fs/fat/prince-fat/fat-2.6.17/dir.c

   1 /*
   2  *  linux/fs/fat/dir.c
   3  *
   4  *  directory handling functions for fat-based filesystems
   5  *
   6  *  Written 1992,1993 by Werner Almesberger
   7  *
   8  *  Hidden files 1995 by Albert Cahalan <albert@ccs.neu.edu> <adc@coe.neu.edu>
   9  *
  10  *  VFAT extensions by Gordon Chaffee <chaffee@plateau.cs.berkeley.edu>
  11  *  Merged with msdos fs by Henrik Storner <storner@osiris.ping.dk>
  12  *  Rewritten for constant inumbers. Plugged buffer overrun in readdir(). AV
  13  *  Short name translation 1999, 2001 by Wolfram Pienkoss <wp@bszh.de>
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/slab.h>
  18 #include <linux/time.h>
  19 #include <linux/msdos_fs.h>
  20 #include <linux/dirent.h>
  21 #include <linux/smp_lock.h>
  22 #include <linux/buffer_head.h>
  23 #include <asm/uaccess.h>
  24
  25 static inline loff_t fat_make_i_pos(struct super_block *sb,
  26                                     struct buffer_head *bh,
  27                                     struct msdos_dir_entry *de)
  28 {
  29         return ((loff_t)bh->b_blocknr << MSDOS_SB(sb)->dir_per_block_bits)
  30                 | (de - (struct msdos_dir_entry *)bh->b_data);
  31 }
  32
  33 static inline void fat_dir_readahead(struct inode *dir, sector_t iblock,
  34                                      sector_t phys)
  35 {
  36         struct super_block *sb = dir->i_sb;
  37         struct msdos_sb_info *sbi = MSDOS_SB(sb);
  38         struct buffer_head *bh;
  39         int sec;
  40
  41         /* This is not a first sector of cluster, or sec_per_clus == 1 */
  42         if ((iblock & (sbi->sec_per_clus - 1)) || sbi->sec_per_clus == 1)
  43                 return;
  44         /* root dir of FAT12/FAT16 */
  45         if ((sbi->fat_bits != 32) && (dir->i_ino == MSDOS_ROOT_INO))
  46                 return;
  47
  48         bh = sb_find_get_block(sb, phys);
  49         if (bh == NULL || !buffer_uptodate(bh)) {
  50                 for (sec = 0; sec < sbi->sec_per_clus; sec++)
  51                         sb_breadahead(sb, phys + sec);
  52         }
  53         brelse(bh);
  54 }
  55
  56 /* Returns the inode number of the directory entry at offset pos. If bh is
  57    non-NULL, it is brelse'd before. Pos is incremented. The buffer header is
  58    returned in bh.
  59    AV. Most often we do it item-by-item. Makes sense to optimize.
  60    AV. OK, there we go: if both bh and de are non-NULL we assume that we just
  61    AV. want the next entry (took one explicit de=NULL in vfat/namei.c).
  62    AV. It's done in fat_get_entry() (inlined), here the slow case lives.
  63    AV. Additionally, when we return -1 (i.e. reached the end of directory)
  64    AV. we make bh NULL.
  65  */
  66 static int fat__get_entry(struct inode *dir, loff_t *pos,
  67                           struct buffer_head **bh, struct msdos_dir_entry **de)
  68 {
  69         struct super_block *sb = dir->i_sb;
  70         sector_t phys, iblock;
  71         unsigned long mapped_blocks;
  72         int err, offset;
  73
  74 next:
  75         if (*bh)
  76                 brelse(*bh);
  77
  78         *bh = NULL;
  79         iblock = *pos >> sb->s_blocksize_bits;
  80         err = fat_bmap(dir, iblock, &phys, &mapped_blocks);
  81         if (err || !phys)
  82                 return -1;      /* beyond EOF or error */
  83
  84         fat_dir_readahead(dir, iblock, phys);
  85
  86         *bh = sb_bread(sb, phys);
  87         if (*bh == NULL) {
  88                 printk(KERN_ERR "FAT: Directory bread(block %llu) failed\n",
  89                        (unsigned long long)phys);
  90                 /* skip this block */
  91                 *pos = (iblock + 1) << sb->s_blocksize_bits;
  92                 goto next;
  93         }
  94
  95         offset = *pos & (sb->s_blocksize - 1);
  96         *pos += sizeof(struct msdos_dir_entry);
  97         *de = (struct msdos_dir_entry *)((*bh)->b_data + offset);
  98
  99         return 0;
 100 }
 101
 102 static inline int fat_get_entry(struct inode *dir, loff_t *pos,
 103                                 struct buffer_head **bh,
 104                                 struct msdos_dir_entry **de)
 105 {
 106         /* Fast stuff first */
 107         if (*bh && *de &&
 108             (*de - (struct msdos_dir_entry *)(*bh)->b_data) < MSDOS_SB(dir->i_sb)->dir_per_block - 1) {
 109                 *pos += sizeof(struct msdos_dir_entry);
 110                 (*de)++;
 111                 return 0;
 112         }
 113         return fat__get_entry(dir, pos, bh, de);
 114 }
 115
 116 /*
 117  * Convert Unicode 16 to UTF-8, translated Unicode, or ASCII.
 118  * If uni_xlate is enabled and we can't get a 1:1 conversion, use a
 119  * colon as an escape character since it is normally invalid on the vfat
 120  * filesystem. The following four characters are the hexadecimal digits
 121  * of Unicode value. This lets us do a full dump and restore of Unicode
 122  * filenames. We could get into some trouble with long Unicode names,
 123  * but ignore that right now.
 124  * Ahem... Stack smashing in ring 0 isn't fun. Fixed.
 125  */
 126 static int uni16_to_x8(unsigned char *ascii, wchar_t *uni, int uni_xlate,
 127                        struct nls_table *nls)
 128 {
 129         wchar_t *ip, ec;
 130         unsigned char *op, nc;
 131         int charlen;
 132         int k;
 133
 134         ip = uni;
 135         op = ascii;
 136
 137         while (*ip) {
 138                 ec = *ip++;
 139                 if ( (charlen = nls->uni2char(ec, op, NLS_MAX_CHARSET_SIZE)) > 0) {
 140                         op += charlen;
 141                 } else {
 142                         if (uni_xlate == 1) {
 143                                 *op = ':';
 144                                 for (k = 4; k > 0; k--) {
 145                                         nc = ec & 0xF;
 146                                         op[k] = nc > 9  ? nc + ('a' - 10)
 147                                                         : nc + '0';
 148                                         ec >>= 4;
 149                                 }
 150                                 op += 5;
 151                         } else {
 152                                 *op++ = '?';
 153                         }
 154                 }
 155                 /* We have some slack there, so it's OK */
 156                 if (op>ascii+256) {
 157                         op = ascii + 256;
 158                         break;
 159                 }
 160         }
 161         *op = 0;
 162         return (op - ascii);
 163 }
 164
 165 static inline int
 166 fat_short2uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *uni)
 167 {
 168         int charlen;
 169
 170         charlen = t->char2uni(c, clen, uni);
 171         if (charlen < 0) {
 172                 *uni = 0x003f;  /* a question mark */
 173                 charlen = 1;
 174         }
 175         return charlen;
 176 }
 177
 178 static inline int
 179 fat_short2lower_uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *uni)
 180 {
 181         int charlen;
 182         wchar_t wc;
 183
 184         charlen = t->char2uni(c, clen, &wc);
 185         if (charlen < 0) {
 186                 *uni = 0x003f;  /* a question mark */
 187                 charlen = 1;
 188         } else if (charlen <= 1) {
 189                 unsigned char nc = t->charset2lower[*c];
 190
 191                 if (!nc)
 192                         nc = *c;
 193
 194                 if ( (charlen = t->char2uni(&nc, 1, uni)) < 0) {
 195                         *uni = 0x003f;  /* a question mark */
 196                         charlen = 1;
 197                 }
 198         } else
 199                 *uni = wc;
 200
 201         return charlen;
 202 }
 203
 204 static inline int
 205 fat_shortname2uni(struct nls_table *nls, unsigned char *buf, int buf_size,
 206                   wchar_t *uni_buf, unsigned short opt, int lower)
 207 {
 208         int len = 0;
 209
 210         if (opt & VFAT_SFN_DISPLAY_LOWER)
 211                 len =  fat_short2lower_uni(nls, buf, buf_size, uni_buf);
 212         else if (opt & VFAT_SFN_DISPLAY_WIN95)
 213                 len = fat_short2uni(nls, buf, buf_size, uni_buf);
 214         else if (opt & VFAT_SFN_DISPLAY_WINNT) {
 215                 if (lower)
 216                         len = fat_short2lower_uni(nls, buf, buf_size, uni_buf);
 217                 else
 218                         len = fat_short2uni(nls, buf, buf_size, uni_buf);
 219         } else
 220                 len = fat_short2uni(nls, buf, buf_size, uni_buf);
 221
 222         return len;
 223 }
 224
 225 enum { PARSE_INVALID = 1, PARSE_NOT_LONGNAME, PARSE_EOF, };
 226
 227 /**
 228  * fat_parse_long - Parse extended directory entry.
 229  *
 230  * This function returns zero on success, negative value on error, or one of
 231  * the following:
 232  *
 233  * %PARSE_INVALID - Directory entry is invalid.
 234  * %PARSE_NOT_LONGNAME - Directory entry does not contain longname.
 235  * %PARSE_EOF - Directory has no more entries.
 236  */
 237 static int fat_parse_long(struct inode *dir, loff_t *pos,
 238                           struct buffer_head **bh, struct msdos_dir_entry **de,
 239                           wchar_t **unicode, unsigned char *nr_slots)
 240 {
 241         struct msdos_dir_slot *ds;
 242         unsigned char id, slot, slots, alias_checksum;
 243
 244         if (!*unicode) {
 245                 *unicode = (wchar_t *)__get_free_page(GFP_KERNEL);
 246                 if (!*unicode) {
 247                         brelse(*bh);
 248                         return -ENOMEM;
 249                 }
 250         }
 251 parse_long:
 252         slots = 0;
 253         ds = (struct msdos_dir_slot *)*de;
 254         id = ds->id;
 255         if (!(id & 0x40))
 256                 return PARSE_INVALID;
 257         slots = id & ~0x40;
 258         if (slots > 20 || !slots)       /* ceil(256 * 2 / 26) */
 259                 return PARSE_INVALID;
 260         *nr_slots = slots;
 261         alias_checksum = ds->alias_checksum;
 262
 263         slot = slots;
 264         while (1) {
 265                 int offset;
 266
 267                 slot--;
 268                 offset = slot * 13;
 269                 fat16_towchar(*unicode + offset, ds->name0_4, 5);
 270                 fat16_towchar(*unicode + offset + 5, ds->name5_10, 6);
 271                 fat16_towchar(*unicode + offset + 11, ds->name11_12, 2);
 272
 273                 if (ds->id & 0x40)
 274                         (*unicode)[offset + 13] = 0;
 275                 if (fat_get_entry(dir, pos, bh, de) < 0)
 276                         return PARSE_EOF;
 277                 if (slot == 0)
 278                         break;
 279                 ds = (struct msdos_dir_slot *)*de;
 280                 if (ds->attr != ATTR_EXT)
 281                         return PARSE_NOT_LONGNAME;
 282                 if ((ds->id & ~0x40) != slot)
 283                         goto parse_long;
 284                 if (ds->alias_checksum != alias_checksum)
 285                         goto parse_long;
 286         }
 287         if ((*de)->name[0] == DELETED_FLAG)
 288                 return PARSE_INVALID;
 289         if ((*de)->attr == ATTR_EXT)
 290                 goto parse_long;
 291         if (IS_FREE((*de)->name) || ((*de)->attr & ATTR_VOLUME))
 292                 return PARSE_INVALID;
 293         if (fat_checksum((*de)->name) != alias_checksum)
 294                 *nr_slots = 0;
 295
 296         return 0;
 297 }
 298
 299 /*
 300  * Return values: negative -> error, 0 -> not found, positive -> found,
 301  * value is the total amount of slots, including the shortname entry.
 302  */
 303 int fat_search_long(struct inode *inode, const unsigned char *name,
 304                     int name_len, struct fat_slot_info *sinfo)
 305 {
 306         struct super_block *sb = inode->i_sb;
 307         struct msdos_sb_info *sbi = MSDOS_SB(sb);
 308         struct buffer_head *bh = NULL;
 309         struct msdos_dir_entry *de;
 310         struct nls_table *nls_io = sbi->nls_io;
 311         struct nls_table *nls_disk = sbi->nls_disk;
 312         wchar_t bufuname[14];
 313         unsigned char xlate_len, nr_slots;
 314         wchar_t *unicode = NULL;
 315         unsigned char work[8], bufname[260];    /* 256 + 4 */
 316         int uni_xlate = sbi->options.unicode_xlate;
 317         int utf8 = sbi->options.utf8;
 318         int anycase = (sbi->options.name_check != 's');
 319         unsigned short opt_shortname = sbi->options.shortname;
 320         loff_t cpos = 0;
 321         int chl, i, j, last_u, err;
 322
 323         err = -ENOENT;
 324         while(1) {
 325                 if (fat_get_entry(inode, &cpos, &bh, &de) == -1)
 326                         goto EODir;
 327 parse_record:
 328                 nr_slots = 0;
 329                 if (de->name[0] == DELETED_FLAG)
 330                         continue;
 331                 if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME))
 332                         continue;
 333                 if (de->attr != ATTR_EXT && IS_FREE(de->name))
 334                         continue;
 335                 if (de->attr == ATTR_EXT) {
 336                         int status = fat_parse_long(inode, &cpos, &bh, &de,
 337                                                     &unicode, &nr_slots);
 338                         if (status < 0)
 339                                 return status;
 340                         else if (status == PARSE_INVALID)
 341                                 continue;
 342                         else if (status == PARSE_NOT_LONGNAME)
 343                                 goto parse_record;
 344                         else if (status == PARSE_EOF)
 345                                 goto EODir;
 346                 }
 347
 348                 memcpy(work, de->name, sizeof(de->name));
 349                 /* see namei.c, msdos_format_name */
 350                 if (work[0] == 0x05)
 351                         work[0] = 0xE5;
 352                 for (i = 0, j = 0, last_u = 0; i < 8;) {
 353                         if (!work[i]) break;
 354                         chl = fat_shortname2uni(nls_disk, &work[i], 8 - i,
 355                                                 &bufuname[j++], opt_shortname,
 356                                                 de->lcase & CASE_LOWER_BASE);
 357                         if (chl <= 1) {
 358                                 if (work[i] != ' ')
 359                                         last_u = j;
 360                         } else {
 361                                 last_u = j;
 362                         }
 363                         i += chl;
 364                 }
 365                 j = last_u;
 366                 fat_short2uni(nls_disk, ".", 1, &bufuname[j++]);
 367                 for (i = 0; i < 3;) {
 368                         if (!de->ext[i]) break;
 369                         chl = fat_shortname2uni(nls_disk, &de->ext[i], 3 - i,
 370                                                 &bufuname[j++], opt_shortname,
 371                                                 de->lcase & CASE_LOWER_EXT);
 372                         if (chl <= 1) {
 373                                 if (de->ext[i] != ' ')
 374                                         last_u = j;
 375                         } else {
 376                                 last_u = j;
 377                         }
 378                         i += chl;
 379                 }
 380                 if (!last_u)
 381                         continue;
 382
 383                 bufuname[last_u] = 0x0000;
 384                 xlate_len = utf8
 385                         ?utf8_wcstombs(bufname, bufuname, sizeof(bufname))
 386                         :uni16_to_x8(bufname, bufuname, uni_xlate, nls_io);
 387                 if (xlate_len == name_len)
 388                         if ((!anycase && !memcmp(name, bufname, xlate_len)) ||
 389                             (anycase && !nls_strnicmp(nls_io, name, bufname,
 390                                                                 xlate_len)))
 391                                 goto Found;
 392
 393                 if (nr_slots) {
 394                         xlate_len = utf8
 395                                 ?utf8_wcstombs(bufname, unicode, sizeof(bufname))
 396                                 :uni16_to_x8(bufname, unicode, uni_xlate, nls_io);
 397                         if (xlate_len != name_len)
 398                                 continue;
 399                         if ((!anycase && !memcmp(name, bufname, xlate_len)) ||
 400                             (anycase && !nls_strnicmp(nls_io, name, bufname,
 401                                                                 xlate_len)))
 402                                 goto Found;
 403                 }
 404         }
 405
 406 Found:
 407         nr_slots++;     /* include the de */
 408         sinfo->slot_off = cpos - nr_slots * sizeof(*de);
 409         sinfo->nr_slots = nr_slots;
 410         sinfo->de = de;
 411         sinfo->bh = bh;
 412         sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de);
 413         err = 0;
 414 EODir:
 415         if (unicode)
 416                 free_page((unsigned long)unicode);
 417
 418         return err;
 419 }
 420
 421 EXPORT_SYMBOL_GPL(fat_search_long);
 422
 423 struct fat_ioctl_filldir_callback {
 424         struct dirent __user *dirent;
 425         int result;
 426         /* for dir ioctl */
 427         const char *longname;
 428         int long_len;
 429         const char *shortname;
 430         int short_len;
 431 };
 432
 433 static int __fat_readdir(struct inode *inode, struct file *filp, void *dirent,
 434                          filldir_t filldir, int short_only, int both)
 435 {
 436         struct super_block *sb = inode->i_sb;
 437         struct msdos_sb_info *sbi = MSDOS_SB(sb);
 438         struct buffer_head *bh;
 439         struct msdos_dir_entry *de;
 440         struct nls_table *nls_io = sbi->nls_io;
 441         struct nls_table *nls_disk = sbi->nls_disk;
 442         unsigned char long_slots;
 443         const char *fill_name;
 444         int fill_len;
 445         wchar_t bufuname[14];
 446         wchar_t *unicode = NULL;
 447         unsigned char c, work[8], bufname[56], *ptname = bufname;
 448         unsigned long lpos, dummy, *furrfu = &lpos;
 449         int uni_xlate = sbi->options.unicode_xlate;
 450         int isvfat = sbi->options.isvfat;
 451         int utf8 = sbi->options.utf8;
 452         int nocase = sbi->options.nocase;
 453         unsigned short opt_shortname = sbi->options.shortname;
 454         unsigned long inum;
 455         int chi, chl, i, i2, j, last, last_u, dotoffset = 0;
 456         loff_t cpos;
 457         int ret = 0;
 458
 459         lock_kernel();
 460
 461         cpos = filp->f_pos;
 462         /* Fake . and .. for the root directory. */
 463         if (inode->i_ino == MSDOS_ROOT_INO) {
 464                 while (cpos < 2) {
 465                         if (filldir(dirent, "..", cpos+1, cpos, MSDOS_ROOT_INO, DT_DIR) < 0)
 466                                 goto out;
 467                         cpos++;
 468                         filp->f_pos++;
 469                 }
 470                 if (cpos == 2) {
 471                         dummy = 2;
 472                         furrfu = &dummy;
 473                         cpos = 0;
 474                 }
 475         }
 476         if (cpos & (sizeof(struct msdos_dir_entry)-1)) {
 477                 ret = -ENOENT;
 478                 goto out;
 479         }
 480
 481         bh = NULL;
 482 GetNew:
 483         if (fat_get_entry(inode, &cpos, &bh, &de) == -1)
 484                 goto EODir;
 485 parse_record:
 486         long_slots = 0;
 487         /* Check for long filename entry */
 488         if (isvfat) {
 489                 if (de->name[0] == DELETED_FLAG)
 490                         goto RecEnd;
 491                 if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME))
 492                         goto RecEnd;
 493                 if (de->attr != ATTR_EXT && IS_FREE(de->name))
 494                         goto RecEnd;
 495         } else {
 496                 if ((de->attr & ATTR_VOLUME) || IS_FREE(de->name))
 497                         goto RecEnd;
 498         }
 499
 500         if (isvfat && de->attr == ATTR_EXT) {
 501                 int status = fat_parse_long(inode, &cpos, &bh, &de,
 502                                             &unicode, &long_slots);
 503                 if (status < 0) {
 504                         filp->f_pos = cpos;
 505                         ret = status;
 506                         goto out;
 507                 } else if (status == PARSE_INVALID)
 508                         goto RecEnd;
 509                 else if (status == PARSE_NOT_LONGNAME)
 510                         goto parse_record;
 511                 else if (status == PARSE_EOF)
 512                         goto EODir;
 513         }
 514
 515         if (sbi->options.dotsOK) {
 516                 ptname = bufname;
 517                 dotoffset = 0;
 518                 if (de->attr & ATTR_HIDDEN) {
 519                         *ptname++ = '.';
 520                         dotoffset = 1;
 521                 }
 522         }
 523
 524         memcpy(work, de->name, sizeof(de->name));
 525         /* see namei.c, msdos_format_name */
 526         if (work[0] == 0x05)
 527                 work[0] = 0xE5;
 528         for (i = 0, j = 0, last = 0, last_u = 0; i < 8;) {
 529                 if (!(c = work[i])) break;
 530                 chl = fat_shortname2uni(nls_disk, &work[i], 8 - i,
 531                                         &bufuname[j++], opt_shortname,
 532                                         de->lcase & CASE_LOWER_BASE);
 533                 if (chl <= 1) {
 534                         ptname[i++] = (!nocase && c>='A' && c<='Z') ? c+32 : c;
 535                         if (c != ' ') {
 536                                 last = i;
 537                                 last_u = j;
 538                         }
 539                 } else {
 540                         last_u = j;
 541                         for (chi = 0; chi < chl && i < 8; chi++) {
 542                                 ptname[i] = work[i];
 543                                 i++; last = i;
 544                         }
 545                 }
 546         }
 547         i = last;
 548         j = last_u;
 549         fat_short2uni(nls_disk, ".", 1, &bufuname[j++]);
 550         ptname[i++] = '.';
 551         for (i2 = 0; i2 < 3;) {
 552                 if (!(c = de->ext[i2])) break;
 553                 chl = fat_shortname2uni(nls_disk, &de->ext[i2], 3 - i2,
 554                                         &bufuname[j++], opt_shortname,
 555                                         de->lcase & CASE_LOWER_EXT);
 556                 if (chl <= 1) {
 557                         i2++;
 558                         ptname[i++] = (!nocase && c>='A' && c<='Z') ? c+32 : c;
 559                         if (c != ' ') {
 560                                 last = i;
 561                                 last_u = j;
 562                         }
 563                 } else {
 564                         last_u = j;
 565                         for (chi = 0; chi < chl && i2 < 3; chi++) {
 566                                 ptname[i++] = de->ext[i2++];
 567                                 last = i;
 568                         }
 569                 }
 570         }
 571         if (!last)
 572                 goto RecEnd;
 573
 574         i = last + dotoffset;
 575         j = last_u;
 576
 577         lpos = cpos - (long_slots+1)*sizeof(struct msdos_dir_entry);
 578         if (!memcmp(de->name, MSDOS_DOT, MSDOS_NAME))
 579                 inum = inode->i_ino;
 580         else if (!memcmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) {
 581                 inum = parent_ino(filp->f_dentry);
 582         } else {
 583                 loff_t i_pos = fat_make_i_pos(sb, bh, de);
 584                 struct inode *tmp = fat_iget(sb, i_pos);
 585                 if (tmp) {
 586                         inum = tmp->i_ino;
 587                         iput(tmp);
 588                 } else
 589                         inum = iunique(sb, MSDOS_ROOT_INO);
 590         }
 591
 592         if (isvfat) {
 593                 bufuname[j] = 0x0000;
 594                 i = utf8 ? utf8_wcstombs(bufname, bufuname, sizeof(bufname))
 595                          : uni16_to_x8(bufname, bufuname, uni_xlate, nls_io);
 596         }
 597
 598         fill_name = bufname;
 599         fill_len = i;
 600         if (!short_only && long_slots) {
 601                 /* convert the unicode long name. 261 is maximum size
 602                  * of unicode buffer. (13 * slots + nul) */
 603                 void *longname = unicode + 261;
 604                 int buf_size = PAGE_SIZE - (261 * sizeof(unicode[0]));
 605                 int long_len = utf8
 606                         ? utf8_wcstombs(longname, unicode, buf_size)
 607                         : uni16_to_x8(longname, unicode, uni_xlate, nls_io);
 608
 609                 if (!both) {
 610                         fill_name = longname;
 611                         fill_len = long_len;
 612                 } else {
 613                         /* hack for fat_ioctl_filldir() */
 614                         struct fat_ioctl_filldir_callback *p = dirent;
 615
 616                         p->longname = longname;
 617                         p->long_len = long_len;
 618                         p->shortname = bufname;
 619                         p->short_len = i;
 620                         fill_name = NULL;
 621                         fill_len = 0;
 622                 }
 623         }
 624         if (filldir(dirent, fill_name, fill_len, *furrfu, inum,
 625                     (de->attr & ATTR_DIR) ? DT_DIR : DT_REG) < 0)
 626                 goto FillFailed;
 627
 628 RecEnd:
 629         furrfu = &lpos;
 630         filp->f_pos = cpos;
 631         goto GetNew;
 632 EODir:
 633         filp->f_pos = cpos;
 634 FillFailed:
 635         brelse(bh);
 636         if (unicode)
 637                 free_page((unsigned long)unicode);
 638 out:
 639         unlock_kernel();
 640         return ret;
 641 }
 642
 643 static int fat_readdir(struct file *filp, void *dirent, filldir_t filldir)
 644 {
 645         struct inode *inode = filp->f_dentry->d_inode;
 646         return __fat_readdir(inode, filp, dirent, filldir, 0, 0);
 647 }
 648
 649 static int fat_ioctl_filldir(void *__buf, const char *name, int name_len,
 650                              loff_t offset, ino_t ino, unsigned int d_type)
 651 {
 652         struct fat_ioctl_filldir_callback *buf = __buf;
 653         struct dirent __user *d1 = buf->dirent;
 654         struct dirent __user *d2 = d1 + 1;
 655
 656         if (buf->result)
 657                 return -EINVAL;
 658         buf->result++;
 659
 660         if (name != NULL) {
 661                 /* dirent has only short name */
 662                 if (name_len >= sizeof(d1->d_name))
 663                         name_len = sizeof(d1->d_name) - 1;
 664
 665                 if (put_user(0, d2->d_name)                     ||
 666                     put_user(0, &d2->d_reclen)                  ||
 667                     copy_to_user(d1->d_name, name, name_len)    ||
 668                     put_user(0, d1->d_name + name_len)          ||
 669                     put_user(name_len, &d1->d_reclen))
 670                         goto efault;
 671         } else {
 672                 /* dirent has short and long name */
 673                 const char *longname = buf->longname;
 674                 int long_len = buf->long_len;
 675                 const char *shortname = buf->shortname;
 676                 int short_len = buf->short_len;
 677
 678                 if (long_len >= sizeof(d1->d_name))
 679                         long_len = sizeof(d1->d_name) - 1;
 680                 if (short_len >= sizeof(d1->d_name))
 681                         short_len = sizeof(d1->d_name) - 1;
 682
 683                 if (copy_to_user(d2->d_name, longname, long_len)        ||
 684                     put_user(0, d2->d_name + long_len)                  ||
 685                     put_user(long_len, &d2->d_reclen)                   ||
 686                     put_user(ino, &d2->d_ino)                           ||
 687                     put_user(offset, &d2->d_off)                        ||
 688                     copy_to_user(d1->d_name, shortname, short_len)      ||
 689                     put_user(0, d1->d_name + short_len)                 ||
 690                     put_user(short_len, &d1->d_reclen))
 691                         goto efault;
 692         }
 693         return 0;
 694 efault:
 695         buf->result = -EFAULT;
 696         return -EFAULT;
 697 }
 698
 699 static int fat_dir_ioctl(struct inode * inode, struct file * filp,
 700                   unsigned int cmd, unsigned long arg)
 701 {
 702         struct fat_ioctl_filldir_callback buf;
 703         struct dirent __user *d1;
 704         int ret, short_only, both;
 705
 706         switch (cmd) {
 707         case VFAT_IOCTL_READDIR_SHORT:
 708                 short_only = 1;
 709                 both = 0;
 710                 break;
 711         case VFAT_IOCTL_READDIR_BOTH:
 712                 short_only = 0;
 713                 both = 1;
 714                 break;
 715         default:
 716                 return fat_generic_ioctl(inode, filp, cmd, arg);
 717         }
 718
 719         d1 = (struct dirent __user *)arg;
 720         if (!access_ok(VERIFY_WRITE, d1, sizeof(struct dirent[2])))
 721                 return -EFAULT;
 722         /*
 723          * Yes, we don't need this put_user() absolutely. However old
 724          * code didn't return the right value. So, app use this value,
 725          * in order to check whether it is EOF.
 726          */
 727         if (put_user(0, &d1->d_reclen))
 728                 return -EFAULT;
 729
 730         buf.dirent = d1;
 731         buf.result = 0;
 732         mutex_lock(&inode->i_mutex);
 733         ret = -ENOENT;
 734         if (!IS_DEADDIR(inode)) {
 735                 ret = __fat_readdir(inode, filp, &buf, fat_ioctl_filldir,
 736                                     short_only, both);
 737         }
 738         mutex_unlock(&inode->i_mutex);
 739         if (ret >= 0)
 740                 ret = buf.result;
 741         return ret;
 742 }
 743
 744 const struct file_operations fat_dir_operations = {
 745         .read           = generic_read_dir,
 746         .readdir        = fat_readdir,
 747         .ioctl          = fat_dir_ioctl,
 748         .fsync          = file_fsync,
 749 };
 750
 751 static int fat_get_short_entry(struct inode *dir, loff_t *pos,
 752                                struct buffer_head **bh,
 753                                struct msdos_dir_entry **de)
 754 {
 755         while (fat_get_entry(dir, pos, bh, de) >= 0) {
 756                 /* free entry or long name entry or volume label */
 757                 if (!IS_FREE((*de)->name) && !((*de)->attr & ATTR_VOLUME))
 758                         return 0;
 759         }
 760         return -ENOENT;
 761 }
 762
 763 /*
 764  * The ".." entry can not provide the "struct fat_slot_info" informations
 765  * for inode. So, this function provide the some informations only.
 766  */
 767 int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh,
 768                          struct msdos_dir_entry **de, loff_t *i_pos)
 769 {
 770         loff_t offset;
 771
 772         offset = 0;
 773         *bh = NULL;
 774         while (fat_get_short_entry(dir, &offset, bh, de) >= 0) {
 775                 if (!strncmp((*de)->name, MSDOS_DOTDOT, MSDOS_NAME)) {
 776                         *i_pos = fat_make_i_pos(dir->i_sb, *bh, *de);
 777                         return 0;
 778                 }
 779         }
 780         return -ENOENT;
 781 }
 782
 783 EXPORT_SYMBOL_GPL(fat_get_dotdot_entry);
 784
 785 /* See if directory is empty */
 786 int fat_dir_empty(struct inode *dir)
 787 {
 788         struct buffer_head *bh;
 789         struct msdos_dir_entry *de;
 790         loff_t cpos;
 791         int result = 0;
 792
 793         bh = NULL;
 794         cpos = 0;
 795         while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) {
 796                 if (strncmp(de->name, MSDOS_DOT   , MSDOS_NAME) &&
 797                     strncmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) {
 798                         result = -ENOTEMPTY;
 799                         break;
 800                 }
 801         }
 802         brelse(bh);
 803         return result;
 804 }
 805
 806 EXPORT_SYMBOL_GPL(fat_dir_empty);
 807
 808 /*
 809  * fat_subdirs counts the number of sub-directories of dir. It can be run
 810  * on directories being created.
 811  */
 812 int fat_subdirs(struct inode *dir)
 813 {
 814         struct buffer_head *bh;
 815         struct msdos_dir_entry *de;
 816         loff_t cpos;
 817         int count = 0;
 818
 819         bh = NULL;
 820         cpos = 0;
 821         while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) {
 822                 if (de->attr & ATTR_DIR)
 823                         count++;
 824         }
 825         brelse(bh);
 826         return count;
 827 }
 828
 829 /*
 830  * Scans a directory for a given file (name points to its formatted name).
 831  * Returns an error code or zero.
 832  */
 833 int fat_scan(struct inode *dir, const unsigned char *name,
 834              struct fat_slot_info *sinfo)
 835 {
 836         struct super_block *sb = dir->i_sb;
 837
 838         sinfo->slot_off = 0;
 839         sinfo->bh = NULL;
 840         while (fat_get_short_entry(dir, &sinfo->slot_off, &sinfo->bh,
 841                                    &sinfo->de) >= 0) {
 842                 if (!strncmp(sinfo->de->name, name, MSDOS_NAME)) {
 843                         sinfo->slot_off -= sizeof(*sinfo->de);
 844                         sinfo->nr_slots = 1;
 845                         sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de);
 846                         return 0;
 847                 }
 848         }
 849         return -ENOENT;
 850 }
 851
 852 EXPORT_SYMBOL_GPL(fat_scan);
 853
 854 static int __fat_remove_entries(struct inode *dir, loff_t pos, int nr_slots)
 855 {
 856         struct super_block *sb = dir->i_sb;
 857         struct buffer_head *bh;
 858         struct msdos_dir_entry *de, *endp;
 859         int err = 0, orig_slots;
 860
 861         while (nr_slots) {
 862                 bh = NULL;
 863                 if (fat_get_entry(dir, &pos, &bh, &de) < 0) {
 864                         err = -EIO;
 865                         break;
 866                 }
 867
 868                 orig_slots = nr_slots;
 869                 endp = (struct msdos_dir_entry *)(bh->b_data + sb->s_blocksize);
 870                 while (nr_slots && de < endp) {
 871                         de->name[0] = DELETED_FLAG;
 872                         de++;
 873                         nr_slots--;
 874                 }
 875                 mark_buffer_dirty(bh);
 876                 if (IS_DIRSYNC(dir))
 877                         err = sync_dirty_buffer(bh);
 878                 brelse(bh);
 879                 if (err)
 880                         break;
 881
 882                 /* pos is *next* de's position, so this does `- sizeof(de)' */
 883                 pos += ((orig_slots - nr_slots) * sizeof(*de)) - sizeof(*de);
 884         }
 885
 886         return err;
 887 }
 888
 889 int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo)
 890 {
 891         struct msdos_dir_entry *de;
 892         struct buffer_head *bh;
 893         int err = 0, nr_slots;
 894
 895         /*
 896          * First stage: Remove the shortname. By this, the directory
 897          * entry is removed.
 898          */
 899         nr_slots = sinfo->nr_slots;
 900         de = sinfo->de;
 901         sinfo->de = NULL;
 902         bh = sinfo->bh;
 903         sinfo->bh = NULL;
 904         while (nr_slots && de >= (struct msdos_dir_entry *)bh->b_data) {
 905                 de->name[0] = DELETED_FLAG;
 906                 de--;
 907                 nr_slots--;
 908         }
 909         mark_buffer_dirty(bh);
 910         if (IS_DIRSYNC(dir))
 911                 err = sync_dirty_buffer(bh);
 912         brelse(bh);
 913         if (err)
 914                 return err;
 915         dir->i_version++;
 916
 917         if (nr_slots) {
 918                 /*
 919                  * Second stage: remove the remaining longname slots.
 920                  * (This directory entry is already removed, and so return
 921                  * the success)
 922                  */
 923                 err = __fat_remove_entries(dir, sinfo->slot_off, nr_slots);
 924                 if (err) {
 925                         printk(KERN_WARNING
 926                                "FAT: Couldn't remove the long name slots\n");
 927                 }
 928         }
 929
 930         dir->i_mtime = dir->i_atime = CURRENT_TIME_SEC;
 931         if (IS_DIRSYNC(dir))
 932                 (void)fat_sync_inode(dir);
 933         else
 934                 mark_inode_dirty(dir);
 935
 936         return 0;
 937 }
 938
 939 EXPORT_SYMBOL_GPL(fat_remove_entries);
 940
 941 static int fat_zeroed_cluster(struct inode *dir, sector_t blknr, int nr_used,
 942                               struct buffer_head **bhs, int nr_bhs)
 943 {
 944         struct super_block *sb = dir->i_sb;
 945         sector_t last_blknr = blknr + MSDOS_SB(sb)->sec_per_clus;
 946         int err, i, n;
 947
 948         /* Zeroing the unused blocks on this cluster */
 949         blknr += nr_used;
 950         n = nr_used;
 951         while (blknr < last_blknr) {
 952                 bhs[n] = sb_getblk(sb, blknr);
 953                 if (!bhs[n]) {
 954                         err = -ENOMEM;
 955                         goto error;
 956                 }
 957                 memset(bhs[n]->b_data, 0, sb->s_blocksize);
 958                 set_buffer_uptodate(bhs[n]);
 959                 mark_buffer_dirty(bhs[n]);
 960
 961                 n++;
 962                 blknr++;
 963                 if (n == nr_bhs) {
 964                         if (IS_DIRSYNC(dir)) {
 965                                 err = fat_sync_bhs(bhs, n);
 966                                 if (err)
 967                                         goto error;
 968                         }
 969                         for (i = 0; i < n; i++)
 970                                 brelse(bhs[i]);
 971                         n = 0;
 972                 }
 973         }
 974         if (IS_DIRSYNC(dir)) {
 975                 err = fat_sync_bhs(bhs, n);
 976                 if (err)
 977                         goto error;
 978         }
 979         for (i = 0; i < n; i++)
 980                 brelse(bhs[i]);
 981
 982         return 0;
 983
 984 error:
 985         for (i = 0; i < n; i++)
 986                 bforget(bhs[i]);
 987         return err;
 988 }
 989
 990 int fat_alloc_new_dir(struct inode *dir, struct timespec *ts)
 991 {
 992         struct super_block *sb = dir->i_sb;
 993         struct msdos_sb_info *sbi = MSDOS_SB(sb);
 994         struct buffer_head *bhs[MAX_BUF_PER_PAGE];
 995         struct msdos_dir_entry *de;
 996         sector_t blknr;
 997         __le16 date, time;
 998         int err, cluster;
 999
1000         err = fat_alloc_clusters(dir, &cluster, 1);
1001         if (err)
1002                 goto error;
1003
1004         blknr = fat_clus_to_blknr(sbi, cluster);
1005         bhs[0] = sb_getblk(sb, blknr);
1006         if (!bhs[0]) {
1007                 err = -ENOMEM;
1008                 goto error_free;
1009         }
1010
1011         fat_date_unix2dos(ts->tv_sec, &time, &date);
1012
1013         de = (struct msdos_dir_entry *)bhs[0]->b_data;
1014         /* filling the new directory slots ("." and ".." entries) */
1015         memcpy(de[0].name, MSDOS_DOT, MSDOS_NAME);
1016         memcpy(de[1].name, MSDOS_DOTDOT, MSDOS_NAME);
1017         de->attr = de[1].attr = ATTR_DIR;
1018         de[0].lcase = de[1].lcase = 0;
1019         de[0].time = de[1].time = time;
1020         de[0].date = de[1].date = date;
1021         de[0].ctime_cs = de[1].ctime_cs = 0;
1022         if (sbi->options.isvfat) {
1023                 /* extra timestamps */
1024                 de[0].ctime = de[1].ctime = time;
1025                 de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = date;
1026         } else {
1027                 de[0].ctime = de[1].ctime = 0;
1028                 de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = 0;
1029         }
1030         de[0].start = cpu_to_le16(cluster);
1031         de[0].starthi = cpu_to_le16(cluster >> 16);
1032         de[1].start = cpu_to_le16(MSDOS_I(dir)->i_logstart);
1033         de[1].starthi = cpu_to_le16(MSDOS_I(dir)->i_logstart >> 16);
1034         de[0].size = de[1].size = 0;
1035         memset(de + 2, 0, sb->s_blocksize - 2 * sizeof(*de));
1036         set_buffer_uptodate(bhs[0]);
1037         mark_buffer_dirty(bhs[0]);
1038
1039         err = fat_zeroed_cluster(dir, blknr, 1, bhs, MAX_BUF_PER_PAGE);
1040         if (err)
1041                 goto error_free;
1042
1043         return cluster;
1044
1045 error_free:
1046         fat_free_clusters(dir, cluster);
1047 error:
1048         return err;
1049 }
1050
1051 EXPORT_SYMBOL_GPL(fat_alloc_new_dir);
1052
1053 static int fat_add_new_entries(struct inode *dir, void *slots, int nr_slots,
1054                                int *nr_cluster, struct msdos_dir_entry **de,
1055                                struct buffer_head **bh, loff_t *i_pos)
1056 {
1057         struct super_block *sb = dir->i_sb;
1058         struct msdos_sb_info *sbi = MSDOS_SB(sb);
1059         struct buffer_head *bhs[MAX_BUF_PER_PAGE];
1060         sector_t blknr, start_blknr, last_blknr;
1061         unsigned long size, copy;
1062         int err, i, n, offset, cluster[2];
1063
1064         /*
1065          * The minimum cluster size is 512bytes, and maximum entry
1066          * size is 32*slots (672bytes).  So, iff the cluster size is
1067          * 512bytes, we may need two clusters.
1068          */
1069         size = nr_slots * sizeof(struct msdos_dir_entry);
1070         *nr_cluster = (size + (sbi->cluster_size - 1)) >> sbi->cluster_bits;
1071         BUG_ON(*nr_cluster > 2);
1072
1073         err = fat_alloc_clusters(dir, cluster, *nr_cluster);
1074         if (err)
1075                 goto error;
1076
1077         /*
1078          * First stage: Fill the directory entry.  NOTE: This cluster
1079          * is not referenced from any inode yet, so updates order is
1080          * not important.
1081          */
1082         i = n = copy = 0;
1083         do {
1084                 start_blknr = blknr = fat_clus_to_blknr(sbi, cluster[i]);
1085                 last_blknr = start_blknr + sbi->sec_per_clus;
1086                 while (blknr < last_blknr) {
1087                         bhs[n] = sb_getblk(sb, blknr);
1088                         if (!bhs[n]) {
1089                                 err = -ENOMEM;
1090                                 goto error_nomem;
1091                         }
1092
1093                         /* fill the directory entry */
1094                         copy = min(size, sb->s_blocksize);
1095                         memcpy(bhs[n]->b_data, slots, copy);
1096                         slots += copy;
1097                         size -= copy;
1098                         set_buffer_uptodate(bhs[n]);
1099                         mark_buffer_dirty(bhs[n]);
1100                         if (!size)
1101                                 break;
1102                         n++;
1103                         blknr++;
1104                 }
1105         } while (++i < *nr_cluster);
1106
1107         memset(bhs[n]->b_data + copy, 0, sb->s_blocksize - copy);
1108         offset = copy - sizeof(struct msdos_dir_entry);
1109         get_bh(bhs[n]);
1110         *bh = bhs[n];
1111         *de = (struct msdos_dir_entry *)((*bh)->b_data + offset);
1112         *i_pos = fat_make_i_pos(sb, *bh, *de);
1113
1114         /* Second stage: clear the rest of cluster, and write outs */
1115         err = fat_zeroed_cluster(dir, start_blknr, ++n, bhs, MAX_BUF_PER_PAGE);
1116         if (err)
1117                 goto error_free;
1118
1119         return cluster[0];
1120
1121 error_free:
1122         brelse(*bh);
1123         *bh = NULL;
1124         n = 0;
1125 error_nomem:
1126         for (i = 0; i < n; i++)
1127                 bforget(bhs[i]);
1128         fat_free_clusters(dir, cluster[0]);
1129 error:
1130         return err;
1131 }
1132
1133 int fat_add_entries(struct inode *dir, void *slots, int nr_slots,
1134                     struct fat_slot_info *sinfo)
1135 {
1136         struct super_block *sb = dir->i_sb;
1137         struct msdos_sb_info *sbi = MSDOS_SB(sb);
1138         struct buffer_head *bh, *prev, *bhs[3]; /* 32*slots (672bytes) */
1139         struct msdos_dir_entry *de;
1140         int err, free_slots, i, nr_bhs;
1141         loff_t pos, i_pos;
1142
1143         sinfo->nr_slots = nr_slots;
1144
1145         /* First stage: search free direcotry entries */
1146         free_slots = nr_bhs = 0;
1147         bh = prev = NULL;
1148         pos = 0;
1149         err = -ENOSPC;
1150         while (fat_get_entry(dir, &pos, &bh, &de) > -1) {
1151                 /* check the maximum size of directory */
1152                 if (pos >= FAT_MAX_DIR_SIZE)
1153                         goto error;
1154
1155                 if (IS_FREE(de->name)) {
1156                         if (prev != bh) {
1157                                 get_bh(bh);
1158                                 bhs[nr_bhs] = prev = bh;
1159                                 nr_bhs++;
1160                         }
1161                         free_slots++;
1162                         if (free_slots == nr_slots)
1163                                 goto found;
1164                 } else {
1165                         for (i = 0; i < nr_bhs; i++)
1166                                 brelse(bhs[i]);
1167                         prev = NULL;
1168                         free_slots = nr_bhs = 0;
1169                 }
1170         }
1171         if (dir->i_ino == MSDOS_ROOT_INO) {
1172                 if (sbi->fat_bits != 32)
1173                         goto error;
1174         } else if (MSDOS_I(dir)->i_start == 0) {
1175                 printk(KERN_ERR "FAT: Corrupted directory (i_pos %lld)\n",
1176                        MSDOS_I(dir)->i_pos);
1177                 err = -EIO;
1178                 goto error;
1179         }
1180
1181 found:
1182         err = 0;
1183         pos -= free_slots * sizeof(*de);
1184         nr_slots -= free_slots;
1185         if (free_slots) {
1186                 /*
1187                  * Second stage: filling the free entries with new entries.
1188                  * NOTE: If this slots has shortname, first, we write
1189                  * the long name slots, then write the short name.
1190                  */
1191                 int size = free_slots * sizeof(*de);
1192                 int offset = pos & (sb->s_blocksize - 1);
1193                 int long_bhs = nr_bhs - (nr_slots == 0);
1194
1195                 /* Fill the long name slots. */
1196                 for (i = 0; i < long_bhs; i++) {
1197                         int copy = min_t(int, sb->s_blocksize - offset, size);
1198                         memcpy(bhs[i]->b_data + offset, slots, copy);
1199                         mark_buffer_dirty(bhs[i]);
1200                         offset = 0;
1201                         slots += copy;
1202                         size -= copy;
1203                 }
1204                 if (long_bhs && IS_DIRSYNC(dir))
1205                         err = fat_sync_bhs(bhs, long_bhs);
1206                 if (!err && i < nr_bhs) {
1207                         /* Fill the short name slot. */
1208                         int copy = min_t(int, sb->s_blocksize - offset, size);
1209                         memcpy(bhs[i]->b_data + offset, slots, copy);
1210                         mark_buffer_dirty(bhs[i]);
1211                         if (IS_DIRSYNC(dir))
1212                                 err = sync_dirty_buffer(bhs[i]);
1213                 }
1214                 for (i = 0; i < nr_bhs; i++)
1215                         brelse(bhs[i]);
1216                 if (err)
1217                         goto error_remove;
1218         }
1219
1220         if (nr_slots) {
1221                 int cluster, nr_cluster;
1222
1223                 /*
1224                  * Third stage: allocate the cluster for new entries.
1225                  * And initialize the cluster with new entries, then
1226                  * add the cluster to dir.
1227                  */
1228                 cluster = fat_add_new_entries(dir, slots, nr_slots, &nr_cluster,
1229                                               &de, &bh, &i_pos);
1230                 if (cluster < 0) {
1231                         err = cluster;
1232                         goto error_remove;
1233                 }
1234                 err = fat_chain_add(dir, cluster, nr_cluster);
1235                 if (err) {
1236                         fat_free_clusters(dir, cluster);
1237                         goto error_remove;
1238                 }
1239                 if (dir->i_size & (sbi->cluster_size - 1)) {
1240                         fat_fs_panic(sb, "Odd directory size");
1241                         dir->i_size = (dir->i_size + sbi->cluster_size - 1)
1242                                 & ~((loff_t)sbi->cluster_size - 1);
1243                 }
1244                 dir->i_size += nr_cluster << sbi->cluster_bits;
1245                 MSDOS_I(dir)->mmu_private += nr_cluster << sbi->cluster_bits;
1246         }
1247         sinfo->slot_off = pos;
1248         sinfo->de = de;
1249         sinfo->bh = bh;
1250         sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de);
1251
1252         return 0;
1253
1254 error:
1255         brelse(bh);
1256         for (i = 0; i < nr_bhs; i++)
1257                 brelse(bhs[i]);
1258         return err;
1259
1260 error_remove:
1261         brelse(bh);
1262         if (free_slots)
1263                 __fat_remove_entries(dir, pos, free_slots);
1264         return err;
1265 }
1266
1267 EXPORT_SYMBOL_GPL(fat_add_entries);