mariadb/storage/maria/ma_open.c

/* Copyright (C) 2006 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 */

/* open a isam-database */

#include "ma_fulltext.h"
#include "ma_sp_defs.h"
#include "ma_rt_index.h"
#include "ma_blockrec.h"
#include <m_ctype.h>

#if defined(MSDOS) || defined(__WIN__)
#ifdef __WIN__
#include <fcntl.h>
#else
#include <process.h>			/* Prototype for getpid */
#endif
#endif
#ifdef VMS
#include "static.c"
#endif

static void setup_key_functions(MARIA_KEYDEF *keyinfo);
static my_bool maria_scan_init_dummy(MARIA_HA *info);
static void maria_scan_end_dummy(MARIA_HA *info);
static my_bool maria_once_init_dummy(MARIA_SHARE *, File);
static my_bool maria_once_end_dummy(MARIA_SHARE *);
static byte *_ma_base_info_read(byte *ptr, MARIA_BASE_INFO *base);

#define get_next_element(to,pos,size) { memcpy((char*) to,pos,(size_t) size); \
					pos+=size;}


#define disk_pos_assert(pos, end_pos) \
if (pos > end_pos)             \
{                              \
  my_errno=HA_ERR_CRASHED;     \
  goto err;                    \
}


/******************************************************************************
** Return the shared struct if the table is already open.
** In MySQL the server will handle version issues.
******************************************************************************/

MARIA_HA *_ma_test_if_reopen(char *filename)
{
  LIST *pos;

  for (pos=maria_open_list ; pos ; pos=pos->next)
  {
    MARIA_HA *info=(MARIA_HA*) pos->data;
    MARIA_SHARE *share=info->s;
    if (!strcmp(share->unique_file_name,filename) && share->last_version)
      return info;
  }
  return 0;
}


/******************************************************************************
  open a MARIA database.
  See my_base.h for the handle_locking argument
  if handle_locking and HA_OPEN_ABORT_IF_CRASHED then abort if the table
  is marked crashed or if we are not using locking and the table doesn't
  have an open count of 0.
******************************************************************************/

MARIA_HA *maria_open(const char *name, int mode, uint open_flags)
{
  int kfile,open_mode,save_errno,have_rtree=0;
  uint i,j,len,errpos,head_length,base_pos,info_length,keys,
    key_parts,unique_key_parts,fulltext_keys,uniques;
  char name_buff[FN_REFLEN], org_name[FN_REFLEN], index_name[FN_REFLEN],
       data_name[FN_REFLEN];
  char *disk_cache, *disk_pos, *end_pos;
  MARIA_HA info,*m_info,*old_info;
  MARIA_SHARE share_buff,*share;
  ulong rec_per_key_part[HA_MAX_POSSIBLE_KEY*HA_MAX_KEY_SEG];
  my_off_t key_root[HA_MAX_POSSIBLE_KEY];
  ulonglong max_key_file_length, max_data_file_length;
  DBUG_ENTER("maria_open");

  LINT_INIT(m_info);
  kfile= -1;
  errpos= 0;
  head_length=sizeof(share_buff.state.header);
  bzero((byte*) &info,sizeof(info));

  my_realpath(name_buff, fn_format(org_name,name,"",MARIA_NAME_IEXT,
                                   MY_UNPACK_FILENAME),MYF(0));
  pthread_mutex_lock(&THR_LOCK_maria);
  if (!(old_info=_ma_test_if_reopen(name_buff)))
  {
    share= &share_buff;
    bzero((gptr) &share_buff,sizeof(share_buff));
    share_buff.state.rec_per_key_part=rec_per_key_part;
    share_buff.state.key_root=key_root;
    share_buff.pagecache= multi_pagecache_search(name_buff, strlen(name_buff),
                                                 maria_pagecache);

    DBUG_EXECUTE_IF("maria_pretend_crashed_table_on_open",
                    if (strstr(name, "/t1"))
                    {
                      my_errno= HA_ERR_CRASHED;
                      goto err;
                    });
    if ((kfile=my_open(name_buff,(open_mode=O_RDWR) | O_SHARE,MYF(0))) < 0)
    {
      if ((errno != EROFS && errno != EACCES) ||
	  mode != O_RDONLY ||
	  (kfile=my_open(name_buff,(open_mode=O_RDONLY) | O_SHARE,MYF(0))) < 0)
	goto err;
    }
    share->mode=open_mode;
    errpos= 1;
    if (my_read(kfile,(char*) share->state.header.file_version,head_length,
		MYF(MY_NABP)))
    {
      my_errno= HA_ERR_NOT_A_TABLE;
      goto err;
    }
    if (memcmp((byte*) share->state.header.file_version,
	       (byte*) maria_file_magic, 4))
    {
      DBUG_PRINT("error",("Wrong header in %s",name_buff));
      DBUG_DUMP("error_dump",(char*) share->state.header.file_version,
		head_length);
      my_errno=HA_ERR_NOT_A_TABLE;
      goto err;
    }
    share->options= mi_uint2korr(share->state.header.options);
    if (share->options &
	~(HA_OPTION_PACK_RECORD | HA_OPTION_PACK_KEYS |
	  HA_OPTION_COMPRESS_RECORD | HA_OPTION_READ_ONLY_DATA |
	  HA_OPTION_TEMP_COMPRESS_RECORD | HA_OPTION_CHECKSUM |
          HA_OPTION_TMP_TABLE | HA_OPTION_DELAY_KEY_WRITE |
          HA_OPTION_RELIES_ON_SQL_LAYER))
    {
      DBUG_PRINT("error",("wrong options: 0x%lx", share->options));
      my_errno=HA_ERR_OLD_FILE;
      goto err;
    }
    if ((share->options & HA_OPTION_RELIES_ON_SQL_LAYER) &&
        ! (open_flags & HA_OPEN_FROM_SQL_LAYER))
    {
      DBUG_PRINT("error", ("table cannot be openned from non-sql layer"));
      my_errno= HA_ERR_UNSUPPORTED;
      goto err;
    }
    /* Don't call realpath() if the name can't be a link */
    if (!strcmp(name_buff, org_name) ||
        my_readlink(index_name, org_name, MYF(0)) == -1)
      (void) strmov(index_name, org_name);
    *strrchr(org_name, '.')= '\0';
    (void) fn_format(data_name,org_name,"",MARIA_NAME_DEXT,
                     MY_APPEND_EXT|MY_UNPACK_FILENAME|MY_RESOLVE_SYMLINKS);

    info_length=mi_uint2korr(share->state.header.header_length);
    base_pos= mi_uint2korr(share->state.header.base_pos);
    if (!(disk_cache=(char*) my_alloca(info_length+128)))
    {
      my_errno=ENOMEM;
      goto err;
    }
    end_pos=disk_cache+info_length;
    errpos= 2;

    VOID(my_seek(kfile,0L,MY_SEEK_SET,MYF(0)));
    errpos= 3;
    if (my_read(kfile,disk_cache,info_length,MYF(MY_NABP)))
    {
      my_errno=HA_ERR_CRASHED;
      goto err;
    }
    len=mi_uint2korr(share->state.header.state_info_length);
    keys=    (uint) share->state.header.keys;
    uniques= (uint) share->state.header.uniques;
    fulltext_keys= (uint) share->state.header.fulltext_keys;
    key_parts= mi_uint2korr(share->state.header.key_parts);
    unique_key_parts= mi_uint2korr(share->state.header.unique_key_parts);
    if (len != MARIA_STATE_INFO_SIZE)
    {
      DBUG_PRINT("warning",
		 ("saved_state_info_length: %d  state_info_length: %d",
		  len,MARIA_STATE_INFO_SIZE));
    }
    share->state_diff_length=len-MARIA_STATE_INFO_SIZE;

    _ma_state_info_read(disk_cache, &share->state);
    len= mi_uint2korr(share->state.header.base_info_length);
    if (len != MARIA_BASE_INFO_SIZE)
    {
      DBUG_PRINT("warning",("saved_base_info_length: %d  base_info_length: %d",
			    len,MARIA_BASE_INFO_SIZE));
    }
    disk_pos= _ma_base_info_read(disk_cache + base_pos, &share->base);
    share->state.state_length=base_pos;

    if (!(open_flags & HA_OPEN_FOR_REPAIR) &&
	((share->state.changed & STATE_CRASHED) ||
	 ((open_flags & HA_OPEN_ABORT_IF_CRASHED) &&
	  (my_disable_locking && share->state.open_count))))
    {
      DBUG_PRINT("error",("Table is marked as crashed. open_flags: %u  "
                          "changed: %u  open_count: %u  !locking: %d",
                          open_flags, share->state.changed,
                          share->state.open_count, my_disable_locking));
      my_errno=((share->state.changed & STATE_CRASHED_ON_REPAIR) ?
		HA_ERR_CRASHED_ON_REPAIR : HA_ERR_CRASHED_ON_USAGE);
      goto err;
    }

    /* sanity check */
    if (share->base.keystart > 65535 || share->base.rec_reflength > 8)
    {
      my_errno=HA_ERR_CRASHED;
      goto err;
    }

    key_parts+=fulltext_keys*FT_SEGS;
    if (share->base.max_key_length > maria_max_key_length() ||
        keys > MARIA_MAX_KEY || key_parts >= MARIA_MAX_KEY * HA_MAX_KEY_SEG)
    {
      DBUG_PRINT("error",("Wrong key info:  Max_key_length: %d  keys: %d  key_parts: %d", share->base.max_key_length, keys, key_parts));
      my_errno=HA_ERR_UNSUPPORTED;
      goto err;
    }
    if (share->base.block_size != maria_block_size)
    {
      DBUG_PRINT("error", ("Wrong block size %u; Expected %u",
                           (uint) share->base.block_size,
                           (uint) maria_block_size));
      my_errno=HA_ERR_UNSUPPORTED;
      goto err;
    }

    /* Correct max_file_length based on length of sizeof(off_t) */
    max_data_file_length=
      (share->options & (HA_OPTION_PACK_RECORD | HA_OPTION_COMPRESS_RECORD)) ?
      (((ulonglong) 1 << (share->base.rec_reflength*8))-1) :
      (_ma_safe_mul(share->base.pack_reclength,
		   (ulonglong) 1 << (share->base.rec_reflength*8))-1);

    max_key_file_length=
      _ma_safe_mul(MARIA_MIN_KEY_BLOCK_LENGTH,
		  ((ulonglong) 1 << (share->base.key_reflength*8))-1);
#if SIZEOF_OFF_T == 4
    set_if_smaller(max_data_file_length, INT_MAX32);
    set_if_smaller(max_key_file_length, INT_MAX32);
#endif
    share->base.max_data_file_length=(my_off_t) max_data_file_length;
    share->base.max_key_file_length=(my_off_t) max_key_file_length;

    if (share->options & HA_OPTION_COMPRESS_RECORD)
      share->base.max_key_length+=2;	/* For safety */

    if (!my_multi_malloc(MY_WME,
			 &share,sizeof(*share),
			 &share->state.rec_per_key_part,sizeof(long)*key_parts,
			 &share->keyinfo,keys*sizeof(MARIA_KEYDEF),
			 &share->uniqueinfo,uniques*sizeof(MARIA_UNIQUEDEF),
			 &share->keyparts,
			 (key_parts+unique_key_parts+keys+uniques) *
			 sizeof(HA_KEYSEG),
			 &share->columndef,
			 (share->base.fields+1)*sizeof(MARIA_COLUMNDEF),
			 &share->blobs,sizeof(MARIA_BLOB)*share->base.blobs,
			 &share->unique_file_name,strlen(name_buff)+1,
			 &share->index_file_name,strlen(index_name)+1,
			 &share->data_file_name,strlen(data_name)+1,
			 &share->state.key_root,keys*sizeof(my_off_t),
#ifdef THREAD
			 &share->key_root_lock,sizeof(rw_lock_t)*keys,
#endif
			 &share->mmap_lock,sizeof(rw_lock_t),
			 NullS))
      goto err;
    errpos= 4;

    *share=share_buff;
    memcpy((char*) share->state.rec_per_key_part,
	   (char*) rec_per_key_part, sizeof(long)*key_parts);
    memcpy((char*) share->state.key_root,
	   (char*) key_root, sizeof(my_off_t)*keys);
    strmov(share->unique_file_name, name_buff);
    share->unique_name_length= strlen(name_buff);
    strmov(share->index_file_name,  index_name);
    strmov(share->data_file_name,   data_name);

    share->block_size= maria_block_size;
    {
      HA_KEYSEG *pos=share->keyparts;
      for (i=0 ; i < keys ; i++)
      {
        share->keyinfo[i].share= share;
	disk_pos=_ma_keydef_read(disk_pos, &share->keyinfo[i]);
        disk_pos_assert(disk_pos + share->keyinfo[i].keysegs * HA_KEYSEG_SIZE,
 			end_pos);
        if (share->keyinfo[i].key_alg == HA_KEY_ALG_RTREE)
          have_rtree=1;
	share->keyinfo[i].seg=pos;
	for (j=0 ; j < share->keyinfo[i].keysegs; j++,pos++)
	{
	  disk_pos=_ma_keyseg_read(disk_pos, pos);
	  if (pos->type == HA_KEYTYPE_TEXT ||
              pos->type == HA_KEYTYPE_VARTEXT1 ||
              pos->type == HA_KEYTYPE_VARTEXT2)
	  {
	    if (!pos->language)
	      pos->charset=default_charset_info;
	    else if (!(pos->charset= get_charset(pos->language, MYF(MY_WME))))
	    {
	      my_errno=HA_ERR_UNKNOWN_CHARSET;
	      goto err;
	    }
	  }
	  else if (pos->type == HA_KEYTYPE_BINARY)
	    pos->charset= &my_charset_bin;
	}
	if (share->keyinfo[i].flag & HA_SPATIAL)
	{
#ifdef HAVE_SPATIAL
	  uint sp_segs=SPDIMS*2;
	  share->keyinfo[i].seg=pos-sp_segs;
	  share->keyinfo[i].keysegs--;
#else
	  my_errno=HA_ERR_UNSUPPORTED;
	  goto err;
#endif
	}
        else if (share->keyinfo[i].flag & HA_FULLTEXT)
	{
          if (!fulltext_keys)
          { /* 4.0 compatibility code, to be removed in 5.0 */
            share->keyinfo[i].seg=pos-FT_SEGS;
            share->keyinfo[i].keysegs-=FT_SEGS;
          }
          else
          {
            uint k;
            share->keyinfo[i].seg=pos;
            for (k=0; k < FT_SEGS; k++)
            {
              *pos= ft_keysegs[k];
              pos[0].language= pos[-1].language;
              if (!(pos[0].charset= pos[-1].charset))
              {
                my_errno=HA_ERR_CRASHED;
                goto err;
              }
              pos++;
            }
          }
          if (!share->ft2_keyinfo.seg)
          {
            memcpy(& share->ft2_keyinfo, & share->keyinfo[i], sizeof(MARIA_KEYDEF));
            share->ft2_keyinfo.keysegs=1;
            share->ft2_keyinfo.flag=0;
            share->ft2_keyinfo.keylength=
            share->ft2_keyinfo.minlength=
            share->ft2_keyinfo.maxlength=HA_FT_WLEN+share->base.rec_reflength;
            share->ft2_keyinfo.seg=pos-1;
            share->ft2_keyinfo.end=pos;
            setup_key_functions(& share->ft2_keyinfo);
          }
	}
        setup_key_functions(share->keyinfo+i);
	share->keyinfo[i].end=pos;
	pos->type=HA_KEYTYPE_END;			/* End */
	pos->length=share->base.rec_reflength;
	pos->null_bit=0;
	pos->flag=0;					/* For purify */
	pos++;
      }
      for (i=0 ; i < uniques ; i++)
      {
	disk_pos=_ma_uniquedef_read(disk_pos, &share->uniqueinfo[i]);
        disk_pos_assert(disk_pos + share->uniqueinfo[i].keysegs *
			HA_KEYSEG_SIZE, end_pos);
	share->uniqueinfo[i].seg=pos;
	for (j=0 ; j < share->uniqueinfo[i].keysegs; j++,pos++)
	{
	  disk_pos=_ma_keyseg_read(disk_pos, pos);
	  if (pos->type == HA_KEYTYPE_TEXT ||
              pos->type == HA_KEYTYPE_VARTEXT1 ||
              pos->type == HA_KEYTYPE_VARTEXT2)
	  {
	    if (!pos->language)
	      pos->charset=default_charset_info;
	    else if (!(pos->charset= get_charset(pos->language, MYF(MY_WME))))
	    {
	      my_errno=HA_ERR_UNKNOWN_CHARSET;
	      goto err;
	    }
	  }
	}
	share->uniqueinfo[i].end=pos;
	pos->type=HA_KEYTYPE_END;			/* End */
	pos->null_bit=0;
	pos->flag=0;
	pos++;
      }
      share->ftparsers= 0;
    }
    share->data_file_type= share->state.header.data_file_type;
    share->base_length= (BASE_ROW_HEADER_SIZE +
                         share->base.is_nulls_extended +
                         share->base.null_bytes +
                         share->base.pack_bytes +
                         test(share->options & HA_OPTION_CHECKSUM));
    if (share->base.transactional)
      share->base_length+= TRANS_ROW_EXTRA_HEADER_SIZE;
    share->base.default_rec_buff_size= max(share->base.pack_reclength,
                                           share->base.max_key_length);
    if (share->data_file_type == DYNAMIC_RECORD)
    {
      share->base.extra_rec_buff_size=
        (ALIGN_SIZE(MARIA_MAX_DYN_BLOCK_HEADER) + MARIA_SPLIT_LENGTH +
         MARIA_REC_BUFF_OFFSET);
      share->base.default_rec_buff_size+= share->base.extra_rec_buff_size;
    }
    disk_pos_assert(disk_pos + share->base.fields *MARIA_COLUMNDEF_SIZE,
                    end_pos);
    for (i= j= 0 ; i < share->base.fields ; i++)
    {
      disk_pos=_ma_columndef_read(disk_pos,&share->columndef[i]);
      share->columndef[i].pack_type=0;
      share->columndef[i].huff_tree=0;
      if (share->columndef[i].type == (int) FIELD_BLOB)
      {
	share->blobs[j].pack_length=
	  share->columndef[i].length-portable_sizeof_char_ptr;;
	share->blobs[j].offset= share->columndef[i].offset;
	j++;
      }
    }
    share->columndef[i].type=(int) FIELD_LAST;	/* End marker */
#ifdef ASKMONTY
    /*
      This code was added to mi_open.c in this cset:
      "ChangeSet 1.1616.2941.5 2007/01/22 16:34:58 svoj@mysql.com
      BUG#24401 - MySQL server crashes if you try to retrieve data from
      corrupted table
      Accessing a table with corrupted column definition results in server
      crash.
      This is fixed by refusing to open such tables. Affects MyISAM only.
      No test case, since it requires crashed table.
      storage/myisam/mi_open.c 1.80.2.10 2007/01/22 16:34:57 svoj@mysql.com
      Refuse to open MyISAM table with summary columns length bigger than
      length of the record."

      The problem is that the "offset" variable was removed (by Monty in the
      rows-in-block patch). Monty will know how to merge that.
      Guilhem will make sure to notify him.
    */
    if (offset > share->base.reclength)
    {
      /* purecov: begin inspected */
      my_errno= HA_ERR_CRASHED;
      goto err;
      /* purecov: end */
    }
#endif /* ASKMONTY */

    if (_ma_open_datafile(&info, share, -1))
      goto err;
    errpos= 5;

    share->kfile.file= kfile;
    share->this_process=(ulong) getpid();
    share->last_process= share->state.process;
    share->base.key_parts=key_parts;
    share->base.all_key_parts=key_parts+unique_key_parts;
    if (!(share->last_version=share->state.version))
      share->last_version=1;			/* Safety */
    share->rec_reflength=share->base.rec_reflength; /* May be changed */
    share->base.margin_key_file_length=(share->base.max_key_file_length -
					(keys ? MARIA_INDEX_BLOCK_MARGIN *
					 share->block_size * keys : 0));
    share->block_size= share->base.block_size;
    my_afree((gptr) disk_cache);
    _ma_setup_functions(share);
    if ((*share->once_init)(share, info.dfile.file))
      goto err;
    if (open_flags & HA_OPEN_MMAP)
    {
      info.s= share;
      if (_ma_dynmap_file(&info, share->state.state.data_file_length))
      {
        /* purecov: begin inspected */
        /* Ignore if mmap fails. Use file I/O instead. */
        DBUG_PRINT("warning", ("mmap failed: errno: %d", errno));
        /* purecov: end */
      }
      else
      {
        share->file_read= _ma_mmap_pread;
        share->file_write= _ma_mmap_pwrite;
      }
    }
    share->is_log_table= FALSE;
#ifdef THREAD
    thr_lock_init(&share->lock);
    VOID(pthread_mutex_init(&share->intern_lock,MY_MUTEX_INIT_FAST));
    for (i=0; i<keys; i++)
      VOID(my_rwlock_init(&share->key_root_lock[i], NULL));
    VOID(my_rwlock_init(&share->mmap_lock, NULL));
    if (!thr_lock_inited)
    {
      /* Probably a single threaded program; Don't use concurrent inserts */
      maria_concurrent_insert=0;
    }
    else if (maria_concurrent_insert)
    {
      share->concurrent_insert=
	((share->options & (HA_OPTION_READ_ONLY_DATA | HA_OPTION_TMP_TABLE |
			   HA_OPTION_COMPRESS_RECORD |
			   HA_OPTION_TEMP_COMPRESS_RECORD)) ||
	 (open_flags & HA_OPEN_TMP_TABLE) ||
         share->data_file_type == BLOCK_RECORD ||
	 have_rtree) ? 0 : 1;
      if (share->concurrent_insert)
      {
	share->lock.get_status=_ma_get_status;
	share->lock.copy_status=_ma_copy_status;
	share->lock.update_status=_ma_update_status;
	share->lock.restore_status=_ma_restore_status;
	share->lock.check_status=_ma_check_status;
      }
    }
#endif
  }
  else
  {
    share= old_info->s;
    if (mode == O_RDWR && share->mode == O_RDONLY)
    {
      my_errno=EACCES;				/* Can't open in write mode */
      goto err;
    }
    if (share->data_file_type == BLOCK_RECORD)
      info.dfile.file= share->bitmap.file;
    else if (_ma_open_datafile(&info, share, old_info->dfile.file))
      goto err;
    errpos= 5;
    have_rtree= old_info->maria_rtree_recursion_state != NULL;
  }

  /* alloc and set up private structure parts */
  if (!my_multi_malloc(MY_WME,
		       &m_info,sizeof(MARIA_HA),
		       &info.blobs,sizeof(MARIA_BLOB)*share->base.blobs,
		       &info.buff,(share->base.max_key_block_length*2+
				   share->base.max_key_length),
		       &info.lastkey,share->base.max_key_length*3+1,
		       &info.first_mbr_key, share->base.max_key_length,
		       &info.filename,strlen(name)+1,
		       &info.maria_rtree_recursion_state,have_rtree ? 1024 : 0,
		       NullS))
    goto err;
  errpos= 6;

  if (!have_rtree)
    info.maria_rtree_recursion_state= NULL;

  strmov(info.filename,name);
  memcpy(info.blobs,share->blobs,sizeof(MARIA_BLOB)*share->base.blobs);
  info.lastkey2=info.lastkey+share->base.max_key_length;

  info.s=share;
  info.cur_row.lastpos= HA_OFFSET_ERROR;
  info.update= (short) (HA_STATE_NEXT_FOUND+HA_STATE_PREV_FOUND);
  info.opt_flag=READ_CHECK_USED;
  info.this_unique= (ulong) info.dfile.file; /* Uniq number in process */
  if (share->data_file_type == COMPRESSED_RECORD)
    info.this_unique= share->state.unique;
  info.this_loop=0;				/* Update counter */
  info.last_unique= share->state.unique;
  info.last_loop=   share->state.update_count;
  if (mode == O_RDONLY)
    share->options|=HA_OPTION_READ_ONLY_DATA;
  info.lock_type=F_UNLCK;
  info.quick_mode=0;
  info.bulk_insert=0;
  info.ft1_to_ft2=0;
  info.errkey= -1;
  info.page_changed=1;
  info.keyread_buff= info.buff + share->base.max_key_block_length;
  if ((*share->init)(&info))
    goto err;

  pthread_mutex_lock(&share->intern_lock);
  info.read_record= share->read_record;
  share->reopen++;
  share->write_flag=MYF(MY_NABP | MY_WAIT_IF_FULL);
  if (share->options & HA_OPTION_READ_ONLY_DATA)
  {
    info.lock_type=F_RDLCK;
    share->r_locks++;
    share->tot_locks++;
  }
  if ((open_flags & HA_OPEN_TMP_TABLE) ||
      (share->options & HA_OPTION_TMP_TABLE))
  {
    share->temporary= share->delay_key_write= 1;

    share->write_flag=MYF(MY_NABP);
    share->w_locks++;			/* We don't have to update status */
    share->tot_locks++;
    info.lock_type=F_WRLCK;
  }
  if (((open_flags & HA_OPEN_DELAY_KEY_WRITE) ||
      (share->options & HA_OPTION_DELAY_KEY_WRITE)) &&
      maria_delay_key_write)
    share->delay_key_write=1;

  info.state= &share->state.state;	/* Change global values by default */
  pthread_mutex_unlock(&share->intern_lock);

  /* Allocate buffer for one record */
  /* prerequisites: info->rec_buffer == 0 && info->rec_buff_size == 0 */
  if (_ma_alloc_buffer(&info.rec_buff, &info.rec_buff_size,
                       share->base.default_rec_buff_size))
    goto err;

  bzero(info.rec_buff, share->base.default_rec_buff_size);

  *m_info=info;
#ifdef THREAD
  thr_lock_data_init(&share->lock,&m_info->lock,(void*) m_info);
#endif
  m_info->open_list.data=(void*) m_info;
  maria_open_list=list_add(maria_open_list,&m_info->open_list);

  pthread_mutex_unlock(&THR_LOCK_maria);
  DBUG_RETURN(m_info);

err:
  save_errno=my_errno ? my_errno : HA_ERR_END_OF_FILE;
  if ((save_errno == HA_ERR_CRASHED) ||
      (save_errno == HA_ERR_CRASHED_ON_USAGE) ||
      (save_errno == HA_ERR_CRASHED_ON_REPAIR))
    _ma_report_error(save_errno, name);
  switch (errpos) {
  case 6:
    (*share->end)(&info);
    my_free((gptr) m_info,MYF(0));
    /* fall through */
  case 5:
    if (share->data_file_type != BLOCK_RECORD)
      VOID(my_close(info.dfile.file, MYF(0)));
    if (old_info)
      break;					/* Don't remove open table */
    (*share->once_end)(share);    
    /* fall through */
  case 4:
    my_free((gptr) share,MYF(0));
    /* fall through */
  case 3:
    /* fall through */
  case 2:
    my_afree((gptr) disk_cache);
    /* fall through */
  case 1:
    VOID(my_close(kfile,MYF(0)));
    /* fall through */
  case 0:
  default:
    break;
  }
  pthread_mutex_unlock(&THR_LOCK_maria);
  my_errno=save_errno;
  DBUG_RETURN (NULL);
} /* maria_open */


/*
  Reallocate a buffer, if the current buffer is not large enough
*/

my_bool _ma_alloc_buffer(byte **old_addr, my_size_t *old_size,
                         my_size_t new_size)
{
  if (*old_size < new_size)
  {
    byte *addr;
    if (!(addr= (byte*) my_realloc((gptr) *old_addr, new_size,
                                   MYF(MY_ALLOW_ZERO_PTR))))
      return 1;
    *old_addr= addr;
    *old_size= new_size;
  }
  return 0;
}


ulonglong _ma_safe_mul(ulonglong a, ulonglong b)
{
  ulonglong max_val= ~ (ulonglong) 0;		/* my_off_t is unsigned */

  if (!a || max_val / a < b)
    return max_val;
  return a*b;
}

	/* Set up functions in structs */

void _ma_setup_functions(register MARIA_SHARE *share)
{
  share->once_init=          maria_once_init_dummy;
  share->once_end=           maria_once_end_dummy;
  share->init=      	     maria_scan_init_dummy;
  share->end=       	     maria_scan_end_dummy;
  share->scan_init=          maria_scan_init_dummy;/* Compat. dummy function */
  share->scan_end=           maria_scan_end_dummy;/* Compat. dummy function */
  share->write_record_init=  _ma_write_init_default;
  share->write_record_abort= _ma_write_abort_default;

  switch (share->data_file_type) {
  case COMPRESSED_RECORD:
    share->read_record= _ma_read_pack_record;
    share->scan= _ma_read_rnd_pack_record;
    share->once_init= _ma_once_init_pack_row;
    share->once_end=  _ma_once_end_pack_row;
    /*
      Calculate checksum according to data in the original, not compressed,
      row.
    */
    if (share->state.header.org_data_file_type == STATIC_RECORD)
      share->calc_checksum= _ma_static_checksum;
    else
      share->calc_checksum= _ma_checksum;
    share->calc_write_checksum= share->calc_checksum;
    break;
  case DYNAMIC_RECORD:
    share->read_record= _ma_read_dynamic_record;
    share->scan= _ma_read_rnd_dynamic_record;
    share->delete_record= _ma_delete_dynamic_record;
    share->compare_record= _ma_cmp_dynamic_record;
    share->compare_unique= _ma_cmp_dynamic_unique;
    share->calc_checksum= share->calc_write_checksum= _ma_checksum;
    /* add bits used to pack data to pack_reclength for faster allocation */
    share->base.pack_reclength+= share->base.pack_bytes;
    if (share->base.blobs)
    {
      share->update_record= _ma_update_blob_record;
      share->write_record= _ma_write_blob_record;
    }
    else
    {
      share->write_record= _ma_write_dynamic_record;
      share->update_record= _ma_update_dynamic_record;
    }
    break;
  case STATIC_RECORD:
    share->read_record= _ma_read_static_record;
    share->scan= _ma_read_rnd_static_record;
    share->delete_record= _ma_delete_static_record;
    share->compare_record= _ma_cmp_static_record;
    share->update_record= _ma_update_static_record;
    share->write_record= _ma_write_static_record;
    share->compare_unique= _ma_cmp_static_unique;
    share->calc_checksum= share->calc_write_checksum= _ma_static_checksum;
    break;
  case BLOCK_RECORD:
    share->once_init= _ma_once_init_block_record;
    share->once_end=  _ma_once_end_block_record;
    share->init=      _ma_init_block_record;
    share->end=       _ma_end_block_record;
    share->write_record_init= _ma_write_init_block_record;
    share->write_record_abort= _ma_write_abort_block_record;
    share->scan_init=   _ma_scan_init_block_record;
    share->scan_end=    _ma_scan_end_block_record;
    share->read_record= _ma_read_block_record;
    share->scan=        _ma_scan_block_record;
    share->delete_record= _ma_delete_block_record;
    share->compare_record= _ma_compare_block_record;
    share->update_record= _ma_update_block_record;
    share->write_record=  _ma_write_block_record;
    share->compare_unique= _ma_cmp_block_unique;
    share->calc_checksum= _ma_checksum;
    /*
      write_block_record() will calculate the checksum; Tell maria_write()
      that it doesn't have to do this.
    */
    share->calc_write_checksum= 0;
    break;
  }
  share->file_read= _ma_nommap_pread;
  share->file_write= _ma_nommap_pwrite;
  if (!(share->options & HA_OPTION_CHECKSUM) &&
      share->data_file_type != COMPRESSED_RECORD)
    share->calc_checksum= share->calc_write_checksum= 0;
  return;
}


static void setup_key_functions(register MARIA_KEYDEF *keyinfo)
{
  if (keyinfo->key_alg == HA_KEY_ALG_RTREE)
  {
#ifdef HAVE_RTREE_KEYS
    keyinfo->ck_insert = maria_rtree_insert;
    keyinfo->ck_delete = maria_rtree_delete;
#else
    DBUG_ASSERT(0); /* maria_open should check it never happens */
#endif
  }
  else
  {
    keyinfo->ck_insert = _ma_ck_write;
    keyinfo->ck_delete = _ma_ck_delete;
  }
  if (keyinfo->flag & HA_BINARY_PACK_KEY)
  {						/* Simple prefix compression */
    keyinfo->bin_search= _ma_seq_search;
    keyinfo->get_key= _ma_get_binary_pack_key;
    keyinfo->pack_key= _ma_calc_bin_pack_key_length;
    keyinfo->store_key= _ma_store_bin_pack_key;
  }
  else if (keyinfo->flag & HA_VAR_LENGTH_KEY)
  {
    keyinfo->get_key= _ma_get_pack_key;
    if (keyinfo->seg[0].flag & HA_PACK_KEY)
    {						/* Prefix compression */
      if (!keyinfo->seg->charset || use_strnxfrm(keyinfo->seg->charset) ||
          (keyinfo->seg->flag & HA_NULL_PART))
        keyinfo->bin_search= _ma_seq_search;
      else
        keyinfo->bin_search= _ma_prefix_search;
      keyinfo->pack_key= _ma_calc_var_pack_key_length;
      keyinfo->store_key= _ma_store_var_pack_key;
    }
    else
    {
      keyinfo->bin_search= _ma_seq_search;
      keyinfo->pack_key= _ma_calc_var_key_length; /* Variable length key */
      keyinfo->store_key= _ma_store_static_key;
    }
  }
  else
  {
    keyinfo->bin_search= _ma_bin_search;
    keyinfo->get_key= _ma_get_static_key;
    keyinfo->pack_key= _ma_calc_static_key_length;
    keyinfo->store_key= _ma_store_static_key;
  }
  return;
}


/*
   Function to save and store the header in the index file (.MYI)
*/

uint _ma_state_info_write(File file, MARIA_STATE_INFO *state, uint pWrite)
{
  uchar  buff[MARIA_STATE_INFO_SIZE + MARIA_STATE_EXTRA_SIZE];
  uchar *ptr=buff;
  uint	i, keys= (uint) state->header.keys;
  DBUG_ENTER("_ma_state_info_write");

  memcpy_fixed(ptr,&state->header,sizeof(state->header));
  ptr+=sizeof(state->header);

  /* open_count must be first because of _ma_mark_file_changed ! */
  mi_int2store(ptr,state->open_count);			ptr+= 2;
  *ptr++= (uchar)state->changed;
  *ptr++= state->sortkey;
  mi_rowstore(ptr,state->state.records);		ptr+= 8;
  mi_rowstore(ptr,state->state.del);			ptr+= 8;
  mi_rowstore(ptr,state->split);			ptr+= 8;
  mi_sizestore(ptr,state->dellink);			ptr+= 8;
  mi_sizestore(ptr,state->first_bitmap_with_space);	ptr+= 8;
  mi_sizestore(ptr,state->state.key_file_length);	ptr+= 8;
  mi_sizestore(ptr,state->state.data_file_length);	ptr+= 8;
  mi_sizestore(ptr,state->state.empty);			ptr+= 8;
  mi_sizestore(ptr,state->state.key_empty);		ptr+= 8;
  mi_int8store(ptr,state->auto_increment);		ptr+= 8;
  mi_int8store(ptr,(ulonglong) state->state.checksum);	ptr+= 8;
  mi_int4store(ptr,state->process);			ptr+= 4;
  mi_int4store(ptr,state->unique);			ptr+= 4;
  mi_int4store(ptr,state->status);			ptr+= 4;
  mi_int4store(ptr,state->update_count);		ptr+= 4;

  ptr+=	state->state_diff_length;

  for (i=0; i < keys; i++)
  {
    mi_sizestore(ptr,state->key_root[i]);		ptr+= 8;
  }
  mi_sizestore(ptr,state->key_del);	        	ptr+= 8;
  if (pWrite & 2)				/* From maria_chk */
  {
    uint key_parts= mi_uint2korr(state->header.key_parts);
    mi_int4store(ptr,state->sec_index_changed); 	ptr+= 4;
    mi_int4store(ptr,state->sec_index_used);		ptr+= 4;
    mi_int4store(ptr,state->version);			ptr+= 4;
    mi_int8store(ptr,state->key_map);			ptr+= 8;
    mi_int8store(ptr,(ulonglong) state->create_time);	ptr+= 8;
    mi_int8store(ptr,(ulonglong) state->recover_time);	ptr+= 8;
    mi_int8store(ptr,(ulonglong) state->check_time);	ptr+= 8;
    mi_sizestore(ptr,state->rec_per_key_rows);		ptr+= 8;
    for (i=0 ; i < key_parts ; i++)
    {
      mi_int4store(ptr,state->rec_per_key_part[i]);  	ptr+=4;
    }
  }

  if (pWrite & 1)
    DBUG_RETURN(my_pwrite(file,(char*) buff, (uint) (ptr-buff), 0L,
			  MYF(MY_NABP | MY_THREADSAFE)));
  DBUG_RETURN(my_write(file,  (char*) buff, (uint) (ptr-buff),
		       MYF(MY_NABP)));
}


byte *_ma_state_info_read(byte *ptr, MARIA_STATE_INFO *state)
{
  uint i,keys,key_parts;
  memcpy_fixed(&state->header,ptr, sizeof(state->header));
  ptr+= sizeof(state->header);
  keys= (uint) state->header.keys;
  key_parts= mi_uint2korr(state->header.key_parts);

  state->open_count = mi_uint2korr(ptr);		ptr+= 2;
  state->changed= 					(my_bool) *ptr++;
  state->sortkey= 					(uint) *ptr++;
  state->state.records= mi_rowkorr(ptr);		ptr+= 8;
  state->state.del = mi_rowkorr(ptr);			ptr+= 8;
  state->split	= mi_rowkorr(ptr);			ptr+= 8;
  state->dellink= mi_sizekorr(ptr);			ptr+= 8;
  state->first_bitmap_with_space= mi_sizekorr(ptr);	ptr+= 8;
  state->state.key_file_length = mi_sizekorr(ptr);	ptr+= 8;
  state->state.data_file_length= mi_sizekorr(ptr);	ptr+= 8;
  state->state.empty	= mi_sizekorr(ptr);		ptr+= 8;
  state->state.key_empty= mi_sizekorr(ptr);		ptr+= 8;
  state->auto_increment=mi_uint8korr(ptr);		ptr+= 8;
  state->state.checksum=(ha_checksum) mi_uint8korr(ptr);ptr+= 8;
  state->process= mi_uint4korr(ptr);			ptr+= 4;
  state->unique = mi_uint4korr(ptr);			ptr+= 4;
  state->status = mi_uint4korr(ptr);			ptr+= 4;
  state->update_count=mi_uint4korr(ptr);		ptr+= 4;

  ptr+= state->state_diff_length;

  for (i=0; i < keys; i++)
  {
    state->key_root[i]= mi_sizekorr(ptr);		ptr+= 8;
  }
  state->key_del= mi_sizekorr(ptr);			ptr+= 8;
  state->sec_index_changed = mi_uint4korr(ptr); 	ptr+= 4;
  state->sec_index_used =    mi_uint4korr(ptr); 	ptr+= 4;
  state->version     = mi_uint4korr(ptr);		ptr+= 4;
  state->key_map     = mi_uint8korr(ptr);		ptr+= 8;
  state->create_time = (time_t) mi_sizekorr(ptr);	ptr+= 8;
  state->recover_time =(time_t) mi_sizekorr(ptr);	ptr+= 8;
  state->check_time =  (time_t) mi_sizekorr(ptr);	ptr+= 8;
  state->rec_per_key_rows=mi_sizekorr(ptr);		ptr+= 8;
  for (i=0 ; i < key_parts ; i++)
  {
    state->rec_per_key_part[i]= mi_uint4korr(ptr);	ptr+=4;
  }
  return ptr;
}


uint _ma_state_info_read_dsk(File file, MARIA_STATE_INFO *state, my_bool pRead)
{
  char	buff[MARIA_STATE_INFO_SIZE + MARIA_STATE_EXTRA_SIZE];

  if (!maria_single_user)
  {
    if (pRead)
    {
      if (my_pread(file, buff, state->state_length,0L, MYF(MY_NABP)))
	return (MY_FILE_ERROR);
    }
    else if (my_read(file, buff, state->state_length,MYF(MY_NABP)))
      return (MY_FILE_ERROR);
    _ma_state_info_read(buff, state);
  }
  return 0;
}


/****************************************************************************
**  store and read of MARIA_BASE_INFO
****************************************************************************/

uint _ma_base_info_write(File file, MARIA_BASE_INFO *base)
{
  uchar buff[MARIA_BASE_INFO_SIZE], *ptr=buff;

  mi_sizestore(ptr,base->keystart);			ptr+= 8;
  mi_sizestore(ptr,base->max_data_file_length);		ptr+= 8;
  mi_sizestore(ptr,base->max_key_file_length);		ptr+= 8;
  mi_rowstore(ptr,base->records);			ptr+= 8;
  mi_rowstore(ptr,base->reloc);				ptr+= 8;
  mi_int4store(ptr,base->mean_row_length);		ptr+= 4;
  mi_int4store(ptr,base->reclength);			ptr+= 4;
  mi_int4store(ptr,base->pack_reclength);		ptr+= 4;
  mi_int4store(ptr,base->min_pack_length);		ptr+= 4;
  mi_int4store(ptr,base->max_pack_length);		ptr+= 4;
  mi_int4store(ptr,base->min_block_length);		ptr+= 4;
  mi_int2store(ptr,base->fields);			ptr+= 2;
  mi_int2store(ptr,base->fixed_not_null_fields);	ptr+= 2;
  mi_int2store(ptr,base->fixed_not_null_fields_length);	ptr+= 2;
  mi_int2store(ptr,base->max_field_lengths);		ptr+= 2;
  mi_int2store(ptr,base->pack_fields);			ptr+= 2;
  mi_int2store(ptr,0);					ptr+= 2;
  mi_int2store(ptr,base->null_bytes);                   ptr+= 2;
  mi_int2store(ptr,base->original_null_bytes);	        ptr+= 2;
  mi_int2store(ptr,base->field_offsets);	        ptr+= 2;
  mi_int2store(ptr,base->min_row_length);	        ptr+= 2;
  mi_int2store(ptr,base->block_size);	        	ptr+= 2;
  *ptr++= base->rec_reflength;
  *ptr++= base->key_reflength;
  *ptr++= base->keys;
  *ptr++= base->auto_key;
  *ptr++= base->transactional;
  *ptr++= 0;                                    /* Reserved */
  mi_int2store(ptr,base->pack_bytes);			ptr+= 2;
  mi_int2store(ptr,base->blobs);			ptr+= 2;
  mi_int2store(ptr,base->max_key_block_length);		ptr+= 2;
  mi_int2store(ptr,base->max_key_length);		ptr+= 2;
  mi_int2store(ptr,base->extra_alloc_bytes);		ptr+= 2;
  *ptr++= base->extra_alloc_procent;
  bzero(ptr,16);					ptr+= 16; /* extra */
  DBUG_ASSERT((ptr - buff) == MARIA_BASE_INFO_SIZE);
  return my_write(file,(char*) buff, (uint) (ptr-buff), MYF(MY_NABP));
}


static byte *_ma_base_info_read(byte *ptr, MARIA_BASE_INFO *base)
{
  base->keystart= mi_sizekorr(ptr);			ptr+= 8;
  base->max_data_file_length= mi_sizekorr(ptr); 	ptr+= 8;
  base->max_key_file_length= mi_sizekorr(ptr);		ptr+= 8;
  base->records=  (ha_rows) mi_sizekorr(ptr);		ptr+= 8;
  base->reloc= (ha_rows) mi_sizekorr(ptr);		ptr+= 8;
  base->mean_row_length= mi_uint4korr(ptr);		ptr+= 4;
  base->reclength= mi_uint4korr(ptr);			ptr+= 4;
  base->pack_reclength= mi_uint4korr(ptr);		ptr+= 4;
  base->min_pack_length= mi_uint4korr(ptr);		ptr+= 4;
  base->max_pack_length= mi_uint4korr(ptr);		ptr+= 4;
  base->min_block_length= mi_uint4korr(ptr);		ptr+= 4;
  base->fields= mi_uint2korr(ptr);			ptr+= 2;
  base->fixed_not_null_fields= mi_uint2korr(ptr);       ptr+= 2;
  base->fixed_not_null_fields_length= mi_uint2korr(ptr);ptr+= 2;
  base->max_field_lengths= mi_uint2korr(ptr);	        ptr+= 2;
  base->pack_fields= mi_uint2korr(ptr);			ptr+= 2;
  ptr+= 2;
  base->null_bytes= mi_uint2korr(ptr);			ptr+= 2;
  base->original_null_bytes= mi_uint2korr(ptr);		ptr+= 2;
  base->field_offsets= mi_uint2korr(ptr);		ptr+= 2;
  base->min_row_length= mi_uint2korr(ptr);		ptr+= 2;
  base->block_size= mi_uint2korr(ptr);			ptr+= 2;

  base->rec_reflength= *ptr++;
  base->key_reflength= *ptr++;
  base->keys=	       *ptr++;
  base->auto_key=      *ptr++;
  base->transactional= *ptr++;
  ptr++;
  base->pack_bytes= mi_uint2korr(ptr);			ptr+= 2;
  base->blobs= mi_uint2korr(ptr);			ptr+= 2;
  base->max_key_block_length= mi_uint2korr(ptr);	ptr+= 2;
  base->max_key_length= mi_uint2korr(ptr);		ptr+= 2;
  base->extra_alloc_bytes= mi_uint2korr(ptr);		ptr+= 2;
  base->extra_alloc_procent= *ptr++;
  ptr+= 16;
  return ptr;
}

/*--------------------------------------------------------------------------
  maria_keydef
---------------------------------------------------------------------------*/

uint _ma_keydef_write(File file, MARIA_KEYDEF *keydef)
{
  uchar buff[MARIA_KEYDEF_SIZE];
  uchar *ptr=buff;

  *ptr++= (uchar) keydef->keysegs;
  *ptr++= keydef->key_alg;			/* Rtree or Btree */
  mi_int2store(ptr,keydef->flag);		ptr+= 2;
  mi_int2store(ptr,keydef->block_length);	ptr+= 2;
  mi_int2store(ptr,keydef->keylength);		ptr+= 2;
  mi_int2store(ptr,keydef->minlength);		ptr+= 2;
  mi_int2store(ptr,keydef->maxlength);		ptr+= 2;
  return my_write(file,(char*) buff, (uint) (ptr-buff), MYF(MY_NABP));
}

char *_ma_keydef_read(char *ptr, MARIA_KEYDEF *keydef)
{
   keydef->keysegs	= (uint) *ptr++;
   keydef->key_alg	= *ptr++;		/* Rtree or Btree */

   keydef->flag		= mi_uint2korr(ptr);	ptr+= 2;
   keydef->block_length = mi_uint2korr(ptr);	ptr+= 2;
   keydef->keylength	= mi_uint2korr(ptr);	ptr+= 2;
   keydef->minlength	= mi_uint2korr(ptr);	ptr+= 2;
   keydef->maxlength	= mi_uint2korr(ptr);	ptr+= 2;
   keydef->underflow_block_length=keydef->block_length/3;
   keydef->version	= 0;			/* Not saved */
   keydef->parser       = &ft_default_parser;
   keydef->ftparser_nr  = 0;
   return ptr;
}

/***************************************************************************
**  maria_keyseg
***************************************************************************/

int _ma_keyseg_write(File file, const HA_KEYSEG *keyseg)
{
  uchar buff[HA_KEYSEG_SIZE];
  uchar *ptr=buff;
  ulong pos;

  *ptr++= keyseg->type;
  *ptr++= keyseg->language;
  *ptr++= keyseg->null_bit;
  *ptr++= keyseg->bit_start;
  *ptr++= keyseg->bit_end;
  *ptr++= keyseg->bit_length;
  mi_int2store(ptr,keyseg->flag);	ptr+= 2;
  mi_int2store(ptr,keyseg->length);	ptr+= 2;
  mi_int4store(ptr,keyseg->start);	ptr+= 4;
  pos= keyseg->null_bit ? keyseg->null_pos : keyseg->bit_pos;
  mi_int4store(ptr, pos);
  ptr+=4;

  return my_write(file,(char*) buff, (uint) (ptr-buff), MYF(MY_NABP));
}


char *_ma_keyseg_read(char *ptr, HA_KEYSEG *keyseg)
{
   keyseg->type		= *ptr++;
   keyseg->language	= *ptr++;
   keyseg->null_bit	= *ptr++;
   keyseg->bit_start	= *ptr++;
   keyseg->bit_end	= *ptr++;
   keyseg->bit_length   = *ptr++;
   keyseg->flag		= mi_uint2korr(ptr);  ptr+= 2;
   keyseg->length	= mi_uint2korr(ptr);  ptr+= 2;
   keyseg->start	= mi_uint4korr(ptr);  ptr+= 4;
   keyseg->null_pos	= mi_uint4korr(ptr);  ptr+= 4;
   keyseg->charset=0;				/* Will be filled in later */
   if (keyseg->null_bit)
     keyseg->bit_pos= (uint16)(keyseg->null_pos + (keyseg->null_bit == 7));
   else
   {
     keyseg->bit_pos= (uint16)keyseg->null_pos;
     keyseg->null_pos= 0;
   }
   return ptr;
}

/*--------------------------------------------------------------------------
  maria_uniquedef
---------------------------------------------------------------------------*/

uint _ma_uniquedef_write(File file, MARIA_UNIQUEDEF *def)
{
  uchar buff[MARIA_UNIQUEDEF_SIZE];
  uchar *ptr=buff;

  mi_int2store(ptr,def->keysegs);		ptr+=2;
  *ptr++=  (uchar) def->key;
  *ptr++ = (uchar) def->null_are_equal;

  return my_write(file,(char*) buff, (uint) (ptr-buff), MYF(MY_NABP));
}

char *_ma_uniquedef_read(char *ptr, MARIA_UNIQUEDEF *def)
{
   def->keysegs = mi_uint2korr(ptr);
   def->key	= ptr[2];
   def->null_are_equal=ptr[3];
   return ptr+4;				/* 1 extra byte */
}

/***************************************************************************
**  MARIA_COLUMNDEF
***************************************************************************/

uint _ma_columndef_write(File file, MARIA_COLUMNDEF *columndef)
{
  uchar buff[MARIA_COLUMNDEF_SIZE];
  uchar *ptr=buff;

  mi_int6store(ptr,columndef->offset);	        ptr+= 6;
  mi_int2store(ptr,columndef->type);		ptr+= 2;
  mi_int2store(ptr,columndef->length);		ptr+= 2;
  mi_int2store(ptr,columndef->fill_length);	ptr+= 2;
  mi_int2store(ptr,columndef->null_pos);	ptr+= 2;
  mi_int2store(ptr,columndef->empty_pos);	ptr+= 2;
  (*ptr++)= columndef->null_bit;
  (*ptr++)= columndef->empty_bit;
  return my_write(file,(char*) buff, (uint) (ptr-buff), MYF(MY_NABP));
}

char *_ma_columndef_read(char *ptr, MARIA_COLUMNDEF *columndef)
{
  columndef->offset= mi_uint6korr(ptr);         ptr+= 6;
  columndef->type=   mi_sint2korr(ptr);		ptr+= 2;
  columndef->length= mi_uint2korr(ptr);		ptr+= 2;
  columndef->fill_length= mi_uint2korr(ptr);	ptr+= 2;
  columndef->null_pos= mi_uint2korr(ptr);	ptr+= 2;
  columndef->empty_pos= mi_uint2korr(ptr);	ptr+= 2;
  columndef->null_bit=  (uint8) *ptr++;
  columndef->empty_bit= (uint8) *ptr++;
  return ptr;
}

/**************************************************************************
 Open data file
  We can't use dup() here as the data file descriptors need to have different
  active seek-positions.

  The argument file_to_dup is here for the future if there would on some OS
  exist a dup()-like call that would give us two different file descriptors.
*************************************************************************/

int _ma_open_datafile(MARIA_HA *info, MARIA_SHARE *share,
                      File file_to_dup __attribute__((unused)))
{
  info->dfile.file= my_open(share->data_file_name, share->mode | O_SHARE,
                            MYF(MY_WME));
  return info->dfile.file >= 0 ? 0 : 1;
}


int _ma_open_keyfile(MARIA_SHARE *share)
{
  if ((share->kfile.file= my_open(share->unique_file_name,
                                  share->mode | O_SHARE,
			    MYF(MY_WME))) < 0)
    return 1;
  return 0;
}


/*
  Disable all indexes.

  SYNOPSIS
    maria_disable_indexes()
    info        A pointer to the MARIA storage engine MARIA_HA struct.

  DESCRIPTION
    Disable all indexes.

  RETURN
    0  ok
*/

int maria_disable_indexes(MARIA_HA *info)
{
  MARIA_SHARE *share= info->s;

  maria_clear_all_keys_active(share->state.key_map);
  return 0;
}


/*
  Enable all indexes

  SYNOPSIS
    maria_enable_indexes()
    info        A pointer to the MARIA storage engine MARIA_HA struct.

  DESCRIPTION
    Enable all indexes. The indexes might have been disabled
    by maria_disable_index() before.
    The function works only if both data and indexes are empty,
    otherwise a repair is required.
    To be sure, call handler::delete_all_rows() before.

  RETURN
    0  ok
    HA_ERR_CRASHED data or index is non-empty.
*/

int maria_enable_indexes(MARIA_HA *info)
{
  int error= 0;
  MARIA_SHARE *share= info->s;

  if (share->state.state.data_file_length ||
      (share->state.state.key_file_length != share->base.keystart))
  {
    maria_print_error(info->s, HA_ERR_CRASHED);
    error= HA_ERR_CRASHED;
  }
  else
    maria_set_all_keys_active(share->state.key_map, share->base.keys);
  return error;
}


/*
  Test if indexes are disabled.

  SYNOPSIS
    maria_indexes_are_disabled()
    info        A pointer to the MARIA storage engine MARIA_HA struct.

  DESCRIPTION
    Test if indexes are disabled.

  RETURN
    0  indexes are not disabled
    1  all indexes are disabled
    2  non-unique indexes are disabled
*/

int maria_indexes_are_disabled(MARIA_HA *info)
{
  MARIA_SHARE *share= info->s;

  /*
    No keys or all are enabled. keys is the number of keys. Left shifted
    gives us only one bit set. When decreased by one, gives us all all bits
    up to this one set and it gets unset.
  */
  if (!share->base.keys ||
      (maria_is_all_keys_active(share->state.key_map, share->base.keys)))
    return 0;

  /* All are disabled */
  if (maria_is_any_key_active(share->state.key_map))
    return 1;

  /*
    We have keys. Some enabled, some disabled.
    Don't check for any non-unique disabled but return directly 2
  */
  return 2;
}


static my_bool maria_scan_init_dummy(MARIA_HA *info __attribute__((unused)))
{
  return 0;
}

static void maria_scan_end_dummy(MARIA_HA *info __attribute__((unused)))
{
}

static my_bool maria_once_init_dummy(MARIA_SHARE *share
                                     __attribute__((unused)),
                                     File dfile __attribute__((unused)))
{
  return 0;
}

static my_bool maria_once_end_dummy(MARIA_SHARE *share __attribute__((unused)))
{
  return 0;
}