |
       (marked_crashed                             ? 0 : T_QUICK) |
       (myisam_recover_options & HA_RECOVER_FORCE  ? 0 : T_SAFE_REPAIR) |
       T_AUTO_REPAIR);
    if (repair(thd, &check_opt))
      error=1;
  }
  DBUG_RETURN(error);
}

bool ha_myisam::is_crashed() const
{
  return (file->s->state.changed & STATE_CRASHED ||
	  (my_disable_locking && file->s->state.open_count));
}

int ha_myisam::update_row(const byte * old_data, byte * new_data)
{
  statistic_increment(ha_update_count,&LOCK_status);
  if (table->time_stamp)
    update_timestamp(new_data+table->time_stamp-1);
  return mi_update(file,old_data,new_data);
}

int ha_myisam::delete_row(const byte * buf)
{
  statistic_increment(ha_delete_count,&LOCK_status);
  return mi_delete(file,buf);
}

int ha_myisam::index_read(byte * buf, const byte * key,
			  uint key_len, enum ha_rkey_function find_flag)
{
  statistic_increment(ha_read_key_count,&LOCK_status);
  int error=mi_rkey(file,buf,active_index, key, key_len, find_flag);
  table->status=error ? STATUS_NOT_FOUND: 0;
  return error;
}

int ha_myisam::index_read_idx(byte * buf, uint index, const byte * key,
			      uint key_len, enum ha_rkey_function find_flag)
{
  statistic_increment(ha_read_key_count,&LOCK_status);
  int error=mi_rkey(file,buf,index, key, key_len, find_flag);
  table->status=error ? STATUS_NOT_FOUND: 0;
  return error;
}

int ha_myisam::index_read_last(byte * buf, const byte * key, uint key_len)
{
  statistic_increment(ha_read_key_count,&LOCK_status);
  int error=mi_rkey(file,buf,active_index, key, key_len, HA_READ_PREFIX_LAST);
  table->status=error ? STATUS_NOT_FOUND: 0;
  return error;
}

int ha_myisam::index_next(byte * buf)
{
  statistic_increment(ha_read_next_count,&LOCK_status);
  int error=mi_rnext(file,buf,active_index);
  table->status=error ? STATUS_NOT_FOUND: 0;
  return error;
}

int ha_myisam::index_prev(byte * buf)
{
  statistic_increment(ha_read_prev_count,&LOCK_status);
  int error=mi_rprev(file,buf, active_index);
  table->status=error ? STATUS_NOT_FOUND: 0;
  return error;
}

int ha_myisam::index_first(byte * buf)
{
  statistic_increment(ha_read_first_count,&LOCK_status);
  int error=mi_rfirst(file, buf, active_index);
  table->status=error ? STATUS_NOT_FOUND: 0;
  return error;
}

int ha_myisam::index_last(byte * buf)
{
  statistic_increment(ha_read_last_count,&LOCK_status);
  int error=mi_rlast(file, buf, active_index);
  table->status=error ? STATUS_NOT_FOUND: 0;
  return error;
}

int ha_myisam::index_next_same(byte * buf,
			       const byte *key __attribute__((unused)),
			       uint length __attribute__((unused)))
{
  statistic_increment(ha_read_next_count,&LOCK_status);
  int error=mi_rnext_same(file,buf);
  table->status=error ? STATUS_NOT_FOUND: 0;
  return error;
}


int ha_myisam::rnd_init(bool scan)
{
  if (scan)
    return mi_scan_init(file);
  return mi_extra(file, HA_EXTRA_RESET, 0);
}

int ha_myisam::rnd_next(byte *buf)
{
  statistic_increment(ha_read_rnd_next_count,&LOCK_status);
  int error=mi_scan(file, buf);
  table->status=error ? STATUS_NOT_FOUND: 0;
  return error;
}

int ha_myisam::restart_rnd_next(byte *buf, byte *pos)
{
  return rnd_pos(buf,pos);
}

int ha_myisam::rnd_pos(byte * buf, byte *pos)
{
  statistic_increment(ha_read_rnd_count,&LOCK_status);
  int error=mi_rrnd(file, buf, ha_get_ptr(pos,ref_length));
  table->status=error ? STATUS_NOT_FOUND: 0;
  return error;
}

void ha_myisam::position(const byte* record)
{
  my_off_t position=mi_position(file);
  ha_store_ptr(ref, ref_length, position);
}

void ha_myisam::info(uint flag)
{
  MI_ISAMINFO info;
  char name_buff[FN_REFLEN];

  (void) mi_status(file,&info,flag);
  if (flag & HA_STATUS_VARIABLE)
  {
    records = info.records;
    deleted = info.deleted;
    data_file_length=info.data_file_length;
    index_file_length=info.index_file_length;
    delete_length = info.delete_length;
    check_time  = info.check_time;
    mean_rec_length=info.mean_reclength;
  }
  if (flag & HA_STATUS_CONST)
  {
    max_data_file_length=info.max_data_file_length;
    max_index_file_length=info.max_index_file_length;
    create_time = info.create_time;
    sortkey = info.sortkey;
    ref_length=info.reflength;
    table->db_options_in_use    = info.options;
    block_size=myisam_block_size;
    table->keys_in_use= (set_bits(key_map, table->keys) &
			 (key_map) info.key_map);
    table->keys_for_keyread= table->keys_in_use & ~table->read_only_keys;
    table->db_record_offset=info.record_offset;
    if (table->key_parts)
      memcpy((char*) table->key_info[0].rec_per_key,
	     (char*) info.rec_per_key,
	     sizeof(table->key_info[0].rec_per_key)*table->key_parts);
    raid_type=info.raid_type;
    raid_chunks=info.raid_chunks;
    raid_chunksize=info.raid_chunksize;

   /*
     Set data_file_name and index_file_name to point at the symlink value
     if table is symlinked (Ie;  Real name is not same as generated name)
   */
    data_file_name=index_file_name=0;
    fn_format(name_buff, file->filename, "", MI_NAME_DEXT, 2);
    if (strcmp(name_buff, info.data_file_name))
      data_file_name=info.data_file_name;
    strmov(fn_ext(name_buff),MI_NAME_IEXT);
    if (strcmp(name_buff, info.index_file_name))
      index_file_name=info.index_file_name;
  }
  if (flag & HA_STATUS_ERRKEY)
  {
    errkey  = info.errkey;
    ha_store_ptr(dupp_ref, ref_length, info.dupp_key_pos);
  }
  if (flag & HA_STATUS_TIME)
    update_time = info.update_time;
  if (flag & HA_STATUS_AUTO)
    auto_increment_value= info.auto_increment;
}


int ha_myisam::extra(enum ha_extra_function operation)
{
  if ((specialflag & SPECIAL_SAFE_MODE) && operation == HA_EXTRA_KEYREAD)
    return 0;
  return mi_extra(file, operation, 0);
}


/* To be used with WRITE_CACHE and EXTRA_CACHE */

int ha_myisam::extra_opt(enum ha_extra_function operation, ulong cache_size)
{
  if ((specialflag & SPECIAL_SAFE_MODE) && operation == HA_EXTRA_WRITE_CACHE)
    return 0;
  return mi_extra(file, operation, (void*) &cache_size);
}


int ha_myisam::reset(void)
{
  return mi_extra(file, HA_EXTRA_RESET, 0);
}

int ha_myisam::delete_all_rows()
{
  return mi_delete_all_rows(file);
}

int ha_myisam::delete_table(const char *name)
{
  return mi_delete_table(name);
}

int ha_myisam::external_lock(THD *thd, int lock_type)
{
  return mi_lock_database(file, !table->tmp_table ?
			  lock_type : ((lock_type == F_UNLCK) ?
				       F_UNLCK : F_EXTRA_LCK));
}


THR_LOCK_DATA **ha_myisam::store_lock(THD *thd,
				      THR_LOCK_DATA **to,
				      enum thr_lock_type lock_type)
{
  if (lock_type != TL_IGNORE && file->lock.type == TL_UNLOCK)
    file->lock.type=lock_type;
  *to++= &file->lock;
  return to;
}

void ha_myisam::update_create_info(HA_CREATE_INFO *create_info)
{
  ha_myisam::info(HA_STATUS_AUTO | HA_STATUS_CONST);
  if (!(create_info->used_fields & HA_CREATE_USED_AUTO))
  {
    create_info->auto_increment_value=auto_increment_value;
  }
  if (!(create_info->used_fields & HA_CREATE_USED_RAID))
  {
    create_info->raid_type= raid_type;
    create_info->raid_chunks= raid_chunks;
    create_info->raid_chunksize= raid_chunksize;
  }
  create_info->data_file_name=data_file_name;
  create_info->index_file_name=index_file_name;
}


int ha_myisam::create(const char *name, register TABLE *table_arg,
		      HA_CREATE_INFO *info)
{
  int error;
  uint i,j,recpos,minpos,fieldpos,temp_length,length;
  bool found_real_auto_increment=0;
  enum ha_base_keytype type;
  char buff[FN_REFLEN];
  KEY *pos;
  MI_KEYDEF *keydef;
  MI_COLUMNDEF *recinfo,*recinfo_pos;
  MI_KEYSEG *keyseg;
  uint options=table_arg->db_options_in_use;
  DBUG_ENTER("ha_myisam::create");

  type=HA_KEYTYPE_BINARY;				// Keep compiler happy
  if (!(my_multi_malloc(MYF(MY_WME),
			&recinfo,(table_arg->fields*2+2)*sizeof(MI_COLUMNDEF),
			&keydef, table_arg->keys*sizeof(MI_KEYDEF),
			&keyseg,
			((table_arg->key_parts + table_arg->keys) *
			 sizeof(MI_KEYSEG)),
			NullS)))
    DBUG_RETURN(HA_ERR_OUT_OF_MEM);

  pos=table_arg->key_info;
  for (i=0; i < table_arg->keys ; i++, pos++)
  {
    keydef[i].flag= (pos->flags & (HA_NOSAME | HA_FULLTEXT));
    keydef[i].seg=keyseg;
    keydef[i].keysegs=pos->key_parts;
    for (j=0 ; j < pos->key_parts ; j++)
    {
      keydef[i].seg[j].flag=pos->key_part[j].key_part_flag;
      Field *field=pos->key_part[j].field;
      type=field->key_type();

      if (options & HA_OPTION_PACK_KEYS ||
	  (pos->flags & (HA_PACK_KEY | HA_BINARY_PACK_KEY |
			 HA_SPACE_PACK_USED)))
      {
	if (pos->key_part[j].length > 8 &&
	    (type == HA_KEYTYPE_TEXT ||
	     type == HA_KEYTYPE_NUM ||
	     (type == HA_KEYTYPE_BINARY && !field->zero_pack())))
	{
	  /* No blobs here */
	  if (j == 0)
	    keydef[i].flag|=HA_PACK_KEY;
	  if (!(field->flags & ZEROFILL_FLAG) &&
	      (field->type() == FIELD_TYPE_STRING ||
	       field->type() == FIELD_TYPE_VAR_STRING ||
	       ((int) (pos->key_part[j].length - field->decimals()))
	       >= 4))
	    keydef[i].seg[j].flag|=HA_SPACE_PACK;
	}
	else if (j == 0 && (!(pos->flags & HA_NOSAME) || pos->key_length > 16))
	  keydef[i].flag|= HA_BINARY_PACK_KEY;
      }
      keydef[i].seg[j].type=   (int) type;
      keydef[i].seg[j].start=  pos->key_part[j].offset;
      keydef[i].seg[j].length= pos->key_part[j].length;
      keydef[i].seg[j].bit_start=keydef[i].seg[j].bit_end=0;
      keydef[i].seg[j].language=MY_CHARSET_CURRENT;

      if (field->null_ptr)
      {
	keydef[i].seg[j].null_bit=field->null_bit;
	keydef[i].seg[j].null_pos= (uint) (field->null_ptr-
					   (uchar*) table_arg->record[0]);
      }
      else
      {
	keydef[i].seg[j].null_bit=0;
	keydef[i].seg[j].null_pos=0;
      }
      if (field->type() == FIELD_TYPE_BLOB)
      {
	keydef[i].seg[j].flag|=HA_BLOB_PART;
	/* save number of bytes used to pack length */
	keydef[i].seg[j].bit_start= (uint) (field->pack_length() -
					    table_arg->blob_ptr_size);
      }
    }
    keyseg+=pos->key_parts;
  }

  if (table_arg->found_next_number_field)
  {
    keydef[table_arg->next_number_index].flag|= HA_AUTO_KEY;
    found_real_auto_increment= table_arg->next_number_key_offset == 0;
  }

  recpos=0; recinfo_pos=recinfo;
  while (recpos < (uint) table_arg->reclength)
  {
    Field **field,*found=0;
    minpos=table_arg->reclength; length=0;

    for (field=table_arg->field ; *field ; field++)
    {
      if ((fieldpos=(*field)->offset()) >= recpos &&
	  fieldpos <= minpos)
      {
	/* skip null fields */
	if (!(temp_length= (*field)->pack_length()))
	  continue;				/* Skip null-fields */
	if (! found || fieldpos < minpos ||
	    (fieldpos == minpos && temp_length < length))
	{
	  minpos=fieldpos; found= *field; length=temp_length;
	}
      }
    }
    DBUG_PRINT("loop",("found: %lx  recpos: %d  minpos: %d  length: %d",
		       found,recpos,minpos,length));
    if (recpos != minpos)
    {						// Reserved space (Null bits?)
      bzero((char*) recinfo_pos,sizeof(*recinfo_pos));
      recinfo_pos->type=(int) FIELD_NORMAL;
      recinfo_pos++->length= (uint16) (minpos-recpos);
    }
    if (! found)
      break;

    if (found->flags & BLOB_FLAG)
    {
      recinfo_pos->type= (int) FIELD_BLOB;
    }
    else if (!(options & HA_OPTION_PACK_RECORD))
      recinfo_pos->type= (int) FIELD_NORMAL;
    else if (found->zero_pack())
      recinfo_pos->type= (int) FIELD_SKIP_ZERO;
    else
      recinfo_pos->type= (int) ((length <= 3 ||
				      (found->flags & ZEROFILL_FLAG)) ?
				     FIELD_NORMAL :
				     found->type() == FIELD_TYPE_STRING ||
				     found->type() == FIELD_TYPE_VAR_STRING ?
				     FIELD_SKIP_ENDSPACE :
				     FIELD_SKIP_PRESPACE);
    if (found->null_ptr)
    {
      recinfo_pos->null_bit=found->null_bit;
      recinfo_pos->null_pos= (uint) (found->null_ptr-
				  (uchar*) table_arg->record[0]);
    }
    else
    {
      recinfo_pos->null_bit=0;
      recinfo_pos->null_pos=0;
    }
    (recinfo_pos++) ->length=(uint16) length;
    recpos=minpos+length;
    DBUG_PRINT("loop",("length: %d  type: %d",
		       recinfo_pos[-1].length,recinfo_pos[-1].type));

  }
  MI_CREATE_INFO create_info;
  bzero((char*) &create_info,sizeof(create_info));
  create_info.max_rows=table_arg->max_rows;
  create_info.reloc_rows=table_arg->min_rows;
  create_info.with_auto_increment=found_real_auto_increment;
  create_info.auto_increment=(info->auto_increment_value ?
			      info->auto_increment_value -1 :
			      (ulonglong) 0);
  create_info.data_file_length= ((ulonglong) table_arg->max_rows *
				 table_arg->avg_row_length);
  create_info.raid_type=info->raid_type;
  create_info.raid_chunks= (info->raid_chunks ? info->raid_chunks :
			    RAID_DEFAULT_CHUNKS);
  create_info.raid_chunksize=(info->raid_chunksize ? info->raid_chunksize :
			      RAID_DEFAULT_CHUNKSIZE);
  create_info.data_file_name= info->data_file_name;
  create_info.index_file_name=info->index_file_name;

  error=mi_create(fn_format(buff,name,"","",2+4),
		  table_arg->keys,keydef,
		  (uint) (recinfo_pos-recinfo), recinfo,
		  0, (MI_UNIQUEDEF*) 0,
		  &create_info,
		  (((options & HA_OPTION_PACK_RECORD) ? HA_PACK_RECORD : 0) |
		   ((options & HA_OPTION_CHECKSUM) ? HA_CREATE_CHECKSUM : 0) |
		   ((options & HA_OPTION_DELAY_KEY_WRITE) ?
		    HA_CREATE_DELAY_KEY_WRITE : 0)));


  my_free((gptr) recinfo,MYF(0));
  DBUG_RETURN(error);
}


int ha_myisam::rename_table(const char * from, const char * to)
{
  return mi_rename(from,to);
}


longlong ha_myisam::get_auto_increment()
{
  if (!table->next_number_key_offset)
  {						// Autoincrement at key-start
    ha_myisam::info(HA_STATUS_AUTO);
    return auto_increment_value;
  }

  if (table->bulk_insert)
    mi_flush_bulk_insert(file, table->next_number_index);

  longlong nr;
  int error;
  byte key[MI_MAX_KEY_LENGTH];
  (void) extra(HA_EXTRA_KEYREAD);
  key_copy(key,table,table->next_number_index,
	   table->next_number_key_offset);
  error=mi_rkey(file,table->record[1],(int) table->next_number_index,
		key,table->next_number_key_offset,HA_READ_PREFIX_LAST);
  if (error)
    nr=1;
  else
    nr=(longlong)
      table->next_number_field->val_int_offset(table->rec_buff_length)+1;
  extra(HA_EXTRA_NO_KEYREAD);
  return nr;
}


/*
  Find out how many rows there is in the given range

  SYNOPSIS
    records_in_range()
    inx			Index to use
    start_key		Start of range.  Null pointer if from first key
    start_key_len	Length of start key
    start_search_flag	Flag if start key should be included or not
    end_key		End of range. Null pointer if to last key
    end_key_len		Length of end key
    end_search_flag	Flag if start key should be included or not

  NOTES
    start_search_flag can have one of the following values:
      HA_READ_KEY_EXACT		Include the key in the range
      HA_READ_AFTER_KEY		Don't include key in range

    end_search_flag can have one of the following values:  
      HA_READ_BEFORE_KEY	Don't include key in range
      HA_READ_AFTER_KEY		Include all 'end_key' values in the range

  RETURN
   HA_POS_ERROR		Something is wrong with the index tree.
   0			There is no matching keys in the given range
   number > 0		There is approximately 'number' matching rows in
			the range.
*/

ha_rows ha_myisam::records_in_range(int inx,
				    const byte *start_key,uint start_key_len,
				    enum ha_rkey_function start_search_flag,
				    const byte *end_key,uint end_key_len,
				    enum ha_rkey_function end_search_flag)
{
  return (ha_rows) mi_records_in_range(file,
				       inx,
				       start_key,start_key_len,
				       start_search_flag,
				       end_key,end_key_len,
				       end_search_flag);
}


int ha_myisam::ft_read(byte * buf)
{
  int error;

  if (!ft_handler)
    return -1;

  thread_safe_increment(ha_read_next_count,&LOCK_status); // why ?

  error=ft_handler->please->read_next(ft_handler,(char*) buf);

  table->status=error ? STATUS_NOT_FOUND: 0;
  return error;
}