fs/fat/fat_write.c

   1 /*
   2  * fat_write.c
   3  *
   4  * R/W (V)FAT 12/16/32 filesystem implementation by Donggeun Kim
   5  *
   6  * See file CREDITS for list of people who contributed to this
   7  * project.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of
  12  * the License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  22  * MA 02111-1307 USA
  23  */
  24
  25 #include <common.h>
  26 #include <command.h>
  27 #include <config.h>
  28 #include <fat.h>
  29 #include <asm/byteorder.h>
  30 #include <part.h>
  31 #include "fat.c"
  32
  33 static void uppercase(char *str, int len)
  34 {
  35         int i;
  36
  37         for (i = 0; i < len; i++) {
  38                 TOUPPER(*str);
  39                 str++;
  40         }
  41 }
  42
  43 static int total_sector;
  44 static int disk_write(__u32 block, __u32 nr_blocks, void *buf)
  45 {
  46         if (!cur_dev || !cur_dev->block_write)
  47                 return -1;
  48
  49         if (cur_part_info.start + block + nr_blocks >
  50                 cur_part_info.start + total_sector) {
  51                 printf("error: overflow occurs\n");
  52                 return -1;
  53         }
  54
  55         return cur_dev->block_write(cur_dev->dev,
  56                         cur_part_info.start + block, nr_blocks, buf);
  57 }
  58
  59 /*
  60  * Set short name in directory entry
  61  */
  62 static void set_name(dir_entry *dirent, const char *filename)
  63 {
  64         char s_name[VFAT_MAXLEN_BYTES];
  65         char *period;
  66         int period_location, len, i, ext_num;
  67
  68         if (filename == NULL)
  69                 return;
  70
  71         len = strlen(filename);
  72         if (len == 0)
  73                 return;
  74
  75         memcpy(s_name, filename, len);
  76         uppercase(s_name, len);
  77
  78         period = strchr(s_name, '.');
  79         if (period == NULL) {
  80                 period_location = len;
  81                 ext_num = 0;
  82         } else {
  83                 period_location = period - s_name;
  84                 ext_num = len - period_location - 1;
  85         }
  86
  87         /* Pad spaces when the length of file name is shorter than eight */
  88         if (period_location < 8) {
  89                 memcpy(dirent->name, s_name, period_location);
  90                 for (i = period_location; i < 8; i++)
  91                         dirent->name[i] = ' ';
  92         } else if (period_location == 8) {
  93                 memcpy(dirent->name, s_name, period_location);
  94         } else {
  95                 memcpy(dirent->name, s_name, 6);
  96                 dirent->name[6] = '~';
  97                 dirent->name[7] = '1';
  98         }
  99
 100         if (ext_num < 3) {
 101                 memcpy(dirent->ext, s_name + period_location + 1, ext_num);
 102                 for (i = ext_num; i < 3; i++)
 103                         dirent->ext[i] = ' ';
 104         } else
 105                 memcpy(dirent->ext, s_name + period_location + 1, 3);
 106
 107         debug("name : %s\n", dirent->name);
 108         debug("ext : %s\n", dirent->ext);
 109 }
 110
 111 static __u8 num_of_fats;
 112 /*
 113  * Write fat buffer into block device
 114  */
 115 static int flush_fat_buffer(fsdata *mydata)
 116 {
 117         int getsize = FATBUFBLOCKS;
 118         __u32 fatlength = mydata->fatlength;
 119         __u8 *bufptr = mydata->fatbuf;
 120         __u32 startblock = mydata->fatbufnum * FATBUFBLOCKS;
 121
 122         fatlength *= mydata->sect_size;
 123         startblock += mydata->fat_sect;
 124
 125         if (getsize > fatlength)
 126                 getsize = fatlength;
 127
 128         /* Write FAT buf */
 129         if (disk_write(startblock, getsize, bufptr) < 0) {
 130                 debug("error: writing FAT blocks\n");
 131                 return -1;
 132         }
 133
 134         if (num_of_fats == 2) {
 135                 /* Update corresponding second FAT blocks */
 136                 startblock += mydata->fatlength;
 137                 if (disk_write(startblock, getsize, bufptr) < 0) {
 138                         debug("error: writing second FAT blocks\n");
 139                         return -1;
 140                 }
 141         }
 142
 143         return 0;
 144 }
 145
 146 /*
 147  * Get the entry at index 'entry' in a FAT (12/16/32) table.
 148  * On failure 0x00 is returned.
 149  * When bufnum is changed, write back the previous fatbuf to the disk.
 150  */
 151 static __u32 get_fatent_value(fsdata *mydata, __u32 entry)
 152 {
 153         __u32 bufnum;
 154         __u32 off16, offset;
 155         __u32 ret = 0x00;
 156         __u16 val1, val2;
 157
 158         switch (mydata->fatsize) {
 159         case 32:
 160                 bufnum = entry / FAT32BUFSIZE;
 161                 offset = entry - bufnum * FAT32BUFSIZE;
 162                 break;
 163         case 16:
 164                 bufnum = entry / FAT16BUFSIZE;
 165                 offset = entry - bufnum * FAT16BUFSIZE;
 166                 break;
 167         case 12:
 168                 bufnum = entry / FAT12BUFSIZE;
 169                 offset = entry - bufnum * FAT12BUFSIZE;
 170                 break;
 171
 172         default:
 173                 /* Unsupported FAT size */
 174                 return ret;
 175         }
 176
 177         debug("FAT%d: entry: 0x%04x = %d, offset: 0x%04x = %d\n",
 178                mydata->fatsize, entry, entry, offset, offset);
 179
 180         /* Read a new block of FAT entries into the cache. */
 181         if (bufnum != mydata->fatbufnum) {
 182                 int getsize = FATBUFBLOCKS;
 183                 __u8 *bufptr = mydata->fatbuf;
 184                 __u32 fatlength = mydata->fatlength;
 185                 __u32 startblock = bufnum * FATBUFBLOCKS;
 186
 187                 if (getsize > fatlength)
 188                         getsize = fatlength;
 189
 190                 fatlength *= mydata->sect_size; /* We want it in bytes now */
 191                 startblock += mydata->fat_sect; /* Offset from start of disk */
 192
 193                 /* Write back the fatbuf to the disk */
 194                 if (mydata->fatbufnum != -1) {
 195                         if (flush_fat_buffer(mydata) < 0)
 196                                 return -1;
 197                 }
 198
 199                 if (disk_read(startblock, getsize, bufptr) < 0) {
 200                         debug("Error reading FAT blocks\n");
 201                         return ret;
 202                 }
 203                 mydata->fatbufnum = bufnum;
 204         }
 205
 206         /* Get the actual entry from the table */
 207         switch (mydata->fatsize) {
 208         case 32:
 209                 ret = FAT2CPU32(((__u32 *) mydata->fatbuf)[offset]);
 210                 break;
 211         case 16:
 212                 ret = FAT2CPU16(((__u16 *) mydata->fatbuf)[offset]);
 213                 break;
 214         case 12:
 215                 off16 = (offset * 3) / 4;
 216
 217                 switch (offset & 0x3) {
 218                 case 0:
 219                         ret = FAT2CPU16(((__u16 *) mydata->fatbuf)[off16]);
 220                         ret &= 0xfff;
 221                         break;
 222                 case 1:
 223                         val1 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]);
 224                         val1 &= 0xf000;
 225                         val2 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16 + 1]);
 226                         val2 &= 0x00ff;
 227                         ret = (val2 << 4) | (val1 >> 12);
 228                         break;
 229                 case 2:
 230                         val1 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]);
 231                         val1 &= 0xff00;
 232                         val2 = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16 + 1]);
 233                         val2 &= 0x000f;
 234                         ret = (val2 << 8) | (val1 >> 8);
 235                         break;
 236                 case 3:
 237                         ret = FAT2CPU16(((__u16 *)mydata->fatbuf)[off16]);
 238                         ret = (ret & 0xfff0) >> 4;
 239                         break;
 240                 default:
 241                         break;
 242                 }
 243                 break;
 244         }
 245         debug("FAT%d: ret: %08x, entry: %08x, offset: %04x\n",
 246                mydata->fatsize, ret, entry, offset);
 247
 248         return ret;
 249 }
 250
 251 #ifdef CONFIG_SUPPORT_VFAT
 252 /*
 253  * Set the file name information from 'name' into 'slotptr',
 254  */
 255 static int str2slot(dir_slot *slotptr, const char *name, int *idx)
 256 {
 257         int j, end_idx = 0;
 258
 259         for (j = 0; j <= 8; j += 2) {
 260                 if (name[*idx] == 0x00) {
 261                         slotptr->name0_4[j] = 0;
 262                         slotptr->name0_4[j + 1] = 0;
 263                         end_idx++;
 264                         goto name0_4;
 265                 }
 266                 slotptr->name0_4[j] = name[*idx];
 267                 (*idx)++;
 268                 end_idx++;
 269         }
 270         for (j = 0; j <= 10; j += 2) {
 271                 if (name[*idx] == 0x00) {
 272                         slotptr->name5_10[j] = 0;
 273                         slotptr->name5_10[j + 1] = 0;
 274                         end_idx++;
 275                         goto name5_10;
 276                 }
 277                 slotptr->name5_10[j] = name[*idx];
 278                 (*idx)++;
 279                 end_idx++;
 280         }
 281         for (j = 0; j <= 2; j += 2) {
 282                 if (name[*idx] == 0x00) {
 283                         slotptr->name11_12[j] = 0;
 284                         slotptr->name11_12[j + 1] = 0;
 285                         end_idx++;
 286                         goto name11_12;
 287                 }
 288                 slotptr->name11_12[j] = name[*idx];
 289                 (*idx)++;
 290                 end_idx++;
 291         }
 292
 293         if (name[*idx] == 0x00)
 294                 return 1;
 295
 296         return 0;
 297 /* Not used characters are filled with 0xff 0xff */
 298 name0_4:
 299         for (; end_idx < 5; end_idx++) {
 300                 slotptr->name0_4[end_idx * 2] = 0xff;
 301                 slotptr->name0_4[end_idx * 2 + 1] = 0xff;
 302         }
 303         end_idx = 5;
 304 name5_10:
 305         end_idx -= 5;
 306         for (; end_idx < 6; end_idx++) {
 307                 slotptr->name5_10[end_idx * 2] = 0xff;
 308                 slotptr->name5_10[end_idx * 2 + 1] = 0xff;
 309         }
 310         end_idx = 11;
 311 name11_12:
 312         end_idx -= 11;
 313         for (; end_idx < 2; end_idx++) {
 314                 slotptr->name11_12[end_idx * 2] = 0xff;
 315                 slotptr->name11_12[end_idx * 2 + 1] = 0xff;
 316         }
 317
 318         return 1;
 319 }
 320
 321 static int is_next_clust(fsdata *mydata, dir_entry *dentptr);
 322 static void flush_dir_table(fsdata *mydata, dir_entry **dentptr);
 323
 324 /*
 325  * Fill dir_slot entries with appropriate name, id, and attr
 326  * The real directory entry is returned by 'dentptr'
 327  */
 328 static void
 329 fill_dir_slot(fsdata *mydata, dir_entry **dentptr, const char *l_name)
 330 {
 331         dir_slot *slotptr = (dir_slot *)get_vfatname_block;
 332         __u8 counter = 0, checksum;
 333         int idx = 0, ret;
 334         char s_name[16];
 335
 336         /* Get short file name and checksum value */
 337         strncpy(s_name, (*dentptr)->name, 16);
 338         checksum = mkcksum(s_name);
 339
 340         do {
 341                 memset(slotptr, 0x00, sizeof(dir_slot));
 342                 ret = str2slot(slotptr, l_name, &idx);
 343                 slotptr->id = ++counter;
 344                 slotptr->attr = ATTR_VFAT;
 345                 slotptr->alias_checksum = checksum;
 346                 slotptr++;
 347         } while (ret == 0);
 348
 349         slotptr--;
 350         slotptr->id |= LAST_LONG_ENTRY_MASK;
 351
 352         while (counter >= 1) {
 353                 if (is_next_clust(mydata, *dentptr)) {
 354                         /* A new cluster is allocated for directory table */
 355                         flush_dir_table(mydata, dentptr);
 356                 }
 357                 memcpy(*dentptr, slotptr, sizeof(dir_slot));
 358                 (*dentptr)++;
 359                 slotptr--;
 360                 counter--;
 361         }
 362
 363         if (is_next_clust(mydata, *dentptr)) {
 364                 /* A new cluster is allocated for directory table */
 365                 flush_dir_table(mydata, dentptr);
 366         }
 367 }
 368
 369 static __u32 dir_curclust;
 370
 371 /*
 372  * Extract the full long filename starting at 'retdent' (which is really
 373  * a slot) into 'l_name'. If successful also copy the real directory entry
 374  * into 'retdent'
 375  * If additional adjacent cluster for directory entries is read into memory,
 376  * then 'get_vfatname_block' is copied into 'get_dentfromdir_block' and
 377  * the location of the real directory entry is returned by 'retdent'
 378  * Return 0 on success, -1 otherwise.
 379  */
 380 static int
 381 get_long_file_name(fsdata *mydata, int curclust, __u8 *cluster,
 382               dir_entry **retdent, char *l_name)
 383 {
 384         dir_entry *realdent;
 385         dir_slot *slotptr = (dir_slot *)(*retdent);
 386         dir_slot *slotptr2 = NULL;
 387         __u8 *buflimit = cluster + mydata->sect_size * ((curclust == 0) ?
 388                                                         PREFETCH_BLOCKS :
 389                                                         mydata->clust_size);
 390         __u8 counter = (slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff;
 391         int idx = 0, cur_position = 0;
 392
 393         if (counter > VFAT_MAXSEQ) {
 394                 debug("Error: VFAT name is too long\n");
 395                 return -1;
 396         }
 397
 398         while ((__u8 *)slotptr < buflimit) {
 399                 if (counter == 0)
 400                         break;
 401                 if (((slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff) != counter)
 402                         return -1;
 403                 slotptr++;
 404                 counter--;
 405         }
 406
 407         if ((__u8 *)slotptr >= buflimit) {
 408                 if (curclust == 0)
 409                         return -1;
 410                 curclust = get_fatent_value(mydata, dir_curclust);
 411                 if (CHECK_CLUST(curclust, mydata->fatsize)) {
 412                         debug("curclust: 0x%x\n", curclust);
 413                         printf("Invalid FAT entry\n");
 414                         return -1;
 415                 }
 416
 417                 dir_curclust = curclust;
 418
 419                 if (get_cluster(mydata, curclust, get_vfatname_block,
 420                                 mydata->clust_size * mydata->sect_size) != 0) {
 421                         debug("Error: reading directory block\n");
 422                         return -1;
 423                 }
 424
 425                 slotptr2 = (dir_slot *)get_vfatname_block;
 426                 while (counter > 0) {
 427                         if (((slotptr2->id & ~LAST_LONG_ENTRY_MASK)
 428                             & 0xff) != counter)
 429                                 return -1;
 430                         slotptr2++;
 431                         counter--;
 432                 }
 433
 434                 /* Save the real directory entry */
 435                 realdent = (dir_entry *)slotptr2;
 436                 while ((__u8 *)slotptr2 > get_vfatname_block) {
 437                         slotptr2--;
 438                         slot2str(slotptr2, l_name, &idx);
 439                 }
 440         } else {
 441                 /* Save the real directory entry */
 442                 realdent = (dir_entry *)slotptr;
 443         }
 444
 445         do {
 446                 slotptr--;
 447                 if (slot2str(slotptr, l_name, &idx))
 448                         break;
 449         } while (!(slotptr->id & LAST_LONG_ENTRY_MASK));
 450
 451         l_name[idx] = '\0';
 452         if (*l_name == DELETED_FLAG)
 453                 *l_name = '\0';
 454         else if (*l_name == aRING)
 455                 *l_name = DELETED_FLAG;
 456         downcase(l_name);
 457
 458         /* Return the real directory entry */
 459         *retdent = realdent;
 460
 461         if (slotptr2) {
 462                 memcpy(get_dentfromdir_block, get_vfatname_block,
 463                         mydata->clust_size * mydata->sect_size);
 464                 cur_position = (__u8 *)realdent - get_vfatname_block;
 465                 *retdent = (dir_entry *) &get_dentfromdir_block[cur_position];
 466         }
 467
 468         return 0;
 469 }
 470
 471 static int
 472 delete_long_file_name(fsdata *mydata, int curclust, __u8 *cluster,
 473               dir_entry **retdent)
 474 {
 475         dir_entry *realdent;
 476         dir_slot *slotptr = (dir_slot *)(*retdent);
 477         dir_slot *slotptr2 = NULL;
 478         __u8 *buflimit = cluster + mydata->sect_size * ((curclust == 0) ?
 479                                                         PREFETCH_BLOCKS :
 480                                                         mydata->clust_size);
 481         __u8 counter = (slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff;
 482
 483         if (counter > VFAT_MAXSEQ) {
 484                 debug("Error: VFAT name is too long\n");
 485                 return -1;
 486         }
 487
 488         while ((__u8 *)slotptr < buflimit) {
 489                 if (counter == 0)
 490                         break;
 491                 if (((slotptr->id & ~LAST_LONG_ENTRY_MASK) & 0xff) != counter)
 492                         return -1;
 493                 slotptr->id = DELETED_FLAG;
 494                 slotptr++;
 495                 counter--;
 496         }
 497
 498         if ((__u8 *)slotptr >= buflimit) {
 499                 if (curclust == 0)
 500                         return -1;
 501                 curclust = get_fatent_value(mydata, dir_curclust);
 502                 if (CHECK_CLUST(curclust, mydata->fatsize)) {
 503                         debug("curclust: 0x%x\n", curclust);
 504                         printf("Invalid FAT entry\n");
 505                         return -1;
 506                 }
 507
 508                 dir_curclust = curclust;
 509
 510                 if (get_cluster(mydata, curclust, get_vfatname_block,
 511                                 mydata->clust_size * mydata->sect_size) != 0) {
 512                         debug("Error: reading directory block\n");
 513                         return -1;
 514                 }
 515
 516                 slotptr2 = (dir_slot *)get_vfatname_block;
 517                 while (counter > 0) {
 518                         if (((slotptr2->id & ~LAST_LONG_ENTRY_MASK)
 519                             & 0xff) != counter)
 520                                 return -1;
 521                         slotptr2->id = DELETED_FLAG;
 522                         slotptr2++;
 523                         counter--;
 524                 }
 525
 526                 /* Save the real directory entry */
 527                 realdent = (dir_entry *)slotptr2;
 528         } else {
 529                 /* Save the real directory entry */
 530                 realdent = (dir_entry *)slotptr;
 531         }
 532         realdent->name[0] = DELETED_FLAG;
 533
 534         return 0;
 535 }
 536 #endif
 537
 538 /*
 539  * Set the entry at index 'entry' in a FAT (16/32) table.
 540  */
 541 static int set_fatent_value(fsdata *mydata, __u32 entry, __u32 entry_value)
 542 {
 543         __u32 bufnum, offset;
 544
 545         switch (mydata->fatsize) {
 546         case 32:
 547                 bufnum = entry / FAT32BUFSIZE;
 548                 offset = entry - bufnum * FAT32BUFSIZE;
 549                 break;
 550         case 16:
 551                 bufnum = entry / FAT16BUFSIZE;
 552                 offset = entry - bufnum * FAT16BUFSIZE;
 553                 break;
 554         default:
 555                 /* Unsupported FAT size */
 556                 return -1;
 557         }
 558
 559         /* Read a new block of FAT entries into the cache. */
 560         if (bufnum != mydata->fatbufnum) {
 561                 int getsize = FATBUFBLOCKS;
 562                 __u8 *bufptr = mydata->fatbuf;
 563                 __u32 fatlength = mydata->fatlength;
 564                 __u32 startblock = bufnum * FATBUFBLOCKS;
 565
 566                 fatlength *= mydata->sect_size;
 567                 startblock += mydata->fat_sect;
 568
 569                 if (getsize > fatlength)
 570                         getsize = fatlength;
 571
 572                 if (mydata->fatbufnum != -1) {
 573                         if (flush_fat_buffer(mydata) < 0)
 574                                 return -1;
 575                 }
 576
 577                 if (disk_read(startblock, getsize, bufptr) < 0) {
 578                         debug("Error reading FAT blocks\n");
 579                         return -1;
 580                 }
 581                 mydata->fatbufnum = bufnum;
 582         }
 583
 584         /* Set the actual entry */
 585         switch (mydata->fatsize) {
 586         case 32:
 587                 ((__u32 *) mydata->fatbuf)[offset] = cpu_to_le32(entry_value);
 588                 break;
 589         case 16:
 590                 ((__u16 *) mydata->fatbuf)[offset] = cpu_to_le16(entry_value);
 591                 break;
 592         default:
 593                 return -1;
 594         }
 595
 596         return 0;
 597 }
 598
 599 /*
 600  * Determine the entry value at index 'entry' in a FAT (16/32) table
 601  */
 602 static __u32 determine_fatent(fsdata *mydata, __u32 entry)
 603 {
 604         __u32 next_fat, next_entry = entry + 1;
 605
 606         while (1) {
 607                 next_fat = get_fatent_value(mydata, next_entry);
 608                 if (next_fat == 0) {
 609                         set_fatent_value(mydata, entry, next_entry);
 610                         break;
 611                 }
 612                 next_entry++;
 613         }
 614         debug("FAT%d: entry: %08x, entry_value: %04x\n",
 615                mydata->fatsize, entry, next_entry);
 616
 617         return next_entry;
 618 }
 619
 620 /*
 621  * Write at most 'size' bytes from 'buffer' into the specified cluster.
 622  * Return 0 on success, -1 otherwise.
 623  */
 624 static int
 625 set_cluster(fsdata *mydata, __u32 clustnum, __u8 *buffer,
 626              unsigned long size)
 627 {
 628         int idx = 0;
 629         __u32 startsect;
 630
 631         if (clustnum > 0)
 632                 startsect = mydata->data_begin +
 633                                 clustnum * mydata->clust_size;
 634         else
 635                 startsect = mydata->rootdir_sect;
 636
 637         debug("clustnum: %d, startsect: %d\n", clustnum, startsect);
 638
 639         if (disk_write(startsect, size / mydata->sect_size, buffer) < 0) {
 640                 debug("Error writing data\n");
 641                 return -1;
 642         }
 643
 644         if (size % mydata->sect_size) {
 645                 __u8 tmpbuf[mydata->sect_size];
 646
 647                 idx = size / mydata->sect_size;
 648                 buffer += idx * mydata->sect_size;
 649                 memcpy(tmpbuf, buffer, size % mydata->sect_size);
 650
 651                 if (disk_write(startsect + idx, 1, tmpbuf) < 0) {
 652                         debug("Error writing data\n");
 653                         return -1;
 654                 }
 655
 656                 return 0;
 657         }
 658
 659         return 0;
 660 }
 661
 662 /*
 663  * Find the first empty cluster
 664  */
 665 static int find_empty_cluster(fsdata *mydata)
 666 {
 667         __u32 fat_val, entry = 3;
 668
 669         while (1) {
 670                 fat_val = get_fatent_value(mydata, entry);
 671                 if (fat_val == 0)
 672                         break;
 673                 entry++;
 674         }
 675
 676         return entry;
 677 }
 678
 679 /*
 680  * Write directory entries in 'get_dentfromdir_block' to block device
 681  */
 682 static void flush_dir_table(fsdata *mydata, dir_entry **dentptr)
 683 {
 684         int dir_newclust = 0;
 685
 686         if (set_cluster(mydata, dir_curclust,
 687                     get_dentfromdir_block,
 688                     mydata->clust_size * mydata->sect_size) != 0) {
 689                 printf("error: wrinting directory entry\n");
 690                 return;
 691         }
 692         dir_newclust = find_empty_cluster(mydata);
 693         set_fatent_value(mydata, dir_curclust, dir_newclust);
 694         if (mydata->fatsize == 32)
 695                 set_fatent_value(mydata, dir_newclust, 0xffffff8);
 696         else if (mydata->fatsize == 16)
 697                 set_fatent_value(mydata, dir_newclust, 0xfff8);
 698
 699         dir_curclust = dir_newclust;
 700
 701         if (flush_fat_buffer(mydata) < 0)
 702                 return;
 703
 704         memset(get_dentfromdir_block, 0x00,
 705                 mydata->clust_size * mydata->sect_size);
 706
 707         *dentptr = (dir_entry *) get_dentfromdir_block;
 708 }
 709
 710 /*
 711  * Set empty cluster from 'entry' to the end of a file
 712  */
 713 static int clear_fatent(fsdata *mydata, __u32 entry)
 714 {
 715         __u32 fat_val;
 716
 717         while (1) {
 718                 fat_val = get_fatent_value(mydata, entry);
 719                 if (fat_val != 0)
 720                         set_fatent_value(mydata, entry, 0);
 721                 else
 722                         break;
 723
 724                 if (fat_val == 0xfffffff || fat_val == 0xffff)
 725                         break;
 726
 727                 entry = fat_val;
 728         }
 729
 730         /* Flush fat buffer */
 731         if (flush_fat_buffer(mydata) < 0)
 732                 return -1;
 733
 734         return 0;
 735 }
 736
 737 /*
 738  * Write at most 'maxsize' bytes from 'buffer' into
 739  * the file associated with 'dentptr'
 740  * Return the number of bytes read or -1 on fatal errors.
 741  */
 742 static int
 743 set_contents(fsdata *mydata, dir_entry *dentptr, __u8 *buffer,
 744               unsigned long maxsize)
 745 {
 746         unsigned long filesize = FAT2CPU32(dentptr->size), gotsize = 0;
 747         unsigned int bytesperclust = mydata->clust_size * mydata->sect_size;
 748         __u32 curclust = START(dentptr);
 749         __u32 endclust = 0, newclust = 0;
 750         unsigned long actsize;
 751
 752         debug("Filesize: %ld bytes\n", filesize);
 753
 754         if (maxsize > 0 && filesize > maxsize)
 755                 filesize = maxsize;
 756
 757         debug("%ld bytes\n", filesize);
 758
 759         actsize = bytesperclust;
 760         endclust = curclust;
 761         do {
 762                 /* search for consecutive clusters */
 763                 while (actsize < filesize) {
 764                         newclust = determine_fatent(mydata, endclust);
 765
 766                         if ((newclust - 1) != endclust)
 767                                 goto getit;
 768
 769                         if (CHECK_CLUST(newclust, mydata->fatsize)) {
 770                                 debug("curclust: 0x%x\n", newclust);
 771                                 debug("Invalid FAT entry\n");
 772                                 return gotsize;
 773                         }
 774                         endclust = newclust;
 775                         actsize += bytesperclust;
 776                 }
 777                 /* actsize >= file size */
 778                 actsize -= bytesperclust;
 779                 /* set remaining clusters */
 780                 if (set_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
 781                         debug("error: writing cluster\n");
 782                         return -1;
 783                 }
 784
 785                 /* set remaining bytes */
 786                 gotsize += (int)actsize;
 787                 filesize -= actsize;
 788                 buffer += actsize;
 789                 actsize = filesize;
 790
 791                 if (set_cluster(mydata, endclust, buffer, (int)actsize) != 0) {
 792                         debug("error: writing cluster\n");
 793                         return -1;
 794                 }
 795                 gotsize += actsize;
 796
 797                 /* Mark end of file in FAT */
 798                 if (mydata->fatsize == 16)
 799                         newclust = 0xffff;
 800                 else if (mydata->fatsize == 32)
 801                         newclust = 0xfffffff;
 802                 set_fatent_value(mydata, endclust, newclust);
 803
 804                 return gotsize;
 805 getit:
 806                 if (set_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
 807                         debug("error: writing cluster\n");
 808                         return -1;
 809                 }
 810                 gotsize += (int)actsize;
 811                 filesize -= actsize;
 812                 buffer += actsize;
 813
 814                 if (CHECK_CLUST(curclust, mydata->fatsize)) {
 815                         debug("curclust: 0x%x\n", curclust);
 816                         debug("Invalid FAT entry\n");
 817                         return gotsize;
 818                 }
 819                 actsize = bytesperclust;
 820                 curclust = endclust = newclust;
 821         } while (1);
 822 }
 823
 824 /*
 825  * Fill dir_entry
 826  */
 827 static void fill_dentry(fsdata *mydata, dir_entry *dentptr,
 828         const char *filename, __u32 start_cluster, __u32 size, __u8 attr)
 829 {
 830         if (mydata->fatsize == 32)
 831                 dentptr->starthi =
 832                         cpu_to_le16((start_cluster & 0xffff0000) >> 16);
 833         dentptr->start = cpu_to_le16(start_cluster & 0xffff);
 834         dentptr->size = cpu_to_le32(size);
 835
 836         dentptr->attr = attr;
 837
 838         set_name(dentptr, filename);
 839 }
 840
 841 /*
 842  * Check whether adding a file makes the file system to
 843  * exceed the size of the block device
 844  * Return -1 when overflow occurs, otherwise return 0
 845  */
 846 static int check_overflow(fsdata *mydata, __u32 clustnum, unsigned long size)
 847 {
 848         __u32 startsect, sect_num;
 849
 850         if (clustnum > 0) {
 851                 startsect = mydata->data_begin +
 852                                 clustnum * mydata->clust_size;
 853         } else {
 854                 startsect = mydata->rootdir_sect;
 855         }
 856
 857         sect_num = size / mydata->sect_size;
 858         if (size % mydata->sect_size)
 859                 sect_num++;
 860
 861         if (startsect + sect_num > cur_part_info.start + total_sector)
 862                 return -1;
 863
 864         return 0;
 865 }
 866
 867 /*
 868  * Check if adding several entries exceed one cluster boundary
 869  */
 870 static int is_next_clust(fsdata *mydata, dir_entry *dentptr)
 871 {
 872         int cur_position;
 873
 874         cur_position = (__u8 *)dentptr - get_dentfromdir_block;
 875
 876         if (cur_position >= mydata->clust_size * mydata->sect_size)
 877                 return 1;
 878         else
 879                 return 0;
 880 }
 881
 882 static dir_entry *empty_dentptr;
 883 /*
 884  * Find a directory entry based on filename or start cluster number
 885  * If the directory entry is not found,
 886  * the new position for writing a directory entry will be returned
 887  */
 888 static dir_entry *find_directory_entry(fsdata *mydata, int startsect,
 889         char *filename, dir_entry *retdent, __u32 start)
 890 {
 891         __u32 curclust = (startsect - mydata->data_begin) / mydata->clust_size;
 892
 893         debug("get_dentfromdir: %s\n", filename);
 894
 895         while (1) {
 896                 dir_entry *dentptr;
 897
 898                 int i;
 899
 900                 if (get_cluster(mydata, curclust, get_dentfromdir_block,
 901                             mydata->clust_size * mydata->sect_size) != 0) {
 902                         printf("Error: reading directory block\n");
 903                         return NULL;
 904                 }
 905
 906                 dentptr = (dir_entry *)get_dentfromdir_block;
 907
 908                 dir_curclust = curclust;
 909
 910                 for (i = 0; i < DIRENTSPERCLUST; i++) {
 911                         char s_name[14], l_name[VFAT_MAXLEN_BYTES];
 912
 913                         l_name[0] = '\0';
 914                         if (dentptr->name[0] == DELETED_FLAG) {
 915                                 dentptr++;
 916                                 if (is_next_clust(mydata, dentptr))
 917                                         break;
 918                                 continue;
 919                         }
 920                         if ((dentptr->attr & ATTR_VOLUME)) {
 921 #ifdef CONFIG_SUPPORT_VFAT
 922                                 if ((dentptr->attr & ATTR_VFAT) &&
 923                                     (dentptr->name[0] & LAST_LONG_ENTRY_MASK)) {
 924                                         get_long_file_name(mydata, curclust,
 925                                                      get_dentfromdir_block,
 926                                                      &dentptr, l_name);
 927                                         debug("vfatname: |%s|\n", l_name);
 928                                 } else
 929 #endif
 930                                 {
 931                                         /* Volume label or VFAT entry */
 932                                         dentptr++;
 933                                         if (is_next_clust(mydata, dentptr))
 934                                                 break;
 935                                         continue;
 936                                 }
 937                         }
 938                         if (dentptr->name[0] == 0) {
 939                                 debug("Dentname == NULL - %d\n", i);
 940                                 empty_dentptr = dentptr;
 941                                 return NULL;
 942                         }
 943
 944                         get_name(dentptr, s_name);
 945
 946                         if (strcmp(filename, s_name)
 947                             && strcmp(filename, l_name)) {
 948                                 debug("Mismatch: |%s|%s|\n",
 949                                         s_name, l_name);
 950                                 dentptr++;
 951                                 if (is_next_clust(mydata, dentptr))
 952                                         break;
 953                                 continue;
 954                         }
 955
 956                         memcpy(retdent, dentptr, sizeof(dir_entry));
 957
 958                         debug("DentName: %s", s_name);
 959                         debug(", start: 0x%x", START(dentptr));
 960                         debug(", size:  0x%x %s\n",
 961                               FAT2CPU32(dentptr->size),
 962                               (dentptr->attr & ATTR_DIR) ?
 963                               "(DIR)" : "");
 964
 965                         return dentptr;
 966                 }
 967
 968                 curclust = get_fatent_value(mydata, dir_curclust);
 969                 if ((curclust >= 0xffffff8) || (curclust >= 0xfff8)) {
 970                         empty_dentptr = dentptr;
 971                         return NULL;
 972                 }
 973                 if (CHECK_CLUST(curclust, mydata->fatsize)) {
 974                         debug("curclust: 0x%x\n", curclust);
 975                         debug("Invalid FAT entry\n");
 976                         return NULL;
 977                 }
 978         }
 979
 980         return NULL;
 981 }
 982
 983 static int do_fat_write(const char *filename, void *buffer,
 984         unsigned long size)
 985 {
 986         dir_entry *dentptr, *retdent;
 987         __u32 startsect;
 988         __u32 start_cluster;
 989         boot_sector bs;
 990         volume_info volinfo;
 991         fsdata datablock;
 992         fsdata *mydata = &datablock;
 993         int cursect;
 994         int ret = -1, name_len;
 995         char l_filename[VFAT_MAXLEN_BYTES];
 996         int write_size = size;
 997
 998         dir_curclust = 0;
 999
1000         if (read_bootsectandvi(&bs, &volinfo, &mydata->fatsize)) {
1001                 debug("error: reading boot sector\n");
1002                 return -1;
1003         }
1004
1005         total_sector = bs.total_sect;
1006         if (total_sector == 0)
1007                 total_sector = cur_part_info.size;
1008
1009         if (mydata->fatsize == 32)
1010                 mydata->fatlength = bs.fat32_length;
1011         else
1012                 mydata->fatlength = bs.fat_length;
1013
1014         mydata->fat_sect = bs.reserved;
1015
1016         cursect = mydata->rootdir_sect
1017                 = mydata->fat_sect + mydata->fatlength * bs.fats;
1018         num_of_fats = bs.fats;
1019
1020         mydata->sect_size = (bs.sector_size[1] << 8) + bs.sector_size[0];
1021         mydata->clust_size = bs.cluster_size;
1022
1023         if (mydata->fatsize == 32) {
1024                 mydata->data_begin = mydata->rootdir_sect -
1025                                         (mydata->clust_size * 2);
1026         } else {
1027                 int rootdir_size;
1028
1029                 rootdir_size = ((bs.dir_entries[1]  * (int)256 +
1030                                  bs.dir_entries[0]) *
1031                                  sizeof(dir_entry)) /
1032                                  mydata->sect_size;
1033                 mydata->data_begin = mydata->rootdir_sect +
1034                                         rootdir_size -
1035                                         (mydata->clust_size * 2);
1036         }
1037
1038         mydata->fatbufnum = -1;
1039         mydata->fatbuf = malloc(FATBUFSIZE);
1040         if (mydata->fatbuf == NULL) {
1041                 debug("Error: allocating memory\n");
1042                 return -1;
1043         }
1044
1045         if (disk_read(cursect,
1046                 (mydata->fatsize == 32) ?
1047                 (mydata->clust_size) :
1048                 PREFETCH_BLOCKS, do_fat_read_block) < 0) {
1049                 debug("Error: reading rootdir block\n");
1050                 goto exit;
1051         }
1052         dentptr = (dir_entry *) do_fat_read_block;
1053
1054         name_len = strlen(filename);
1055         if (name_len >= VFAT_MAXLEN_BYTES)
1056                 name_len = VFAT_MAXLEN_BYTES - 1;
1057
1058         memcpy(l_filename, filename, name_len);
1059         l_filename[name_len] = 0; /* terminate the string */
1060         downcase(l_filename);
1061
1062         startsect = mydata->rootdir_sect;
1063         retdent = find_directory_entry(mydata, startsect,
1064                                 l_filename, dentptr, 0);
1065         if (retdent) {
1066                 /* Update file size and start_cluster in a directory entry */
1067                 retdent->size = cpu_to_le32(size);
1068                 start_cluster = FAT2CPU16(retdent->start);
1069                 if (mydata->fatsize == 32)
1070                         start_cluster |=
1071                                 (FAT2CPU16(retdent->starthi) << 16);
1072
1073                 ret = check_overflow(mydata, start_cluster, size);
1074                 if (ret) {
1075                         printf("Error: %ld overflow\n", size);
1076                         goto exit;
1077                 }
1078
1079                 ret = clear_fatent(mydata, start_cluster);
1080                 if (ret) {
1081                         printf("Error: clearing FAT entries\n");
1082                         goto exit;
1083                 }
1084
1085                 ret = set_contents(mydata, retdent, buffer, size);
1086                 if (ret < 0) {
1087                         printf("Error: writing contents\n");
1088                         goto exit;
1089                 }
1090                 write_size = ret;
1091                 debug("attempt to write 0x%x bytes\n", write_size);
1092
1093                 /* Flush fat buffer */
1094                 ret = flush_fat_buffer(mydata);
1095                 if (ret) {
1096                         printf("Error: flush fat buffer\n");
1097                         goto exit;
1098                 }
1099
1100                 /* Write directory table to device */
1101                 ret = set_cluster(mydata, dir_curclust,
1102                             get_dentfromdir_block,
1103                             mydata->clust_size * mydata->sect_size);
1104                 if (ret) {
1105                         printf("Error: writing directory entry\n");
1106                         goto exit;
1107                 }
1108         } else {
1109                 /* Set short name to set alias checksum field in dir_slot */
1110                 set_name(empty_dentptr, filename);
1111                 fill_dir_slot(mydata, &empty_dentptr, filename);
1112
1113                 ret = start_cluster = find_empty_cluster(mydata);
1114                 if (ret < 0) {
1115                         printf("Error: finding empty cluster\n");
1116                         goto exit;
1117                 }
1118
1119                 ret = check_overflow(mydata, start_cluster, size);
1120                 if (ret) {
1121                         printf("Error: %ld overflow\n", size);
1122                         goto exit;
1123                 }
1124
1125                 /* Set attribute as archieve for regular file */
1126                 fill_dentry(mydata, empty_dentptr, filename,
1127                         start_cluster, size, 0x20);
1128
1129                 ret = set_contents(mydata, empty_dentptr, buffer, size);
1130                 if (ret < 0) {
1131                         printf("Error: writing contents\n");
1132                         goto exit;
1133                 }
1134                 write_size = ret;
1135                 debug("attempt to write 0x%x bytes\n", write_size);
1136
1137                 /* Flush fat buffer */
1138                 ret = flush_fat_buffer(mydata);
1139                 if (ret) {
1140                         printf("Error: flush fat buffer\n");
1141                         goto exit;
1142                 }
1143
1144                 /* Write directory table to device */
1145                 ret = set_cluster(mydata, dir_curclust,
1146                             get_dentfromdir_block,
1147                             mydata->clust_size * mydata->sect_size);
1148                 if (ret) {
1149                         printf("Error: writing directory entry\n");
1150                         goto exit;
1151                 }
1152         }
1153
1154 exit:
1155         free(mydata->fatbuf);
1156         return ret < 0 ? ret : write_size;
1157 }
1158
1159 int file_fat_write(const char *filename, void *buffer, unsigned long maxsize)
1160 {
1161         printf("writing %s\n", filename);
1162         return do_fat_write(filename, buffer, maxsize);
1163 }
1164
1165 static int delete_fatent(fsdata *mydata, __u32 entry)
1166 {
1167         __u32 fat_val;
1168
1169         while (1) {
1170                 fat_val = get_fatent_value(mydata, entry);
1171                 if (fat_val != 0) {
1172                         set_fatent_value(mydata, entry, 0);
1173                 }
1174                 else
1175                         break;
1176
1177                 if (fat_val == 0xfffffff || fat_val == 0xffff) {
1178                         break;
1179                 }
1180
1181                 entry = fat_val;
1182         }
1183
1184         /* Flush fat buffer */
1185         if (flush_fat_buffer(mydata) < 0)
1186                 return -1;
1187
1188         return 0;
1189 }
1190
1191 static dir_entry *delete_directory_entry(fsdata *mydata, int startsect,
1192         char *filename, dir_entry *retdent, __u32 start)
1193 {
1194         __u32 curclust = (startsect - mydata->data_begin) / mydata->clust_size;
1195         __u32 find_curclust = curclust;
1196 #ifdef CONFIG_SUPPORT_VFAT
1197         dir_entry *find_dentptr = NULL;
1198 #endif
1199
1200         debug("get_dentfromdir: %s\n", filename);
1201
1202         while (1) {
1203                 dir_entry *dentptr;
1204
1205                 int i;
1206
1207                 if (get_cluster(mydata, curclust, get_dentfromdir_block,
1208                             mydata->clust_size * mydata->sect_size) != 0) {
1209                         printf("Error: reading directory block\n");
1210                         return NULL;
1211                 }
1212
1213                 dentptr = (dir_entry *)get_dentfromdir_block;
1214
1215                 dir_curclust = curclust;
1216
1217                 for (i = 0; i < DIRENTSPERCLUST; i++) {
1218                         char s_name[14], l_name[VFAT_MAXLEN_BYTES];
1219
1220                         l_name[0] = '\0';
1221                         if (dentptr->name[0] == DELETED_FLAG) {
1222                                 dentptr++;
1223                                 if (is_next_clust(mydata, dentptr))
1224                                         break;
1225                                 continue;
1226                         }
1227                         if ((dentptr->attr & ATTR_VOLUME)) {
1228 #ifdef CONFIG_SUPPORT_VFAT
1229                                 if ((dentptr->attr & ATTR_VFAT) &&
1230                                     (dentptr->name[0] & LAST_LONG_ENTRY_MASK)) {
1231                                         find_dentptr = dentptr;
1232                                         find_curclust = curclust;
1233                                         get_long_file_name(mydata, curclust,
1234                                                      get_dentfromdir_block,
1235                                                      &dentptr, l_name);
1236                                         debug("vfatname: |%s|\n", l_name);
1237                                 } else
1238 #endif
1239                                 {
1240                                         /* Volume label or VFAT entry */
1241                                         dentptr++;
1242                                         if (is_next_clust(mydata, dentptr))
1243                                                 break;
1244                                         continue;
1245                                 }
1246                         }
1247                         if (dentptr->name[0] == 0) {
1248                                 debug("Dentname == NULL - %d\n", i);
1249                                 empty_dentptr = dentptr;
1250                                 return NULL;
1251                         }
1252
1253                         get_name(dentptr, s_name);
1254
1255                         if (strcmp(filename, s_name)
1256                             && strcmp(filename, l_name)) {
1257                                 debug("Mismatch: |%s|%s|\n",
1258                                         s_name, l_name);
1259                                 dentptr++;
1260                                 if (is_next_clust(mydata, dentptr))
1261                                         break;
1262                                 continue;
1263                         }
1264
1265                         memcpy(retdent, dentptr, sizeof(dir_entry));
1266 #ifdef CONFIG_SUPPORT_VFAT
1267                         delete_long_file_name(mydata, find_curclust,
1268                                         get_dentfromdir_block,
1269                                         &find_dentptr);
1270 #else
1271                         dentptr->name[0] = DELETED_FLAG;
1272 #endif
1273                         if (set_cluster(mydata, dir_curclust,
1274                                                 get_dentfromdir_block,
1275                                                 mydata->clust_size * mydata->sect_size) != 0) {
1276                                 printf("error: wrinting directory entry\n");
1277                                 return NULL;
1278                         }
1279                         debug("DentName: %s", s_name);
1280                         debug(", start: 0x%x", START(dentptr));
1281                         debug(", size:  0x%x %s\n",
1282                               FAT2CPU32(dentptr->size),
1283                               (dentptr->attr & ATTR_DIR) ?
1284                               "(DIR)" : "");
1285
1286                         return dentptr;
1287                 }
1288
1289                 curclust = get_fatent_value(mydata, dir_curclust);
1290                 if ((curclust >= 0xffffff8) || (curclust >= 0xfff8)) {
1291                         empty_dentptr = dentptr;
1292                         return NULL;
1293                 }
1294                 if (CHECK_CLUST(curclust, mydata->fatsize)) {
1295                         debug("curclust: 0x%x\n", curclust);
1296                         debug("Invalid FAT entry\n");
1297                         return NULL;
1298                 }
1299         }
1300
1301         return NULL;
1302 }
1303
1304 static int do_fat_rm(const char *filename)
1305 {
1306         dir_entry *dentptr, *retdent;
1307         __u32 startsect;
1308         __u32 start_cluster;
1309         boot_sector bs;
1310         volume_info volinfo;
1311         fsdata datablock;
1312         fsdata *mydata = &datablock;
1313         int cursect;
1314         int ret = -1, name_len;
1315         char l_filename[VFAT_MAXLEN_BYTES];
1316
1317         dir_curclust = 0;
1318
1319         if (read_bootsectandvi(&bs, &volinfo, &mydata->fatsize)) {
1320                 debug("error: reading boot sector\n");
1321                 return -1;
1322         }
1323
1324         total_sector = bs.total_sect;
1325         if (total_sector == 0)
1326                 total_sector = cur_part_info.size;
1327
1328         if (mydata->fatsize == 32)
1329                 mydata->fatlength = bs.fat32_length;
1330         else
1331                 mydata->fatlength = bs.fat_length;
1332
1333         mydata->fat_sect = bs.reserved;
1334
1335         cursect = mydata->rootdir_sect
1336                 = mydata->fat_sect + mydata->fatlength * bs.fats;
1337         num_of_fats = bs.fats;
1338
1339         mydata->sect_size = (bs.sector_size[1] << 8) + bs.sector_size[0];
1340         mydata->clust_size = bs.cluster_size;
1341
1342         if (mydata->fatsize == 32) {
1343                 mydata->data_begin = mydata->rootdir_sect -
1344                                         (mydata->clust_size * 2);
1345         } else {
1346                 int rootdir_size;
1347
1348                 rootdir_size = ((bs.dir_entries[1]  * (int)256 +
1349                                  bs.dir_entries[0]) *
1350                                  sizeof(dir_entry)) /
1351                                  mydata->sect_size;
1352                 mydata->data_begin = mydata->rootdir_sect +
1353                                         rootdir_size -
1354                                         (mydata->clust_size * 2);
1355         }
1356
1357         mydata->fatbufnum = -1;
1358         mydata->fatbuf = malloc(FATBUFSIZE);
1359         if (mydata->fatbuf == NULL) {
1360                 debug("Error: allocating memory\n");
1361                 return -1;
1362         }
1363
1364         if (disk_read(cursect,
1365                 (mydata->fatsize == 32) ?
1366                 (mydata->clust_size) :
1367                 PREFETCH_BLOCKS, do_fat_read_block) < 0) {
1368                 debug("Error: reading rootdir block\n");
1369                 goto exit;
1370         }
1371         dentptr = (dir_entry *) do_fat_read_block;
1372
1373         name_len = strlen(filename);
1374         if (name_len >= VFAT_MAXLEN_BYTES)
1375                 name_len = VFAT_MAXLEN_BYTES - 1;
1376
1377         memcpy(l_filename, filename, name_len);
1378         l_filename[name_len] = 0; /* terminate the string */
1379         downcase(l_filename);
1380
1381         startsect = mydata->rootdir_sect;
1382         retdent = delete_directory_entry(mydata, startsect,
1383                                 l_filename, dentptr, 0);
1384
1385         if (retdent) {
1386                 /* Update file size and start_cluster in a directory entry */
1387                 start_cluster = FAT2CPU16(retdent->start);
1388                 if (mydata->fatsize == 32)
1389                         start_cluster |=
1390                                 (FAT2CPU16(retdent->starthi) << 16);
1391
1392                 ret = delete_fatent(mydata, start_cluster);
1393                 if (ret) {
1394                         printf("Error: clearing FAT entries\n");
1395                         goto exit;
1396                 }
1397
1398                 /* Write directory table to device */
1399                 ret = set_cluster(mydata, dir_curclust,
1400                             get_dentfromdir_block,
1401                             mydata->clust_size * mydata->sect_size);
1402                 if (ret) {
1403                         printf("Error: writing directory entry\n");
1404                         goto exit;
1405                 }
1406         } else {
1407                 printf("Error: %s not found\n", filename);
1408                 goto exit;
1409         }
1410
1411 exit:
1412         free(mydata->fatbuf);
1413         return ret < 0 ? ret : 0;
1414 }
1415
1416 int file_fat_rm(const char *filename)
1417 {
1418         printf("deleting %s\n", filename);
1419         return do_fat_rm(filename);
1420 }