ha_tina.cc 41.6 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
/* 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; either version 2 of the License, or
  (at your option) any later version.

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

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

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

20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
  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.
36 37 38 39 40 41 42 43 44

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
*/

unknown's avatar
unknown committed
45
#ifdef USE_PRAGMA_IMPLEMENTATION
46 47 48 49
#pragma implementation        // gcc: Class implementation
#endif

#include "mysql_priv.h"
unknown's avatar
unknown committed
50

51 52
#include "ha_tina.h"

53
#include <mysql/plugin.h>
unknown's avatar
unknown committed
54

55 56 57 58 59 60 61 62 63
/*
  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
64
#define CSN_EXT ".CSN"               // Files used during repair and update
65 66 67
#define CSM_EXT ".CSM"               // Meta file


68 69 70 71
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);
72

73 74 75 76
/* Stuff for shares */
pthread_mutex_t tina_mutex;
static HASH tina_open_tables;
static int tina_init= 0;
77 78 79
static handler *tina_create_handler(handlerton *hton,
                                    TABLE_SHARE *table, 
                                    MEM_ROOT *mem_root);
80 81
int tina_end(handlerton *hton, ha_panic_function type);

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
off_t Transparent_file::read_next()
{
  off_t bytes_read;

  /*
     No need to seek here, as the file managed by Transparent_file class
     always points to upper_bound byte
  */
  if ((bytes_read= my_read(filedes, buff, buff_size, MYF(0))) == MY_FILE_ERROR)
    return -1;

  /* end of file */
  if (!bytes_read)
    return -1;

  lower_bound= upper_bound;
  upper_bound+= bytes_read;

  return lower_bound;
}


char Transparent_file::get_value(off_t offset)
{
  off_t bytes_read;

  /* check boundaries */
  if ((lower_bound <= offset) && (offset < upper_bound))
    return buff[offset - lower_bound];
  else
  {
    VOID(my_seek(filedes, offset, MY_SEEK_SET, MYF(0)));
    /* read appropriate portion of the file */
    if ((bytes_read= my_read(filedes, buff, buff_size,
                             MYF(0))) == MY_FILE_ERROR)
      return 0;

    lower_bound= offset;
    upper_bound= lower_bound + bytes_read;

    /* end of file */
    if (upper_bound == offset)
      return 0;

    return buff[0];
  }
}
130

131 132 133 134
/*****************************************************************************
 ** TINA tables
 *****************************************************************************/

135
/*
136
  Used for sorting chains with qsort().
137 138 139
*/
int sort_set (tina_set *a, tina_set *b)
{
140 141 142 143
  /*
    We assume that intervals do not intersect. So, it is enought to compare
    any two points. Here we take start of intervals for comparison.
  */
144
  return ( a->begin > b->begin ? 1 : ( a->begin < b->begin ? -1 : 0 ) );
145 146 147 148 149 150 151 152 153
}

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

154
static int tina_init_func(void *p)
unknown's avatar
unknown committed
155
{
156 157
  handlerton *tina_hton;

unknown's avatar
unknown committed
158 159
  if (!tina_init)
  {
160
    tina_hton= (handlerton *)p;
unknown's avatar
unknown committed
161 162 163 164
    tina_init++;
    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);
165 166 167 168
    tina_hton->state= SHOW_OPTION_YES;
    tina_hton->db_type= DB_TYPE_CSV_DB;
    tina_hton->create= tina_create_handler;
    tina_hton->panic= tina_end;
169
    tina_hton->flags= HTON_CAN_RECREATE|HTON_NO_PARTITION;
unknown's avatar
unknown committed
170 171 172 173
  }
  return 0;
}

174
static int tina_done_func(void *p)
unknown's avatar
unknown committed
175 176 177 178 179 180 181 182 183 184 185 186 187
{
  if (tina_init)
  {
    if (tina_open_tables.records)
    {
      return 1;
    }
    hash_free(&tina_open_tables);
    pthread_mutex_destroy(&tina_mutex);
    tina_init--;
  }
  return 0;
}
188

unknown's avatar
unknown committed
189

190 191 192 193 194 195
/*
  Simple lock controls.
*/
static TINA_SHARE *get_share(const char *table_name, TABLE *table)
{
  TINA_SHARE *share;
196
  char meta_file_name[FN_REFLEN];
197
  MY_STAT file_stat;                /* Stat information for the data file */
198 199 200
  char *tmp_name;
  uint length;

201
  if (!tina_init)
202
     tina_init_func(NULL);
203

204 205
  pthread_mutex_lock(&tina_mutex);
  length=(uint) strlen(table_name);
206 207 208 209 210

  /*
    If share is not present in the hash, create a new share and
    initialize its members.
  */
211 212
  if (!(share=(TINA_SHARE*) hash_search(&tina_open_tables,
                                        (byte*) table_name,
213
                                       length)))
214 215
  {
    if (!my_multi_malloc(MYF(MY_WME | MY_ZEROFILL),
216 217
                         &share, sizeof(*share),
                         &tmp_name, length+1,
218
                         NullS))
219 220 221 222 223
    {
      pthread_mutex_unlock(&tina_mutex);
      return NULL;
    }

224
    share->use_count= 0;
225
    share->is_log_table= FALSE;
226 227
    share->table_name_length= length;
    share->table_name= tmp_name;
228 229
    share->crashed= FALSE;
    share->rows_recorded= 0;
230 231
    share->update_file_opened= FALSE;
    share->tina_write_opened= FALSE;
232
    strmov(share->table_name, table_name);
233 234 235
    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,
236
              MY_REPLACE_EXT|MY_UNPACK_FILENAME);
unknown's avatar
unknown committed
237 238 239 240 241

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

242 243 244 245 246
    if (my_hash_insert(&tina_open_tables, (byte*) share))
      goto error;
    thr_lock_init(&share->lock);
    pthread_mutex_init(&share->mutex,MY_MUTEX_INIT_FAST);

247 248 249 250 251 252 253 254 255 256 257
    /*
      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;

    /*
258
      If the meta file will not open we assume it is crashed and
259 260 261 262
      mark it as such.
    */
    if (read_meta_file(share->meta_file, &share->rows_recorded))
      share->crashed= TRUE;
263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279
  }
  share->use_count++;
  pthread_mutex_unlock(&tina_mutex);

  return share;

error2:
  thr_lock_delete(&share->lock);
  pthread_mutex_destroy(&share->mutex);
error:
  pthread_mutex_unlock(&tina_mutex);
  my_free((gptr) share, MYF(0));

  return NULL;
}


280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295
/*
  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
296
    non-zero - error occurred
297 298
*/

299
static int read_meta_file(File meta_file, ha_rows *rows)
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
{
  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, (byte*)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
351
    non-zero - error occurred
352 353
*/

354
static int write_meta_file(File meta_file, ha_rows rows, bool dirty)
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
{
  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, (byte *)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));
}


396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419
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);
}


420 421 422 423 424 425
bool ha_tina::is_crashed() const
{
  DBUG_ENTER("ha_tina::is_crashed");
  DBUG_RETURN(share->crashed);
}

426
/*
427 428 429 430 431 432 433 434
  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){
435 436 437 438 439
    /* 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;
440 441 442 443 444 445 446
    if (share->tina_write_opened)
    {
      if (my_close(share->tina_write_filedes, MYF(0)))
        result_code= 1;
      share->tina_write_opened= FALSE;
    }

447 448 449 450 451 452 453 454 455 456
    hash_delete(&tina_open_tables, (byte*) share);
    thr_lock_delete(&share->lock);
    pthread_mutex_destroy(&share->mutex);
    my_free((gptr) share, MYF(0));
  }
  pthread_mutex_unlock(&tina_mutex);

  DBUG_RETURN(result_code);
}

457
int tina_end(handlerton *hton, ha_panic_function type)
unknown's avatar
unknown committed
458
{
459
  return tina_done_func(NULL);
unknown's avatar
unknown committed
460
}
461

462

463
/*
464 465 466 467 468 469 470
  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
471
*/
472

473 474
off_t find_eoln_buff(Transparent_file *data_buff, off_t begin,
                     off_t end, int *eoln_len)
475
{
unknown's avatar
unknown committed
476
  *eoln_len= 0;
unknown's avatar
unknown committed
477

478
  for (off_t x= begin; x < end; x++)
479 480
  {
    /* Unix (includes Mac OS X) */
481
    if (data_buff->get_value(x) == '\n')
482
      *eoln_len= 1;
unknown's avatar
unknown committed
483
    else
unknown's avatar
unknown committed
484
      if (data_buff->get_value(x) == '\r') // Mac or Dos
485
      {
unknown's avatar
unknown committed
486 487 488 489 490
        /* 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;
491
      }
unknown's avatar
unknown committed
492 493 494

    if (*eoln_len)  // end of line was found
      return x;
495
  }
496 497 498 499

  return 0;
}

500

501 502 503
static handler *tina_create_handler(handlerton *hton,
                                    TABLE_SHARE *table, 
                                    MEM_ROOT *mem_root)
504
{
505
  return new (mem_root) ha_tina(hton, table);
506 507 508
}


509 510
ha_tina::ha_tina(handlerton *hton, TABLE_SHARE *table_arg)
  :handler(hton, table_arg),
511
  /*
unknown's avatar
unknown committed
512 513
    These definitions are found in handler.h
    They are not probably completely right.
514
  */
515
  current_position(0), next_position(0), local_saved_data_file_length(0),
516
  file_buff(0), chain_alloced(0), chain_size(DEFAULT_CHAIN_LENGTH),
517
  records_is_known(0)
518 519
{
  /* Set our original buffers from pre-allocated memory */
520
  buffer.set((char*)byte_buffer, IO_SIZE, system_charset_info);
521
  chain= chain_buffer;
522
  file_buff= new Transparent_file();
523 524
}

525

526 527 528
/*
  Encode a buffer into the quoted format.
*/
unknown's avatar
unknown committed
529

530
int ha_tina::encode_quote(byte *buf)
531 532
{
  char attribute_buffer[1024];
533 534
  String attribute(attribute_buffer, sizeof(attribute_buffer),
                   &my_charset_bin);
535

unknown's avatar
unknown committed
536
  my_bitmap_map *org_bitmap= dbug_tmp_use_all_columns(table, table->read_set);
537 538 539 540 541 542
  buffer.length(0);
  for (Field **field=table->field ; *field ; field++)
  {
    const char *ptr;
    const char *end_ptr;

543 544 545 546 547 548 549 550 551 552 553 554 555 556
    /*
      Write an empty string to the buffer in case of a NULL value.
      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())
      ptr= end_ptr= 0;
    else
    {
      (*field)->val_str(&attribute,&attribute);
      ptr= attribute.ptr();
      end_ptr= attribute.length() + ptr;
    }
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

    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('"');
    buffer.append(',');
  }
  // Remove the comma, add a line feed
  buffer.length(buffer.length() - 1);
  buffer.append('\n');
  //buffer.replace(buffer.length(), 0, "\n", 1);

unknown's avatar
unknown committed
597
  dbug_tmp_restore_column_map(table->read_set, org_bitmap);
598 599 600 601
  return (buffer.length());
}

/*
602
  chain_append() adds delete positions to the chain that we use to keep
603
  track of space. Then the chain will be used to cleanup "holes", occurred
604
  due to deletes and updates.
605 606 607 608 609
*/
int ha_tina::chain_append()
{
  if ( chain_ptr != chain && (chain_ptr -1)->end == current_position)
    (chain_ptr -1)->end= next_position;
610
  else
611 612 613 614 615 616 617 618 619
  {
    /* 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 */
620 621
        if ((chain= (tina_set *) my_realloc((gptr)chain,
                                            chain_size, MYF(MY_WME))) == NULL)
622 623 624 625
          return -1;
      }
      else
      {
626 627
        tina_set *ptr= (tina_set *) my_malloc(chain_size * sizeof(tina_set),
                                              MYF(MY_WME));
628 629 630 631 632 633 634 635 636 637 638 639 640 641 642
        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;
}


643
/*
644 645 646 647
  Scans for a row.
*/
int ha_tina::find_current_row(byte *buf)
{
648
  off_t end_offset, curr_offset= current_position;
unknown's avatar
unknown committed
649
  int eoln_len;
650
  my_bitmap_map *org_bitmap;
651 652
  DBUG_ENTER("ha_tina::find_current_row");

653 654 655 656
  /*
    We do not read further then local_saved_data_file_length in order
    not to conflict with undergoing concurrent insert.
  */
657 658 659
  if ((end_offset=
        find_eoln_buff(file_buff, current_position,
                       local_saved_data_file_length, &eoln_len)) == 0)
660 661
    DBUG_RETURN(HA_ERR_END_OF_FILE);

662 663 664
  /* Avoid asserts in ::store() for columns that are not going to be updated */
  org_bitmap= dbug_tmp_use_all_columns(table, table->write_set);

665 666 667
  for (Field **field=table->field ; *field ; field++)
  {
    buffer.length(0);
668 669
    if (file_buff->get_value(curr_offset) == '"')
      curr_offset++; // Incrementpast the first quote
670
    else
unknown's avatar
unknown committed
671 672
    {
      dbug_tmp_restore_column_map(table->write_set, org_bitmap);
673
      DBUG_RETURN(HA_ERR_CRASHED_ON_USAGE);
unknown's avatar
unknown committed
674
    }
675
    for(;curr_offset != end_offset; curr_offset++)
676
    {
677
      // Need to convert line feeds!
678 679 680 681
      if (file_buff->get_value(curr_offset) == '"' &&
          (((file_buff->get_value(curr_offset + 1) == ',') &&
            (file_buff->get_value(curr_offset + 2) == '"')) ||
           (curr_offset == end_offset -1 )))
682
      {
683
        curr_offset+= 2; // Move past the , and the "
684
        break;
685
      }
686 687
      if (file_buff->get_value(curr_offset) == '\\' &&
          curr_offset != (end_offset - 1))
688
      {
689 690
        curr_offset++;
        if (file_buff->get_value(curr_offset) == 'r')
691
          buffer.append('\r');
692
        else if (file_buff->get_value(curr_offset) == 'n' )
693
          buffer.append('\n');
694 695 696
        else if ((file_buff->get_value(curr_offset) == '\\') ||
                 (file_buff->get_value(curr_offset) == '"'))
          buffer.append(file_buff->get_value(curr_offset));
697 698 699
        else  /* This could only happed with an externally created file */
        {
          buffer.append('\\');
700
          buffer.append(file_buff->get_value(curr_offset));
701
        }
702
      }
703 704 705 706 707 708
      else // ordinary symbol
      {
        /*
          We are at final symbol and no last quote was found =>
          we are working with a damaged file.
        */
709
        if (curr_offset == end_offset - 1)
unknown's avatar
unknown committed
710 711
        {
          dbug_tmp_restore_column_map(table->write_set, org_bitmap);
712
          DBUG_RETURN(HA_ERR_CRASHED_ON_USAGE);
unknown's avatar
unknown committed
713
        }
714
        buffer.append(file_buff->get_value(curr_offset));
715
      }
716
    }
717 718
    if (bitmap_is_set(table->read_set, (*field)->field_index))
      (*field)->store(buffer.ptr(), buffer.length(), system_charset_info);
719
  }
720
  next_position= end_offset + eoln_len;
721
  /* Maybe use \N for null? */
722
  memset(buf, 0, table->s->null_bytes); /* We do not implement nulls! */
unknown's avatar
unknown committed
723
  dbug_tmp_restore_column_map(table->write_set, org_bitmap);
724 725 726 727 728 729 730 731

  DBUG_RETURN(0);
}

/*
  If frm_error() is called in table.cc this is called to find out what file
  extensions exist for this handler.
*/
unknown's avatar
unknown committed
732
static const char *ha_tina_exts[] = {
733 734
  CSV_EXT,
  CSM_EXT,
unknown's avatar
unknown committed
735 736 737
  NullS
};

738
const char **ha_tina::bas_ext() const
unknown's avatar
unknown committed
739 740 741
{
  return ha_tina_exts;
}
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
/*
  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 */
819
  share->saved_data_file_length= local_saved_data_file_length;
820 821 822
}


823 824 825 826
bool ha_tina::check_if_locking_is_allowed(uint sql_command,
                                          ulong type, TABLE *table,
                                          uint count,
                                          bool called_by_logger_thread)
827
{
828 829 830
  if (!called_by_logger_thread)
    return check_if_log_table_locking_is_allowed(sql_command, type, table);

831 832
  return TRUE;
}
833

834
/*
835 836 837 838
  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.
*/
839
int ha_tina::open(const char *name, int mode, uint open_options)
840 841 842 843
{
  DBUG_ENTER("ha_tina::open");

  if (!(share= get_share(name, table)))
844
    DBUG_RETURN(HA_ERR_OUT_OF_MEM);
845

846
  if (share->crashed && !(open_options & HA_OPEN_FOR_REPAIR))
847 848
  {
    free_share(share);
849
    DBUG_RETURN(HA_ERR_CRASHED_ON_USAGE);
850
  }
851

852 853 854
  if ((data_file= my_open(share->data_file_name, O_RDONLY, MYF(0))) == -1)
    DBUG_RETURN(0);

855 856 857 858 859 860
  /*
    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);
861 862
  ref_length=sizeof(off_t);

863 864 865 866
  share->lock.get_status= tina_get_status;
  share->lock.update_status= tina_update_status;
  share->lock.check_status= tina_check_status;

867 868 869 870 871 872
  DBUG_RETURN(0);
}


/*
  Close a database file. We remove ourselves from the shared strucutre.
873
  If it is empty we destroy it.
874 875 876
*/
int ha_tina::close(void)
{
877
  int rc= 0;
878
  DBUG_ENTER("ha_tina::close");
879 880
  rc= my_close(data_file, MYF(0));
  DBUG_RETURN(free_share(share) || rc);
881 882
}

883
/*
884 885 886 887 888 889 890 891 892
  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(byte * buf)
{
  int size;
  DBUG_ENTER("ha_tina::write_row");

893 894 895
  if (share->crashed)
      DBUG_RETURN(HA_ERR_CRASHED_ON_USAGE);

896
  ha_statistic_increment(&SSV::ha_write_count);
897

898 899
  if (table->timestamp_field_type & TIMESTAMP_AUTO_SET_ON_INSERT)
    table->timestamp_field->set_time();
900 901 902

  size= encode_quote(buf);

903 904 905
  if (!share->tina_write_opened)
    if (init_tina_writer())
      DBUG_RETURN(-1);
906

907
   /* use pwrite, as concurrent reader could have changed the position */
unknown's avatar
unknown committed
908
  if (my_write(share->tina_write_filedes, (byte*)buffer.ptr(), size,
909
               MYF(MY_WME | MY_NABP)))
910
    DBUG_RETURN(-1);
911 912

  /* update local copy of the max position to see our own changes */
913
  local_saved_data_file_length+= size;
914

915 916 917
  /* update shared info */
  pthread_mutex_lock(&share->mutex);
  share->rows_recorded++;
918 919 920
  /* update status for the log tables */
  if (share->is_log_table)
    update_status();
921
  pthread_mutex_unlock(&share->mutex);
922

923
  stats.records++;
924 925 926 927
  DBUG_RETURN(0);
}


928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944
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;
}

945
/*
946
  This is called for an update.
947
  Make sure you put in code to increment the auto increment, also
948 949 950 951 952 953 954 955 956 957
  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 byte * old_data, byte * new_data)
{
  int size;
  DBUG_ENTER("ha_tina::update_row");

958
  ha_statistic_increment(&SSV::ha_read_rnd_next_count);
959

960 961
  if (table->timestamp_field_type & TIMESTAMP_AUTO_SET_ON_UPDATE)
    table->timestamp_field->set_time();
962 963 964 965 966 967

  size= encode_quote(new_data);

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

968 969 970 971
  if (open_update_temp_file_if_needed())
    DBUG_RETURN(-1);

  if (my_write(update_temp_file, (byte*)buffer.ptr(), size,
972
               MYF(MY_WME | MY_NABP)))
973
    DBUG_RETURN(-1);
974 975 976 977

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

978 979 980 981
  DBUG_RETURN(0);
}


982 983 984 985 986 987 988 989
/*
  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).
990 991 992 993
*/
int ha_tina::delete_row(const byte * buf)
{
  DBUG_ENTER("ha_tina::delete_row");
994
  ha_statistic_increment(&SSV::ha_delete_count);
995 996 997 998

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

999
  stats.records--;
1000

1001 1002 1003
  /* DELETE should never happen on the log table */
  DBUG_ASSERT(!share->is_log_table);

1004 1005 1006 1007
  DBUG_RETURN(0);
}


1008 1009
/*
  All table scans call this first.
1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032
  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

1033 1034
  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.
1035 1036 1037 1038 1039 1040 1041 1042
  The ::info() call is just for the optimizer.

*/

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

1043 1044
  /* set buffer to the beginning of the file */
  file_buff->init_buff(data_file);
1045 1046 1047
  if (share->crashed)
      DBUG_RETURN(HA_ERR_CRASHED_ON_USAGE);

1048
  current_position= next_position= 0;
1049
  stats.records= 0;
1050
  records_is_known= 0;
1051 1052 1053 1054 1055 1056
  chain_ptr= chain;

  DBUG_RETURN(0);
}

/*
1057 1058 1059 1060
  ::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:
1061
  0Foo  Dog  Friend
1062 1063 1064 1065 1066 1067 1068
  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 :)
1069 1070 1071
*/
int ha_tina::rnd_next(byte *buf)
{
1072
  int rc;
1073 1074
  DBUG_ENTER("ha_tina::rnd_next");

1075 1076 1077
  if (share->crashed)
      DBUG_RETURN(HA_ERR_CRASHED_ON_USAGE);

1078
  ha_statistic_increment(&SSV::ha_read_rnd_next_count);
1079 1080

  current_position= next_position;
1081 1082 1083

  /* don't scan an empty file */
  if (!local_saved_data_file_length)
1084
    DBUG_RETURN(HA_ERR_END_OF_FILE);
1085

1086 1087
  if ((rc= find_current_row(buf)))
    DBUG_RETURN(rc);
1088

1089
  stats.records++;
1090 1091 1092 1093 1094
  DBUG_RETURN(0);
}

/*
  In the case of an order by rows will need to be sorted.
1095
  ::position() is called after each call to ::rnd_next(),
1096
  the data it stores is to a byte array. You can store this
1097 1098 1099
  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
1100 1101 1102 1103 1104
  where something other then a number is stored.
*/
void ha_tina::position(const byte *record)
{
  DBUG_ENTER("ha_tina::position");
unknown's avatar
unknown committed
1105
  my_store_ptr(ref, ref_length, current_position);
1106 1107 1108 1109
  DBUG_VOID_RETURN;
}


1110 1111
/*
  Used to fetch a row from a posiion stored with ::position().
unknown's avatar
unknown committed
1112
  my_get_ptr() retrieves the data for you.
1113 1114 1115 1116 1117
*/

int ha_tina::rnd_pos(byte * buf, byte *pos)
{
  DBUG_ENTER("ha_tina::rnd_pos");
1118
  ha_statistic_increment(&SSV::ha_read_rnd_next_count);
1119
  current_position= (off_t)my_get_ptr(pos,ref_length);
1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131
  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
*/
void 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 */
1132 1133
  if (!records_is_known && stats.records < 2) 
    stats.records= 2;
1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144
  DBUG_VOID_RETURN;
}

/*
  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");
1145 1146 1147 1148 1149 1150
 if (operation == HA_EXTRA_MARK_AS_LOG_TABLE)
 {
   pthread_mutex_lock(&share->mutex);
   share->is_log_table= TRUE;
   pthread_mutex_unlock(&share->mutex);
 }
1151 1152 1153
  DBUG_RETURN(0);
}

1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169
/*
  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);
}


1170
/*
1171 1172 1173 1174
  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.
1175 1176 1177
*/
int ha_tina::rnd_end()
{
1178 1179
  char updated_fname[FN_REFLEN];
  off_t file_buffer_start= 0;
1180 1181
  DBUG_ENTER("ha_tina::rnd_end");

1182 1183
  records_is_known= 1;

1184 1185
  if ((chain_ptr - chain)  > 0)
  {
1186
    tina_set *ptr= chain;
1187

1188
    /*
1189 1190
      Re-read the beginning of a file (as the buffer should point to the
      end of file after the scan).
1191
    */
1192
    file_buff->init_buff(data_file);
1193 1194

    /*
1195 1196
      The sort is needed when there were updates/deletes with random orders.
      It sorts so that we move the firts blocks to the beginning.
1197
    */
1198 1199
    qsort(chain, (size_t)(chain_ptr - chain), sizeof(tina_set),
          (qsort_cmp)sort_set);
1200 1201 1202 1203 1204 1205 1206 1207 1208

    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
1209
    {
1210 1211 1212 1213 1214
      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,
unknown's avatar
unknown committed
1215 1216
                    (byte*)(file_buff->ptr() +
                            (write_begin - file_buff->start())),
1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233
                    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 */

1234 1235
    }

unknown's avatar
unknown committed
1236 1237
    if (my_sync(update_temp_file, MYF(MY_WME)) ||
        my_close(update_temp_file, MYF(0)))
1238 1239
      DBUG_RETURN(-1);

1240
    share->update_file_opened= FALSE;
1241

1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260
    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)))
1261 1262
      DBUG_RETURN(-1);

unknown's avatar
unknown committed
1263 1264
    /* Open the file again */
    if (((data_file= my_open(share->data_file_name, O_RDONLY, MYF(0))) == -1))
1265
      DBUG_RETURN(-1);
1266 1267 1268 1269 1270 1271
    /*
      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);
1272 1273 1274
  }

  DBUG_RETURN(0);
1275 1276 1277 1278
error:
  my_close(update_temp_file, MYF(0));
  share->update_file_opened= FALSE;
  DBUG_RETURN(-1);
1279 1280
}

unknown's avatar
unknown committed
1281

1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299
/*
  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.
*/

1300 1301 1302 1303 1304 1305 1306
int ha_tina::repair(THD* thd, HA_CHECK_OPT* check_opt)
{
  char repaired_fname[FN_REFLEN];
  byte *buf;
  File repair_file;
  int rc;
  ha_rows rows_repaired= 0;
1307
  off_t write_begin= 0, write_end;
1308 1309 1310
  DBUG_ENTER("ha_tina::repair");

  /* empty file */
1311
  if (!share->saved_data_file_length)
1312 1313 1314 1315 1316
  {
    share->rows_recorded= 0;
    goto end;
  }

1317 1318
  /* Don't assert in field::val() functions */
  table->use_all_columns();
1319 1320 1321
  if (!(buf= (byte*) my_malloc(table->s->reclength, MYF(MY_WME))))
    DBUG_RETURN(HA_ERR_OUT_OF_MEM);

1322 1323 1324
  /* position buffer to the start of the file */
  file_buff->init_buff(data_file);

1325 1326 1327 1328 1329
  /*
    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.
  */
1330
  local_saved_data_file_length= share->saved_data_file_length;
1331 1332 1333
  /* set current position to the beginning of the file */
  current_position= next_position= 0;

1334 1335 1336 1337 1338 1339 1340 1341 1342
  /* 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));

1343 1344 1345
  if (rc == HA_ERR_END_OF_FILE)
  {
    /*
1346 1347 1348
      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.
1349 1350
    */
    share->rows_recorded= rows_repaired;
1351
    goto end;
1352
  }
1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363

  /*
    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);

1364 1365 1366
  file_buff->init_buff(data_file);


1367
  /* we just truncated the file up to the first bad row. update rows count. */
1368 1369
  share->rows_recorded= rows_repaired;

1370 1371 1372 1373 1374
  /* write repaired file */
  while (1)
  {
    write_end= min(file_buff->end(), current_position);
    if ((write_end - write_begin) &&
unknown's avatar
unknown committed
1375
        (my_write(repair_file, (byte*)file_buff->ptr(),
1376 1377 1378 1379 1380 1381 1382 1383 1384
                  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 */
  }
1385 1386

  /*
1387 1388 1389 1390
    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().
1391
  */
1392 1393
  if (my_close(data_file,MYF(0)) || my_close(repair_file, MYF(0)) ||
      my_rename(repaired_fname, share->data_file_name, MYF(0)))
1394 1395 1396
    DBUG_RETURN(-1);

  /* Open the file again, it should now be repaired */
1397 1398
  if ((data_file= my_open(share->data_file_name, O_RDWR|O_APPEND,
                          MYF(0))) == -1)
1399 1400
     DBUG_RETURN(-1);

1401 1402
  /* Set new file size. The file size will be updated by ::update_status() */
  local_saved_data_file_length= (size_t) current_position;
1403 1404 1405 1406 1407 1408 1409

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

/*
unknown's avatar
unknown committed
1410
  DELETE without WHERE calls this
1411
*/
unknown's avatar
unknown committed
1412

1413 1414
int ha_tina::delete_all_rows()
{
unknown's avatar
unknown committed
1415
  int rc;
1416 1417
  DBUG_ENTER("ha_tina::delete_all_rows");

1418
  if (!records_is_known)
unknown's avatar
unknown committed
1419
    DBUG_RETURN(my_errno=HA_ERR_WRONG_COMMAND);
1420

1421 1422 1423
  if (!share->tina_write_opened)
    if (init_tina_writer())
      DBUG_RETURN(-1);
1424 1425

  /* Truncate the file to zero size */
1426
  rc= my_chsize(share->tina_write_filedes, 0, 0, MYF(MY_WME));
1427

1428
  stats.records=0;
1429 1430 1431
  DBUG_RETURN(rc);
}

1432
/*
1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450
  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).
*/

1451 1452
int ha_tina::create(const char *name, TABLE *table_arg,
                    HA_CREATE_INFO *create_info)
1453 1454 1455 1456 1457
{
  char name_buff[FN_REFLEN];
  File create_file;
  DBUG_ENTER("ha_tina::create");

1458 1459 1460 1461 1462 1463 1464 1465 1466
  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,
1467
                                        MY_REPLACE_EXT|MY_UNPACK_FILENAME),0,
1468
                              O_RDWR | O_TRUNC,MYF(MY_WME))) < 0)
1469 1470
    DBUG_RETURN(-1);

1471
  my_close(create_file, MYF(0));
1472 1473 1474

  DBUG_RETURN(0);
}
unknown's avatar
unknown committed
1475

1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487
int ha_tina::check(THD* thd, HA_CHECK_OPT* check_opt)
{
  int rc= 0;
  byte *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= (byte*) my_malloc(table->s->reclength, MYF(MY_WME))))
    DBUG_RETURN(HA_ERR_OUT_OF_MEM);

1488 1489 1490
  /* position buffer to the start of the file */
  file_buff->init_buff(data_file);

1491 1492 1493 1494 1495
  /*
    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.
  */
1496
  local_saved_data_file_length= share->saved_data_file_length;
1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510
  /* 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)
  {
1511
    share->crashed= TRUE;
1512 1513 1514 1515 1516 1517 1518
    DBUG_RETURN(HA_ADMIN_CORRUPT);
  }
  else
    DBUG_RETURN(HA_ADMIN_OK);
}


1519 1520 1521 1522 1523 1524
bool ha_tina::check_if_incompatible_data(HA_CREATE_INFO *info,
					   uint table_changes)
{
  return COMPATIBLE_DATA_YES;
}

unknown's avatar
unknown committed
1525
struct st_mysql_storage_engine csv_storage_engine=
1526
{ MYSQL_HANDLERTON_INTERFACE_VERSION };
unknown's avatar
unknown committed
1527 1528

mysql_declare_plugin(csv)
unknown's avatar
unknown committed
1529 1530
{
  MYSQL_STORAGE_ENGINE_PLUGIN,
unknown's avatar
unknown committed
1531 1532
  &csv_storage_engine,
  "CSV",
unknown's avatar
unknown committed
1533
  "Brian Aker, MySQL AB",
unknown's avatar
unknown committed
1534
  "CSV storage engine",
unknown's avatar
unknown committed
1535
  tina_init_func, /* Plugin Init */
unknown's avatar
unknown committed
1536 1537
  tina_done_func, /* Plugin Deinit */
  0x0100 /* 1.0 */,
1538 1539 1540
  NULL,                       /* status variables                */
  NULL,                       /* system variables                */
  NULL                        /* config options                  */
unknown's avatar
unknown committed
1541 1542
}
mysql_declare_plugin_end;
unknown's avatar
unknown committed
1543