mariadb/storage/maria/ha_maria.cc

/* Copyright (C) 2006,2004 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; version 2 of the License.

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

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


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

#define MYSQL_SERVER 1
#include "mysql_priv.h"
#include <mysql/plugin.h>
#include <m_ctype.h>
#include <myisampack.h>
#include <my_bit.h>
#include "ha_maria.h"
#include "trnman_public.h"

C_MODE_START
#include "maria_def.h"
#include "ma_rt_index.h"
#include "ma_blockrec.h"
#include "ma_checkpoint.h"
#include "ma_recovery.h"
C_MODE_END

/*
  Note that in future versions, only *transactional* Maria tables can
  rollback, so this flag should be up or down conditionally.
*/
#define MARIA_CANNOT_ROLLBACK HA_NO_TRANSACTIONS
#ifdef MARIA_CANNOT_ROLLBACK
#define trans_register_ha(A, B, C)  do { /* nothing */ } while(0)
#endif

/**
   @todo For now there is no way for a user to set a different value of
   maria_recover_options, i.e. auto-check-and-repair is always disabled.
   We could enable it. As the auto-repair is initiated when opened from the
   SQL layer (open_unireg_entry(), check_and_repair()), it does not happen
   when Maria's Recovery internally opens the table to apply log records to
   it, which is good. It would happen only after Recovery, if the table is
   still corrupted.
*/
ulong maria_recover_options= HA_RECOVER_NONE;
static handlerton *maria_hton;

/* bits in maria_recover_options */
const char *maria_recover_names[]=
{
  "DEFAULT", "BACKUP", "FORCE", "QUICK", NullS
};
TYPELIB maria_recover_typelib=
{
  array_elements(maria_recover_names) - 1, "",
  maria_recover_names, NULL
};

const char *maria_stats_method_names[]=
{
  "nulls_unequal", "nulls_equal",
  "nulls_ignored", NullS
};
TYPELIB maria_stats_method_typelib=
{
  array_elements(maria_stats_method_names) - 1, "",
  maria_stats_method_names, NULL
};

static void update_checkpoint_frequency(MYSQL_THD thd,
                                        struct st_mysql_sys_var *var,
                                        void *var_ptr, void *save);

static MYSQL_SYSVAR_ULONG(block_size, maria_block_size,
       PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
       "Block size to be used for MARIA index pages.", 0, 0,
       MARIA_KEY_BLOCK_LENGTH, MARIA_MIN_KEY_BLOCK_LENGTH,
       MARIA_MAX_KEY_BLOCK_LENGTH, MARIA_MIN_KEY_BLOCK_LENGTH);

static MYSQL_SYSVAR_ULONG(checkpoint_frequency, maria_checkpoint_frequency,
       PLUGIN_VAR_RQCMDARG,
       "Frequency of automatic checkpoints, in seconds;"
       " 0 means 'no checkpoints'.",
       NULL, update_checkpoint_frequency, 30, 0, UINT_MAX, 1);

static MYSQL_SYSVAR_ULONGLONG(max_sort_file_size,
       maria_max_temp_length, PLUGIN_VAR_RQCMDARG,
       "Don't use the fast sort index method to created index if the "
       "temporary file would get bigger than this.",
       0, 0, MAX_FILE_SIZE, 0, MAX_FILE_SIZE, 1024*1024);

static MYSQL_THDVAR_ULONG(repair_threads, PLUGIN_VAR_RQCMDARG,
       "Number of threads to use when repairing maria tables. The value of 1 "
       "disables parallel repair.",
       0, 0, 1, 1, ~0L, 1);

static MYSQL_THDVAR_ULONG(sort_buffer_size, PLUGIN_VAR_RQCMDARG,
       "The buffer that is allocated when sorting the index when doing a "
       "REPAIR or when creating indexes with CREATE INDEX or ALTER TABLE.",
       0, 0, 8192*1024, 4, ~0L, 1);

static MYSQL_THDVAR_ENUM(stats_method, PLUGIN_VAR_RQCMDARG,
       "Specifies how maria index statistics collection code should threat "
       "NULLs. Possible values of name are \"nulls_unequal\", \"nulls_equal\", "
       "and \"nulls_ignored\".", 0, 0, 0, &maria_stats_method_typelib);

/*****************************************************************************
** MARIA tables
*****************************************************************************/

static handler *maria_create_handler(handlerton *hton,
                                     TABLE_SHARE * table,
                                     MEM_ROOT *mem_root)
{
  return new (mem_root) ha_maria(hton, table);
}


// collect errors printed by maria_check routines

static void _ma_check_print_msg(HA_CHECK *param, const char *msg_type,
                                const char *fmt, va_list args)
{
  THD *thd= (THD *) param->thd;
  Protocol *protocol= thd->protocol;
  uint length, msg_length;
  char msgbuf[MARIA_MAX_MSG_BUF];
  char name[NAME_LEN * 2 + 2];

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

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

  if (!thd->vio_ok())
  {
    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);
  /*
    TODO: switch from protocol to push_warning here. The main reason we didn't
    it yet is parallel repair. Due to following trace:
    ma_check_print_msg/push_warning/sql_alloc/my_pthread_getspecific_ptr.

    Also we likely need to lock mutex here (in both cases with protocol and
    push_warning).
  */
  protocol->prepare_for_resend();
  protocol->store(name, length, system_charset_info);
  protocol->store(param->op_name, system_charset_info);
  protocol->store(msg_type, system_charset_info);
  protocol->store(msgbuf, msg_length, system_charset_info);
  if (protocol->write())
    sql_print_error("Failed on my_net_write, writing to stderr instead: %s\n",
                    msgbuf);
  return;
}


/*
  Convert TABLE object to Maria key and column definition

  SYNOPSIS
    table2maria()
      table_arg   in     TABLE object.
      keydef_out  out    Maria key definition.
      recinfo_out out    Maria column definition.
      records_out out    Number of fields.

  DESCRIPTION
    This function will allocate and initialize Maria key and column
    definition for further use in ma_create or for a check for underlying
    table conformance in merge engine.

  RETURN VALUE
    0  OK
    # error code
*/

int table2maria(TABLE *table_arg, MARIA_KEYDEF **keydef_out,
                MARIA_COLUMNDEF **recinfo_out, uint *records_out)
{
  uint i, j, recpos, minpos, fieldpos, temp_length, length;
  enum ha_base_keytype type= HA_KEYTYPE_BINARY;
  uchar *record;
  KEY *pos;
  MARIA_KEYDEF *keydef;
  MARIA_COLUMNDEF *recinfo, *recinfo_pos;
  HA_KEYSEG *keyseg;
  TABLE_SHARE *share= table_arg->s;
  uint options= share->db_options_in_use;
  DBUG_ENTER("table2maria");

  if (!(my_multi_malloc(MYF(MY_WME),
          recinfo_out, (share->fields * 2 + 2) * sizeof(MARIA_COLUMNDEF),
          keydef_out, share->keys * sizeof(MARIA_KEYDEF),
          &keyseg,
          (share->key_parts + share->keys) * sizeof(HA_KEYSEG),
          NullS)))
    DBUG_RETURN(HA_ERR_OUT_OF_MEM); /* purecov: inspected */
  keydef= *keydef_out;
  recinfo= *recinfo_out;
  pos= table_arg->key_info;
  for (i= 0; i < share->keys; i++, pos++)
  {
    keydef[i].flag= (pos->flags & (HA_NOSAME | HA_FULLTEXT | HA_SPATIAL));
    keydef[i].key_alg= pos->algorithm == HA_KEY_ALG_UNDEF ?
      (pos->flags & HA_SPATIAL ? HA_KEY_ALG_RTREE : HA_KEY_ALG_BTREE) :
      pos->algorithm;
    keydef[i].block_length= pos->block_size;
    keydef[i].seg= keyseg;
    keydef[i].keysegs= pos->key_parts;
    for (j= 0; j < pos->key_parts; j++)
    {
      Field *field= pos->key_part[j].field;
      type= field->key_type();
      keydef[i].seg[j].flag= pos->key_part[j].key_part_flag;

      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() == MYSQL_TYPE_STRING ||
               field->type() == MYSQL_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=
        keydef[i].seg[j].bit_length= 0;
      keydef[i].seg[j].bit_pos= 0;
      keydef[i].seg[j].language= field->charset()->number;

      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() == MYSQL_TYPE_BLOB ||
          field->type() == MYSQL_TYPE_GEOMETRY)
      {
        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() -
                                            share->blob_ptr_size);
      }
      else if (field->type() == MYSQL_TYPE_BIT)
      {
        keydef[i].seg[j].bit_length= ((Field_bit *) field)->bit_len;
        keydef[i].seg[j].bit_start= ((Field_bit *) field)->bit_ofs;
        keydef[i].seg[j].bit_pos= (uint) (((Field_bit *) field)->bit_ptr -
                                          (uchar*) table_arg->record[0]);
      }
    }
    keyseg+= pos->key_parts;
  }
  if (table_arg->found_next_number_field)
    keydef[share->next_number_index].flag|= HA_AUTO_KEY;
  record= table_arg->record[0];
  recpos= 0;
  recinfo_pos= recinfo;
  while (recpos < (uint) share->reclength)
  {
    Field **field, *found= 0;
    minpos= share->reclength;
    length= 0;

    for (field= table_arg->field; *field; field++)
    {
      if ((fieldpos= (*field)->offset(record)) >= recpos &&
          fieldpos <= minpos)
      {
        /* skip null fields */
        if (!(temp_length= (*field)->pack_length_in_rec()))
          continue; /* Skip null-fields */
        if (! found || fieldpos < minpos ||
            (fieldpos == minpos && temp_length < length))
        {
          minpos= fieldpos;
          found= *field;
          length= temp_length;
        }
      }
    }
    DBUG_PRINT("loop", ("found: 0x%lx  recpos: %d  minpos: %d  length: %d",
                        (long) found, recpos, minpos, length));
    if (recpos != minpos)
    {
      /* reserve space for null bits */
      bzero((char*) recinfo_pos, sizeof(*recinfo_pos));
      recinfo_pos->type= FIELD_NORMAL;
      recinfo_pos++->length= (uint16) (minpos - recpos);
    }
    if (!found)
      break;

    if (found->flags & BLOB_FLAG)
      recinfo_pos->type= FIELD_BLOB;
    else if (found->type() == MYSQL_TYPE_VARCHAR)
      recinfo_pos->type= FIELD_VARCHAR;
    else if (!(options & HA_OPTION_PACK_RECORD) ||
             (found->zero_pack() && (found->flags & PRI_KEY_FLAG)))
      recinfo_pos->type= FIELD_NORMAL;
    else if (found->zero_pack())
      recinfo_pos->type= FIELD_SKIP_ZERO;
    else
      recinfo_pos->type= ((length <= 3 ||
                           (found->flags & ZEROFILL_FLAG)) ?
                          FIELD_NORMAL :
                          found->type() == MYSQL_TYPE_STRING ||
                          found->type() == MYSQL_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));
  }
  *records_out= (uint) (recinfo_pos - recinfo);
  DBUG_RETURN(0);
}


/*
  Check for underlying table conformance

  SYNOPSIS
    maria_check_definition()
      t1_keyinfo       in    First table key definition
      t1_recinfo       in    First table record definition
      t1_keys          in    Number of keys in first table
      t1_recs          in    Number of records in first table
      t2_keyinfo       in    Second table key definition
      t2_recinfo       in    Second table record definition
      t2_keys          in    Number of keys in second table
      t2_recs          in    Number of records in second table
      strict           in    Strict check switch

  DESCRIPTION
    This function compares two Maria definitions. By intention it was done
    to compare merge table definition against underlying table definition.
    It may also be used to compare dot-frm and MAI definitions of Maria
    table as well to compare different Maria table definitions.

    For merge table it is not required that number of keys in merge table
    must exactly match number of keys in underlying table. When calling this
    function for underlying table conformance check, 'strict' flag must be
    set to false, and converted merge definition must be passed as t1_*.

    Otherwise 'strict' flag must be set to 1 and it is not required to pass
    converted dot-frm definition as t1_*.

  RETURN VALUE
    0 - Equal definitions.
    1 - Different definitions.

  TODO
    - compare FULLTEXT keys;
    - compare SPATIAL keys;
    - compare FIELD_SKIP_ZERO which is converted to FIELD_NORMAL correctly
      (should be corretly detected in table2maria).
*/
int maria_check_definition(MARIA_KEYDEF *t1_keyinfo,
                           MARIA_COLUMNDEF *t1_recinfo,
                           uint t1_keys, uint t1_recs,
                           MARIA_KEYDEF *t2_keyinfo,
                           MARIA_COLUMNDEF *t2_recinfo,
                           uint t2_keys, uint t2_recs, bool strict)
{
  uint i, j;
  DBUG_ENTER("maria_check_definition");
  if ((strict ? t1_keys != t2_keys : t1_keys > t2_keys))
  {
    DBUG_PRINT("error", ("Number of keys differs: t1_keys=%u, t2_keys=%u",
                         t1_keys, t2_keys));
    DBUG_RETURN(1);
  }
  if (t1_recs != t2_recs)
  {
    DBUG_PRINT("error", ("Number of recs differs: t1_recs=%u, t2_recs=%u",
                         t1_recs, t2_recs));
    DBUG_RETURN(1);
  }
  for (i= 0; i < t1_keys; i++)
  {
    HA_KEYSEG *t1_keysegs= t1_keyinfo[i].seg;
    HA_KEYSEG *t2_keysegs= t2_keyinfo[i].seg;
    if (t1_keyinfo[i].flag & HA_FULLTEXT && t2_keyinfo[i].flag & HA_FULLTEXT)
      continue;
    else if (t1_keyinfo[i].flag & HA_FULLTEXT ||
             t2_keyinfo[i].flag & HA_FULLTEXT)
    {
       DBUG_PRINT("error", ("Key %d has different definition", i));
       DBUG_PRINT("error", ("t1_fulltext= %d, t2_fulltext=%d",
                            test(t1_keyinfo[i].flag & HA_FULLTEXT),
                            test(t2_keyinfo[i].flag & HA_FULLTEXT)));
       DBUG_RETURN(1);
    }
    if (t1_keyinfo[i].flag & HA_SPATIAL && t2_keyinfo[i].flag & HA_SPATIAL)
      continue;
    else if (t1_keyinfo[i].flag & HA_SPATIAL ||
             t2_keyinfo[i].flag & HA_SPATIAL)
    {
       DBUG_PRINT("error", ("Key %d has different definition", i));
       DBUG_PRINT("error", ("t1_spatial= %d, t2_spatial=%d",
                            test(t1_keyinfo[i].flag & HA_SPATIAL),
                            test(t2_keyinfo[i].flag & HA_SPATIAL)));
       DBUG_RETURN(1);
    }
    if (t1_keyinfo[i].keysegs != t2_keyinfo[i].keysegs ||
        t1_keyinfo[i].key_alg != t2_keyinfo[i].key_alg)
    {
      DBUG_PRINT("error", ("Key %d has different definition", i));
      DBUG_PRINT("error", ("t1_keysegs=%d, t1_key_alg=%d",
                           t1_keyinfo[i].keysegs, t1_keyinfo[i].key_alg));
      DBUG_PRINT("error", ("t2_keysegs=%d, t2_key_alg=%d",
                           t2_keyinfo[i].keysegs, t2_keyinfo[i].key_alg));
      DBUG_RETURN(1);
    }
    for (j=  t1_keyinfo[i].keysegs; j--;)
    {
      if (t1_keysegs[j].type != t2_keysegs[j].type ||
          t1_keysegs[j].language != t2_keysegs[j].language ||
          t1_keysegs[j].null_bit != t2_keysegs[j].null_bit ||
          t1_keysegs[j].length != t2_keysegs[j].length)
      {
        DBUG_PRINT("error", ("Key segment %d (key %d) has different "
                             "definition", j, i));
        DBUG_PRINT("error", ("t1_type=%d, t1_language=%d, t1_null_bit=%d, "
                             "t1_length=%d",
                             t1_keysegs[j].type, t1_keysegs[j].language,
                             t1_keysegs[j].null_bit, t1_keysegs[j].length));
        DBUG_PRINT("error", ("t2_type=%d, t2_language=%d, t2_null_bit=%d, "
                             "t2_length=%d",
                             t2_keysegs[j].type, t2_keysegs[j].language,
                             t2_keysegs[j].null_bit, t2_keysegs[j].length));

        DBUG_RETURN(1);
      }
    }
  }
  for (i= 0; i < t1_recs; i++)
  {
    MARIA_COLUMNDEF *t1_rec= &t1_recinfo[i];
    MARIA_COLUMNDEF *t2_rec= &t2_recinfo[i];
    /*
      FIELD_SKIP_ZERO can be changed to FIELD_NORMAL in maria_create,
      see NOTE1 in ma_create.c
    */
    if ((t1_rec->type != t2_rec->type &&
         !(t1_rec->type == (int) FIELD_SKIP_ZERO &&
           t1_rec->length == 1 &&
           t2_rec->type == (int) FIELD_NORMAL)) ||
        t1_rec->length != t2_rec->length ||
        t1_rec->null_bit != t2_rec->null_bit)
    {
      DBUG_PRINT("error", ("Field %d has different definition", i));
      DBUG_PRINT("error", ("t1_type=%d, t1_length=%d, t1_null_bit=%d",
                           t1_rec->type, t1_rec->length, t1_rec->null_bit));
      DBUG_PRINT("error", ("t2_type=%d, t2_length=%d, t2_null_bit=%d",
                           t2_rec->type, t2_rec->length, t2_rec->null_bit));
      DBUG_RETURN(1);
    }
  }
  DBUG_RETURN(0);
}


extern "C" {

volatile int *_ma_killed_ptr(HA_CHECK *param)
{
  /* In theory Unsafe conversion, but should be ok for now */
  return (int*) &(((THD *) (param->thd))->killed);
}


void _ma_check_print_error(HA_CHECK *param, const char *fmt, ...)
{
  va_list args;
  DBUG_ENTER("_ma_check_print_error");
  param->error_printed |= 1;
  param->out_flag |= O_DATA_LOST;
  va_start(args, fmt);
  _ma_check_print_msg(param, "error", fmt, args);
  va_end(args);
  DBUG_VOID_RETURN;
}


void _ma_check_print_info(HA_CHECK *param, const char *fmt, ...)
{
  va_list args;
  DBUG_ENTER("_ma_check_print_info");
  va_start(args, fmt);
  _ma_check_print_msg(param, "info", fmt, args);
  va_end(args);
  DBUG_VOID_RETURN;
}


void _ma_check_print_warning(HA_CHECK *param, const char *fmt, ...)
{
  va_list args;
  DBUG_ENTER("_ma_check_print_warning");
  param->warning_printed= 1;
  param->out_flag |= O_DATA_LOST;
  va_start(args, fmt);
  _ma_check_print_msg(param, "warning", fmt, args);
  va_end(args);
  DBUG_VOID_RETURN;
}

}


ha_maria::ha_maria(handlerton *hton, TABLE_SHARE *table_arg):
handler(hton, table_arg), file(0),
int_table_flags(HA_NULL_IN_KEY | HA_CAN_FULLTEXT | HA_CAN_SQL_HANDLER |
                HA_BINLOG_ROW_CAPABLE | HA_BINLOG_STMT_CAPABLE |
                HA_DUPLICATE_POS | HA_CAN_INDEX_BLOBS | HA_AUTO_PART_KEY |
                HA_FILE_BASED | HA_CAN_GEOMETRY | MARIA_CANNOT_ROLLBACK |
                HA_CAN_BIT_FIELD | HA_CAN_RTREEKEYS |
                HA_HAS_RECORDS | HA_STATS_RECORDS_IS_EXACT),
can_enable_indexes(1)
{}


handler *ha_maria::clone(MEM_ROOT *mem_root)
{
  ha_maria *new_handler= static_cast <ha_maria *>(handler::clone(mem_root));
  if (new_handler)
    new_handler->file->state= file->state;
  return new_handler;
}


static const char *ha_maria_exts[]=
{
  MARIA_NAME_IEXT,
  MARIA_NAME_DEXT,
  NullS
};


const char **ha_maria::bas_ext() const
{
  return ha_maria_exts;
}


const char *ha_maria::index_type(uint key_number)
{
  return ((table->key_info[key_number].flags & HA_FULLTEXT) ?
          "FULLTEXT" :
          (table->key_info[key_number].flags & HA_SPATIAL) ?
          "SPATIAL" :
          (table->key_info[key_number].algorithm == HA_KEY_ALG_RTREE) ?
          "RTREE" : "BTREE");
}


double ha_maria::scan_time()
{
  if (file->s->data_file_type == BLOCK_RECORD)
    return ulonglong2double(stats.data_file_length - file->s->block_size) / max(file->s->block_size / 2, IO_SIZE) + 2;
  return handler::scan_time();
}

/*
  We need to be able to store at least two keys on an index page as the
  splitting algorithms depends on this. (With only one key on a page
  we also can't use any compression, which may make the index file much
  larger)
  We use HA_MAX_KEY_BUFF as this is a stack restriction imposed by the
  handler interface.

  We also need to reserve place for a record pointer (8) and 3 bytes
  per key segment to store the length of the segment + possible null bytes.
  These extra bytes are required here so that maria_create() will surely
  accept any keys created which the returned key data storage length.
*/

uint ha_maria::max_supported_key_length() const
{
  uint tmp= (maria_max_key_length() - 8 - HA_MAX_KEY_SEG*3);
  return min(HA_MAX_KEY_BUFF, tmp);
}


#ifdef HAVE_REPLICATION
int ha_maria::net_read_dump(NET * net)
{
  int data_fd= file->dfile.file;
  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_maria::net_read_dump - read error ");
      error= -1;
      goto err;
    }
    if (my_write(data_fd, (uchar *) net->read_pos, (uint) packet_len,
                 MYF(MY_WME | MY_FNABP)))
    {
      error= errno;
      goto err;
    }
  }
err:
  return error;
}


int ha_maria::dump(THD * thd, int fd)
{
  MARIA_SHARE *share= file->s;
  NET *net= &thd->net;
  uint block_size= share->block_size;
  my_off_t bytes_to_read= share->state.state.data_file_length;
  int data_fd= file->dfile.file;
  uchar *buf= (uchar *) my_malloc(block_size, 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;)
  {
    size_t bytes= my_read(data_fd, buf, block_size, 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, buf, bytes))
      {
        error= errno ? errno : EPIPE;
        goto err;
      }
    }
    bytes_to_read -= bytes;
  }

  if (fd < 0)
  {
    if (my_net_write(net, (uchar*) "", 0))
      error= errno ? errno : EPIPE;
    net_flush(net);
  }

err:
  my_free((uchar*) buf, MYF(0));
  return error;
}
#endif                                          /* HAVE_REPLICATION */

        /* Name is here without an extension */

int ha_maria::open(const char *name, int mode, uint test_if_locked)
{
  MARIA_KEYDEF *keyinfo;
  MARIA_COLUMNDEF *recinfo= 0;
  uint recs;
  uint i;

#ifdef NOT_USED
  /*
    If the user wants to have memory mapped data files, add an
    open_flag. Do not memory map temporary tables because they are
    expected to be inserted and thus extended a lot. Memory mapping is
    efficient for files that keep their size, but very inefficient for
    growing files. Using an open_flag instead of calling ma_extra(...
    HA_EXTRA_MMAP ...) after maxs_open() has the advantage that the
    mapping is not repeated for every open, but just done on the initial
    open, when the MyISAM share is created. Everytime the server
    requires to open a new instance of a table it calls this method. We
    will always supply HA_OPEN_MMAP for a permanent table. However, the
    Maria storage engine will ignore this flag if this is a secondary
    open of a table that is in use by other threads already (if the
    Maria share exists already).
  */
  if (!(test_if_locked & HA_OPEN_TMP_TABLE) && opt_maria_use_mmap)
    test_if_locked|= HA_OPEN_MMAP;
#endif

  if (!(file= maria_open(name, mode, test_if_locked | HA_OPEN_FROM_SQL_LAYER)))
    return (my_errno ? my_errno : -1);

  /**
     @todo ASK_MONTY
    This is a protection for the case of a frm and MAI containing incompatible
    table definitions (as in BUG#25908). This was merged from MyISAM.
    But it breaks maria.test and ps_maria.test ("incorrect key file") if the
    table is BLOCK_RECORD (does it have to do with column reordering done in
    ma_create.c ?).
  */
  if (!table->s->tmp_table) /* No need to perform a check for tmp table */
  {
    if ((my_errno= table2maria(table, &keyinfo, &recinfo, &recs)))
    {
      /* purecov: begin inspected */
      DBUG_PRINT("error", ("Failed to convert TABLE object to Maria "
                           "key and column definition"));
      goto err;
      /* purecov: end */
    }
#ifdef ASK_MONTY
    if (maria_check_definition(keyinfo, recinfo, table->s->keys, recs,
                               file->s->keyinfo, file->s->columndef,
                               file->s->base.keys, file->s->base.fields, true))
#else
    if (0)
#endif
    {
      /* purecov: begin inspected */
      my_errno= HA_ERR_CRASHED;
      goto err;
      /* purecov: end */
    }
  }

  if (test_if_locked & (HA_OPEN_IGNORE_IF_LOCKED | HA_OPEN_TMP_TABLE))
    VOID(maria_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(maria_extra(file, HA_EXTRA_WAIT_LOCK, 0));
  if ((data_file_type= file->s->data_file_type) != STATIC_RECORD)
    int_table_flags |= HA_REC_NOT_IN_SEQ;
  if (!file->s->base.born_transactional)
  {
    /*
      INSERT DELAYED cannot work with transactional tables (because it cannot
      stand up to "when client gets ok the data is safe on disk": the record
      may not even be inserted). In the future, we could enable it back (as a
      client doing INSERT DELAYED knows the specificities; but we then should
      make sure to regularly commit in the delayed_insert thread). 
    */
    int_table_flags|= HA_CAN_INSERT_DELAYED;
  }
  if (file->s->options & (HA_OPTION_CHECKSUM | HA_OPTION_COMPRESS_RECORD))
    int_table_flags |= HA_HAS_CHECKSUM;

  for (i= 0; i < table->s->keys; i++)
  {
    plugin_ref parser= table->key_info[i].parser;
    if (table->key_info[i].flags & HA_USES_PARSER)
      file->s->keyinfo[i].parser=
        (struct st_mysql_ftparser *)plugin_decl(parser)->info;
    table->key_info[i].block_size= file->s->keyinfo[i].block_length;
  }
  my_errno= 0;
  goto end;
 err:
  this->close();
 end:
  /*
    Both recinfo and keydef are allocated by my_multi_malloc(), thus only
    recinfo must be freed.
  */
  if (recinfo)
    my_free((uchar*) recinfo, MYF(0));
  return my_errno;
}


int ha_maria::close(void)
{
  MARIA_HA *tmp= file;
  file= 0;
  return maria_close(tmp);
}


int ha_maria::write_row(uchar * buf)
{
  ha_statistic_increment(&SSV::ha_write_count);

  /* If we have a timestamp column, update it to the current time */
  if (table->timestamp_field_type & TIMESTAMP_AUTO_SET_ON_INSERT)
    table->timestamp_field->set_time();

  /*
     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])
  {
    int error;
    if ((error= update_auto_increment()))
      return error;
  }
  return maria_write(file, buf);
}


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

  thd->proc_info= "Checking table";
  maria_chk_init(&param);
  param.thd= thd;
  param.op_name= "check";
  param.db_name= table->s->db.str;
  param.table_name= table->alias;
  param.testflag= check_opt->flags | T_CHECK | T_SILENT;
  param.stats_method= (enum_handler_stats_method)THDVAR(thd,stats_method);

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

  if (!maria_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= maria_chk_status(&param, file);                // Not fatal
  error= maria_chk_size(&param, file);
  if (!error)
    error |= maria_chk_del(&param, file, param.testflag);
  if (!error)
    error= maria_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)))) || maria_is_crashed(file))
    {
      uint old_testflag= param.testflag;
      param.testflag |= T_MEDIUM;
      if (!(error= init_io_cache(&param.read_cache, file->dfile.file,
                                 my_default_record_cache_size, READ_CACHE,
                                 share->pack.header_length, 1, MYF(MY_WME))))
      {
        error= maria_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) || maria_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= maria_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 (!maria_is_crashed(file) && !thd->killed)
  {
    maria_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_maria::analyze(THD *thd, HA_CHECK_OPT * check_opt)
{
  int error= 0;
  HA_CHECK param;
  MARIA_SHARE *share= file->s;

  maria_chk_init(&param);
  param.thd= thd;
  param.op_name= "analyze";
  param.db_name= table->s->db.str;
  param.table_name= table->alias;
  param.testflag= (T_FAST | T_CHECK | T_SILENT | T_STATISTICS |
                   T_DONT_CHECK_CHECKSUM);
  param.using_global_keycache= 1;
  param.stats_method= (enum_handler_stats_method)THDVAR(thd,stats_method);

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

  error= maria_chk_key(&param, file);
  if (!error)
  {
    pthread_mutex_lock(&share->intern_lock);
    error= maria_update_state_info(&param, file, UPDATE_STAT);
    pthread_mutex_unlock(&share->intern_lock);
  }
  else if (!maria_is_crashed(file) && !thd->killed)
    maria_mark_crashed(file);
  return error ? HA_ADMIN_CORRUPT : HA_ADMIN_OK;
}


int ha_maria::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[FN_REFLEN];
  int error;
  const char *errmsg;
  DBUG_ENTER("restore");

  VOID(tablename_to_filename(table->s->table_name.str, table_name,
                             sizeof(table_name)));

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

  strxmov(dst_path, table->s->normalized_path.str, MARIA_NAME_DEXT, NullS);
  if (my_copy(src_path, dst_path, 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:
  {
    HA_CHECK param;
    maria_chk_init(&param);
    param.thd= thd;
    param.op_name= "restore";
    param.db_name= table->s->db.str;
    param.table_name= table->s->table_name.str;
    param.testflag= 0;
    _ma_check_print_error(&param, errmsg, my_errno);
    DBUG_RETURN(error);
  }
}


int ha_maria::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[FN_REFLEN];
  int error;
  const char *errmsg;
  DBUG_ENTER("ha_maria::backup");

  VOID(tablename_to_filename(table->s->table_name.str, table_name,
                             sizeof(table_name)));

  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;
  }

  strxmov(src_path, table->s->normalized_path.str, reg_ext, NullS);
  if (my_copy(src_path, 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_relative_to_data_home(dst_path, table_name, backup_dir,
                                      MARIA_NAME_DEXT))
  {
    errmsg= "Failed in fn_format() for .MYD file (errno: %d)";
    error= HA_ADMIN_INVALID;
    goto err;
  }

  strxmov(src_path, table->s->normalized_path.str, MARIA_NAME_DEXT, NullS);
  if (_ma_flush_table_files(file, MARIA_FLUSH_DATA, FLUSH_FORCE_WRITE,
                            FLUSH_KEEP))
  {
    error= HA_ADMIN_FAILED;
    errmsg= "Failed in flush (Error %d)";
    goto err;
  }
  if (my_copy(src_path, 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:
  {
    HA_CHECK param;
    maria_chk_init(&param);
    param.thd= thd;
    param.op_name= "backup";
    param.db_name= table->s->db.str;
    param.table_name= table->s->table_name.str;
    param.testflag= 0;
    _ma_check_print_error(&param, errmsg, my_errno);
    DBUG_RETURN(error);
  }
}


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

  if (!file)
    return HA_ADMIN_INTERNAL_ERROR;

  maria_chk_init(&param);
  param.thd= thd;
  param.op_name= "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_information("Retrying repair of: '%s' without quick",
                            table->s->path.str);
      continue;
    }
    param.testflag &= ~T_QUICK;
    if ((param.testflag & T_REP_BY_SORT))
    {
      param.testflag= (param.testflag & ~T_REP_BY_SORT) | T_REP;
      sql_print_information("Retrying repair of: '%s' with keycache",
                            table->s->path.str);
      continue;
    }
    break;
  }
  if (!error && start_records != file->state->records &&
      !(check_opt->flags & T_VERY_SILENT))
  {
    char llbuff[22], llbuff2[22];
    sql_print_information("Found %s of %s rows when repairing '%s'",
                          llstr(file->state->records, llbuff),
                          llstr(start_records, llbuff2),
                          table->s->path.str);
  }
  return error;
}

int ha_maria::optimize(THD * thd, HA_CHECK_OPT *check_opt)
{
  int error;
  if (!file)
    return HA_ADMIN_INTERNAL_ERROR;
  HA_CHECK param;

  maria_chk_init(&param);
  param.thd= thd;
  param.op_name= "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;
  if ((error= repair(thd, param, 1)) && param.retry_repair)
  {
    sql_print_warning("Warning: Optimize table got errno %d on %s.%s, retrying",
                      my_errno, param.db_name, param.table_name);
    param.testflag &= ~T_REP_BY_SORT;
    error= repair(thd, param, 1);
  }
  return error;
}


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

  /*
    Normally this method is entered with a properly opened table. If the
    repair fails, it can be repeated with more elaborate options. Under
    special circumstances it can happen that a repair fails so that it
    closed the data file and cannot re-open it. In this case file->dfile
    is set to -1. We must not try another repair without an open data
    file. (Bug #25289)
  */
  if (file->dfile.file == -1)
  {
    sql_print_information("Retrying repair of: '%s' failed. "
                          "Please try REPAIR EXTENDED or maria_chk",
                          table->s->path.str);
    DBUG_RETURN(HA_ADMIN_FAILED);
  }

  param.db_name= table->s->db.str;
  param.table_name= table->alias;
  param.tmpfile_createflag= O_RDWR | O_TRUNC;
  param.using_global_keycache= 1;
  param.thd= thd;
  param.tmpdir= &mysql_tmpdir_list;
  param.out_flag= 0;
  strmov(fixed_name, file->s->open_file_name);

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

  if (!do_optimize ||
      ((file->state->del ||
        ((file->s->data_file_type != BLOCK_RECORD) &&
         share->state.split != file->state->records)) &&
       (!(param.testflag & T_QUICK) ||
        (share->state.changed & (STATE_NOT_OPTIMIZED_KEYS |
                                 STATE_NOT_OPTIMIZED_ROWS)))))
  {
    ulonglong key_map= ((local_testflag & T_CREATE_MISSING_KEYS) ?
                        maria_get_mask_all_keys_active(share->base.keys) :
                        share->state.key_map);
    uint testflag= param.testflag;
    if (maria_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;
      /* TODO: Remove BLOCK_RECORD test when parallel works with blocks */
      if (THDVAR(thd,repair_threads) > 1 &&
          file->s->data_file_type != BLOCK_RECORD)
      {
        char buf[40];
        /* TODO: respect maria_repair_threads variable */
        my_snprintf(buf, 40, "Repair with %d threads", my_count_bits(key_map));
        thd->proc_info= buf;
        error= maria_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= maria_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= maria_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= maria_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= maria_chk_key(&param, file);
      }
      else
        local_testflag &= ~T_STATISTICS;        // Don't update statistics
    }
  }
  thd->proc_info= "Saving state";
  pthread_mutex_lock(&share->intern_lock);
  if (!error)
  {
    if ((share->state.changed & STATE_CHANGED) || maria_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)
      _ma_update_auto_increment_key(&param, file, 1);
    if (optimize_done)
      error= maria_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];
      _ma_check_print_warning(&param, "Number of rows changed from %s to %s",
                              llstr(rows, llbuff),
                              llstr(file->state->records, llbuff2));
    }
  }
  else
  {
    maria_mark_crashed_on_repair(file);
    file->update |= HA_STATE_CHANGED | HA_STATE_ROW_CHANGED;
    maria_update_state_info(&param, file, 0);
  }
  pthread_mutex_unlock(&share->intern_lock);
  thd->proc_info= old_proc_info;
  if (!thd->locked_tables)
  {
    _ma_reenable_logging_for_table(file->s);
    maria_lock_database(file, F_UNLCK);
  }
  DBUG_RETURN(error ? HA_ADMIN_FAILED :
              !optimize_done ? HA_ADMIN_ALREADY_DONE : HA_ADMIN_OK);
}


/*
  Assign table indexes to a specific key cache.
*/

int ha_maria::assign_to_keycache(THD * thd, HA_CHECK_OPT *check_opt)
{
  PAGECACHE *new_pagecache= check_opt->pagecache;
  const char *errmsg= 0;
  int error= HA_ADMIN_OK;
  ulonglong map;
  TABLE_LIST *table_list= table->pos_in_table_list;
  DBUG_ENTER("ha_maria::assign_to_keycache");

  /* for now, it is disabled */
  DBUG_RETURN(HA_ADMIN_NOT_IMPLEMENTED);

  table->keys_in_use_for_query.clear_all();

  if (table_list->process_index_hints(table))
    DBUG_RETURN(HA_ADMIN_FAILED);
  map= ~(ulonglong) 0;
  if (!table->keys_in_use_for_query.is_clear_all())
    /* use all keys if there's no list specified by the user through hints */
    map= table->keys_in_use_for_query.to_ulonglong();

  if ((error= maria_assign_to_pagecache(file, map, new_pagecache)))
  {
    char buf[STRING_BUFFER_USUAL_SIZE];
    my_snprintf(buf, sizeof(buf),
                "Failed to flush to index file (errno: %d)", error);
    errmsg= buf;
    error= HA_ADMIN_CORRUPT;
  }

  if (error != HA_ADMIN_OK)
  {
    /* Send error to user */
    HA_CHECK param;
    maria_chk_init(&param);
    param.thd= thd;
    param.op_name= "assign_to_keycache";
    param.db_name= table->s->db.str;
    param.table_name= table->s->table_name.str;
    param.testflag= 0;
    _ma_check_print_error(&param, errmsg);
  }
  DBUG_RETURN(error);
}


/*
  Preload pages of the index file for a table into the key cache.
*/

int ha_maria::preload_keys(THD * thd, HA_CHECK_OPT *check_opt)
{
  int error;
  const char *errmsg;
  ulonglong map;
  TABLE_LIST *table_list= table->pos_in_table_list;
  my_bool ignore_leaves= table_list->ignore_leaves;
  char buf[ERRMSGSIZE+20];

  DBUG_ENTER("ha_maria::preload_keys");

  table->keys_in_use_for_query.clear_all();

  if (table_list->process_index_hints(table))
    DBUG_RETURN(HA_ADMIN_FAILED);

  map= ~(ulonglong) 0;
  /* Check validity of the index references */
  if (!table->keys_in_use_for_query.is_clear_all())
    /* use all keys if there's no list specified by the user through hints */
    map= table->keys_in_use_for_query.to_ulonglong();

  maria_extra(file, HA_EXTRA_PRELOAD_BUFFER_SIZE,
              (void*) &thd->variables.preload_buff_size);

  if ((error= maria_preload(file, map, ignore_leaves)))
  {
    switch (error) {
    case HA_ERR_NON_UNIQUE_BLOCK_SIZE:
      errmsg= "Indexes use different block sizes";
      break;
    case HA_ERR_OUT_OF_MEM:
      errmsg= "Failed to allocate buffer";
      break;
    default:
      my_snprintf(buf, ERRMSGSIZE,
                  "Failed to read from index file (errno: %d)", my_errno);
      errmsg= buf;
    }
    error= HA_ADMIN_FAILED;
    goto err;
  }

  DBUG_RETURN(HA_ADMIN_OK);

err:
  {
    HA_CHECK param;
    maria_chk_init(&param);
    param.thd= thd;
    param.op_name= "preload_keys";
    param.db_name= table->s->db.str;
    param.table_name= table->s->table_name.str;
    param.testflag= 0;
    _ma_check_print_error(&param, errmsg);
    DBUG_RETURN(error);
  }
}


/*
  Disable indexes, making it persistent if requested.

  SYNOPSIS
    disable_indexes()
    mode        mode of operation:
                HA_KEY_SWITCH_NONUNIQ      disable all non-unique keys
                HA_KEY_SWITCH_ALL          disable all keys
                HA_KEY_SWITCH_NONUNIQ_SAVE dis. non-uni. and make persistent
                HA_KEY_SWITCH_ALL_SAVE     dis. all keys and make persistent

  IMPLEMENTATION
    HA_KEY_SWITCH_NONUNIQ       is not implemented.
    HA_KEY_SWITCH_ALL_SAVE      is not implemented.

  RETURN
    0  ok
    HA_ERR_WRONG_COMMAND  mode not implemented.
*/

int ha_maria::disable_indexes(uint mode)
{
  int error;

  if (mode == HA_KEY_SWITCH_ALL)
  {
    /* call a storage engine function to switch the key map */
    error= maria_disable_indexes(file);
  }
  else if (mode == HA_KEY_SWITCH_NONUNIQ_SAVE)
  {
    maria_extra(file, HA_EXTRA_NO_KEYS, 0);
    info(HA_STATUS_CONST);                      // Read new key info
    error= 0;
  }
  else
  {
    /* mode not implemented */
    error= HA_ERR_WRONG_COMMAND;
  }
  return error;
}


/*
  Enable indexes, making it persistent if requested.

  SYNOPSIS
    enable_indexes()
    mode        mode of operation:
                HA_KEY_SWITCH_NONUNIQ      enable all non-unique keys
                HA_KEY_SWITCH_ALL          enable all keys
                HA_KEY_SWITCH_NONUNIQ_SAVE en. non-uni. and make persistent
                HA_KEY_SWITCH_ALL_SAVE     en. all keys and make persistent

  DESCRIPTION
    Enable indexes, which might have been disabled by disable_index() before.
    The modes without _SAVE work only if both data and indexes are empty,
    since the MARIA repair would enable them persistently.
    To be sure in these cases, call handler::delete_all_rows() before.

  IMPLEMENTATION
    HA_KEY_SWITCH_NONUNIQ       is not implemented.
    HA_KEY_SWITCH_ALL_SAVE      is not implemented.

  RETURN
    0  ok
    !=0  Error, among others:
    HA_ERR_CRASHED  data or index is non-empty. Delete all rows and retry.
    HA_ERR_WRONG_COMMAND  mode not implemented.
*/

int ha_maria::enable_indexes(uint mode)
{
  int error;

  if (maria_is_all_keys_active(file->s->state.key_map, file->s->base.keys))
  {
    /* All indexes are enabled already. */
    return 0;
  }

  if (mode == HA_KEY_SWITCH_ALL)
  {
    error= maria_enable_indexes(file);
    /*
       Do not try to repair on error,
       as this could make the enabled state persistent,
       but mode==HA_KEY_SWITCH_ALL forbids it.
    */
  }
  else if (mode == HA_KEY_SWITCH_NONUNIQ_SAVE)
  {
    THD *thd= current_thd;
    HA_CHECK param;
    const char *save_proc_info= thd->proc_info;
    thd->proc_info= "Creating index";
    maria_chk_init(&param);
    param.op_name= "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= THDVAR(thd,sort_buffer_size);
    param.stats_method= (enum_handler_stats_method)THDVAR(thd,stats_method);
    param.tmpdir= &mysql_tmpdir_list;
    if ((error= (repair(thd, param, 0) != HA_ADMIN_OK)) && param.retry_repair)
    {
      sql_print_warning("Warning: Enabling keys got errno %d on %s.%s, retrying",
                        my_errno, param.db_name, param.table_name);
      /* Repairing by sort failed. Now try standard repair method. */
      param.testflag &= ~(T_REP_BY_SORT | T_QUICK);
      error= (repair(thd, param, 0) != HA_ADMIN_OK);
      /*
         If the standard repair succeeded, clear all error messages which
         might have been set by the first repair. They can still be seen
         with SHOW WARNINGS then.
      */
#ifndef EMBEDDED_LIBRARY
      if (!error)
        thd->clear_error();
#endif /* EMBEDDED_LIBRARY */
    }
    info(HA_STATUS_CONST);
    thd->proc_info= save_proc_info;
  }
  else
  {
    /* mode not implemented */
    error= HA_ERR_WRONG_COMMAND;
  }
  return error;
}


/*
  Test if indexes are disabled.


  SYNOPSIS
    indexes_are_disabled()
      no parameters


  RETURN
    0  indexes are not disabled
    1  all indexes are disabled
   [2  non-unique indexes are disabled - NOT YET IMPLEMENTED]
*/

int ha_maria::indexes_are_disabled(void)
{
  return maria_indexes_are_disabled(file);
}


/*
  prepare for a many-rows insert operation
  e.g. - disable indexes (if they can be recreated fast) or
  activate special bulk-insert optimizations

  SYNOPSIS
    start_bulk_insert(rows)
    rows        Rows to be inserted
                0 if we don't know

  NOTICE
    Do not forget to call end_bulk_insert() later!
*/

void ha_maria::start_bulk_insert(ha_rows rows)
{
  DBUG_ENTER("ha_maria::start_bulk_insert");
  THD *thd= current_thd;
  ulong size= min(thd->variables.read_buff_size,
                  (ulong) (table->s->avg_row_length * rows));
  DBUG_PRINT("info", ("start_bulk_insert: rows %lu size %lu",
                      (ulong) rows, size));

  /* don't enable row cache if too few rows */
  if (!rows || (rows > MARIA_MIN_ROWS_TO_USE_WRITE_CACHE))
    maria_extra(file, HA_EXTRA_WRITE_CACHE, (void*) &size);

  can_enable_indexes= (maria_is_all_keys_active(file->s->state.key_map,
                                                file->s->base.keys));

  if (!(specialflag & SPECIAL_SAFE_MODE))
  {
    /*
       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 && can_enable_indexes &&
        (!rows || rows >= MARIA_MIN_ROWS_TO_DISABLE_INDEXES))
      maria_disable_non_unique_index(file, rows);
    else if (!file->bulk_insert &&
             (!rows || rows >= MARIA_MIN_ROWS_TO_USE_BULK_INSERT))
    {
      maria_init_bulk_insert(file, thd->variables.bulk_insert_buff_size, rows);
    }
  }
  DBUG_VOID_RETURN;
}


/*
  end special bulk-insert optimizations,
  which have been activated by start_bulk_insert().

  SYNOPSIS
    end_bulk_insert()
    no arguments

  RETURN
    0     OK
    != 0  Error
*/

int ha_maria::end_bulk_insert()
{
  int err;
  DBUG_ENTER("ha_maria::end_bulk_insert");
  maria_end_bulk_insert(file);
  err= maria_extra(file, HA_EXTRA_NO_CACHE, 0);
  DBUG_RETURN(err ? err : can_enable_indexes ?
              enable_indexes(HA_KEY_SWITCH_NONUNIQ_SAVE) : 0);
}


bool ha_maria::check_and_repair(THD *thd)
{
  int error= 0;
  int marked_crashed;
  char *old_query;
  uint old_query_length;
  HA_CHECK_OPT check_opt;
  DBUG_ENTER("ha_maria::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 && (maria_recover_options & HA_RECOVER_QUICK))
    check_opt.flags |= T_QUICK;
  sql_print_warning("Checking table:   '%s'", table->s->path.str);

  old_query= thd->query;
  old_query_length= thd->query_length;
  pthread_mutex_lock(&LOCK_thread_count);
  thd->query= table->s->table_name.str;
  thd->query_length= table->s->table_name.length;
  pthread_mutex_unlock(&LOCK_thread_count);

  if ((marked_crashed= maria_is_crashed(file)) || check(thd, &check_opt))
  {
    sql_print_warning("Recovering table: '%s'", table->s->path.str);
    check_opt.flags=
      ((maria_recover_options & HA_RECOVER_BACKUP ? T_BACKUP_DATA : 0) |
       (marked_crashed ? 0 : T_QUICK) |
       (maria_recover_options & HA_RECOVER_FORCE ? 0 : T_SAFE_REPAIR) |
       T_AUTO_REPAIR);
    if (repair(thd, &check_opt))
      error= 1;
  }
  pthread_mutex_lock(&LOCK_thread_count);
  thd->query= old_query;
  thd->query_length= old_query_length;
  pthread_mutex_unlock(&LOCK_thread_count);
  DBUG_RETURN(error);
}


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


int ha_maria::update_row(const uchar * old_data, uchar * new_data)
{
  ha_statistic_increment(&SSV::ha_update_count);
  if (table->timestamp_field_type & TIMESTAMP_AUTO_SET_ON_UPDATE)
    table->timestamp_field->set_time();
  return maria_update(file, old_data, new_data);
}


int ha_maria::delete_row(const uchar * buf)
{
  ha_statistic_increment(&SSV::ha_delete_count);
  return maria_delete(file, buf);
}


int ha_maria::index_read_map(uchar * buf, const uchar * key,
			     key_part_map keypart_map,
			     enum ha_rkey_function find_flag)
{
  DBUG_ASSERT(inited == INDEX);
  ha_statistic_increment(&SSV::ha_read_key_count);
  int error= maria_rkey(file, buf, active_index, key, keypart_map, find_flag);
  table->status= error ? STATUS_NOT_FOUND : 0;
  return error;
}


int ha_maria::index_read_idx_map(uchar * buf, uint index, const uchar * key,
				 key_part_map keypart_map,
				 enum ha_rkey_function find_flag)
{
  ha_statistic_increment(&SSV::ha_read_key_count);
  int error= maria_rkey(file, buf, index, key, keypart_map, find_flag);
  table->status= error ? STATUS_NOT_FOUND : 0;
  return error;
}


int ha_maria::index_read_last_map(uchar * buf, const uchar * key,
				  key_part_map keypart_map)
{
  DBUG_ENTER("ha_maria::index_read_last_map");
  DBUG_ASSERT(inited == INDEX);
  ha_statistic_increment(&SSV::ha_read_key_count);
  int error= maria_rkey(file, buf, active_index, key, keypart_map,
                        HA_READ_PREFIX_LAST);
  table->status= error ? STATUS_NOT_FOUND : 0;
  DBUG_RETURN(error);
}


int ha_maria::index_next(uchar * buf)
{
  DBUG_ASSERT(inited == INDEX);
  ha_statistic_increment(&SSV::ha_read_next_count);
  int error= maria_rnext(file, buf, active_index);
  table->status= error ? STATUS_NOT_FOUND : 0;
  return error;
}


int ha_maria::index_prev(uchar * buf)
{
  DBUG_ASSERT(inited == INDEX);
  ha_statistic_increment(&SSV::ha_read_prev_count);
  int error= maria_rprev(file, buf, active_index);
  table->status= error ? STATUS_NOT_FOUND : 0;
  return error;
}


int ha_maria::index_first(uchar * buf)
{
  DBUG_ASSERT(inited == INDEX);
  ha_statistic_increment(&SSV::ha_read_first_count);
  int error= maria_rfirst(file, buf, active_index);
  table->status= error ? STATUS_NOT_FOUND : 0;
  return error;
}


int ha_maria::index_last(uchar * buf)
{
  DBUG_ASSERT(inited == INDEX);
  ha_statistic_increment(&SSV::ha_read_last_count);
  int error= maria_rlast(file, buf, active_index);
  table->status= error ? STATUS_NOT_FOUND : 0;
  return error;
}


int ha_maria::index_next_same(uchar * buf,
                              const uchar *key __attribute__ ((unused)),
                              uint length __attribute__ ((unused)))
{
  DBUG_ASSERT(inited == INDEX);
  ha_statistic_increment(&SSV::ha_read_next_count);
  int error= maria_rnext_same(file, buf);
  table->status= error ? STATUS_NOT_FOUND : 0;
  return error;
}


int ha_maria::rnd_init(bool scan)
{
  if (scan)
    return maria_scan_init(file);
  return maria_reset(file);                        // Free buffers
}


int ha_maria::rnd_end()
{
  /* Safe to call even if we don't have started a scan */
  maria_scan_end(file);
  return 0;
}


int ha_maria::rnd_next(uchar *buf)
{
  ha_statistic_increment(&SSV::ha_read_rnd_next_count);
  int error= maria_scan(file, buf);
  table->status= error ? STATUS_NOT_FOUND : 0;
  return error;
}


int ha_maria::restart_rnd_next(uchar *buf, uchar *pos)
{
  return rnd_pos(buf, pos);
}


int ha_maria::rnd_pos(uchar * buf, uchar *pos)
{
  ha_statistic_increment(&SSV::ha_read_rnd_count);
  int error= maria_rrnd(file, buf, my_get_ptr(pos, ref_length));
  table->status= error ? STATUS_NOT_FOUND : 0;
  return error;
}


void ha_maria::position(const uchar * record)
{
  my_off_t row_position= maria_position(file);
  my_store_ptr(ref, ref_length, row_position);
}


int ha_maria::info(uint flag)
{
  MARIA_INFO maria_info;
  char name_buff[FN_REFLEN];

  (void) maria_status(file, &maria_info, flag);
  if (flag & HA_STATUS_VARIABLE)
  {
    stats.records=           maria_info.records;
    stats.deleted=           maria_info.deleted;
    stats.data_file_length=  maria_info.data_file_length;
    stats.index_file_length= maria_info.index_file_length;
    stats.delete_length=     maria_info.delete_length;
    stats.check_time=        maria_info.check_time;
    stats.mean_rec_length=   maria_info.mean_reclength;
  }
  if (flag & HA_STATUS_CONST)
  {
    TABLE_SHARE *share= table->s;
    stats.max_data_file_length=  maria_info.max_data_file_length;
    stats.max_index_file_length= maria_info.max_index_file_length;
    stats.create_time= maria_info.create_time;
    ref_length= maria_info.reflength;
    share->db_options_in_use= maria_info.options;
    stats.block_size= maria_block_size;

    /* Update share */
    if (share->tmp_table == NO_TMP_TABLE)
      pthread_mutex_lock(&share->mutex);
    share->keys_in_use.set_prefix(share->keys);
    share->keys_in_use.intersect_extended(maria_info.key_map);
    share->keys_for_keyread.intersect(share->keys_in_use);
    share->db_record_offset= maria_info.record_offset;
    if (share->key_parts)
      memcpy((char*) table->key_info[0].rec_per_key,
             (char*) maria_info.rec_per_key,
             sizeof(table->key_info[0].rec_per_key) * share->key_parts);
    if (share->tmp_table == NO_TMP_TABLE)
      pthread_mutex_unlock(&share->mutex);

    /*
       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->s->open_file_name, "", MARIA_NAME_DEXT,
              MY_APPEND_EXT | MY_UNPACK_FILENAME);
    if (strcmp(name_buff, maria_info.data_file_name))
      data_file_name=maria_info.data_file_name;
    fn_format(name_buff, file->s->open_file_name, "", MARIA_NAME_IEXT,
              MY_APPEND_EXT | MY_UNPACK_FILENAME);
    if (strcmp(name_buff, maria_info.index_file_name))
      index_file_name=maria_info.index_file_name;
  }
  if (flag & HA_STATUS_ERRKEY)
  {
    errkey= maria_info.errkey;
    my_store_ptr(dup_ref, ref_length, maria_info.dup_key_pos);
  }
  /* Faster to always update, than to do it based on flag */
  stats.update_time= maria_info.update_time;
  stats.auto_increment_value= maria_info.auto_increment;

  return 0;
}


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

int ha_maria::reset(void)
{
  return maria_reset(file);
}

/* To be used with WRITE_CACHE and EXTRA_CACHE */

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


int ha_maria::delete_all_rows()
{
  return maria_delete_all_rows(file);
}


int ha_maria::delete_table(const char *name)
{
  return maria_delete_table(name);
}

#define THD_TRN (*(TRN **)thd_ha_data(thd, maria_hton))

int ha_maria::external_lock(THD *thd, int lock_type)
{
  TRN *trn= THD_TRN;
  DBUG_ENTER("ha_maria::external_lock");
  /*
    We don't test now_transactional because it may vary between lock/unlock
    and thus confuse our reference counting.
    It is critical to skip non-transactional tables: user-visible temporary
    tables get an external_lock() when read/written for the first time, but no
    corresponding unlock (they just stay locked and are later dropped while
    locked); if a tmp table was transactional, "SELECT FROM non_tmp, tmp"
    would never commit as its "locked_tables" count would stay 1.
    When Maria has has_transactions()==TRUE, open_temporary_table()
    (sql_base.cc) will use TRANSACTIONAL_TMP_TABLE and thus the
    external_lock(F_UNLCK) will happen and we can then allow the user to
    create transactional temporary tables.
  */
  if (!file->s->base.born_transactional)
    goto skip_transaction;
  if (lock_type != F_UNLCK)
  {
    if (!thd->transaction.on)
    {
      /*
        No need to log REDOs/UNDOs. If this is an internal temporary table
        which will be renamed to a permanent table (like in ALTER TABLE),
        the rename happens after unlocking so will be durable (and the table
        will get its create_rename_lsn).
        Note: if we wanted to enable users to have an old backup and apply
        tons of archived logs to roll-forward, we could then not disable
        REDOs/UNDOs in this case.
      */
      DBUG_PRINT("info", ("Disabling logging for table"));
      _ma_tmp_disable_logging_for_table(file->s);
    }
    if (!trn)  /* no transaction yet - open it now */
    {
      trn= trnman_new_trn(& thd->mysys_var->mutex,
                          & thd->mysys_var->suspend,
                          thd->thread_stack + STACK_DIRECTION *
                          (my_thread_stack_size - STACK_MIN_SIZE));
      if (unlikely(!trn))
        DBUG_RETURN(HA_ERR_OUT_OF_MEM);

      DBUG_PRINT("info", ("THD_TRN set to 0x%lx", (ulong)trn));
      THD_TRN= trn;
      if (thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))
        trans_register_ha(thd, TRUE, maria_hton);
    }
    this->file->trn= trn;
    if (!trnman_increment_locked_tables(trn))
    {
      trans_register_ha(thd, FALSE, maria_hton);
      trnman_new_statement(trn);
    }
  }
  else
  {
    _ma_reenable_logging_for_table(file->s);
    this->file->trn= 0; /* TODO: remove it also in commit and rollback */
    if (trn && trnman_has_locked_tables(trn))
    {
      if (!trnman_decrement_locked_tables(trn))
      {
        /* autocommit ? rollback a transaction */
#ifdef MARIA_CANNOT_ROLLBACK
        if (ma_commit(trn))
          DBUG_RETURN(1);
        THD_TRN= 0;
#else
        if (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)))
        {
          trnman_rollback_trn(trn);
          DBUG_PRINT("info", ("THD_TRN set to 0x0"));
          THD_TRN= 0;
        }
#endif
      }
    }
  }
skip_transaction:
  DBUG_RETURN(maria_lock_database(file, !table->s->tmp_table ?
                                  lock_type : ((lock_type == F_UNLCK) ?
                                               F_UNLCK : F_EXTRA_LCK)));
}

int ha_maria::start_stmt(THD *thd, thr_lock_type lock_type)
{
  TRN *trn= THD_TRN;
  if (file->s->base.born_transactional)
  {
    DBUG_ASSERT(trn); // this may be called only after external_lock()
    DBUG_ASSERT(trnman_has_locked_tables(trn));
    DBUG_ASSERT(lock_type != F_UNLCK);
    /*
      As external_lock() was already called, don't increment locked_tables.
      Note that we call the function below possibly several times when
      statement starts (once per table). This is ok as long as that function
      does cheap operations. Otherwise, we will need to do it only on first
      call to start_stmt().
    */
    trnman_new_statement(trn);
  }
  return 0;
}

THR_LOCK_DATA **ha_maria::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_maria::update_create_info(HA_CREATE_INFO *create_info)
{
  ha_maria::info(HA_STATUS_AUTO | HA_STATUS_CONST);
  if (!(create_info->used_fields & HA_CREATE_USED_AUTO))
  {
    create_info->auto_increment_value= stats.auto_increment_value;
  }
  create_info->data_file_name= data_file_name;
  create_info->index_file_name= index_file_name;
}


enum row_type ha_maria::get_row_type() const
{
  switch (file->s->data_file_type) {
  case STATIC_RECORD:     return ROW_TYPE_FIXED;
  case DYNAMIC_RECORD:    return ROW_TYPE_DYNAMIC;
  case BLOCK_RECORD:      return ROW_TYPE_PAGE;
  case COMPRESSED_RECORD: return ROW_TYPE_COMPRESSED;
  default:                return ROW_TYPE_NOT_USED;
  }
}


static enum data_file_type maria_row_type(HA_CREATE_INFO *info)
{
  if (info->transactional == HA_CHOICE_YES)
    return BLOCK_RECORD;
  switch (info->row_type) {
  case ROW_TYPE_FIXED:   return STATIC_RECORD;
  case ROW_TYPE_DYNAMIC: return DYNAMIC_RECORD;
  default:               return BLOCK_RECORD;
  }
}


int ha_maria::create(const char *name, register TABLE *table_arg,
                     HA_CREATE_INFO *ha_create_info)
{
  int error;
  uint create_flags= 0, records, i;
  char buff[FN_REFLEN];
  MARIA_KEYDEF *keydef;
  MARIA_COLUMNDEF *recinfo;
  MARIA_CREATE_INFO create_info;
  TABLE_SHARE *share= table_arg->s;
  uint options= share->db_options_in_use;
  enum data_file_type row_type;
  DBUG_ENTER("ha_maria::create");

  for (i= 0; i < share->keys; i++)
  {
    if (table_arg->key_info[i].flags & HA_USES_PARSER)
    {
      create_flags|= HA_CREATE_RELIES_ON_SQL_LAYER;
      break;
    }
  }
  row_type= maria_row_type(ha_create_info);
  if ((error= table2maria(table_arg, &keydef, &recinfo, &records)))
    DBUG_RETURN(error); /* purecov: inspected */
  bzero((char*) &create_info, sizeof(create_info));
  create_info.max_rows= share->max_rows;
  create_info.reloc_rows= share->min_rows;
  create_info.with_auto_increment= share->next_number_key_offset == 0;
  create_info.auto_increment= (ha_create_info->auto_increment_value ?
                               ha_create_info->auto_increment_value -1 :
                               (ulonglong) 0);
  create_info.data_file_length= ((ulonglong) share->max_rows *
                                 share->avg_row_length);
  create_info.data_file_name= ha_create_info->data_file_name;
  create_info.index_file_name= ha_create_info->index_file_name;
#ifdef ASK_MONTY
  /**
     @todo ASK_MONTY
    Where "transactional" in the frm and in the engine can go out of sync.
    Don't we want to do, after the setting, this test:
    if (!create_info.transactional &&
        ha_create_info->transactional == HA_CHOICE_YES)
      error;
      ?
    Why fool the user?
    Shouldn't this test be pushed down to maria_create()? Because currently,
    ma_test1 -T crashes: it creates a table with DYNAMIC_RECORD but has
    born_transactional==1, which confuses some recovery-related code.
  */
#endif
  create_info.transactional= (row_type == BLOCK_RECORD &&
                              ha_create_info->transactional != HA_CHOICE_NO);

  if (ha_create_info->options & HA_LEX_CREATE_TMP_TABLE)
    create_flags|= HA_CREATE_TMP_TABLE;
  if (ha_create_info->options & HA_CREATE_KEEP_FILES)
    create_flags|= HA_CREATE_KEEP_FILES;
  if (options & HA_OPTION_PACK_RECORD)
    create_flags|= HA_PACK_RECORD;
  if (options & HA_OPTION_CHECKSUM)
    create_flags|= HA_CREATE_CHECKSUM;
  if (options & HA_OPTION_DELAY_KEY_WRITE)
    create_flags|= HA_CREATE_DELAY_KEY_WRITE;

  /* TODO: Check that the following fn_format is really needed */
  error=
    maria_create(fn_format(buff, name, "", "",
                           MY_UNPACK_FILENAME | MY_APPEND_EXT),
                 row_type, share->keys, keydef,
                 records,  recinfo,
                 0, (MARIA_UNIQUEDEF *) 0,
                 &create_info, create_flags);

  my_free((uchar*) recinfo, MYF(0));
  DBUG_RETURN(error);
}


int ha_maria::rename_table(const char *from, const char *to)
{
  return maria_rename(from, to);
}


void ha_maria::get_auto_increment(ulonglong offset, ulonglong increment,
                                  ulonglong nb_desired_values,
                                  ulonglong *first_value,
                                  ulonglong *nb_reserved_values)
{
  ulonglong nr;
  int error;
  uchar key[HA_MAX_KEY_LENGTH];

  if (!table->s->next_number_key_offset)
  {                                             // Autoincrement at key-start
    ha_maria::info(HA_STATUS_AUTO);
    *first_value= stats.auto_increment_value;
    /* Maria has only table-level lock for now, so reserves to +inf */
    *nb_reserved_values= ULONGLONG_MAX;
    return;
  }

  /* it's safe to call the following if bulk_insert isn't on */
  maria_flush_bulk_insert(file, table->s->next_number_index);

  (void) extra(HA_EXTRA_KEYREAD);
  key_copy(key, table->record[0],
           table->key_info + table->s->next_number_index,
           table->s->next_number_key_offset);
  error= maria_rkey(file, table->record[1], (int) table->s->next_number_index,
                    key, make_prev_keypart_map(table->s->next_number_keypart),
                    HA_READ_PREFIX_LAST);
  if (error)
    nr= 1;
  else
  {
    /* Get data from record[1] */
    nr= ((ulonglong) table->next_number_field->
         val_int_offset(table->s->rec_buff_length) + 1);
  }
  extra(HA_EXTRA_NO_KEYREAD);
  *first_value= nr;
  /*
    MySQL needs to call us for next row: assume we are inserting ("a",null)
    here, we return 3, and next this statement will want to insert ("b",null):
    there is no reason why ("b",3+1) would be the good row to insert: maybe it
    already exists, maybe 3+1 is too large...
  */
  *nb_reserved_values= 1;
}


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

  SYNOPSIS
    records_in_range()
    inx                 Index to use
    min_key             Start of range.  Null pointer if from first key
    max_key             End of range. Null pointer if to last key

  NOTES
    min_key.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

    max_key.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_maria::records_in_range(uint inx, key_range *min_key,
                                   key_range *max_key)
{
  return (ha_rows) maria_records_in_range(file, (int) inx, min_key, max_key);
}


int ha_maria::ft_read(uchar * buf)
{
  int error;

  if (!ft_handler)
    return -1;

  thread_safe_increment(table->in_use->status_var.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;
}


uint ha_maria::checksum() const
{
  return (uint) file->state->checksum;
}


bool ha_maria::check_if_incompatible_data(HA_CREATE_INFO *info,
                                          uint table_changes)
{
  uint options= table->s->db_options_in_use;

  if (info->auto_increment_value != stats.auto_increment_value ||
      info->data_file_name != data_file_name ||
      info->index_file_name != index_file_name ||
      maria_row_type(info) != data_file_type ||
      table_changes == IS_EQUAL_NO ||
      table_changes & IS_EQUAL_PACK_LENGTH) // Not implemented yet
    return COMPATIBLE_DATA_NO;

  if ((options & (HA_OPTION_PACK_RECORD | HA_OPTION_CHECKSUM |
                  HA_OPTION_DELAY_KEY_WRITE)) !=
      (info->table_options & (HA_OPTION_PACK_RECORD | HA_OPTION_CHECKSUM |
                              HA_OPTION_DELAY_KEY_WRITE)))
    return COMPATIBLE_DATA_NO;
  return COMPATIBLE_DATA_YES;
}


static int maria_hton_panic(handlerton *hton, ha_panic_function flag)
{
  ma_checkpoint_execute(CHECKPOINT_FULL, FALSE); /* can't catch error */
  return maria_panic(flag);
}


static int maria_commit(handlerton *hton __attribute__ ((unused)),
                        THD *thd, bool all)
{
  TRN *trn= THD_TRN;
  DBUG_ENTER("maria_commit");
  trnman_reset_locked_tables(trn);
  /* statement or transaction ? */
  if ((thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)) && !all)
    DBUG_RETURN(0); // end of statement
  DBUG_PRINT("info", ("THD_TRN set to 0x0"));
  THD_TRN= 0;
  DBUG_RETURN(ma_commit(trn)); // end of transaction
}


static int maria_rollback(handlerton *hton __attribute__ ((unused)),
                          THD *thd, bool all)
{
  TRN *trn= THD_TRN;
  DBUG_ENTER("maria_rollback");
  trnman_reset_locked_tables(trn);
  /* statement or transaction ? */
  if ((thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)) && !all)
  {
    trnman_rollback_statement(trn);
    DBUG_RETURN(0); // end of statement
  }
  DBUG_PRINT("info", ("THD_TRN set to 0x0"));
  THD_TRN= 0;
  DBUG_RETURN(trnman_rollback_trn(trn) ?
              HA_ERR_OUT_OF_MEM : 0); // end of transaction
}


static int ha_maria_init(void *p)
{
  int res;
  maria_hton= (handlerton *)p;
  maria_hton->state= SHOW_OPTION_YES;
  maria_hton->db_type= DB_TYPE_MARIA;
  maria_hton->create= maria_create_handler;
  maria_hton->panic= maria_hton_panic;
  maria_hton->commit= maria_commit;
  maria_hton->rollback= maria_rollback;
  /* TODO: decide if we support Maria being used for log tables */
  maria_hton->flags= HTON_CAN_RECREATE | HTON_SUPPORT_LOG_TABLES;
  bzero(maria_log_pagecache, sizeof(*maria_log_pagecache));
  maria_data_root= mysql_real_data_home;
  res= maria_init() || ma_control_file_create_or_open() ||
    (init_pagecache(maria_log_pagecache,
                    TRANSLOG_PAGECACHE_SIZE, 0, 0,
                    TRANSLOG_PAGE_SIZE) == 0) ||
    translog_init(maria_data_root, TRANSLOG_FILE_SIZE,
                  MYSQL_VERSION_ID, server_id, maria_log_pagecache,
                  TRANSLOG_DEFAULT_FLAGS) ||
    maria_recover() ||
    ma_checkpoint_init(TRUE);
  maria_multi_threaded= TRUE;
  return res;
}


#ifdef HAVE_QUERY_CACHE
/**
  @brief Register a named table with a call back function to the query cache.

  @param thd The thread handle
  @param table_key A pointer to the table name in the table cache
  @param key_length The length of the table name
  @param[out] engine_callback The pointer to the storage engine call back
    function, currently 0
  @param[out] engine_data Engine data will be set to 0.

  @note Despite the name of this function, it is used to check each statement
    before it is cached and not to register a table or callback function.

  @see handler::register_query_cache_table

  @return The error code. The engine_data and engine_callback will be set to 0.
    @retval TRUE Success
    @retval FALSE An error occured
*/

my_bool ha_maria::register_query_cache_table(THD *thd, char *table_name,
					     uint table_name_len,
					     qc_engine_callback
					     *engine_callback,
					     ulonglong *engine_data)
{
  /*
    No call back function is needed to determine if a cached statement
    is valid or not.
  */
  *engine_callback= 0;

  /*
    No engine data is needed.
  */
  *engine_data= 0;

  /*
    If a concurrent INSERT has happened just before the currently processed
    SELECT statement, the total size of the table is unknown.

    To determine if the table size is known, the current thread's snap shot of
    the table size with the actual table size are compared.

    If the table size is unknown the SELECT statement can't be cached.
  */
  ulonglong actual_data_file_length;
  ulonglong current_data_file_length;

  /*
    POSIX visibility rules specify that "2. Whatever memory values a
    thread can see when it unlocks a mutex <...> can also be seen by any
    thread that later locks the same mutex". In this particular case,
    concurrent insert thread had modified the data_file_length in
    MYISAM_SHARE before it has unlocked (or even locked)
    structure_guard_mutex. So, here we're guaranteed to see at least that
    value after we've locked the same mutex. We can see a later value
    (modified by some other thread) though, but it's ok, as we only want
    to know if the variable was changed, the actual new value doesn't matter
  */
  actual_data_file_length= file->s->state.state.data_file_length;
  current_data_file_length= file->save_state.data_file_length;

  if (current_data_file_length != actual_data_file_length)
  {
    /* Don't cache current statement. */
    return FALSE;
  }

  /* It is ok to try to cache current statement. */
  return TRUE;
}
#endif

static struct st_mysql_sys_var* system_variables[]= {
  MYSQL_SYSVAR(block_size),
  MYSQL_SYSVAR(checkpoint_frequency),
  MYSQL_SYSVAR(max_sort_file_size),
  MYSQL_SYSVAR(repair_threads),
  MYSQL_SYSVAR(sort_buffer_size),
  MYSQL_SYSVAR(stats_method),
  NULL
};


/**
   @brief Updates the checkpoint frequency and restarts the background thread.

   Background thread has a loop which correctness depends on a constant
   checkpoint frequency. So when the user wants to modify it, we stop and
   restart the thread.
*/
static void update_checkpoint_frequency(MYSQL_THD thd,
                                        struct st_mysql_sys_var *var,
                                        void *var_ptr, void *save)
{
  ulong new_value= (ulong)(*(long *)save), *dest= (ulong *)var_ptr;
  if (new_value != *dest) /* it's actually a change */
  {
    ma_checkpoint_end();
    *dest= new_value;
    ma_checkpoint_init(TRUE);
  }
}


struct st_mysql_storage_engine maria_storage_engine=
{ MYSQL_HANDLERTON_INTERFACE_VERSION };

mysql_declare_plugin(maria)
{
  MYSQL_STORAGE_ENGINE_PLUGIN,
  &maria_storage_engine,
  "MARIA",
  "MySQL AB",
  "Traditional transactional MySQL tables",
  PLUGIN_LICENSE_GPL,
  ha_maria_init,              /* Plugin Init                     */
  NULL,                       /* Plugin Deinit                   */
  0x0100,                     /* 1.0                             */
  NULL,                       /* status variables                */
  system_variables,           /* system variables                */
  NULL
}
mysql_declare_plugin_end;