ha_tina.cc 41.2 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513
/* Copyright (C) 2003 MySQL 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 */

/*
  Make sure to look at ha_tina.h for more details.

  First off, this is a play thing for me, there are a number of things
  wrong with it:
    *) It was designed for csv and therefore its performance is highly
       questionable.
    *) Indexes have not been implemented. This is because the files can
       be traded in and out of the table directory without having to worry
       about rebuilding anything.
    *) NULLs and "" are treated equally (like a spreadsheet).
    *) There was in the beginning no point to anyone seeing this other
       then me, so there is a good chance that I haven't quite documented
       it well.
    *) Less design, more "make it work"

  Now there are a few cool things with it:
    *) Errors can result in corrupted data files.
    *) Data files can be read by spreadsheets directly.

TODO:
 *) Move to a block system for larger files
 *) Error recovery, its all there, just need to finish it
 *) Document how the chains work.

 -Brian
*/

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

#include "mysql_priv.h"

#include "ha_tina.h"

#include <mysql/plugin.h>

/*
  uchar + uchar + ulonglong + ulonglong + ulonglong + ulonglong + uchar
*/
#define META_BUFFER_SIZE sizeof(uchar) + sizeof(uchar) + sizeof(ulonglong) \
  + sizeof(ulonglong) + sizeof(ulonglong) + sizeof(ulonglong) + sizeof(uchar)
#define TINA_CHECK_HEADER 254 // The number we use to determine corruption

/* The file extension */
#define CSV_EXT ".CSV"               // The data file
#define CSN_EXT ".CSN"               // Files used during repair and update
#define CSM_EXT ".CSM"               // Meta file


static TINA_SHARE *get_share(const char *table_name, TABLE *table);
static int free_share(TINA_SHARE *share);
static int read_meta_file(File meta_file, ha_rows *rows);
static int write_meta_file(File meta_file, ha_rows rows, bool dirty);

/* Stuff for shares */
pthread_mutex_t tina_mutex;
static HASH tina_open_tables;
static handler *tina_create_handler(handlerton *hton,
                                    TABLE_SHARE *table, 
                                    MEM_ROOT *mem_root);


/*****************************************************************************
 ** TINA tables
 *****************************************************************************/

/*
  Used for sorting chains with qsort().
*/
int sort_set (tina_set *a, tina_set *b)
{
  /*
    We assume that intervals do not intersect. So, it is enought to compare
    any two points. Here we take start of intervals for comparison.
  */
  return ( a->begin > b->begin ? 1 : ( a->begin < b->begin ? -1 : 0 ) );
}

static uchar* tina_get_key(TINA_SHARE *share, size_t *length,
                          my_bool not_used __attribute__((unused)))
{
  *length=share->table_name_length;
  return (uchar*) share->table_name;
}

static int tina_init_func(void *p)
{
  handlerton *tina_hton;

  tina_hton= (handlerton *)p;
  VOID(pthread_mutex_init(&tina_mutex,MY_MUTEX_INIT_FAST));
  (void) hash_init(&tina_open_tables,system_charset_info,32,0,0,
                   (hash_get_key) tina_get_key,0,0);
  tina_hton->state= SHOW_OPTION_YES;
  tina_hton->db_type= DB_TYPE_CSV_DB;
  tina_hton->create= tina_create_handler;
  tina_hton->flags= (HTON_CAN_RECREATE | HTON_SUPPORT_LOG_TABLES | 
                     HTON_NO_PARTITION);
  return 0;
}

static int tina_done_func(void *p)
{
  hash_free(&tina_open_tables);
  pthread_mutex_destroy(&tina_mutex);

  return 0;
}


/*
  Simple lock controls.
*/
static TINA_SHARE *get_share(const char *table_name, TABLE *table)
{
  TINA_SHARE *share;
  char meta_file_name[FN_REFLEN];
  MY_STAT file_stat;                /* Stat information for the data file */
  char *tmp_name;
  uint length;

  pthread_mutex_lock(&tina_mutex);
  length=(uint) strlen(table_name);

  /*
    If share is not present in the hash, create a new share and
    initialize its members.
  */
  if (!(share=(TINA_SHARE*) hash_search(&tina_open_tables,
                                        (uchar*) table_name,
                                       length)))
  {
    if (!my_multi_malloc(MYF(MY_WME | MY_ZEROFILL),
                         &share, sizeof(*share),
                         &tmp_name, length+1,
                         NullS))
    {
      pthread_mutex_unlock(&tina_mutex);
      return NULL;
    }

    share->use_count= 0;
    share->is_log_table= FALSE;
    share->table_name_length= length;
    share->table_name= tmp_name;
    share->crashed= FALSE;
    share->rows_recorded= 0;
    share->update_file_opened= FALSE;
    share->tina_write_opened= FALSE;
    strmov(share->table_name, table_name);
    fn_format(share->data_file_name, table_name, "", CSV_EXT,
              MY_REPLACE_EXT|MY_UNPACK_FILENAME);
    fn_format(meta_file_name, table_name, "", CSM_EXT,
              MY_REPLACE_EXT|MY_UNPACK_FILENAME);

    if (my_stat(share->data_file_name, &file_stat, MYF(MY_WME)) == NULL)
      goto error;
    share->saved_data_file_length= file_stat.st_size;

    if (my_hash_insert(&tina_open_tables, (uchar*) share))
      goto error;
    thr_lock_init(&share->lock);
    pthread_mutex_init(&share->mutex,MY_MUTEX_INIT_FAST);

    /*
      Open or create the meta file. In the latter case, we'll get
      an error during read_meta_file and mark the table as crashed.
      Usually this will result in auto-repair, and we will get a good
      meta-file in the end.
    */
    if ((share->meta_file= my_open(meta_file_name,
                                   O_RDWR|O_CREAT, MYF(0))) == -1)
      share->crashed= TRUE;

    /*
      If the meta file will not open we assume it is crashed and
      mark it as such.
    */
    if (read_meta_file(share->meta_file, &share->rows_recorded))
      share->crashed= TRUE;
  }
  share->use_count++;
  pthread_mutex_unlock(&tina_mutex);

  return share;

error:
  pthread_mutex_unlock(&tina_mutex);
  my_free((uchar*) share, MYF(0));

  return NULL;
}


/*
  Read CSV meta-file

  SYNOPSIS
    read_meta_file()
    meta_file   The meta-file filedes
    ha_rows     Pointer to the var we use to store rows count.
                These are read from the meta-file.

  DESCRIPTION

    Read the meta-file info. For now we are only interested in
    rows counf, crashed bit and magic number.

  RETURN
    0 - OK
    non-zero - error occurred
*/

static int read_meta_file(File meta_file, ha_rows *rows)
{
  uchar meta_buffer[META_BUFFER_SIZE];
  uchar *ptr= meta_buffer;

  DBUG_ENTER("ha_tina::read_meta_file");

  VOID(my_seek(meta_file, 0, MY_SEEK_SET, MYF(0)));
  if (my_read(meta_file, (uchar*)meta_buffer, META_BUFFER_SIZE, 0)
      != META_BUFFER_SIZE)
    DBUG_RETURN(HA_ERR_CRASHED_ON_USAGE);

  /*
    Parse out the meta data, we ignore version at the moment
  */

  ptr+= sizeof(uchar)*2; // Move past header
  *rows= (ha_rows)uint8korr(ptr);
  ptr+= sizeof(ulonglong); // Move past rows
  /*
    Move past check_point, auto_increment and forced_flushes fields.
    They are present in the format, but we do not use them yet.
  */
  ptr+= 3*sizeof(ulonglong);

  /* check crashed bit and magic number */
  if ((meta_buffer[0] != (uchar)TINA_CHECK_HEADER) ||
      ((bool)(*ptr)== TRUE))
    DBUG_RETURN(HA_ERR_CRASHED_ON_USAGE);

  my_sync(meta_file, MYF(MY_WME));

  DBUG_RETURN(0);
}


/*
  Write CSV meta-file

  SYNOPSIS
    write_meta_file()
    meta_file   The meta-file filedes
    ha_rows     The number of rows we have in the datafile.
    dirty       A flag, which marks whether we have a corrupt table

  DESCRIPTION

    Write meta-info the the file. Only rows count, crashed bit and
    magic number matter now.

  RETURN
    0 - OK
    non-zero - error occurred
*/

static int write_meta_file(File meta_file, ha_rows rows, bool dirty)
{
  uchar meta_buffer[META_BUFFER_SIZE];
  uchar *ptr= meta_buffer;

  DBUG_ENTER("ha_tina::write_meta_file");

  *ptr= (uchar)TINA_CHECK_HEADER;
  ptr+= sizeof(uchar);
  *ptr= (uchar)TINA_VERSION;
  ptr+= sizeof(uchar);
  int8store(ptr, (ulonglong)rows);
  ptr+= sizeof(ulonglong);
  memset(ptr, 0, 3*sizeof(ulonglong));
  /*
     Skip over checkpoint, autoincrement and forced_flushes fields.
     We'll need them later.
  */
  ptr+= 3*sizeof(ulonglong);
  *ptr= (uchar)dirty;

  VOID(my_seek(meta_file, 0, MY_SEEK_SET, MYF(0)));
  if (my_write(meta_file, (uchar *)meta_buffer, META_BUFFER_SIZE, 0)
      != META_BUFFER_SIZE)
    DBUG_RETURN(-1);

  my_sync(meta_file, MYF(MY_WME));

  DBUG_RETURN(0);
}

bool ha_tina::check_and_repair(THD *thd)
{
  HA_CHECK_OPT check_opt;
  DBUG_ENTER("ha_tina::check_and_repair");

  check_opt.init();

  DBUG_RETURN(repair(thd, &check_opt));
}


int ha_tina::init_tina_writer()
{
  DBUG_ENTER("ha_tina::init_tina_writer");

  /*
    Mark the file as crashed. We will set the flag back when we close
    the file. In the case of the crash it will remain marked crashed,
    which enforce recovery.
  */
  (void)write_meta_file(share->meta_file, share->rows_recorded, TRUE);

  if ((share->tina_write_filedes=
        my_open(share->data_file_name, O_RDWR|O_APPEND, MYF(0))) == -1)
  {
    DBUG_PRINT("info", ("Could not open tina file writes"));
    share->crashed= TRUE;
    DBUG_RETURN(1);
  }
  share->tina_write_opened= TRUE;

  DBUG_RETURN(0);
}


bool ha_tina::is_crashed() const
{
  DBUG_ENTER("ha_tina::is_crashed");
  DBUG_RETURN(share->crashed);
}

/*
  Free lock controls.
*/
static int free_share(TINA_SHARE *share)
{
  DBUG_ENTER("ha_tina::free_share");
  pthread_mutex_lock(&tina_mutex);
  int result_code= 0;
  if (!--share->use_count){
    /* Write the meta file. Mark it as crashed if needed. */
    (void)write_meta_file(share->meta_file, share->rows_recorded,
                          share->crashed ? TRUE :FALSE);
    if (my_close(share->meta_file, MYF(0)))
      result_code= 1;
    if (share->tina_write_opened)
    {
      if (my_close(share->tina_write_filedes, MYF(0)))
        result_code= 1;
      share->tina_write_opened= FALSE;
    }

    hash_delete(&tina_open_tables, (uchar*) share);
    thr_lock_delete(&share->lock);
    pthread_mutex_destroy(&share->mutex);
    my_free((uchar*) share, MYF(0));
  }
  pthread_mutex_unlock(&tina_mutex);

  DBUG_RETURN(result_code);
}


/*
  This function finds the end of a line and returns the length
  of the line ending.

  We support three kinds of line endings:
  '\r'     --  Old Mac OS line ending
  '\n'     --  Traditional Unix and Mac OS X line ending
  '\r''\n' --  DOS\Windows line ending
*/

off_t find_eoln_buff(Transparent_file *data_buff, off_t begin,
                     off_t end, int *eoln_len)
{
  *eoln_len= 0;

  for (off_t x= begin; x < end; x++)
  {
    /* Unix (includes Mac OS X) */
    if (data_buff->get_value(x) == '\n')
      *eoln_len= 1;
    else
      if (data_buff->get_value(x) == '\r') // Mac or Dos
      {
        /* old Mac line ending */
        if (x + 1 == end || (data_buff->get_value(x + 1) != '\n'))
          *eoln_len= 1;
        else // DOS style ending
          *eoln_len= 2;
      }

    if (*eoln_len)  // end of line was found
      return x;
  }

  return 0;
}


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


ha_tina::ha_tina(handlerton *hton, TABLE_SHARE *table_arg)
  :handler(hton, table_arg),
  /*
    These definitions are found in handler.h
    They are not probably completely right.
  */
  current_position(0), next_position(0), local_saved_data_file_length(0),
  file_buff(0), chain_alloced(0), chain_size(DEFAULT_CHAIN_LENGTH),
  records_is_known(0)
{
  /* Set our original buffers from pre-allocated memory */
  buffer.set((char*)byte_buffer, IO_SIZE, &my_charset_bin);
  chain= chain_buffer;
  file_buff= new Transparent_file();
}


/*
  Encode a buffer into the quoted format.
*/

int ha_tina::encode_quote(uchar *buf)
{
  char attribute_buffer[1024];
  String attribute(attribute_buffer, sizeof(attribute_buffer),
                   &my_charset_bin);

  my_bitmap_map *org_bitmap= dbug_tmp_use_all_columns(table, table->read_set);
  buffer.length(0);

  for (Field **field=table->field ; *field ; field++)
  {
    const char *ptr;
    const char *end_ptr;

    /*
      CSV does not support nulls. Write quoted 0 to the buffer. In fact,
      (*field)->val_str(&attribute,&attribute) would usually return 0
      in this case but we write it explicitly here.
      Basically this is a safety check, as no one ensures that the
      field content is cleaned up every time we use Field::set_null()
      in the code.
    */
    if ((*field)->is_null())
    {
      buffer.append(STRING_WITH_LEN("\"0\","));
      continue;
    }

    (*field)->val_str(&attribute,&attribute);

    if ((*field)->str_needs_quotes())
    {
      ptr= attribute.ptr();
      end_ptr= attribute.length() + ptr;

      buffer.append('"');

      while (ptr < end_ptr) 
      {
        if (*ptr == '"')
        {
          buffer.append('\\');
          buffer.append('"');
          *ptr++;
        }
        else if (*ptr == '\r')
        {
          buffer.append('\\');
          buffer.append('r');
          *ptr++;
        }
        else if (*ptr == '\\')
        {
          buffer.append('\\');
          buffer.append('\\');
          *ptr++;
        }
        else if (*ptr == '\n')
        {
          buffer.append('\\');
          buffer.append('n');
          *ptr++;
        }
        else
          buffer.append(*ptr++);
      }
      buffer.append('"');
    }
    else
    {
      buffer.append(attribute);
    }

    buffer.append(',');
  }
  // Remove the comma, add a line feed
  buffer.length(buffer.length() - 1);
  buffer.append('\n');

  //buffer.replace(buffer.length(), 0, "\n", 1);

  dbug_tmp_restore_column_map(table->read_set, org_bitmap);
  return (buffer.length());
}

/*
  chain_append() adds delete positions to the chain that we use to keep
  track of space. Then the chain will be used to cleanup "holes", occurred
  due to deletes and updates.
*/
int ha_tina::chain_append()
{
  if ( chain_ptr != chain && (chain_ptr -1)->end == current_position)
    (chain_ptr -1)->end= next_position;
  else
  {
    /* We set up for the next position */
    if ((off_t)(chain_ptr - chain) == (chain_size -1))
    {
      off_t location= chain_ptr - chain;
      chain_size += DEFAULT_CHAIN_LENGTH;
      if (chain_alloced)
      {
        /* Must cast since my_malloc unlike malloc doesn't have a void ptr */
        if ((chain= (tina_set *) my_realloc((uchar*)chain,
                                            chain_size, MYF(MY_WME))) == NULL)
          return -1;
      }
      else
      {
        tina_set *ptr= (tina_set *) my_malloc(chain_size * sizeof(tina_set),
                                              MYF(MY_WME));
        memcpy(ptr, chain, DEFAULT_CHAIN_LENGTH * sizeof(tina_set));
        chain= ptr;
        chain_alloced++;
      }
      chain_ptr= chain + location;
    }
    chain_ptr->begin= current_position;
    chain_ptr->end= next_position;
    chain_ptr++;
  }

  return 0;
}


/*
  Scans for a row.
*/
int ha_tina::find_current_row(uchar *buf)
{
  off_t end_offset, curr_offset= current_position;
  int eoln_len;
  my_bitmap_map *org_bitmap;
  int error;
  bool read_all;
  DBUG_ENTER("ha_tina::find_current_row");

  /*
    We do not read further then local_saved_data_file_length in order
    not to conflict with undergoing concurrent insert.
  */
  if ((end_offset=
        find_eoln_buff(file_buff, current_position,
                       local_saved_data_file_length, &eoln_len)) == 0)
    DBUG_RETURN(HA_ERR_END_OF_FILE);

  /* We must read all columns in case a table is opened for update */
  read_all= !bitmap_is_clear_all(table->write_set);
  /* Avoid asserts in ::store() for columns that are not going to be updated */
  org_bitmap= dbug_tmp_use_all_columns(table, table->write_set);
  error= HA_ERR_CRASHED_ON_USAGE;

  memset(buf, 0, table->s->null_bytes);

  for (Field **field=table->field ; *field ; field++)
  {
    buffer.length(0);
    if (curr_offset < end_offset &&
        file_buff->get_value(curr_offset) == '"')
    {
      curr_offset++; // Incrementpast the first quote

      for(;curr_offset < end_offset; curr_offset++)
      {
        // Need to convert line feeds!
        if (file_buff->get_value(curr_offset) == '"' &&
            ((file_buff->get_value(curr_offset + 1) == ',') ||
             (curr_offset == end_offset -1 )))
        {
          curr_offset+= 2; // Move past the , and the "
          break;
        }
        if (file_buff->get_value(curr_offset) == '\\' &&
            curr_offset != (end_offset - 1))
        {
          curr_offset++;
          if (file_buff->get_value(curr_offset) == 'r')
            buffer.append('\r');
          else if (file_buff->get_value(curr_offset) == 'n' )
            buffer.append('\n');
          else if ((file_buff->get_value(curr_offset) == '\\') ||
                   (file_buff->get_value(curr_offset) == '"'))
            buffer.append(file_buff->get_value(curr_offset));
          else  /* This could only happed with an externally created file */
          {
            buffer.append('\\');
            buffer.append(file_buff->get_value(curr_offset));
          }
        }
        else // ordinary symbol
        {
          /*
            We are at final symbol and no last quote was found =>
            we are working with a damaged file.
          */
          if (curr_offset == end_offset - 1)
            goto err;
          buffer.append(file_buff->get_value(curr_offset));
        }
      }
    }
    else if (my_isdigit(system_charset_info, 
                        file_buff->get_value(curr_offset))) 
    {
      for(;curr_offset < end_offset; curr_offset++)
      {
        if (file_buff->get_value(curr_offset) == ',')
        {
          curr_offset+= 1; // Move past the ,
          break;
        }

        if (my_isdigit(system_charset_info, file_buff->get_value(curr_offset))) 
          buffer.append(file_buff->get_value(curr_offset));
        else if (file_buff->get_value(curr_offset) == '.')
          buffer.append(file_buff->get_value(curr_offset));
        else
          goto err;
      }
    }
    else
    {
      goto err;
    }

    if (read_all || bitmap_is_set(table->read_set, (*field)->field_index))
      (*field)->store(buffer.ptr(), buffer.length(), buffer.charset());
  }
  next_position= end_offset + eoln_len;
  error= 0;

err:
  dbug_tmp_restore_column_map(table->write_set, org_bitmap);

  DBUG_RETURN(error);
}

/*
  If frm_error() is called in table.cc this is called to find out what file
  extensions exist for this handler.
*/
static const char *ha_tina_exts[] = {
  CSV_EXT,
  CSM_EXT,
  NullS
};

const char **ha_tina::bas_ext() const
{
  return ha_tina_exts;
}

/*
  Three functions below are needed to enable concurrent insert functionality
  for CSV engine. For more details see mysys/thr_lock.c
*/

void tina_get_status(void* param, int concurrent_insert)
{
  ha_tina *tina= (ha_tina*) param;
  tina->get_status();
}

void tina_update_status(void* param)
{
  ha_tina *tina= (ha_tina*) param;
  tina->update_status();
}

/* this should exist and return 0 for concurrent insert to work */
my_bool tina_check_status(void* param)
{
  return 0;
}

/*
  Save the state of the table

  SYNOPSIS
    get_status()

  DESCRIPTION
    This function is used to retrieve the file length. During the lock
    phase of concurrent insert. For more details see comment to
    ha_tina::update_status below.
*/

void ha_tina::get_status()
{
  if (share->is_log_table)
  {
    /*
      We have to use mutex to follow pthreads memory visibility
      rules for share->saved_data_file_length
    */
    pthread_mutex_lock(&share->mutex);
    local_saved_data_file_length= share->saved_data_file_length;
    pthread_mutex_unlock(&share->mutex);
    return;
  }
  local_saved_data_file_length= share->saved_data_file_length;
}


/*
  Correct the state of the table. Called by unlock routines
  before the write lock is released.

  SYNOPSIS
    update_status()

  DESCRIPTION
    When we employ concurrent insert lock, we save current length of the file
    during the lock phase. We do not read further saved value, as we don't
    want to interfere with undergoing concurrent insert. Writers update file
    length info during unlock with update_status().

  NOTE
    For log tables concurrent insert works different. The reason is that
    log tables are always opened and locked. And as they do not unlock
    tables, the file length after writes should be updated in a different
    way. For this purpose we need is_log_table flag. When this flag is set
    we call update_status() explicitly after each row write.
*/

void ha_tina::update_status()
{
  /* correct local_saved_data_file_length for writers */
  share->saved_data_file_length= local_saved_data_file_length;
}


bool ha_tina::check_if_locking_is_allowed(uint sql_command,
                                          ulong type, TABLE *table,
                                          uint count, uint current,
                                          uint *system_count,
                                          bool called_by_privileged_thread)
{
  if (!called_by_privileged_thread)
    return check_if_log_table_locking_is_allowed(sql_command, type, table);

  return TRUE;
}

/*
  Open a database file. Keep in mind that tables are caches, so
  this will not be called for every request. Any sort of positions
  that need to be reset should be kept in the ::extra() call.
*/
int ha_tina::open(const char *name, int mode, uint open_options)
{
  DBUG_ENTER("ha_tina::open");

  if (!(share= get_share(name, table)))
    DBUG_RETURN(HA_ERR_OUT_OF_MEM);

  if (share->crashed && !(open_options & HA_OPEN_FOR_REPAIR))
  {
    free_share(share);
    DBUG_RETURN(HA_ERR_CRASHED_ON_USAGE);
  }

  if ((data_file= my_open(share->data_file_name, O_RDONLY, MYF(0))) == -1)
    DBUG_RETURN(0);

  /*
    Init locking. Pass handler object to the locking routines,
    so that they could save/update local_saved_data_file_length value
    during locking. This is needed to enable concurrent inserts.
  */
  thr_lock_data_init(&share->lock, &lock, (void*) this);
  ref_length=sizeof(off_t);

  share->lock.get_status= tina_get_status;
  share->lock.update_status= tina_update_status;
  share->lock.check_status= tina_check_status;

  DBUG_RETURN(0);
}


/*
  Close a database file. We remove ourselves from the shared strucutre.
  If it is empty we destroy it.
*/
int ha_tina::close(void)
{
  int rc= 0;
  DBUG_ENTER("ha_tina::close");
  rc= my_close(data_file, MYF(0));
  DBUG_RETURN(free_share(share) || rc);
}

/*
  This is an INSERT. At the moment this handler just seeks to the end
  of the file and appends the data. In an error case it really should
  just truncate to the original position (this is not done yet).
*/
int ha_tina::write_row(uchar * buf)
{
  int size;
  DBUG_ENTER("ha_tina::write_row");

  if (share->crashed)
      DBUG_RETURN(HA_ERR_CRASHED_ON_USAGE);

  ha_statistic_increment(&SSV::ha_write_count);

  if (table->timestamp_field_type & TIMESTAMP_AUTO_SET_ON_INSERT)
    table->timestamp_field->set_time();

  size= encode_quote(buf);

  if (!share->tina_write_opened)
    if (init_tina_writer())
      DBUG_RETURN(-1);

   /* use pwrite, as concurrent reader could have changed the position */
  if (my_write(share->tina_write_filedes, (uchar*)buffer.ptr(), size,
               MYF(MY_WME | MY_NABP)))
    DBUG_RETURN(-1);

  /* update local copy of the max position to see our own changes */
  local_saved_data_file_length+= size;

  /* update shared info */
  pthread_mutex_lock(&share->mutex);
  share->rows_recorded++;
  /* update status for the log tables */
  if (share->is_log_table)
    update_status();
  pthread_mutex_unlock(&share->mutex);

  stats.records++;
  DBUG_RETURN(0);
}


int ha_tina::open_update_temp_file_if_needed()
{
  char updated_fname[FN_REFLEN];

  if (!share->update_file_opened)
  {
    if ((update_temp_file=
           my_create(fn_format(updated_fname, share->table_name,
                               "", CSN_EXT,
                               MY_REPLACE_EXT | MY_UNPACK_FILENAME),
                     0, O_RDWR | O_TRUNC, MYF(MY_WME))) < 0)
      return 1;
    share->update_file_opened= TRUE;
  }
  return 0;
}

/*
  This is called for an update.
  Make sure you put in code to increment the auto increment, also
  update any timestamp data. Currently auto increment is not being
  fixed since autoincrements have yet to be added to this table handler.
  This will be called in a table scan right before the previous ::rnd_next()
  call.
*/
int ha_tina::update_row(const uchar * old_data, uchar * new_data)
{
  int size;
  DBUG_ENTER("ha_tina::update_row");

  ha_statistic_increment(&SSV::ha_read_rnd_next_count);

  if (table->timestamp_field_type & TIMESTAMP_AUTO_SET_ON_UPDATE)
    table->timestamp_field->set_time();

  size= encode_quote(new_data);

  if (chain_append())
    DBUG_RETURN(-1);

  if (open_update_temp_file_if_needed())
    DBUG_RETURN(-1);

  if (my_write(update_temp_file, (uchar*)buffer.ptr(), size,
               MYF(MY_WME | MY_NABP)))
    DBUG_RETURN(-1);

  /* UPDATE should never happen on the log tables */
  DBUG_ASSERT(!share->is_log_table);

  DBUG_RETURN(0);
}


/*
  Deletes a row. First the database will find the row, and then call this
  method. In the case of a table scan, the previous call to this will be
  the ::rnd_next() that found this row.
  The exception to this is an ORDER BY. This will cause the table handler
  to walk the table noting the positions of all rows that match a query.
  The table will then be deleted/positioned based on the ORDER (so RANDOM,
  DESC, ASC).
*/
int ha_tina::delete_row(const uchar * buf)
{
  DBUG_ENTER("ha_tina::delete_row");
  ha_statistic_increment(&SSV::ha_delete_count);

  if (chain_append())
    DBUG_RETURN(-1);

  stats.records--;

  /* DELETE should never happen on the log table */
  DBUG_ASSERT(!share->is_log_table);

  DBUG_RETURN(0);
}


/*
  All table scans call this first.
  The order of a table scan is:

  ha_tina::store_lock
  ha_tina::external_lock
  ha_tina::info
  ha_tina::rnd_init
  ha_tina::extra
  ENUM HA_EXTRA_CACHE   Cash record in HA_rrnd()
  ha_tina::rnd_next
  ha_tina::rnd_next
  ha_tina::rnd_next
  ha_tina::rnd_next
  ha_tina::rnd_next
  ha_tina::rnd_next
  ha_tina::rnd_next
  ha_tina::rnd_next
  ha_tina::rnd_next
  ha_tina::extra
  ENUM HA_EXTRA_NO_CACHE   End cacheing of records (def)
  ha_tina::external_lock
  ha_tina::extra
  ENUM HA_EXTRA_RESET   Reset database to after open

  Each call to ::rnd_next() represents a row returned in the can. When no more
  rows can be returned, rnd_next() returns a value of HA_ERR_END_OF_FILE.
  The ::info() call is just for the optimizer.

*/

int ha_tina::rnd_init(bool scan)
{
  DBUG_ENTER("ha_tina::rnd_init");

  /* set buffer to the beginning of the file */
  file_buff->init_buff(data_file);
  if (share->crashed)
      DBUG_RETURN(HA_ERR_CRASHED_ON_USAGE);

  current_position= next_position= 0;
  stats.records= 0;
  records_is_known= 0;
  chain_ptr= chain;

  DBUG_RETURN(0);
}

/*
  ::rnd_next() does all the heavy lifting for a table scan. You will need to
  populate *buf with the correct field data. You can walk the field to
  determine at what position you should store the data (take a look at how
  ::find_current_row() works). The structure is something like:
  0Foo  Dog  Friend
  The first offset is for the first attribute. All space before that is
  reserved for null count.
  Basically this works as a mask for which rows are nulled (compared to just
  empty).
  This table handler doesn't do nulls and does not know the difference between
  NULL and "". This is ok since this table handler is for spreadsheets and
  they don't know about them either :)
*/
int ha_tina::rnd_next(uchar *buf)
{
  int rc;
  DBUG_ENTER("ha_tina::rnd_next");

  if (share->crashed)
      DBUG_RETURN(HA_ERR_CRASHED_ON_USAGE);

  ha_statistic_increment(&SSV::ha_read_rnd_next_count);

  current_position= next_position;

  /* don't scan an empty file */
  if (!local_saved_data_file_length)
    DBUG_RETURN(HA_ERR_END_OF_FILE);

  if ((rc= find_current_row(buf)))
    DBUG_RETURN(rc);

  stats.records++;
  DBUG_RETURN(0);
}

/*
  In the case of an order by rows will need to be sorted.
  ::position() is called after each call to ::rnd_next(),
  the data it stores is to a byte array. You can store this
  data via my_store_ptr(). ref_length is a variable defined to the
  class that is the sizeof() of position being stored. In our case
  its just a position. Look at the bdb code if you want to see a case
  where something other then a number is stored.
*/
void ha_tina::position(const uchar *record)
{
  DBUG_ENTER("ha_tina::position");
  my_store_ptr(ref, ref_length, current_position);
  DBUG_VOID_RETURN;
}


/*
  Used to fetch a row from a posiion stored with ::position().
  my_get_ptr() retrieves the data for you.
*/

int ha_tina::rnd_pos(uchar * buf, uchar *pos)
{
  DBUG_ENTER("ha_tina::rnd_pos");
  ha_statistic_increment(&SSV::ha_read_rnd_next_count);
  current_position= (off_t)my_get_ptr(pos,ref_length);
  DBUG_RETURN(find_current_row(buf));
}

/*
  ::info() is used to return information to the optimizer.
  Currently this table handler doesn't implement most of the fields
  really needed. SHOW also makes use of this data
*/
int ha_tina::info(uint flag)
{
  DBUG_ENTER("ha_tina::info");
  /* This is a lie, but you don't want the optimizer to see zero or 1 */
  if (!records_is_known && stats.records < 2) 
    stats.records= 2;
  DBUG_RETURN(0);
}

/*
  Grab bag of flags that are sent to the able handler every so often.
  HA_EXTRA_RESET and HA_EXTRA_RESET_STATE are the most frequently called.
  You are not required to implement any of these.
*/
int ha_tina::extra(enum ha_extra_function operation)
{
  DBUG_ENTER("ha_tina::extra");
 if (operation == HA_EXTRA_MARK_AS_LOG_TABLE)
 {
   pthread_mutex_lock(&share->mutex);
   share->is_log_table= TRUE;
   pthread_mutex_unlock(&share->mutex);
 }
  DBUG_RETURN(0);
}

/*
  Set end_pos to the last valid byte of continuous area, closest
  to the given "hole", stored in the buffer. "Valid" here means,
  not listed in the chain of deleted records ("holes").
*/
bool ha_tina::get_write_pos(off_t *end_pos, tina_set *closest_hole)
{
  if (closest_hole == chain_ptr) /* no more chains */
    *end_pos= file_buff->end();
  else
    *end_pos= min(file_buff->end(),
                  closest_hole->begin);
  return (closest_hole != chain_ptr) && (*end_pos == closest_hole->begin);
}


/*
  Called after each table scan. In particular after deletes,
  and updates. In the last case we employ chain of deleted
  slots to clean up all of the dead space we have collected while
  performing deletes/updates.
*/
int ha_tina::rnd_end()
{
  char updated_fname[FN_REFLEN];
  off_t file_buffer_start= 0;
  DBUG_ENTER("ha_tina::rnd_end");

  records_is_known= 1;

  if ((chain_ptr - chain)  > 0)
  {
    tina_set *ptr= chain;

    /*
      Re-read the beginning of a file (as the buffer should point to the
      end of file after the scan).
    */
    file_buff->init_buff(data_file);

    /*
      The sort is needed when there were updates/deletes with random orders.
      It sorts so that we move the firts blocks to the beginning.
    */
    qsort(chain, (size_t)(chain_ptr - chain), sizeof(tina_set),
          (qsort_cmp)sort_set);

    off_t write_begin= 0, write_end;

    /* create the file to write updated table if it wasn't yet created */
    if (open_update_temp_file_if_needed())
      DBUG_RETURN(-1);

    /* write the file with updated info */
    while ((file_buffer_start != -1))     // while not end of file
    {
      bool in_hole= get_write_pos(&write_end, ptr);

      /* if there is something to write, write it */
      if ((write_end - write_begin) &&
          (my_write(update_temp_file,
                    (uchar*)(file_buff->ptr() +
                            (write_begin - file_buff->start())),
                    write_end - write_begin, MYF_RW)))
        goto error;

      if (in_hole)
      {
        /* skip hole */
        while (file_buff->end() <= ptr->end && file_buffer_start != -1)
          file_buffer_start= file_buff->read_next();
        write_begin= ptr->end;
        ptr++;
      }
      else
        write_begin= write_end;

      if (write_end == file_buff->end())
        file_buffer_start= file_buff->read_next(); /* shift the buffer */

    }

    if (my_sync(update_temp_file, MYF(MY_WME)) ||
        my_close(update_temp_file, MYF(0)))
      DBUG_RETURN(-1);

    share->update_file_opened= FALSE;

    if (share->tina_write_opened)
    {
      if (my_close(share->tina_write_filedes, MYF(0)))
        DBUG_RETURN(-1);
      /*
        Mark that the writer fd is closed, so that init_tina_writer()
        will reopen it later.
      */
      share->tina_write_opened= FALSE;
    }

    /*
      Close opened fildes's. Then move updated file in place
      of the old datafile.
    */
    if (my_close(data_file, MYF(0)) ||
        my_rename(fn_format(updated_fname, share->table_name, "", CSN_EXT,
                            MY_REPLACE_EXT | MY_UNPACK_FILENAME),
                  share->data_file_name, MYF(0)))
      DBUG_RETURN(-1);

    /* Open the file again */
    if (((data_file= my_open(share->data_file_name, O_RDONLY, MYF(0))) == -1))
      DBUG_RETURN(-1);
    /*
      The datafile is consistent at this point and the write filedes is
      closed, so nothing worrying will happen to it in case of a crash.
      Here we record this fact to the meta-file.
    */
    (void)write_meta_file(share->meta_file, share->rows_recorded, FALSE);
  }

  DBUG_RETURN(0);
error:
  my_close(update_temp_file, MYF(0));
  share->update_file_opened= FALSE;
  DBUG_RETURN(-1);
}


/*
  Repair CSV table in the case, it is crashed.

  SYNOPSIS
    repair()
    thd         The thread, performing repair
    check_opt   The options for repair. We do not use it currently.

  DESCRIPTION
    If the file is empty, change # of rows in the file and complete recovery.
    Otherwise, scan the table looking for bad rows. If none were found,
    we mark file as a good one and return. If a bad row was encountered,
    we truncate the datafile up to the last good row.

   TODO: Make repair more clever - it should try to recover subsequent
         rows (after the first bad one) as well.
*/

int ha_tina::repair(THD* thd, HA_CHECK_OPT* check_opt)
{
  char repaired_fname[FN_REFLEN];
  uchar *buf;
  File repair_file;
  int rc;
  ha_rows rows_repaired= 0;
  off_t write_begin= 0, write_end;
  DBUG_ENTER("ha_tina::repair");

  /* empty file */
  if (!share->saved_data_file_length)
  {
    share->rows_recorded= 0;
    goto end;
  }

  /* Don't assert in field::val() functions */
  table->use_all_columns();
  if (!(buf= (uchar*) my_malloc(table->s->reclength, MYF(MY_WME))))
    DBUG_RETURN(HA_ERR_OUT_OF_MEM);

  /* position buffer to the start of the file */
  file_buff->init_buff(data_file);

  /*
    Local_saved_data_file_length is initialized during the lock phase.
    Sometimes this is not getting executed before ::repair (e.g. for
    the log tables). We set it manually here.
  */
  local_saved_data_file_length= share->saved_data_file_length;
  /* set current position to the beginning of the file */
  current_position= next_position= 0;

  /* Read the file row-by-row. If everything is ok, repair is not needed. */
  while (!(rc= find_current_row(buf)))
  {
    rows_repaired++;
    current_position= next_position;
  }

  my_free((char*)buf, MYF(0));

  if (rc == HA_ERR_END_OF_FILE)
  {
    /*
      All rows were read ok until end of file, the file does not need repair.
      If rows_recorded != rows_repaired, we should update rows_recorded value
      to the current amount of rows.
    */
    share->rows_recorded= rows_repaired;
    goto end;
  }

  /*
    Otherwise we've encountered a bad row => repair is needed.
    Let us create a temporary file.
  */
  if ((repair_file= my_create(fn_format(repaired_fname, share->table_name,
                                        "", CSN_EXT,
                                        MY_REPLACE_EXT|MY_UNPACK_FILENAME),
                           0, O_RDWR | O_TRUNC,MYF(MY_WME))) < 0)
    DBUG_RETURN(HA_ERR_CRASHED_ON_REPAIR);

  file_buff->init_buff(data_file);


  /* we just truncated the file up to the first bad row. update rows count. */
  share->rows_recorded= rows_repaired;

  /* write repaired file */
  while (1)
  {
    write_end= min(file_buff->end(), current_position);
    if ((write_end - write_begin) &&
        (my_write(repair_file, (uchar*)file_buff->ptr(),
                  write_end - write_begin, MYF_RW)))
      DBUG_RETURN(-1);

    write_begin= write_end;
    if (write_end== current_position)
      break;
    else
      file_buff->read_next(); /* shift the buffer */
  }

  /*
    Close the files and rename repaired file to the datafile.
    We have to close the files, as on Windows one cannot rename
    a file, which descriptor is still open. EACCES will be returned
    when trying to delete the "to"-file in my_rename().
  */
  if (my_close(data_file,MYF(0)) || my_close(repair_file, MYF(0)) ||
      my_rename(repaired_fname, share->data_file_name, MYF(0)))
    DBUG_RETURN(-1);

  /* Open the file again, it should now be repaired */
  if ((data_file= my_open(share->data_file_name, O_RDWR|O_APPEND,
                          MYF(0))) == -1)
     DBUG_RETURN(-1);

  /* Set new file size. The file size will be updated by ::update_status() */
  local_saved_data_file_length= (size_t) current_position;

end:
  share->crashed= FALSE;
  DBUG_RETURN(HA_ADMIN_OK);
}

/*
  DELETE without WHERE calls this
*/

int ha_tina::delete_all_rows()
{
  int rc;
  DBUG_ENTER("ha_tina::delete_all_rows");

  if (!records_is_known)
    DBUG_RETURN(my_errno=HA_ERR_WRONG_COMMAND);

  if (!share->tina_write_opened)
    if (init_tina_writer())
      DBUG_RETURN(-1);

  /* Truncate the file to zero size */
  rc= my_chsize(share->tina_write_filedes, 0, 0, MYF(MY_WME));

  stats.records=0;
  DBUG_RETURN(rc);
}

/*
  Called by the database to lock the table. Keep in mind that this
  is an internal lock.
*/
THR_LOCK_DATA **ha_tina::store_lock(THD *thd,
                                    THR_LOCK_DATA **to,
                                    enum thr_lock_type lock_type)
{
  if (lock_type != TL_IGNORE && lock.type == TL_UNLOCK)
    lock.type=lock_type;
  *to++= &lock;
  return to;
}

/* 
  Create a table. You do not want to leave the table open after a call to
  this (the database will call ::open() if it needs to).
*/

int ha_tina::create(const char *name, TABLE *table_arg,
                    HA_CREATE_INFO *create_info)
{
  char name_buff[FN_REFLEN];
  File create_file;
  DBUG_ENTER("ha_tina::create");

  if ((create_file= my_create(fn_format(name_buff, name, "", CSM_EXT,
                                        MY_REPLACE_EXT|MY_UNPACK_FILENAME), 0,
                              O_RDWR | O_TRUNC,MYF(MY_WME))) < 0)
    DBUG_RETURN(-1);

  write_meta_file(create_file, 0, FALSE);
  my_close(create_file, MYF(0));

  if ((create_file= my_create(fn_format(name_buff, name, "", CSV_EXT,
                                        MY_REPLACE_EXT|MY_UNPACK_FILENAME),0,
                              O_RDWR | O_TRUNC,MYF(MY_WME))) < 0)
    DBUG_RETURN(-1);

  my_close(create_file, MYF(0));

  DBUG_RETURN(0);
}

int ha_tina::check(THD* thd, HA_CHECK_OPT* check_opt)
{
  int rc= 0;
  uchar *buf;
  const char *old_proc_info;
  ha_rows count= share->rows_recorded;
  DBUG_ENTER("ha_tina::check");

  old_proc_info= thd_proc_info(thd, "Checking table");
  if (!(buf= (uchar*) my_malloc(table->s->reclength, MYF(MY_WME))))
    DBUG_RETURN(HA_ERR_OUT_OF_MEM);

  /* position buffer to the start of the file */
  file_buff->init_buff(data_file);

  /*
    Local_saved_data_file_length is initialized during the lock phase.
    Check does not use store_lock in certain cases. So, we set it
    manually here.
  */
  local_saved_data_file_length= share->saved_data_file_length;
  /* set current position to the beginning of the file */
  current_position= next_position= 0;
  /* Read the file row-by-row. If everything is ok, repair is not needed. */
  while (!(rc= find_current_row(buf)))
  {
    count--;
    current_position= next_position;
  }

  my_free((char*)buf, MYF(0));
  thd_proc_info(thd, old_proc_info);

  if ((rc != HA_ERR_END_OF_FILE) || count)
  {
    share->crashed= TRUE;
    DBUG_RETURN(HA_ADMIN_CORRUPT);
  }
  else
    DBUG_RETURN(HA_ADMIN_OK);
}


bool ha_tina::check_if_incompatible_data(HA_CREATE_INFO *info,
					   uint table_changes)
{
  return COMPATIBLE_DATA_YES;
}

struct st_mysql_storage_engine csv_storage_engine=
{ MYSQL_HANDLERTON_INTERFACE_VERSION };

mysql_declare_plugin(csv)
{
  MYSQL_STORAGE_ENGINE_PLUGIN,
  &csv_storage_engine,
  "CSV",
  "Brian Aker, MySQL AB",
  "CSV storage engine",
  PLUGIN_LICENSE_GPL,
  tina_init_func, /* Plugin Init */
  tina_done_func, /* Plugin Deinit */
  0x0100 /* 1.0 */,
  NULL,                       /* status variables                */
  NULL,                       /* system variables                */
  NULL                        /* config options                  */
}
mysql_declare_plugin_end;